/* ============ Math with Norwent — styles ============ */

/* Activation banner on free topics (code from teacher / Norwent Kontrol) */
.free-banner{display:flex;align-items:center;justify-content:center;gap:12px;flex-wrap:wrap;background:linear-gradient(120deg,rgba(139,92,246,.16),rgba(34,211,238,.10));border:1px solid #26346b;border-left:4px solid #8b5cf6;border-radius:14px;padding:12px 16px;margin:0 0 18px;font-size:14px;color:var(--muted)}
.free-banner>span:first-child{flex:1;min-width:250px}
.free-banner b{color:var(--txt)}
.fb-ar{display:block;font-size:12.5px;color:var(--accent);margin-top:3px}
.fb-actions{display:flex;align-items:center;gap:8px}
.fb-btn{padding:7px 14px!important;font-size:13.5px!important;border-radius:10px!important}
.fb-x{background:none;border:0;color:var(--muted);font-size:15px;cursor:pointer;padding:4px 6px;border-radius:6px}
.fb-x:hover{color:var(--txt);background:rgba(255,255,255,.06)}

/* Free tryout quota (9 free exercises per FREE topic) */
.tryout-hint{background:rgba(34,211,238,.08);border:1px solid var(--line);border-radius:10px;padding:8px 14px;font-size:13.5px;color:var(--muted);margin-bottom:14px;text-align:center}
.tryout-hint b{color:var(--accent)}
.used-tag{opacity:.7;text-decoration:none}

/* Full lessons: key ideas, worked examples (details = CSP-safe), pitfalls */
.lesson-full .lesson-intro{font-size:15.5px;line-height:1.55;color:var(--txt);margin:4px 0 16px}
.keys{background:var(--card);border:1px solid var(--line);border-left:4px solid var(--accent);border-radius:12px;padding:12px 18px 12px 16px;margin:0 0 18px}
.keys h4,.pitfalls h4{margin:0 0 8px;font-size:14px;letter-spacing:.3px}
.keys ul,.pitfalls ul{margin:0;padding-left:20px;line-height:1.65;font-size:14.5px;color:var(--muted)}
.we-title{font-weight:700;margin:6px 0 10px;font-size:15px;color:var(--txt)}
.we-list{margin:0 0 20px;padding-left:22px;list-style:decimal}
.we-list>li{margin-bottom:10px}
.we{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:10px 14px}
.we summary{cursor:pointer;font-weight:600;font-size:14.5px;color:var(--txt);list-style:none}
.we summary::-webkit-details-marker{display:none}
.we summary::before{content:'▸ ';color:var(--accent);font-weight:700}
.we[open] summary::before{content:'▾ '}
.we-steps{margin:10px 0 8px;padding-left:22px;font-size:14px;color:var(--muted);line-height:1.6}
.we-a{margin-top:6px;font-weight:700;color:#8ef0b9;font-size:14.5px}
.pitfalls{background:rgba(251,191,36,.07);border:1px solid #5b4b16;border-left:4px solid var(--gold);border-radius:12px;padding:12px 18px 12px 16px;margin:0 0 8px}
/* Brand colours sampled from academy.norwent.com:
   violet #8b5cf6 · indigo #6366f1 · cyan #22d3ee · gold #fbbf24
   dark navy #101a36 / #131b38 */

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

:root {
  --bg: #101a36;
  --bg2: #131b38;
  --card: rgba(255, 255, 255, 0.05);
  --card-border: rgba(255, 255, 255, 0.11);
  --text: #e9edf8;
  --muted: #97a1c9;
  --violet: #8b5cf6;
  --indigo: #6366f1;
  --cyan: #22d3ee;
  --accent: #fbbf24;
  --good: #34d399;
  --bad: #fb7185;
  --brand: linear-gradient(120deg, #8b5cf6 0%, #6366f1 45%, #22d3ee 100%);
}

body {
  font-family: "Segoe UI", Tahoma, "Geeza Pro", "Helvetica Neue", Arial, sans-serif;
  background:
    radial-gradient(1100px 650px at 85% -10%, rgba(99, 102, 241, 0.28) 0%, transparent 60%),
    radial-gradient(900px 600px at -10% 25%, rgba(34, 211, 238, 0.14) 0%, transparent 55%),
    radial-gradient(700px 500px at 50% 110%, rgba(139, 92, 246, 0.16) 0%, transparent 55%),
    var(--bg);
  color: var(--text);
  min-height: 100vh;
}

