:root {
  --bg-dark: #100f2e;
  --bg-darker: #0a0920;
  --purple: #7b2ff7;
  --pink: #f72585;
  --cyan: #00e5ff;
  --yellow: #ffd60a;
  --green: #2ec27e;
  --red: #ff4d6d;
  --white: #f5f4ff;
  --card-bg: rgba(255,255,255,0.06);
  --card-border: rgba(255,255,255,0.14);
  --radius: 18px;
  --shadow-glow: 0 0 30px rgba(123,47,247,0.35);
  font-size: 16px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0; padding: 0; height: 100%;
  font-family: 'Poppins', 'Segoe UI', system-ui, -apple-system, sans-serif;
  color: var(--white);
  background: radial-gradient(circle at 20% 10%, #2a1b6b 0%, var(--bg-dark) 45%, var(--bg-darker) 100%);
  overflow-x: hidden;
  -webkit-tap-highlight-color: transparent;
}

#app { min-height: 100vh; display: flex; flex-direction: column; }

.stars-bg {
  position: fixed; inset: 0; z-index: -1;
  background-image:
    radial-gradient(1px 1px at 20% 30%, #fff 100%, transparent),
    radial-gradient(1px 1px at 60% 70%, #fff 100%, transparent),
    radial-gradient(2px 2px at 80% 20%, #fff 100%, transparent),
    radial-gradient(1px 1px at 40% 85%, #fff 100%, transparent),
    radial-gradient(1px 1px at 90% 55%, #fff 100%, transparent),
    radial-gradient(2px 2px at 10% 65%, #fff 100%, transparent);
  background-repeat: repeat;
  background-size: 400px 400px;
  opacity: 0.5;
  animation: drift 60s linear infinite;
}
@keyframes drift { from { background-position: 0 0; } to { background-position: -400px 400px; } }

.center-screen {
  flex: 1; display: flex; align-items: center; justify-content: center; padding: 24px;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  backdrop-filter: blur(14px);
  box-shadow: var(--shadow-glow);
  padding: 32px;
  width: 100%;
  max-width: 420px;
}

.brand {
  text-align: center; margin-bottom: 20px;
}
.brand .logo {
  font-size: 56px; line-height: 1; display: inline-block;
  animation: bounce 2.2s ease-in-out infinite;
  filter: drop-shadow(0 0 12px var(--pink));
}
@keyframes bounce { 0%,100% { transform: translateY(0) rotate(-4deg); } 50% { transform: translateY(-10px) rotate(4deg); } }
.brand h1 {
  font-size: 28px; margin: 8px 0 2px;
  background: linear-gradient(90deg, var(--cyan), var(--pink), var(--yellow));
  -webkit-background-clip: text; background-clip: text; color: transparent;
  font-weight: 800; letter-spacing: 0.5px;
}
.brand p { margin: 0; opacity: 0.75; font-size: 14px; }

.tabs { display: flex; gap: 8px; margin-bottom: 18px; }
.tab-btn {
  flex: 1; padding: 10px; border-radius: 12px; border: 1px solid var(--card-border);
  background: transparent; color: var(--white); font-weight: 600; cursor: pointer;
  font-size: 14px; transition: all 0.2s;
}
.tab-btn.active { background: linear-gradient(90deg, var(--purple), var(--pink)); border-color: transparent; box-shadow: 0 4px 14px rgba(247,37,133,0.4); }

label { display: block; font-size: 13px; opacity: 0.85; margin: 12px 0 6px; font-weight: 600; }
input[type=text], input[type=password] {
  width: 100%; padding: 12px 14px; border-radius: 12px; border: 1px solid var(--card-border);
  background: rgba(255,255,255,0.08); color: var(--white); font-size: 16px; outline: none;
  transition: border-color 0.2s;
}
input[type=text]:focus, input[type=password]:focus { border-color: var(--cyan); }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 20px; border-radius: 14px; border: none; cursor: pointer;
  font-weight: 700; font-size: 15px; color: white; letter-spacing: 0.3px;
  background: linear-gradient(90deg, var(--purple), var(--pink));
  box-shadow: 0 6px 18px rgba(247,37,133,0.35);
  transition: transform 0.12s ease, box-shadow 0.12s ease;
  width: 100%; margin-top: 18px;
}
.btn:active { transform: scale(0.97); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn.secondary { background: rgba(255,255,255,0.1); box-shadow: none; border: 1px solid var(--card-border); }
.btn.small { width: auto; padding: 8px 14px; font-size: 13px; margin-top: 0; }
.btn.danger { background: linear-gradient(90deg, #ff4d6d, #c9184a); }

