@import url('https://fonts.googleapis.com/css2?family=Familjen+Grotesk:wght@400;500;600;700&family=DM+Mono:wght@400;500&display=swap');

:root {
    /* Core palette */
    --bg-base: #0c0e14;
    --bg-raised: #13151d;
    --bg-surface: #1a1d28;
    --bg-surface-hover: #21252f;
    --bg-overlay: rgba(26, 29, 40, 0.85);

    /* Accent */
    --accent: #e8a634;
    --accent-dim: #c48a1e;
    --accent-glow: rgba(232, 166, 52, 0.15);
    --accent-text: #f5c563;

    /* Semantic */
    --success: #34d399;
    --success-bg: rgba(52, 211, 153, 0.12);
    --danger: #f87171;
    --danger-bg: rgba(248, 113, 113, 0.12);

    /* Text */
    --text-primary: #e8eaed;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;

    /* Borders */
    --border: rgba(255, 255, 255, 0.06);
    --border-accent: rgba(232, 166, 52, 0.25);

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 40px rgba(232, 166, 52, 0.08);

    /* Radius */
    --radius: 14px;
    --radius-sm: 8px;
    --radius-xs: 5px;

    /* Typography */
    --font-display: 'Familjen Grotesk', system-ui, sans-serif;
    --font-mono: 'DM Mono', 'Consolas', monospace;

    /* Transitions */
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

/* ---- Light theme ---- */

[data-theme="light"] {
    --bg-base: #f4f2ee;
    --bg-raised: #ffffff;
    --bg-surface: #edeae4;
    --bg-surface-hover: #e4e0d8;
    --bg-overlay: rgba(255, 255, 255, 0.9);

    --accent: #c47a15;
    --accent-dim: #a86510;
    --accent-glow: rgba(196, 122, 21, 0.1);
    --accent-text: #9a5d0a;

    --success: #16a34a;
    --success-bg: rgba(22, 163, 74, 0.1);
    --danger: #dc2626;
    --danger-bg: rgba(220, 38, 38, 0.1);

    --text-primary: #1c1917;
    --text-secondary: #57534e;
    --text-muted: #a8a29e;

    --border: rgba(0, 0, 0, 0.08);
    --border-accent: rgba(196, 122, 21, 0.3);

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.1);
    --shadow-glow: 0 0 40px rgba(196, 122, 21, 0.06);
}

[data-theme="light"] body::before {
    background:
        radial-gradient(ellipse 80% 50% at 20% 0%, rgba(196, 122, 21, 0.05) 0%, transparent 60%),
        radial-gradient(ellipse 60% 40% at 80% 100%, rgba(99, 102, 241, 0.04) 0%, transparent 60%),
        radial-gradient(ellipse 50% 60% at 50% 50%, rgba(196, 122, 21, 0.02) 0%, transparent 70%);
}

[data-theme="light"] .alpha-swatch {
    background-image:
        linear-gradient(45deg, #d4d4d4 25%, transparent 25%),
        linear-gradient(-45deg, #d4d4d4 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #d4d4d4 75%),
        linear-gradient(-45deg, transparent 75%, #d4d4d4 75%);
}

[data-theme="light"] .header h1 svg {
    filter: drop-shadow(0 0 8px rgba(196, 122, 21, 0.25));
}

/* ---- Theme toggle (toggles.dev classic) ---- */

.theme-toggle {
    --theme-toggle__classic--duration: 500ms;
    border: none;
    background: 0 0;
    cursor: pointer;
    color: var(--text-secondary);
    font-size: 1.6rem;
    padding: 0.35rem;
    border-radius: var(--radius-xs);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color 0.2s;
}

.theme-toggle:hover {
    color: var(--accent);
}

.theme-toggle__classic path {
    transition-timing-function: cubic-bezier(0, 0, 0.15, 1.25);
    transform-origin: center;
    transition-duration: calc(var(--theme-toggle__classic--duration) * 0.8);
}

.theme-toggle__classic g path {
    transition-property: opacity, transform;
    transition-delay: calc(var(--theme-toggle__classic--duration) * 0.2);
}

.theme-toggle__classic :first-child path {
    transition-property: transform, d;
}

.theme-toggle--toggled:not(label).theme-toggle .theme-toggle__classic g path {
    transform: scale(0.5) rotate(45deg);
    opacity: 0;
    transition-delay: 0s;
}

