:root {
  --bg: #080c18;
  --panel: #0d1426;
  --panel-2: #111a31;
  --panel-3: #16203a;
  --text: #f5f7ff;
  --muted: #97a3bd;
  --line: #25314f;
  --accent: #67e8f9;
  --accent-2: #a78bfa;
  --success: #5ee0a0;
  --warning: #ffd166;
  --danger: #ff6b8a;
  --shadow: 0 24px 70px rgba(0,0,0,.34);
  --radius: 22px;
}

[data-theme="light"] {
  --bg: #eef2f8;
  --panel: #ffffff;
  --panel-2: #f7f9fc;
  --panel-3: #eaf0f8;
  --text: #111827;
  --muted: #5f6b80;
  --line: #d9e1ee;
  --accent: #0284c7;
  --accent-2: #7c3aed;
  --success: #12845a;
  --warning: #c57a00;
  --danger: #c92f56;
  --shadow: 0 22px 55px rgba(35,48,75,.14);
}

* { box-sizing: border-box; }
html { min-height: 100%; background: var(--bg); }
body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 80% -10%, color-mix(in srgb, var(--accent-2) 18%, transparent), transparent 36%),
    radial-gradient(circle at 5% 85%, color-mix(in srgb, var(--accent) 11%, transparent), transparent 28%),
    var(--bg);
}
button, input, select { font: inherit; }
button { cursor: pointer; }
button:focus-visible, input:focus-visible, select:focus-visible { outline: 3px solid color-mix(in srgb, var(--accent) 50%, transparent); outline-offset: 2px; }

.splash-seen .splash-screen { display:none; }
.splash-screen[hidden] { display:none; }
.splash-screen {
  position:fixed; inset:0; z-index:1000; display:grid; place-items:center; overflow:auto;
  padding:clamp(18px,4vw,54px); color:#f5f7ff;
  background:
    radial-gradient(circle at 15% 15%,rgba(103,232,249,.18),transparent 30%),
    radial-gradient(circle at 85% 80%,rgba(167,139,250,.22),transparent 34%),
    #070b16;
  transition:opacity .38s ease,transform .38s ease;
}
.splash-screen.leaving { opacity:0; transform:scale(1.02); pointer-events:none; }
.splash-card {
  position:relative; z-index:2; width:min(1120px,100%); min-height:min(650px,88vh);
  display:grid; grid-template-columns:minmax(0,1.05fr) minmax(390px,.95fr); overflow:hidden;
  border:1px solid rgba(255,255,255,.14); border-radius:32px;
  background:linear-gradient(145deg,rgba(17,26,49,.96),rgba(9,14,28,.97));
  box-shadow:0 40px 120px rgba(0,0,0,.56),0 0 80px rgba(103,232,249,.08);
}
.splash-visual { min-height:420px; display:flex; flex-direction:column; align-items:center; justify-content:center; padding:clamp(28px,5vw,64px); background:linear-gradient(155deg,#fff,#eaf4ff); }
.splash-visual img { width:100%; max-width:610px; height:auto; display:block; filter:drop-shadow(0 20px 36px rgba(28,92,150,.18)); }
.splash-visual p { margin:28px 0 0; color:#526176; font-size:11px; font-weight:900; letter-spacing:.22em; text-align:center; }
.splash-copy { display:flex; flex-direction:column; justify-content:center; padding:clamp(30px,5vw,66px); }
.language-choice { align-self:flex-end; display:inline-flex; gap:4px; margin-bottom:22px; padding:4px; border:1px solid rgba(255,255,255,.13); border-radius:999px; background:rgba(255,255,255,.05); }
.language-btn { border:0; border-radius:999px; padding:8px 13px; color:#94a3b8; background:transparent; font-size:12px; font-weight:850; }
.language-btn.active { color:#07101b; background:#67e8f9; }
.splash-copy h1 { margin:8px 0 18px; font-size:clamp(44px,6vw,78px); line-height:.92; letter-spacing:-.06em; }
.splash-lead { margin:0; color:#abb6cc; font-size:clamp(16px,2vw,20px); line-height:1.62; }
.splash-flow { display:grid; grid-template-columns:repeat(2,1fr); gap:9px; margin:28px 0 20px; }
.splash-flow span { display:flex; align-items:center; gap:9px; padding:11px 12px; border:1px solid rgba(255,255,255,.12); border-radius:13px; background:rgba(255,255,255,.045); color:#e9f2ff; font-size:13px; font-weight:800; }
.splash-flow b { width:25px; height:25px; display:grid; place-items:center; flex:0 0 auto; border-radius:8px; color:#07101b; background:#67e8f9; }
.splash-details { color:#7f8ba5; font-size:12px; line-height:1.55; }
.splash-enter { width:100%; margin-top:10px; padding:15px 20px; font-size:16px; }
.splash-reset { align-self:center; margin-top:12px; border:0; padding:4px 8px; color:#fca5a5; background:transparent; font-size:12px; font-weight:800; text-decoration:underline; text-underline-offset:3px; }
.splash-reset:hover { color:#fecaca; }
.splash-progress { min-height:18px; margin:12px 0 0; color:#7f8ba5; text-align:center; font-size:12px; }
.splash-orbit { position:absolute; z-index:1; color:rgba(103,232,249,.09); font-family:Georgia,serif; line-height:1; pointer-events:none; }
.orbit-one { top:-80px; right:-30px; font-size:330px; transform:rotate(12deg); }
.orbit-two { bottom:-80px; left:-40px; font-size:280px; transform:rotate(-14deg); }

