/* ============================================
   FLUX SIGNAL FORUM — Design System
   ============================================ */

@import url("https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap");

/* --- CSS Variables (Dark Theme Default) --- */
:root {
  --bg-primary: #0a0e1a;
  --bg-secondary: #111827;
  --bg-card: rgba(17, 24, 39, 0.85);
  --bg-card-hover: rgba(30, 41, 59, 0.95);
  --bg-glass: rgba(15, 23, 42, 0.6);
  --bg-input: rgba(30, 41, 59, 0.7);
  --border-color: rgba(56, 189, 248, 0.12);
  --border-glow: rgba(56, 189, 248, 0.3);
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent-blue: #38bdf8;
  --accent-cyan: #22d3ee;
  --accent-purple: #a78bfa;
  --accent-green: #34d399;
  --accent-orange: #fb923c;
  --accent-red: #f87171;
  --accent-pink: #f472b6;
  --gradient-primary: linear-gradient(
    135deg,
    #38bdf8 0%,
    #22d3ee 50%,
    #a78bfa 100%
  );
  --gradient-button: linear-gradient(135deg, #0ea5e9 0%, #06b6d4 100%);
  --gradient-hero: linear-gradient(
    180deg,
    rgba(56, 189, 248, 0.08) 0%,
    transparent 60%
  );
  --gradient-card: linear-gradient(
    145deg,
    rgba(56, 189, 248, 0.05) 0%,
    rgba(139, 92, 246, 0.03) 100%
  );
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 20px rgba(56, 189, 248, 0.15);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* --- Light Theme --- */
[data-theme="light"] {
  --bg-primary: #f0f4f8;
  --bg-secondary: #ffffff;
  --bg-card: rgba(255, 255, 255, 0.9);
  --bg-card-hover: rgba(241, 245, 249, 0.98);
  --bg-glass: rgba(255, 255, 255, 0.7);
  --bg-input: rgba(241, 245, 249, 0.9);
  --border-color: rgba(15, 23, 42, 0.1);
  --border-glow: rgba(14, 165, 233, 0.25);
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --accent-blue: #0284c7;
  --accent-cyan: #0891b2;
  --accent-purple: #7c3aed;
  --accent-green: #059669;
  --accent-orange: #ea580c;
  --accent-red: #dc2626;
  --accent-pink: #db2777;
  --gradient-primary: linear-gradient(
    135deg,
    #0284c7 0%,
    #0891b2 50%,
    #7c3aed 100%
  );
  --gradient-button: linear-gradient(135deg, #0284c7 0%, #0891b2 100%);
  --gradient-hero: linear-gradient(
    180deg,
    rgba(14, 165, 233, 0.06) 0%,
    transparent 60%
  );
  --gradient-card: linear-gradient(
    145deg,
    rgba(14, 165, 233, 0.04) 0%,
    rgba(124, 58, 237, 0.02) 100%
  );
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.1);
  --shadow-glow: 0 0 20px rgba(14, 165, 233, 0.1);
}

/* --- Reset & Base --- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  overflow-x: hidden;
}

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  transition: background 0.4s ease, color 0.4s ease;
  overflow-x: hidden;
  width: 100%;
  max-width: 100vw;
}

a {
  color: var(--accent-blue);
  text-decoration: none;
  transition: var(--transition);
}
a:hover {
  color: var(--accent-cyan);
}

img {
  max-width: 100%;
  display: block;
}

/* --- Utilities --- */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
}
.flex {
  display: flex;
}
.flex-col {
  flex-direction: column;
}
.items-center {
  align-items: center;
}
.justify-between {
  justify-content: space-between;
}
.gap-4 {
  gap: 16px;
}
.gap-6 {
  gap: 24px;
}
.gap-8 {
  gap: 32px;
}
.text-center {
  text-align: center;
}
.text-gradient {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* --- Header --- */
.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  padding: 0 0;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  max-width: 1400px;
  width: 100%;
  margin: 0 auto;
  box-sizing: border-box;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: -0.5px;
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: var(--gradient-button);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  color: #fff;
  box-shadow: 0 0 15px rgba(56, 189, 248, 0.3);
}

