:root {
  --bg-primary: #000000;
  --bg-secondary: #0a0a0a;
  --bg-elevated: #141414;
  --accent: #00C896;
  --accent-hover: #00a87d;
  --text-primary: #FFFFFF;
  --text-secondary: #B0B0B0;
  --border: #1F1F1F;
  --danger: #EF4444;
  --radius: 10px;
  --font: 'Inter', sans-serif;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: var(--font); background: var(--bg-primary); color: var(--text-primary); line-height: 1.6; min-height: 100vh; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: none; }
img { max-width: 100%; height: auto; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 1.5rem; }
.auth-container { display: flex; align-items: center; justify-content: center; min-height: 100vh; background: var(--bg-primary); }
.auth-card { background: var(--bg-secondary); border: 1px solid var(--border); border-radius: var(--radius); padding: 3rem 2rem; width: 100%; max-width: 440px; }
.auth-header { text-align: center; margin-bottom: 2rem; }
.logo { display: flex; align-items: center; justify-content: center; gap: 0.5rem; font-size: 1.4rem; font-weight: 700; color: var(--text-primary); }
.logo-text { color: var(--text-primary); }
.auth-form { display: flex; flex-direction: column; gap: 1.5rem; }
.form-group { display: flex; flex-direction: column; gap: 0.3rem; }
.form-label { font-size: 0.85rem; color: var(--text-secondary); text-transform: uppercase; letter-spacing: 0.5px; }
.form-input { background: var(--bg-primary); border: 1px solid var(--border); border-radius: var(--radius); color: var(--text-primary); padding: 0.9rem; font-size: 0.95rem; font-family: var(--font); }
.form-input:focus { outline: none; border-color: var(--accent); }
.btn { display: inline-flex; align-items: center; justify-content: center; padding: 0.8rem 2rem; border: none; border-radius: 30px; font-weight: 600; cursor: pointer; font-size: 0.9rem; transition: all 0.3s; text-transform: uppercase; letter-spacing: 0.3px; }
.btn-primary { background: var(--accent); color: #000; }
.btn-primary:hover { background: var(--accent-hover); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-sm { padding: 0.4rem 1.2rem; font-size: 0.8rem; }
.btn-block { width: 100%; }
.auth-footer { text-align: center; margin-top: 1.5rem; font-size: 0.85rem; color: var(--text-secondary); }
.navbar { background: rgba(0,0,0,0.85); backdrop-filter: blur(12px); border-bottom: 1px solid var(--border); padding: 0 2rem; height: 60px; display: flex; align-items: center; justify-content: space-between; position: sticky; top: 0; z-index: 100; }
.nav-links { display: flex; gap: 2rem; align-items: center; }
.nav-links a { color: var(--text-secondary); font-weight: 500; text-transform: uppercase; font-size: 0.8rem; letter-spacing: 1px; }
.nav-links a:hover { color: var(--accent); }
.nav-user { display: flex; align-items: center; gap: 1rem; }
.main-layout { display: flex; min-height: calc(100vh - 60px); }
.sidebar { width: 260px; background: var(--bg-secondary); border-right: 1px solid var(--border); padding: 1.5rem 1rem; flex-shrink: 0; position: sticky; top: 60px; height: calc(100vh - 60px); overflow-y: auto; }
.sidebar-links { display: flex; flex-direction: column; gap: 0.3rem; }
.sidebar-links a { display: block; padding: 0.7rem 1rem; border-radius: var(--radius); color: var(--text-secondary); font-size: 0.9rem; }
.sidebar-links a:hover, .sidebar-links a.active { background: var(--bg-elevated); color: var(--accent); }
.main-content { flex: 1; padding: 2rem 2.5rem; overflow-y: auto; }
.page-title { font-size: 2rem; margin-bottom: 2rem; }
.category-card { background: var(--bg-secondary); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.5rem; margin-bottom: 1rem; transition: border-color 0.3s; }
.category-card:hover { border-color: var(--accent); }
.category-name { font-weight: 600; font-size: 1.2rem; color: var(--text-primary); }
.category-desc { color: var(--text-secondary); margin-top: 0.4rem; }
.thread-list-header, .thread-row { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 1.5rem; padding: 0.9rem 0; border-bottom: 1px solid var(--border); align-items: center; }
.thread-list-header { font-weight: 600; color: var(--text-secondary); border-bottom: 2px solid var(--border); }
.thread-row:hover { background: var(--bg-elevated); }
.thread-title { color: var(--text-primary); }
.thread-detail { margin-bottom: 2.5rem; }
.thread-title-main { font-size: 1.8rem; margin-bottom: 0.5rem; }
.thread-meta { color: var(--text-secondary); margin-bottom: 1.5rem; }
.thread-content { background: var(--bg-secondary); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.5rem; margin-bottom: 1.5rem; }
.reply-item { background: var(--bg-secondary); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.2rem; margin-bottom: 1rem; }
.reply-header { font-weight: 500; margin-bottom: 0.5rem; color: var(--accent); }
.reply-form-container { margin-top: 2rem; display: flex; flex-direction: column; gap: 1rem; }
.profile-header { display: flex; flex-direction: column; align-items: center; gap: 1rem; }
.profile-avatar { width: 90px; height: 90px; border-radius: 50%; object-fit: cover; border: 2px solid var(--accent); }
.profile-stats { display: flex; gap: 2rem; color: var(--text-secondary); }
.badge-role { background: var(--accent); color: #000; padding: 0.2rem 0.8rem; border-radius: 12px; font-size: 0.75rem; text-transform: uppercase; font-weight: 700; }
.chat-layout { display: flex; height: calc(100vh - 60px); }
.chat-sidebar { width: 280px; background: var(--bg-secondary); border-right: 1px solid var(--border); overflow-y: auto; padding: 1rem; }
.conversation-item { padding: 0.8rem; border-radius: var(--radius); cursor: pointer; color: var(--text-secondary); margin-bottom: 0.2rem; }
.conversation-item:hover { background: var(--bg-elevated); color: var(--accent); }
.chat-main { flex: 1; display: flex; flex-direction: column; }
.chat-header { padding: 1rem 1.5rem; border-bottom: 1px solid var(--border); font-weight: 600; background: var(--bg-secondary); }
.chat-messages { flex: 1; padding: 1.5rem; overflow-y: auto; display: flex; flex-direction: column; gap: 1rem; }
.chat-empty { flex: 1; display: flex; align-items: center; justify-content: center; color: var(--text-secondary); }
.message-item { background: var(--bg-elevated); padding: 0.7rem 1rem; border-radius: var(--radius); max-width: 80%; }
.msg-sender { font-weight: 600; color: var(--accent); }
.msg-time { font-size: 0.7rem; color: var(--text-secondary); margin-left: 0.5rem; }
.chat-input-area { display: flex; gap: 0.5rem; padding: 1rem; border-top: 1px solid var(--border); background: var(--bg-secondary); }
.chat-input-area .form-input { flex: 1; }
.admin-table { width: 100%; border-collapse: collapse; margin-top: 1rem; }
.admin-table th, .admin-table td { border: 1px solid var(--border); padding: 0.7rem; text-align: left; }
.admin-table th { background: var(--bg-elevated); }
.role-select { background: var(--bg-primary); color: var(--text-primary); border: 1px solid var(--border); border-radius: 4px; padding: 0.3rem; }
@media (max-width: 768px) {
  .sidebar { display: none; }
  .main-layout { flex-direction: column; }
  .thread-list-header, .thread-row { grid-template-columns: 1fr 0.5fr 0.5fr; }
  .thread-row span:last-child { display: none; }
  .chat-sidebar { width: 100px; }
}