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

/* ── Tokens ─────────────────────────────────────────────────────────────── */

:root {
    --bg:              #1a1a2e;
    --surface:         #16213e;
    --border:          #2a2a4a;
    --text:            #e0e0e0;
    --text-muted:      #888;
    --text-dim:        #555;
    --accent:          #e94560;
    --accent-hover:    #c73652;
    --input-bg:        #0f3460;
    --input-border:    #1a5276;
    --input-text:      #aac8e8;
    --canvas-bg:       #0d0d1a;
    --progress-track:  #2a2a4a;
    --select-bg:       #0f3460;
}

[data-theme="light"] {
    --bg:              #f0f2f5;
    --surface:         #ffffff;
    --border:          #dde1e7;
    --text:            #1a1a2e;
    --text-muted:      #666;
    --text-dim:        #aaa;
    --accent:          #e94560;
    --accent-hover:    #c73652;
    --input-bg:        #e8f0fe;
    --input-border:    #93c5fd;
    --input-text:      #1e3a8a;
    --canvas-bg:       #e0e4ea;
    --progress-track:  #dde1e7;
    --select-bg:       #e8f0fe;
}

/* ── Base ───────────────────────────────────────────────────────────────── */

body {
    background: var(--bg);
    color: var(--text);
    font-family: 'Segoe UI', system-ui, sans-serif;
    min-height: 100vh;
    padding: 2rem 1rem;
    transition: background 0.2s, color 0.2s;
}

.app { max-width: 1100px; margin: 0 auto; }

/* ── Header ─────────────────────────────────────────────────────────────── */

header { margin-bottom: 2rem; }

.header-inner {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 1rem;
}

header h1 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text);
    letter-spacing: -0.5px;
}

header .subtitle {
    margin-top: 0.4rem;
    color: var(--text-muted);
    font-size: 0.95rem;
}

#theme-toggle {
    flex-shrink: 0;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 0.5rem 0.75rem;
    font-size: 1.1rem;
    cursor: pointer;
    line-height: 1;
    transition: background 0.15s, border-color 0.15s;
}
#theme-toggle:hover { border-color: var(--accent); }

/* Show correct icon per theme */
[data-theme="dark"]  #theme-toggle .icon-light { display: none; }
[data-theme="light"] #theme-toggle .icon-dark  { display: none; }

/* ── Card ───────────────────────────────────────────────────────────────── */

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 1.5rem;
    transition: background 0.2s, border-color 0.2s;
}

/* ── Controls ───────────────────────────────────────────────────────────── */

.controls {
    margin-bottom: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
}

.file-label {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    background: var(--input-bg);
    border: 1px dashed var(--input-border);
    border-radius: 7px;
    padding: 0.65rem 1rem;
    cursor: pointer;
    font-size: 0.9rem;
    color: var(--input-text);
    width: 100%;
    transition: filter 0.15s, border-color 0.15s, background 0.15s;
}
.file-label:hover { filter: brightness(1.1); }
.file-label.drag-over {
    border-color: var(--accent);
    background: color-mix(in srgb, var(--input-bg) 80%, var(--accent) 20%);
    filter: brightness(1.1);
}
.file-label input[type="file"] { display: none; }
.file-icon { font-size: 1.1rem; line-height: 1; flex-shrink: 0; }

#file-name {
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* ── Info popovers ───────────────────────────────────────────────────────── */

.info-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 15px;
    height: 15px;
    border-radius: 50%;
    background: var(--text-dim);
    color: var(--surface);
    font-size: 0.6rem;
    font-weight: 700;
    cursor: help;
    position: relative;
    flex-shrink: 0;
    user-select: none;
}

.info-icon::after {
    content: attr(data-tip);
    position: absolute;
    bottom: calc(100% + 8px);
    left: 50%;
    transform: translateX(-50%);
    background: var(--text);
    color: var(--bg);
    padding: 0.45rem 0.65rem;
    border-radius: 6px;
    font-size: 0.75rem;
    line-height: 1.45;
    width: 210px;
    white-space: normal;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.15s;
    z-index: 200;
    text-align: left;
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.35);
}

.info-icon::before {
    content: '';
    position: absolute;
    bottom: calc(100% + 3px);
    left: 50%;
    transform: translateX(-50%);
    border: 5px solid transparent;
    border-top-color: var(--text);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.15s;
    z-index: 201;
}

