/* ===== Base ===== */
:root {
  color-scheme: dark;
}

body {
  font-feature-settings: 'tnum' on;
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.08); border-radius: 10px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.15); }

/* ===== Nav Tabs ===== */
.nav-tab {
  padding: 0.5rem 1rem;
  border-radius: 9999px;
  font-size: 0.875rem;
  color: #94a3b8;
  transition: all 0.2s;
  position: relative;
}
.nav-tab:hover { color: white; }
.nav-tab.active {
  background: linear-gradient(135deg, #00e5ff 0%, #b388ff 100%);
  color: #0a0e1a;
  font-weight: 600;
  box-shadow: 0 4px 20px rgba(179, 136, 255, 0.3);
}

/* ===== Language Pill Selector ===== */
.lang-pill {
  padding: 0.35rem 0.7rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  color: #94a3b8;
  transition: all 0.2s;
  font-weight: 500;
}
.lang-pill:hover { color: white; }
.lang-pill.active {
  background: linear-gradient(135deg, #ffd54a 0%, #ff4fb1 100%);
  color: #0a0e1a;
  font-weight: 700;
  box-shadow: 0 2px 10px rgba(255, 79, 177, 0.3);
}

/* ===== Multi-lang code tabs in lessons ===== */
.lang-tabs {
  display: flex;
  gap: 0.3rem;
  margin-bottom: -1px;
}
.lang-tab-btn {
  padding: 0.35rem 0.8rem;
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.08);
  border-bottom: none;
  border-radius: 0.4rem 0.4rem 0 0;
  font-size: 0.78rem;
  color: #94a3b8;
  cursor: pointer;
  transition: all 0.15s;
  font-family: 'JetBrains Mono', monospace;
}
.lang-tab-btn:hover { color: #fff; background: rgba(255,255,255,0.06); }
.lang-tab-btn.active {
  background: #0a0e1a;
  border-color: rgba(179, 136, 255, 0.35);
  color: #b388ff;
  font-weight: 600;
}
.lang-tab-panel { display: none; }
.lang-tab-panel.active { display: block; }
.lang-tab-panel > .code-block { border-top-left-radius: 0; }

/* ===== Stars background ===== */
.stars {
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(1px 1px at 10% 20%, rgba(255,255,255,0.6), transparent),
    radial-gradient(1px 1px at 30% 70%, rgba(255,255,255,0.4), transparent),
    radial-gradient(2px 2px at 60% 30%, rgba(179,136,255,0.6), transparent),
    radial-gradient(1px 1px at 80% 80%, rgba(0,229,255,0.5), transparent),
    radial-gradient(1px 1px at 90% 10%, rgba(255,255,255,0.4), transparent),
    radial-gradient(2px 2px at 45% 50%, rgba(255,79,177,0.5), transparent),
    radial-gradient(1px 1px at 15% 90%, rgba(255,255,255,0.5), transparent),
    radial-gradient(1px 1px at 70% 60%, rgba(255,213,74,0.5), transparent);
  background-size: 200% 200%;
  animation: drift 60s linear infinite;
  opacity: 0.6;
}

@keyframes drift {
  from { background-position: 0% 0%; }
  to { background-position: 100% 100%; }
}

@keyframes float {
  0%, 100% { transform: translateY(0) translateX(0); }
  50% { transform: translateY(-30px) translateX(20px); }
}

@keyframes glow {
  from { box-shadow: 0 0 20px rgba(0,229,255,0.3); }
  to { box-shadow: 0 0 40px rgba(179,136,255,0.5); }
}

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

/* ===== Glass card ===== */
.glass {
  background: rgba(18, 24, 39, 0.6);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 1rem;
}

.glass-hover {
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
.glass-hover:hover {
  transform: translateY(-4px);
  border-color: rgba(179, 136, 255, 0.4);
  box-shadow: 0 20px 60px rgba(179, 136, 255, 0.15);
}

/* ===== Landing hero ===== */
.hero-title {
  background: linear-gradient(135deg, #00e5ff 0%, #b388ff 50%, #ff4fb1 100%);
  background-size: 200% 200%;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: shimmer 6s linear infinite;
}

/* ===== Mode cards ===== */
.mode-card {
  position: relative;
  overflow: hidden;
  cursor: pointer;
}
.mode-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--card-color-1, #00e5ff) 0%, var(--card-color-2, #b388ff) 100%);
  opacity: 0.08;
  transition: opacity 0.3s;
}
.mode-card:hover::before { opacity: 0.15; }
.mode-card .shine {
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(45deg, transparent 30%, rgba(255,255,255,0.1) 50%, transparent 70%);
  transform: translateX(-100%);
  transition: transform 0.6s;
}
.mode-card:hover .shine { transform: translateX(100%); }

/* ===== Quest world map ===== */
.quest-node {
  cursor: pointer;
  transition: all 0.3s;
}
.quest-node:hover { transform: scale(1.1); }
.quest-node.locked { opacity: 0.4; cursor: not-allowed; filter: grayscale(0.8); }
.quest-node.completed .node-ring { stroke: #52ffa8; }
.quest-node.current .node-ring { stroke: #ffd54a; animation: pulse-ring 2s ease-out infinite; }

