/* ===========================
   CSS Variables & Themes
   =========================== */
:root {
  --primary: #3b82f6;
  --primary-hover: #2563eb;
  --primary-light: rgba(59, 130, 246, 0.15);
  --success: #22c55e;
  --warning: #f59e0b;
  --navbar-height: 60px;
  --sidebar-width: 272px;
  --sidebar-collapsed: 72px;
  --radius: 10px;
  --radius-sm: 6px;
  --transition: 0.2s ease;
  --card-shadow: 0 2px 8px rgba(0,0,0,0.25);
  --card-shadow-hover: 0 6px 20px rgba(0,0,0,0.4);
}

[data-theme="dark"] {
  --bg: #0f1117;
  --bg2: #161b27;
  --bg3: #1e2535;
  --bg4: #252d3d;
  --border: #2a3347;
  --text: #e8eaf0;
  --text-muted: #8892a4;
  --text-faint: #4d5875;
  --card-bg: #161b27;
  --sidebar-bg: #0d1120;
  --header-bg: rgba(13,17,32,0.95);
  --input-bg: #1e2535;
  --badge-bg: #252d3d;
}

[data-theme="light"] {
  --bg: #f0f2f7;
  --bg2: #ffffff;
  --bg3: #f5f6fa;
  --bg4: #eef0f6;
  --border: #dde1ec;
  --text: #1a1f2e;
  --text-muted: #6b7280;
  --text-faint: #9ca3af;
  --card-bg: #ffffff;
  --sidebar-bg: #ffffff;
  --header-bg: rgba(255,255,255,0.95);
  --input-bg: #f5f6fa;
  --badge-bg: #eef0f6;
}

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

html {
  font-size: 15px;
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Inter', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  transition: background 0.3s, color 0.3s;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

ul {
  list-style: none;
}

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

/* ===========================
   NProgress Bar
   =========================== */
#nprogress {
  pointer-events: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 9999;
  height: 3px;
  background: var(--primary);
  box-shadow: 0 0 8px var(--primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s ease;
}
#nprogress.loading {
  animation: nprogress 1.5s ease forwards;
}
@keyframes nprogress {
  0% { transform: scaleX(0); }
  60% { transform: scaleX(0.7); }
  100% { transform: scaleX(1); }
}

/* ===========================
   Header / Navbar
   =========================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--navbar-height);
  background: var(--header-bg);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 1rem;
  gap: 0.75rem;
  z-index: 100;
  transition: background 0.3s;
}

.header-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--primary);
  white-space: nowrap;
  min-width: 52px;
}

.header-logo .logo-icon {
  width: 34px;
  height: 34px;
  background: var(--primary);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1rem;
  font-weight: 900;
  flex-shrink: 0;
}

.header-logo .logo-text {
  transition: opacity 0.2s, width 0.2s;
  overflow: hidden;
}

.sidebar-toggle {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  transition: background var(--transition), color var(--transition);
  flex-shrink: 0;
}

.sidebar-toggle:hover {
  background: var(--bg3);
  color: var(--text);
}

.header-search {
  flex: 1;
  max-width: 420px;
  position: relative;
}

.header-search input {
  width: 100%;
  height: 38px;
  background: var(--input-bg);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 0 1rem 0 2.5rem;
  font-size: 0.875rem;
  color: var(--text);
  outline: none;
  transition: border-color var(--transition), background var(--transition);
}

.header-search input::placeholder {
  color: var(--text-faint);
}

.header-search input:focus {
  border-color: var(--primary);
  background: var(--bg2);
}

.header-search .search-icon {
  position: absolute;
  left: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-faint);
  pointer-events: none;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-left: auto;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 0.9rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  transition: background var(--transition), color var(--transition), transform 0.1s;
  white-space: nowrap;
}

.btn:active {
  transform: scale(0.97);
}

.btn-ghost {
  color: var(--text-muted);
  background: transparent;
}

.btn-ghost:hover {
  background: var(--bg3);
  color: var(--text);
}

.btn-primary {
  background: var(--primary);
  color: white;
}

.btn-primary:hover {
  background: var(--primary-hover);
}

.btn-outline {
  border: 1px solid var(--border);
  color: var(--text-muted);
  background: transparent;
}

.btn-outline:hover {
  background: var(--bg3);
  color: var(--text);
  border-color: var(--text-faint);
}

.icon-btn {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  transition: background var(--transition), color var(--transition);
}

.icon-btn:hover {
  background: var(--bg3);
  color: var(--text);
}

.discord-btn {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  font-weight: 600;
  background: #5865f2;
  color: white;
  transition: background var(--transition), transform 0.1s;
}

.discord-btn:hover {
  background: #4752c4;
}

.discord-btn:active {
  transform: scale(0.97);
}

/* ===========================
   Layout
   =========================== */
.layout {
  display: flex;
  padding-top: var(--navbar-height);
  min-height: 100vh;
}

/* ===========================
   Sidebar
   =========================== */
.sidebar {
  position: fixed;
  top: var(--navbar-height);
  left: 0;
  bottom: 0;
  width: var(--sidebar-width);
  background: var(--sidebar-bg);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  overflow-x: hidden;
  transition: width 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 50;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

.sidebar::-webkit-scrollbar {
  width: 4px;
}

.sidebar::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 4px;
}

.sidebar.collapsed {
  width: var(--sidebar-collapsed);
}

.sidebar-nav {
  padding: 0.75rem 0.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.55rem 0.75rem;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
  white-space: nowrap;
  overflow: hidden;
}

.nav-item:hover {
  background: var(--bg3);
  color: var(--text);
}

.nav-item.active {
  background: var(--primary-light);
  color: var(--primary);
}

.nav-item .nav-icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
}

.nav-item .nav-label {
  transition: opacity 0.2s;
  flex: 1;
}

.sidebar.collapsed .nav-label {
  opacity: 0;
  pointer-events: none;
  width: 0;
}

.nav-section {
  margin-top: 0.5rem;
}

.nav-section-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.4rem 0.75rem;
  color: var(--text-faint);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
  white-space: nowrap;
  overflow: hidden;
}