.logo span:first-of-type {
  color: var(--text-primary);
}
.logo span:last-of-type {
  color: var(--accent-blue);
}

.nav {
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav a {
  color: var(--text-secondary);
  font-size: 0.88rem;
  font-weight: 500;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  white-space: nowrap;
}

.nav a:hover,
.nav a.active {
  color: var(--accent-blue);
  background: rgba(56, 189, 248, 0.08);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  font-family: inherit;
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient-button);
  color: #fff;
  box-shadow: 0 4px 15px rgba(14, 165, 233, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 25px rgba(14, 165, 233, 0.45);
}

.btn-secondary {
  background: var(--bg-input);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  border-color: var(--accent-blue);
  background: rgba(56, 189, 248, 0.08);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  padding: 8px 12px;
}

.btn-ghost:hover {
  color: var(--accent-blue);
  background: rgba(56, 189, 248, 0.08);
}

.btn-sm {
  padding: 6px 14px;
  font-size: 0.8rem;
}
.btn-lg {
  padding: 14px 32px;
  font-size: 1rem;
}
.btn-icon {
  width: 40px;
  height: 40px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 1.1rem;
  transition: var(--transition);
  position: relative;
}

.btn-icon:hover {
  color: var(--accent-blue);
  border-color: var(--accent-blue);
}

.btn-icon .badge-dot {
  position: absolute;
  top: 6px;
  right: 6px;
  width: 8px;
  height: 8px;
  background: var(--accent-red);
  border-radius: 50%;
  border: 2px solid var(--bg-secondary);
}

/* Dropdowns */
.dropdown {
  position: relative;
}

.dropdown-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  width: 320px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: 8px;
  display: none;
  z-index: 100;
  backdrop-filter: blur(20px);
}

.dropdown-menu.active {
  display: block;
  animation: fadeIn 0.2s ease;
}

.dropdown-menu.sm {
  width: 160px;
}

.dropdown-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
  font-size: 0.85rem;
  color: var(--text-primary);
}

.dropdown-item:hover {
  background: rgba(56, 189, 248, 0.08);
}

.dropdown-item img {
  width: 36px;
  height: 36px;
  border-radius: 50%;
}

.dropdown-header {
  padding: 10px 12px 8px;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
}

/* Language Switcher */
.lang-switch {
  display: flex;
  align-items: center;
  gap: 2px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 3px;
}

.lang-switch .btn-lang {
  padding: 5px 10px;
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 6px;
  cursor: pointer;
  transition: var(--transition);
  font-family: inherit;
}

.lang-switch .btn-lang.active {
  background: var(--gradient-button);
  color: #fff;
}

/* Theme Toggle */
.theme-toggle {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
  transition: var(--transition);
}

.theme-toggle:hover {
  color: var(--accent-orange);
  border-color: var(--accent-orange);
}

/* Mobile Menu */
.mobile-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border: 1px solid var(--border-color);
  background: var(--bg-input);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 1.2rem;
  cursor: pointer;
  align-items: center;
  justify-content: center;
}

/* --- Hero Section --- */
.hero {
  padding: 80px 20px 60px;
  text-align: center;
  background: var(--gradient-hero);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: -200px;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(
    circle,
    rgba(56, 189, 248, 0.08) 0%,
    transparent 70%
  );
  pointer-events: none;
}

.hero h1 {
  font-size: 3rem;
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 16px;
  letter-spacing: -1px;
}

.hero .subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 32px;
  line-height: 1.7;
}

.hero-buttons {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.hero-stats {
  display: flex;
  gap: 48px;
  justify-content: center;
  flex-wrap: wrap;
}

