:root {
    /* MD3 Color Tokens - Light (Default Seed) */
    --md-sys-color-primary: #6750A4;
    --md-sys-color-on-primary: #FFFFFF;
    --md-sys-color-primary-container: #EADDFF;
    --md-sys-color-on-primary-container: #21005D;
    --md-sys-color-secondary: #625B71;
    --md-sys-color-on-secondary: #FFFFFF;
    --md-sys-color-surface: #FEF7FF;
    --md-sys-color-on-surface: #1D1B20;
    --md-sys-color-surface-variant: #E7E0EB;
    --md-sys-color-on-surface-variant: #49454F;
    --md-sys-color-outline: #79747E;
    --md-sys-color-outline-variant: #CAC4D0;
    --md-sys-color-shadow: rgba(0, 0, 0, 0.1);
    --md-sys-color-secondary-container: #E8DEF8;
    --md-sys-color-on-secondary-container: #1D192B;
    --md-sys-color-tertiary: #7D5260;
    --md-sys-color-surface-container-low: #F7F2FA;
    --md-sys-color-surface-container: #F3EDF7;
    --md-sys-color-surface-container-high: #ECE6F0;
    --md-sys-color-surface-container-highest: #E6E0E9;

    /* MD3 Typography */
    --md-sys-typescale-headline-medium-font: 'Outfit', sans-serif;
    --md-sys-typescale-headline-medium-size: 1.75rem;
    --md-sys-typescale-title-medium-font: 'Outfit', sans-serif;
    --md-sys-typescale-title-medium-size: 1.25rem;
    --md-sys-typescale-body-medium-font: 'Roboto', sans-serif;
    --md-sys-typescale-body-medium-size: 0.875rem;

    /* MD3 Shapes */
    --md-sys-shape-corner-extra-large: 28px;
    --md-sys-shape-corner-medium: 12px;
    --md-sys-shape-corner-full: 999px;

    /* Spacing */
    --spacing-xs: 4px;
    --spacing-s: 8px;
    --spacing-m: 16px;
    --spacing-l: 24px;
    --spacing-xl: 32px;

    /* Transitions */
    --transition-standard: 200ms cubic-bezier(0.2, 0, 0, 1);
}

.dark-mode {
    --md-sys-color-primary: #D0BCFF;
    --md-sys-color-on-primary: #381E72;
    --md-sys-color-primary-container: #4F378B;
    --md-sys-color-on-primary-container: #EADDFF;
    --md-sys-color-surface: #141218;
    --md-sys-color-on-surface: #E6E1E5;
    --md-sys-color-surface-variant: #49454F;
    --md-sys-color-on-surface-variant: #CAC4D0;
    --md-sys-color-outline: #938F99;
    --md-sys-color-outline-variant: #49454F;
    --md-sys-color-shadow: rgba(0, 0, 0, 0.5);
    --md-sys-color-secondary-container: #4A4458;
    --md-sys-color-on-secondary-container: #E8DEF8;
    --md-sys-color-surface-container: #211F26;
    --md-sys-color-surface-container-high: #2B2930;
    --md-sys-color-surface-container-highest: #36343B;
}

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

body {
    background-color: var(--md-sys-color-surface);
    color: var(--md-sys-color-on-surface);
    font-family: var(--md-sys-typescale-body-medium-font);
    line-height: 1.5;
    transition: background-color var(--transition-standard), color var(--transition-standard);
    min-height: 100vh;
}

/* Typography */
.headline-medium {
    font-family: var(--md-sys-typescale-headline-medium-font);
    font-size: var(--md-sys-typescale-headline-medium-size);
    font-weight: 500;
}

.title-medium {
    font-family: var(--md-sys-typescale-title-medium-font);
    font-size: var(--md-sys-typescale-title-medium-size);
    font-weight: 500;
    margin-bottom: var(--spacing-m);
}

.label-large { font-weight: 500; font-size: 0.875rem; }
.label-small { font-weight: 500; font-size: 0.75rem; opacity: 0.8; }

/* Top App Bar */
.top-app-bar {
    height: 64px;
    background-color: var(--md-sys-color-surface);
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    padding: 0 var(--spacing-m);
}

.header-content {
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.app-bar-actions {
    display: flex;
    gap: var(--spacing-s);
    align-items: center;
}