.nav-section-header:hover {
  color: var(--text-muted);
}

.nav-section-header .section-icon {
  flex-shrink: 0;
  width: 20px;
  text-align: center;
}

.nav-section-header .section-label {
  flex: 1;
  transition: opacity 0.2s;
}

.nav-section-header .chevron {
  transition: transform 0.2s;
  margin-left: auto;
}

.nav-section-header.collapsed-section .chevron {
  transform: rotate(-90deg);
}

.sidebar.collapsed .section-label,
.sidebar.collapsed .chevron {
  opacity: 0;
  pointer-events: none;
}

.nav-section-items {
  overflow: hidden;
  transition: max-height 0.25s ease;
}

.nav-section-items.hidden {
  max-height: 0 !important;
}

.nav-divider {
  height: 1px;
  background: var(--border);
  margin: 0.5rem 0.75rem;
}

/* ===========================
   Main Content
   =========================== */
.main {
  flex: 1;
  margin-left: var(--sidebar-width);
  transition: margin-left 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  min-height: calc(100vh - var(--navbar-height));
  display: flex;
  flex-direction: column;
}

.main.sidebar-collapsed {
  margin-left: var(--sidebar-collapsed);
}

.content {
  flex: 1;
  padding: 1.5rem;
  max-width: 1400px;
  width: 100%;
  margin: 0 auto;
}

/* ===========================
   Page Sections
   =========================== */
.page {
  display: none;
}

.page.active {
  display: block;
  animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ===========================
   Browse Page (Home)
   =========================== */
.browse-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.browse-title {
  font-size: 1.4rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.browse-filters {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.filter-tabs {
  display: flex;
  background: var(--bg3);
  border-radius: var(--radius-sm);
  padding: 3px;
  gap: 2px;
}

.filter-tab {
  padding: 0.35rem 0.8rem;
  border-radius: calc(var(--radius-sm) - 2px);
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: background var(--transition), color var(--transition);
}

.filter-tab:hover {
  color: var(--text);
}

.filter-tab.active {
  background: var(--bg2);
  color: var(--text);
  box-shadow: 0 1px 4px rgba(0,0,0,0.15);
}

.type-filters {
  display: flex;
  gap: 0.4rem;
}

.type-badge {
  padding: 0.3rem 0.65rem;
  border-radius: 20px;
  font-size: 0.78rem;
  font-weight: 500;
  border: 1px solid var(--border);
  color: var(--text-muted);
  background: transparent;
  transition: all var(--transition);
}

.type-badge:hover {
  background: var(--bg3);
  color: var(--text);
}

.type-badge.active {
  background: var(--primary);
  border-color: var(--primary);
  color: white;
}

.type-badge.type-image { --dot: #22c55e; }
.type-badge.type-video { --dot: #ef4444; }
.type-badge.type-text  { --dot: #f59e0b; }
.type-badge.type-all   { --dot: var(--primary); }

.type-badge .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--dot);
  display: inline-block;
  margin-right: 4px;
}

.lang-select {
  height: 32px;
  padding: 0 0.6rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--input-bg);
  color: var(--text);
  font-size: 0.82rem;
  outline: none;
  cursor: pointer;
}

/* ===========================
   Quiz Grid
   =========================== */
.quiz-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}

@media (max-width: 1300px) {
  .quiz-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 900px) {
  .quiz-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 550px) {
  .quiz-grid { grid-template-columns: 1fr; }
}

/* ===========================
   Quiz Card
   =========================== */
.quiz-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  overflow: hidden;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
  box-shadow: var(--card-shadow);
  position: relative;
}

.quiz-card:hover {
  transform: translateY(-3px) scale(1.015);
  box-shadow: var(--card-shadow-hover);
  border-color: var(--primary);
}

.quiz-card-thumb {
  position: relative;
  width: 100%;
  padding-top: 56.25%; /* 16:9 */
  overflow: hidden;
  background: var(--bg4);
}

.quiz-card-thumb img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.35s ease;
}

.quiz-card:hover .quiz-card-thumb img {
  transform: scale(1.06);
}

.quiz-card-type-badge {
  position: absolute;
  top: 0.5rem;
  left: 0.5rem;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  backdrop-filter: blur(6px);
}

.quiz-card-type-badge.video {
  background: rgba(239, 68, 68, 0.9);
  color: white;
}

.quiz-card-type-badge.image {
  background: rgba(34, 197, 94, 0.9);
  color: white;
}

.quiz-card-type-badge.text {
  background: rgba(245, 158, 11, 0.9);
  color: white;
}

.quiz-card-play-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.85);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(0,0,0,0.65);
  border: 2px solid rgba(255,255,255,0.75);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  opacity: 0;
  transition: opacity 0.2s, transform 0.2s;
  backdrop-filter: blur(4px);
}

.quiz-card:hover .quiz-card-play-btn {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
}

.quiz-card-count-badge {
  position: absolute;
  bottom: 0.5rem;
  right: 0.5rem;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  font-size: 0.72rem;
  font-weight: 600;
  background: rgba(0,0,0,0.7);
  color: white;
  backdrop-filter: blur(4px);
}

.quiz-card-body {
  padding: 0.75rem;
}

.quiz-card-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.4;
  margin-bottom: 0.4rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.quiz-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.5rem;
}

.quiz-card-creator {
  font-size: 0.78rem;
  color: var(--primary);
  font-weight: 500;
}

.quiz-card-creator:hover {
  text-decoration: underline;
}

.quiz-card-time {
  font-size: 0.75rem;
  color: var(--text-faint);
}

.quiz-card-stats {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.quiz-card-stat {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.quiz-card-stat svg {
  width: 13px;
  height: 13px;
  opacity: 0.7;
}

.quiz-card-stat.trending {
  color: #ef4444;
}

.quiz-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
}

.quiz-tag {
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
  font-size: 0.7rem;
  font-weight: 500;
  background: var(--badge-bg);
  color: var(--text-muted);
  border: 1px solid var(--border);
  transition: background var(--transition), color var(--transition);
}

.quiz-tag:hover {
  background: var(--primary-light);
  color: var(--primary);
  border-color: var(--primary);
}

