:root {
    --bg: #f4f5f7;
    --surface: #ffffff;
    --border: #e3e5ea;
    --text: #1c1f24;
    --muted: #6b7280;
    --accent: #4f46e5;
    --accent-soft: #eef0fe;
    --danger: #b42318;
    --warn-bg: #fff8eb;
    --warn-border: #e0a92e;
    --warn-text: #7a5008;
    --radius: 12px;
    --shadow: 0 1px 2px rgba(16, 24, 40, 0.04), 0 1px 3px rgba(16, 24, 40, 0.08);
}

html.theme-dark {
    --bg: #0f1117;
    --surface: #1a1d25;
    --border: #2b303b;
    --text: #e6e8ec;
    --muted: #9aa1ad;
    --accent: #818cf8;
    --accent-soft: #262b45;
    --danger: #f97066;
    --warn-bg: #2a2410;
    --warn-border: #b9881f;
    --warn-text: #e8c97a;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 1px 3px rgba(0, 0, 0, 0.4);
    color-scheme: dark;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    line-height: 1.55;
}

main {
    max-width: 820px;
    margin: 0 auto;
    padding: 32px 20px 64px;
}

/* Header / nav */
.site-header {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 10;
}

.site-nav {
    max-width: 820px;
    margin: 0 auto;
    padding: 12px 20px;
    display: flex;
    align-items: center;
    gap: 20px;
}

.brand {
    font-weight: 700;
    font-size: 1.05rem;
    color: var(--text);
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 6px;
    margin-right: auto;
}

.nav-links a {
    padding: 6px 12px;
    border-radius: 8px;
    color: var(--muted);
    text-decoration: none;
    font-size: 0.94rem;
    transition: background 0.15s, color 0.15s;
}

.nav-links a:hover {
    background: var(--accent-soft);
    color: var(--accent);
}

.dev-toggle {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem;
    color: var(--muted);
    cursor: pointer;
    user-select: none;
}

.theme-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    padding: 0;
    font-size: 1rem;
    line-height: 1;
    color: var(--text);
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    cursor: pointer;
}

.theme-toggle:hover {
    border-color: var(--accent);
    filter: none;
}

h1 {
    font-size: 1.6rem;
    margin: 0 0 20px;
}

h2 {
    font-size: 1.15rem;
    margin: 0 0 8px;
}

/* Cards */
.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 20px;
}

/* Search form */
form {
    margin: 0;
}

label {
    font-weight: 600;
    font-size: 0.92rem;
}

textarea {
    display: block;
    width: 100%;
    margin: 8px 0 16px;
    padding: 12px 14px;
    font: inherit;
    color: var(--text);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    resize: vertical;
    transition: border-color 0.15s, box-shadow 0.15s;
}

textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-soft);
}

.form-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    flex-wrap: wrap;
}

button {
    padding: 10px 20px;
    font: inherit;
    font-weight: 600;
    color: #fff;
    background: var(--accent);
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: filter 0.15s;
}

button:hover {
    filter: brightness(1.08);
}

.check {
    display: inline-flex;
    gap: 8px;
    align-items: center;
    font-weight: 500;
    color: var(--muted);
}

.actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 24px;
}

/* Answer + results */
#results {
    display: block;
    margin-top: 28px;
}

.rank-label {
    font-size: 0.82rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--muted);
    margin-bottom: 16px;
}

.answer {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 20px;
    margin-bottom: 24px;
}

.answer p:last-child {
    margin-bottom: 0;
}

.results {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    gap: 16px;
}

.results > li {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 18px 20px;
}

.results h2 {
    font-size: 1.05rem;
}

.results h2 a {
    color: var(--text);
    text-decoration: none;
}

.results h2 a:hover {
    color: var(--accent);
}

.meta {
    color: var(--muted);
    font-size: 0.88rem;
    margin: 0 0 10px;
}

.scores {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 14px 0 0;
}

.scores div {
    display: inline-flex;
    gap: 6px;
    align-items: baseline;
    padding: 3px 10px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 999px;
    font-size: 0.78rem;
}

.scores dt {
    font-weight: 600;
    color: var(--muted);
}

.scores dd {
    margin: 0;
    font-variant-numeric: tabular-nums;
}

/* Runtime — developer diagnostics, hidden unless dev mode is on */
.runtime {
    display: none;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 18px 20px;
    margin-bottom: 24px;
}

html.dev .runtime {
    display: block;
}

.timing-chart {
    display: grid;
    gap: 8px;
    padding: 0;
    margin: 12px 0 0;
    list-style: none;
}

.timing-chart li {
    display: grid;
    grid-template-columns: minmax(150px, 1fr) minmax(160px, 2fr) auto auto;
    gap: 10px;
    align-items: center;
    font-size: 0.85rem;
}

.timing-bar {
    height: 8px;
    overflow: hidden;
    background: var(--bg);
    border-radius: 999px;
}

.timing-bar span {
    display: block;
    height: 100%;
    background: var(--accent);
    border-radius: 999px;
}

.timing-value,
.timing-remaining {
    color: var(--muted);
    font-variant-numeric: tabular-nums;
    text-align: right;
}

/* Tables */
table {
    width: 100%;
    border-collapse: collapse;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
}

th,
td {
    padding: 10px 14px;
    border-bottom: 1px solid var(--border);
    text-align: left;
    font-size: 0.9rem;
}

th {
    font-weight: 600;
    color: var(--muted);
    background: var(--bg);
}

tbody tr:last-child td {
    border-bottom: none;
}

dl dt {
    font-weight: 600;
    color: var(--muted);
    font-size: 0.85rem;
}

dl dd {
    margin: 0 0 12px;
}

/* States */
.error {
    color: var(--danger);
    font-weight: 600;
}

.notice {
    margin: 12px 0;
    padding: 10px 14px;
    border-left: 3px solid var(--warn-border);
    border-radius: 6px;
    background: var(--warn-bg);
    color: var(--warn-text);
    font-weight: 500;
}

.status {
    color: var(--muted);
}