.hero-stat {
  text-align: center;
}

.hero-stat .number {
  font-size: 2rem;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-stat .label {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* --- Main Layout --- */
.main-layout {
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: 28px;
  max-width: 1400px;
  width: 100%;
  margin: 0 auto;
  padding: 32px 20px;
  box-sizing: border-box;
}

/* Prevent any child from blowing out the grid */
.main-layout > * {
  min-width: 0;
  max-width: 100%;
}

/* --- Cards --- */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: var(--transition);
  backdrop-filter: blur(10px);
  background-image: var(--gradient-card);
}

.card:hover {
  border-color: var(--border-glow);
  box-shadow: var(--shadow-glow);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-color);
}

.card-title {
  font-size: 1.05rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 10px;
}

.card-title .emoji {
  font-size: 1.2rem;
}

/* --- Forum Categories --- */
.categories-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-bottom: 32px;
}

.category-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px;
  display: flex;
  align-items: flex-start;
  gap: 16px;
  cursor: pointer;
  transition: var(--transition);
  backdrop-filter: blur(10px);
}

.category-card:hover {
  border-color: var(--border-glow);
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
}

.category-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  flex-shrink: 0;
}

.category-icon.blue {
  background: rgba(56, 189, 248, 0.12);
}
.category-icon.green {
  background: rgba(52, 211, 153, 0.12);
}
.category-icon.purple {
  background: rgba(167, 139, 250, 0.12);
}
.category-icon.orange {
  background: rgba(251, 146, 60, 0.12);
}
.category-icon.red {
  background: rgba(248, 113, 113, 0.12);
}
.category-icon.cyan {
  background: rgba(34, 211, 238, 0.12);
}
.category-icon.pink {
  background: rgba(244, 114, 182, 0.12);
}
.category-icon.yellow {
  background: rgba(250, 204, 21, 0.12);
}

.category-info h3 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.category-info p {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.category-meta {
  display: flex;
  gap: 16px;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.category-meta span {
  display: flex;
  align-items: center;
  gap: 4px;
}

/* --- Thread List --- */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.section-title {
  font-size: 1.2rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  gap: 10px;
}

.thread-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.thread-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 18px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: var(--transition);
}

.thread-item:hover {
  border-color: var(--border-glow);
  background: var(--bg-card-hover);
  transform: translateX(4px);
}

.thread-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  flex-shrink: 0;
  border: 2px solid var(--border-color);
}

.thread-content {
  flex: 1;
  min-width: 0;
}

.thread-title {
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--text-primary);
}

.thread-title a {
  color: inherit;
}
.thread-title a:hover {
  color: var(--accent-blue);
}

.thread-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.thread-meta .author {
  color: var(--accent-blue);
  font-weight: 500;
}

.thread-stats {
  display: flex;
  gap: 16px;
  flex-shrink: 0;
}

.thread-stat {
  text-align: center;
  min-width: 50px;
}

.thread-stat .num {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text-primary);
}

.thread-stat .label {
  font-size: 0.68rem;
  color: var(--text-muted);
}

.thread-last-activity {
  text-align: right;
  flex-shrink: 0;
  min-width: 90px;
}

.thread-last-activity .time {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.thread-last-activity .user {
  font-size: 0.72rem;
  color: var(--accent-blue);
}

/* Category Tab Section */
.category-tabs-wrapper {
  max-width: 100%;
  overflow: hidden;
}
.category-tabs {
  display: flex;
  gap: 4px;
  padding: 4px;
  background: var(--bg-input);
  border-radius: var(--radius-sm);
  margin-bottom: 20px;
  overflow-x: auto;
  flex-wrap: nowrap;
  scrollbar-width: none;
  -ms-overflow-style: none;
}
.category-tabs::-webkit-scrollbar {
  display: none;
}

.category-tab {
  padding: 8px 16px;
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-size: 0.8rem;
  font-weight: 600;
  border-radius: 6px;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
  font-family: inherit;
}

