:root {
  --bg: #f8fafc;
  --ink: #102a43;
  --brand: #0ea5a4;
  --accent: #f59e0b;
  --danger: #ef4444;
  --card: #ffffff;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Cairo", sans-serif;
  background: radial-gradient(circle at 10% 0%, #d6f5f4, transparent 40%), radial-gradient(circle at 90% 10%, #ffe9c8, transparent 35%), var(--bg);
  color: var(--ink);
  min-height: 100vh;
  padding: 16px;
  padding-top: 82px;
}
.main-wrap, main { width: min(1320px, 100%); margin-inline: auto; }
.bg-shape { position: fixed; z-index: -1; opacity: .12; border-radius: 50%; }
.bg1 { width: 300px; height: 300px; background: #0ea5a4; top: -80px; left: -80px; }
.bg2 { width: 280px; height: 280px; background: #f59e0b; bottom: -100px; right: -70px; }
.topbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 16px;
}
#site-navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 99999;
  height: 62px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  direction: rtl;
  background: rgba(10, 14, 30, 0.72);
  backdrop-filter: blur(18px) saturate(180%);
  -webkit-backdrop-filter: blur(18px) saturate(180%);
  border-bottom: 1px solid rgba(255,255,255,0.08);
  box-shadow: 0 4px 32px rgba(0,0,0,0.35), inset 0 1px 0 rgba(255,255,255,0.06);
}
#site-navbar::after {
  content: "";
  position: absolute;
  bottom: 0; left: 10%; right: 10%;
  height: 1px;
  background: linear-gradient(90deg, transparent, #a855f7 30%, #3b82f6 70%, transparent);
  opacity: 0.6;
}
.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex-shrink: 0;
}
.nav-brand-icon {
  width: 38px; height: 38px;
  background: linear-gradient(135deg, #a855f7, #3b82f6);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 18px;
  box-shadow: 0 0 16px rgba(168,85,247,0.5);
  flex-shrink: 0;
}
.nav-brand-text {
  font-size: 15px;
  font-weight: 800;
  color: #fff;
  letter-spacing: 0.3px;
  line-height: 1.1;
}
.nav-brand-text span {
  display: block;
  font-size: 10px;
  font-weight: 400;
  color: rgba(255,255,255,0.45);
  letter-spacing: 1px;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 6px;
  list-style: none;
  margin: 0; padding: 0;
}
.nav-links a {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  border-radius: 10px;
  text-decoration: none;
  font-size: 13px;
  font-weight: 700;
  color: rgba(255,255,255,0.65);
  transition: all 0.22s ease;
  position: relative;
  white-space: nowrap;
  border: 1px solid transparent;
}
.nav-links a:hover {
  color: #fff;
  background: rgba(255,255,255,0.07);
  border-color: rgba(255,255,255,0.1);
}
.nav-links a.nav-active {
  color: #fff;
  background: linear-gradient(135deg, rgba(168,85,247,0.25), rgba(59,130,246,0.25));
  border-color: rgba(168,85,247,0.35);
  box-shadow: 0 0 18px rgba(168,85,247,0.2);
}
.nav-links a.nav-active::before {
  content: "";
  position: absolute;
  bottom: -1px;
  left: 20%;
  right: 20%;
  height: 2px;
  background: linear-gradient(90deg, #a855f7, #3b82f6);
  border-radius: 2px;
}
.nav-icon { font-size: 15px; }
#nav-toggle {
  display: none;
  background: rgba(255,255,255,0.07);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 8px;
  width: 38px; height: 38px;
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  padding: 0;
}
#nav-toggle span {
  display: block;
  width: 18px; height: 2px;
  background: rgba(255,255,255,0.8);
  border-radius: 2px;
  transition: all 0.3s ease;
}
#nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
#nav-toggle.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
#nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
#nav-mobile {
  display: none;
  position: fixed;
  top: 62px; left: 0; right: 0;
  background: rgba(10, 14, 30, 0.97);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255,255,255,0.08);
  padding: 12px 16px 16px;
  z-index: 99998;
  flex-direction: column;
  gap: 6px;
  animation: slideDown 0.25s ease;
}
#nav-mobile.open { display: flex; }
#nav-mobile a {
