@import url("../brand-dark2.css?v=dark2-20260919-01");
:root{--navy:#071b2b;--blue:#0b4e73;--cyan:#29d3c2;--gold:#f1c86a;--paper:#f4f7fa;--ink:#102333;--muted:#637383;--line:#dfe7ed;--success:#138a62;--danger:#b43a4b}*{box-sizing:border-box}body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,Segoe UI,sans-serif;background:var(--paper);color:var(--ink)}button,textarea{font:inherit}.topbar{height:76px;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 32px;position:sticky;top:0;z-index:10}.brand{display:flex;gap:12px;align-items:center;color:var(--ink);text-decoration:none}.brand-mark{width:42px;height:42px;border-radius:50%;display:grid;place-items:center;background:linear-gradient(145deg,var(--gold),#fff0a6);color:var(--navy);font-weight:900;box-shadow:0 0 0 4px var(--navy)}.brand strong,.student strong{display:block}.brand small,.student small{display:block;color:var(--muted)}.student{display:flex;gap:10px;align-items:center}.status-dot{width:10px;height:10px;border-radius:50%;background:var(--cyan);box-shadow:0 0 0 4px #d9faf6}.layout{min-height:calc(100vh - 76px);display:grid;grid-template-columns:300px 1fr}.sidebar{background:var(--navy);color:#fff;padding:30px 24px}.eyebrow{text-transform:uppercase;letter-spacing:.14em;font-size:.7rem;font-weight:800;color:#218a98;margin:0 0 6px}.sidebar .eyebrow{color:var(--cyan)}.sidebar h1{font-size:1.35rem;margin:0 0 28px}.progress-label{display:flex;justify-content:space-between;font-size:.8rem}.progress{height:8px;background:#183b50;border-radius:10px;margin:8px 0 28px;overflow:hidden}.progress span{display:block;width:0;height:100%;background:linear-gradient(90deg,var(--gold),var(--cyan));transition:.4s}.phases{display:grid;gap:10px}.phase{width:100%;display:flex;gap:12px;text-align:left;border:1px solid #24495e;border-radius:14px;padding:12px;background:#0b2639;color:#fff}.phase>span{width:32px;height:32px;border-radius:9px;display:grid;place-items:center;background:#173e54;font-weight:800}.phase strong,.phase small{display:block}.phase small{color:#91a8b7;margin-top:3px}.phase.active{border-color:var(--cyan);box-shadow:0 0 0 1px var(--cyan) inset}.phase.active>span{background:var(--cyan);color:var(--navy)}.phase.locked{opacity:.58}.level-card{margin-top:28px;border:1px solid #274b60;border-radius:16px;padding:16px;background:linear-gradient(145deg,#0d2b40,#102538)}.level-card span,.level-card small,.level-card strong{display:block}.level-card span,.level-card small{color:#9ab0bd;font-size:.8rem}.level-card strong{color:var(--gold);margin:5px 0}.classroom{padding:32px;max-width:1050px;width:100%;margin:auto}.hero{background:linear-gradient(130deg,var(--navy),var(--blue));color:#fff;border-radius:22px;padding:28px 32px;display:flex;justify-content:space-between;gap:24px;box-shadow:0 16px 38px #0b35501c}.hero h2{font-size:2rem;margin:4px 0 10px}.hero p{max-width:650px;color:#c8d7df}.score{min-width:150px;border:1px solid #ffffff2c;border-radius:16px;padding:16px;text-align:center;background:#ffffff0c}.score span,.score small,.score strong{display:block}.score strong{font-size:2rem;color:var(--gold)}.score small{color:#c5d5df}.card{background:#fff;border:1px solid var(--line);border-radius:20px;padding:24px;margin-top:20px;box-shadow:0 8px 24px #1732480a}.card-title{display:flex;align-items:center;gap:12px}.card-title h3{margin:0}.icon{width:42px;height:42px;border-radius:12px;background:#e7f6f5;display:grid;place-items:center;color:#08776e;font-weight:900}.icon.code{background:#eaf0ff;color:#264f9f}.concepts{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:18px}.concepts div{border:1px solid var(--line);padding:14px;border-radius:12px}.concepts span,.concepts strong{display:block}.concepts span{font-size:.75rem;color:var(--muted);margin-bottom:4px}label{display:block;font-size:.8rem;font-weight:800;margin:18px 0 8px}textarea{width:100%;min-height:170px;resize:vertical;border:1px solid #263b49;border-radius:14px;padding:18px;background:#091821;color:#dff7ee;font-family:ui-monospace,SFMono-Regular,Consolas,monospace;line-height:1.55}.lab-actions{display:flex;gap:10px;margin-top:14px}button{cursor:pointer}.primary,.secondary,.next{border:0;border-radius:12px;padding:12px 17px;font-weight:800}.primary{background:var(--navy);color:#fff}.secondary{background:#e8eff3;color:var(--ink)}.feedback{display:grid;gap:4px;margin-top:16px;padding:14px 16px;border-radius:12px}.feedback.neutral{background:#edf4f7}.feedback.success{background:#e3f8ef;color:#086b4b}.feedback.error{background:#fdebed;color:#8c2736}.requirements ul{list-style:none;padding:0;display:grid;gap:10px}.requirements li{display:flex;gap:10px;align-items:center;color:var(--muted)}.requirements li span{width:20px;height:20px;border:2px solid #b9c6cf;border-radius:50%}.requirements li.done{color:var(--success);font-weight:700}.requirements li.done span{background:var(--success);border-color:var(--success);box-shadow:inset 0 0 0 4px #fff}.next{width:100%;background:#dce4e9;color:#7b8992}.next.unlocked{background:linear-gradient(90deg,var(--cyan),#64df9a);color:var(--navy)}@media(max-width:800px){.topbar{padding:0 16px}.student{display:none}.layout{grid-template-columns:1fr}.sidebar{padding:22px}.classroom{padding:18px}.hero{display:block}.score{margin-top:18px}.concepts{grid-template-columns:1fr}.lab-actions{display:grid}}
.theory-steps{display:grid;gap:10px;margin-top:18px}.theory-steps>div{display:flex;gap:12px;align-items:flex-start;padding:12px 14px;background:#f7fafb;border-radius:12px}.theory-steps span{flex:0 0 28px;height:28px;border-radius:50%;display:grid;place-items:center;background:var(--navy);color:#fff;font-weight:800}.theory-steps p{margin:3px 0}.example-box,.instruction-box{margin-top:16px;border-radius:14px;padding:16px}.example-box{border:1px solid #cfe6e3;background:#f0fbf9}.example-box>code{display:block;background:var(--navy);color:#e9fff9;padding:13px;border-radius:9px;margin:8px 0}.example-box p:last-child,.instruction-box p{margin-bottom:0}.instruction-box{background:#fff7dd;border:1px solid #efd994}.instruction-box strong{color:#71520a}.instruction-box code{background:#fff;padding:2px 6px;border-radius:5px}