.category-tab.active {
  background: var(--gradient-button);
  color: #fff;
}

.category-tab:hover:not(.active) {
  color: var(--text-primary);
}

/* Badge Tags */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.badge-pro {
  background: rgba(56, 189, 248, 0.12);
  color: var(--accent-blue);
}
.badge-verified {
  background: rgba(52, 211, 153, 0.12);
  color: var(--accent-green);
}
.badge-newbie {
  background: rgba(167, 139, 250, 0.12);
  color: var(--accent-purple);
}
.badge-hot {
  background: rgba(248, 113, 113, 0.12);
  color: var(--accent-red);
}
.badge-pinned {
  background: rgba(250, 204, 21, 0.12);
  color: #facc15;
}

/* --- Sidebar --- */
.sidebar {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.sidebar-widget {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 20px;
  transition: var(--transition);
  backdrop-filter: blur(10px);
}

.sidebar-widget:hover {
  border-color: var(--border-glow);
}

.widget-title {
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-color);
}

.widget-title .emoji {
  font-size: 1.1rem;
}

/* Trending Topics */
.trending-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.03);
}

.trending-item:last-child {
  border-bottom: none;
}

.trending-num {
  font-size: 0.8rem;
  font-weight: 800;
  color: var(--accent-blue);
  width: 24px;
}

.trending-title {
  font-size: 0.82rem;
  font-weight: 500;
  flex: 1;
  color: var(--text-primary);
}

.trending-title:hover {
  color: var(--accent-blue);
  cursor: pointer;
}

.trending-count {
  font-size: 0.72rem;
  color: var(--text-muted);
}

/* Top Traders */
.trader-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.03);
}

.trader-item:last-child {
  border-bottom: none;
}

.trader-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
}

.trader-info {
  flex: 1;
}

.trader-name {
  font-size: 0.82rem;
  font-weight: 600;
}

.trader-bio {
  font-size: 0.72rem;
  color: var(--text-muted);
}

.trader-stats {
  font-size: 0.72rem;
  color: var(--accent-green);
  font-weight: 700;
}

/* Video Widget */
.video-wrapper {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  padding-bottom: 56.25%;
  margin-bottom: 12px;
}

.video-wrapper iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
}

/* CTA Widget */
.cta-widget {
  background: var(--gradient-button) !important;
  border: none !important;
  text-align: center;
  color: #fff;
}

.cta-widget .widget-title {
  border-bottom-color: rgba(255, 255, 255, 0.2);
  color: #fff;
}
.cta-widget p {
  font-size: 0.85rem;
  margin-bottom: 16px;
  opacity: 0.9;
}

.cta-widget .btn {
  background: rgba(255, 255, 255, 0.2);
  color: #fff;
  width: 100%;
  justify-content: center;
  backdrop-filter: blur(10px);
}

.cta-widget .btn:hover {
  background: rgba(255, 255, 255, 0.3);
}

/* Online Widget */
.online-indicator {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: rgba(52, 211, 153, 0.08);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
}

.online-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent-green);
  box-shadow: 0 0 10px rgba(52, 211, 153, 0.5);
  animation: pulse 2s ease-in-out infinite;
}

/* Tip Widget */
.tip-content {
  background: rgba(56, 189, 248, 0.06);
  border-radius: var(--radius-sm);
  padding: 16px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
  border-left: 3px solid var(--accent-blue);
}

/* Facebook Widget */
.facebook-widget {
  background: linear-gradient(
    135deg,
    rgba(24, 119, 242, 0.1) 0%,
    rgba(24, 119, 242, 0.03) 100%
  ) !important;
}

.facebook-widget .btn {
  background: #1877f2;
  color: #fff;
  width: 100%;
  justify-content: center;
}

.facebook-widget .btn:hover {
  background: #166fe0;
  transform: translateY(-2px);
}

/* --- Thread Page --- */
.thread-page-header {
  padding: 24px 0;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 24px;
}