.quiz-card-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 0.6rem;
  padding-top: 0.6rem;
  border-top: 1px solid var(--border);
}

.quiz-card-action-btn {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.78rem;
  color: var(--text-muted);
  padding: 0.3rem 0.5rem;
  border-radius: var(--radius-sm);
  transition: background var(--transition), color var(--transition);
}

.quiz-card-action-btn:hover {
  background: var(--bg3);
  color: var(--text);
}

.quiz-card-action-btn.liked {
  color: #ef4444;
}

.quiz-card-action-btn svg {
  width: 14px;
  height: 14px;
}

/* ===========================
   Load More
   =========================== */
.load-more-container {
  display: flex;
  justify-content: center;
  margin-top: 2rem;
  margin-bottom: 1rem;
}

.btn-load-more {
  padding: 0.65rem 2rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
  background: var(--bg2);
  transition: all var(--transition);
}

.btn-load-more:hover {
  background: var(--primary);
  border-color: var(--primary);
  color: white;
}

/* ===========================
   Quiz Play Page
   =========================== */
.quiz-play-container {
  max-width: 860px;
  margin: 0 auto;
  padding: 1rem 0;
}

.quiz-play-header {
  margin-bottom: 1.5rem;
}

.quiz-breadcrumb {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.quiz-breadcrumb a {
  color: var(--primary);
}

.quiz-breadcrumb a:hover {
  text-decoration: underline;
}

.quiz-play-title {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.quiz-play-info {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

.quiz-play-info .creator {
  color: var(--primary);
  font-weight: 500;
}

.quiz-play-info .creator:hover {
  text-decoration: underline;
}

.quiz-play-actions {
  display: flex;
  gap: 0.5rem;
  margin-top: 1rem;
  flex-wrap: wrap;
}

.quiz-stage {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.quiz-stage-lobby {
  padding: 2rem;
  text-align: center;
}

.quiz-lobby-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.quiz-lobby-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.quiz-lobby-desc {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  max-width: 400px;
  margin: 0 auto 1.5rem;
  text-align: left;
}

.quiz-option-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.875rem;
}

.quiz-option-row label {
  color: var(--text-muted);
}

.quiz-option-row select {
  padding: 0.35rem 0.6rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--input-bg);
  color: var(--text);
  font-size: 0.85rem;
  outline: none;
}

.quiz-start-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 2.5rem;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 600;
  background: var(--primary);
  color: white;
  transition: background var(--transition), transform 0.1s;
}

.quiz-start-btn:hover {
  background: var(--primary-hover);
}

.quiz-start-btn:active {
  transform: scale(0.97);
}

/* Quiz active */
.quiz-active {
  padding: 1.5rem;
}

.quiz-progress-bar-wrap {
  background: var(--bg4);
  border-radius: 4px;
  height: 6px;
  margin-bottom: 1.25rem;
  overflow: hidden;
}

.quiz-progress-bar {
  height: 100%;
  background: var(--primary);
  border-radius: 4px;
  transition: width 0.4s ease;
}

.quiz-question-num {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.quiz-question-text {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
  line-height: 1.5;
}

.quiz-question-media {
  width: 100%;
  max-height: 320px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  margin-bottom: 1.25rem;
}

.quiz-answers {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.65rem;
}

@media (max-width: 500px) {
  .quiz-answers { grid-template-columns: 1fr; }
}

.quiz-answer-btn {
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  border: 2px solid var(--border);
  background: var(--bg3);
  color: var(--text);
  font-size: 0.9rem;
  font-weight: 500;
  text-align: left;
  transition: all 0.15s ease;
  cursor: pointer;
}

.quiz-answer-btn:hover:not(:disabled) {
  border-color: var(--primary);
  background: var(--primary-light);
  color: var(--primary);
}

.quiz-answer-btn.correct {
  border-color: #22c55e;
  background: rgba(34, 197, 94, 0.15);
  color: #22c55e;
}

.quiz-answer-btn.wrong {
  border-color: #ef4444;
  background: rgba(239, 68, 68, 0.15);
  color: #ef4444;
}

.quiz-answer-btn:disabled {
  cursor: not-allowed;
  opacity: 0.7;
}

/* Quiz results */
.quiz-results {
  padding: 2.5rem;
  text-align: center;
}

.quiz-results-score {
  font-size: 4rem;
  font-weight: 900;
  color: var(--primary);
  line-height: 1;
  margin-bottom: 0.5rem;
}

.quiz-results-label {
  font-size: 1rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.quiz-results-grade {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
}

.quiz-results-actions {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

/* Quiz sidebar stats */
.quiz-play-sidebar {
  margin-top: 1.5rem;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
}

.quiz-stats-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 1rem;
}

.quiz-stat-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.875rem;
}

.quiz-stat-row:last-child {
  border-bottom: none;
}

.quiz-stat-row .label {
  color: var(--text-muted);
}

.quiz-stat-row .value {
  font-weight: 600;
  color: var(--text);
}

/* ===========================
   Create Quiz Page
   =========================== */
.create-quiz-container {
  max-width: 760px;
  margin: 0 auto;
}

.create-quiz-header {
  margin-bottom: 1.5rem;
}

.create-quiz-title {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.create-quiz-subtitle {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.form-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1rem;
}

.form-card-title {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.form-group {
  margin-bottom: 1.1rem;
}

.form-group:last-child {
  margin-bottom: 0;
}

.form-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
}

.form-label .required {
  color: #ef4444;
  margin-left: 2px;
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: 0.6rem 0.85rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--input-bg);
  color: var(--text);
  font-size: 0.875rem;
  font-family: inherit;
  outline: none;
  transition: border-color var(--transition);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  border-color: var(--primary);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--text-faint);
}

.form-textarea {
  resize: vertical;
  min-height: 80px;
}

.form-hint {
  font-size: 0.75rem;
  color: var(--text-faint);
  margin-top: 0.3rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.type-selector {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.6rem;
}

.type-option {
  position: relative;
}

.type-option input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.type-option label {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 1rem 0.5rem;
  border-radius: var(--radius-sm);
  border: 2px solid var(--border);
  background: var(--input-bg);
  cursor: pointer;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: all var(--transition);
  text-align: center;
}

