:root {
    --bg: #faf8f4;
    --surface: #ffffff;
    --ink: #1a1814;
    --ink-soft: #5a5650;
    --ink-faint: #9a958d;
    --line: #e8e3da;
    --line-strong: #d4ccbe;
    --accent: #b8533a;
    --accent-soft: #f3e6df;
}

* { box-sizing: border-box; }

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

html, body {
    margin: 0;
    padding: 0;
    background: var(--bg);
    color: var(--ink);
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    font-size: 15px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    min-height: 100vh;
}

body {
    background-image:
        radial-gradient(circle at 20% 10%, rgba(184, 83, 58, 0.04), transparent 40%),
        radial-gradient(circle at 80% 90%, rgba(184, 83, 58, 0.03), transparent 40%);
}

.back-link {
    position: fixed;
    top: 16px;
    left: 20px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 999px;
    color: var(--ink-soft);
    font-size: 12px;
    font-weight: 500;
    text-decoration: none;
    letter-spacing: 0.02em;
    transition: color 0.15s ease, border-color 0.15s ease, background 0.15s ease;
    z-index: 50;
}

.back-link:hover {
    color: var(--accent);
    border-color: var(--accent);
    background: var(--accent-soft);
}

.app {
    max-width: 1180px;
    margin: 0 auto;
    padding: 48px 40px;
    display: grid;
    grid-template-columns: 1fr 360px;
    gap: 48px;
    align-items: center;
    min-height: 100vh;
}

/* Stage */
.stage {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.stage-frame {
    position: relative;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 4px;
    padding: 20px;
    box-shadow:
        0 1px 2px rgba(26, 24, 20, 0.04),
        0 10px 40px -10px rgba(26, 24, 20, 0.08);
}

canvas {
    max-width: 100%;
    max-height: calc(100vh - 220px);
    width: auto;
    height: auto;
    margin: 0 auto;
    display: block;
    background: #0a0907;
    border-radius: 2px;
}

.canvas-hint {
    position: absolute;
    inset: 20px;
    border-radius: 2px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: rgba(255, 255, 255, 0.45);
    font-size: 14px;
    letter-spacing: 0.02em;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.canvas-hint.hidden { opacity: 0; }

.stage-meta {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 0 4px;
}

.timer-block {
    min-width: 110px;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.timer {
    font-family: 'JetBrains Mono', monospace;
    font-size: 28px;
    font-weight: 500;
    letter-spacing: -0.02em;
    color: var(--ink);
    font-variant-numeric: tabular-nums;
    line-height: 1;
}

.timer-sub {
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    color: var(--ink-faint);
    font-variant-numeric: tabular-nums;
    letter-spacing: 0.02em;
}

.progress-track {
    flex: 1;
    height: 6px;
    background: var(--line);
    overflow: hidden;
    border-radius: 3px;
}

.icon-btn {
    width: 34px;
    height: 34px;
    border-radius: 50%;
    border: 1px solid var(--line);
    background: var(--surface);
    color: var(--ink-soft);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    transition: all 0.15s ease;
}

.icon-btn:hover {
    color: var(--accent);
    border-color: var(--accent);
}

.icon-btn .icon-play { display: none; }
.icon-btn.paused .icon-pause { display: none; }
.icon-btn.paused .icon-play { display: block; }

.progress-fill {
    height: 100%;
    width: 0%;
    background: var(--accent);
    transition: width 0.1s linear;
}

/* Controls */
.controls {
    display: flex;
    flex-direction: column;
    gap: 36px;
}

.brand h1 {
    margin: 0 0 6px;
    font-family: 'Instrument Serif', serif;
    font-size: 44px;
    font-weight: 400;
    letter-spacing: -0.02em;
    line-height: 1;
    color: var(--ink);
}

.brand h1 em {
    font-style: italic;
    color: var(--accent);
}

.brand p {
    margin: 0;
    color: var(--ink-soft);
    font-size: 14px;
    line-height: 1.5;
    max-width: 28ch;
}

.grain-counter {
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    color: var(--ink-faint);
    letter-spacing: 0.02em;
    font-variant-numeric: tabular-nums;
}

.grain-counter #grainCount {
    color: var(--ink-soft);
}

.group {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.group-label {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--ink-faint);
}

/* Gallery */
.gallery {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
    overflow-y: auto;
    overflow-x: hidden;
    scrollbar-width: thin;
    scrollbar-color: var(--line-strong) transparent;
    padding-right: 2px;
}

.gallery::-webkit-scrollbar { width: 6px; }
.gallery::-webkit-scrollbar-track { background: transparent; }
.gallery::-webkit-scrollbar-thumb {
    background: var(--line-strong);
    border-radius: 3px;
}

.gallery:empty { display: none; }

.preset {
    aspect-ratio: 1;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 3px;
    cursor: pointer;
    overflow: hidden;
    padding: 0;
    position: relative;
    transition: border-color 0.15s ease, transform 0.15s ease;
}

.preset:hover {
    border-color: var(--line-strong);
}

.preset.active {
    border-color: var(--accent);
    box-shadow: 0 0 0 2px var(--accent);
}