.thread-page-title {
  font-size: 1.6rem;
  font-weight: 800;
  margin-bottom: 12px;
  line-height: 1.3;
}

.thread-page-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.post {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 16px;
  transition: var(--transition);
}

.post:hover {
  border-color: var(--border-glow);
}

.post.op {
  border-left: 3px solid var(--accent-blue);
}

.post-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
}

.post-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 2px solid var(--border-color);
}

.post-author-info {
  flex: 1;
}

.post-author {
  font-size: 0.9rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
}

.post-time {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.post-body {
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.post-body p {
  margin-bottom: 12px;
}
.post-body blockquote {
  border-left: 3px solid var(--accent-blue);
  padding: 12px 16px;
  margin: 12px 0;
  background: rgba(56, 189, 248, 0.05);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-muted);
  font-style: italic;
}

.post-actions {
  display: flex;
  gap: 8px;
  padding-top: 12px;
  border-top: 1px solid var(--border-color);
}

.post-action {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  font-size: 0.78rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  font-family: inherit;
}

.post-action:hover {
  border-color: var(--accent-blue);
  color: var(--accent-blue);
}

/* --- Guides / Articles --- */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  cursor: pointer;
  transition: var(--transition);
}

.article-card:hover {
  border-color: var(--border-glow);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

.article-thumb {
  height: 160px;
  background: var(--gradient-card);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  position: relative;
  overflow: hidden;
}

.article-thumb::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(56, 189, 248, 0.1) 0%,
    rgba(139, 92, 246, 0.1) 100%
  );
}

.article-body {
  padding: 20px;
}

.article-tag {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--accent-blue);
  margin-bottom: 8px;
}

.article-title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 8px;
  line-height: 1.4;
}

.article-desc {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 12px;
  line-height: 1.5;
}

.article-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.article-author {
  display: flex;
  align-items: center;
  gap: 8px;
}

.article-author img {
  width: 24px;
  height: 24px;
  border-radius: 50%;
}

/* --- Leaderboard --- */
.leaderboard-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  border-bottom: 1px solid rgba(255, 255, 255, 0.03);
}

.leaderboard-item:hover {
  background: rgba(56, 189, 248, 0.05);
}

.leaderboard-rank {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 800;
  flex-shrink: 0;
}

.leaderboard-rank.gold {
  background: rgba(250, 204, 21, 0.15);
  color: #facc15;
}
.leaderboard-rank.silver {
  background: rgba(148, 163, 184, 0.15);
  color: #94a3b8;
}
.leaderboard-rank.bronze {
  background: rgba(251, 146, 60, 0.15);
  color: #fb923c;
}
.leaderboard-rank.normal {
  background: var(--bg-input);
  color: var(--text-muted);
}

.leaderboard-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
}

.leaderboard-info {
  flex: 1;
}
.leaderboard-name {
  font-size: 0.82rem;
  font-weight: 600;
}
.leaderboard-score {
  font-size: 0.72rem;
  color: var(--text-muted);
}
.leaderboard-points {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--accent-blue);
}

/* --- Banners --- */
.banner {
  background: var(--gradient-button);
  border-radius: var(--radius-lg);
  padding: 28px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: #fff;
  margin: 32px 0;
  position: relative;
  overflow: hidden;
}

.banner::before {
  content: "";
  position: absolute;
  right: -50px;
  top: -50px;
  width: 200px;
  height: 200px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 50%;
}

.banner-content h3 {
  font-size: 1.2rem;
  font-weight: 800;
  margin-bottom: 6px;
}
.banner-content p {
  font-size: 0.88rem;
  opacity: 0.85;
}

.banner .btn {
  background: rgba(255, 255, 255, 0.2);
  color: #fff;
  backdrop-filter: blur(10px);
}

.banner .btn:hover {
  background: rgba(255, 255, 255, 0.35);
}

/* --- Footer --- */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 48px 20px 24px;
  margin-top: 48px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  max-width: 1400px;
  margin: 0 auto 32px;
}

