/* ============================================================
   Геологический факультет МГУ — Приёмная комиссия
   Дизайн-система: «керн» / осадочные слои
   ============================================================ */

:root {
  --paper:      #EDEAE1;
  --paper-dim:  #E3DFD3;
  --ink:        #23261F;
  --ink-soft:   #52544B;
  --line:       #C9C3B2;

  --azurite:    #2B5C82;
  --azurite-dk: #1E4560;
  --malachite:  #2F6B52;
  --malachite-dk: #21503D;
  --ochre:      #B8791A;
  --ochre-dk:   #8F5E12;
  --cinnabar:   #A63A2E;
  --cinnabar-dk:#7E2B21;

  --font-display: 'Fraunces', Georgia, serif;
  --font-body: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'IBM Plex Mono', 'Courier New', monospace;

  --radius: 6px;
  --wrap: 1120px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.15;
  margin: 0 0 0.5em;
  color: var(--ink);
}
h1 { font-size: clamp(2rem, 4vw, 3.1rem); font-weight: 500; }
h2 { font-size: clamp(1.5rem, 2.6vw, 2.1rem); }
h3 { font-size: 1.2rem; }
p { margin: 0 0 1em; }
a { color: var(--azurite-dk); }
a:hover { color: var(--cinnabar-dk); }
.muted { color: var(--ink-soft); font-size: 0.92em; }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }

.eyebrow {
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.78rem;
  color: var(--ink-soft);
  margin: 0 0 0.6em;
}

:focus-visible {
  outline: 3px solid var(--ochre);
  outline-offset: 2px;
}

/* -------------------- Керн-полоса (сигнатурный элемент) -------------------- */
.core-strip {
  display: flex;
  height: 6px;
  width: 100%;
}
.core-strip .layer { flex: 1; }
.layer--paper { background: var(--paper-dim); }
.layer--azurite { background: var(--azurite); }
.layer--malachite { background: var(--malachite); }
.layer--ochre { background: var(--ochre); }
.layer--cinnabar { background: var(--cinnabar); }

/* -------------------- Header -------------------- */
.site-header {
  background: var(--paper);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 50;
}
.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 14px;
  padding-bottom: 14px;
  gap: 16px;
}
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; color: var(--ink); }
.brand__mark {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.3rem;
  width: 42px; height: 42px;
  border-radius: 50%;
  background: var(--ink);
  color: var(--paper);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.brand__text { font-family: var(--font-display); font-size: 1.02rem; line-height: 1.25; }
.brand__text small { font-family: var(--font-mono); font-size: 0.68rem; color: var(--ink-soft); letter-spacing: 0.04em; }

.site-nav { display: flex; gap: 22px; flex-wrap: wrap; }
.site-nav a {
  text-decoration: none;
  color: var(--ink);
  font-size: 0.95rem;
  padding: 6px 0;
  border-bottom: 2px solid transparent;
}
.site-nav a:hover, .site-nav a.is-active { border-bottom-color: var(--ochre); color: var(--ink); }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px; height: 40px;
  background: none; border: 1px solid var(--line); border-radius: var(--radius);
  cursor: pointer;
}
.nav-toggle span { display: block; height: 2px; width: 18px; background: var(--ink); margin: 0 auto; }

/* -------------------- Hero -------------------- */
.hero { padding: 64px 0 48px; }
.hero--sub { padding: 48px 0 40px; border-bottom: 1px solid var(--line); }
.hero--sub.hero--azurite { background: linear-gradient(180deg, #DCE7EE, var(--paper)); }
.hero--sub.hero--malachite { background: linear-gradient(180deg, #DCEBE2, var(--paper)); }
.hero--sub.hero--ochre { background: linear-gradient(180deg, #F0E3C9, var(--paper)); }
.hero--sub.hero--cinnabar { background: linear-gradient(180deg, #EAD5D1, var(--paper)); }
.hero__lead { font-size: 1.15rem; color: var(--ink-soft); max-width: 60ch; }
.hero__cta { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 24px; }