.app-shell { min-height: 100vh; display: grid; grid-template-columns: 250px minmax(0, 1fr); }
.sidebar {
  position: sticky; top: 0; height: 100vh;
  padding: 24px 18px; background: color-mix(in srgb, var(--panel) 92%, transparent);
  border-right: 1px solid var(--line); backdrop-filter: blur(24px);
  display: flex; flex-direction: column; z-index: 20;
}
.brand { display: flex; gap: 12px; align-items: center; color: var(--text); background: none; border: 0; text-align: left; padding: 6px; }
.brand-mark { width: 42px; height: 42px; display:grid; place-items:center; border-radius: 13px; font-weight:900; font-size:22px; color:#07101b; background: linear-gradient(135deg,var(--accent),var(--accent-2)); box-shadow:0 8px 24px color-mix(in srgb,var(--accent) 20%, transparent); }
.brand strong { display:block; letter-spacing:.12em; font-size:14px; }
.brand small { display:block; color:var(--muted); margin-top:2px; }
.nav-stack { display:grid; gap:8px; margin-top:42px; }
.nav-btn { border:0; color:var(--muted); background:transparent; border-radius:14px; padding:13px 14px; display:flex; gap:12px; align-items:center; text-align:left; transition:.2s ease; }
.nav-btn span { width:22px; text-align:center; color:var(--accent); }
.nav-btn:hover, .nav-btn.active { color:var(--text); background:var(--panel-3); transform:translateX(2px); }
.sidebar-footer { margin-top:auto; display:grid; gap:8px; }
.connection-pill { border:1px solid var(--line); background:var(--panel-2); color:var(--muted); border-radius:999px; padding:9px 11px; font-size:12px; display:flex; align-items:center; gap:8px; overflow:hidden; white-space:nowrap; text-overflow:ellipsis; }
.dot { width:8px; height:8px; border-radius:50%; background:var(--muted); flex:0 0 auto; }
.connection-pill.online .dot { background:var(--success); box-shadow:0 0 12px var(--success); }

