/* 808 React — dark theme, React cyan accent, mobile-first */
:root {
  --bg: #0b1120;
  --bg2: #111a2e;
  --card: #16213a;
  --card2: #1c2947;
  --line: #263453;
  --txt: #e8eefb;
  --mut: #8fa0c2;
  --acc: #61dafb;
  --acc-d: #21a1c4;
  --good: #34d399;
  --bad: #f87171;
  --warn: #fbbf24;
  --r: 14px;
}
* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
body {
  margin: 0; background: var(--bg); color: var(--txt);
  font-family: "Pyidaungsu", "Noto Sans Myanmar", system-ui, -apple-system, sans-serif;
  line-height: 1.65; padding-bottom: 84px;
}
a { color: var(--acc); text-decoration: none; }
.wrap { max-width: 720px; margin: 0 auto; padding: 16px; }
.topbar {
  position: sticky; top: 0; z-index: 20;
  background: rgba(11,17,32,.92); backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.topbar .wrap { display: flex; align-items: center; gap: 10px; padding-top: 12px; padding-bottom: 12px; }
.logo { font-size: 22px; font-weight: 800; }
.logo span { color: var(--acc); }
.streak-pill {
  margin-left: auto; background: var(--card); border: 1px solid var(--line);
  border-radius: 999px; padding: 4px 12px; font-size: 13px; color: var(--warn);
}
.xp-pill {
  background: var(--card); border: 1px solid var(--line);
  border-radius: 999px; padding: 4px 12px; font-size: 13px; color: var(--acc);
}
.card {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--r); padding: 16px; margin-bottom: 12px;
}
h1 { font-size: 22px; margin: 6px 0 12px; }
h2 { font-size: 17px; margin: 18px 0 8px; }
h3 { font-size: 15px; margin: 0 0 8px; }
.mut { color: var(--mut); } .small { font-size: 13px; }
.btn {
  display: inline-block; border: 0; cursor: pointer; font: inherit; font-weight: 700;
  background: var(--acc); color: #06283a; border-radius: 12px; padding: 12px 20px;
}
.btn:active { transform: scale(.97); }
.btn.ghost { background: var(--card2); color: var(--txt); border: 1px solid var(--line); }
.btn.block { display: block; width: 100%; text-align: center; }
.btn:disabled { opacity: .45; cursor: default; }
.progress { height: 10px; background: var(--bg2); border-radius: 999px; overflow: hidden; }
.progress > div { height: 100%; background: linear-gradient(90deg, var(--acc-d), var(--acc)); border-radius: 999px; transition: width .4s; }
.mod-head { display: flex; align-items: center; gap: 10px; margin: 20px 0 8px; }
.mod-num {
  width: 34px; height: 34px; border-radius: 10px; flex: 0 0 34px;
  background: var(--card2); border: 1px solid var(--line);
  display: flex; align-items: center; justify-content: center; font-weight: 800; color: var(--acc);
}
.lesson {
  display: flex; gap: 12px; align-items: center; padding: 13px 14px;
  background: var(--card); border: 1px solid var(--line); border-radius: var(--r);
  margin-bottom: 8px; color: var(--txt);
}
.lesson .dot {
  width: 30px; height: 30px; border-radius: 50%; flex: 0 0 30px;
  border: 2px solid var(--line); display: flex; align-items: center; justify-content: center; font-size: 14px;
}
.lesson.done .dot { background: var(--good); border-color: var(--good); color: #052e1f; }
.lesson .t { flex: 1; } .lesson .t b { display: block; font-size: 15px; }
.lesson .t span { font-size: 12px; color: var(--mut); }
.lesson.next { border-color: var(--acc); box-shadow: 0 0 0 1px var(--acc); }
/* lesson player */
.pbar { height: 8px; background: var(--bg2); border-radius: 999px; overflow: hidden; margin: 12px 0; }
.pbar > div { height: 100%; background: linear-gradient(90deg, var(--acc-d), var(--acc)); transition: width .3s; }
.step-body { font-size: 16px; }
.step-body strong { color: var(--acc); }
