:root {
    color-scheme: dark;
    --bg: #000000;
    --surface: #121217;
    --surface-2: #1c1c24;
    --surface-3: #262633;
    --line: rgba(255, 255, 255, 0.08);
    --line-strong: rgba(255, 255, 255, 0.16);
    --text: #f5f5f7;
    --muted: #86868b;
    --accent: #30d158;
    --accent-strong: #25b349;
    --accent-soft: rgba(48, 209, 88, 0.12);
    --apple-blue: #0071e3;
    --apple-blue-soft: rgba(0, 113, 227, 0.14);
    --apple-green: #30d158;
    --apple-green-soft: rgba(48, 209, 88, 0.14);
    --apple-orange: #ff9f0a;
    --apple-orange-soft: rgba(255, 159, 10, 0.14);
    --apple-purple: #bf5af2;
    --apple-purple-soft: rgba(191, 90, 242, 0.14);
    --apple-red: #ff453a;
    --apple-red-soft: rgba(255, 69, 58, 0.14);
    --danger: #ff453a;
    --shadow: 0 24px 80px rgba(0, 0, 0, 0.45);
    --radius-lg: 28px;
    --radius-md: 18px;
    --safe-bottom: env(safe-area-inset-bottom, 0px);
}

[data-theme="light"] {
    color-scheme: light;
    --bg: #f5f5f7;
    --surface: #ffffff;
    --surface-2: #f0f0f4;
    --surface-3: #e5e5ea;
    --line: rgba(0, 0, 0, 0.08);
    --line-strong: rgba(0, 0, 0, 0.16);
    --text: #1d1d1f;
    --muted: #6e6e73;
    --accent: #0071e3;
    --accent-strong: #0056b3;
    --accent-soft: rgba(0, 113, 227, 0.1);
    --apple-blue: #0071e3;
    --apple-blue-soft: rgba(0, 113, 227, 0.12);
    --apple-green: #28cd41;
    --apple-green-soft: rgba(40, 205, 65, 0.12);
    --apple-orange: #ff9500;
    --apple-orange-soft: rgba(255, 149, 0, 0.12);
    --apple-purple: #af52de;
    --apple-purple-soft: rgba(175, 82, 222, 0.12);
    --apple-red: #ff3b30;
    --apple-red-soft: rgba(255, 59, 48, 0.12);
    --danger: #ff3b30;
    --shadow: 0 24px 80px rgba(0, 0, 0, 0.08);
}

* {
    box-sizing: border-box;
}

html {
    min-width: 320px;
    background: var(--bg);
    scroll-behavior: smooth;
}

body {
    min-height: 100vh;
    margin: 0;
    background:
        radial-gradient(circle at 80% -5%, rgba(48, 209, 88, 0.09), transparent 38rem),
        radial-gradient(circle at 15% 30%, rgba(0, 113, 227, 0.06), transparent 32rem),
        var(--bg);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    -webkit-font-smoothing: antialiased;
}

button,
input,
select {
    color: inherit;
    font: inherit;
}

button,
select {
    cursor: pointer;
}

button:focus-visible,
input:focus-visible,
select:focus-visible,
a:focus-visible {
    outline: 3px solid color-mix(in srgb, var(--accent), transparent 35%);
    outline-offset: 3px;
}

.skip-link {
    position: fixed;
    top: 10px;
    left: 10px;
    z-index: 100;
    padding: 10px 14px;
    border-radius: 10px;
    background: var(--accent);
    color: #06120e;
    transform: translateY(-150%);
}

.skip-link:focus {
    transform: translateY(0);
}

.topbar {
    position: sticky;
    top: 0;
    z-index: 20;
    display: flex;
    min-height: 76px;
    align-items: center;
    justify-content: space-between;
    padding: 12px clamp(18px, 4vw, 52px);
    border-bottom: 1px solid var(--line);
    background: color-mix(in srgb, var(--bg), transparent 8%);
    backdrop-filter: blur(22px);
    -webkit-backdrop-filter: blur(22px);
}

.topbar-left {
    display: flex;
    align-items: center;
    gap: 14px;
}

.hub-button {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 14px;
    border: 1px solid var(--line);
    border-radius: 999px;
    background: var(--surface-2);
    color: var(--text);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-decoration: none;
    transition: border-color 0.2s ease, transform 0.2s ease;
}

.hub-button:hover {
    border-color: var(--line-strong);
    transform: translateY(-1px);
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    color: var(--text);
    text-decoration: none;
}

.brand-mark {
    display: grid;
    width: 42px;
    height: 42px;
    place-items: center;
    border: 1px solid color-mix(in srgb, var(--accent), transparent 45%);
    border-radius: 12px;
    background: var(--accent-soft);
    color: var(--accent);
    transition: transform 0.15s ease, background 0.2s ease;
}

.brand:hover .brand-mark {
    transform: scale(1.05);
}

.brand-mark svg {
    display: block;
    width: 22px;
    height: 22px;
    stroke: var(--accent);
}

.brand strong,
.brand small {
    display: block;
    letter-spacing: 0.16em;
    line-height: 1.05;
}

.brand strong {
    font-size: 14px;
}

.brand small {
    margin-top: 5px;
    color: var(--muted);
    font-size: 8px;
}

.topbar-actions {
    display: flex;
    align-items: center;
    gap: 14px;
}

.offline-badge {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    color: var(--muted);
    font-size: 12px;
}

.offline-badge span {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--accent);
    box-shadow: 0 0 0 4px var(--accent-soft);
}

.icon-button,
.ghost-button {
    min-height: 42px;
    border: 1px solid var(--line);
    border-radius: 13px;
    background: var(--surface-2);
}

.icon-button {
    min-width: 54px;
    padding: 0 10px;
    color: var(--muted);
    font-size: 11px;
}

.ghost-button {
    padding: 0 16px;
    color: var(--muted);
    font-size: 13px;
    font-weight: 700;
}

.icon-button:hover,
.ghost-button:hover {
    border-color: var(--line-strong);
    color: var(--text);
}

.app-shell {
    display: grid;
    grid-template-columns: 270px minmax(0, 1fr);
    min-height: calc(100vh - 76px);
}

.sidebar {
    display: flex;
    flex-direction: column;
    padding: 24px 14px calc(24px + var(--safe-bottom));
    border-right: 1px solid var(--line);
    max-height: calc(100vh - 76px);
    position: sticky;
    top: 76px;
    overflow-y: auto;
}

.sidebar-scrollable {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.sidebar-category-title {
    margin: 16px 0 6px;
    padding: 0 10px;
    color: var(--muted);
    font-size: 10px;
    font-weight: 800;
    letter-spacing: 0.14em;
    text-transform: uppercase;
}

.sidebar-category-title:first-child {
    margin-top: 4px;
}

.eyebrow {
    margin: 0 0 12px;
    color: var(--accent);
    font-size: 10px;
    font-weight: 800;
    letter-spacing: 0.18em;
    text-transform: uppercase;
}

.mode-nav {
    display: grid;
    gap: 6px;
}

.mode-button {
    display: grid;
    grid-template-columns: 38px minmax(0, 1fr) auto;
    width: 100%;
    min-height: 62px;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    border: 1px solid transparent;
    border-radius: 15px;
    background: transparent;
    text-align: left;
}

.mode-button:hover {
    background: var(--surface-2);
}

.mode-button.active {
    border-color: color-mix(in srgb, var(--accent), transparent 70%);
    background: var(--accent-soft);
}

.mode-icon {
    display: grid;
    width: 36px;
    height: 36px;
    place-items: center;
    border-radius: 11px;
    background: var(--surface-3);
    color: var(--muted);
    font-weight: 800;
}

.mode-button.active .mode-icon {
    background: var(--accent);
    color: #06120e;
}

.mode-button strong,
.mode-button small {
    display: block;
}

.mode-button strong {
    font-size: 13px;
}

.mode-button small {
    margin-top: 4px;
    color: var(--muted);
    font-size: 10px;
}

.history-count {
    display: grid;
    min-width: 22px;
    height: 22px;
    place-items: center;
    border-radius: 20px;
    background: var(--surface-3);
    color: var(--muted);
    font-size: 10px;
}

.sidebar-note {
    display: flex;
    gap: 11px;
    margin-top: auto;
    padding: 15px;
    border: 1px solid var(--line);
    border-radius: 15px;
    background: var(--surface-2);
}

.sidebar-note > span {
    display: grid;
    flex: 0 0 25px;
    height: 25px;
    place-items: center;
    border-radius: 50%;
    background: var(--accent-soft);
    color: var(--accent);
    font-size: 12px;
}

.sidebar-note p {
    margin: 0;
    color: var(--muted);
    font-size: 10px;
    line-height: 1.5;
}

