/* ══════════════════════════════════════════════
   gordeev-math.ru — общие стили
   ══════════════════════════════════════════════ */

/* ── ПАЛИТРЫ ──────────────────────────────────── */
:root[data-theme="b"] {
  --bg:      #1A2520;
  --bg2:     #22302a;
  --bg3:     #2a3d34;
  --accent:  #7BC49A;
  --accent2: #5aab7e;
  --text:    #e8f0eb;
  --muted:   #8aab96;
  --border:  #3a5045;
}
:root[data-theme="v"] {
  --bg:      #1C1916;
  --bg2:     #262119;
  --bg3:     #342c22;
  --accent:  #C4784A;
  --accent2: #a85e34;
  --text:    #f0ebe6;
  --muted:   #9e8878;
  --border:  #4a3828;
}
:root[data-theme="g"] {
  --bg:      #0E1520;
  --bg2:     #161f2e;
  --bg3:     #1e2d42;
  --accent:  #60A8C0;
  --accent2: #4288a0;
  --text:    #e4edf2;
  --muted:   #6e9aae;
  --border:  #2a4060;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: 'Jost', sans-serif;
  background: var(--bg);
  color: var(--text);
  font-weight: 300;
  line-height: 1.7;
  min-height: 100vh;
}

img { max-width: 100%; }
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent2); }

/* ── ТИПОГРАФИКА ──────────────────────────────── */
h1, h2, h3, h4 {
  font-family: 'Cormorant Garamond', serif;
  font-weight: 500;
  line-height: 1.15;
  color: var(--accent);
}
h1 { font-size: clamp(2.4rem, 5vw, 3.8rem); }
h2 { font-size: clamp(1.8rem, 3.5vw, 2.6rem); }
h3 { font-size: clamp(1.3rem, 2.5vw, 1.8rem); }
h4 { font-size: 1.1rem; }

p { font-size: .95rem; line-height: 1.75; }

.mono {
  font-family: 'DM Mono', monospace;
}
.label {
  font-family: 'DM Mono', monospace;
  font-size: .72rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--accent);
}
.muted { color: var(--muted); }
.hi { color: var(--accent); font-weight: 500; }

/* ── РАСКЛАДКА ────────────────────────────────── */
.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 32px;
}

section {
  padding: 80px 0;
}
section + section {
  border-top: 1px solid var(--border);
}

.section-label {
  font-family: 'DM Mono', monospace;
  font-size: .7rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 12px;
}
.section-title {
  margin-bottom: 40px;
}
.accent-line {
  width: 48px; height: 3px;
  background: var(--accent);
  border-radius: 2px;
  margin: 16px 0 32px;
}

/* ── ШАПКА ────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  background: color-mix(in srgb, var(--bg) 90%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}
.site-logo {
  font-family: 'Cormorant Garamond', serif;
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--text);
  letter-spacing: .02em;
}
.site-logo span { color: var(--accent); }

.site-nav {
  display: flex;
  gap: 28px;
  list-style: none;
}
.site-nav a {
  font-size: .82rem;
  font-weight: 400;
  color: var(--muted);
  letter-spacing: .04em;
  transition: color .2s;
}
.site-nav a:hover { color: var(--accent); }

/* ── ПЕРЕКЛЮЧАТЕЛЬ ПАЛИТР ─────────────────────── */
.palette-switcher {
  display: flex;
  gap: 8px;
  align-items: center;
}
.pal-btn {
  width: 20px; height: 20px;
  border-radius: 50%;
  border: 2px solid transparent;
  cursor: pointer;
  transition: border-color .2s, transform .2s;
  padding: 0;
  outline: none;
}
.pal-btn:hover { transform: scale(1.2); }
.pal-btn.active { border-color: var(--text); }
.pal-btn[data-pal="b"] { background: #7BC49A; }
.pal-btn[data-pal="v"] { background: #C4784A; }
.pal-btn[data-pal="g"] { background: #60A8C0; }

/* ── ГЕРОЙ ────────────────────────────────────── */
.hero {
  padding: 100px 0 80px;
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--border);
}
.hero::before {
  content: '';
  position: absolute;
  top: -120px; right: -100px;
  width: 500px; height: 500px;
  border-radius: 50%;
  background: radial-gradient(circle, color-mix(in srgb, var(--accent) 10%, transparent) 0%, transparent 70%);
  pointer-events: none;
}
.hero-tag {
  font-family: 'DM Mono', monospace;
  font-size: .72rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 20px;
}
.hero h1 { margin-bottom: 12px; }
.hero-sub {
  font-size: 1.05rem;
  color: var(--muted);
  font-weight: 300;
  max-width: 480px;
  margin-bottom: 40px;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }

/* ── КНОПКИ ───────────────────────────────────── */
.btn {
  font-family: 'Jost', sans-serif;
  font-size: .85rem;
  font-weight: 400;
  padding: 11px 28px;
  border-radius: 6px;
  border: 1px solid var(--border);
  cursor: pointer;
  transition: background .2s, border-color .2s, color .2s;
  text-decoration: none;
  display: inline-block;
}
.btn-primary {
  background: var(--accent);
  color: var(--bg);
  border-color: var(--accent);
}
.btn-primary:hover {
  background: var(--accent2);
  border-color: var(--accent2);
  color: var(--bg);
}
.btn-outline {
  background: transparent;
  color: var(--text);
}
.btn-outline:hover {
  background: var(--bg3);
  border-color: var(--accent);
  color: var(--accent);
}