.type-option label .type-icon {
  font-size: 1.5rem;
}

.type-option input:checked + label {
  border-color: var(--primary);
  background: var(--primary-light);
  color: var(--primary);
}

.type-option label:hover {
  border-color: var(--primary);
  color: var(--text);
}

/* Question builder */
.question-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.question-item {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 1rem;
  position: relative;
}

.question-item-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
}

.question-item-header .q-num {
  background: var(--primary);
  color: white;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
}

.question-answers {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.answer-input-wrap {
  position: relative;
}

.answer-input-wrap input {
  width: 100%;
  padding: 0.5rem 0.75rem 0.5rem 2rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--input-bg);
  color: var(--text);
  font-size: 0.82rem;
  outline: none;
  transition: border-color var(--transition);
}

.answer-input-wrap input:focus {
  border-color: var(--primary);
}

.answer-input-wrap .answer-letter {
  position: absolute;
  left: 0.6rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--text-faint);
}

.answer-input-wrap.correct-answer input {
  border-color: #22c55e;
  background: rgba(34, 197, 94, 0.08);
}

.add-question-btn {
  width: 100%;
  padding: 0.75rem;
  border-radius: var(--radius-sm);
  border: 2px dashed var(--border);
  background: transparent;
  color: var(--text-muted);
  font-size: 0.875rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  transition: all var(--transition);
  margin-top: 0.5rem;
}

.add-question-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--primary-light);
}

.form-submit-row {
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

/* ===========================
   About / Info Pages
   =========================== */
.info-page {
  max-width: 760px;
  margin: 0 auto;
}

.info-hero {
  text-align: center;
  padding: 2.5rem 1rem;
  margin-bottom: 2rem;
}

.info-hero-icon {
  font-size: 3.5rem;
  margin-bottom: 1rem;
}

.info-hero-title {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 0.75rem;
}

.info-hero-subtitle {
  font-size: 1rem;
  color: var(--text-muted);
  max-width: 520px;
  margin: 0 auto;
  line-height: 1.6;
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-bottom: 2rem;
}

@media (max-width: 640px) {
  .info-grid { grid-template-columns: 1fr; }
}

.info-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  text-align: center;
}

.info-card-icon {
  font-size: 1.75rem;
  margin-bottom: 0.5rem;
}

.info-card-title {
  font-weight: 600;
  margin-bottom: 0.25rem;
  font-size: 0.95rem;
}

.info-card-desc {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.prose {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--text);
}

.prose h2 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-top: 1.5rem;
  margin-bottom: 0.6rem;
  color: var(--text);
}

.prose h2:first-child {
  margin-top: 0;
}

.prose p {
  margin-bottom: 0.8rem;
  color: var(--text-muted);
}

.prose ul {
  padding-left: 1.25rem;
  margin-bottom: 0.8rem;
  color: var(--text-muted);
}

.prose ul li {
  list-style: disc;
  margin-bottom: 0.35rem;
}

/* ===========================
   Contact Page
   =========================== */
.contact-container {
  max-width: 560px;
  margin: 0 auto;
}

.contact-header {
  text-align: center;
  margin-bottom: 2rem;
}

.contact-header h1 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
}

.contact-header p {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.contact-form {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
}

/* ===========================
   Support Creator Page
   =========================== */
.support-container {
  max-width: 600px;
  margin: 0 auto;
  text-align: center;
}

.support-hero {
  padding: 2rem 0;
  margin-bottom: 1.5rem;
}

.support-hero-emoji {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.support-hero-title {
  font-size: 1.75rem;
  font-weight: 800;
  margin-bottom: 0.75rem;
}

.support-hero-desc {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

.support-tiers {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

@media (max-width: 560px) {
  .support-tiers { grid-template-columns: 1fr; }
}

.support-tier {
  background: var(--card-bg);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  cursor: pointer;
  transition: all var(--transition);
}

.support-tier:hover,
.support-tier.selected {
  border-color: var(--primary);
  background: var(--primary-light);
}

.support-tier-amount {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 0.25rem;
}

.support-tier-label {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.support-tier-emoji {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}

/* ===========================
   Search Page
   =========================== */
.search-header {
  margin-bottom: 1.5rem;
}

.search-bar {
  position: relative;
  max-width: 600px;
  margin-bottom: 1rem;
}

.search-bar input {
  width: 100%;
  height: 48px;
  padding: 0 1rem 0 3rem;
  border-radius: var(--radius);
  border: 2px solid var(--border);
  background: var(--input-bg);
  color: var(--text);
  font-size: 1rem;
  outline: none;
  transition: border-color var(--transition);
}

.search-bar input:focus {
  border-color: var(--primary);
}

.search-bar .search-bar-icon {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-faint);
  font-size: 1.1rem;
}

.search-results-label {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.search-results-label strong {
  color: var(--text);
}

/* ===========================
   Empty State
   =========================== */
.empty-state {
  text-align: center;
  padding: 4rem 2rem;
  color: var(--text-muted);
}

.empty-state-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
  opacity: 0.5;
}

.empty-state-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text);
}

.empty-state-desc {
  font-size: 0.875rem;
  max-width: 360px;
  margin: 0 auto 1.25rem;
}

/* ===========================
   Toast Notification
   =========================== */
.toast-container {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  pointer-events: none;
}

.toast {
  padding: 0.75rem 1.1rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  box-shadow: 0 4px 16px rgba(0,0,0,0.3);
  transform: translateX(120%);
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  pointer-events: all;
  max-width: 320px;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.toast.show {
  transform: translateX(0);
}

.toast.success {
  background: #22c55e;
  color: white;
}

.toast.error {
  background: #ef4444;
  color: white;
}

.toast.info {
  background: var(--primary);
  color: white;
}

/* ===========================
   Modal
   =========================== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  backdrop-filter: blur(4px);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s;
}

.modal-overlay.open {
  opacity: 1;
  pointer-events: all;
}

.modal {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  max-width: 480px;
  width: 100%;
  transform: scale(0.92) translateY(16px);
  transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.modal-overlay.open .modal {
  transform: scale(1) translateY(0);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
}