/* -------------------- Buttons -------------------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-body); font-weight: 600; font-size: 0.98rem;
  padding: 13px 22px;
  border-radius: var(--radius);
  text-decoration: none;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform 0.12s ease, background 0.15s ease;
}
.btn--primary { background: var(--ink); color: var(--paper); }
.btn--primary:hover { background: var(--cinnabar-dk); color: var(--paper); transform: translateY(-1px); }
.btn--ghost { background: transparent; border-color: var(--ink); color: var(--ink); }
.btn--ghost:hover { background: var(--ink); color: var(--paper); }

/* -------------------- Sections -------------------- */
.section { padding: 56px 0; }
.section--tinted { background: var(--paper-dim); }
.section__lead { max-width: 68ch; color: var(--ink-soft); font-size: 1.05rem; }
.section__note { font-size: 0.92rem; color: var(--ink-soft); border-left: 3px solid var(--line); padding-left: 14px; margin-top: 24px; }
.section--cta { text-align: center; max-width: 640px; margin: 0 auto; }
.section--cta .btn { margin-top: 12px; }

.prose { max-width: 74ch; }
.prose h2 { margin-top: 1.6em; }

/* -------------------- Grids / Cards -------------------- */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-top: 28px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 28px; }

.card {
  display: block; text-decoration: none; color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--line);
  border-top: 5px solid var(--ink);
  border-radius: var(--radius);
  padding: 28px;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.card:hover { transform: translateY(-3px); box-shadow: 0 10px 24px rgba(35,38,31,0.1); }
.card--azurite { border-top-color: var(--azurite); }
.card--malachite { border-top-color: var(--malachite); }
.card--ochre { border-top-color: var(--ochre); }
.card--cinnabar { border-top-color: var(--cinnabar); }
.card__kicker { font-family: var(--font-mono); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--ink-soft); }
.card__link { display: inline-block; margin-top: 10px; font-weight: 600; }

.mini-card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
}
.mini-card--ochre { border-color: var(--ochre); background: #F3E7CC; }
.mini-card__num { display: block; font-family: var(--font-mono); font-size: 0.78rem; color: var(--ochre-dk); text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 6px; }

.stat-row { display: flex; flex-wrap: wrap; gap: 28px; margin-top: 32px; padding-top: 24px; border-top: 1px solid var(--line); }
.stat { min-width: 140px; }
.stat__num { display: block; font-family: var(--font-display); font-size: 2rem; color: var(--ink); }
.stat__label { font-size: 0.85rem; color: var(--ink-soft); }

.chip-list { list-style: none; display: flex; flex-wrap: wrap; gap: 10px; padding: 0; margin: 24px 0 0; }
.chip-list li {
  font-family: var(--font-mono); font-size: 0.85rem;
  background: var(--paper); border: 1px solid var(--line); border-radius: 999px;
  padding: 8px 16px;
}

/* -------------------- Timeline «керн» -------------------- */
.core-timeline__title { margin-bottom: 32px; }
.core-timeline__track { display: flex; flex-direction: column; }
.core-timeline__item { display: flex; gap: 18px; }
.core-timeline__marker { display: flex; flex-direction: column; align-items: center; }
.core-timeline__dot { width: 14px; height: 14px; border-radius: 50%; background: var(--azurite); border: 3px solid var(--paper); box-shadow: 0 0 0 1px var(--line); flex-shrink: 0; }
.core-timeline__item.is-deadline .core-timeline__dot { background: var(--cinnabar); }
.core-timeline__line { width: 2px; flex: 1; background: var(--line); margin: 2px 0; }
.core-timeline__body { padding-bottom: 28px; }
.core-timeline__date { font-family: var(--font-mono); font-size: 0.85rem; color: var(--ink-soft); display: flex; align-items: center; gap: 8px; }
.core-timeline__badge { font-family: var(--font-mono); font-size: 0.65rem; text-transform: uppercase; letter-spacing: 0.05em; background: var(--cinnabar); color: #fff; padding: 2px 8px; border-radius: 999px; }
.core-timeline__event { font-family: var(--font-display); font-size: 1.15rem; margin: 2px 0 4px; }
.core-timeline__desc { color: var(--ink-soft); font-size: 0.95rem; max-width: 58ch; margin: 0; }