.sidebar-note strong {
    display: block;
    margin-bottom: 2px;
    color: var(--text);
    font-size: 11px;
}

.content {
    width: 100%;
    max-width: 1180px;
    margin: 0 auto;
    padding: clamp(36px, 6vw, 76px) clamp(22px, 5vw, 72px) calc(64px + var(--safe-bottom));
}

.tool-panel[hidden] {
    display: none;
}

.section-heading,
.subheading {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 24px;
}

.section-heading {
    margin-bottom: 34px;
}

.advanced-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.3fr) minmax(300px, 0.9fr);
    gap: 20px;
}

.advanced-card {
    padding: 22px;
    border: 1px solid var(--line);
    border-radius: 24px;
    background: var(--surface);
    box-shadow: var(--shadow);
}

.vector-card {
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.vector-layout {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
}

.vector-group,
.matrix-mini {
    padding: 14px;
    border: 1px solid var(--line);
    border-radius: 16px;
    background: var(--surface-2);
}

.vector-group h3,
.matrix-header h3 {
    margin: 0 0 10px;
    color: var(--muted);
    font-size: 12px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.vector-row,
.matrix-row {
    display: grid;
    grid-template-columns: 22px minmax(0, 1fr);
    gap: 8px;
    align-items: center;
    margin-bottom: 8px;
}

.matrix-row {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    margin-bottom: 10px;
}

.vector-row label {
    color: var(--muted);
    font-weight: 700;
}

.vector-row input,
.matrix-row input {
    width: 100%;
    min-height: 42px;
    padding: 0 10px;
    border: 1px solid var(--line);
    border-radius: 10px;
    background: var(--surface);
    color: var(--text);
}

.vector-actions,
.matrix-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.utility-button.small {
    min-height: 42px;
    font-size: 12px;
    padding: 0 12px;
}

.vector-result {
    padding: 12px 14px;
    border: 1px solid color-mix(in srgb, var(--accent), transparent 65%);
    border-radius: 12px;
    background: var(--accent-soft);
    color: var(--text);
    font-weight: 700;
}

.vector-result.secondary-output {
    border-color: color-mix(in srgb, var(--highlight), transparent 60%);
    background: rgba(167, 139, 250, 0.08);
}

.graph-card {
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.graph-controls {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    align-items: center;
}

.graph-controls label {
    color: var(--muted);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.graph-controls input {
    flex: 1 1 240px;
    min-height: 46px;
    padding: 0 14px;
    border: 1px solid var(--line);
    border-radius: 12px;
    background: var(--surface-2);
    color: var(--text);
}

#graphCanvas {
    display: block;
    width: 100%;
    height: auto;
    min-height: 260px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: linear-gradient(180deg, rgba(98, 230, 181, 0.04), rgba(23, 38, 58, 0.12));
}

.utility-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
    margin-top: 18px;
}

.utility-item {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.utility-item label {
    color: var(--muted);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.utility-item input,
.utility-item select {
    min-height: 46px;
    padding: 0 12px;
    border: 1px solid var(--line);
    border-radius: 12px;
    background: var(--surface-2);
    color: var(--text);
}

.utility-button {
    min-height: 48px;
    border: 1px solid var(--line);
    border-radius: 12px;
    background: var(--accent);
    color: #06120e;
    font-weight: 800;
}

.utility-output {
    grid-column: 1 / -1;
    padding: 12px 14px;
    border: 1px solid color-mix(in srgb, var(--accent), transparent 60%);
    border-radius: 12px;
    background: var(--accent-soft);
    color: var(--text);
    font-weight: 700;
}

.secondary-output {
    margin-top: -6px;
    font-size: 0.92rem;
    font-weight: 600;
}

.secondary-grid {
    margin-top: 20px;
}

.tertiary-grid,
.quaternary-grid {
    margin-top: 20px;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
}

.mini-calculator {
    display: flex;
    flex-direction: column;
    gap: 12px;
    padding: 18px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: var(--surface-2);
}

.mini-calculator h3 {
    margin: 0;
    font-size: 13px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--muted);
}

h1,
h2,
p {
    margin-top: 0;
}

h1 {
    max-width: 720px;
    margin-bottom: 12px;
    font-family: Georgia, "Times New Roman", serif;
    font-size: clamp(34px, 5vw, 62px);
    font-weight: 400;
    letter-spacing: -0.045em;
    line-height: 1.02;
}

.section-heading > div > p:last-child {
    max-width: 620px;
    margin: 0;
    color: var(--muted);
    font-size: 14px;
    line-height: 1.65;
}

.category-wrap {
    position: relative;
    margin: 0 -4px 24px;
}

.category-search-label {
    display: inline-block;
    margin: 0 0 8px;
    color: var(--muted);
    font-size: 10px;
    font-weight: 800;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.category-search-wrap {
    margin-bottom: 12px;
}

.category-search {
    width: 100%;
    min-height: 46px;
    padding: 0 16px;
    border: 1px solid var(--line);
    border-radius: 12px;
    background: var(--surface);
    color: var(--text);
}

.category-list {
    display: flex;
    gap: 8px;
    padding: 4px 4px 10px;
    overflow-x: auto;
    scrollbar-width: none;
}

.category-list::-webkit-scrollbar {
    display: none;
}

.category-empty {
    display: flex;
    min-height: 42px;
    align-items: center;
    justify-content: center;
    border: 1px dashed var(--line-strong);
    border-radius: 12px;
    color: var(--muted);
    font-size: 12px;
}

.category-button {
    flex: 0 0 auto;
    min-height: 40px;
    padding: 0 15px;
    border: 1px solid var(--line);
    border-radius: 100px;
    background: var(--surface);
    color: var(--muted);
    font-size: 12px;
    font-weight: 700;
}

.category-button:hover {
    color: var(--text);
}

.category-button.active {
    border-color: var(--accent);
    background: var(--accent);
    color: #06120e;
}

.converter-card,
.calculator-card {
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    background: linear-gradient(145deg, var(--surface), color-mix(in srgb, var(--surface), var(--accent) 2%));
    box-shadow: var(--shadow);
}

.converter-numpad {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 10px;
    margin-top: 18px;
    padding: 12px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: var(--surface);
}

.numpad-key {
    min-height: 56px;
    border: 1px solid var(--line);
    border-radius: 12px;
    background: var(--surface-2);
    color: var(--text);
    font-size: 18px;
    font-weight: 700;
    -webkit-tap-highlight-color: transparent;
}

.numpad-key.operator {
    background: color-mix(in srgb, var(--accent-soft), var(--surface-2));
    color: var(--accent);
}

.numpad-key.action {
    color: var(--muted);
}

.numpad-key.copy {
    font-size: 11px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.numpad-key.equals {
    border-color: var(--accent);
    background: var(--accent);
    color: #06120e;
}

.numpad-key:active {
    transform: scale(0.98);
}

.converter-card {
    position: relative;
    display: grid;
    grid-template-columns: minmax(0, 1fr) 58px minmax(0, 1fr);
    align-items: center;
    padding: clamp(22px, 4vw, 42px);
}

.converter-side > label {
    display: block;
    margin-bottom: 12px;
    color: var(--muted);
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.value-input-wrap {
    position: relative;
    border-bottom: 1px solid var(--line-strong);
}

.value-input {
    width: 100%;
    height: 86px;
    padding: 0 68px 0 0;
    border: 0;
    outline: 0;
    background: transparent;
    font-family: Georgia, "Times New Roman", serif;
    font-size: clamp(38px, 6vw, 62px);
    letter-spacing: -0.04em;
}

.value-input::selection {
    background: var(--accent);
    color: #06120e;
}

.result-side .value-input {
    color: var(--accent);
}

.unit-symbol {
    position: absolute;
    right: 0;
    bottom: 18px;
    max-width: 64px;
    overflow: hidden;
    color: var(--muted);
    font-size: 16px;
    font-weight: 700;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.copy-button {
    position: absolute;
    top: -27px;
    right: 0;
    border: 0;
    background: transparent;
    color: var(--muted);
    font-size: 10px;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.copy-button:hover {
    color: var(--accent);
}

.select-label {
    margin-top: 22px;
}

select {
    width: 100%;
    min-height: 52px;
    padding: 0 42px 0 15px;
    border: 1px solid var(--line);
    border-radius: 13px;
    outline: 0;
    background-color: var(--surface-2);
    font-size: 13px;
    font-weight: 650;
}

select:focus {
    border-color: var(--accent);
}

.swap-button {
    display: grid;
    width: 44px;
    height: 44px;
    margin: 22px auto 0;
    place-items: center;
    border: 1px solid var(--line);
    border-radius: 50%;
    background: var(--surface-2);
    color: var(--accent);
    font-size: 20px;
    transition: transform 180ms ease, border-color 180ms ease;
}

