/* ===== Root Variables (Dark/Light адаптация) ===== */
:root {
  --bg-primary: #0f1117;
  --bg-secondary: #1a1d27;
  --bg-card: #222631;
  --bg-hover: #2a2f3d;
  --text-primary: #e8edf5;
  --text-secondary: #9aa4b8;
  --text-muted: #6b758c;
  --accent: #6c7cff;
  --accent-glow: rgba(108, 124, 255, 0.25);
  --border: #2e3342;
  --radius: 16px;
  --shadow: 0 8px 32px rgba(0,0,0,0.4);
  --transition: 0.2s ease;
}

/* ===== Global Reset ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  padding: 20px;
}

/* ===== Layout ===== */
.forum-container {
  max-width: 1200px;
  margin: 0 auto;
}

/* ===== Header ===== */
.forum-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 24px;
  background: var(--bg-secondary);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  margin-bottom: 28px;
  flex-wrap: wrap;
  gap: 12px;
}

.logo {
  font-weight: 700;
  font-size: 1.4rem;
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, var(--accent), #a78bfa);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.header-actions {
  display: flex;
  gap: 12px;
  align-items: center;
}

/* ===== Buttons ===== */
.btn {
  padding: 8px 18px;
  border: none;
  border-radius: 40px;
  font-weight: 500;
  font-size: 0.9rem;
  cursor: pointer;
  transition: var(--transition);
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border);
}
.btn-primary {
  background: var(--accent);
  color: #fff;
  border: none;
  box-shadow: 0 0 20px var(--accent-glow);
}
.btn-primary:hover {
  filter: brightness(1.15);
  transform: scale(1.02);
}
.btn-outline {
  background: transparent;
  border: 1px solid var(--border);
}
.btn-outline:hover {
  background: var(--bg-hover);
}

/* ===== Search ===== */
.search-bar {
  display: flex;
  background: var(--bg-card);
  border-radius: 40px;
  border: 1px solid var(--border);
  padding: 4px 4px 4px 18px;
  align-items: center;
  min-width: 200px;
}
.search-bar input {
  background: transparent;
  border: none;
  color: var(--text-primary);
  padding: 8px 0;
  width: 100%;
  outline: none;
  font-size: 0.9rem;
}
.search-bar input::placeholder {
  color: var(--text-muted);
}
.search-bar button {
  background: var(--accent);
  border: none;
  border-radius: 40px;
  padding: 8px 16px;
  color: #fff;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
}
.search-bar button:hover {
  filter: brightness(1.1);
}

/* ===== Categories / Tabs ===== */
.category-tabs {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}
.category-tab {
  padding: 8px 20px;
  border-radius: 40px;
  background: var(--bg-secondary);
  color: var(--text-secondary);
  border: 1px solid transparent;
  cursor: pointer;
  transition: var(--transition);
  font-weight: 500;
  font-size: 0.9rem;
}
.category-tab:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}
.category-tab.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  box-shadow: 0 0 20px var(--accent-glow);
}

/* ===== Topic List ===== */
.topic-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.topic-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 20px;
  background: var(--bg-secondary);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  transition: var(--transition);
  cursor: pointer;
  flex-wrap: wrap;
}
.topic-item:hover {
  background: var(--bg-hover);
  border-color: var(--accent);
  transform: translateX(4px);
}

.topic-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  color: #fff;
  flex-shrink: 0;
  background: linear-