.code-explainer{margin-top:18px;border-top:1px solid var(--line);padding-top:20px}.code-explainer h4{margin:2px 0 14px;font-size:1.05rem}.command-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.command-list>div{border:1px solid var(--line);border-radius:12px;padding:13px;background:#fbfcfd}.command-list>div>code{display:inline-block;background:#e8f3f5;color:#075c69;padding:4px 8px;border-radius:7px;font-weight:800}.command-list p{margin:8px 0 0;color:var(--muted);font-size:.9rem;line-height:1.45}.command-list p code{color:var(--ink)}.translated-code{margin-top:12px;padding:15px;border-left:4px solid var(--cyan);background:#edf9f7;border-radius:0 12px 12px 0}.translated-code>code{font-weight:800;color:#075c69}.translated-code p{margin:8px 0 0}@media(max-width:650px){.command-list{grid-template-columns:1fr}}

.checkpoint{margin-top:20px;padding:18px;border-radius:16px;background:#f7f9ff;border:1px solid #dce4f3}
.checkpoint h4{margin:2px 0 6px}
.checkpoint>p:not(.eyebrow){margin-top:0;color:var(--muted)}
.question{border:0;padding:0;margin:18px 0 0}
.question legend{font-weight:800;margin-bottom:9px}
.answer-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}
.answer-grid button{min-height:46px;border:1px solid #cad6df;background:#fff;border-radius:10px;padding:9px;color:var(--ink)}
.answer-grid button:hover{border-color:var(--blue);background:#f2f8fb}
.answer-grid button.correct{border-color:var(--success);background:#e3f8ef;color:#086b4b;font-weight:800}
.answer-grid button.incorrect{border-color:var(--danger);background:#fdebed;color:#8c2736}
.question-feedback{min-height:20px;margin:7px 0 0;font-size:.86rem}
.question-feedback.ok{color:var(--success);font-weight:700}
.question-feedback.try{color:var(--danger)}
.checkpoint-status{margin-top:16px;padding:11px;border-radius:10px;text-align:center;background:#e8eef3;font-weight:800}
.checkpoint-status.complete{background:#daf7eb;color:#086b4b}
.primary:disabled{cursor:not-allowed;opacity:.58}
@media(max-width:700px){.answer-grid{grid-template-columns:1fr}}

