/* ── Base ── */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --bg: #fafaf8;
    --surface: #ffffff;
    --border: #d4d0c8;
    --text: #2c2c2c;
    --text-muted: #6b6b6b;
    --accent: #1a5276;
    --accent-light: #2980b9;
    --canon-bg: #eef6ee;
    --canon-border: #4a8c5c;
    --vanilla-bg: #f5f0e8;
    --vanilla-border: #b8860b;
    --win-bg: #d4edda;
    --lose-bg: #f8f0e0;
    --radius: 6px;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

html {
    font-size: 16px;
}

body {
    font-family: "Georgia", "Times New Roman", serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.65;
    max-width: 960px;
    margin: 0 auto;
    padding: 1.5rem 1rem;
}

a {
    color: var(--accent-light);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* ── Header ── */
header {
    text-align: center;
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 2px solid var(--border);
}

header h1 {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--accent);
    margin-bottom: 0.3rem;
}

.subtitle {
    font-style: italic;
    color: var(--text-muted);
    font-size: 0.95rem;
}

.meta {
    margin-top: 0.5rem;
    font-size: 0.85rem;
}

/* ── Tabs ── */
.mode-tabs {
    display: flex;
    gap: 0;
    margin-bottom: 1.5rem;
    border-bottom: 2px solid var(--border);
}

.tab {
    flex: 1;
    padding: 0.7rem 1rem;
    background: transparent;
    border: none;
    border-bottom: 3px solid transparent;
    font-family: inherit;
    font-size: 0.95rem;
    cursor: pointer;
    color: var(--text-muted);
    transition: all 0.2s;
}

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

.tab.active {
    color: var(--accent);
    border-bottom-color: var(--accent);
    font-weight: 600;
}

/* ── Mode panels ── */
.mode-panel {
    display: none;
}

.mode-panel.active {
    display: block;
}

/* ── Book selector ── */
.book-selector {
    margin-bottom: 1.2rem;
}

.book-selector label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 0.3rem;
    color: var(--text-muted);
    font-family: system-ui, sans-serif;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.book-selector select {
    width: 100%;
    padding: 0.6rem 0.8rem;
    font-family: inherit;
    font-size: 0.95rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--surface);
    color: var(--text);
}

/* ── Book info card ── */
.book-info {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem 1.2rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow);
}

.book-info h2 {
    font-size: 1.15rem;
    margin-bottom: 0.2rem;
}

.book-info .author {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.book-info .description {
    font-size: 0.9rem;
    margin-bottom: 0.6rem;
}

.book-info .stats {
    font-family: system-ui, sans-serif;
    font-size: 0.8rem;
    color: var(--text-muted);
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.book-info .stats strong {
    color: var(--text);
}

/* ── Examples list ── */
.examples-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* ── Single example / comparison ── */
.comparison {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.comparison-header {
    padding: 0.8rem 1.2rem;
    border-bottom: 1px solid var(--border);
    background: #f7f6f3;
}

.comparison-header .question {
    font-weight: 600;
    font-size: 0.95rem;
}

.comparison-header .category {
    display: inline-block;
    margin-top: 0.3rem;
    font-family: system-ui, sans-serif;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-muted);
    background: var(--bg);
    padding: 0.15rem 0.5rem;
    border-radius: 3px;
}

.responses {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
}

@media (max-width: 700px) {
    .responses {
        grid-template-columns: 1fr;
    }
}

.response-col {
    padding: 1rem 1.2rem;
    font-size: 0.88rem;
    line-height: 1.6;
    border-right: 1px solid var(--border);
    position: relative;
}

.response-col:last-child {
    border-right: none;
}

.response-col.vanilla {
    background: var(--vanilla-bg);
}

.response-col.canon {
    background: var(--canon-bg);
}

.response-label {
    font-family: system-ui, sans-serif;
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.07em;
    margin-bottom: 0.6rem;
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.response-col.vanilla .response-label {
    color: var(--vanilla-border);
}

.response-col.canon .response-label {
    color: var(--canon-border);
}

.winner-badge {
    font-size: 0.65rem;
    background: var(--canon-border);
    color: #fff;
    padding: 0.1rem 0.4rem;
    border-radius: 3px;
    font-weight: 600;
}

.response-text {
    white-space: pre-wrap;
    word-break: break-word;
}

.response-text p {
    margin-bottom: 0.6rem;
}

/* ── Scores bar ── */
.scores-bar {
    padding: 0.6rem 1.2rem;
    border-top: 1px solid var(--border);
    background: #f7f6f3;
    font-family: system-ui, sans-serif;
    font-size: 0.75rem;
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
    color: var(--text-muted);
}

.score-item {
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.score-item .dim-name {
    text-transform: capitalize;
}

.score-pair {
    font-weight: 600;
    color: var(--text);
}

/* ── Reasoning toggle ── */
.reasoning-toggle {
    padding: 0 1.2rem 0.8rem;
    background: #f7f6f3;
}

.reasoning-toggle summary {
    font-family: system-ui, sans-serif;
    font-size: 0.78rem;
    color: var(--accent-light);
    cursor: pointer;
}

.reasoning-toggle .reasoning-text {
    font-size: 0.85rem;
    margin-top: 0.4rem;
    color: var(--text-muted);
    line-height: 1.55;
}

/* ── Ask form ── */
#ask-form {
    margin-bottom: 1.2rem;
}

#ask-question {
    width: 100%;
    padding: 0.7rem 0.9rem;
    font-family: inherit;
    font-size: 0.95rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    resize: vertical;
    line-height: 1.5;
}

#ask-question:focus {
    outline: none;
    border-color: var(--accent-light);
    box-shadow: 0 0 0 2px rgba(41, 128, 185, 0.15);
}

.form-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 0.5rem;
}

.counter {
    font-family: system-ui, sans-serif;
    font-size: 0.78rem;
    color: var(--text-muted);
}

#ask-btn {
    padding: 0.55rem 1.2rem;
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: var(--radius);
    font-family: system-ui, sans-serif;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
}

#ask-btn:hover {
    background: var(--accent-light);
}

#ask-btn:disabled {
    background: #aaa;
    cursor: not-allowed;
}

/* ── Spinner ── */
.spinner {
    text-align: center;
    padding: 2rem;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.spinner-dot {
    width: 12px;
    height: 12px;
    background: var(--accent);
    border-radius: 50%;
    margin: 0 auto 0.8rem;
    animation: pulse 1.2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 0.3; transform: scale(0.8); }
    50% { opacity: 1; transform: scale(1.2); }
}

/* ── Cold-start notice ── */
.cold-start-notice {
    background: #fff8e8;
    border: 1px solid #e0d0a0;
    border-radius: var(--radius);
    padding: 0.7rem 1rem;
    margin-bottom: 1.2rem;
    font-family: system-ui, sans-serif;
    font-size: 0.82rem;
    color: #6b5a2a;
    line-height: 1.5;
}

.cold-start-notice strong {
    color: #4a3d1a;
}

/* ── Error ── */
.error-msg {
    background: #fdf0f0;
    border: 1px solid #e0b0b0;
    border-radius: var(--radius);
    padding: 0.8rem 1rem;
    color: #9b2c2c;
    font-size: 0.88rem;
}

/* ── Utility ── */
.hidden {
    display: none !important;
}

/* ── Footer ── */
footer {
    margin-top: 3rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
    text-align: center;
    font-size: 0.8rem;
    color: var(--text-muted);
}

footer p {
    margin-bottom: 0.2rem;
}