:root {
    color-scheme: dark;
    --bg: #0a0f18;
    --panel: #121a26;
    --panel-soft: #0f1724;
    --ink: #8ee6ff;
    --accent: #ffd166;
    --accent-2: #ff7d9c;
    --text: #eaf2ff;
    --muted: #9bb0d1;
    --grid: rgba(130, 160, 210, 0.2);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: "IBM Plex Mono", "Segoe UI", "Helvetica Neue", Arial, monospace;
    background: radial-gradient(circle at top, #162235, #0a0f18 55%);
    color: var(--text);
}

.shell {
    max-width: 1200px;
    margin: 0 auto;
    padding: 32px 24px 48px;
}

.hero {
    margin-bottom: 24px;
}

.back {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--muted);
    text-decoration: none;
    font-size: 0.95rem;
    margin-bottom: 12px;
}

.back:hover {
    color: var(--text);
}

.badge {
    display: inline-block;
    padding: 6px 12px;
    border: 1px solid rgba(142, 230, 255, 0.4);
    color: var(--ink);
    text-transform: uppercase;
    letter-spacing: 0.12em;
    font-size: 0.7rem;
    margin-bottom: 12px;
}

.hero h1 {
    font-size: 2.4rem;
    margin: 0 0 8px;
}

.subtitle {
    color: var(--muted);
    margin: 0;
}

.workbench {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.panel {
    background: linear-gradient(160deg, rgba(21, 30, 46, 0.94), rgba(10, 16, 28, 0.94));
    border: 1px solid rgba(142, 230, 255, 0.15);
    border-radius: 18px;
    padding: 20px;
    box-shadow: 0 18px 35px rgba(4, 10, 18, 0.6);
}

.panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
    gap: 12px;
}

.panel-header h2 {
    font-size: 1.1rem;
    margin: 0;
}

.meter {
    font-size: 0.85rem;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.12em;
}

.drive {
    position: relative;
    display: grid;
    grid-template-columns: repeat(4, minmax(64px, 1fr));
    gap: 12px;
    padding: 12px;
    border-radius: 16px;
    background: rgba(8, 13, 22, 0.8);
    border: 1px solid rgba(142, 230, 255, 0.2);
}

.drive::after {
    content: "";
    position: absolute;
    inset: 0;
    background: repeating-linear-gradient(
        to bottom,
        rgba(0, 0, 0, 0.14),
        rgba(0, 0, 0, 0.14) 2px,
        rgba(0, 0, 0, 0) 2px,
        rgba(0, 0, 0, 0) 4px
    );
    pointer-events: none;
    border-radius: 16px;
}

.cell {
    position: relative;
    aspect-ratio: 1 / 1;
    border-radius: 14px;
    border: 1px solid rgba(255, 255, 255, 0.12);
    background: rgba(18, 26, 38, 0.8);
    color: var(--text);
    font-size: 1.6rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    transition: transform 0.1s ease, border 0.2s ease, background 0.2s ease;
    z-index: 1;
}

.cell:hover {
    border-color: rgba(255, 209, 102, 0.7);
    transform: translateY(-2px);
}

.cell.empty {
    background: rgba(8, 12, 20, 0.6);
    border-style: dashed;
    color: rgba(255, 255, 255, 0.2);
    cursor: default;
}

.cell.empty:hover {
    border-color: rgba(255, 255, 255, 0.12);
    transform: none;
}

.cell .label {
    font-size: 1.6rem;
    letter-spacing: 0.06em;
}

.cell .frag {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.18em;
    color: rgba(255, 255, 255, 0.8);
}

.cell.file-a {
    background: rgba(123, 255, 234, 0.2);
    border-color: rgba(123, 255, 234, 0.5);
    color: #7bffea;
    box-shadow: 0 0 18px rgba(123, 255, 234, 0.25);
}

.cell.file-b {
    background: rgba(255, 209, 102, 0.2);
    border-color: rgba(255, 209, 102, 0.5);
    color: #ffd166;
    box-shadow: 0 0 18px rgba(255, 209, 102, 0.2);
}

.cell.file-c {
    background: rgba(255, 125, 156, 0.2);
    border-color: rgba(255, 125, 156, 0.5);
    color: #ff7d9c;
    box-shadow: 0 0 18px rgba(255, 125, 156, 0.2);
}

.legend {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 12px;
    margin-top: 16px;
    font-size: 0.85rem;
    color: var(--muted);
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 8px;
}

.swatch {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    display: inline-block;
    box-shadow: 0 0 8px rgba(0, 0, 0, 0.4);
}

.swatch.file-a {
    background: #7bffea;
}

.swatch.file-b {
    background: #ffd166;
}

.swatch.file-c {
    background: #ff7d9c;
}

.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 14px;
    margin-bottom: 18px;
}

.stat {
    background: var(--panel-soft);
    padding: 12px 14px;
    border-radius: 12px;
    border: 1px solid rgba(142, 230, 255, 0.12);
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.stat .label {
    font-size: 0.75rem;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.12em;
}

.progress {
    margin-bottom: 18px;
}

.progress-bar {
    height: 12px;
    background: rgba(10, 16, 28, 0.8);
    border-radius: 999px;
    border: 1px solid rgba(142, 230, 255, 0.2);
    overflow: hidden;
    margin-bottom: 8px;
}

#progress-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, rgba(123, 255, 234, 0.8), rgba(255, 209, 102, 0.9));
    transition: width 0.2s ease;
}

.progress-meta {
    font-size: 0.8rem;
    color: var(--muted);
}

.controls {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 16px;
}

.btn,
.chip {
    border: 1px solid rgba(142, 230, 255, 0.3);
    background: rgba(16, 26, 40, 0.8);
    color: var(--text);
    padding: 8px 14px;
    border-radius: 999px;
    font-size: 0.85rem;
    cursor: pointer;
    transition: transform 0.1s ease, border 0.2s ease, background 0.2s ease;
}

.btn:hover,
.chip:hover {
    border-color: rgba(255, 209, 102, 0.7);
    transform: translateY(-1px);
}

.btn.ghost,
.chip.ghost {
    background: rgba(12, 18, 30, 0.4);
    border-color: rgba(155, 176, 209, 0.35);
    color: var(--muted);
}

.status {
    font-size: 0.85rem;
    color: var(--accent);
    margin-bottom: 14px;
}

.tips {
    font-size: 0.85rem;
    color: var(--muted);
    line-height: 1.5;
}

.tips ul {
    padding-left: 18px;
    margin: 6px 0 0;
}

.footer {
    margin-top: 26px;
    color: var(--muted);
    font-size: 0.85rem;
}

@media (max-width: 900px) {
    .shell {
        padding: 24px 16px 40px;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .drive {
        gap: 10px;
    }
}