:root {
    color-scheme: light dark;
    --bg: #0f1419;
    --panel: #1a2332;
    --panel-border: #2d3a4d;
    --text: #e8eef7;
    --muted: #94a3b8;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --danger-bg: #3f1d24;
    --danger-text: #fecaca;
    --success-bg: #14352a;
    --success-text: #bbf7d0;
    font-family: "Segoe UI", system-ui, sans-serif;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    background:
        radial-gradient(circle at top, rgba(59, 130, 246, 0.18), transparent 40%),
        var(--bg);
    color: var(--text);
}

.page {
    max-width: 720px;
    margin: 0 auto;
    padding: 3rem 1.25rem 2rem;
}

.header h1 {
    margin: 0 0 0.5rem;
    font-size: 2rem;
    font-weight: 700;
}

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

.build-meta {
    margin: 0.75rem 0 0;
    font-size: 0.85rem;
    color: var(--muted);
}

.messages {
    margin: 1.5rem 0;
}

.message {
    padding: 0.85rem 1rem;
    border-radius: 0.75rem;
    margin-bottom: 0.75rem;
}

.message-danger {
    background: var(--danger-bg);
    color: var(--danger-text);
}

.drop-zone {
    margin-top: 2rem;
    padding: 3rem 1.5rem;
    border: 2px dashed var(--panel-border);
    border-radius: 1rem;
    background: var(--panel);
    text-align: center;
    cursor: pointer;
    transition: border-color 0.15s ease, background 0.15s ease, transform 0.15s ease;
}

.drop-zone:hover,
.drop-zone:focus-visible,
.drop-zone.drag-over {
    border-color: var(--accent);
    background: #1f2a3d;
    outline: none;
}

.drop-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 3.5rem;
    height: 3.5rem;
    margin-bottom: 1rem;
    border-radius: 999px;
    background: rgba(59, 130, 246, 0.15);
    color: var(--accent);
    font-weight: 700;
    letter-spacing: 0.04em;
}

.drop-title {
    margin: 0 0 0.35rem;
    font-size: 1.15rem;
    font-weight: 600;
}

.drop-hint,
.selected-file {
    margin: 0;
    color: var(--muted);
}

.selected-file {
    margin-top: 1rem;
    color: var(--text);
    word-break: break-all;
}

.drop-zone.busy {
    opacity: 0.7;
    cursor: wait;
    pointer-events: none;
}

.status {
    margin: 1.25rem 0 0;
    padding: 0.85rem 1rem;
    border-radius: 0.75rem;
}

.status-info {
    background: rgba(59, 130, 246, 0.15);
    color: var(--text);
}

.status-success {
    background: var(--success-bg);
    color: var(--success-text);
}

.status-danger {
    background: var(--danger-bg);
    color: var(--danger-text);
}

.footer {
    margin-top: 2rem;
    text-align: center;
}

.footer a {
    color: var(--muted);
    text-decoration: none;
}

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

@media (prefers-color-scheme: light) {
    :root {
        --bg: #f4f7fb;
        --panel: #ffffff;
        --panel-border: #cbd5e1;
        --text: #0f172a;
        --muted: #64748b;
        --danger-bg: #fee2e2;
        --danger-text: #991b1b;
    }

    body {
        background:
            radial-gradient(circle at top, rgba(59, 130, 246, 0.12), transparent 45%),
            var(--bg);
    }

    .drop-zone:hover,
    .drop-zone:focus-visible,
    .drop-zone.drag-over {
        background: #f8fbff;
    }
}