.main-panel { min-width:0; }
.topbar { padding:26px clamp(22px,4vw,56px) 14px; display:flex; align-items:center; gap:20px; justify-content:space-between; position:sticky; top:0; z-index:10; background:linear-gradient(to bottom,var(--bg) 70%,transparent); }
.topbar h1 { margin:0; font-size:clamp(25px,3vw,38px); letter-spacing:-.035em; }
.eyebrow { margin:0 0 4px; color:var(--accent); font-size:11px; font-weight:800; letter-spacing:.18em; }
.top-actions { display:flex; align-items:center; gap:10px; }
.xp-chip, .ghost-btn, .icon-btn { border:1px solid var(--line); background:var(--panel); color:var(--text); box-shadow:var(--shadow); }
.xp-chip { padding:9px 13px; border-radius:999px; font-weight:750; font-size:13px; }
.ghost-btn { padding:9px 14px; border-radius:12px; }
.icon-btn { width:42px; height:42px; border-radius:12px; }
.hidden { display:none !important; }
.mobile-only { display:none; }
.view { padding:16px clamp(22px,4vw,56px) 60px; max-width:1500px; margin:0 auto; }

.hero { display:grid; grid-template-columns:1.2fr .8fr; gap:20px; margin-bottom:22px; }
.hero-card { min-height:270px; position:relative; overflow:hidden; border:1px solid var(--line); border-radius:var(--radius); padding:clamp(24px,4vw,42px); background:linear-gradient(135deg,var(--panel),var(--panel-2)); box-shadow:var(--shadow); }
.hero-card::after { content:"♪"; position:absolute; right:28px; top:-26px; font-size:230px; line-height:1; font-weight:900; color:color-mix(in srgb,var(--accent) 8%, transparent); transform:rotate(8deg); }
.hero-card h2 { position:relative; z-index:1; max-width:660px; margin:0; font-size:clamp(34px,5vw,66px); letter-spacing:-.055em; line-height:.96; }
.hero-card p { position:relative; z-index:1; max-width:640px; color:var(--muted); font-size:16px; line-height:1.55; }
.hero-actions { position:relative; z-index:1; display:flex; gap:10px; flex-wrap:wrap; margin-top:24px; }
.primary-btn, .secondary-btn, .danger-btn { border:0; border-radius:14px; padding:12px 17px; font-weight:800; }
.primary-btn { background:linear-gradient(135deg,var(--accent),#7dd3fc); color:#07101b; box-shadow:0 10px 30px color-mix(in srgb,var(--accent) 24%,transparent); }
.secondary-btn { color:var(--text); border:1px solid var(--line); background:var(--panel-3); }
.danger-btn { color:white; background:var(--danger); }
.restart-btn { border:1px solid color-mix(in srgb,var(--danger) 55%,var(--line)); border-radius:14px; padding:12px 17px; color:#fecaca; background:color-mix(in srgb,var(--danger) 12%,var(--panel-3)); font-weight:800; }
.restart-btn:hover { filter:brightness(1.12); transform:translateY(-1px); }
.restart-btn:active { transform:translateY(1px) scale(.98); }
.primary-btn,.secondary-btn,.danger-btn { transition:transform .12s ease,filter .12s ease,box-shadow .12s ease; }
.primary-btn:hover,.secondary-btn:hover { filter:brightness(1.08); transform:translateY(-1px); }
.primary-btn:active,.secondary-btn:active,.danger-btn:active { transform:translateY(1px) scale(.98); }
.primary-btn:disabled, .secondary-btn:disabled { opacity:.42; cursor:not-allowed; }

.stats-card { border:1px solid var(--line); border-radius:var(--radius); padding:24px; background:var(--panel); box-shadow:var(--shadow); display:flex; flex-direction:column; justify-content:space-between; }
.ring-wrap { display:grid; place-items:center; padding:8px 0 18px; }
.progress-ring { width:150px; aspect-ratio:1; border-radius:50%; display:grid; place-items:center; background:conic-gradient(var(--accent) var(--progress),var(--panel-3) 0); position:relative; }
.progress-ring::before { content:""; position:absolute; inset:13px; border-radius:50%; background:var(--panel); }
.progress-ring span { position:relative; font-size:31px; font-weight:900; }
.stat-grid { display:grid; grid-template-columns:repeat(2,1fr); gap:10px; }
.stat { background:var(--panel-2); border:1px solid var(--line); border-radius:14px; padding:14px; }
.stat strong { display:block; font-size:20px; }
.stat small { color:var(--muted); }