.modal-title {
  font-size: 1.1rem;
  font-weight: 700;
}

.modal-close {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 1.2rem;
  transition: background var(--transition);
}

.modal-close:hover {
  background: var(--bg3);
}

/* ===========================
   Footer
   =========================== */
.footer {
  background: var(--sidebar-bg);
  border-top: 1px solid var(--border);
  padding: 2.5rem 1.5rem 1.5rem;
  margin-top: auto;
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 2rem;
}

@media (max-width: 900px) {
  .footer-inner { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 540px) {
  .footer-inner { grid-template-columns: 1fr; }
}

.footer-brand .footer-logo {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.footer-brand .footer-logo .logo-icon {
  width: 30px;
  height: 30px;
  background: var(--primary);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 0.85rem;
  font-weight: 900;
}

.footer-brand p {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.6;
  max-width: 240px;
  margin-bottom: 1rem;
}

.footer-socials {
  display: flex;
  gap: 0.5rem;
}

.footer-social-btn {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  color: var(--text-muted);
  transition: all var(--transition);
}

.footer-social-btn:hover {
  background: var(--primary);
  border-color: var(--primary);
  color: white;
}

.footer-col-title {
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-faint);
  margin-bottom: 0.85rem;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer-links a {
  font-size: 0.85rem;
  color: var(--text-muted);
  transition: color var(--transition);
}

.footer-links a:hover {
  color: var(--primary);
}

.footer-bottom {
  max-width: 1200px;
  margin: 1.5rem auto 0;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: 0.8rem;
  color: var(--text-faint);
}

/* ===========================
   Responsive: Mobile Sidebar
   =========================== */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 49;
  backdrop-filter: blur(2px);
}

@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
    transition: transform 0.25s ease, width 0.25s ease;
  }

  .sidebar.mobile-open {
    transform: translateX(0);
    width: var(--sidebar-width) !important;
  }

  .sidebar-overlay.visible {
    display: block;
  }

  .main {
    margin-left: 0 !important;
  }

  .browse-title {
    font-size: 1.1rem;
  }

  .content {
    padding: 1rem;
  }
}

/* ===========================
   Scrollbar
   =========================== */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-faint);
}

/* ===========================
   Utility
   =========================== */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
}

.skeleton {
  background: linear-gradient(90deg, var(--bg3) 25%, var(--bg4) 50%, var(--bg3) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-sm);
}

@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.badge-new {
  display: inline-block;
  padding: 0.1rem 0.45rem;
  border-radius: 4px;
  font-size: 0.65rem;
  font-weight: 700;
  background: #22c55e;
  color: white;
  letter-spacing: 0.04em;
}

.badge-hot {
  display: inline-block;
  padding: 0.1rem 0.45rem;
  border-radius: 4px;
  font-size: 0.65rem;
  font-weight: 700;
  background: #ef4444;
  color: white;
  letter-spacing: 0.04em;
}

/* ===========================
   Lobby
   =========================== */
.lobby-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 1.5rem;
}

.lobby-preview-grid {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 0;
}

@media (max-width: 700px) {
  .lobby-preview-grid { grid-template-columns: repeat(4, 1fr); }
}

.lobby-preview-item {
  position: relative;
  aspect-ratio: 1;
  overflow: hidden;
}

.lobby-preview-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.lobby-preview-item:hover img {
  transform: scale(1.08);
}

.lobby-preview-item span {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 0.2rem 0.3rem;
  font-size: 0.65rem;
  font-weight: 600;
  background: linear-gradient(transparent, rgba(0,0,0,0.8));
  color: white;
  text-align: center;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.lobby-info {
  padding: 1.75rem 2rem;
  text-align: center;
}

.lobby-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.lobby-desc {
  color: var(--text-muted);
  font-size: 0.875rem;
  max-width: 500px;
  margin: 0 auto 1.5rem;
  line-height: 1.6;
}

.lobby-size-label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.75rem;
}

.lobby-sizes {
  display: flex;
  justify-content: center;
  gap: 0.65rem;
  flex-wrap: wrap;
  margin-bottom: 1.75rem;
}

.lobby-size-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.15rem;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-sm);
  border: 2px solid var(--border);
  background: var(--bg3);
  cursor: pointer;
  transition: all var(--transition);
  min-width: 80px;
}

.lobby-size-btn:hover {
  border-color: var(--primary);
  background: var(--primary-light);
}

.lobby-size-btn.selected {
  border-color: var(--primary);
  background: var(--primary-light);
}

.lobby-size-btn .size-num {
  font-size: 1.4rem;
  font-weight: 900;
  color: var(--primary);
  line-height: 1;
}

.lobby-size-btn .size-label {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text);
}

.lobby-size-btn .size-rounds {
  font-size: 0.7rem;
  color: var(--text-faint);
}

.lobby-start-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 3rem;
  border-radius: var(--radius-sm);
  font-size: 1.05rem;
  font-weight: 700;
  background: var(--primary);
  color: white;
  transition: background var(--transition), transform 0.1s, box-shadow 0.2s;
  box-shadow: 0 4px 16px rgba(59, 130, 246, 0.35);
}

.lobby-start-btn:hover {
  background: var(--primary-hover);
  box-shadow: 0 6px 20px rgba(59, 130, 246, 0.5);
}

.lobby-start-btn:active {
  transform: scale(0.97);
}

/* ===========================
   Tournament Match Arena
   =========================== */
.tournament-header {
  margin-bottom: 1.5rem;
}

.tournament-round-label {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.65rem;
  flex-wrap: wrap;
}

.undo-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.3rem 0.7rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg3);
  color: var(--text-muted);
  font-size: 0.78rem;
  font-weight: 500;
  cursor: pointer;
  margin-left: auto;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}

.undo-btn:hover:not(:disabled) {
  background: var(--bg4);
  color: var(--text);
  border-color: var(--text-faint);
}

.undo-btn--disabled,
.undo-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.round-badge {
  display: inline-block;
  padding: 0.3rem 0.85rem;
  border-radius: 20px;
  background: var(--primary);
  color: white;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.match-counter {
  font-size: 0.875rem;
  color: var(--text-muted);
  font-weight: 500;
}

