/* Illuminate Drones — Visual Observer Training
   Mobile-first, dark "drone show at night" aesthetic with brand orange. */

:root {
  --bg: #0b0e14;
  --bg-2: #11151f;
  --card: #161b28;
  --card-2: #1b2130;
  --line: #2a3140;
  --ink: #eef2f8;
  --ink-2: #aab4c5;
  --mute: #7f8aa0;
  --orange: #e8650a;
  --orange-2: #ff8a3d;
  --amber: #ffb020;
  --good: #2fbf71;
  --bad: #f2555a;
  --radius: 18px;
  --shadow: 0 10px 40px rgba(0,0,0,.45);
  --maxw: 720px;
  --safe-b: env(safe-area-inset-bottom, 0px);
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
[hidden] { display: none !important; }
html, body { margin: 0; padding: 0; }
body {
  background:
    radial-gradient(1200px 600px at 50% -10%, #1a2340, transparent),
    radial-gradient(900px 500px at 100% 0%, rgba(232,101,10,.10), transparent),
    var(--bg);
  background-color: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  min-height: 100dvh;
}

img { max-width: 100%; display: block; }
button { font-family: inherit; cursor: pointer; }

/* ---------- Top bar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 40;
  display: flex; align-items: center; gap: 12px;
  padding: 10px 14px calc(10px);
  padding-top: max(10px, env(safe-area-inset-top));
  background: rgba(11,14,20,.82);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.topbar-logo { height: 26px; width: auto; }
.topbar-progress {
  flex: 1; height: 7px; border-radius: 99px;
  background: #232a3a; overflow: hidden;
}
.topbar-progress-fill {
  height: 100%; width: 0%;
  background: linear-gradient(90deg, var(--amber), var(--orange));
  border-radius: 99px; transition: width .4s ease;
}
.topbar-menu {
  background: transparent; border: 0; color: var(--ink);
  font-size: 20px; line-height: 1; padding: 6px 4px;
}

/* ---------- Layout ---------- */
.app { max-width: var(--maxw); margin: 0 auto; padding: 20px 16px calc(120px + var(--safe-b)); }
.screen { animation: fade .35s ease; }
@keyframes fade { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }

/* ---------- Welcome ---------- */
.hero { text-align: center; padding: 18px 4px 8px; }
.hero-logo { width: min(280px, 74%); margin: 8px auto 20px; filter: drop-shadow(0 8px 30px rgba(232,101,10,.35)); }
.hero h1 { font-size: clamp(26px, 7vw, 40px); line-height: 1.1; margin: 6px 0 8px; letter-spacing: -.02em; }
.hero .kicker {
  display: inline-block; font-size: 12px; letter-spacing: .16em; text-transform: uppercase;
  color: var(--amber); font-weight: 700; padding: 6px 12px; border: 1px solid rgba(255,176,32,.3);
  border-radius: 99px; margin-bottom: 14px; background: rgba(255,176,32,.06);
}
.hero p.lede { color: var(--ink-2); font-size: 16px; max-width: 44ch; margin: 0 auto 22px; }

.hero-nightsky {
  position: relative; height: 190px; margin: 6px auto 20px; max-width: 520px;
  border-radius: var(--radius); overflow: hidden; border: 1px solid var(--line);
}

.stats { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; margin: 18px 0 8px; }
.stat { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 12px 16px; min-width: 92px; }
.stat b { display: block; font-size: 22px; color: var(--orange-2); }
.stat span { font-size: 12px; color: var(--mute); }

.namecard {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 18px 16px; margin: 22px auto 0; max-width: 460px; box-shadow: var(--shadow);
}
.namecard label { display: block; text-align: left; font-size: 13px; color: var(--ink-2); margin: 0 0 6px; font-weight: 600; }
.field {
  width: 100%; background: var(--bg-2); border: 1px solid var(--line); color: var(--ink);
  border-radius: 12px; padding: 14px 14px; font-size: 16px; outline: none;
}
.field:focus { border-color: var(--orange); box-shadow: 0 0 0 3px rgba(232,101,10,.18); }
.field + .field { margin-top: 12px; }
.hint { font-size: 12px; color: var(--mute); text-align: left; margin: 8px 2px 0; }