@keyframes pulse-ring {
  0% { stroke-width: 3; opacity: 1; }
  100% { stroke-width: 12; opacity: 0; }
}

/* ===== XP bar ===== */
.xp-bar {
  height: 10px;
  background: rgba(255,255,255,0.08);
  border-radius: 9999px;
  overflow: hidden;
  position: relative;
}
.xp-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, #00e5ff 0%, #b388ff 50%, #ff4fb1 100%);
  background-size: 200% 100%;
  animation: shimmer 2s linear infinite;
  transition: width 0.8s cubic-bezier(0.4, 0, 0.2, 1);
  border-radius: 9999px;
}

/* ===== Toast ===== */
.toast {
  padding: 0.75rem 1rem;
  border-radius: 0.75rem;
  background: rgba(18, 24, 39, 0.95);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255,255,255,0.1);
  box-shadow: 0 10px 40px rgba(0,0,0,0.5);
  min-width: 240px;
  font-size: 0.875rem;
  animation: slideInRight 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  pointer-events: auto;
}
.toast.success { border-left: 4px solid #52ffa8; }
.toast.info { border-left: 4px solid #00e5ff; }
.toast.warn { border-left: 4px solid #ffd54a; }
.toast.error { border-left: 4px solid #ff4fb1; }

@keyframes slideInRight {
  from { transform: translateX(120%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

/* ===== XP burst ===== */
.xp-burst {
  position: fixed;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  font-size: 4rem;
  font-weight: 800;
  background: linear-gradient(135deg, #ffd54a, #ff4fb1);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  pointer-events: none;
  z-index: 1000;
  text-shadow: 0 0 40px rgba(255, 213, 74, 0.6);
}

/* ===== Tier badges ===== */
.tier-A1 { background: linear-gradient(135deg, #52ffa8, #00e5ff); color: #0a0e1a; }
.tier-A2 { background: linear-gradient(135deg, #00e5ff, #b388ff); color: #0a0e1a; }
.tier-A3 { background: linear-gradient(135deg, #b388ff, #ff4fb1); color: #0a0e1a; }

/* ===== Monaco editor container ===== */
#codeEditor { background: #1e1e1e; }
#codeEditor .monaco-editor { padding-top: 8px; }

/* ===== Laser visualizer ===== */
.laser-svg {
  background: linear-gradient(180deg, #0a0e1a 0%, #121827 100%);
  border-radius: 12px;
  border: 1px solid rgba(255,255,255,0.08);
}

/* ===== Difficulty dots ===== */
.difficulty-dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: rgba(255,255,255,0.2);
  margin: 0 1px;
}
.difficulty-dot.active { background: #ffd54a; box-shadow: 0 0 8px rgba(255,213,74,0.6); }

/* ===== Arena timer ===== */
.arena-timer {
  font-variant-numeric: tabular-nums;
  font-family: 'JetBrains Mono', monospace;
}
.arena-timer.warning { color: #ffd54a; animation: pulse-warn 1s ease-in-out infinite; }
.arena-timer.danger { color: #ff4fb1; animation: pulse-warn 0.5s ease-in-out infinite; }

@keyframes pulse-warn {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

/* ===== Code result badge ===== */
.result-pass {
  background: rgba(82, 255, 168, 0.15);
  color: #52ffa8;
  border: 1px solid rgba(82, 255, 168, 0.3);
}
.result-fail {
  background: rgba(255, 79, 177, 0.15);
  color: #ff4fb1;
  border: 1px solid rgba(255, 79, 177, 0.3);
}

/* ===== Level up animation ===== */
@keyframes levelUpExplode {
  0% { transform: translate(-50%, -50%) scale(0.3); opacity: 0; }
  20% { transform: translate(-50%, -50%) scale(1.2); opacity: 1; }
  80% { transform: translate(-50%, -50%) scale(1); opacity: 1; }
  100% { transform: translate(-50%, -50%) scale(1.5); opacity: 0; }
}
.level-up-banner {
  animation: levelUpExplode 2.5s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

/* ===== Prose ===== */
.prose-toi {
  line-height: 1.7;
}
.prose-toi h3 { font-size: 1rem; font-weight: 600; margin-top: 1rem; margin-bottom: 0.5rem; color: #b388ff; }
.prose-toi code { background: rgba(0,0,0,0.4); padding: 0.1rem 0.3rem; border-radius: 0.25rem; font-family: 'JetBrains Mono', monospace; font-size: 0.85em; color: #00e5ff; }
.prose-toi pre { background: #000; padding: 0.8rem; border-radius: 0.5rem; overflow-x: auto; font-family: 'JetBrains Mono', monospace; font-size: 0.85em; margin: 0.5rem 0; }
.prose-toi table { width: 100%; border-collapse: collapse; margin: 0.5rem 0; font-size: 0.85em; }
.prose-toi th, .prose-toi td { border: 1px solid rgba(255,255,255,0.08); padding: 0.4rem 0.6rem; text-align: left; vertical-align: top; }
.prose-toi th { background: rgba(179,136,255,0.1); font-weight: 600; }

/* ===== Confetti ===== */
.confetti {
  position: fixed;
  width: 10px;
  height: 10px;
  pointer-events: none;
  z-index: 999;
}