:root {
    --bg-primary: #0d0a12;
    --bg-secondary: #140f1e;
    --bg-tertiary: #1e1630;
    --bg-card: #1a1228;
    --accent: #b86fff;
    --accent-dim: #7c3aaa;
    --accent-glow: rgba(184, 111, 255, 0.12);
    --success: #a3e635;
    --warning: #f59e0b;
    --error: #f43f5e;
    --info: #c9a0e8;
    --text-primary: #f0eaf8;
    --text-secondary: #c9b8e0;
    --text-muted: #8a7aa0;
    --border-color: #2e2045;
}

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

html { overflow-x: hidden; }
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.5;
    font-size: 15px;
    overflow-x: hidden;
}

/* ── Tool page topbar ─────────────────────────────────────────────────────── */
.app-topbar {
    background: #c9a0e8;
    padding: 0.75rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
    width: 100%;
    box-sizing: border-box;
}

.brand-link { text-decoration: none; }

.app-brand h1 {
    font-size: 1.15rem;
    font-weight: 700;
    color: #1a0a2e;
    letter-spacing: -0.01em;
}

.app-brand .subtitle { font-size: 0.7rem; color: #6a3a8a; margin-top: 0.1rem; }

.tool-nav { display: flex; align-items: center; gap: 0.25rem; }

.tool-nav-link {
    text-decoration: none;
    font-size: 0.82rem;
    font-weight: 500;
    color: #5a3a7a;
    padding: 0.4rem 0.8rem;
    border-radius: 4px;
    transition: all 0.15s;
    white-space: nowrap;
}

.tool-nav-link:hover { background: rgba(90,26,154,0.15); color: #1a0a2e; }
.tool-nav-link.active { background: rgba(90,26,154,0.2); color: #1a0a2e; font-weight: 600; }
.tool-nav-home { margin-left: 0.5rem; border-left: 1px solid rgba(90,26,154,0.3); padding-left: 1rem; }

.container { max-width: 1800px; margin: 0 auto; padding: 1.25rem 1.5rem 2rem; }

/* ── Cards ───────────────────────────────────────────────────────────────── */
.card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    overflow: hidden;
}

.card-header {
    padding: 0.65rem 1rem;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.card-title {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.6px;
}

.card-body { padding: 1rem; }

/* ── Buttons ─────────────────────────────────────────────────────────────── */
button {
    padding: 0.55rem 1rem;
    border: none;
    border-radius: 4px;
    font-family: inherit;
    font-size: 0.82rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.15s;
}

.btn-primary { background: var(--accent); color: #0d0a12; flex: 1; }
.btn-primary:hover { background: #ca92ff; }

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    flex: 1;
}
.btn-secondary:hover { background: var(--border-color); color: var(--text-primary); }
.btn-small { padding: 0.3rem 0.6rem; font-size: 0.72rem; flex: none; }
.btn-copy { background: var(--bg-tertiary); color: var(--text-muted); border: 1px solid var(--border-color); }
.btn-copy:hover { color: var(--accent); border-color: var(--accent); }
.btn-copy.copied { color: var(--success); border-color: var(--success); }
.btn-row { display: flex; gap: 0.5rem; margin-top: 0.75rem; }

/* ── Forms ───────────────────────────────────────────────────────────────── */
select, input[type="number"], input[type="text"] {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.5rem 0.75rem;
    border-radius: 4px;
    font-family: inherit;
    font-size: 0.85rem;
    cursor: pointer;
}

select { min-width: 200px; }
select:focus, input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 2px var(--accent-glow); }

textarea {
    width: 100%;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 0.75rem;
    color: var(--text-primary);
    font-family: 'SF Mono', 'Cascadia Code', Consolas, Monaco, monospace;
    font-size: 0.82rem;
    line-height: 1.5;
    resize: vertical;
}

textarea:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 2px var(--accent-glow); }

/* ── Scrollbar ───────────────────────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg-tertiary); }
::-webkit-scrollbar-thumb { background: var(--accent-dim); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent); }

/* ── Shared badges ───────────────────────────────────────────────────────── */
.detected-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.3rem 0.65rem;
    background: var(--accent-glow);
    border: 1px solid var(--accent-dim);
    border-radius: 3px;
    font-size: 0.75rem;
    color: var(--accent);
}

.detected-badge.low-confidence {
    background: rgba(245,158,11,0.1);
    border-color: rgba(245,158,11,0.4);
    color: var(--warning);
}

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 3rem;
    color: var(--text-muted);
    text-align: center;
    font-size: 0.9rem;
}

.no-issues {
    padding: 0.75rem 1rem;
    background: rgba(163,230,53,0.1);
    border: 1px solid rgba(163,230,53,0.3);
    border-radius: 4px;
    color: var(--success);
    font-size: 0.82rem;
}

.page { display: none; }
.page.active { display: block; }

/* ── Mobile topbar ────────────────────────────────────────────────────────── */
@media (max-width: 600px) {
    .app-topbar {
        padding: 0.6rem 1rem;
        gap: 0.5rem;
    }

    .app-brand h1 { font-size: 1rem; }
    .app-brand .subtitle { display: none; }

    .tool-nav { gap: 0; }
    .tool-nav-link { font-size: 0.72rem; padding: 0.35rem 0.5rem; }
    .tool-nav-home { margin-left: 0.25rem; padding-left: 0.6rem; }
}