:root {
  --bg: #f7f8fb;
  --bg-elevated: #ffffff;
  --bg-muted: #eef0f5;
  --text: #14161c;
  --text-muted: #5b6070;
  --border: #e4e6ee;
  --accent: #2f6fed;
  --accent-hover: #2359c9;
  --accent-contrast: #ffffff;
  --danger: #e5484d;
  --success: #2fb344;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(20, 22, 28, 0.04), 0 8px 24px rgba(20, 22, 28, 0.06);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Inter", Arial, sans-serif;
}

html[data-theme="dark"] {
  --bg: #0f1115;
  --bg-elevated: #171a21;
  --bg-muted: #1e222b;
  --text: #eef0f5;
  --text-muted: #9aa0b2;
  --border: #262b36;
  --accent: #5b8cff;
  --accent-hover: #7ba0ff;
  --accent-contrast: #0f1115;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px rgba(0, 0, 0, 0.35);
}

* { box-sizing: border-box; }
html { color-scheme: light dark; }

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  transition: background 0.2s ease, color 0.2s ease;
}

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

.container {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border);
}
.site-header .container {
  display: flex;
  align-items: center;
  gap: 16px;
  height: 64px;
}
.brand {
  font-weight: 800;
  font-size: 1.15rem;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
}
.brand .dot { color: var(--accent); }
.main-nav {
  display: none;
  gap: 20px;
  margin-left: 8px;
}
.main-nav a { color: var(--text-muted); font-weight: 600; font-size: 0.95rem; }
.main-nav a:hover { color: var(--text); }
.header-spacer { flex: 1; }

.theme-toggle, .menu-toggle {
  border: 1px solid var(--border);
  background: var(--bg-muted);
  color: var(--text);
  border-radius: 10px;
  width: 40px;
  height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.1rem;
}
.menu-toggle { display: inline-flex; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: 10px;
  padding: 10px 18px;
  font-weight: 700;
  font-size: 0.95rem;
  border: 1px solid transparent;
  cursor: pointer;
  white-space: nowrap;
}
.btn-primary { background: var(--accent); color: var(--accent-contrast); }
.btn-primary:hover { background: var(--accent-hover); color: var(--accent-contrast); }
.btn-outline { background: transparent; border-color: var(--border); color: var(--text); }
.btn-outline:hover { border-color: var(--accent); color: var(--accent); }
.btn-block { width: 100%; }
.btn-sm { padding: 7px 12px; font-size: 0.85rem; }

.mobile-nav {
  display: none;
  flex-direction: column;
  border-bottom: 1px solid var(--border);
  background: var(--bg-elevated);
  padding: 8px 20px 16px;
}
.mobile-nav.open { display: flex; }
.mobile-nav a { padding: 10px 0; color: var(--text); font-weight: 600; border-bottom: 1px solid var(--border); }
.mobile-nav a:last-child { border-bottom: none; }

/* Hero */
.hero {
  padding: 56px 0 40px;
  text-align: center;
}
.hero h1 {
  font-size: clamp(1.8rem, 5vw, 2.75rem);
  margin: 0 0 12px;
  font-weight: 800;
  letter-spacing: -0.02em;
}
.hero p {
  color: var(--text-muted);
  max-width: 640px;
  margin: 0 auto 28px;
  font-size: 1.05rem;
}
.hero-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

.search-box {
  max-width: 480px;
  margin: 28px auto 0;
  display: flex;
  gap: 8px;
}
.search-box input {
  flex: 1;
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  color: var(--text);
  font-size: 0.95rem;
}
.search-box input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }

/* Category chips */
.chip-row {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding: 4px 0 20px;
  scrollbar-width: none;
}
.chip-row::-webkit-scrollbar { display: none; }
.chip {
  flex: 0 0 auto;
  background: var(--bg-muted);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 0.88rem;
  font-weight: 600;
  white-space: nowrap;
}
.chip.active, .chip:hover { border-color: var(--accent); color: var(--accent); }

/* Section */
.section { padding: 32px 0; }
.section-title {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 18px;
}
.section-title h2 { font-size: 1.35rem; margin: 0; }
.section-title .muted { color: var(--text-muted); font-size: 0.9rem; }

/* Group grid */
.grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
@media (min-width: 640px) { .grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 960px) { .grid { grid-template-columns: repeat(3, 1fr); } }

.card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.card-top { display: flex; gap: 12px; align-items: center; }
.card-avatar {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--bg-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  color: var(--accent);
  overflow: hidden;
  flex-shrink: 0;
}
.card-avatar img { width: 100%; height: 100%; object-fit: cover; }
.card-title { font-weight: 700; font-size: 1.02rem; }
.card-meta { color: var(--text-muted); font-size: 0.82rem; }
.card-desc {
  color: var(--text-muted);
  font-size: 0.9rem;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 999px;
  background: rgba(47, 111, 237, 0.12);
  color: var(--accent);
}
.card-footer { display: flex; gap: 8px; margin-top: auto; }

.empty-state {
  text-align: center;
  padding: 48px 20px;
  color: var(--text-muted);
}

/* Category page header */
.page-head { padding: 40px 0 20px; }
.page-head h1 { margin: 0 0 8px; font-size: 1.9rem; }
.page-head p { color: var(--text-muted); margin: 0; }

/* Group detail */
.group-detail {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  margin: 32px 0;
  box-shadow: var(--shadow);
}
.group-detail-head { display: flex; gap: 18px; align-items: center; margin-bottom: 16px; flex-wrap: wrap; }
.group-detail .card-avatar { width: 72px; height: 72px; border-radius: 16px; font-size: 1.5rem; }
.group-detail h1 { margin: 0 0 6px; font-size: 1.6rem; }
.group-stats { display: flex; gap: 18px; margin: 20px 0; flex-wrap: wrap; }
.stat { color: var(--text-muted); font-size: 0.88rem; }
.stat b { color: var(--text); display: block; font-size: 1.2rem; }

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 32px 0;
  margin-top: 48px;
  color: var(--text-muted);
  font-size: 0.88rem;
}
.footer-links { display: flex; gap: 18px; flex-wrap: wrap; margin-top: 10px; }

/* 404 */
.not-found { text-align: center; padding: 100px 20px; }
.not-found h1 { font-size: 4rem; margin: 0; color: var(--accent); }

@media (min-width: 860px) {
  .main-nav { display: flex; }
  .menu-toggle { display: none; }
}

/* Chat */
.chat-wrap {
  max-width: 720px;
  margin: 24px auto;
  padding: 0 20px;
}
.chat-panel {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  height: 70vh;
  min-height: 420px;
  overflow: hidden;
}
.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.chat-msg { max-width: 85%; }
.chat-msg .name { font-size: 0.78rem; font-weight: 700; color: var(--accent); margin-bottom: 2px; }
.chat-msg .bubble {
  background: var(--bg-muted);
  border-radius: 12px;
  padding: 8px 12px;
  font-size: 0.92rem;
  word-wrap: break-word;
}
.chat-msg.me { align-self: flex-end; }
.chat-msg.me .bubble { background: var(--accent); color: var(--accent-contrast); }
.chat-input-row {
  display: flex;
  gap: 8px;
  padding: 12px;
  border-top: 1px solid var(--border);
}
.chat-input-row input {
  flex: 1;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
}
.chat-login-gate {
  text-align: center;
  padding: 48px 20px;
}
.chat-login-gate p { color: var(--text-muted); margin-bottom: 16px; }
#telegram-login-container { display: inline-block; }
.chat-status { font-size: 0.8rem; color: var(--text-muted); padding: 4px 16px; }