/* ---------- Cards / lessons ---------- */
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 20px 18px; box-shadow: var(--shadow); margin-bottom: 16px;
}
.lesson-eyebrow { font-size: 12px; letter-spacing: .14em; text-transform: uppercase; color: var(--amber); font-weight: 700; }
.lesson-title { font-size: clamp(22px, 5.5vw, 30px); margin: 6px 0 4px; letter-spacing: -.01em; line-height: 1.12; }
.lesson-sub { color: var(--mute); font-size: 13px; margin-bottom: 16px; }
.lesson-art { margin: 6px 0 18px; }
.lesson-art svg { width: 100%; height: auto; display: block; border-radius: 14px; }
.lesson-body p { color: var(--ink-2); margin: 0 0 14px; }
.lesson-body strong { color: var(--ink); }

.keys { list-style: none; padding: 0; margin: 6px 0 4px; }
.keys li {
  position: relative; padding: 12px 14px 12px 46px; margin-bottom: 10px;
  background: var(--card-2); border: 1px solid var(--line); border-radius: 12px;
  color: var(--ink-2); font-size: 14.5px;
}
.keys li b { color: var(--ink); }
.keys li::before {
  content: ""; position: absolute; left: 14px; top: 50%; transform: translateY(-50%);
  width: 18px; height: 18px; border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, var(--orange-2), var(--orange));
  box-shadow: 0 0 12px rgba(255,138,61,.5);
}

.callout {
  border-left: 3px solid var(--amber); background: rgba(255,176,32,.07);
  border-radius: 10px; padding: 12px 14px; margin: 4px 0 6px; font-size: 14px; color: var(--ink-2);
}
.callout.reg { border-color: var(--orange); background: rgba(232,101,10,.08); }
.callout b { color: var(--ink); }
.callout .tag { display:inline-block; font-size:11px; font-weight:700; letter-spacing:.08em; text-transform:uppercase; color: var(--amber); margin-right:6px; }
.callout.reg .tag { color: var(--orange-2); }

/* ---------- Bottom action bar ---------- */
.actionbar {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 30;
  display: flex; gap: 10px; align-items: center;
  max-width: var(--maxw); margin: 0 auto;
  padding: 12px 16px calc(12px + var(--safe-b));
  background: linear-gradient(to top, var(--bg) 62%, transparent);
}
.btn {
  flex: 1; border: 0; border-radius: 14px; padding: 16px 18px; font-size: 16px; font-weight: 700;
  color: #fff; background: linear-gradient(135deg, var(--orange), var(--orange-2));
  box-shadow: 0 8px 24px rgba(232,101,10,.35); transition: transform .12s ease, filter .12s ease;
}
.btn:active { transform: translateY(1px) scale(.995); }
.btn:disabled { filter: grayscale(.6) brightness(.7); box-shadow: none; }
.btn.ghost { background: transparent; color: var(--ink-2); border: 1px solid var(--line); box-shadow: none; flex: 0 0 auto; padding: 16px 18px; }
.btn.wide { flex: 1; }

/* ---------- Quiz ---------- */
.quiz-count { font-size: 12px; letter-spacing: .12em; text-transform: uppercase; color: var(--amber); font-weight: 700; }
.quiz-q { font-size: clamp(19px, 4.8vw, 24px); margin: 8px 0 18px; line-height: 1.28; }
.opt {
  display: flex; align-items: center; gap: 12px; width: 100%; text-align: left;
  background: var(--card-2); border: 1.5px solid var(--line); color: var(--ink);
  border-radius: 14px; padding: 15px 15px; margin-bottom: 12px; font-size: 15.5px; line-height: 1.35;
  transition: border-color .12s ease, background .12s ease, transform .1s ease;
}
.opt:active { transform: scale(.99); }
.opt .dot {
  flex: 0 0 auto; width: 24px; height: 24px; border-radius: 50%;
  border: 2px solid var(--mute); display: grid; place-items: center; font-size: 13px; font-weight: 800; color: var(--mute);
}
.opt.sel { border-color: var(--orange); background: rgba(232,101,10,.10); }
.opt.sel .dot { border-color: var(--orange); background: var(--orange); color: #fff; }
.opt.correct { border-color: var(--good); background: rgba(47,191,113,.12); }
.opt.correct .dot { border-color: var(--good); background: var(--good); color: #fff; }
.opt.wrong { border-color: var(--bad); background: rgba(242,85,90,.12); }
.opt.wrong .dot { border-color: var(--bad); background: var(--bad); color: #fff; }
.opt[disabled] { opacity: 1; cursor: default; }

