/* ============================================
   Color Scale Generator — Purple Dark Theme
   ============================================ */
:root {
    --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --primary: #8b5cf6;
    --primary-rgb: 139, 92, 246;

    --bg: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-tertiary: #64748b;
    --border: rgba(148, 163, 184, 0.1);
    --glass-bg: rgba(30, 41, 59, 0.8);
    --glass-border: rgba(148, 163, 184, 0.08);
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    --gradient: linear-gradient(135deg, #8b5cf6, #a78bfa, #c4b5fd);
    --radius: 12px;
    --transition: 200ms ease;
}

[data-theme="light"] {
    --bg: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f1f5f9;
    --text: #0f172a;
    --text-secondary: #475569;
    --text-tertiary: #94a3b8;
    --border: rgba(15, 23, 42, 0.08);
    --glass-bg: rgba(255, 255, 255, 0.85);
    --glass-border: rgba(15, 23, 42, 0.06);
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    transition: background var(--transition), color var(--transition);
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 20px;
}

.icon {
    width: 18px;
    height: 18px;
}

.gradient-text {
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

/* Header */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 60px;
}

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

.logo-icon {
    font-size: 22px;
}

.logo-text {
    font-size: 1.05rem;
    font-weight: 700;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border: none;
    border-radius: 8px;
    font-family: var(--font);
    font-size: 0.82rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 150ms ease;
    white-space: nowrap;
}

.btn:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
}

.btn-ghost:hover {
    background: var(--bg-tertiary);
    color: var(--text);
}

.btn-sm {
    padding: 5px 10px;
    font-size: 0.78rem;
}

[data-theme="dark"] .sun-icon {
    display: block;
}

[data-theme="dark"] .moon-icon {
    display: none;
}

[data-theme="light"] .sun-icon {
    display: none;
}

[data-theme="light"] .moon-icon {
    display: block;
}

/* Hero */
.hero {
    text-align: center;
    padding: 44px 0 24px;
}

.hero-title {
    font-size: clamp(1.6rem, 5vw, 2.3rem);
    font-weight: 800;
    letter-spacing: -0.03em;
}

.hero-sub {
    font-size: 0.92rem;
    color: var(--text-secondary);
    margin-top: 8px;
}

/* Picker */
.picker-section {
    padding: 20px;
    margin-bottom: 24px;
}

.picker-row {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 16px;
}

.picker-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.picker-label {
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.color-input-wrap {
    display: flex;
    align-items: center;
    gap: 8px;
}

.color-picker {
    width: 44px;
    height: 44px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    padding: 0;
    background: none;
}

.color-picker::-webkit-color-swatch-wrapper {
    padding: 0;
}

.color-picker::-webkit-color-swatch {
    border: 2px solid var(--border);
    border-radius: 8px;
}

.hex-input {
    width: 100px;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--bg);
    color: var(--text);
    font-family: 'SF Mono', monospace;
    font-size: 0.85rem;
    text-transform: uppercase;
    outline: none;
}

.hex-input:focus {
    border-color: var(--primary);
}

.text-input,
.select-input {
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--bg);
    color: var(--text);
    font-family: var(--font);
    font-size: 0.85rem;
    outline: none;
}

.text-input:focus,
.select-input:focus {
    border-color: var(--primary);
}

/* Presets */
.presets {
    display: flex;
    align-items: center;
    gap: 6px;
    flex-wrap: wrap;
}

.presets-label {
    font-size: 0.78rem;
    color: var(--text-tertiary);
}

.preset-chip {
    padding: 4px 12px;
    border: 1px solid var(--border);
    border-radius: 16px;
    background: transparent;
    color: var(--text-secondary);
    font-family: var(--font);
    font-size: 0.75rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 150ms ease;
    position: relative;
}

.preset-chip::before {
    content: '';
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--chip-color);
    display: inline-block;
    margin-right: 4px;
    vertical-align: middle;
}

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

/* Scale Section */
.scale-section {
    margin-bottom: 24px;
}

.scale-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 14px;
    flex-wrap: wrap;
    gap: 8px;
}

.scale-title {
    font-size: 1.1rem;
    font-weight: 700;
}

.scale-actions {
    display: flex;
    gap: 4px;
}

.section-title {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 16px;
}

/* Scale Grid */
.scale-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
    gap: 8px;
}

.swatch {
    border-radius: var(--radius);
    padding: 16px 12px;
    text-align: center;
    cursor: pointer;
    transition: all 150ms ease;
    position: relative;
    border: 2px solid transparent;
}

.swatch:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
    border-color: rgba(255, 255, 255, 0.2);
}

.swatch-step {
    font-size: 0.7rem;
    font-weight: 700;
    opacity: 0.8;
    margin-bottom: 4px;
}

.swatch-hex {
    font-family: 'SF Mono', monospace;
    font-size: 0.72rem;
    font-weight: 500;
}

.swatch-name {
    font-size: 0.65rem;
    margin-top: 2px;
    opacity: 0.7;
}

/* UI Preview */
.preview-section {
    padding: 20px;
    margin-bottom: 24px;
}

.preview-components {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.preview-card {}

.preview-label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.preview-row {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    align-items: center;
}

.preview-btn {
    padding: 8px 16px;
    border: none;
    border-radius: 8px;
    font-family: var(--font);
    font-size: 0.82rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 150ms ease;
}

.preview-btn:hover {
    transform: translateY(-1px);
}

.preview-badge {
    padding: 3px 10px;
    border-radius: 12px;
    font-size: 0.72rem;
    font-weight: 600;
}

.preview-text-block {
    padding: 8px 16px;
    border-radius: 8px;
    font-size: 0.82rem;
    font-weight: 500;
}

/* Contrast Grid */
.contrast-section {
    padding: 20px;
    margin-bottom: 24px;
}

.contrast-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    gap: 8px;
}

.contrast-cell {
    padding: 10px;
    border-radius: 8px;
    text-align: center;
    font-size: 0.72rem;
    font-weight: 600;
    font-family: 'SF Mono', monospace;
}

.contrast-pass {
    border: 1px solid rgba(34, 197, 94, 0.3);
}

.contrast-fail {
    border: 1px solid rgba(239, 68, 68, 0.3);
    opacity: 0.6;
}

/* Toast */
.toast-container {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.toast {
    padding: 10px 18px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    box-shadow: var(--shadow);
    font-size: 0.82rem;
    animation: slideIn 0.2s ease, fadeOut 0.3s ease 2.5s forwards;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(20px);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeOut {
    to {
        opacity: 0;
    }
}

/* Footer */
.footer {
    margin-top: 48px;
    padding: 20px 0;
    border-top: 1px solid var(--border);
}

.footer-inner {
    text-align: center;
    font-size: 0.75rem;
    color: var(--text-tertiary);
}

.footer-inner kbd {
    padding: 2px 6px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 3px;
    font-size: 0.7rem;
}

@media (max-width: 600px) {
    .picker-row {
        flex-direction: column;
    }

    .scale-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .scale-grid {
        grid-template-columns: repeat(5, 1fr);
    }
}