.swap-button:hover {
    border-color: var(--accent);
    transform: rotate(180deg);
}

.conversion-summary {
    display: flex;
    min-height: 54px;
    align-items: center;
    gap: 10px;
    margin: 14px 0 18px;
    padding: 0 18px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: var(--surface);
    color: var(--muted);
    font-size: 11px;
}

.conversion-summary strong {
    overflow: hidden;
    color: var(--text);
    font-size: 12px;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.formula-panel {
    margin-bottom: 34px;
    padding: 18px 18px 20px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: linear-gradient(135deg, var(--surface), color-mix(in srgb, var(--surface), var(--accent) 3%));
}

.compact-header {
    margin-bottom: 18px;
}

.compact-header h2 {
    margin-bottom: 0;
    font-size: clamp(22px, 3vw, 30px);
}

.formula-box {
    display: grid;
    gap: 12px;
}

.formula-box code {
    padding: 14px 16px;
    border: 1px solid var(--line);
    border-radius: 12px;
    background: var(--surface-2);
    color: var(--text);
    font-family: "SFMono-Regular", ui-monospace, Menlo, monospace;
    font-size: 13px;
    line-height: 1.6;
    word-break: break-word;
}

.formula-box p {
    margin: 0;
    color: var(--muted);
    line-height: 1.7;
}

.conversion-summary > span:last-child {
    margin-left: auto;
    white-space: nowrap;
}

.summary-dot {
    flex: 0 0 6px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--accent);
}

.subheading {
    margin-bottom: 18px;
}

.subheading .eyebrow {
    margin-bottom: 7px;
}

h2 {
    margin-bottom: 0;
    font-family: Georgia, "Times New Roman", serif;
    font-size: 24px;
    font-weight: 400;
}

.subheading > span {
    color: var(--muted);
    font-size: 11px;
}

.reference-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 10px;
}

.reference-item {
    min-width: 0;
    padding: 17px;
    border: 1px solid var(--line);
    border-radius: 15px;
    background: var(--surface);
}

.reference-item span,
.reference-item strong {
    display: block;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.reference-item span {
    margin-bottom: 7px;
    color: var(--muted);
    font-size: 10px;
}

.reference-item strong {
    font-size: 14px;
}

.angle-toggle {
    display: flex;
    padding: 4px;
    border: 1px solid var(--line);
    border-radius: 12px;
    background: var(--surface);
}

.angle-toggle button {
    min-width: 56px;
    min-height: 34px;
    border: 0;
    border-radius: 8px;
    background: transparent;
    color: var(--muted);
    font-size: 10px;
    font-weight: 800;
}

.angle-toggle button.active {
    background: var(--accent);
    color: #06120e;
}

.calculator-card {
    max-width: 720px;
    margin: 0 auto;
    padding: clamp(16px, 3vw, 28px);
}

.calculator-display {
    min-height: 138px;
    margin-bottom: 16px;
    padding: 22px;
    overflow: hidden;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: var(--bg);
    text-align: right;
}

.expression {
    min-height: 24px;
    overflow: hidden;
    color: var(--muted);
    font-size: 15px;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.calculation-result {
    margin-top: 12px;
    overflow: hidden;
    color: var(--accent);
    font-family: Georgia, "Times New Roman", serif;
    font-size: clamp(38px, 7vw, 58px);
    text-overflow: ellipsis;
    white-space: nowrap;
}

.keypad {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 9px;
}

.key {
    min-height: 58px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: var(--surface-2);
    font-size: 16px;
    font-weight: 750;
    transition: transform 80ms ease, background 120ms ease;
    -webkit-tap-highlight-color: transparent;
}

.key:hover {
    border-color: var(--line-strong);
    background: var(--surface-3);
}

.key:active {
    transform: scale(0.95);
}

.function-key {
    color: var(--muted);
    font-size: 13px;
}

.operator-key {
    color: var(--accent);
    font-size: 21px;
}

.danger-key {
    color: var(--danger);
}

.equals-key {
    border-color: var(--accent);
    background: var(--accent);
    color: #06120e;
}

.equals-key:hover {
    background: var(--accent-strong);
}

.keyboard-hint {
    margin: 16px auto 0;
    color: var(--muted);
    font-size: 10px;
    text-align: center;
}

.history-list {
    display: grid;
    gap: 10px;
}

.history-item,
.empty-history {
    border: 1px solid var(--line);
    border-radius: 16px;
    background: var(--surface);
}

.history-item {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 18px;
    width: 100%;
    min-height: 78px;
    padding: 15px 18px;
    text-align: left;
}

.history-item:hover {
    border-color: var(--line-strong);
}

.history-item span,
.history-item strong {
    display: block;
}

.history-item span {
    overflow: hidden;
    color: var(--muted);
    font-size: 11px;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.history-item strong {
    max-width: 420px;
    margin-top: 7px;
    overflow: hidden;
    color: var(--text);
    font-family: Georgia, "Times New Roman", serif;
    font-size: 18px;
    font-weight: 400;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.history-item time {
    color: var(--muted);
    font-size: 10px;
}

.empty-history {
    padding: 52px 24px;
    color: var(--muted);
    text-align: center;
}

.empty-history strong {
    display: block;
    margin-bottom: 7px;
    color: var(--text);
}

.toast {
    position: fixed;
    right: 24px;
    bottom: calc(24px + var(--safe-bottom));
    z-index: 50;
    padding: 12px 16px;
    border: 1px solid color-mix(in srgb, var(--accent), transparent 50%);
    border-radius: 12px;
    background: var(--surface-3);
    box-shadow: var(--shadow);
    color: var(--text);
    font-size: 12px;
    opacity: 0;
    pointer-events: none;
    transform: translateY(12px);
    transition: opacity 180ms ease, transform 180ms ease;
}

.toast.show {
    opacity: 1;
    transform: translateY(0);
}

@media (max-width: 860px) {
    .app-shell {
        display: block;
    }

    .sidebar {
        position: sticky;
        top: 76px;
        z-index: 15;
        display: block;
        padding: 9px 14px;
        overflow-x: auto;
        border-right: 0;
        border-bottom: 1px solid var(--line);
        background: color-mix(in srgb, var(--bg), transparent 6%);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        scrollbar-width: none;
    }

    .sidebar::-webkit-scrollbar,
    .sidebar > .eyebrow,
    .sidebar-note,
    .mode-button small,
    .history-count {
        display: none;
    }

    .mode-nav {
        display: flex;
        min-width: max-content;
        gap: 6px;
    }

    .mode-button {
        display: flex;
        width: auto;
        min-height: 44px;
        padding: 5px 12px 5px 6px;
        border-radius: 12px;
    }

    .mode-icon {
        width: 32px;
        height: 32px;
    }

    .content {
        padding-top: 42px;
    }

    .reference-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 620px) {
    .converter-numpad {
        gap: 8px;
        padding: 10px;
    }

    .numpad-key {
        min-height: 50px;
        border-radius: 10px;
        font-size: 16px;
    }

    .numpad-key.copy {
        font-size: 10px;
    }

    .topbar {
        min-height: 66px;
        padding-inline: 16px;
    }

    .offline-badge {
        display: none;
    }

    .app-shell {
        min-height: calc(100vh - 66px);
    }

    .sidebar {
        top: 66px;
    }

    .content {
        padding: 34px 14px calc(44px + var(--safe-bottom));
    }

    .section-heading {
        align-items: flex-start;
        margin-bottom: 26px;
    }

    .section-heading .ghost-button {
        flex: 0 0 auto;
    }

    h1 {
        font-size: 38px;
    }

    .converter-card {
        grid-template-columns: minmax(0, 1fr);
        gap: 8px;
        padding: 22px 18px;
        border-radius: 22px;
    }

    .swap-button {
        margin: 4px auto;
        transform: rotate(90deg);
    }

    .swap-button:hover {
        transform: rotate(270deg);
    }

    .value-input {
        height: 66px;
        font-size: 42px;
    }

    .unit-symbol {
        bottom: 14px;
    }

    .conversion-summary {
        align-items: flex-start;
        flex-wrap: wrap;
        padding-block: 13px;
        line-height: 1.5;
    }

    .conversion-summary strong {
        flex: 1 1 calc(100% - 20px);
        white-space: normal;
    }

    .conversion-summary > span:last-child {
        width: 100%;
        margin-left: 16px;
    }

    .subheading {
        align-items: flex-start;
    }

    .subheading > span {
        max-width: 45%;
        text-align: right;
    }

    .calculator-card {
        padding: 12px;
        border-radius: 20px;
    }

    .calculator-display {
        min-height: 112px;
        padding: 18px;
    }

    .keypad {
        gap: 7px;
    }

    .key {
        min-height: 52px;
        border-radius: 12px;
        font-size: 15px;
    }