/* ---- header ---- */
header {
  display: flex; align-items: center; gap: 16px; flex-wrap: wrap;
  padding: 14px 28px; position: sticky; top: 0; z-index: 20;
  background: rgba(16, 26, 54, 0.88); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--card-border);
}
.logo { font-size: 22px; font-weight: 800; letter-spacing: 0.5px; text-decoration: none; color: var(--text); }
.logo span { background: var(--brand); -webkit-background-clip: text; background-clip: text; color: transparent; }
.logo small { font-size: 11px; color: var(--muted); display: block; font-weight: 600; letter-spacing: 2px; text-transform: uppercase; }
nav { display: flex; gap: 4px; margin-left: auto; flex-wrap: wrap; align-items: center; }
nav a {
  color: var(--muted); text-decoration: none; padding: 8px 13px;
  border-radius: 999px; font-weight: 600; font-size: 14px;
}
nav a:hover { color: var(--text); background: var(--card); }
#counters { display: flex; gap: 8px; }
.counter {
  background: var(--card); border: 1px solid var(--card-border); border-radius: 999px;
  padding: 6px 12px; font-size: 13.5px; font-weight: 700; white-space: nowrap;
}
.counter.fire { color: #fdba74; border-color: rgba(251, 146, 60, .35); }
.counter.xp { color: var(--accent); border-color: rgba(251, 191, 36, .35); }

main { max-width: 1000px; margin: 0 auto; padding: 28px 20px 80px; }

/* ---- hero ---- */
.hero { text-align: center; padding: 44px 10px 34px; }
.coming {
  display: inline-block; background: var(--brand); color: #fff; font-weight: 800; font-size: 13px;
  padding: 6px 18px; border-radius: 999px; letter-spacing: 1px; margin-bottom: 18px;
  box-shadow: 0 6px 24px rgba(99, 102, 241, 0.5);
}
.hero h1 { font-size: clamp(30px, 6vw, 54px); font-weight: 900; line-height: 1.15; }
.hero h1 .grad {
  background: var(--brand);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero p { color: var(--muted); font-size: 17px; margin-top: 14px; max-width: 600px; margin-inline: auto; }
.hero .ar-sub { font-size: 19px; color: #c4b5fd; }
.badges { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; margin-top: 20px; }
.badge {
  background: var(--card); border: 1px solid var(--card-border);
  padding: 7px 14px; border-radius: 999px; font-size: 13.5px; color: var(--text);
}

.namebar { display: flex; gap: 10px; justify-content: center; margin-top: 24px; flex-wrap: wrap; }
.namebar input {
  background: var(--card); border: 1px solid var(--card-border); color: var(--text);
  padding: 10px 16px; border-radius: 999px; font-size: 15px; min-width: 220px; outline: none;
}
.namebar input:focus { border-color: var(--violet); }

/* ---- method cards (Norwent landing style) ---- */
.method {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 14px;
  margin: 36px 0 8px;
}
.method-card {
  background: var(--card); border: 1px solid var(--card-border); border-radius: 18px; padding: 20px;
}
.method-card .m-emoji { font-size: 28px; }
.method-card h4 { margin: 10px 0 6px; font-size: 16px; }
.method-card p { color: var(--muted); font-size: 13.5px; line-height: 1.5; }