.preset img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.preset .remove {
    position: absolute;
    top: 3px;
    right: 3px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: rgba(26, 24, 20, 0.75);
    color: #fff;
    border: none;
    padding: 0;
    cursor: pointer;
    font-size: 11px;
    line-height: 1;
    display: none;
    align-items: center;
    justify-content: center;
}

.preset:hover .remove {
    display: flex;
}

.preset .remove:hover {
    background: var(--accent);
}

/* Upload */
input[type="file"] { display: none; }

.upload {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 12px;
    background: transparent;
    border: 1px dashed var(--line-strong);
    border-radius: 3px;
    cursor: pointer;
    color: var(--ink-soft);
    font-size: 13px;
    transition: border-color 0.15s, color 0.15s, background 0.15s;
}

.upload:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--accent-soft);
}

.upload svg {
    flex-shrink: 0;
}

#fileName {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Duration */
.duration {
    display: flex;
    align-items: baseline;
    gap: 14px;
    border-bottom: 1px solid var(--line);
    padding-bottom: 10px;
}

.duration-field {
    display: flex;
    align-items: baseline;
    gap: 6px;
    flex: 1;
}

.duration-sep {
    font-family: 'JetBrains Mono', monospace;
    font-size: 20px;
    color: var(--ink-faint);
    font-weight: 500;
}

input[type="number"] {
    flex: 1;
    border: none;
    background: transparent;
    color: var(--ink);
    font-family: 'JetBrains Mono', monospace;
    font-size: 22px;
    font-weight: 500;
    letter-spacing: -0.02em;
    padding: 0;
    width: 100%;
    -moz-appearance: textfield;
}

input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

input[type="number"]:focus { outline: none; }

.unit {
    color: var(--ink-faint);
    font-size: 13px;
}

.chips {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 6px;
}

.chip {
    background: transparent;
    border: 1px solid var(--line);
    color: var(--ink-soft);
    padding: 7px 0;
    border-radius: 3px;
    cursor: pointer;
    font-size: 12px;
    font-weight: 500;
    font-family: inherit;
    transition: all 0.15s ease;
}

.chip:hover {
    border-color: var(--line-strong);
    color: var(--ink);
}

.chip.active {
    background: var(--ink);
    color: var(--bg);
    border-color: var(--ink);
}

/* Actions */
.actions {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 8px;
    margin-top: 4px;
}

.actions.single {
    grid-template-columns: 1fr;
}

.btn[hidden] { display: none; }

.btn {
    padding: 12px 16px;
    border: 1px solid transparent;
    border-radius: 3px;
    cursor: pointer;
    font-weight: 500;
    font-size: 13px;
    font-family: inherit;
    letter-spacing: 0.01em;
    transition: all 0.15s ease;
}

.btn-primary {
    background: var(--ink);
    color: var(--bg);
}

.btn-primary:hover:not(:disabled) {
    background: var(--accent);
}

.btn-primary:disabled {
    background: transparent;
    color: var(--ink-faint);
    border-color: var(--line-strong);
    cursor: not-allowed;
}

.btn-primary:disabled:hover {
    background: transparent;
}

.btn-ghost {
    background: transparent;
    color: var(--ink-soft);
    border-color: var(--line);
}

.btn-ghost:hover {
    color: var(--ink);
    border-color: var(--line-strong);
}

/* Resume modal */
.resume-modal[hidden] { display: none; }

.resume-modal {
    position: fixed;
    inset: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.resume-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(26, 24, 20, 0.55);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}

.resume-card {
    position: relative;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 6px;
    padding: 24px;
    width: 100%;
    max-width: 360px;
    box-shadow: 0 20px 60px -10px rgba(26, 24, 20, 0.4);
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.resume-card h2 {
    margin: 0;
    font-family: 'Instrument Serif', serif;
    font-size: 26px;
    font-weight: 400;
    letter-spacing: -0.01em;
    color: var(--ink);
}

.resume-sub {
    margin: -10px 0 0;
    font-size: 13px;
    color: var(--ink-soft);
}

.resume-preview {
    width: 100%;
    aspect-ratio: 1;
    max-height: 180px;
    background: #0a0907;
    border-radius: 3px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.resume-preview img {
    max-width: 100%;
    max-height: 100%;
    width: auto;
    height: auto;
    display: block;
}

.resume-meta {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.resume-time {
    font-family: 'JetBrains Mono', monospace;
    font-size: 13px;
    color: var(--ink-soft);
    font-variant-numeric: tabular-nums;
}

.resume-progress {
    height: 4px;
    background: var(--line);
    border-radius: 2px;
    overflow: hidden;
}

.resume-progress-fill {
    height: 100%;
    width: 0%;
    background: var(--accent);
}

.resume-actions {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 8px;
    margin-top: 4px;
}

@media (max-width: 900px) {
    .app {
        grid-template-columns: 1fr;
        padding: 72px 24px 32px;
        gap: 36px;
    }
    .controls { order: -1; }
    .brand h1 { font-size: 36px; }
}