    .function-key {
        font-size: 11px;
    }

    .history-item {
        min-height: 72px;
    }
}

@media (max-width: 390px) {
    .brand-mark {
        width: 38px;
        height: 38px;
    }

    .brand strong {
        font-size: 12px;
    }

    .icon-button {
        min-width: 46px;
    }

    .mode-button {
        font-size: 12px;
    }

    .reference-item {
        padding: 14px;
    }

}

/* ==========================================================================
   Apple Cupertino Design System & Graphic Charts Studio Styles
   ========================================================================== */

/* Button Tactile Feel */
button {
    transition: transform 0.12s cubic-bezier(0.2, 0, 0, 1), box-shadow 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}

button:active {
    transform: scale(0.97);
}

/* Sidebar Featured Mode & Badge */
.mode-button .chart-icon {
    background: linear-gradient(135deg, rgba(48, 209, 88, 0.2), rgba(0, 113, 227, 0.2));
    color: var(--accent);
}

.mode-button.active .chart-icon {
    background: linear-gradient(135deg, #30d158, #0071e3) !important;
    color: #ffffff !important;
}

.new-pill {
    display: inline-flex;
    align-items: center;
    padding: 2px 7px;
    border-radius: 999px;
    background: #30d158;
    color: #000000;
    font-size: 9px;
    font-weight: 800;
    letter-spacing: 0.08em;
}

/* Visual Magnitude Ratio Comparison Card (Converter) */
.visual-comparison-card {
    margin: 16px 0 24px;
    padding: 16px 20px;
    border: 1px solid var(--line);
    border-radius: 20px;
    background: var(--surface-2);
}

.visual-comparison-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
}

.visual-comparison-header .eyebrow {
    margin: 0;
}

.ratio-badge {
    padding: 3px 10px;
    border: 1px solid var(--line);
    border-radius: 999px;
    background: var(--surface);
    color: var(--muted);
    font-size: 11px;
    font-weight: 600;
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}

.visual-bars-group {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.visual-bar-item {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.visual-bar-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    color: var(--muted);
    font-size: 12px;
    font-weight: 600;
}

.visual-track {
    width: 100%;
    height: 9px;
    border-radius: 999px;
    background: var(--surface-3);
    overflow: hidden;
}

.visual-fill {
    height: 100%;
    border-radius: 999px;
    transition: width 0.35s cubic-bezier(0.2, 0, 0, 1);
}

.visual-fill.from-fill {
    background: linear-gradient(90deg, #30d158, #34c759);
}

.visual-fill.to-fill {
    background: linear-gradient(90deg, #0071e3, #64d2ff);
}

/* Apple Memory Keys & Calc Display */
.calc-top-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    gap: 12px;
}

.calc-memory-indicator {
    padding: 2px 8px;
    border-radius: 6px;
    background: var(--surface-3);
    color: var(--muted);
    font-size: 11px;
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
    font-weight: 600;
}

.calc-memory-indicator.active {
    background: var(--apple-orange-soft);
    color: var(--apple-orange);
    border: 1px solid rgba(255, 159, 10, 0.3);
}

.memory-key {
    background: var(--surface-3) !important;
    color: var(--muted) !important;
    font-weight: 600 !important;
    font-size: 13px !important;
}

.memory-key:hover {
    color: var(--text) !important;
}

/* ==========================================================================
   CHARTS & DATA STUDIO (Apple Health / Stocks Style)
   ========================================================================== */
.charts-workspace {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.charts-controls-bar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 14px 18px;
    border: 1px solid var(--line);
    border-radius: 20px;
    background: var(--surface);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
}

.control-cluster {
    display: flex;
    align-items: center;
    gap: 10px;
}

.control-label {
    color: var(--muted);
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

/* Apple Cupertino Segmented Control */
.segmented-control {
    display: inline-flex;
    padding: 4px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: var(--surface-2);
    gap: 3px;
}

.segmented-control.small {
    padding: 3px;
    border-radius: 12px;
}

.segmented-item {
    padding: 6px 14px;
    border: none;
    border-radius: 10px;
    background: transparent;
    color: var(--muted);
    font-size: 13px;
    font-weight: 600;
    transition: all 0.18s cubic-bezier(0.2, 0, 0, 1);
    white-space: nowrap;
}

.segmented-control.small .segmented-item {
    padding: 5px 12px;
    font-size: 12px;
}

.segmented-item:hover {
    color: var(--text);
}

.segmented-item.active {
    background: var(--surface);
    color: var(--text);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.25);
}

[data-theme="light"] .segmented-item.active {
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

/* Color Palette Picker */
.chart-theme-picker {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 4px 8px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: var(--surface-2);
}

.theme-dot {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    border: 2px solid transparent;
    padding: 0;
    cursor: pointer;
    transition: transform 0.15s ease, border-color 0.15s ease;
}

.theme-dot[data-palette="green"] { background: #30d158; }
.theme-dot[data-palette="blue"] { background: #0071e3; }
.theme-dot[data-palette="orange"] { background: #ff9f0a; }
.theme-dot[data-palette="purple"] { background: #bf5af2; }

.theme-dot.active {
    border-color: #ffffff;
    transform: scale(1.18);
    box-shadow: 0 0 10px rgba(255, 255, 255, 0.35);
}

/* Chart Stage Card */
.chart-stage-card {
    position: relative;
    padding: 24px;
    border: 1px solid var(--line);
    border-radius: 28px;
    background: var(--surface);
    box-shadow: var(--shadow);
    backdrop-filter: blur(28px);
    -webkit-backdrop-filter: blur(28px);
}

.chart-stage-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 20px;
}

.chart-eyebrow {
    display: block;
    color: var(--accent);
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    margin-bottom: 4px;
}

.chart-main-title {
    margin: 0;
    font-size: 24px;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--text);
}

.chart-stat-pill {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 4px;
}

.pill-number {
    font-size: 26px;
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--text);
}

.pill-number small {
    font-size: 13px;
    font-weight: 500;
    color: var(--muted);
}

.pill-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 3px 9px;
    border-radius: 999px;
    font-size: 11px;
    font-weight: 700;
}

.pill-badge.positive {
    background: rgba(48, 209, 88, 0.16);
    color: #30d158;
}

.pill-badge.negative {
    background: rgba(255, 69, 58, 0.16);
    color: #ff453a;
}

/* Canvas Container & Apple Floating Tooltip */
.canvas-relative-container {
    position: relative;
    width: 100%;
    border-radius: 20px;
    background: var(--surface-2);
    overflow: hidden;
}

#dataChartCanvas {
    display: block;
    width: 100%;
    height: 380px;
    cursor: crosshair;
}

#triangleCanvas {
    display: block;
    width: 100%;
    height: 300px;
    background: transparent;
}

#resistorCanvas {
    display: block;
    width: 100%;
    height: 170px;
    background: transparent;
}

.apple-chart-tooltip {
    position: absolute;
    top: 24px;
    left: 24px;
    z-index: 10;
    pointer-events: none;
    min-width: 180px;
    padding: 12px 16px;
    border: 1px solid rgba(255, 255, 255, 0.14);
    border-radius: 16px;
    background: rgba(20, 20, 26, 0.88);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.4);
    color: #f5f5f7;
    transition: transform 0.08s ease-out, opacity 0.12s ease;
}

[data-theme="light"] .apple-chart-tooltip {
    background: rgba(255, 255, 255, 0.92);
    border-color: rgba(0, 0, 0, 0.08);
    color: #1d1d1f;
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.12);
}

.tt-header {
    color: var(--muted);
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 6px;
}

.tt-body {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 12px;
}

.tt-main-val {
    font-size: 22px;
    font-weight: 800;
    letter-spacing: -0.02em;
}

.tt-delta {
    font-size: 11px;
    font-weight: 700;
}

.tt-delta.positive { color: #30d158; }
.tt-delta.negative { color: #ff453a; }

.tt-footer {
    margin-top: 6px;
    padding-top: 6px;
    border-top: 1px solid var(--line);
    color: var(--muted);
    font-size: 10px;
    font-weight: 600;
}

.chart-scrubber-footer {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 14px;
    color: var(--muted);
    font-size: 12px;
}

.scrubber-legend-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--accent);
    box-shadow: 0 0 8px var(--accent);
}

/* Apple Bento Metrics Grid */
.bento-grid {
    display: grid;
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 14px;
}

@media (max-width: 1024px) {
    .bento-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
}

@media (max-width: 640px) {
    .bento-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

.bento-card {
    padding: 18px;
    border: 1px solid var(--line);
    border-radius: 22px;
    background: var(--surface);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    transition: transform 0.2s cubic-bezier(0.2, 0, 0, 1), border-color 0.2s ease;
}

