@import url('https://fonts.googleapis.com/css2?family=Press+Start+2P&display=swap');

:root {
  --bg: #0a0a1a;
  --bg2: #111128;
  --bg3: #1a1a35;
  --green: #00ff41;
  --gold: #ffd700;
  --red: #ff2020;
  --blue: #00cfff;
  --purple: #b44fff;
  --text: #e0e0ff;
  --dim: #6060a0;
  --border: #333366;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Press Start 2P', monospace;
  font-size: 11px;
  line-height: 1.8;
  min-height: 100vh;
  image-rendering: pixelated;
}

/* ─── HUD ─────────────────────────────────────────────────────────────────── */
.hud {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 52px;
  background: var(--bg2);
  border-bottom: 3px solid var(--green);
  display: flex;
  align-items: center;
  padding: 0 16px;
  gap: 20px;
  z-index: 1000;
  box-shadow: 0 2px 0 #000, 0 4px 0 var(--green);
}

.hud-logo {
  color: var(--green);
  font-size: 9px;
  text-decoration: none;
  white-space: nowrap;
  text-shadow: 0 0 10px var(--green);
}

.hud-spacer { flex: 1; }

.hud-stat {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 8px;
  color: var(--dim);
}

.hud-stat span { color: var(--gold); }
.hud-stat.xp span { color: var(--green); }
.hud-stat.coins span { color: var(--gold); }
.hud-stat.lvl span { color: var(--blue); }

.xp-bar-wrap {
  display: flex;
  align-items: center;
  gap: 6px;
}

.xp-bar {
  width: 80px;
  height: 8px;
  background: var(--bg3);
  border: 2px solid var(--border);
  image-rendering: pixelated;
}

.xp-bar-fill {
  height: 100%;
  background: var(--green);
  transition: width 0.5s;
  box-shadow: 0 0 4px var(--green);
}

.hud-nav a {
  color: var(--dim);
  text-decoration: none;
  font-size: 7px;
  padding: 4px 6px;
  border: 2px solid transparent;
  transition: all 0.1s;
}

.hud-nav a:hover {
  color: var(--text);
  border-color: var(--border);
}

.hud-logout {
  background: none;
  border: 2px solid var(--border);
  color: var(--dim);
  font-family: 'Press Start 2P', monospace;
  font-size: 7px;
  padding: 4px 8px;
  cursor: pointer;
}
.hud-logout:hover { color: var(--red); border-color: var(--red); }

/* ─── Main container ─────────────────────────────────────────────────────── */
.main { padding-top: 64px; min-height: 100vh; }
.container { max-width: 1100px; margin: 0 auto; padding: 20px 16px; }

/* ─── Pixel box ──────────────────────────────────────────────────────────── */
.pixel-box {
  background: var(--bg2);
  border: 3px solid var(--border);
  padding: 16px;
  box-shadow: 3px 3px 0 #000;
  image-rendering: pixelated;
}

.pixel-box-green { border-color: var(--green); box-shadow: 3px 3px 0 #000, 0 0 12px rgba(0,255,65,0.15); }
.pixel-box-gold { border-color: var(--gold); box-shadow: 3px 3px 0 #000, 0 0 12px rgba(255,215,0,0.15); }
.pixel-box-red { border-color: var(--red); box-shadow: 3px 3px 0 #000; }

/* ─── Buttons ────────────────────────────────────────────────────────────── */
.btn {
  display: inline-block;
  font-family: 'Press Start 2P', monospace;
  font-size: 9px;
  padding: 10px 16px;
  cursor: pointer;
  text-decoration: none;
  border: none;
  image-rendering: pixelated;
  transition: transform 0.1s;
  box-shadow: 4px 4px 0 #000;
}

.btn:active { transform: translate(2px, 2px); box-shadow: 2px 2px 0 #000; }

.btn-green { background: var(--green); color: #000; }
.btn-gold { background: var(--gold); color: #000; }
.btn-outline {
  background: transparent;
  border: 2px solid var(--border);
  color: var(--text);
}
.btn-outline:hover { border-color: var(--green); color: var(--green); }
.btn-red { background: var(--red); color: #fff; }

/* ─── Input ──────────────────────────────────────────────────────────────── */
.pixel-input {
  width: 100%;
  background: var(--bg3);
  border: 2px solid var(--border);
  color: var(--text);
  font-family: 'Press Start 2P', monospace;
  font-size: 9px;
  padding: 10px 12px;
  outline: none;
  transition: border-color 0.2s;
}

.pixel-input:focus { border-color: var(--green); box-shadow: 0 0 8px rgba(0,255,65,0.2); }

/* ─── Blink cursor ───────────────────────────────────────────────────────── */
.blink { animation: blink 1s step-end infinite; }
@keyframes blink { 50% { opacity: 0; } }

/* ─── Typewriter ─────────────────────────────────────────────────────────── */
.typewriter {
  overflow: hidden;
  white-space: nowrap;
  animation: typewrite 2s steps(40) forwards;
}
@keyframes typewrite { from { width: 0; } to { width: 100%; } }

/* ─── Progress bar ───────────────────────────────────────────────────────── */
.progress-bar {
  width: 100%;
  height: 12px;
  background: var(--bg3);
  border: 2px solid var(--border);
}

.progress-fill {
  height: 100%;
  background: var(--green);
  box-shadow: 0 0 6px var(--green);
  transition: width 0.5s;
}

/* ─── Badge / Achievement ────────────────────────────────────────────────── */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  background: var(--bg3);
  border: 2px solid var(--border);
  font-size: 7px;
  color: var(--dim);
}