pre.code {
  background: #0a0f1e; border: 1px solid var(--line); border-radius: 10px;
  padding: 12px; overflow-x: auto; font-size: 13.5px; line-height: 1.55;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}
pre.code .hl { background: rgba(97,218,251,.15); display: block; margin: 0 -12px; padding: 0 12px; }
.note { font-size: 13px; color: var(--mut); border-left: 3px solid var(--acc); padding-left: 10px; margin: 8px 0; }
.opt {
  display: block; width: 100%; text-align: left; margin-bottom: 8px;
  background: var(--card); border: 1px solid var(--line); color: var(--txt);
  border-radius: 12px; padding: 13px 14px; font: inherit; cursor: pointer;
}
.opt.right { border-color: var(--good); background: rgba(52,211,153,.12); }
.opt.wrong { border-color: var(--bad); background: rgba(248,113,113,.12); }
.opt:disabled { cursor: default; }
.fill-line { display: flex; gap: 8px; margin-bottom: 8px; align-items: center; }
.fill-line input {
  flex: 1; background: #0a0f1e; border: 1px solid var(--acc); color: var(--txt);
  border-radius: 8px; padding: 8px 10px; font: inherit; font-family: ui-monospace, monospace;
}
textarea.code-input {
  width: 100%; min-height: 220px; background: #0a0f1e; color: var(--txt);
  border: 1px solid var(--line); border-radius: 10px; padding: 12px;
  font-family: ui-monospace, Menlo, monospace; font-size: 13.5px; line-height: 1.55;
}
iframe.preview { width: 100%; min-height: 260px; background: #fff; border: 1px solid var(--line); border-radius: 10px; }
.console-log { background: #0a0f1e; border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; font-size: 13px; font-family: ui-monospace, monospace; max-height: 150px; overflow-y: auto; }
.console-log .err { color: var(--bad); } .console-log .ok { color: var(--good); }
/* toast */
#toast {
  position: fixed; left: 50%; bottom: 96px; transform: translateX(-50%) translateY(20px);
  background: var(--card2); border: 1px solid var(--acc); color: var(--txt);
  padding: 10px 18px; border-radius: 999px; font-weight: 700; opacity: 0;
  transition: all .25s; z-index: 99; pointer-events: none; white-space: nowrap;
}
#toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
/* bottom nav */
.nav {
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 30;
  background: rgba(11,17,32,.96); border-top: 1px solid var(--line);
  display: flex; padding: 8px 4px calc(8px + env(safe-area-inset-bottom));
}
.nav a { flex: 1; text-align: center; color: var(--mut); font-size: 11px; padding: 4px; }
.nav a .i { font-size: 21px; display: block; }
.nav a.on { color: var(--acc); }
/* auth */
.field { margin-bottom: 12px; }
.field label { display: block; font-size: 13px; color: var(--mut); margin-bottom: 4px; }
.field input {
  width: 100%; background: #0a0f1e; border: 1px solid var(--line); color: var(--txt);
  border-radius: 10px; padding: 12px; font: inherit;
}
/* stats */
.stat-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.stat { background: var(--card); border: 1px solid var(--line); border-radius: var(--r); padding: 14px; text-align: center; }
.stat b { font-size: 24px; display: block; color: var(--acc); }
.stat span { font-size: 12px; color: var(--mut); }
.hero {
  text-align: center; padding: 34px 16px 22px;
  background: radial-gradient(600px 220px at 50% 0%, rgba(97,218,251,.14), transparent);
  border-radius: 0 0 24px 24px;
}
.hero .big { font-size: 46px; }
.badge { display: inline-block; background: var(--card2); border: 1px solid var(--line); border-radius: 999px; padding: 3px 10px; font-size: 12px; color: var(--mut); margin: 2px; }