:root {
    --bg-color: #0d0e11;
    --text-color: #e4e4e7;
    --text-dim: #a8a8b3;
    --accent-color: #2563eb;
    --accent-hover: #1d4ed8;
    --card-bg: #18191e;
    --card-bg-2: #14151a;
    --border-color: #27272a;
    --radius: 8px;
}

* { box-sizing: border-box; }

body {
    font-family: 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    margin: 0;
    padding: 0;
    font-size: 16px;
}

a { color: inherit; }

/* ---------- Header / Nav ---------- */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 2rem;
    border-bottom: 1px solid var(--border-color);
    flex-wrap: wrap;
    gap: 1rem;
}
.logo {
    font-size: 1.3rem;
    font-weight: 800;
    letter-spacing: 0.15em;
    color: #ffffff;
    text-decoration: none;
    white-space: nowrap;
}
nav { display: flex; flex-wrap: wrap; gap: 0.25rem 1.25rem; }
nav a {
    color: var(--accent-color);
    text-decoration: none;
    font-size: 0.95rem;
}
nav a:hover { color: var(--accent-hover); text-decoration: underline; }
nav a.active { color: #ffffff; font-weight: bold; }

/* ---------- Breadcrumbs ---------- */
.breadcrumbs {
    max-width: 800px;
    margin: 1.5rem auto 0;
    padding: 0 1.5rem;
    font-size: 0.85rem;
    color: var(--text-dim);
}
.breadcrumbs a { color: var(--text-dim); text-decoration: none; }
.breadcrumbs a:hover { color: var(--accent-color); }
.breadcrumbs span.sep { margin: 0 0.4rem; color: #51525c; }

/* ---------- Main / Typography ---------- */
main {
    max-width: 800px;
    margin: 1.5rem auto 4rem;
    padding: 0 1.5rem;
}
main.wide { max-width: 1000px; }
h1 { color: #ffffff; font-size: 2.3rem; line-height: 1.3; margin-bottom: 0.5rem; }
h2 { color: #ffffff; font-size: 1.6rem; margin-top: 2.6rem; margin-bottom: 1rem; }
h3 { color: #ffffff; font-size: 1.2rem; margin-top: 1.8rem; margin-bottom: 0.6rem; }
.subtitle { color: var(--accent-color); font-size: 1.15rem; font-weight: 600; margin-bottom: 1.5rem; }
p { font-size: 1rem; color: var(--text-color); }
small, .meta-note { font-size: 13px; color: var(--text-dim); }
ul.plain { padding-left: 1.2rem; }
ul.plain li { margin-bottom: 0.6rem; }

/* ---------- Quick Answer block (GEO) ---------- */
.quick-answer {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-left: 4px solid var(--accent-color);
    border-radius: 0 var(--radius) var(--radius) 0;
    padding: 1.25rem 1.5rem;
    margin: 1.5rem 0 2rem;
    font-size: 1.02rem;
}
.quick-answer strong { color: #fff; }

/* ---------- Hero (author) ---------- */
.author-hero { display: flex; gap: 2.5rem; align-items: center; margin: 2rem 0 3rem; }
.author-photo-wrapper {
    flex: 0 0 260px; max-width: 260px; height: 320px;
    overflow: hidden; border-radius: var(--radius);
    border: 1px solid var(--border-color);
    box-shadow: 0 20px 40px rgba(0,0,0,0.5);
}
.author-photo-wrapper img { width: 100%; height: 100%; object-fit: cover; object-position: center top; display: block; }
.author-bio-intro { flex: 1; }
@media (max-width: 640px) {
    .author-hero { flex-direction: column; text-align: center; }
    .author-photo-wrapper { margin: 0 auto; }
}

/* ---------- Profile / quote box ---------- */
.profile-box {
    background: var(--card-bg);
    border-left: 4px solid var(--accent-color);
    padding: 1.75rem 2rem;
    border-radius: 0 var(--radius) var(--radius) 0;
    margin: 2.5rem 0;
    font-style: italic;
    color: #d4d4d8;
}
.profile-box p { font-size: 1.02rem; margin: 0; }

/* ---------- Fact / card grids ---------- */
.fact-grid, .symptom-grid, .geo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.25rem;
    margin: 2rem 0;
}
.fact-card, .symptom-card, .geo-card {
    background: var(--card-bg-2);
    border: 1px solid var(--border-color);
    padding: 1.4rem;
    border-radius: 6px;
    transition: transform 0.25s ease, border-color 0.25s ease;
}
.fact-card strong { color: #ffffff; font-size: 1.4rem; display: block; margin-bottom: 0.5rem; }
a.symptom-card, a.geo-card { display: block; text-decoration: none; color: inherit; }
a.symptom-card strong, a.geo-card strong { color: #fff; display: block; margin-bottom: 0.4rem; font-size: 1.02rem; }
a.symptom-card p, a.geo-card p { margin: 0; font-size: 0.9rem; color: var(--text-dim); }
/* lightweight CSS-only "3D tilt" on hover — no WebGL cost */
a.symptom-card, a.geo-card { will-change: transform; }
a.symptom-card:hover, a.geo-card:hover {
    transform: translateY(-3px) rotateX(2deg);
    border-color: var(--accent-color);
}