/* ---- grade grid ---- */
.section-title { font-size: 22px; margin: 34px 0 16px; text-align: center; }
.grade-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 16px;
}
.grade-card {
  background: var(--card); border: 1px solid var(--card-border); border-radius: 18px;
  padding: 20px; text-decoration: none; color: var(--text); transition: transform .15s, border-color .15s;
  position: relative; overflow: hidden;
}
.grade-card:hover { transform: translateY(-4px); border-color: var(--gc, var(--violet)); }
.grade-card .emoji { font-size: 34px; }
.grade-card h3 { margin-top: 8px; font-size: 19px; }
.grade-card .sub { color: var(--muted); font-size: 13px; margin-top: 4px; }
.grade-card .stars { margin-top: 10px; font-size: 14px; color: var(--accent); }
.grade-card .rec {
  position: absolute; top: 12px; right: 12px; background: var(--brand); color: #fff;
  font-size: 11px; font-weight: 800; padding: 4px 10px; border-radius: 999px;
}
.grade-card::after {
  content: ''; position: absolute; inset: auto -30% -60% auto; width: 120px; height: 120px;
  background: var(--gc, var(--violet)); opacity: .13; border-radius: 50%;
}

/* ---- topic cards ---- */
.back { color: var(--muted); text-decoration: none; font-size: 14px; }
.back:hover { color: var(--text); }
.page-head { margin: 18px 0 22px; display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap; }
.page-head h2 { font-size: 28px; }
.page-head .hint { color: var(--muted); font-size: 14px; }
.topic-list { display: grid; gap: 14px; }
.topic-card {
  display: flex; align-items: center; gap: 16px;
  background: var(--card); border: 1px solid var(--card-border); border-radius: 16px;
  padding: 16px 20px; text-decoration: none; color: var(--text); transition: border-color .15s, transform .15s;
}
.topic-card:hover { border-color: var(--cyan); transform: translateX(4px); }
.topic-card .icon { font-size: 30px; }
.topic-card .info { flex: 1; }
.topic-card .info h3 { font-size: 17px; }
.topic-card .info .meta { color: var(--muted); font-size: 13px; margin-top: 3px; }
.topic-card .stars { color: var(--accent); font-size: 14px; white-space: nowrap; }

/* ---- topic page / tabs ---- */
.tabs { display: flex; gap: 8px; margin: 18px 0; }
.tabs button {
  background: var(--card); color: var(--muted); border: 1px solid var(--card-border);
  padding: 10px 22px; border-radius: 999px; font-size: 15px; font-weight: 700; cursor: pointer;
}
.tabs button.active { background: var(--brand); color: #fff; border-color: transparent; }

/* ---- lesson ---- */
.lesson {
  background: var(--card); border: 1px solid var(--card-border);
  border-radius: 18px; padding: 26px; font-size: 17px; line-height: 1.7;
}
.lesson .ex {
  background: rgba(99, 102, 241, 0.13); border-left: 4px solid var(--indigo);
  padding: 12px 16px; border-radius: 0 12px 12px 0; margin: 14px 0;
}
.lesson .remember {
  background: rgba(251, 191, 36, 0.09); border-left: 4px solid var(--accent);
  padding: 12px 16px; border-radius: 0 12px 12px 0; margin: 14px 0;
}
.words { margin-top: 22px; }
.words h4 { color: var(--muted); font-size: 14px; margin-bottom: 8px; text-transform: uppercase; letter-spacing: 1px; }
.words table { width: 100%; border-collapse: collapse; background: var(--card); border-radius: 12px; overflow: hidden; }
.words td, .words th { padding: 8px 14px; text-align: left; border-bottom: 1px solid var(--card-border); font-size: 15px; }
.words th { color: var(--muted); font-size: 13px; text-transform: uppercase; letter-spacing: 1px; }
.words td:nth-child(2) { color: var(--muted); font-style: italic; }
.words td[lang="ar"] { color: #c4b5fd; font-size: 16.5px; }