.section-head { display:flex; align-items:end; justify-content:space-between; gap:16px; margin:30px 0 14px; }
.section-head h2 { margin:0; font-size:22px; }
.section-head p { margin:4px 0 0; color:var(--muted); }
.course-grid { display:grid; grid-template-columns:repeat(4,minmax(0,1fr)); gap:14px; }
.course-card { min-height:170px; border:1px solid var(--line); border-radius:18px; background:var(--panel); padding:18px; color:var(--text); text-align:left; position:relative; overflow:hidden; transition:.2s ease; }
.course-card:hover:not(:disabled) { transform:translateY(-3px); border-color:color-mix(in srgb,var(--accent) 45%,var(--line)); box-shadow:var(--shadow); }
.course-card:disabled { cursor:default; opacity:.58; }
.course-num { width:34px; height:34px; border-radius:11px; display:grid; place-items:center; background:var(--panel-3); color:var(--accent); font-weight:900; margin-bottom:20px; }
.course-card h3 { margin:0 0 8px; font-size:16px; }
.course-card p { margin:0; color:var(--muted); font-size:13px; line-height:1.45; }
.course-state { position:absolute; top:16px; right:16px; font-size:11px; font-weight:800; color:var(--muted); }
.course-card.current .course-state { color:var(--success); }
.course-card.current { background:linear-gradient(145deg,color-mix(in srgb,var(--accent) 7%,var(--panel)),var(--panel)); }
.course-card.done { border-color:color-mix(in srgb,var(--success) 55%,var(--line)); background:linear-gradient(145deg,color-mix(in srgb,var(--success) 10%,var(--panel)),var(--panel)); }
.course-card.done .course-state,.course-card.done .course-num { color:var(--success); }

.panel { border:1px solid var(--line); border-radius:var(--radius); background:var(--panel); box-shadow:var(--shadow); padding:clamp(20px,3vw,30px); }
.panel + .panel { margin-top:16px; }
.lesson-layout { display:grid; grid-template-columns:minmax(0,1.5fr) minmax(280px,.5fr); gap:18px; }
.lesson-nav { display:flex; gap:8px; flex-wrap:wrap; margin:0 0 18px; }
.lesson-tab { border:1px solid var(--line); color:var(--muted); background:var(--panel-2); padding:9px 13px; border-radius:12px; }
.lesson-tab.active { color:#07101b; background:var(--accent); border-color:transparent; font-weight:800; }
.lesson-content h2 { margin-top:4px; font-size:clamp(28px,4vw,46px); letter-spacing:-.04em; }
.lesson-content h3 { margin-top:30px; }
.lesson-content p, .lesson-content li { color:var(--muted); line-height:1.72; }
.note-map { display:grid; grid-template-columns:repeat(7,1fr); gap:8px; margin:20px 0; }
.note-chip { border:1px solid var(--line); background:var(--panel-2); border-radius:14px; padding:14px 7px; text-align:center; }
.note-chip strong { display:block; font-size:20px; color:var(--accent); }
.note-chip span { color:var(--muted); }

.staff-card { background:linear-gradient(180deg,#fdfdfd,#eef4fa); color:#111827; border-radius:18px; padding:18px; margin:20px 0; overflow-x:auto; }
.staff-svg { width:100%; min-width:520px; height:auto; display:block; }
.staff-caption { margin:8px 0 0 !important; color:#334155 !important; text-align:center; font-size:13px; line-height:1.45 !important; }
.staff-note { cursor:pointer; transition:.15s; }
.staff-note:hover { transform:translateY(-2px); filter:drop-shadow(0 3px 5px rgba(0,0,0,.25)); }
.staff-label { font-size:12px; fill:#334155; font-weight:700; }