/* Dropdown Menu */
.dropdown {
    position: relative;
    display: inline-block;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 8px;
    background-color: var(--md-sys-color-surface-container-highest);
    border-radius: var(--md-sys-shape-corner-medium);
    box-shadow: 0 8px 24px rgba(0,0,0,0.25);
    min-width: 180px;
    padding: 8px 0;
    display: none;
    z-index: 2000;
    animation: menuFadeIn 0.2s ease-out;
    border: 1px solid var(--md-sys-color-outline-variant);
    overflow: hidden;
}

.dropdown-menu.show {
    display: block;
}

@keyframes menuFadeIn {
    from { opacity: 0; transform: translateY(-8px) scale(0.97); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

.menu-item {
    width: 100%;
    padding: 12px 20px;
    border: none;
    background: none;
    text-align: left;
    cursor: pointer;
    font-family: inherit;
    font-size: 0.9rem;
    color: var(--md-sys-color-on-surface);
    display: flex;
    align-items: center;
    gap: 12px;
    transition: background-color 0.15s;
    letter-spacing: 0.02em;
}

.menu-item:hover {
    background-color: var(--md-sys-color-surface-variant);
}

.menu-item.active {
    color: var(--md-sys-color-primary);
    font-weight: 600;
    background-color: var(--md-sys-color-primary-container);
}

.menu-item.active::before {
    content: '✓';
    font-size: 0.8rem;
    flex-shrink: 0;
    width: 16px;
}

.menu-item:not(.active)::before {
    content: '';
    width: 16px;
    flex-shrink: 0;
}

/* Main Layout */
.main-container {
    display: grid;
    grid-template-columns: 350px 1fr 350px;
    gap: var(--spacing-l);
    padding: var(--spacing-l);
    max-width: 1600px;
    margin: 0 auto;
    align-items: start;
}

@media (max-width: 1280px) {
    .main-container {
        grid-template-columns: 350px 1fr;
    }
    #col-discovery {
        grid-column: span 2;
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-l);
    }
}

@media (max-width: 900px) {
    .main-container {
        grid-template-columns: 1fr;
    }
    #col-discovery {
        grid-column: span 1;
        grid-template-columns: 1fr;
    }
}

/* Cards */
.card {
    border-radius: var(--md-sys-shape-corner-extra-large);
    padding: var(--spacing-l);
    height: fit-content;
    transition: transform var(--transition-standard), box-shadow var(--transition-standard);
}

.card-filled {
    background-color: var(--md-sys-color-surface-variant);
    color: var(--md-sys-color-on-surface-variant);
}

.card-outlined {
    border: 1px solid var(--md-sys-color-outline);
}

.card-elevated {
    background-color: var(--md-sys-color-surface);
    box-shadow: 0 4px 12px var(--md-sys-color-shadow);
}

.card-tonal {
    background-color: var(--md-sys-color-secondary-container);
    color: var(--md-sys-color-on-secondary-container);
}

/* Column 1 Specifics */
.color-input-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-m);
    margin-bottom: var(--spacing-l);
}

.main-preview {
    width: 100%;
    height: 120px;
    background-color: var(--md-sys-color-primary);
    box-shadow: inset 0 0 0 1px rgba(0,0,0,0.1);
    transition: background-color var(--transition-standard);
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.color-name-overlay {
    background: rgba(0,0,0,0.4);
    color: white;
    padding: 4px 12px;
    border-radius: var(--md-sys-shape-corner-full);
    font-size: 0.75rem;
    font-weight: 500;
    backdrop-filter: blur(4px);
    pointer-events: none;
}

.input-group {
    width: 100%;
}

.hex-wrapper {
    display: flex;
    align-items: center;
    background: var(--md-sys-color-surface);
    border: 1px solid var(--md-sys-color-outline);
    border-radius: var(--md-sys-shape-corner-medium);
    padding: var(--spacing-s) var(--spacing-m);
    gap: var(--spacing-xs);
    margin-top: var(--spacing-xs);
    position: relative;
}

.hex-wrapper input[type="text"] {
    background: transparent;
    border: none;
    outline: none;
    color: inherit;
    font-family: 'Outfit', sans-serif;
    font-size: 1.25rem;
    width: calc(100% - 40px);
}

.hex-wrapper input[type="color"] {
    position: absolute;
    right: 8px;
    width: 32px;
    height: 32px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    background: transparent;
}

/* Mixer Styles */
.mixer-row {
    display: flex;
    gap: var(--spacing-s);
}

.mixer-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.mixer-item input {
    width: 100%;
    background: var(--md-sys-color-surface);
    border: 1px solid var(--md-sys-color-outline);
    border-radius: 8px;
    padding: 6px;
    font-family: inherit;
    font-size: 0.9rem;
    text-align: center;
}