/* -------------------- Документы -------------------- */
.doc-list { list-style: none; padding: 0; margin: 24px 0 0; display: flex; flex-direction: column; gap: 4px; }
.doc-list__item { padding: 14px 0; border-bottom: 1px solid var(--line); display: flex; justify-content: space-between; align-items: baseline; flex-wrap: wrap; gap: 6px; }
.doc-list__item a { font-weight: 600; text-decoration: none; }
.doc-list__item a:hover { text-decoration: underline; }
.doc-list__source { font-family: var(--font-mono); font-size: 0.78rem; color: var(--ink-soft); }

.doc-text {
  font-family: var(--font-mono);
  font-size: 0.94rem;
  line-height: 1.75;
  background: var(--paper-dim);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
  margin: 24px 0;
  white-space: normal;
}

/* -------------------- Опросник -------------------- */
.quiz-trail { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-bottom: 20px; font-family: var(--font-mono); font-size: 0.8rem; color: var(--ink-soft); }
.quiz-trail__sep { color: var(--line); }
.quiz-trail__item { background: var(--paper-dim); border-radius: 999px; padding: 4px 12px; }

.quiz-card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-top: 5px solid var(--ochre);
  border-radius: var(--radius);
  padding: 32px;
}
.quiz-help { font-family: var(--font-mono); font-size: 0.85rem; color: var(--ink-soft); margin-bottom: 6px; }
.quiz-question { margin-bottom: 22px; }
.quiz-options { display: flex; flex-direction: column; gap: 10px; }
.quiz-option {
  display: flex; justify-content: space-between; align-items: center;
  width: 100%; text-align: left;
  background: var(--paper-dim);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px 20px;
  font-family: var(--font-body); font-size: 1rem; color: var(--ink);
  cursor: pointer;
  transition: background 0.12s ease, border-color 0.12s ease;
}
.quiz-option:hover { background: #E4DCC4; border-color: var(--ochre); }
.quiz-option__arrow { color: var(--ochre-dk); font-weight: 700; }

.quiz-back {
  margin-top: 18px;
  background: none; border: none; color: var(--ink-soft);
  font-family: var(--font-body); font-size: 0.9rem; cursor: pointer; text-decoration: underline;
  padding: 0;
}

.quiz-result {
  background: var(--paper);
  border: 1px solid var(--line);
  border-top: 5px solid var(--malachite);
  border-radius: var(--radius);
  padding: 32px;
}
.quiz-result__summary { font-size: 1.05rem; color: var(--ink-soft); max-width: 62ch; }
.quiz-result__grid { margin-top: 20px; }
.result-block { background: var(--paper-dim); border-radius: var(--radius); padding: 20px 24px; }
.result-block ul { margin: 0; padding-left: 20px; }
.result-block li { margin-bottom: 6px; }
.result-block--wide { margin-top: 20px; }
.quiz-result__actions { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 28px; }

/* -------------------- Footer -------------------- */
.site-footer { background: var(--ink); color: var(--paper); padding: 48px 0 20px; margin-top: 40px; }
.site-footer__inner { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 32px; }
.site-footer h3 { color: var(--paper); font-size: 0.95rem; font-family: var(--font-mono); text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 10px; }
.site-footer a { color: var(--paper); }
.site-footer .muted { color: #B9B6A8; }
.site-footer p { margin: 0 0 8px; }
.brand--footer { color: var(--paper); margin-bottom: 12px; }
.brand--footer .brand__mark { background: var(--paper); color: var(--ink); }
.site-footer__legal { border-top: 1px solid #3B3E33; margin-top: 32px; padding-top: 18px; font-size: 0.82rem; color: #B9B6A8; }
.site-footer__legal p { margin-bottom: 6px; }

/* -------------------- Responsive -------------------- */
@media (max-width: 860px) {
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .site-footer__inner { grid-template-columns: 1fr; }
}

@media (max-width: 720px) {
  .nav-toggle { display: flex; }
  .site-nav {
    display: none;
    position: absolute; left: 0; right: 0; top: 100%;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    gap: 0;
    padding: 8px 24px 16px;
  }
  .site-nav.is-open { display: flex; }
  .site-nav a { padding: 10px 0; }
}