.error-msg { color: var(--red); font-size: 13px; margin-top: 10px; min-height: 16px; }
.hint { font-size: 12px; opacity: 0.6; margin-top: 14px; text-align: center; }

/* App shell (post-login) */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 20px; background: rgba(10,9,32,0.7); backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--card-border); position: sticky; top: 0; z-index: 10;
}
.topbar .who { display: flex; align-items: center; gap: 10px; font-weight: 700; }
.topbar .avatar { font-size: 26px; }
.topbar nav { display: flex; gap: 6px; }
.topbar nav button {
  background: transparent; border: none; color: var(--white); opacity: 0.65;
  font-weight: 600; font-size: 13px; padding: 8px 12px; border-radius: 10px; cursor: pointer;
}
.topbar nav button.active { opacity: 1; background: rgba(255,255,255,0.1); }
.topbar .logout { background: none; border: none; color: var(--white); opacity: 0.6; cursor: pointer; font-size: 20px; }

main.content { flex: 1; padding: 20px; max-width: 900px; margin: 0 auto; width: 100%; }

.section-title { font-size: 20px; font-weight: 800; margin: 6px 0 16px; }

.level-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 14px; }
.level-card {
  background: var(--card-bg); border: 1px solid var(--card-border); border-radius: 16px;
  padding: 16px; text-align: center; cursor: pointer; transition: transform 0.15s;
  position: relative;
}
.level-card:hover:not(.locked) { transform: translateY(-4px); }
.level-card.locked { opacity: 0.45; cursor: not-allowed; }
.level-card .num { font-size: 30px; font-weight: 900; color: var(--cyan); }
.level-card .name { font-weight: 700; font-size: 14px; margin: 4px 0; }
.level-card .desc { font-size: 11px; opacity: 0.65; min-height: 30px; }
.level-card .stars { font-size: 16px; letter-spacing: 2px; margin-top: 6px; }
.level-card .lock-icon { font-size: 28px; margin-top: 8px; }
.level-card .passed-badge { position: absolute; top: 8px; right: 10px; font-size: 16px; }

/* Game screen */
.game-wrap { display: flex; flex-direction: column; align-items: center; gap: 20px; padding-top: 10px; }
.hud { display: flex; gap: 14px; width: 100%; max-width: 480px; justify-content: space-between; font-size: 13px; font-weight: 700; }
.hud .pill { background: rgba(255,255,255,0.08); border-radius: 20px; padding: 6px 14px; }
.progress-bar-outer { width: 100%; max-width: 480px; height: 10px; background: rgba(255,255,255,0.1); border-radius: 6px; overflow: hidden; }
.progress-bar-inner { height: 100%; background: linear-gradient(90deg, var(--cyan), var(--green)); transition: width 0.3s; }

.question-card {
  background: var(--card-bg); border: 1px solid var(--card-border); border-radius: 24px;
  padding: 40px 24px; width: 100%; max-width: 480px; text-align: center;
  box-shadow: var(--shadow-glow);
}
.question-text { font-size: 34px; font-weight: 900; letter-spacing: 1px; margin-bottom: 24px; word-break: break-word; }
.answer-form { display: flex; gap: 10px; align-items: center; justify-content: center; }
.answer-form input {
  width: 140px; text-align: center; font-size: 24px; font-weight: 800; padding: 12px; border-radius: 14px;
  border: 2px solid var(--card-border); background: rgba(255,255,255,0.08); color: var(--white);
}
.answer-form input:focus { outline: none; border-color: var(--cyan); }
.keypad { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; max-width: 260px; margin: 18px auto 0; }
.keypad button {
  padding: 14px 0; font-size: 18px; font-weight: 800; border-radius: 12px; border: 1px solid var(--card-border);
  background: rgba(255,255,255,0.08); color: var(--white); cursor: pointer;
}
.keypad button:active { background: rgba(255,255,255,0.2); }