/* ---- practice ---- */
.practice-wrap { max-width: 640px; margin: 0 auto; }
.stats-row { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 16px; }
.stat {
  background: var(--card); border: 1px solid var(--card-border); border-radius: 12px;
  padding: 8px 16px; font-size: 14px;
}
.stat b { font-size: 16px; }
.qcard {
  background: var(--card); border: 1px solid var(--card-border); border-radius: 20px;
  padding: 34px 28px; text-align: center; animation: pop .25s ease;
}
@keyframes pop { from { transform: scale(.96); opacity: 0; } to { transform: scale(1); opacity: 1; } }
.qcard .q { font-size: clamp(20px, 4.5vw, 28px); line-height: 1.5; }
.qcard .muted { color: var(--muted); font-size: 15px; font-weight: 400; }
.qcard .level { color: var(--muted); font-size: 13px; margin-bottom: 12px; }

.answer-row { display: flex; gap: 10px; justify-content: center; margin-top: 24px; flex-wrap: wrap; }
.answer-row input {
  font-size: 22px; text-align: center; padding: 12px 18px; width: 200px;
  border-radius: 14px; border: 2px solid var(--card-border);
  background: rgba(0,0,0,.25); color: var(--text); outline: none;
}
.answer-row input:focus { border-color: var(--violet); }

.options { display: grid; gap: 12px; margin-top: 24px; }
.options button {
  font-size: 22px; padding: 16px; border-radius: 14px; cursor: pointer;
  background: rgba(0,0,0,.25); border: 2px solid var(--card-border); color: var(--text);
}
.options button:hover { border-color: var(--cyan); }
.options button.right { border-color: var(--good); background: rgba(52, 211, 153, 0.16); }
.options button.wrong { border-color: var(--bad); background: rgba(251, 113, 133, 0.14); }

.btn {
  font-size: 17px; font-weight: 800; padding: 12px 28px; border-radius: 14px;
  border: none; cursor: pointer; background: var(--brand); color: #fff;
  box-shadow: 0 8px 24px rgba(99, 102, 241, 0.35);
}
.btn:hover { filter: brightness(1.1); }
.btn.ghost { background: var(--card); color: var(--text); border: 1px solid var(--card-border); box-shadow: none; }
.btn.danger { background: linear-gradient(120deg, #f43f5e, #fb7185); }

.feedback { margin-top: 22px; font-size: 17px; min-height: 30px; }
.feedback.good { color: var(--good); }
.feedback.bad { color: var(--bad); }
.explain {
  margin-top: 12px; background: rgba(99, 102, 241, 0.1); border-radius: 12px;
  padding: 12px 16px; font-size: 15.5px; color: var(--text); text-align: left;
}
.explain b { color: var(--accent); }
.tip { color: var(--muted); font-size: 13px; margin-top: 18px; }

/* ---- challenge ---- */
.challenge-pick { display: grid; grid-template-columns: repeat(auto-fill, minmax(140px,1fr)); gap: 12px; }
.challenge-pick button {
  background: var(--card); border: 1px solid var(--card-border); color: var(--text);
  border-radius: 14px; padding: 18px; font-size: 16px; cursor: pointer; font-weight: 700;
  transition: border-color .15s, transform .15s;
}
.challenge-pick button:hover { border-color: var(--cyan); transform: translateY(-2px); }
.challenge-pick .best { display: block; color: var(--accent); font-size: 13px; margin-top: 6px; }
.timer-bar { height: 8px; background: var(--card-border); border-radius: 99px; overflow: hidden; margin: 14px 0 20px; }
.timer-bar div { height: 100%; background: var(--brand); transition: width .3s linear; }

/* ---- progress ---- */
.progress-block { margin-bottom: 26px; }
.progress-block h3 { margin-bottom: 10px; }
.progress-table { width: 100%; border-collapse: collapse; background: var(--card); border-radius: 14px; overflow: hidden; }
.progress-table th, .progress-table td { padding: 10px 14px; text-align: left; border-bottom: 1px solid var(--card-border); font-size: 14.5px; }
.progress-table th { color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: 1px; }
.progress-table td:last-child, .progress-table th:last-child { text-align: right; }