.theme-toggle--toggled:not(label).theme-toggle .theme-toggle__classic :first-child path {
    d: path("M-12 5h30a1 1 0 0 0 9 13v24h-39Z");
    transition-delay: calc(var(--theme-toggle__classic--duration) * 0.2);
}

@supports not (d: path("")) {
    .theme-toggle--toggled:not(label).theme-toggle .theme-toggle__classic :first-child path {
        transform: translate3d(-12px, 10px, 0);
    }
}

@media (prefers-reduced-motion: reduce) {
    .theme-toggle:not(.theme-toggle--force-motion) * {
        transition: none !important;
    }
}

/* ---- Reset ---- */

*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

button {
    border: none;
    background: none;
    font: inherit;
    color: inherit;
    cursor: pointer;
}

/* ---- Base ---- */

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-display);
    background: var(--bg-base);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color 0.35s, color 0.35s;
}

/* Atmospheric background */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    background:
        radial-gradient(ellipse 80% 50% at 20% 0%, rgba(232, 166, 52, 0.06) 0%, transparent 60%),
        radial-gradient(ellipse 60% 40% at 80% 100%, rgba(99, 102, 241, 0.05) 0%, transparent 60%),
        radial-gradient(ellipse 50% 60% at 50% 50%, rgba(232, 166, 52, 0.02) 0%, transparent 70%);
    pointer-events: none;
    z-index: 0;
}

/* ---- Skip link ---- */

.skip-link {
    position: absolute;
    top: -100%;
    left: 1rem;
    background: var(--accent);
    color: var(--bg-base);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
    z-index: 1000;
    text-decoration: none;
}

.skip-link:focus {
    top: 1rem;
}

/* ---- Layout ---- */

.container {
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 1.5rem;
    position: relative;
    z-index: 1;
}

/* ---- Header ---- */

.header {
    padding: 3rem 0 2.5rem;
    margin-bottom: 2rem;
    border-bottom: 1px solid var(--border);
    background: linear-gradient(180deg, rgba(232, 166, 52, 0.04) 0%, transparent 100%);
}

.header-content {
    text-align: center;
}

.header h1 {
    font-family: var(--font-display);
    font-size: 3.2rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.6rem;
    margin-bottom: 0.6rem;
}

.header h1 svg {
    width: 44px;
    height: 44px;
    stroke: var(--accent);
    filter: drop-shadow(0 0 12px rgba(232, 166, 52, 0.3));
}

.header h1 svg circle[fill="currentColor"] {
    fill: var(--accent);
}

.tagline {
    font-size: 1.15rem;
    color: var(--text-secondary);
    margin-bottom: 1.8rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.5;
}

.header-links {
    display: flex;
    gap: 0.75rem;
    justify-content: center;
    align-items: center;
}

.header-links .theme-toggle {
    margin-left: 0.25rem;
}

/* ---- Buttons ---- */

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.65rem 1.4rem;
    border-radius: var(--radius-sm);
    text-decoration: none;
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 0.9rem;
    letter-spacing: 0.01em;
    transition: all 0.25s var(--ease-out);
    border: 1px solid transparent;
    cursor: pointer;
}

.btn svg {
    width: 18px;
    height: 18px;
}

.btn-primary {
    background: var(--accent);
    color: var(--bg-base);
    border-color: var(--accent);
}

.btn-primary:hover {
    background: var(--accent-dim);
    border-color: var(--accent-dim);
    transform: translateY(-1px);
    box-shadow: 0 4px 20px rgba(232, 166, 52, 0.25);
}

.btn-secondary {
    background: var(--bg-surface);
    color: var(--text-primary);
    border-color: var(--border);
}

.btn-secondary:hover {
    background: var(--bg-surface-hover);
    border-color: rgba(255, 255, 255, 0.12);
}

/* ---- Navigation ---- */

.section-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
    margin-bottom: 3rem;
    padding: 1.25rem;
    background: var(--bg-raised);
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

.section-nav a {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.4rem 0.9rem;
    border-radius: var(--radius-xs);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.82rem;
    font-weight: 500;
    transition: all 0.2s var(--ease-out);
    border: 1px solid transparent;
}

.section-nav a svg {
    width: 14px;
    height: 14px;
    opacity: 0.6;
}

.section-nav a:hover {
    color: var(--accent-text);
    background: var(--accent-glow);
    border-color: var(--border-accent);
}