.tournament-progress {
  height: 6px;
  background: var(--bg4);
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: 0.4rem;
}

.tournament-progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), #60a5fa);
  border-radius: 4px;
  transition: width 0.4s ease;
}

.tournament-progress-text {
  font-size: 0.75rem;
  color: var(--text-faint);
}

/* The two-option arena */
.tournament-arena {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 1rem;
  align-items: stretch;
  margin-bottom: 1.5rem;
}

@media (max-width: 600px) {
  .tournament-arena {
    grid-template-columns: 1fr;
    grid-template-rows: 1fr auto 1fr;
  }
  .vs-divider {
    padding: 0 !important;
    justify-content: center;
  }
}

.tournament-option {
  background: var(--card-bg);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
  display: flex;
  flex-direction: column;
}

.tournament-option:hover {
  border-color: var(--primary);
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(59, 130, 246, 0.25);
}

.tournament-option:hover .option-overlay {
  opacity: 1;
}

.option-img-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 1 / 1;
  overflow: hidden;
  background: var(--bg4);
}

.option-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.35s ease;
  display: block;
}

.tournament-option:hover .option-img-wrap img {
  transform: scale(1.06);
}

.option-overlay {
  position: absolute;
  inset: 0;
  background: rgba(59, 130, 246, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.2s;
}

.option-pick-label {
  font-size: 1.4rem;
  font-weight: 900;
  color: white;
  letter-spacing: 0.1em;
  text-shadow: 0 2px 8px rgba(0,0,0,0.5);
}

.option-name {
  padding: 0.85rem 1rem;
  font-size: 0.95rem;
  font-weight: 700;
  text-align: center;
  color: var(--text);
  background: var(--card-bg);
  border-top: 1px solid var(--border);
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Winner / Loser animations */
.tournament-option.winner-chosen {
  border-color: #22c55e;
  animation: winnerPulse 0.5s ease forwards;
}

.tournament-option.loser-rejected {
  animation: loserFade 0.5s ease forwards;
}

@keyframes winnerPulse {
  0%   { transform: scale(1); box-shadow: none; }
  50%  { transform: scale(1.04); box-shadow: 0 0 30px rgba(34, 197, 94, 0.5); }
  100% { transform: scale(1.04); box-shadow: 0 0 30px rgba(34, 197, 94, 0.5); }
}

@keyframes loserFade {
  0%   { opacity: 1; transform: scale(1); }
  100% { opacity: 0.25; transform: scale(0.95); }
}

/* VS divider */
.vs-divider {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 0.5rem;
}

.vs-text {
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--text-faint);
  letter-spacing: 0.05em;
  background: var(--bg4);
  border: 2px solid var(--border);
  border-radius: 50%;
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

/* Match history */
.match-history {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  margin-bottom: 1.5rem;
}

.match-history-title {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-faint);
  margin-bottom: 0.75rem;
}

.match-history-list {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.match-history-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.82rem;
  padding: 0.3rem 0;
  border-bottom: 1px solid var(--border);
}

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

.match-history-item img {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
}

.mh-winner {
  font-weight: 700;
  color: #22c55e;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.mh-winner img {
  border: 2px solid #22c55e;
}

.mh-beat {
  color: var(--text-faint);
  font-size: 0.75rem;
}

.mh-loser {
  color: var(--text-muted);
  text-decoration: line-through;
  opacity: 0.6;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.mh-round {
  margin-left: auto;
  font-size: 0.7rem;
  color: var(--text-faint);
  white-space: nowrap;
  padding: 0.1rem 0.4rem;
  background: var(--badge-bg);
  border-radius: 4px;
}

/* ===========================
   Winner / Champion Screen
   =========================== */
.winner-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 1rem 0 2rem;
}

.winner-confetti {
  position: fixed;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: 5;
}

.confetti-piece {
  position: absolute;
  top: -20px;
  animation: confettiFall 3s ease-in forwards;
}

@keyframes confettiFall {
  0%   { transform: translateY(0) rotate(0deg); opacity: 1; }
  80%  { opacity: 1; }
  100% { transform: translateY(110vh) rotate(720deg); opacity: 0; }
}

.winner-card {
  background: var(--card-bg);
  border: 2px solid var(--primary);
  border-radius: var(--radius);
  padding: 2.5rem 3rem;
  text-align: center;
  max-width: 460px;
  width: 100%;
  box-shadow: 0 8px 40px rgba(59, 130, 246, 0.25);
  position: relative;
  z-index: 10;
  margin-bottom: 2rem;
}

.winner-crown {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
  animation: crownBounce 1s ease infinite alternate;
}

@keyframes crownBounce {
  from { transform: translateY(0) rotate(-5deg); }
  to   { transform: translateY(-6px) rotate(5deg); }
}

.winner-label {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--primary);
  margin-bottom: 1rem;
}

.winner-img {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--primary);
  margin: 0 auto 1rem;
  box-shadow: 0 0 30px rgba(59, 130, 246, 0.4);
}

.winner-name {
  font-size: 1.6rem;
  font-weight: 900;
  margin-bottom: 0.4rem;
}

.winner-subtitle {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.winner-actions {
  display: flex;
  justify-content: center;
  gap: 0.65rem;
  flex-wrap: wrap;
}

/* Bracket summary */
.bracket-summary {
  width: 100%;
  max-width: 700px;
  position: relative;
  z-index: 10;
}

.bracket-summary-title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 1rem;
  text-align: center;
}

.bracket-round {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  margin-bottom: 0.75rem;
}

.bracket-round-name {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--primary);
  margin-bottom: 0.6rem;
}

.bracket-matches {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.bracket-match {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.82rem;
  padding: 0.3rem 0;
  border-bottom: 1px solid var(--border);
}

.bracket-match:last-child {
  border-bottom: none;
}

.bracket-match img {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
}

.bm-winner {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-weight: 700;
  color: #22c55e;
}

.bm-vs {
  color: var(--text-faint);
  font-size: 0.75rem;
  white-space: nowrap;
}