.info-icon:hover::after,
.info-icon:hover::before { opacity: 1; }

.options-row {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
    align-items: center;
}

.option {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.option label { white-space: nowrap; }

.option input[type="color"] {
    width: 36px;
    height: 32px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    background: none;
    padding: 1px;
}

.option input[type="number"],
.option select {
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: 5px;
    color: var(--text);
    padding: 0.35rem 0.5rem;
    font-size: 0.9rem;
}

.option input[type="number"] { width: 70px; }
.option select { cursor: pointer; }

button#process-frames {
    align-self: flex-start;
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: 7px;
    padding: 0.65rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.15s, transform 0.1s;
}
button#process-frames:hover  { background: var(--accent-hover); }
button#process-frames:active { transform: scale(0.97); }

/* ── Progress ───────────────────────────────────────────────────────────── */

#progress-wrap {
    display: none;
    flex-direction: column;
    gap: 0.4rem;
}
#progress-track {
    height: 6px;
    background: var(--progress-track);
    border-radius: 3px;
    overflow: hidden;
}
#progress-bar {
    height: 100%;
    width: 0%;
    background: var(--accent);
    border-radius: 3px;
    transition: width 0.3s ease;
}
#progress-text { font-size: 0.8rem; color: var(--text-muted); }

/* ── Output ─────────────────────────────────────────────────────────────── */

.output-section { display: flex; flex-direction: column; gap: 1.5rem; }

.barcode-group,
.matches-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

@media (max-width: 700px) {
    .barcode-group,
    .matches-group { grid-template-columns: 1fr; }
}

.barcode-card h2,
.sampler-card h2,
.matches-card h2 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 0.25rem;
}

.desc { font-size: 0.8rem; color: var(--text-dim); margin-bottom: 1rem; }

.canvas-wrap {
    background: var(--canvas-bg);
    border-radius: 6px;
    overflow: hidden;
    min-height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.canvas-wrap canvas { max-width: 100%; height: auto; display: block; }

/* ── Frame grids ────────────────────────────────────────────────────────── */

.frame-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
    gap: 0.6rem;
}

.frame-grid canvas,
.frame-grid div canvas {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 5px;
    border: 1px solid var(--border);
}

.frame-grid div { border-radius: 5px; overflow: hidden; }

.sampler-card .frame-grid {
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
}

/* ── Card header (title + download btn row) ─────────────────────────────── */

.card-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 0.75rem;
    margin-bottom: 1rem;
}
.card-header > div { flex: 1; }
.card-header .desc { margin-bottom: 0; }

.dl-btn {
    flex-shrink: 0;
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    color: var(--input-text);
    border-radius: 6px;
    padding: 0.3rem 0.65rem;
    font-size: 0.78rem;
    cursor: pointer;
    white-space: nowrap;
    transition: filter 0.15s;
}
.dl-btn:hover { filter: brightness(1.15); }

/* ── Modal ──────────────────────────────────────────────────────────────── */

#modal {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.88);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1rem;
}
#modal[hidden] { display: none; }

#modal-canvas {
    max-width: 90vw;
    max-height: 78vh;
    display: block;
    border-radius: 4px;
}

#modal-close {
    position: fixed;
    top: 1rem;
    right: 1rem;
    background: rgba(255, 255, 255, 0.15);
    border: none;
    color: #fff;
    font-size: 1.1rem;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
    transition: background 0.15s;
}
#modal-close:hover { background: rgba(255, 255, 255, 0.3); }

.modal-nav {
    position: fixed;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255, 255, 255, 0.12);
    border: none;
    color: #fff;
    font-size: 2.5rem;
    line-height: 1;
    padding: 0.4rem 0.7rem;
    border-radius: 6px;
    cursor: pointer;
    user-select: none;
    transition: background 0.15s;
}
.modal-nav:hover { background: rgba(255, 255, 255, 0.28); }
#modal-prev { left: 1rem; }
#modal-next { right: 1rem; }

.modal-footer {
    display: flex;
    align-items: center;
    gap: 1rem;
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.85rem;
}

#modal-download {
    background: var(--accent);
    color: #fff;
    border: none;
    padding: 0.45rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.85rem;
    transition: background 0.15s;
}
#modal-download:hover { background: var(--accent-hover); }