/* Perceive CVD Demo — custom theme over Pico CSS */

/* Import fonts: Inter for body, Space Grotesk for headings */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&family=Space+Grotesk:wght@500;700&display=swap');

:root {
    --pico-font-family: 'Inter', system-ui, sans-serif;
    --pico-font-size: 16px;
    --pico-border-radius: 0.5rem;

    /* Light theme accents */
    --accent: #2563eb;
    --accent-hover: #1d4ed8;
    --surface-raised: #ffffff;
    --surface-bg: #f8fafc;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --border-subtle: #e2e8f0;
    --drop-zone-bg: #f1f5f9;
    --drop-zone-border: #94a3b8;
    --drop-zone-active-border: var(--accent);
    --drop-zone-active-bg: #eff6ff;
}

[data-theme="dark"] {
    --accent: #60a5fa;
    --accent-hover: #93bbfd;
    --surface-raised: #1e293b;
    --surface-bg: #0f172a;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --border-subtle: #334155;
    --drop-zone-bg: #1e293b;
    --drop-zone-border: #475569;
    --drop-zone-active-border: var(--accent);
    --drop-zone-active-bg: #1e3a5f;
}

* { box-sizing: border-box; }

body {
    background: var(--surface-bg);
    color: var(--text-primary);
    margin: 0;
    min-height: 100vh;
}

h1, h2, h3 {
    font-family: 'Space Grotesk', system-ui, sans-serif;
    letter-spacing: -0.02em;
}

/* Top bar */
header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 2rem;
    border-bottom: 1px solid var(--border-subtle);
    background: var(--surface-raised);
}

header h1 {
    font-size: 1.25rem;
    margin: 0;
    font-weight: 700;
}

header .subtitle {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-left: 0.75rem;
    font-weight: 400;
}

#theme-toggle {
    background: none;
    border: 1px solid var(--border-subtle);
    border-radius: var(--pico-border-radius);
    padding: 0.4rem 0.75rem;
    cursor: pointer;
    font-size: 0.85rem;
    color: var(--text-primary);
}

/* Main content */
main {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1.5rem 2rem;
}

/* Controls row */
.controls {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.controls label {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin: 0;
}

.controls input[type="range"] {
    width: 180px;
}

.severity-value {
    font-variant-numeric: tabular-nums;
    min-width: 3ch;
}

/* Drop zone */
.drop-zone {
    border: 2px dashed var(--drop-zone-border);
    border-radius: var(--pico-border-radius);
    background: var(--drop-zone-bg);
    padding: 3rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.15s, background 0.15s;
    margin-bottom: 1.5rem;
}

.drop-zone:hover,
.drop-zone.active {
    border-color: var(--drop-zone-active-border);
    background: var(--drop-zone-active-bg);
}

.drop-zone p {
    margin: 0;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.drop-zone .hint {
    font-size: 0.8rem;
    margin-top: 0.5rem;
    opacity: 0.7;
}

/* Image grid */
.image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1rem;
}

.image-card {
    background: var(--surface-raised);
    border: 1px solid var(--border-subtle);
    border-radius: var(--pico-border-radius);
    overflow: hidden;
}

.image-card .card-label {
    padding: 0.6rem 0.85rem;
    font-family: 'Space Grotesk', system-ui, sans-serif;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-subtle);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.image-card .card-label .timing {
    font-family: 'Inter', system-ui, sans-serif;
    font-size: 0.75rem;
    opacity: 0.6;
    font-variant-numeric: tabular-nums;
}

.image-card canvas {
    display: block;
    width: 100%;
    height: auto;
}

/* Loading state */
.loading {
    display: none;
    text-align: center;
    padding: 1rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.loading.visible {
    display: block;
}

/* Hidden file input */
#file-input { display: none; }