.bm-loser {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--text-muted);
  opacity: 0.6;
  text-decoration: line-through;
}

/* ===========================
   Create Quiz — Item List
   =========================== */
.create-item-note {
  font-size: 0.82rem;
  color: var(--text-muted);
  background: var(--primary-light);
  border: 1px solid var(--primary);
  border-radius: var(--radius-sm);
  padding: 0.65rem 1rem;
  margin-bottom: 1rem;
  line-height: 1.5;
}

/* ===========================
   Auth UI — Header User Menu
   =========================== */
#auth-area {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.user-menu {
  position: relative;
}

.user-menu-btn {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.3rem 0.65rem 0.3rem 0.35rem;
  cursor: pointer;
  color: var(--text);
  font-size: 0.85rem;
  transition: background var(--transition), border-color var(--transition);
}

.user-menu-btn:hover {
  background: var(--bg4);
  border-color: var(--primary);
}

.user-avatar-sm {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--primary);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.8rem;
}

.user-menu-name {
  font-weight: 600;
  max-width: 100px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.user-dropdown {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  width: 240px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 8px 24px rgba(0,0,0,0.3);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: opacity 0.15s, visibility 0.15s, transform 0.15s;
  z-index: 200;
  overflow: hidden;
}

.user-dropdown.open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.user-dropdown-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.85rem 1rem;
}

.user-avatar-lg {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--primary);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.user-dropdown-divider {
  height: 1px;
  background: var(--border);
}

.user-dropdown-item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.6rem 1rem;
  font-size: 0.85rem;
  color: var(--text);
  text-decoration: none;
  transition: background var(--transition);
  cursor: pointer;
}

.user-dropdown-item:hover {
  background: var(--bg3);
}

/* ===========================
   Auth Pages — Sign In / Sign Up
   =========================== */
.auth-container {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 3rem 1rem;
  min-height: 60vh;
}

.auth-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  width: 100%;
  max-width: 420px;
  box-shadow: var(--card-shadow);
}

.auth-header {
  text-align: center;
  margin-bottom: 1.5rem;
}

.auth-footer {
  text-align: center;
  margin-top: 1.25rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--text-muted);
}

.auth-footer a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 600;
}

.auth-footer a:hover {
  text-decoration: underline;
}

/* ===========================
   Profile Page
   =========================== */
.profile-container {
  max-width: 900px;
  margin: 0 auto;
  padding: 1rem 0;
}

.profile-header-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  box-shadow: var(--card-shadow);
}

.profile-avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: var(--primary);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 2rem;
  flex-shrink: 0;
}

.profile-info {
  flex: 1;
  min-width: 150px;
}

.profile-username {
  font-size: 1.4rem;
  font-weight: 800;
  margin-bottom: 0.15rem;
}

.profile-email {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.profile-joined {
  font-size: 0.8rem;
  color: var(--text-faint);
  margin-top: 0.25rem;
}

.profile-stats-row {
  display: flex;
  gap: 1.5rem;
  margin-left: auto;
}

.profile-stat {
  text-align: center;
  min-width: 70px;
}

.profile-stat-num {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--primary);
}

.profile-stat-label {
  font-size: 0.75rem;
  color: var(--text-faint);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* ===========================
   My Quizzes Page
   =========================== */
.my-quizzes-container {
  max-width: 900px;
  margin: 0 auto;
  padding: 1rem 0;
}

.my-quizzes-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
}

.my-quizzes-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.my-quiz-row {
  display: flex;
  align-items: center;
  gap: 1rem;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.85rem 1rem;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.my-quiz-row:hover {
  border-color: var(--primary);
  box-shadow: var(--card-shadow-hover);
}

.my-quiz-thumb {
  width: 80px;
  height: 50px;
  border-radius: var(--radius-sm);
  object-fit: cover;
  flex-shrink: 0;
}

.my-quiz-info {
  flex: 1;
  min-width: 0;
}

.my-quiz-title {
  font-weight: 700;
  font-size: 0.95rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.my-quiz-meta {
  font-size: 0.78rem;
  color: var(--text-faint);
  margin-top: 0.2rem;
}

.my-quiz-actions {
  display: flex;
  gap: 0.5rem;
  flex-shrink: 0;
}

/* ===========================
   Text-only tournament option
   =========================== */
.option-text-wrap {
  position: relative;
  border-radius: var(--radius);
  min-height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition);
}

.option-text-wrap:hover {
  transform: scale(1.02);
}

.option-text-name {
  font-size: 1.8rem;
  font-weight: 800;
  text-align: center;
  word-break: break-word;
}

.option-text-wrap .option-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.5);
  border-radius: var(--radius);
  opacity: 0;
  transition: opacity 0.2s;
}

.option-text-wrap:hover .option-overlay {
  opacity: 1;
}

/* Winner screen text fallback */
.winner-img-text {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  background: var(--primary);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  font-weight: 800;
  text-align: center;
  word-break: break-word;
  padding: 1rem;
  margin: 1rem auto;
}

/* Lobby preview text fallback */
.lobby-preview-text {
  width: 100%;
  aspect-ratio: 1;
  background: var(--bg3);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 600;
  text-align: center;
  padding: 0.25rem;
  word-break: break-word;
}

/* Small button variant */
.btn-sm {
  padding: 0.3rem 0.7rem;
  font-size: 0.8rem;
}

/* ===========================
   Responsive tweaks for new elements
   =========================== */
@media (max-width: 640px) {
  .profile-header-card {
    flex-direction: column;
    text-align: center;
  }

  .profile-stats-row {
    margin-left: 0;
    justify-content: center;
  }

  .my-quiz-row {
    flex-wrap: wrap;
  }

  .my-quiz-thumb {
    width: 60px;
    height: 38px;
  }

  .my-quiz-actions {
    width: 100%;
    justify-content: flex-end;
  }

  .user-menu-name {
    display: none;
  }
}

/* ===========================
   Ad Banner Placeholders
   =========================== */
.ad-banner {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 90px;
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text-faint);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

#ad-banner-top {
  margin: 0 auto;
  max-width: 728px;
  min-height: 90px;
  margin-top: 4px;
  margin-bottom: 4px;
}