.piano { display:flex; height:150px; max-width:760px; margin:20px 0; position:relative; user-select:none; touch-action:none; }
.key { border:1px solid #b6c1ce; position:relative; display:flex; align-items:flex-end; justify-content:center; padding-bottom:9px; font-weight:800; font-size:12px; }
.key.white { flex:1; background:linear-gradient(#fff,#e9eef5); color:#283548; border-radius:0 0 8px 8px; }
.key.black { width:7.4%; height:62%; background:linear-gradient(#253248,#0b1020); color:white; margin:0 -3.7%; z-index:2; border-radius:0 0 6px 6px; padding-bottom:7px; }
.key.active { background:var(--accent) !important; color:#07101b !important; box-shadow:0 0 22px color-mix(in srgb,var(--accent) 60%,transparent); }

.info-box { border-left:4px solid var(--accent); background:var(--panel-2); border-radius:0 14px 14px 0; padding:14px 16px; color:var(--muted); }
.side-actions { display:grid; gap:10px; position:sticky; top:125px; align-self:start; }
.side-actions .panel { box-shadow:none; }
.mini-title { margin:0 0 12px; font-size:13px; color:var(--muted); text-transform:uppercase; letter-spacing:.12em; }

.exercise-shell { max-width:900px; margin:0 auto; }
.exercise-top { display:flex; justify-content:space-between; gap:12px; align-items:center; margin-bottom:16px; }
.progress-bar { height:7px; background:var(--panel-3); border-radius:999px; overflow:hidden; flex:1; }
.progress-bar > span { display:block; height:100%; background:linear-gradient(90deg,var(--accent),var(--accent-2)); transition:.25s; }
.question-card { min-height:390px; display:flex; flex-direction:column; justify-content:center; align-items:center; text-align:center; }
.question-card h2 { font-size:clamp(26px,4vw,44px); margin:10px 0; }
.question-card .big-note { font-size:90px; line-height:1; margin:20px; color:var(--accent); font-family:serif; }
.answer-grid { width:100%; max-width:650px; display:grid; grid-template-columns:repeat(2,1fr); gap:10px; margin-top:24px; }
.answer-btn { border:1px solid var(--line); color:var(--text); background:var(--panel-2); border-radius:14px; padding:15px; font-weight:750; }
.answer-btn:hover { border-color:var(--accent); }
.answer-btn.good { background:color-mix(in srgb,var(--success) 20%,var(--panel)); border-color:var(--success); animation:correct-pop .34s ease; }
.answer-btn.bad { background:color-mix(in srgb,var(--danger) 18%,var(--panel)); border-color:var(--danger); animation:error-shake .34s ease; }
.celebration-mark { width:74px; height:74px; margin:0 auto 16px; display:grid; place-items:center; border-radius:50%; background:color-mix(in srgb,var(--success) 18%,var(--panel)); border:2px solid var(--success); color:var(--success); font-size:38px; font-weight:900; box-shadow:0 0 36px color-mix(in srgb,var(--success) 26%,transparent); }
.celebration-mark.retry-mark { color:var(--warning); border-color:var(--warning); background:color-mix(in srgb,var(--warning) 14%,var(--panel)); box-shadow:0 0 32px color-mix(in srgb,var(--warning) 20%,transparent); }
.result-mention { color:var(--success); font-size:20px; font-weight:900; margin:4px 0 12px; }
.result-actions { display:flex; gap:10px; justify-content:center; flex-wrap:wrap; margin-top:26px; }
.success-box { border-color:color-mix(in srgb,var(--success) 45%,var(--line)); background:color-mix(in srgb,var(--success) 9%,var(--panel-2)); }
.dictation-form { width:min(100%,560px); margin:26px auto 0; text-align:left; }
.dictation-form label { display:block; margin-bottom:9px; color:var(--text); font-weight:750; }
.dictation-entry { display:grid; grid-template-columns:1fr auto; gap:10px; }
.dictation-input { min-width:0; border:1px solid var(--line); background:var(--panel-2); color:var(--text); border-radius:14px; padding:14px 16px; font:inherit; font-size:20px; text-transform:uppercase; }
.dictation-input.good { border-color:var(--success); }
.dictation-input.bad { border-color:var(--danger); }
.dictation-form small { display:block; margin-top:9px; color:var(--muted); }
.dictation-feedback { min-height:24px; margin-top:12px; font-weight:800; }
.dictation-feedback.good { color:var(--success); }
.dictation-feedback.bad { color:var(--danger); }