.badge.earned {
  border-color: var(--gold);
  color: var(--gold);
  box-shadow: 0 0 8px rgba(255,215,0,0.2);
}

/* ─── Page header ────────────────────────────────────────────────────────── */
.page-header {
  border-bottom: 2px solid var(--border);
  padding-bottom: 16px;
  margin-bottom: 24px;
}

.page-title {
  font-size: 14px;
  color: var(--green);
  text-shadow: 0 0 12px rgba(0,255,65,0.4);
  margin-bottom: 8px;
}

.page-sub { font-size: 8px; color: var(--dim); }

/* ─── Lesson card ────────────────────────────────────────────────────────── */
.lesson-card {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px;
  background: var(--bg2);
  border: 2px solid var(--border);
  text-decoration: none;
  color: var(--text);
  margin-bottom: 10px;
  transition: all 0.15s;
  box-shadow: 3px 3px 0 #000;
}

.lesson-card:hover { border-color: var(--green); transform: translate(-2px, -2px); box-shadow: 5px 5px 0 #000; }
.lesson-card.completed { border-color: #004400; }
.lesson-card.boss { border-color: var(--red); }
.lesson-card.boss:hover { border-color: #ff6060; }

.lesson-status {
  font-size: 16px;
  min-width: 24px;
  text-align: center;
}

.lesson-info { flex: 1; }
.lesson-title { font-size: 9px; margin-bottom: 4px; }
.lesson-meta { font-size: 7px; color: var(--dim); }
.lesson-xp { font-size: 7px; color: var(--green); }

/* ─── Leaderboard ────────────────────────────────────────────────────────── */
.lb-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  background: var(--bg2);
  border: 2px solid var(--border);
  margin-bottom: 8px;
  font-size: 8px;
}

.lb-row.me { border-color: var(--green); }
.lb-rank { color: var(--gold); min-width: 20px; }
.lb-name { flex: 1; }
.lb-xp { color: var(--green); }
.lb-lvl { color: var(--blue); min-width: 50px; text-align: right; }

/* ─── Auth forms ─────────────────────────────────────────────────────────── */
.auth-wrap {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  padding: 20px;
  background: radial-gradient(ellipse at center, #0f0f2a 0%, var(--bg) 70%);
}

.auth-box {
  width: 100%;
  max-width: 420px;
  background: var(--bg2);
  border: 3px solid var(--green);
  padding: 32px;
  box-shadow: 6px 6px 0 #000, 0 0 30px rgba(0,255,65,0.1);
}

.auth-title {
  font-size: 12px;
  color: var(--green);
  text-align: center;
  margin-bottom: 8px;
  text-shadow: 0 0 12px var(--green);
}

.auth-sub {
  font-size: 7px;
  color: var(--dim);
  text-align: center;
  margin-bottom: 24px;
}

.form-group { margin-bottom: 14px; }
.form-label { display: block; font-size: 7px; color: var(--dim); margin-bottom: 6px; }

.error-msg {
  background: rgba(255,32,32,0.1);
  border: 2px solid var(--red);
  color: var(--red);
  padding: 8px 12px;
  font-size: 7px;
  margin-bottom: 14px;
}

.auth-link { font-size: 7px; color: var(--dim); text-align: center; margin-top: 16px; }
.auth-link a { color: var(--green); text-decoration: none; }

/* ─── Lesson content ─────────────────────────────────────────────────────── */
.lesson-content {
  background: var(--bg2);
  border: 2px solid var(--border);
  padding: 24px;
  margin-bottom: 20px;
  line-height: 2;
}

.lesson-content h2 { font-size: 11px; color: var(--green); margin-bottom: 16px; }
.lesson-content h3 { font-size: 9px; color: var(--gold); margin: 16px 0 8px; }
.lesson-content p { font-size: 8px; color: var(--text); margin-bottom: 10px; }
.lesson-content ul, .lesson-content ol { padding-left: 20px; margin-bottom: 10px; }
.lesson-content li { font-size: 8px; margin-bottom: 6px; }
.lesson-content strong { color: var(--blue); }
.lesson-content em { color: var(--gold); font-style: normal; }
.lesson-content pre { background: #000; padding: 12px; font-size: 8px; color: var(--green); border: 1px solid var(--border); margin: 10px 0; overflow-x: auto; }
.lesson-content .pixel-box { font-size: 9px; color: var(--gold); text-align: center; margin: 12px 0; }

/* ─── Toast notification ─────────────────────────────────────────────────── */
.toast {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: var(--bg2);
  border: 3px solid var(--green);
  padding: 14px 18px;
  font-size: 8px;
  color: var(--green);
  z-index: 9999;
  box-shadow: 4px 4px 0 #000;
  animation: slideIn 0.3s ease, fadeOut 0.5s ease 3s forwards;
  max-width: 280px;
}

.toast.gold { border-color: var(--gold); color: var(--gold); }
.toast.red { border-color: var(--red); color: var(--red); }

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

/* ─── Scanlines effect ───────────────────────────────────────────────────── */
body::after {
  content: '';
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: repeating-linear-gradient(0deg, transparent, transparent 2px, rgba(0,0,0,0.03) 2px, rgba(0,0,0,0.03) 4px);
  pointer-events: none;
  z-index: 9998;
}

/* ─── Scrollbar ──────────────────────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border); }
::-webkit-scrollbar-thumb:hover { background: var(--green); }

/* ─── Responsive ─────────────────────────────────────────────────────────── */
@media (max-width: 600px) {
  .hud { flex-wrap: wrap; height: auto; padding: 8px; gap: 8px; }
  .main { padding-top: 80px; }
  body { font-size: 9px; }
  .page-title { font-size: 10px; }
}