.bento-card:hover {
    transform: translateY(-2px);
    border-color: var(--line-strong);
}

.bento-header {
    display: flex;
    align-items: center;
    gap: 7px;
    margin-bottom: 10px;
}

.bento-icon {
    font-size: 14px;
}

.bento-label {
    color: var(--muted);
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.bento-val {
    font-size: 22px;
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--text);
    margin-bottom: 4px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.bento-sub {
    color: var(--muted);
    font-size: 11px;
    font-weight: 500;
}

/* Interactive Data Studio: Table & Raw JSON */
.data-studio-card {
    padding: 22px;
    border: 1px solid var(--line);
    border-radius: 26px;
    background: var(--surface);
}

.studio-header {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    margin-bottom: 18px;
}

.studio-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.ghost-button.small {
    min-height: 34px;
    padding: 0 12px;
    font-size: 12px;
    border-radius: 10px;
}

.days-table-wrap {
    max-height: 320px;
    overflow-y: auto;
    border: 1px solid var(--line);
    border-radius: 16px;
}

.days-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
    text-align: left;
}

.days-table th {
    position: sticky;
    top: 0;
    padding: 10px 14px;
    background: var(--surface-2);
    color: var(--muted);
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    border-bottom: 1px solid var(--line);
}

.days-table td {
    padding: 8px 14px;
    border-bottom: 1px solid var(--line);
    color: var(--text);
}

.days-table input {
    width: 100%;
    min-height: 34px;
    padding: 0 10px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--surface);
    color: var(--text);
    font-size: 13px;
}

.days-table .day-share-bar {
    width: 100%;
    height: 6px;
    border-radius: 999px;
    background: var(--surface-3);
    overflow: hidden;
}

.days-table .day-share-fill {
    height: 100%;
    border-radius: 999px;
    background: var(--accent);
}

.days-table .row-del-btn {
    padding: 4px 10px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: transparent;
    color: var(--danger);
    font-size: 11px;
    font-weight: 700;
}

.days-table .row-del-btn:hover {
    background: rgba(255, 69, 58, 0.12);
}

.json-editor-wrap {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.code-textarea {
    width: 100%;
    padding: 14px;
    border: 1px solid var(--line);
    border-radius: 16px;
    background: var(--surface-2);
    color: var(--text);
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    font-size: 13px;
    line-height: 1.5;
    resize: vertical;
}

.code-textarea:focus {
    outline: none;
    border-color: var(--accent);
}

.json-status-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 12px;
}

.json-validation-badge {
    padding: 4px 10px;
    border-radius: 999px;
    font-weight: 700;
}

.json-validation-badge.valid {
    background: rgba(48, 209, 88, 0.15);
    color: #30d158;
}

.json-validation-badge.invalid {
    background: rgba(255, 69, 58, 0.15);
    color: #ff453a;
}

.json-points-count {
    color: var(--muted);
    font-weight: 600;
}

/* ==========================================================================
   ADVANCED UTILITIES ENHANCEMENTS (All Fixed & Supercharged)
   ========================================================================== */

/* Function Graph Zoom & Presets */
.graph-zoom-controls {
    display: flex;
    align-items: center;
    gap: 6px;
}

.zoom-btn {
    width: 32px;
    height: 32px;
    display: grid;
    place-items: center;
    border: 1px solid var(--line);
    border-radius: 10px;
    background: var(--surface-2);
    color: var(--text);
    font-size: 15px;
    font-weight: 700;
}

.zoom-btn:hover {
    background: var(--surface-3);
    border-color: var(--line-strong);
}

.equation-presets {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin: 10px 0 14px;
}

.preset-chip {
    padding: 4px 10px;
    border: 1px solid var(--line);
    border-radius: 999px;
    background: var(--surface-2);
    color: var(--muted);
    font-size: 11px;
    font-weight: 600;
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}

.preset-chip:hover {
    color: var(--text);
    border-color: var(--line-strong);
}

.preset-chip.active {
    background: var(--accent-soft);
    color: var(--accent);
    border-color: var(--accent);
}

.graph-hover-pill {
    position: absolute;
    bottom: 12px;
    right: 12px;
    padding: 4px 10px;
    border-radius: 999px;
    background: rgba(14, 22, 39, 0.85);
    backdrop-filter: blur(12px);
    border: 1px solid var(--line);
    color: var(--accent);
    font-size: 11px;
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
    font-weight: 700;
}

/* Vector & Matrix Dedicated Result Boxes */
.vector-result-box,
.matrix-result-box {
    margin-top: 10px;
    padding: 12px 14px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: var(--surface-2);
    color: var(--text);
    font-size: 13px;
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
    font-weight: 600;
    line-height: 1.4;
}

/* Compound Growth Live Chart */
.compound-chart-container {
    width: 100%;
    margin: 14px 0;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: var(--surface-2);
    overflow: hidden;
}

#compoundGrowthCanvas {
    display: block;
    width: 100%;
    height: 180px;
}

/* Loan Amortization Payoff Bar */
.loan-breakdown-bar {
    display: flex;
    width: 100%;
    height: 14px;
    margin: 14px 0 10px;
    border-radius: 999px;
    overflow: hidden;
    background: var(--surface-3);
}

.loan-bar-principal {
    height: 100%;
    background: #0071e3;
    transition: width 0.3s ease;
}

.loan-bar-interest {
    height: 100%;
    background: #ff9f0a;
    transition: width 0.3s ease;
}

/* BMI Color Gauge */
.bmi-gauge-wrap {
    position: relative;
    width: 100%;
    margin: 8px 0 12px;
}

.bmi-gauge-track {
    display: flex;
    width: 100%;
    height: 10px;
    border-radius: 999px;
    overflow: hidden;
}

.bmi-seg.under { flex: 18.5; background: #64d2ff; }
.bmi-seg.normal { flex: 6.5; background: #30d158; }
.bmi-seg.over { flex: 5; background: #ff9f0a; }
.bmi-seg.obese { flex: 10; background: #ff453a; }

.bmi-pointer {
    position: absolute;
    top: -4px;
    width: 18px;
    height: 18px;
    border: 2px solid #ffffff;
    border-radius: 50%;
    background: #000000;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.4);
    transform: translateX(-50%);
    transition: left 0.3s cubic-bezier(0.2, 0, 0, 1);
}

/* Stats Histogram Canvas */
#statsHistogramCanvas {
    display: block;
    width: 100%;
    height: 85px;
    margin: 8px 0;
    border: 1px solid var(--line);
    border-radius: 12px;
    background: var(--surface);
}

/* ==========================================================================
   SOUND PROFILES & ZEN MODE
   ========================================================================== */
.sound-select {
    min-height: 42px;
    padding: 0 12px;
    border: 1px solid var(--line);
    border-radius: 13px;
    background: var(--surface-2);
    color: var(--text);
    font-size: 12px;
    font-weight: 600;
}

body.zen-mode .topbar,
body.zen-mode .sidebar {
    display: none !important;
}

body.zen-mode .app-shell {
    grid-template-columns: 1fr !important;
    max-width: 1400px;
    margin: 0 auto;
}

/* Constants Quick Bar */
.constants-quick-bar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px;
    margin-bottom: 12px;
    padding: 8px 14px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: var(--surface);
}

.constants-bar-label {
    color: var(--muted);
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-right: 4px;
}

.const-chip {
    padding: 4px 10px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--surface-2);
    color: var(--text);
    font-size: 12px;
    font-weight: 600;
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}

.const-chip:hover {
    background: var(--surface-3);
    border-color: var(--accent);
}

/* ==========================================================================
   PROGRAMMER & BITWISE LABORATORY STYLES
   ========================================================================== */
.programmer-workspace {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.prog-top-controls {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    padding: 12px 18px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: var(--surface);
}

.prog-radix-card {
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding: 18px;
    border: 1px solid var(--line);
    border-radius: 24px;
    background: var(--surface);
}

.radix-row {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px 12px;
    border: 1px solid transparent;
    border-radius: 14px;
    background: var(--surface-2);
    transition: border-color 0.15s ease;
}

.radix-row.active-radix {
    border-color: var(--accent);
    background: color-mix(in srgb, var(--surface-2), var(--accent-soft) 20%);
}

.radix-badge {
    min-width: 44px;
    padding: 4px 8px;
    border-radius: 8px;
    background: var(--surface-3);
    color: var(--muted);
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-align: center;
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}

.radix-input {
    flex: 1 1 auto;
    border: none;
    background: transparent;
    color: var(--text);
    font-size: 17px;
    font-weight: 700;
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
    letter-spacing: 0.04em;
}

.radix-input:focus {
    outline: none;
}

.radix-copy-btn {
    padding: 4px 10px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: transparent;
    color: var(--muted);
    font-size: 11px;
    font-weight: 600;
}