/* ---------- Comparison table ---------- */
table.compare { width: 100%; border-collapse: collapse; margin: 1.5rem 0; font-size: 0.95rem; }
table.compare th, table.compare td { border: 1px solid var(--border-color); padding: 0.8rem 1rem; text-align: left; vertical-align: top; }
table.compare th { background: var(--card-bg); color: #fff; }
table.compare td { background: var(--card-bg-2); }

/* ---------- FAQ accordion ---------- */
.faq-item { border-bottom: 1px solid var(--border-color); }
.faq-q {
    width: 100%; text-align: left; background: none; border: none; color: #fff;
    font-size: 1.02rem; font-weight: 600; padding: 1.1rem 0; cursor: pointer;
    display: flex; justify-content: space-between; align-items: center; gap: 1rem;
}
.faq-q::after { content: "+"; color: var(--accent-color); font-size: 1.4rem; flex-shrink: 0; }
.faq-item.open .faq-q::after { content: "−"; }
.faq-a { display: none; padding: 0 0 1.1rem; color: var(--text-dim); font-size: 0.95rem; }
.faq-item.open .faq-a { display: block; }

/* ---------- Related links ---------- */
.related-links { margin: 2.5rem 0; padding: 1.5rem; background: var(--card-bg-2); border-radius: var(--radius); border: 1px solid var(--border-color); }
.related-links h2 { margin-top: 0; font-size: 1.1rem; }
.related-links ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 0.5rem; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.related-links a { color: var(--accent-color); text-decoration: none; font-size: 0.92rem; }
.related-links a:hover { text-decoration: underline; }

/* ---------- CTA ---------- */
.cta-block { background: var(--card-bg); border: 1px solid var(--border-color); padding: 2.2rem; border-radius: var(--radius); text-align: center; margin: 3rem 0; }
.btn-cta { display: inline-block; background: var(--accent-color); color: #ffffff; padding: 0.95rem 2.2rem; text-decoration: none; border-radius: 6px; font-weight: 600; font-size: 1.05rem; transition: background 0.3s; margin-top: 1.2rem; }
.btn-cta:hover { background: var(--accent-hover); }

/* ---------- 3D model wrapper ---------- */
.model-3d-wrapper {
    margin: 2rem 0;
    min-height: 320px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    background: radial-gradient(circle at 50% 30%, #15161c 0%, #0d0e11 100%);
    overflow: hidden;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--text-dim);
    font-size: 0.9rem;
    padding: 1rem;
}
.model-3d-wrapper canvas { display: block; width: 100%; height: 100%; cursor: grab; }
.model-3d-wrapper canvas:active { cursor: grabbing; }
.model-3d-caption {
    font-size: 13px; color: var(--text-dim); padding: 0.7rem 1rem;
    border-top: 1px solid var(--border-color); background: var(--card-bg);
}
.model-3d-fallback {
    display: flex; align-items: center; justify-content: center;
    min-height: 260px; color: var(--text-dim); font-size: 0.9rem; padding: 1rem; text-align: center;
}
.model-3d-hint { font-size: 12px; color: #6b6c76; padding: 0.4rem 1rem 0.7rem; }

/* ---------- Audio player (Cholpon-Ata) ---------- */
.audio-player { background: var(--card-bg); border: 1px solid var(--border-color); border-radius: var(--radius); padding: 1.4rem; margin: 1.5rem 0; }
.audio-player .now-playing { color: #fff; font-weight: 600; margin-bottom: 0.6rem; font-size: 0.98rem; }
.audio-player audio { width: 100%; margin: 0.6rem 0; }
.audio-player .playlist { list-style: none; padding: 0; margin: 0.8rem 0 0; }
.audio-player .playlist li { padding: 0.55rem 0.2rem; border-top: 1px solid var(--border-color); font-size: 0.92rem; cursor: pointer; display: flex; justify-content: space-between; gap: 0.5rem; }
.audio-player .playlist li.active { color: var(--accent-color); }
.audio-player .playlist li.disabled { color: #54555f; cursor: default; }
.audio-player .tag-soon { font-size: 11px; border: 1px solid var(--border-color); border-radius: 4px; padding: 0.1rem 0.4rem; color: var(--text-dim); }

/* ---------- Disclaimer ---------- */
.practice-disclaimer { font-size: 13px; color: var(--text-dim); border-top: 1px solid var(--border-color); padding-top: 1.2rem; margin-top: 3rem; }

/* ---------- Footer ---------- */
footer { border-top: 1px solid var(--border-color); padding: 2rem; text-align: center; color: var(--text-dim); font-size: 13px; margin-top: 2rem; }
footer a { color: var(--text-dim); text-decoration: none; }
footer a:hover { color: var(--accent-color); }

@media (max-width: 640px) {
    h1 { font-size: 1.8rem; }
    header { padding: 1.1rem 1.25rem; }
}