/* ---- Sections ---- */

.section {
    margin-bottom: 3rem;
    animation: fadeInUp 0.5s var(--ease-out) both;
}

.section:nth-child(2) { animation-delay: 0.05s; }
.section:nth-child(3) { animation-delay: 0.1s; }
.section:nth-child(4) { animation-delay: 0.15s; }
.section:nth-child(5) { animation-delay: 0.2s; }
.section:nth-child(6) { animation-delay: 0.25s; }
.section:nth-child(7) { animation-delay: 0.3s; }
.section:nth-child(8) { animation-delay: 0.35s; }
.section:nth-child(9) { animation-delay: 0.4s; }
.section:nth-child(10) { animation-delay: 0.45s; }

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(16px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.section h2 {
    font-family: var(--font-display);
    font-size: 1.6rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    margin-bottom: 1.25rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.65rem;
}

.section h2 svg {
    width: 26px;
    height: 26px;
    stroke: var(--accent);
    flex-shrink: 0;
}

/* ---- Cards ---- */

.card {
    background: var(--bg-raised);
    border-radius: var(--radius);
    padding: 1.75rem;
    border: 1px solid var(--border);
    transition: background-color 0.35s, border-color 0.3s var(--ease-out), box-shadow 0.3s var(--ease-out);
}

.card:hover {
    border-color: rgba(255, 255, 255, 0.1);
    box-shadow: var(--shadow-glow);
}

/* ---- Inputs ---- */

.input-group {
    margin-bottom: 1.25rem;
}

.input-group label {
    display: block;
    margin-bottom: 0.4rem;
    font-weight: 500;
    font-size: 0.88rem;
    color: var(--text-secondary);
    letter-spacing: 0.01em;
}

.input-group input[type="color"] {
    width: 100%;
    height: 52px;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    background: var(--bg-surface);
    transition: border-color 0.2s;
}

.input-group input[type="color"]:hover {
    border-color: var(--border-accent);
}

.input-group input[type="range"] {
    width: calc(100% - 55px);
    margin-right: 0.75rem;
    accent-color: var(--accent);
    height: 6px;
}

.input-group span {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--accent-text);
}

.input-group select {
    width: 100%;
    padding: 0.65rem 0.85rem;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    font-family: var(--font-display);
    font-size: 0.9rem;
    background: var(--bg-surface);
    color: var(--text-primary);
    cursor: pointer;
    transition: border-color 0.2s;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%239ca3af' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    padding-right: 2rem;
}

.input-group select:hover,
.input-group select:focus {
    border-color: var(--border-accent);
    outline: none;
}

/* ---- Color Picker Section ---- */

.color-picker-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.75rem;
}

.color-display {
    height: 180px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    font-weight: 700;
    box-shadow: var(--shadow-md);
    position: relative;
    overflow: hidden;
}

.color-display::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: var(--radius-sm);
    border: 1px solid rgba(255, 255, 255, 0.1);
    pointer-events: none;
}

.conversions {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 0.75rem;
}

.conversion-item {
    background: var(--bg-surface);
    padding: 1rem;
    border-radius: var(--radius-sm);
    text-align: center;
    border: 1px solid var(--border);
}

.conversion-item strong {
    display: block;
    margin-bottom: 0.4rem;
    color: var(--text-muted);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.conversion-item code {
    font-family: var(--font-mono);
    background: var(--bg-base);
    padding: 0.4rem 0.6rem;
    border-radius: var(--radius-xs);
    display: block;
    font-size: 0.85rem;
    color: var(--accent-text);
    word-break: break-all;
}

/* ---- Blending Section ---- */

.blend-controls {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.75rem;
    margin-bottom: 1.75rem;
}

.blend-results {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
}

.blend-item {
    text-align: center;
}

.blend-item h4 {
    margin-bottom: 0.6rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
}

.blend-swatch {
    height: 90px;
    border-radius: var(--radius-sm);
    margin-bottom: 0.5rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

/* ---- Tints, Shades, Tones ---- */

.tst-grid {
    display: grid;
    gap: 1.75rem;
    margin-top: 1.5rem;
}

.tst-section h4 {
    margin-bottom: 0.75rem;
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 500;
}

.tst-swatches {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(70px, 1fr));
    gap: 0.5rem;
}