/* ---- toast ---- */
#toast {
  position: fixed; bottom: 28px; left: 50%; transform: translateX(-50%) translateY(20px);
  background: #1b2450; border: 1px solid var(--violet); color: var(--text);
  padding: 12px 26px; border-radius: 999px; font-weight: 700; font-size: 16px;
  opacity: 0; pointer-events: none; transition: all .3s ease; z-index: 50;
  box-shadow: 0 10px 30px rgba(0,0,0,.45);
}
#toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ---- premium / paywall ---- */
.veil {
  position: fixed; inset: 0; z-index: 100; display: flex; align-items: center; justify-content: center;
  background: rgba(8, 11, 28, 0.72); backdrop-filter: blur(8px); animation: veilIn .2s ease; padding: 20px;
}
@keyframes veilIn { from { opacity: 0; } to { opacity: 1; } }
.paywall {
  background: linear-gradient(160deg, #1b2450, #131b38); border: 1.5px solid var(--violet);
  border-radius: 22px; padding: 30px 28px; max-width: 440px; width: 100%;
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.55), 0 0 0 6px rgba(139, 92, 246, 0.12);
  position: relative; animation: pop .3s ease;
}
.pw-close {
  position: absolute; top: 14px; right: 14px; background: var(--card); border: 1px solid var(--card-border);
  color: var(--muted); width: 32px; height: 32px; border-radius: 50%; cursor: pointer; font-size: 14px;
}
.pw-close:hover { color: var(--text); }
.pw-title {
  font-size: 24px; font-weight: 900; margin-bottom: 14px;
  background: var(--brand); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.paywall p { color: var(--muted); font-size: 15px; line-height: 1.6; margin-bottom: 12px; }
.paywall p b { color: var(--text); }
.pw-ar { color: #c4b5fd; font-size: 16.5px; }
.code-row { display: flex; gap: 10px; margin: 16px 0 8px; flex-wrap: wrap; }
.code-row input {
  flex: 1; min-width: 160px; font-size: 18px; text-align: center; letter-spacing: 2px;
  padding: 12px 14px; border-radius: 14px; border: 2px solid var(--card-border);
  background: rgba(0, 0, 0, 0.3); color: var(--text); outline: none; text-transform: uppercase;
}
.code-row input:focus { border-color: var(--violet); }
.pw-err { color: var(--bad); font-size: 14.5px; min-height: 22px; font-weight: 700; }
.pw-note { font-size: 12.5px; margin-top: 10px; }
.pw-note b { color: var(--accent); }

.topic-card.locked { opacity: 0.82; cursor: pointer; }
.topic-card.locked:hover { border-color: #fb7185; transform: translateX(4px); }
.lock-badge { color: #fb7185 !important; font-weight: 800; white-space: nowrap; }
.free-tag {
  background: linear-gradient(120deg, #10b981, #22d3ee); color: #fff; font-size: 10px; font-weight: 900;
  padding: 3px 8px; border-radius: 999px; vertical-align: middle; letter-spacing: 1px;
}
.free-badge { border-color: rgba(52, 211, 153, .5); color: #6ee7b7; font-weight: 700; }

.premium-chip { cursor: pointer; font-family: inherit; color: var(--accent); border-color: rgba(251, 191, 36, .4); }
.premium-chip.on {
  background: linear-gradient(120deg, rgba(251, 191, 36, .18), rgba(251, 113, 133, .12));
  border-color: var(--accent); box-shadow: 0 0 12px rgba(251, 191, 36, .25);
}

/* ---- footer ---- */
footer { text-align: center; color: var(--muted); font-size: 13px; padding: 30px 20px 40px; }
footer a { color: #c4b5fd; text-decoration: none; }
footer a:hover { text-decoration: underline; }

@media (max-width: 560px) {
  .qcard { padding: 24px 16px; }
  .answer-row input { width: 150px; }
}