.footer-brand .logo {
  margin-bottom: 12px;
}
.footer-brand p {
  font-size: 0.85rem;
  color: var(--text-muted);
  max-width: 300px;
  line-height: 1.6;
}

.footer-col h4 {
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.footer-col a {
  display: block;
  font-size: 0.82rem;
  color: var(--text-muted);
  padding: 4px 0;
}

.footer-col a:hover {
  color: var(--accent-blue);
}

.footer-bottom {
  text-align: center;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
  font-size: 0.78rem;
  color: var(--text-muted);
  max-width: 1400px;
  margin: 0 auto;
}

/* --- Reply Box --- */
.reply-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-top: 24px;
}

.reply-box h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.reply-textarea {
  width: 100%;
  min-height: 120px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px;
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.88rem;
  resize: vertical;
  transition: var(--transition);
}

.reply-textarea:focus {
  outline: none;
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.1);
}

.reply-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 12px;
}

/* --- Breadcrumb --- */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  color: var(--text-muted);
  padding: 16px 0;
}

.breadcrumb a {
  color: var(--text-muted);
}
.breadcrumb a:hover {
  color: var(--accent-blue);
}
.breadcrumb .sep {
  opacity: 0.4;
}

/* Pages header for guides */
.page-hero {
  padding: 48px 20px 32px;
  text-align: center;
  background: var(--gradient-hero);
}

.page-hero h1 {
  font-size: 2.2rem;
  font-weight: 900;
  margin-bottom: 10px;
}
.page-hero p {
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 500px;
  margin: 0 auto;
}

/* --- Search --- */
.search-box {
  position: relative;
  margin-bottom: 20px;
}

.search-input {
  width: 100%;
  padding: 12px 16px 12px 44px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.88rem;
  font-family: inherit;
  transition: var(--transition);
}

.search-input:focus {
  outline: none;
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.1);
}

.search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* --- Pagination --- */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  margin-top: 24px;
}

.page-btn {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-secondary);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  font-family: inherit;
}

.page-btn:hover {
  border-color: var(--accent-blue);
  color: var(--accent-blue);
}
.page-btn.active {
  background: var(--gradient-button);
  color: #fff;
  border-color: transparent;
}

/* --- Animations --- */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulse {
  0%,
  100% {
    transform: scale(1);
    opacity: 1;
  }
  50% {
    transform: scale(1.3);
    opacity: 0.7;
  }
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.fade-in {
  animation: fadeIn 0.5s ease forwards;
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .main-layout {
    grid-template-columns: 1fr;
  }
  .sidebar {
    order: 2;
  }
  .categories-grid {
    grid-template-columns: 1fr;
  }
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 24px;
  }
  .nav {
    display: none;
  }
  .mobile-toggle {
    display: flex;
  }
}

@media (max-width: 768px) {
  .hero h1 {
    font-size: 2rem;
  }
  .hero {
    padding: 40px 16px 32px;
  }
  .hero-stats {
    gap: 24px;
  }
  .hero-stat .number {
    font-size: 1.5rem;
  }
  .thread-stats,
  .thread-last-activity {
    display: none;
  }
  .articles-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .banner {
    flex-direction: column;
    text-align: center;
    gap: 16px;
  }
  .header-actions .btn-primary {
    display: none;
  }
  .thread-page-title {
    font-size: 1.2rem;
  }
  .lang-switch {
    display: none;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 1.6rem;
  }
  .hero-buttons {
    flex-direction: column;
  }
  .hero-buttons .btn {
    width: 100%;
    justify-content: center;
  }
  .post-header {
    flex-wrap: wrap;
  }
  .header-inner {
    padding: 10px 12px;
  }
}

/* Mobile Nav */
.mobile-nav {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--bg-primary);
  z-index: 2000;
  padding: 20px;
  flex-direction: column;
}