.tst-swatch {
    aspect-ratio: 1;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-sm);
    display: flex;
    align-items: flex-end;
    justify-content: center;
    padding: 0.4rem;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 500;
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.5);
    transition: transform 0.2s var(--ease-out);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.tst-swatch:hover {
    transform: scale(1.08);
    z-index: 1;
}

/* ---- Gradient Section ---- */

.gradient-controls {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    margin-bottom: 1.75rem;
}

.gradient-display {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(40px, 1fr));
    gap: 0;
    height: 72px;
    border-radius: var(--radius-sm);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    margin-bottom: 1rem;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.gradient-step {
    height: 100%;
    position: relative;
    transition: transform 0.15s var(--ease-out);
}

.gradient-step:hover {
    transform: scaleY(1.12);
    z-index: 1;
}

.gradient-step:hover::after {
    content: attr(data-color);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-base);
    color: var(--accent-text);
    padding: 0.2rem 0.5rem;
    border-radius: var(--radius-xs);
    font-family: var(--font-mono);
    font-size: 0.7rem;
    white-space: nowrap;
    margin-bottom: 0.3rem;
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
}

/* ---- Alpha Blending ---- */

.alpha-controls {
    display: grid;
    gap: 1.25rem;
    margin-bottom: 1.5rem;
}

.alpha-result {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 1.25rem;
    margin-top: 1.5rem;
}

.alpha-preview {
    text-align: center;
}

.alpha-preview h4 {
    margin-bottom: 0.6rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
}

.alpha-swatch {
    height: 110px;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-sm);
    margin-bottom: 0.5rem;
    background-image:
        linear-gradient(45deg, #2a2a2a 25%, transparent 25%),
        linear-gradient(-45deg, #2a2a2a 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #2a2a2a 75%),
        linear-gradient(-45deg, transparent 75%, #2a2a2a 75%);
    background-size: 16px 16px;
    background-position: 0 0, 0 8px, 8px -8px, -8px 0px;
    position: relative;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.alpha-swatch-inner {
    width: 100%;
    height: 100%;
    border-radius: var(--radius-sm);
}

/* ---- Delta E ---- */

.delta-controls {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.75rem;
    margin-bottom: 1.5rem;
}

.delta-result {
    text-align: center;
    padding: 2rem;
    background: var(--bg-surface);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
}

.delta-result h3 {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.delta-value {
    font-family: var(--font-mono);
    font-size: 3.5rem;
    font-weight: 500;
    color: var(--accent);
    margin: 0.75rem 0;
    letter-spacing: -0.03em;
}

.delta-interpretation {
    font-size: 1.05rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
}

.delta-colors {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
    margin-top: 1.5rem;
}

/* ---- Kelvin ---- */

.kelvin-display {
    text-align: center;
    padding: 1.5rem;
    margin: 1.5rem 0;
}

.kelvin-swatch-container {
    margin-bottom: 1.5rem;
}

.kelvin-info {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
    margin-top: 1rem;
}

.kelvin-info-item {
    background: var(--bg-surface);
    padding: 0.85rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
}

.kelvin-info-item strong {
    display: block;
    margin-bottom: 0.3rem;
    color: var(--text-muted);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.kelvin-presets {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
    gap: 0.75rem;
    margin-top: 1.5rem;
}

.kelvin-preset {
    background: var(--bg-surface);
    padding: 0.85rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.25s var(--ease-out);
    text-align: center;
    border: 1px solid var(--border);
}

.kelvin-preset:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: var(--border-accent);
}

.kelvin-preset-swatch {
    height: 50px;
    border-radius: var(--radius-xs);
    margin-bottom: 0.5rem;
    box-shadow: var(--shadow-sm);
}

.kelvin-preset strong {
    display: block;
    margin-bottom: 0.15rem;
    font-size: 0.88rem;
    color: var(--text-primary);
}

.kelvin-preset div:last-child {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    color: var(--text-muted);
}

/* ---- Contrast / Accessibility ---- */

.contrast-controls {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.75rem;
    margin-bottom: 1.5rem;
}

.contrast-result {
    display: grid;
    gap: 1.5rem;
}

.contrast-ratio-display {
    text-align: center;
    padding: 1.75rem;
    background: var(--bg-surface);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
}

.contrast-ratio-value {
    font-family: var(--font-mono);
    font-size: 3rem;
    font-weight: 500;
    color: var(--accent);
    letter-spacing: -0.03em;
}