.ad-banner-feed {
  min-height: 100px;
  margin-bottom: 1rem;
}

.ad-banner-sidebar {
  margin: 0.75rem;
  min-height: 250px;
}

.ad-banner-label {
  opacity: 0.5;
}

@media (max-width: 768px) {
  .ad-banner-sidebar {
    display: none;
  }
  #ad-banner-top {
    min-height: 50px;
    margin: 2px 8px;
  }
}

/* ===========================
   Admin Badge
   =========================== */
.admin-badge {
  display: inline-block;
  background: linear-gradient(135deg, #f59e0b, #ef4444);
  color: #fff;
  font-size: 0.6rem;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 4px;
  letter-spacing: 0.05em;
  vertical-align: middle;
  margin-left: 4px;
  text-transform: uppercase;
}

/* ===========================
   Verification Code Input
   =========================== */
.verify-section {
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ===========================
   Comments
   =========================== */
.comments-section { margin-top: 2rem; }
.comments-title { font-size: 1.1rem; font-weight: 700; margin-bottom: 1rem; }
.comment-form {
  display: flex; gap: 0.75rem; align-items: flex-start;
  margin-bottom: 1.5rem; padding: 1rem;
  background: var(--card-bg); border-radius: var(--radius); border: 1px solid var(--border);
}
.comment-form-avatar {
  width: 36px; height: 36px; border-radius: 50%; background: var(--primary);
  color: #fff; display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 0.85rem; flex-shrink: 0;
}
.comment-signin-prompt {
  padding: 1rem; text-align: center; color: var(--text-muted); font-size: 0.9rem;
  background: var(--card-bg); border-radius: var(--radius); border: 1px solid var(--border);
  margin-bottom: 1.5rem;
}
.comment-signin-prompt a { color: var(--primary); font-weight: 600; }
.comments-list { display: flex; flex-direction: column; gap: 0.75rem; }
.comments-empty { text-align: center; padding: 2rem; color: var(--text-faint); font-size: 0.9rem; }
.comment-item {
  display: flex; gap: 0.75rem; padding: 1rem;
  background: var(--card-bg); border-radius: var(--radius); border: 1px solid var(--border);
}
.comment-avatar {
  width: 32px; height: 32px; border-radius: 50%; background: var(--bg3);
  color: var(--text-muted); display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 0.8rem; flex-shrink: 0; cursor: pointer;
}
.comment-content { flex: 1; min-width: 0; }
.comment-header { display: flex; align-items: center; gap: 0.5rem; margin-bottom: 0.35rem; }
.comment-username {
  font-weight: 600; font-size: 0.85rem; color: var(--primary); cursor: pointer;
}
.comment-username:hover { text-decoration: underline; }
.comment-time { font-size: 0.75rem; color: var(--text-faint); }
.comment-delete {
  margin-left: auto; background: none; border: none; color: var(--text-faint);
  cursor: pointer; font-size: 0.8rem; padding: 0 0.25rem;
}
.comment-delete:hover { color: var(--warning); }
.comment-body { font-size: 0.9rem; line-height: 1.5; color: var(--text); word-break: break-word; }

/* ===========================
   Leaderboard
   =========================== */
.leaderboard-section { margin-top: 2rem; }
.leaderboard-title { font-size: 1.1rem; font-weight: 700; margin-bottom: 0.25rem; }
.leaderboard-subtitle { font-size: 0.8rem; color: var(--text-faint); margin-bottom: 1rem; }
.leaderboard-empty { text-align: center; padding: 2rem; color: var(--text-faint); font-size: 0.9rem; }
.leaderboard-list { display: flex; flex-direction: column; gap: 0.5rem; }
.leaderboard-item {
  display: flex; align-items: center; gap: 0.6rem; padding: 0.6rem 0.75rem;
  background: var(--card-bg); border-radius: var(--radius-sm); border: 1px solid var(--border);
}
.leaderboard-rank {
  font-weight: 700; font-size: 0.85rem; color: var(--text-muted); min-width: 28px;
}
.leaderboard-item:nth-child(1) .leaderboard-rank { color: #f59e0b; }
.leaderboard-item:nth-child(2) .leaderboard-rank { color: #94a3b8; }
.leaderboard-item:nth-child(3) .leaderboard-rank { color: #b45309; }
.leaderboard-img {
  width: 32px; height: 32px; border-radius: var(--radius-sm); object-fit: cover;
}
.leaderboard-name { font-weight: 600; font-size: 0.85rem; min-width: 80px; }
.leaderboard-bar-wrap {
  flex: 1; height: 8px; background: var(--bg3); border-radius: 4px; overflow: hidden;
}
.leaderboard-bar {
  height: 100%; background: linear-gradient(90deg, var(--primary), #8b5cf6);
  border-radius: 4px; min-width: 2px; transition: width 0.4s ease;
}
.leaderboard-pct { font-weight: 700; font-size: 0.8rem; min-width: 40px; text-align: right; }
.leaderboard-wins { font-size: 0.75rem; color: var(--text-faint); min-width: 50px; text-align: right; }

/* ===========================
   Resume Banner
   =========================== */
.lobby-resume-banner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; padding: 1rem 1.25rem; margin-top: 1.5rem;
  background: var(--primary-light); border: 1px solid var(--primary);
  border-left: 4px solid var(--primary); border-radius: var(--radius);
}
.resume-info { display: flex; flex-direction: column; gap: 0.25rem; }
.resume-info strong { font-size: 0.95rem; }
.resume-info span { font-size: 0.8rem; color: var(--text-muted); }
.resume-actions { display: flex; gap: 0.5rem; flex-shrink: 0; }

@media (max-width: 500px) {
  .lobby-resume-banner { flex-direction: column; align-items: flex-start; }
  .leaderboard-item { flex-wrap: wrap; }
  .leaderboard-bar-wrap { min-width: 100%; order: 10; }
}

/* ===========================
   Clickable @username
   =========================== */
.quiz-card-creator { cursor: pointer; }
.quiz-card-creator:hover { color: var(--primary); text-decoration: underline; }