.radix-copy-btn:hover {
    color: var(--text);
    border-color: var(--line-strong);
}

/* 64-Bit Flipper Grid */
.bit-flipper-card {
    padding: 22px;
    border: 1px solid var(--line);
    border-radius: 26px;
    background: var(--surface);
}

.bit-flipper-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    margin-bottom: 16px;
}

.ascii-preview {
    padding: 4px 12px;
    border: 1px solid var(--line);
    border-radius: 10px;
    background: var(--surface-2);
    color: var(--muted);
    font-size: 12px;
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}

.ascii-preview strong {
    color: var(--accent);
}

.bit-matrix-grid {
    display: grid;
    grid-template-columns: repeat(8, minmax(0, 1fr));
    gap: 10px;
}

@media (max-width: 900px) {
    .bit-matrix-grid {
        grid-template-columns: repeat(4, minmax(0, 1fr));
    }
}

.bit-byte-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 8px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: var(--surface-2);
}

.bit-byte-label {
    color: var(--muted);
    font-size: 10px;
    font-weight: 700;
    text-align: center;
    font-family: ui-monospace, monospace;
}

.bit-pills-row {
    display: grid;
    grid-template-columns: repeat(8, minmax(0, 1fr));
    gap: 2px;
}

.bit-pill {
    padding: 6px 0;
    border: 1px solid var(--line);
    border-radius: 6px;
    background: var(--surface);
    color: var(--muted);
    font-size: 12px;
    font-weight: 800;
    font-family: ui-monospace, SFMono-Regular, monospace;
    text-align: center;
    cursor: pointer;
    transition: all 0.1s ease;
}

.bit-pill.active {
    background: var(--accent);
    color: #000000;
    border-color: var(--accent);
    box-shadow: 0 0 8px var(--accent-soft);
}

.prog-ops-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    align-items: center;
    justify-content: space-between;
    padding: 14px 18px;
    border: 1px solid var(--line);
    border-radius: 20px;
    background: var(--surface);
}

.ops-cluster {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
}

.utility-button.active-op {
    background: var(--accent) !important;
    color: #000000 !important;
    font-weight: 700 !important;
    border-color: var(--accent) !important;
    box-shadow: 0 0 14px var(--accent-soft) !important;
}

.prog-op-hud {
    display: flex;
    flex-direction: column;
    gap: 14px;
    padding: 16px 20px;
    border: 1px solid var(--accent);
    border-radius: 20px;
    background: var(--surface-glass, rgba(255, 255, 255, 0.05));
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    box-shadow: 0 12px 36px rgba(0, 0, 0, 0.28), 0 0 16px var(--accent-soft);
    animation: fadeInSlideDown 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.prog-op-hud[hidden] {
    display: none !important;
}

.prog-op-hud-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.prog-op-hud-title-wrap {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.prog-op-badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 12px;
    border-radius: 999px;
    background: var(--accent);
    color: #000000;
    font-size: 0.82rem;
    font-weight: 800;
    letter-spacing: 0.5px;
    font-family: ui-monospace, SFMono-Regular, monospace;
}

.prog-op-subtext {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.prog-op-close {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 1.15rem;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 8px;
    transition: all 0.15s ease;
}

.prog-op-close:hover {
    background: var(--surface-active);
    color: var(--text-primary);
}

.prog-op-hud-body {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.prog-op-input-group {
    display: flex;
    align-items: center;
    gap: 10px;
}

.prog-op-input {
    flex: 1;
    min-width: 180px;
    padding: 10px 14px;
    border-radius: 12px;
    border: 1px solid var(--line);
    background: var(--bg-card);
    color: var(--text-primary);
    font-family: ui-monospace, SFMono-Regular, monospace;
    font-size: 0.95rem;
    outline: none;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.prog-op-input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-soft);
}

.prog-op-apply {
    padding: 10px 22px;
    border-radius: 12px;
    font-weight: 700;
    cursor: pointer;
    white-space: nowrap;
}

.prog-quick-masks {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.quick-masks-label {
    font-size: 0.78rem;
    color: var(--text-tertiary);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.mask-chip {
    padding: 5px 11px;
    border-radius: 8px;
    border: 1px solid var(--line);
    background: var(--surface);
    color: var(--text-primary);
    font-size: 0.8rem;
    font-family: ui-monospace, SFMono-Regular, monospace;
    cursor: pointer;
    transition: all 0.15s ease;
}

.mask-chip:hover {
    background: var(--accent-soft);
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-1px);
}

/* Advanced Programmer Lab Extensions */
.prog-card {
    display: flex;
    flex-direction: column;
    gap: 16px;
    padding: 18px 22px;
    border: 1px solid var(--line);
    border-radius: 20px;
    background: var(--surface);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.prog-card:hover {
    border-color: var(--accent-soft);
}

.prog-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    flex-wrap: wrap;
}

.prog-card-header h3, .prog-card-header h4 {
    margin: 4px 0 0 0;
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-primary);
}

.alu-metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
    gap: 12px;
}

.alu-metric-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 10px 14px;
    border-radius: 12px;
    background: var(--bg-card);
    border: 1px solid var(--line);
}

.alu-metric-label {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 600;
}

.alu-metric-value {
    font-family: ui-monospace, SFMono-Regular, monospace;
    font-size: 1.05rem;
    color: var(--text-primary);
    word-break: break-all;
}

.twiddling-hacks-bar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
    padding-top: 6px;
    border-top: 1px solid var(--line-subtle, rgba(255, 255, 255, 0.06));
}

/* Float Dissector */
.float-dissector-body {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.float-visual-strip {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.float-segment {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 12px 16px;
    border-radius: 14px;
    background: var(--bg-card);
    border: 1px solid var(--line);
    min-width: 100px;
    flex: 1 1 auto;
}

.float-sign-seg {
    border-color: rgba(100, 210, 255, 0.4);
    background: rgba(0, 113, 227, 0.08);
}
.float-sign-seg .float-seg-title { color: #64d2ff; }

.float-exp-seg {
    border-color: rgba(255, 159, 10, 0.4);
    background: rgba(255, 159, 10, 0.08);
}
.float-exp-seg .float-seg-title { color: #ff9f0a; }

.float-mantissa-seg {
    border-color: rgba(48, 209, 88, 0.4);
    background: rgba(48, 209, 88, 0.08);
    flex: 2 1 200px;
}
.float-mantissa-seg .float-seg-title { color: #30d158; }

.float-seg-title {
    font-size: 0.72rem;
    font-weight: 800;
    letter-spacing: 0.6px;
    text-transform: uppercase;
    font-family: ui-monospace, SFMono-Regular, monospace;
}

.float-seg-val {
    font-family: ui-monospace, SFMono-Regular, monospace;
    font-size: 1.05rem;
    color: var(--text-primary);
    word-break: break-all;
    letter-spacing: 0.5px;
}

.float-seg-sub {
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-family: ui-monospace, SFMono-Regular, monospace;
}

.float-eval-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
    padding: 12px 16px;
    border-radius: 14px;
    background: var(--bg-card);
    border: 1px solid var(--line);
}

.float-input-wrap {
    display: flex;
    align-items: center;
    gap: 10px;
    flex: 1 1 280px;
}

.float-input-wrap label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    white-space: nowrap;
}

.float-dec-input {
    flex: 1;
    min-width: 140px;
    padding: 8px 12px;
    border-radius: 10px;
    border: 1px solid var(--line);
    background: var(--surface);
    color: var(--text-primary);
    font-family: ui-monospace, SFMono-Regular, monospace;
    font-size: 0.95rem;
    outline: none;
}

.float-dec-input:focus {
    border-color: var(--accent);
}

.float-eval-result {
    display: flex;
    align-items: center;
    gap: 12px;
}

.float-eval-value {
    font-family: ui-monospace, SFMono-Regular, monospace;
    font-size: 1.15rem;
    color: var(--accent);
}

.float-status-badge {
    padding: 3px 10px;
    border-radius: 999px;
    background: var(--surface-active);
    color: var(--text-secondary);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Inspectors Grid */
.prog-inspectors-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 18px;
}

.subnet-fields-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.subnet-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    font-size: 0.88rem;
    padding: 6px 0;
    border-bottom: 1px solid var(--line-subtle, rgba(255, 255, 255, 0.04));
}

.subnet-row:last-child {
    border-bottom: none;
}

.subnet-row span {
    color: var(--text-secondary);
}

.subnet-row strong {
    font-family: ui-monospace, SFMono-Regular, monospace;
    color: var(--text-primary);
}