  display: flex; align-items: center; gap: 10px;
  padding: 11px 14px;
  border-radius: 10px;
  text-decoration: none;
  font-size: 14px; font-weight: 700;
  color: rgba(255,255,255,0.7);
  border: 1px solid transparent;
  transition: all 0.2s;
}
#nav-mobile a:hover { color: #fff; background: rgba(255,255,255,0.06); }
#nav-mobile a.nav-active {
  color: #fff;
  background: linear-gradient(135deg, rgba(168,85,247,0.2), rgba(59,130,246,0.2));
  border-color: rgba(168,85,247,0.3);
}
@keyframes slideDown {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}
.topbar-right {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.session-info {
  background: #e0f2fe;
  color: #075985;
  border-radius: 999px;
  padding: 6px 10px;
  font-size: .9rem;
  font-weight: 700;
}
h1 { margin: 0; font-size: 2rem; }
h2 { margin: 0 0 12px; font-size: 1.2rem; }
h3 { margin: 0 0 8px; font-size: 1rem; }
p { margin: 6px 0; }
.tabs { display: flex; gap: 8px; flex-wrap: wrap; }
.tab, .btn {
  border: none;
  border-radius: 12px;
  padding: 10px 14px;
  cursor: pointer;
  font-family: inherit;
  font-weight: 700;
  transition: transform .15s ease, opacity .15s ease;
}
.tab { background: #e6eef5; }
.tab.active { background: var(--brand); color: #fff; }
.btn { background: var(--brand); color: #fff; }
.btn.secondary { background: #334e68; }
.btn.danger { background: var(--danger); }
.tab:hover, .btn:hover { transform: translateY(-1px); opacity: .95; }
.view { display: none; }
.view.active { display: block; animation: fade .22s ease; }
@keyframes fade { from {opacity: .6; transform: translateY(4px);} to {opacity: 1; transform: none;} }
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 12px;
  margin-bottom: 12px;
}
.auth-grid {
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
}
.card {
  background: var(--card);
  border-radius: 18px;
  padding: 14px;
  box-shadow: 0 8px 20px rgba(16,42,67,.08);
  border-top: 5px solid #e2e8f0;
}
.section-1 { background: #fff1f2; }
.section-2 { background: #fff7ed; }
.section-3 { background: #fffbeb; }
.section-4 { background: #f7fee7; }
.section-5 { background: #f0fdf4; }
.section-6 { background: #f0fdfa; }
.section-7 { background: #f0f9ff; }
.section-8 { background: #eef2ff; }
.section-9 { background: #faf5ff; }
.card.wide { margin-bottom: 12px; }
.field-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 10px;
}
input, select {
  border: 1px solid #d9e2ec;
  border-radius: 10px;
  padding: 10px;
  min-width: 120px;
  flex: 1;
  font-family: inherit;
}
small, .muted { color: #627d98; }
table {
  width: 100%;
  border-collapse: collapse;
}
th, td {
  padding: 8px;
  border-bottom: 1px solid #e6edf3;
  text-align: right;
  font-size: .94rem;
}
.action-buttons { display: flex; gap: 6px; flex-wrap: wrap; }
.student-photo-input { display: none; }
.student-photo-badge,
.profile-photo {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  border: 2px solid #dbeafe;
  background: #eff6ff;
  color: #1e3a8a;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  font-weight: 800;
}
.student-photo-badge img,
.profile-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.profile-photo {
  margin: 0 auto 10px;
  width: 78px;
  height: 78px;
}
.action-buttons button {
  border: none;
  border-radius: 8px;
  padding: 5px 8px;
  font-weight: 700;
  cursor: pointer;
}
.plus { background: #dcfce7; color: #166534; }
.minus { background: #fee2e2; color: #991b1b; }
.code-chip {
  display: inline-block;
  background: #e6f7f7;
  color: #0f766e;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: .82rem;
}
#live-board .row {
  display: grid;
  grid-template-columns: 50px 1fr auto;
  gap: 10px;
  align-items: center;
  padding: 12px;
  border-bottom: 1px solid #e6edf3;
}
.rank { font-size: 1.2rem; font-weight: 800; color: #1e3a8a; }
.points { font-size: 1.1rem; font-weight: 800; color: #0f766e; }
.badges { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 8px; }