.feedback-flash { position: fixed; inset: 0; pointer-events: none; z-index: 50; opacity: 0; transition: opacity 0.15s; }
.feedback-flash.correct { background: rgba(46,194,126,0.25); opacity: 1; }
.feedback-flash.wrong { background: rgba(255,77,109,0.25); opacity: 1; }

.result-card { text-align: center; }
.result-card .big-emoji { font-size: 64px; }
.result-card .score { font-size: 40px; font-weight: 900; color: var(--yellow); margin: 6px 0; }
.stat-row { display: flex; justify-content: space-around; margin: 18px 0; }
.stat-row .stat { text-align: center; }
.stat-row .stat .v { font-size: 20px; font-weight: 800; }
.stat-row .stat .l { font-size: 11px; opacity: 0.65; }
.award-toast { background: rgba(255,214,10,0.15); border: 1px solid var(--yellow); border-radius: 14px; padding: 10px 14px; margin: 8px 0; display: flex; align-items: center; gap: 10px; }

/* Leaderboard */
.lb-row { display: flex; align-items: center; gap: 14px; padding: 12px 14px; border-radius: 14px; margin-bottom: 8px; background: var(--card-bg); border: 1px solid var(--card-border); }
.lb-row .rank { font-weight: 900; font-size: 18px; width: 28px; text-align: center; }
.lb-row.rank-1 .rank { color: var(--yellow); }
.lb-row.rank-2 .rank { color: #d0d0e0; }
.lb-row.rank-3 .rank { color: #e0a06e; }
.lb-row .avatar { font-size: 24px; }
.lb-row .name { flex: 1; font-weight: 700; }
.lb-row .score { font-weight: 800; color: var(--cyan); }
.lb-filter { display: flex; gap: 6px; margin-bottom: 14px; flex-wrap: wrap; }
.lb-filter button { padding: 6px 12px; border-radius: 10px; border: 1px solid var(--card-border); background: transparent; color: var(--white); font-size: 12px; cursor: pointer; }
.lb-filter button.active { background: var(--purple); }

/* Awards */
.awards-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 14px; }
.award-card { background: var(--card-bg); border: 1px solid var(--card-border); border-radius: 16px; padding: 16px; text-align: center; }
.award-card.locked { opacity: 0.35; filter: grayscale(1); }
.award-card .icon { font-size: 36px; }
.award-card .name { font-weight: 700; font-size: 13px; margin: 6px 0 2px; }
.award-card .desc { font-size: 11px; opacity: 0.6; }

/* Admin */
.admin-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.admin-table th, .admin-table td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--card-border); }
.admin-table th { opacity: 0.7; font-size: 11px; text-transform: uppercase; letter-spacing: 0.5px; }
.admin-table tr:hover { background: rgba(255,255,255,0.04); cursor: pointer; }
.stat-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px,1fr)); gap: 12px; margin-bottom: 20px; }
.stat-card { background: var(--card-bg); border: 1px solid var(--card-border); border-radius: 14px; padding: 16px; text-align: center; }
.stat-card .v { font-size: 26px; font-weight: 900; color: var(--cyan); }
.stat-card .l { font-size: 11px; opacity: 0.65; margin-top: 4px; }
.back-link { background: none; border: none; color: var(--cyan); cursor: pointer; font-weight: 700; font-size: 13px; margin-bottom: 14px; }
.bar-row { display: flex; align-items: center; gap: 10px; margin-bottom: 8px; font-size: 13px; }
.bar-row .label { width: 140px; flex-shrink: 0; }
.bar-outer { flex: 1; height: 10px; background: rgba(255,255,255,0.08); border-radius: 6px; overflow: hidden; }
.bar-inner { height: 100%; background: linear-gradient(90deg, var(--cyan), var(--green)); }

.toolbar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 14px; flex-wrap: wrap; gap: 10px; }
.pill-link { text-decoration: none; }

@media (max-width: 480px) {
  .question-text { font-size: 26px; }
  main.content { padding: 14px; }
  .topbar { padding: 10px 12px; }
  .topbar nav button { padding: 6px 8px; font-size: 12px; }
}