/* ===== Reusable interactive lesson engine ===== */
.interactive-shell{min-height:calc(100vh - 76px);display:grid;grid-template-columns:300px 1fr}
.interactive-sidebar{background:var(--navy);color:#fff;padding:26px 24px;position:sticky;top:76px;height:calc(100vh - 76px);overflow:auto}
.interactive-sidebar .eyebrow{color:var(--cyan)}
.interactive-sidebar h1{font-size:1.32rem;margin:0 0 24px}
.academy-back-inline{display:inline-flex;margin-bottom:20px;color:#b9ceda;text-decoration:none;font-size:.82rem;font-weight:800}
.academy-back-inline:hover{color:#fff}
.lesson-loading{min-height:420px;display:grid;place-items:center;text-align:center;color:var(--muted)}
.lesson-loading strong{display:block;font-size:1.3rem;margin-bottom:8px}
.lesson-loading a{display:inline-block;text-decoration:none;margin-top:12px}
.concepts small{display:block;margin-top:5px;color:var(--muted);line-height:1.4}
.academy-code-example{margin:12px 0 0;padding:16px 18px;border-radius:14px;background:#081923;color:#dff7ee;overflow:auto;line-height:1.55}
.academy-code-example code{font-family:ui-monospace,SFMono-Regular,Consolas,monospace;white-space:pre}
.academy-console{margin-top:14px;padding:13px 15px;border-radius:12px;background:#06141d;color:#d9f5eb}
.academy-console strong{display:block;color:var(--cyan);font-size:.78rem;text-transform:uppercase;letter-spacing:.08em}
.academy-console pre{margin:8px 0 0;white-space:pre-wrap;font: .84rem/1.5 ui-monospace,SFMono-Regular,Consolas,monospace}
.structured-practice{margin-top:15px;padding:17px;border:1px solid #d9e4eb;border-radius:14px;background:#f7fafc}
.structured-practice strong{display:block;margin-bottom:6px}
.structured-practice p{margin:0;color:var(--muted);line-height:1.6}
.mastery-note{margin:18px 0;padding:14px;border-left:4px solid var(--cyan);background:#edf9f7;border-radius:0 12px 12px 0}
.mastery-note strong{display:block;color:#075c69}.mastery-note p{margin:5px 0 0;color:var(--muted)}
.lesson-buttons button.lesson-locked{opacity:.72;cursor:pointer;background:#f5f6f8}
.lesson-buttons button.lesson-locked:hover{border-color:#b9c8d3}
@media(max-width:800px){.interactive-shell{grid-template-columns:1fr}.interactive-sidebar{position:static;height:auto}.interactive-sidebar .phases{grid-template-columns:1fr 1fr}.interactive-sidebar .level-card{margin-top:18px}}
@media(max-width:520px){.interactive-sidebar .phases{grid-template-columns:1fr}}


/* ===== Academy level checkout ===== */
.academy-buy,.academy-buy-card{margin-top:12px;border:0;border-radius:12px;background:linear-gradient(135deg,#087a91,#0d506f);color:#fff;padding:11px 14px;font:800 .9rem/1.2 inherit;cursor:pointer;box-shadow:0 10px 24px rgba(7,88,107,.18);transition:transform .18s ease,box-shadow .18s ease,opacity .18s ease}
.academy-buy:hover,.academy-buy-card:hover{transform:translateY(-2px);box-shadow:0 14px 30px rgba(7,88,107,.25)}
.academy-buy:disabled,.academy-buy-card:disabled{opacity:.6;cursor:wait;transform:none}
.academy-buy-card{width:100%}
.level-card-row.locked .lesson-buttons{margin-bottom:10px}


/* ===== Academy learning progress ===== */
.academy-level-progress{margin:12px 0 14px;padding:11px 12px;border:1px solid var(--line);border-radius:12px;background:#f8fbfc}
.academy-level-progress>div:first-child{display:flex;align-items:center;justify-content:space-between;gap:12px;font-size:.76rem}
.academy-level-progress span,.academy-level-progress small{color:var(--muted)}
.academy-level-progress strong{color:var(--ink)}
.academy-level-progressbar{height:7px;margin:8px 0 5px;border-radius:999px;background:#e1e9ee;overflow:hidden}
.academy-level-progressbar i{display:block;height:100%;border-radius:inherit;background:linear-gradient(90deg,var(--cyan),#6adf99);transition:width .35s ease}


/* ===== Academy launch offer anchoring ===== */
.academy-price-anchor{display:flex;align-items:baseline;gap:10px;flex-wrap:wrap;margin:14px 0 4px}
.academy-price-anchor del{color:#8a98a3;font-size:.9rem}
.academy-price-anchor strong{font-size:1.45rem;color:#0b6e62}
.academy-price-anchor small{flex-basis:100%;color:var(--muted);font-size:.76rem}
.academy-price-anchor.compact{padding:10px 12px;border:1px solid #d9ebe6;border-radius:12px;background:#f3fbf8}
.academy-price-anchor.compact strong{font-size:1.2rem}


/* ===== Academy lab sandbox notice ===== */
.lab-sandbox-note{
  display:flex;
  gap:8px;
  align-items:flex-start;
  margin-top:10px;
  padding:11px 13px;
  border:1px solid rgba(14,126,140,.22);
  border-radius:11px;
  background:rgba(17,151,163,.07);
  color:var(--muted);
  font-size:.76rem;
  line-height:1.45
}
.lab-sandbox-note strong{color:#08776e;white-space:nowrap}
.lab-sandbox-note span{min-width:0}
@media(max-width:560px){
  .lab-sandbox-note{display:grid;gap:3px}
}