.label-tiny {
    font-size: 10px;
    font-weight: 700;
    opacity: 0.7;
    text-align: center;
}

/* UI Samples */
.ui-samples-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-m);
}

.ui-sample-item {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.sample-btn-primary {
    background-color: var(--md-sys-color-primary);
    color: white;
    border: none;
    padding: 10px;
    border-radius: 20px;
    font-weight: 500;
}

.sample-btn-outline {
    background-color: transparent;
    color: var(--md-sys-color-primary);
    border: 1px solid var(--md-sys-color-primary);
    padding: 10px;
    border-radius: 20px;
    font-weight: 500;
}

.sample-card {
    background-color: var(--md-sys-color-surface-container-low);
    border: 1px solid var(--md-sys-color-outline);
    border-radius: 12px;
    padding: 12px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.sample-dot {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background-color: var(--md-sys-color-primary);
}

.sample-text {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--md-sys-color-primary);
}

/* Color Blindness Grid */
.cb-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-s);
}

.cb-item {
    background: var(--md-sys-color-surface);
    padding: 8px;
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.cb-preview {
    height: 40px;
    border-radius: 6px;
}

/* Code Outputs */
.code-outputs {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-s);
}

.code-card {
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--md-sys-shape-corner-medium);
    padding: var(--spacing-s) var(--spacing-m);
    display: flex;
    flex-direction: column;
}

.code-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

code {
    font-family: monospace;
    font-size: 1rem;
}

/* Buttons */
.icon-button {
    width: 48px;
    height: 48px;
    border-radius: var(--md-sys-shape-corner-full);
    border: none;
    background: transparent;
    color: var(--md-sys-color-on-surface);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background-color var(--transition-standard);
}

.icon-button:hover {
    background-color: rgba(103, 80, 164, 0.08);
}

.small-btn {
    width: 32px;
    height: 32px;
}

/* Variations (Column 2) */
.variation-section {
    margin-bottom: var(--spacing-xl);
}

.variation-section:last-child { margin-bottom: 0; }

.color-row-scroll {
    display: flex;
    gap: var(--spacing-s);
    overflow-x: auto;
    padding: var(--spacing-s) 2px;
    padding-bottom: var(--spacing-m);
    scrollbar-width: thin;
    scrollbar-color: var(--md-sys-color-outline) transparent;
    cursor: grab;
}

.color-row-scroll:active {
    cursor: grabbing;
}

/* Webkit scrollbar (Chrome, Edge, Safari) */
.color-row-scroll::-webkit-scrollbar {
    height: 6px;
    display: block;
}

.color-row-scroll::-webkit-scrollbar-track {
    background: var(--md-sys-color-surface-variant);
    border-radius: 999px;
    margin: 0 4px;
}

.color-row-scroll::-webkit-scrollbar-thumb {
    background-color: var(--md-sys-color-outline);
    border-radius: 999px;
}

.color-row-scroll::-webkit-scrollbar-thumb:hover {
    background-color: var(--md-sys-color-primary);
}

.variant-box {
    flex: 0 0 60px;
    height: 80px;
    border-radius: var(--md-sys-shape-corner-medium);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-end;
    padding-bottom: 8px;
    cursor: pointer;
    transition: transform var(--transition-standard);
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.variant-box:hover {
    transform: translateY(-4px);
}

.variant-box .label-tiny {
    font-size: 10px;
    font-weight: 700;
}

/* Harmonies (Column 3) */
#harmonies-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-l);
}

.harmony-group {
    background: var(--md-sys-color-surface-variant);
    padding: var(--spacing-m);
    border-radius: var(--md-sys-shape-corner-medium);
}

.harmony-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-s);
}

.harmony-colors {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(50px, 1fr));
    gap: var(--spacing-s);
}

.harmony-box {
    aspect-ratio: 1;
    border-radius: 8px;
    position: relative;
    cursor: pointer;
    transition: transform var(--transition-standard);
}

.harmony-box:hover {
    transform: scale(1.1);
    z-index: 1;
}

/* WCAG Section */
.wcag-section {
    border-top: 1px solid var(--md-sys-color-outline);
    padding-top: var(--spacing-m);
    margin-top: var(--spacing-m);
}

.wcag-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-m);
    margin-top: var(--spacing-s);
}

.wcag-result-row {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.badges {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
}

.badge {
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 10px;
    font-weight: 700;
    text-transform: uppercase;
}

.badge-pass { background: #4CAF50; color: white; }
.badge-fail { background: #F44336; color: white; opacity: 0.5; }