.feedback { border-radius: 12px; padding: 12px 14px; font-size: 14px; margin: 4px 0 2px; display: none; }
.feedback.show { display: block; animation: fade .25s ease; }
.feedback.ok { background: rgba(47,191,113,.12); border: 1px solid rgba(47,191,113,.4); color: #bff3d6; }
.feedback.no { background: rgba(242,85,90,.10); border: 1px solid rgba(242,85,90,.4); color: #ffd2d4; }
.feedback .src { display:block; margin-top:6px; color: var(--mute); font-size:12px; }

.dots { display: flex; gap: 7px; justify-content: center; margin: 2px 0 14px; }
.dots i { width: 9px; height: 9px; border-radius: 50%; background: #2a3140; display: inline-block; }
.dots i.done { background: var(--good); }
.dots i.cur { background: var(--orange); box-shadow: 0 0 10px rgba(232,101,10,.6); }

/* ---------- Results / certificate ---------- */
.result-hero { text-align: center; padding: 8px 0 4px; }
.result-badge { width: 120px; margin: 6px auto 14px; }
.result-hero h2 { font-size: clamp(24px, 6vw, 34px); margin: 4px 0; }
.result-hero p { color: var(--ink-2); }
.score-ring { font-size: 15px; color: var(--amber); font-weight: 700; }

.cert-wrap { margin: 10px 0 6px; border-radius: 14px; overflow: hidden; border: 1px solid var(--line); background:#fff; }
.cert-wrap svg { width: 100%; height: auto; display: block; }

.retry-list { margin: 6px 0 0; }
.status-line { text-align:center; font-size: 13px; color: var(--mute); margin: 10px 0 0; min-height: 18px; }
.status-line.good { color: #bff3d6; }
.status-line.warn { color: #ffd9a8; }

.spinner { width: 20px; height: 20px; border-radius: 50%; border: 3px solid rgba(255,255,255,.35); border-top-color:#fff; display:inline-block; vertical-align:-4px; margin-right:8px; animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- Lesson menu ---------- */
.lesson-menu {
  position: fixed; top: 0; right: 0; bottom: 0; z-index: 60; width: min(320px, 86vw);
  background: var(--bg-2); border-left: 1px solid var(--line); box-shadow: var(--shadow);
  transform: translateX(100%); transition: transform .28s ease; overflow-y: auto;
  padding: max(14px, env(safe-area-inset-top)) 14px 24px;
}
.lesson-menu.open { transform: none; }
.lesson-menu-head { display: flex; justify-content: space-between; align-items: center; font-weight: 700; margin-bottom: 10px; }
.lesson-menu-head button { background: transparent; border: 0; color: var(--ink-2); font-size: 18px; }
.lesson-menu ol { list-style: none; counter-reset: l; padding: 0; margin: 0; }
.lesson-menu li {
  counter-increment: l; display: flex; align-items: center; gap: 12px;
  padding: 12px 10px; border-radius: 10px; color: var(--ink-2); font-size: 14.5px;
}
.lesson-menu li::before {
  content: counter(l); flex: 0 0 auto; width: 26px; height: 26px; border-radius: 50%;
  background: #232a3a; color: var(--mute); display: grid; place-items: center; font-size: 12px; font-weight: 700;
}
.lesson-menu li.done::before { background: var(--good); color: #06210f; content: "✓"; }
.lesson-menu li.cur { background: var(--card); color: var(--ink); }
.lesson-menu li.cur::before { background: var(--orange); color: #fff; }
.lesson-menu li.locked { opacity: .5; }

.scrim { position: fixed; inset: 0; z-index: 55; background: rgba(0,0,0,.5); }

/* small screens */
@media (max-width: 380px) {
  .stat { min-width: 78px; padding: 10px 12px; }
  .app { padding-left: 12px; padding-right: 12px; }
}