/* ============================================
   Screen Resolution Test — Design System
   ============================================ */

:root {
    --bg-primary: #0B0E17;
    --bg-secondary: #12162A;
    --bg-card: rgba(22, 28, 50, 0.85);
    --bg-glass: rgba(22, 28, 50, 0.6);
    --border-glass: rgba(255, 255, 255, 0.08);
    --text-primary: #E8ECF4;
    --text-secondary: #8892B0;
    --text-muted: #5A6480;
    --accent: #6C63FF;
    --accent-glow: rgba(108, 99, 255, 0.3);
    --success: #4ADE80;
    --warning: #FBBF24;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.3);
    --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

[data-theme="light"] {
    --bg-primary: #F0F2F8;
    --bg-secondary: #FFFFFF;
    --bg-card: rgba(255, 255, 255, 0.9);
    --bg-glass: rgba(255, 255, 255, 0.7);
    --border-glass: rgba(0, 0, 0, 0.08);
    --text-primary: #1A1E2E;
    --text-secondary: #4A5568;
    --text-muted: #8892A8;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

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

body::before {
    content: '';
    position: fixed;
    inset: 0;
    background:
        radial-gradient(ellipse 600px 400px at 20% 30%, rgba(108, 99, 255, 0.06) 0%, transparent 70%),
        radial-gradient(ellipse 500px 300px at 80% 70%, rgba(251, 191, 36, 0.04) 0%, transparent 70%);
    pointer-events: none;
    z-index: -1;
}

.app {
    max-width: 860px;
    margin: 0 auto;
    padding: 0 16px 40px;
}

/* Header */
.header {
    padding: 20px 0 16px;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    font-size: 1.8rem;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--accent), #FBBF24);
    border-radius: var(--radius-md);
    box-shadow: 0 4px 16px var(--accent-glow);
}

.logo h1 {
    font-size: 1.25rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--text-primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tagline {
    font-size: 0.72rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.icon-btn {
    width: 40px;
    height: 40px;
    border: none;
    background: var(--bg-glass);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
}

.icon-btn:hover {
    background: var(--bg-card);
    color: var(--accent);
    transform: translateY(-1px);
}

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

.moon-icon {
    display: none;
}

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

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

/* Hero Viewport Display */
.hero-display {
    text-align: center;
    padding: 32px 20px;
    background: var(--bg-card);
    backdrop-filter: blur(16px);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg);
    margin-bottom: 20px;
    box-shadow: var(--shadow-md);
}

.viewport-big {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 8px;
}

.vp-num {
    font-size: 3.5rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    background: linear-gradient(135deg, var(--accent), #A78BFA);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    transition: all 0.15s ease;
}

.vp-x {
    font-size: 1.8rem;
    color: var(--text-muted);
    font-weight: 300;
}

.vp-label {
    font-size: 0.78rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-top: 4px;
}

.orientation-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-top: 12px;
    padding: 6px 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-glass);
    border-radius: 999px;
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--text-secondary);
}

/* Info Cards */
.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 10px;
    margin-bottom: 24px;
}

.card {
    background: var(--bg-card);
    backdrop-filter: blur(16px);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg);
    padding: 16px;
    text-align: center;
    transition: all var(--transition);
}

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

.card-icon {
    font-size: 1.5rem;
    margin-bottom: 6px;
}

.card-label {
    font-size: 0.68rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 4px;
}

.card-value {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-primary);
}

/* Breakpoints */
.breakpoints-section,
.comparison-section,
.details-section {
    margin-bottom: 24px;
}

h2 {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.subtitle {
    font-size: 0.82rem;
    color: var(--text-secondary);
    margin-bottom: 14px;
}

.breakpoints-list {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.bp-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 16px;
    background: var(--bg-card);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-sm);
    transition: all var(--transition);
}

.bp-item.active {
    border-color: var(--accent);
    box-shadow: 0 0 12px var(--accent-glow);
}

.bp-item.active .bp-label {
    color: var(--accent);
}

.bp-label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-primary);
}

.bp-range {
    font-size: 0.78rem;
    color: var(--text-muted);
    font-family: monospace;
}

.bp-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--text-muted);
    transition: background var(--transition);
}

.bp-item.active .bp-dot {
    background: var(--accent);
    box-shadow: 0 0 8px var(--accent-glow);
}

/* Comparison Chart */
.comparison-chart {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

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

.comp-label {
    min-width: 110px;
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-align: right;
}

.comp-bar-wrap {
    flex: 1;
    height: 24px;
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
    overflow: hidden;
    position: relative;
}

.comp-bar {
    height: 100%;
    border-radius: var(--radius-sm);
    transition: width 0.4s ease;
    position: relative;
}

.comp-bar.current {
    background: linear-gradient(90deg, var(--accent), #A78BFA);
}

.comp-bar.other {
    background: rgba(108, 99, 255, 0.2);
}

.comp-size {
    font-size: 0.68rem;
    color: var(--text-muted);
    font-family: monospace;
    min-width: 80px;
}

/* Details Table */
.details-section {
    background: var(--bg-card);
    backdrop-filter: blur(16px);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg);
    padding: 20px;
}

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

.details-table {
    width: 100%;
    border-collapse: collapse;
}

.details-table td {
    padding: 7px 12px;
    border-bottom: 1px solid var(--border-glass);
    font-size: 0.82rem;
    vertical-align: top;
}

.details-table td:first-child {
    font-weight: 600;
    color: var(--text-secondary);
    width: 160px;
}

.details-table td:last-child {
    color: var(--text-primary);
    font-family: monospace;
    font-size: 0.8rem;
}

.details-table tr:last-child td {
    border-bottom: none;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius-sm);
    font-family: var(--font);
    font-size: 0.88rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
}

.btn-secondary {
    background: var(--bg-glass);
    backdrop-filter: blur(8px);
    border: 1px solid var(--border-glass);
    color: var(--text-secondary);
}

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

.btn-sm {
    padding: 6px 14px;
    font-size: 0.8rem;
}

/* Toast */
.toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    padding: 12px 24px;
    background: var(--bg-card);
    backdrop-filter: blur(16px);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.88rem;
    font-weight: 500;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    opacity: 0;
    transition: all 0.35s ease;
    z-index: 100;
    pointer-events: none;
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

.hidden {
    display: none !important;
}

@media (max-width: 640px) {
    .vp-num {
        font-size: 2.5rem;
    }

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

    .comp-label {
        min-width: 70px;
        font-size: 0.68rem;
    }
}