.subnet-ip-input {
    width: 140px;
    padding: 4px 8px;
    border-radius: 6px;
    border: 1px solid var(--line);
    background: var(--bg-card);
    color: var(--text-primary);
    font-family: ui-monospace, SFMono-Regular, monospace;
    font-size: 0.9rem;
    font-weight: 700;
    text-align: right;
    outline: none;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.subnet-ip-input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(0, 113, 227, 0.2);
}

.cidr-stepper {
    display: flex;
    align-items: center;
    gap: 8px;
}

.cidr-slider {
    width: 100px;
    accent-color: var(--accent);
    cursor: pointer;
}

.color-swatch-label {
    position: relative;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
}

.color-picker-hidden {
    position: absolute;
    opacity: 0;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    cursor: pointer;
    margin: 0;
    padding: 0;
    border: none;
}

.color-swatch-pill {
    width: 44px;
    height: 30px;
    border-radius: 8px;
    border: 2px solid var(--line);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.25);
    transition: transform 0.15s ease, border-color 0.15s ease, background-color 0.15s ease;
    cursor: pointer;
}

.color-swatch-pill:hover {
    transform: scale(1.08);
    border-color: var(--accent);
}

.color-inspect-body {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.color-channels-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
}

.channel-box {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    padding: 8px 4px;
    border-radius: 10px;
    background: var(--bg-card);
    border: 1px solid var(--line);
    transition: border-color 0.15s ease;
}

.channel-box:focus-within {
    border-color: var(--accent);
}

.channel-box .ch-name {
    font-size: 0.72rem;
    font-weight: 800;
    color: var(--text-tertiary);
}

.channel-box strong {
    font-family: ui-monospace, SFMono-Regular, monospace;
    font-size: 0.95rem;
}

.channel-input {
    width: 100%;
    text-align: center;
    background: transparent;
    border: none;
    border-bottom: 1px dashed var(--line);
    color: var(--text-primary);
    font-family: ui-monospace, SFMono-Regular, monospace;
    font-size: 0.95rem;
    font-weight: 700;
    padding: 2px 0;
    outline: none;
    -moz-appearance: textfield;
}

.channel-input::-webkit-outer-spin-button,
.channel-input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.channel-input:focus {
    border-bottom: 2px solid var(--accent);
    color: var(--accent);
}

.color-codes-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.color-code-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    font-size: 0.85rem;
    padding: 6px 10px;
    border-radius: 8px;
    background: var(--bg-card);
}

.color-code-item span {
    color: var(--text-tertiary);
    font-size: 0.78rem;
    font-weight: 700;
    width: 55px;
}

.color-code-item code {
    flex: 1;
    font-family: ui-monospace, SFMono-Regular, monospace;
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.copy-tiny-btn {
    padding: 3px 8px;
    border-radius: 6px;
    border: 1px solid var(--line);
    background: var(--surface);
    color: var(--text-secondary);
    font-size: 0.72rem;
    cursor: pointer;
    transition: all 0.15s ease;
}

.copy-tiny-btn:hover {
    background: var(--accent);
    color: #000;
    border-color: var(--accent);
}

/* Codegen Card */
.codegen-langs-tabs {
    display: flex;
    gap: 6px;
    overflow-x: auto;
    padding-bottom: 4px;
    scrollbar-width: thin;
}

.lang-tab {
    padding: 6px 14px;
    border-radius: 10px;
    border: 1px solid var(--line);
    background: var(--surface);
    color: var(--text-secondary);
    font-size: 0.82rem;
    font-weight: 600;
    cursor: pointer;
    white-space: nowrap;
    transition: all 0.15s ease;
}

.lang-tab:hover {
    background: var(--surface-active);
    color: var(--text-primary);
}

.lang-tab.active {
    background: var(--accent);
    color: #000000;
    border-color: var(--accent);
    font-weight: 700;
    box-shadow: 0 0 10px var(--accent-soft);
}

.codegen-code-box {
    padding: 14px 18px;
    border-radius: 14px;
    background: #0d1117;
    border: 1px solid var(--line);
    overflow-x: auto;
}

.codegen-code-box pre {
    margin: 0;
}

.codegen-code {
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
    font-size: 0.95rem;
    color: #38bdf8;
    line-height: 1.5;
}

/* ==========================================================================
   CALCULUS & EQUATION STUDIO STYLES
   ========================================================================== */
.calculus-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.4fr) minmax(320px, 1fr);
    gap: 20px;
}

@media (max-width: 960px) {
    .calculus-grid {
        grid-template-columns: minmax(0, 1fr);
    }
}

.calculus-canvas-card {
    grid-column: 1 / -1;
}

#calculusCanvas {
    display: block;
    width: 100%;
    height: 400px;
    cursor: crosshair;
}

/* ==========================================================================
   MATRIX & LINEAR ALGEBRA LAB STYLES
   ========================================================================== */
.matrix-lab-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
}

@media (max-width: 768px) {
    .matrix-lab-grid {
        grid-template-columns: minmax(0, 1fr);
    }
}

.matrix-box-card {
    padding: 20px;
    border-radius: 24px;
}

.matrix-box-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 14px;
}

.matrix-box-header h3 {
    margin: 0;
    font-size: 14px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--muted);
}

.matrix-grid-input {
    display: grid;
    gap: 8px;
    padding: 12px;
    border: 1px solid var(--line);
    border-radius: 16px;
    background: var(--surface-2);
}

.matrix-cell-input {
    width: 100%;
    min-height: 44px;
    padding: 0 8px;
    border: 1px solid var(--line);
    border-radius: 10px;
    background: var(--surface);
    color: var(--text);
    font-size: 15px;
    font-weight: 700;
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
    text-align: center;
}

.matrix-actions-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 16px 0;
}

.matrix-output-card {
    padding: 20px;
    border: 1px solid var(--line);
    border-radius: 22px;
    background: var(--surface);
    margin-bottom: 20px;
}

.matrix-result-display {
    margin-top: 10px;
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
    font-size: 15px;
    font-weight: 600;
    line-height: 1.5;
    color: var(--text);
}

.linear-system-card {
    padding: 20px;
    border-radius: 24px;
}

.system-vector-row {
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 12px 0;
}

.vector-input-line {
    flex: 1 1 auto;
    min-height: 42px;
    padding: 0 14px;
    border: 1px solid var(--line);
    border-radius: 12px;
    background: var(--surface-2);
    color: var(--text);
    font-family: ui-monospace, monospace;
    font-weight: 600;
}

/* ==========================================================================
   FINANCIAL & WEALTH INTELLIGENCE STYLES
   ========================================================================== */
.finance-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.4fr) minmax(320px, 1fr);
    gap: 20px;
}

@media (max-width: 960px) {
    .finance-grid {
        grid-template-columns: minmax(0, 1fr);
    }
}

.retirement-card {
    grid-column: 1 / -1;
}

#retirementGrowthCanvas {
    display: block;
    width: 100%;
    height: 220px;
}

.paycheck-donut-wrap {
    display: flex;
    align-items: center;
    gap: 24px;
    margin: 16px 0;
}

@media (max-width: 600px) {
    .paycheck-donut-wrap {
        flex-direction: column;
    }
}

#paycheckDonutCanvas {
    width: 180px;
    height: 180px;
    flex-shrink: 0;
}

.paycheck-breakdown-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    width: 100%;
}

.paycheck-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 6px 10px;
    border-radius: 10px;
    background: var(--surface-2);
    font-size: 13px;
    font-weight: 600;
}

.paycheck-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    margin-right: 8px;
    display: inline-block;
}

/* ==========================================================================
   PHYSICS & ENGINEERING STYLES
   ========================================================================== */
.physics-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
}

@media (max-width: 840px) {
    .physics-grid {
        grid-template-columns: minmax(0, 1fr);
    }
}

.constants-drawer-card {
    grid-column: 1 / -1;
}

.constants-table-wrap {
    max-height: 280px;
    overflow-y: auto;
    border: 1px solid var(--line);
    border-radius: 16px;
    margin-top: 12px;
}

.constants-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}

.constants-table th {
    position: sticky;
    top: 0;
    padding: 10px 14px;
    background: var(--surface-2);
    color: var(--muted);
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    text-align: left;
    border-bottom: 1px solid var(--line);
}

.constants-table td {
    padding: 8px 14px;
    border-bottom: 1px solid var(--line);
    font-family: ui-monospace, SFMono-Regular, monospace;
}

.constants-table .insert-const-btn {
    padding: 4px 9px;
    border: 1px solid var(--line);
    border-radius: 6px;
    background: var(--surface-2);
    color: var(--text-secondary);
    font-size: 11px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.15s ease;
}

.constants-table .insert-const-btn:hover {
    background: var(--surface-3);
    color: var(--text);
    border-color: rgba(255, 255, 255, 0.2);
}