.contrast-wcag {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.75rem;
}

.wcag-item {
    padding: 1rem;
    border-radius: var(--radius-sm);
    text-align: center;
    border: 1px solid transparent;
}

.wcag-item strong {
    display: block;
    font-size: 0.8rem;
    letter-spacing: 0.03em;
    margin-bottom: 0.2rem;
}

.wcag-item div {
    font-size: 0.82rem;
}

.wcag-item__result {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-top: 0.4rem;
    font-weight: 600;
    font-size: 0.85rem;
}

.wcag-item.pass {
    background: var(--success-bg);
    color: var(--success);
    border-color: rgba(52, 211, 153, 0.2);
}

.wcag-item.fail {
    background: var(--danger-bg);
    color: var(--danger);
    border-color: rgba(248, 113, 113, 0.2);
}

.wcag-item svg {
    width: 16px;
    height: 16px;
    vertical-align: middle;
    margin-right: 3px;
}

.contrast-preview {
    padding: 1.75rem;
    border-radius: var(--radius-sm);
    text-align: center;
    font-size: 1.3rem;
    font-weight: 600;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

/* ---- Harmony ---- */

.harmony-grid {
    display: grid;
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.harmony-section h4 {
    margin-bottom: 0.6rem;
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 500;
}

.harmony-swatches {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

/* ---- Copyable Color ---- */

.copyable-color {
    padding: 0.65rem 0.85rem;
    gap: 6px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-family: var(--font-mono);
    font-weight: 500;
    font-size: 0.85rem;
    box-shadow: var(--shadow-sm);
    transition: transform 0.15s var(--ease-out), box-shadow 0.15s var(--ease-out);
    border: 1px solid rgba(255, 255, 255, 0.08);
    position: relative;
    overflow: hidden;
}

.copyable-color::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.06) 0%, transparent 60%);
    pointer-events: none;
}

.copyable-color:hover {
    transform: scale(1.03);
    box-shadow: var(--shadow-md);
}

.copyable-color:active {
    transform: scale(0.98);
}

.copyable-color svg {
    width: 16px;
    height: 16px;
}

.copyable-color__icon {
    opacity: 0.5;
    display: flex;
    align-items: center;
    transition: opacity 0.15s;
}

.copyable-color:hover .copyable-color__icon {
    opacity: 0.9;
}

/* ---- Footer ---- */

.footer {
    border-top: 1px solid var(--border);
    padding: 2.5rem 0;
    margin-top: 4rem;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.88rem;
    background: var(--bg-raised);
}

.footer p {
    margin-bottom: 0.5rem;
}

.footer p:last-child {
    margin-bottom: 0;
}

.footer svg {
    width: 14px;
    height: 14px;
    vertical-align: middle;
    stroke: var(--accent);
    fill: var(--accent);
}

.footer a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s;
}

.footer a:hover {
    color: var(--accent-text);
}

/* ---- Responsive ---- */

@media (max-width: 768px) {
    .header {
        padding: 2rem 0 1.5rem;
    }

    .header h1 {
        font-size: 2.2rem;
    }

    .header h1 svg {
        width: 32px;
        height: 32px;
    }

    .tagline {
        font-size: 1rem;
    }

    .section h2 {
        font-size: 1.3rem;
    }

    .section h2 svg {
        width: 22px;
        height: 22px;
    }

    .card {
        padding: 1.25rem;
    }

    .color-picker-grid,
    .blend-controls,
    .gradient-controls,
    .delta-controls,
    .contrast-controls {
        grid-template-columns: 1fr;
    }

    .blend-results {
        grid-template-columns: 1fr;
    }

    .alpha-result {
        grid-template-columns: 1fr;
    }

    .contrast-wcag {
        grid-template-columns: 1fr;
    }

    .kelvin-info {
        grid-template-columns: 1fr;
    }

    .header-links {
        flex-direction: column;
    }

    .section-nav {
        gap: 0.35rem;
        padding: 0.85rem;
    }

    .section-nav a {
        font-size: 0.75rem;
        padding: 0.35rem 0.7rem;
    }
}

@media (max-width: 480px) {
    .header h1 {
        font-size: 1.8rem;
    }

    .tst-swatches {
        grid-template-columns: repeat(auto-fit, minmax(55px, 1fr));
    }
}