/* Modal */
.modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal-backdrop.show { display: flex; }

.modal-card {
    background: var(--md-sys-color-surface);
    width: 90%;
    max-width: 600px;
    border-radius: var(--md-sys-shape-corner-extra-large);
    padding: var(--spacing-l);
    box-shadow: 0 10px 40px rgba(0,0,0,0.3);
    max-height: 80vh;
    display: flex;
    flex-direction: column;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-m);
}

.modal-tabs {
    display: flex;
    gap: var(--spacing-s);
    margin-bottom: var(--spacing-m);
    border-bottom: 1px solid var(--md-sys-color-outline);
}

.tab-btn {
    background: transparent;
    border: none;
    padding: var(--spacing-s) var(--spacing-m);
    cursor: pointer;
    color: var(--md-sys-color-on-surface);
    font-weight: 500;
    position: relative;
}

.tab-btn.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--md-sys-color-primary);
    border-radius: 3px 3px 0 0;
}

.modal-body {
    overflow-y: auto;
    background: var(--md-sys-color-surface-variant);
    border-radius: var(--md-sys-shape-corner-medium);
    padding: var(--spacing-m);
    flex-grow: 1;
}

.tab-content { display: none; }
.tab-content.active { display: block; }

pre {
    margin: 0;
    white-space: pre-wrap;
    word-break: break-all;
    font-family: monospace;
    font-size: 13px;
}

.modal-footer {
    padding-top: var(--spacing-m);
    display: flex;
    justify-content: flex-end;
}

.button-filled {
    background: var(--md-sys-color-primary);
    color: var(--md-sys-color-on-primary);
    border: none;
    padding: var(--spacing-s) var(--spacing-l);
    border-radius: var(--md-sys-shape-corner-full);
    display: flex;
    align-items: center;
    gap: var(--spacing-s);
    cursor: pointer;
    font-weight: 500;
}

.button-tonal {
    background: var(--md-sys-color-secondary-container);
    color: var(--md-sys-color-on-secondary-container);
    border: none;
    padding: var(--spacing-s) var(--spacing-l);
    border-radius: var(--md-sys-shape-corner-full);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-s);
    cursor: pointer;
    font-weight: 500;
    transition: background-color var(--transition-standard);
}

.button-tonal:hover {
    background-color: rgba(103, 80, 164, 0.12);
}

.full-width { width: 100%; }

.best-text-preview {
    width: 100%;
    height: 80px;
    border-radius: var(--md-sys-shape-corner-medium);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    font-weight: 700;
    margin-top: var(--spacing-s);
    border: 1px solid var(--md-sys-color-outline);
}

.palette-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: var(--spacing-s);
    margin-top: var(--spacing-s);
}

@media (max-width: 480px) {
    .palette-grid {
        grid-template-columns: repeat(5, 1fr); /* Keep 5 for compactness, or 1fr if labels needed */
    }
}

.palette-item {
    aspect-ratio: 1;
    border-radius: var(--md-sys-shape-corner-full);
    cursor: pointer;
    position: relative;
    transition: transform var(--transition-standard);
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

.palette-item:hover { transform: scale(1.1); }

.palette-item .remove-btn {
    position: absolute;
    top: -4px;
    right: -4px;
    width: 16px;
    height: 16px;
    background: #F44336;
    color: white;
    border-radius: 50%;
    font-size: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--transition-standard);
}

.palette-item:hover .remove-btn { opacity: 1; }

.mt-m { margin-top: var(--spacing-m); }

.mt-l { margin-top: var(--spacing-l); }
.mb-0 { margin-bottom: 0 !important; }

/* Guide Content */
.guide-body {
    padding-right: var(--spacing-m);
}

.guide-section {
    margin-bottom: var(--spacing-l);
}

.guide-section:last-child {
    margin-bottom: 0;
}

.guide-section h3 {
    color: var(--md-sys-color-primary);
    margin-bottom: var(--spacing-s);
}

.guide-list {
    list-style: none;
    margin-top: var(--spacing-s);
}

.guide-list li {
    margin-bottom: 6px;
    font-size: 0.875rem;
}

.guide-list strong {
    color: var(--md-sys-color-on-surface);
}

/* Toast */
.toast {
    position: fixed;
    bottom: var(--spacing-xl);
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background-color: var(--md-sys-color-on-surface);
    color: var(--md-sys-color-surface);
    padding: var(--spacing-m) var(--spacing-xl);
    border-radius: var(--md-sys-shape-corner-full);
    transition: transform 0.3s ease-out;
    z-index: 1000;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
}