.constants-table .calc-const-btn {
    background: var(--accent-soft);
    color: var(--accent);
    border-color: color-mix(in srgb, var(--accent), transparent 60%);
}

.constants-table .calc-const-btn:hover {
    background: var(--accent);
    color: #0c101a;
    border-color: var(--accent);
}

#projectileCanvas {
    display: block;
    width: 100%;
    height: 200px;
}

/* ==========================================================================
   KEYBOARD SHORTCUTS MODAL
   ========================================================================== */
.shortcuts-modal-backdrop {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: grid;
    place-items: center;
    padding: 20px;
    background: rgba(0, 0, 0, 0.65);
    backdrop-filter: blur(16px);
}

.shortcuts-modal-backdrop[hidden] {
    display: none;
}

.shortcuts-modal-card {
    width: 100%;
    max-width: 460px;
    padding: 26px;
    border: 1px solid var(--line);
    border-radius: 26px;
    background: var(--surface);
    box-shadow: 0 24px 80px rgba(0, 0, 0, 0.5);
}

.shortcuts-modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
}

.shortcuts-modal-header h2 {
    margin: 0;
    font-size: 20px;
    font-weight: 700;
}

.close-modal-btn {
    width: 32px;
    height: 32px;
    display: grid;
    place-items: center;
    border: 1px solid var(--line);
    border-radius: 50%;
    background: var(--surface-2);
    color: var(--muted);
    font-size: 14px;
}

.shortcuts-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.shortcut-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 13px;
    font-weight: 600;
    color: var(--text);
}

kbd {
    display: inline-block;
    padding: 3px 8px;
    border: 1px solid var(--line);
    border-radius: 6px;
    background: var(--surface-2);
    color: var(--accent);
    font-family: ui-monospace, SFMono-Regular, monospace;
    font-size: 12px;
    box-shadow: 0 2px 0 rgba(0, 0, 0, 0.2);
}

/* ============================================================
   BEAST MODE: AUDIO OSCILLOSCOPE & TOPBAR TOOLS
   ============================================================ */
.audio-oscilloscope {
    width: 64px;
    height: 24px;
    border-radius: 12px;
    background: rgba(0, 0, 0, 0.4);
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.5);
    display: block;
}

[data-theme="light"] .audio-oscilloscope {
    background: rgba(0, 0, 0, 0.08);
    border: 1px solid rgba(0, 0, 0, 0.12);
}

.omni-trigger-btn {
    font-size: 12px;
    font-weight: 700;
    gap: 4px;
    padding: 0 12px;
    background: var(--apple-blue-soft);
    color: var(--apple-blue);
    border: 1px solid rgba(0, 113, 227, 0.25);
}

.omni-trigger-btn:hover {
    background: var(--apple-blue);
    color: #ffffff;
}

/* ============================================================
   BEAST MODE: SPOTLIGHT OMNI COMMAND PALETTE MODAL
   ============================================================ */
[hidden],
.omni-modal-backdrop[hidden] {
    display: none !important;
}

.omni-modal-backdrop {
    position: fixed;
    inset: 0;
    z-index: 10000;
    background: rgba(0, 0, 0, 0.65);
    backdrop-filter: blur(28px) saturate(180%);
    -webkit-backdrop-filter: blur(28px) saturate(180%);
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding-top: 14vh;
}

.omni-modal-card {
    width: 100%;
    max-width: 640px;
    background: var(--surface);
    border: 1px solid var(--line-strong);
    border-radius: 20px;
    box-shadow: 0 32px 100px rgba(0, 0, 0, 0.7);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.omni-search-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 20px;
    border-bottom: 1px solid var(--line);
    background: rgba(255, 255, 255, 0.02);
}

.omni-search-icon {
    font-size: 18px;
    opacity: 0.7;
}

.omni-input {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    color: var(--text);
    font-size: 16px;
    font-weight: 500;
    font-family: inherit;
}

.omni-input::placeholder {
    color: var(--muted);
    font-size: 14px;
}

.omni-esc-badge {
    cursor: pointer;
    font-size: 11px;
}

.omni-eval-card {
    padding: 14px 20px;
    background: var(--apple-blue-soft);
    border-bottom: 1px solid var(--line);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.omni-eval-label {
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--apple-blue);
    margin-bottom: 2px;
}

.omni-eval-value {
    font-size: 22px;
    font-weight: 800;
    color: var(--text);
    font-family: ui-monospace, SFMono-Regular, monospace;
}

.omni-eval-actions {
    display: flex;
    gap: 8px;
}

.omni-action-pill {
    padding: 6px 12px;
    font-size: 12px;
    font-weight: 600;
    border-radius: 8px;
    border: 1px solid var(--line);
    background: var(--surface);
    color: var(--text);
    cursor: pointer;
    transition: all 0.15s ease;
}

.omni-action-pill:hover {
    background: var(--apple-blue);
    color: #ffffff;
    border-color: var(--apple-blue);
}

.omni-results-list {
    max-height: 380px;
    overflow-y: auto;
    padding: 8px 0;
}

.omni-result-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 20px;
    cursor: pointer;
    transition: background 0.12s ease;
}

.omni-result-item:hover,
.omni-result-item.selected {
    background: var(--surface-2);
}

.omni-item-left {
    display: flex;
    align-items: center;
    gap: 12px;
}

.omni-item-icon {
    font-size: 16px;
    width: 24px;
    text-align: center;
}

.omni-item-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text);
}

.omni-item-desc {
    font-size: 12px;
    color: var(--muted);
}

.omni-item-badge {
    font-size: 10px;
    font-weight: 700;
    padding: 2px 6px;
    border-radius: 6px;
    background: var(--surface-3);
    color: var(--muted);
    text-transform: uppercase;
}

.omni-footer {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 10px 20px;
    background: var(--surface-2);
    border-top: 1px solid var(--line);
    font-size: 11px;
    color: var(--muted);
}

/* ============================================================
   REGRESSION HUD & MINI SELECT
   ============================================================ */
.chart-mini-select {
    padding: 6px 12px;
    border-radius: 980px;
    background: var(--surface-2);
    border: 1px solid var(--line);
    color: var(--text);
    font-size: 12px;
    font-weight: 600;
    outline: none;
    cursor: pointer;
}

.regression-hud-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    padding: 10px 16px;
    margin: 8px 16px 14px 16px;
    background: var(--surface-2);
    border: 1px solid var(--line);
    border-radius: 12px;
}

.reg-pill {
    font-size: 12px;
    color: var(--muted);
}

.reg-pill strong {
    color: var(--apple-orange);
}

.reg-pill span {
    color: var(--text);
    font-family: ui-monospace, monospace;
}

/* ============================================================
   GEOMETRY & TRIANGLES STUDIO
   ============================================================ */
.geometry-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 20px;
}

.triangle-solver-card {
    grid-column: 1 / -1;
}

/* ============================================================
   ELECTRONICS & CIRCUITS STUDIO
   ============================================================ */
.circuits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 20px;
}

.resistor-decoder-card {
    grid-column: 1 / -1;
}

/* ============================================================
   COLOR SCIENCE & WCAG CONTRAST STUDIO
   ============================================================ */
.color-science-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 14px;
}

@media (max-width: 768px) {
    .color-science-grid {
        grid-template-columns: 1fr;
    }
}

.color-input-cluster {
    display: flex;
    align-items: center;
    gap: 10px;
}

.color-swatch-input {
    width: 44px;
    height: 38px;
    border-radius: 8px;
    border: 1px solid var(--line);
    background: transparent;
    cursor: pointer;
    padding: 0;
}

.color-hex-text {
    flex: 1;
    font-family: ui-monospace, monospace;
    text-transform: uppercase;
}

.color-preview-card {
    border-radius: 14px;
    padding: 20px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    min-height: 120px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all 0.2s ease;
}

.cp-title {
    font-size: 17px;
    font-weight: 700;
    margin-bottom: 4px;
}

.cp-sub {
    font-size: 13px;
    opacity: 0.9;
    margin-bottom: 14px;
}

.cp-badges {
    display: flex;
    gap: 8px;
}

.wcag-badge {
    padding: 3px 8px;
    border-radius: 6px;
    font-size: 11px;
    font-weight: 700;
}

.wcag-badge.pass {
    background: rgba(48, 209, 88, 0.2);
    color: #30d158;
    border: 1px solid rgba(48, 209, 88, 0.4);
}

.wcag-badge.fail {
    background: rgba(255, 69, 58, 0.2);
    color: #ff453a;
    border: 1px solid rgba(255, 69, 58, 0.4);
}

/* ============================================================
   BACKUP MODAL ACTIONS GRID
   ============================================================ */
.backup-actions-grid {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        scroll-behavior: auto !important;
        transition-duration: 0.01ms !important;
    }
}