.badge {
  background: #fff7e8;
  border: 1px solid #fcd34d;
  color: #7c2d12;
  padding: 4px 8px;
  border-radius: 999px;
  font-size: .82rem;
}
.team-chip {
  display: inline-block;
  margin-inline-start: 6px;
  padding: 2px 8px;
  border-radius: 999px;
  background: #eef2ff;
  color: #3730a3;
  font-size: .82rem;
  font-weight: 700;
}
.level-chip {
  display: inline-block;
  margin-inline-start: 6px;
  padding: 2px 8px;
  border-radius: 999px;
  background: #fff7ed;
  color: #9a3412;
  font-size: .8rem;
  font-weight: 800;
}
.reward-store-list {
  margin-top: 8px;
  display: grid;
  gap: 6px;
}
.reward-store-item {
  border: 1px solid #e6edf3;
  border-radius: 10px;
  padding: 8px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}
.reward-store-item span {
  font-size: .9rem;
}
.reward-store-item button {
  min-width: 80px;
  padding: 6px 10px;
  border-radius: 8px;
}
.reward-store-item button[disabled] {
  opacity: .55;
  cursor: not-allowed;
}
.mini-challenge-live {
  margin-top: 8px;
  padding: 8px 10px;
  border-radius: 10px;
  border: 1px solid #bfdbfe;
  background: #eff6ff;
  color: #1e3a8a;
  font-weight: 700;
}
.mini-progress {
  width: 100%;
  height: 10px;
  border-radius: 999px;
  background: #e2e8f0;
  overflow: hidden;
  margin-top: 8px;
}
.mini-progress-fill {
  width: 0%;
  height: 100%;
  background: linear-gradient(90deg, #22c55e, #06b6d4);
  transition: width .25s ease;
}
.mini-meta {
  margin-top: 6px;
  font-size: .88rem;
}
#live-teams .team-row {
  display: flex;
  justify-content: space-between;
  padding: 8px 10px;
  border: 1px solid #e6edf3;
  border-radius: 10px;
  margin-bottom: 6px;
}
.live-class-head {
  background: #eff6ff;
  border: 1px solid #bfdbfe;
  color: #1e3a8a;
  border-radius: 12px;
  padding: 10px 12px;
  margin-bottom: 10px;
  font-weight: 700;
}
.live-summary-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 8px;
  margin-bottom: 10px;
}
.live-stat {
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: 12px;
  padding: 10px;
}
.live-stat .k {
  font-size: .78rem;
  color: #64748b;
}
.live-stat .v {
  font-size: 1.2rem;
  font-weight: 800;
  color: #0f172a;
}
.live-detail-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 10px;
  margin-top: 12px;
}
.live-detail-card {
  border: 1px solid #e2e8f0;
  border-radius: 12px;
  padding: 10px;
  background: #ffffff;
}
.live-item {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  padding: 6px 0;
  border-bottom: 1px dashed #e2e8f0;
}
.live-item:last-child {
  border-bottom: none;
}
.live-sub {
  color: #64748b;
  font-size: .82rem;
}
pre {
  background: #0b1f33;
  color: #d9e2ec;
  padding: 10px;
  border-radius: 10px;
  white-space: pre-wrap;
}
.leaderboard { min-height: 450px; }
#students-table { overflow-x: auto; }
#students-table table { min-width: 860px; }
.wheel-wrap {
  position: relative;
  width: 220px;
  margin: 8px auto 12px;
}
.wheel-pointer {
  text-align: center;
  color: #b45309;
  font-weight: 800;
  margin-bottom: 4px;
}
.student-wheel {
  width: 220px;
  height: 220px;
  border-radius: 50%;
  border: 8px solid #fff;
  box-shadow: 0 10px 20px rgba(16, 42, 67, .16);
  background: conic-gradient(#5eead4 0deg 120deg, #fcd34d 120deg 240deg, #93c5fd 240deg 360deg);
  transition: transform 3.2s cubic-bezier(.12,.88,.18,1);
  display: flex;
  align-items: center;
  justify-content: center;
}
.wheel-center-text {
  width: 110px;
  height: 110px;
  border-radius: 50%;
  background: rgba(255,255,255,.95);
  color: #0f172a;
  font-size: .9rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 8px;
}
#spin-wheel[disabled] {
  opacity: .7;
  cursor: not-allowed;
}
.lucky-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(95px, 1fr));
  gap: 8px;
  margin-bottom: 10px;
}
.lucky-card {
  border-radius: 10px;
  padding: 9px 6px;
  text-align: center;
  background: #e2e8f0;
  color: #334155;
  font-weight: 800;