.mobile-nav.active {
  display: flex;
  animation: fadeIn 0.25s ease;
}

.mobile-nav-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 32px;
}

.mobile-nav-close {
  width: 40px;
  height: 40px;
  border: 1px solid var(--border-color);
  background: var(--bg-input);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 1.2rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.mobile-nav a {
  display: block;
  padding: 14px 0;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border-color);
}

.mobile-nav a:hover {
  color: var(--accent-blue);
}

/* Notification item style */
.notif-text {
  flex: 1;
}
.notif-text p {
  font-size: 0.82rem;
  line-height: 1.4;
}
.notif-text .notif-time {
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-top: 2px;
}

/* Section */
.forum-section {
  margin-bottom: 32px;
}

/* Articles sidebar list */
.sidebar-article-item {
  display: flex;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.03);
}

.sidebar-article-item:last-child {
  border-bottom: none;
}

.sidebar-article-title {
  font-size: 0.82rem;
  font-weight: 500;
  flex: 1;
  color: var(--text-primary);
  cursor: pointer;
}

.sidebar-article-title:hover {
  color: var(--accent-blue);
}

.sidebar-article-time {
  font-size: 0.7rem;
  color: var(--text-muted);
  white-space: nowrap;
}

/* ============================================
   AUTH MODALS (Login / Register)
   ============================================ */
.auth-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 9999;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.auth-overlay.active {
  display: flex;
  animation: fadeIn 0.25s ease;
}

.auth-modal {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  width: 100%;
  max-width: 460px;
  max-height: 90vh;
  overflow-y: auto;
  padding: 36px;
  position: relative;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5), 0 0 40px rgba(56, 189, 248, 0.1);
  animation: slideUp 0.3s ease;
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.auth-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 1.3rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.auth-close:hover {
  color: var(--accent-red);
  border-color: var(--accent-red);
}

.auth-header {
  text-align: center;
  margin-bottom: 28px;
}

.auth-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 1.3rem;
  font-weight: 800;
  margin-bottom: 16px;
}

.auth-logo span:first-of-type {
  color: var(--text-primary);
}
.auth-logo span:last-of-type {
  color: var(--accent-blue);
}

.auth-header h2 {
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 6px;
}

.auth-header p {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.auth-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.auth-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.auth-field label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.auth-field input {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background: var(--bg-input);
  color: var(--text-primary);
  font-size: 0.9rem;
  font-family: inherit;
  transition: var(--transition);
  outline: none;
}

.auth-field input:focus {
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.15);
}

.auth-field input::placeholder {
  color: var(--text-muted);
}

.auth-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.auth-options {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.82rem;
}

.auth-options a {
  color: var(--accent-blue);
  font-weight: 500;
}

.auth-check {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  color: var(--text-secondary);
  cursor: pointer;
}

.auth-check input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--accent-blue);
  cursor: pointer;
}

.auth-divider {
  display: flex;
  align-items: center;
  gap: 16px;
  color: var(--text-muted);
  font-size: 0.78rem;
}

.auth-divider::before,
.auth-divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--border-color);
}

.auth-social {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.auth-social-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 11px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background: var(--bg-input);
  color: var(--text-primary);
  font-size: 0.85rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: var(--transition);
}

.auth-social-btn:hover {
  border-color: var(--accent-blue);
  background: rgba(56, 189, 248, 0.06);
}

.auth-switch {
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.auth-switch a {
  color: var(--accent-blue);
  font-weight: 600;
}

/* Header auth buttons */
.header-auth-btns {
  display: flex;
  gap: 6px;
  align-items: center;
}

.btn-login {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  transition: var(--transition);
}

.btn-login:hover {
  color: var(--accent-blue);
  border-color: var(--accent-blue);
}

@media (max-width: 768px) {
  .auth-modal {
    padding: 24px;
    margin: 10px;
  }
  .auth-row {
    grid-template-columns: 1fr;
  }
  .auth-social {
    grid-template-columns: 1fr;
  }
}