/* ── КАРТОЧКИ ─────────────────────────────────── */
.cards {
  display: grid;
  gap: 20px;
}
.cards-2 { grid-template-columns: 1fr 1fr; }
.cards-3 { grid-template-columns: 1fr 1fr 1fr; }

.card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px 26px;
  transition: border-color .2s;
}
.card:hover { border-color: var(--accent); }
.card-label {
  font-family: 'DM Mono', monospace;
  font-size: .68rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 10px;
}
.card h4 { color: var(--text); margin-bottom: 8px; font-size: 1rem; }
.card p { font-size: .88rem; color: var(--muted); }

/* ── МАТЕРИАЛЫ ────────────────────────────────── */
.materials-filters {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 28px;
}
.filter-btn {
  font-family: 'DM Mono', monospace;
  font-size: .72rem;
  letter-spacing: .06em;
  padding: 6px 14px;
  border-radius: 20px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  transition: all .2s;
}
.filter-btn:hover,
.filter-btn.active {
  border-color: var(--accent);
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 8%, transparent);
}

.materials-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.material-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px 22px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: border-color .2s;
  text-decoration: none;
  color: var(--text);
}
.material-card:hover { border-color: var(--accent); color: var(--text); }
.material-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
}
.material-title {
  font-family: 'Cormorant Garamond', serif;
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--text);
  line-height: 1.3;
}
.material-badge {
  font-family: 'DM Mono', monospace;
  font-size: .65rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  padding: 3px 8px;
  border-radius: 4px;
  border: 1px solid var(--border);
  color: var(--muted);
  white-space: nowrap;
  flex-shrink: 0;
}
.material-desc {
  font-size: .83rem;
  color: var(--muted);
  line-height: 1.5;
}
.material-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}
.tag {
  font-family: 'DM Mono', monospace;
  font-size: .62rem;
  letter-spacing: .06em;
  padding: 2px 7px;
  border-radius: 3px;
  background: var(--bg3);
  color: var(--muted);
}

/* ── ДОСТИЖЕНИЯ ───────────────────────────────── */
.achievements-list {
  display: grid;
  gap: 16px;
}
.achievement {
  display: flex;
  gap: 20px;
  align-items: flex-start;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px 24px;
}
.achievement-year {
  font-family: 'DM Mono', monospace;
  font-size: .78rem;
  color: var(--accent);
  white-space: nowrap;
  margin-top: 2px;
}
.achievement-text { font-size: .9rem; line-height: 1.6; }

/* ── КОНТАКТЫ ─────────────────────────────────── */
.contacts-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  max-width: 520px;
}
.contact-item {
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 18px 20px;
  text-decoration: none;
  color: var(--text);
  transition: border-color .2s;
}
.contact-item:hover { border-color: var(--accent); color: var(--text); }
.contact-icon {
  font-size: 1.2rem;
  width: 36px;
  text-align: center;
  flex-shrink: 0;
}
.contact-label {
  font-family: 'DM Mono', monospace;
  font-size: .65rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 2px;
}
.contact-value {
  font-size: .88rem;
  color: var(--text);
}

/* ── ПОДВАЛ ───────────────────────────────────── */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 28px 0;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.footer-copy {
  font-family: 'DM Mono', monospace;
  font-size: .72rem;
  color: var(--muted);
  letter-spacing: .04em;
}

/* ── АДАПТИВ ──────────────────────────────────── */
@media (max-width: 768px) {
  .container { padding: 0 16px; }
  section { padding: 48px 0; }

  /* Шапка: лого + палитра в одну строку, nav — горизонтальная полоса под ними */
  .site-header { position: sticky; }
  .header-inner {
    flex-wrap: wrap;
    height: auto;
    padding: 12px 0 0;
    gap: 0;
  }
  .site-logo { flex: 1; padding-bottom: 12px; }
  .palette-switcher { padding-bottom: 12px; }
  .site-nav {
    display: flex;
    order: 3;
    width: 100%;
    overflow-x: auto;
    gap: 0;
    border-top: 1px solid var(--border);
    padding: 0;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }
  .site-nav::-webkit-scrollbar { display: none; }
  .site-nav li { flex-shrink: 0; }
  .site-nav a {
    display: block;
    padding: 10px 16px;
    font-size: .8rem;
    white-space: nowrap;
  }

  /* Герой */
  .hero { padding: 48px 0 40px; overflow: hidden; }
  .hero::before { width: 300px; height: 300px; top: -60px; right: -60px; }
  .hero h1 { font-size: clamp(2rem, 8vw, 3rem); }
  .hero-sub { font-size: .92rem; }
  .hero-actions { gap: 10px; }
  .btn { padding: 10px 20px; font-size: .82rem; }

  /* Сетки */
  .cards-2, .cards-3 { grid-template-columns: 1fr; }
  .materials-grid { grid-template-columns: 1fr; }
  .contacts-grid { grid-template-columns: 1fr; max-width: 100%; }

  /* О себе */
  .cards-2[style] { max-width: 100% !important; }

  /* Достижения */
  .achievement { flex-direction: column; gap: 8px; }

  /* Подвал */
  .footer-inner { flex-direction: column; gap: 6px; text-align: center; }
}