  font-size: .88rem;
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1.25;
  word-break: break-word;
  border: 2px solid transparent;
  transition: transform .15s ease, background .15s ease, border-color .15s ease;
}
.lucky-card.active {
  background: #bae6fd;
  border-color: #0284c7;
  transform: translateY(-2px);
}
.lucky-card.winner {
  background: #bbf7d0;
  border-color: #16a34a;
  color: #14532d;
}
#start-lucky-game[disabled] {
  opacity: .7;
  cursor: not-allowed;
}
.feature-fullscreen-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(11, 31, 51, .65);
  z-index: 998;
}
.feature-card .exit-fullscreen {
  display: none;
}
body.feature-fullscreen {
  overflow: hidden;
}
body.feature-fullscreen .feature-fullscreen-backdrop {
  display: block;
}
.feature-card.fullscreen-feature {
  position: fixed;
  inset: 14px;
  z-index: 999;
  margin: 0;
  overflow: auto;
  border-radius: 18px;
}
.feature-card.fullscreen-feature .exit-fullscreen {
  display: inline-block;
}
.feature-card.fullscreen-feature .wheel-wrap {
  width: min(80vw, 520px);
}
.feature-card.fullscreen-feature .student-wheel {
  width: min(80vw, 520px);
  height: min(80vw, 520px);
}
.feature-card.fullscreen-feature .wheel-center-text {
  width: min(34vw, 170px);
  height: min(34vw, 170px);
  font-size: 1.1rem;
}
.feature-card.fullscreen-feature .lucky-grid {
  grid-template-columns: repeat(auto-fit, minmax(135px, 1fr));
  gap: 12px;
}
.feature-card.fullscreen-feature .lucky-card {
  padding: 12px 10px;
  font-size: 1rem;
  min-height: 60px;
}
.feature-card.fullscreen-feature .countdown-display {
  font-size: min(18vw, 8rem);
  line-height: 1.05;
  padding: 20px 10px;
}
.celebration-overlay {
  position: fixed;
  inset: 0;
  z-index: 2500;
  display: none;
  align-items: center;
  justify-content: center;
  background: radial-gradient(circle at center, rgba(2,132,199,.18), rgba(11,31,51,.72));
  pointer-events: none;
}
.celebration-overlay.show {
  display: flex;
}
.celebration-card {
  background: #ffffff;
  border: 2px solid #93c5fd;
  border-radius: 18px;
  padding: 18px 20px;
  min-width: min(92vw, 520px);
  text-align: center;
  box-shadow: 0 20px 40px rgba(2, 132, 199, .25);
  transform: scale(.9);
  animation: celebration-pop .45s ease forwards;
}
.celebration-card h2 {
  margin: 0 0 6px 0;
  font-size: clamp(1.2rem, 3.6vw, 2rem);
}
.celebration-card p {
  margin: 0;
  font-size: clamp(1rem, 2.8vw, 1.25rem);
  font-weight: 700;
  color: #1e3a8a;
}
.celebration-confetti {
  position: absolute;
  inset: 0;
  overflow: hidden;
}
.celebration-piece {
  position: absolute;
  top: -20px;
  width: 10px;
  height: 18px;
  border-radius: 6px;
  opacity: .95;
  animation: confetti-fall 1.8s linear forwards;
}
@keyframes celebration-pop {
  0% { transform: scale(.75); opacity: .1; }
  80% { transform: scale(1.04); opacity: 1; }
  100% { transform: scale(1); opacity: 1; }
}
@keyframes confetti-fall {
  0% { transform: translateY(0) rotate(0deg); opacity: 0; }
  8% { opacity: 1; }
  100% { transform: translateY(105vh) rotate(520deg); opacity: .05; }
}
.countdown-display {
  background: #0b1f33;
  color: #e0f2fe;
  border-radius: 12px;
  text-align: center;
  font-weight: 800;
  font-size: 2rem;
  letter-spacing: 2px;
  padding: 14px 10px;
  margin-bottom: 10px;
}
.countdown-display.done {
  background: #7f1d1d;
  color: #fee2e2;
}
@media (max-width: 700px) {
  body { padding: 10px; padding-top: 78px; }
  h1 { font-size: 1.5rem; }
  .field-row { flex-direction: column; }
  .field-row input, .field-row button { width: 100%; }
  .feature-card.fullscreen-feature {
    inset: 8px;
  }
  .topbar-right { width: 100%; justify-content: flex-start; }
  .tabs { width: 100%; overflow-x: auto; flex-wrap: nowrap; padding-bottom: 4px; }
  .tabs .tab { flex: 0 0 auto; }
  .nav-links { display: none; }
  #nav-toggle { display: flex; }
  .nav-brand-text span { display: none; }
}