.course-symbol-card { min-height:150px; display:grid; place-items:center; text-align:center; background:linear-gradient(145deg,color-mix(in srgb,var(--accent) 10%,var(--panel)),var(--panel)); }
.course-symbol-card span { color:var(--accent); font-family:Georgia,serif; font-size:clamp(38px,6vw,68px); line-height:1; }
.course-symbol-card small { color:var(--muted); font-weight:900; letter-spacing:.16em; }
.course-objective { font-size:18px; color:var(--text) !important; }
.concept-strip { display:grid; grid-template-columns:repeat(auto-fit,minmax(125px,1fr)); gap:10px; margin:22px 0 28px; }
.concept-strip div { padding:14px; border:1px solid var(--line); border-radius:14px; background:var(--panel-2); }
.concept-strip strong,.concept-strip span { display:block; }
.concept-strip strong { color:var(--accent); font-size:18px; }
.concept-strip span { margin-top:4px; color:var(--muted); font-size:12px; }
.theory-step { display:grid; grid-template-columns:42px 1fr; gap:14px; align-items:start; padding:18px 0; border-top:1px solid var(--line); }
.theory-step h3 { margin:0 0 5px; }
.theory-step p { margin:0; }
.step-index { width:38px; height:38px; display:grid; place-items:center; border-radius:12px; color:#07101b; background:var(--accent); font-weight:900; }
.reconstruction-note { margin:14px 0 20px; border-left-color:var(--warning); }
.flow-arrow { width:min(100%,480px); margin:25px auto 0; padding:15px; border:1px solid var(--line); border-radius:16px; background:var(--panel-2); }
.flow-arrow span,.flow-arrow strong { display:block; }
.flow-arrow span { color:var(--muted); font-size:12px; text-transform:uppercase; letter-spacing:.12em; }
.flow-arrow strong { margin-top:5px; color:var(--accent); font-size:20px; }
.auto-note { color:var(--muted); font-size:13px; margin:15px 0 0; }

@keyframes correct-pop {
  0% { transform:scale(1); }
  48% { transform:scale(1.045); box-shadow:0 0 28px color-mix(in srgb,var(--success) 38%,transparent); }
  100% { transform:scale(1); }
}
@keyframes error-shake {
  0%,100% { transform:translateX(0); }
  25% { transform:translateX(-6px); }
  50% { transform:translateX(5px); }
  75% { transform:translateX(-3px); }
}

.practice-grid { display:grid; grid-template-columns:repeat(2,1fr); gap:14px; }
.practice-card { padding:22px; border:1px solid var(--line); border-radius:18px; background:var(--panel); }
.practice-card h3 { margin:0 0 8px; }
.practice-card p { color:var(--muted); min-height:42px; }
.practice-icon { width:46px; height:46px; border-radius:14px; display:grid; place-items:center; background:var(--panel-3); color:var(--accent); font-size:22px; margin-bottom:18px; }

.studio-grid { display:grid; grid-template-columns:1fr 1fr; gap:16px; }
.device-selector { display:grid; gap:7px; margin:20px 0 4px; }
.device-selector label { font-size:13px; font-weight:850; }
.device-selector select { width:100%; }
.device-selector small { color:var(--muted); line-height:1.45; }
.tuner { display:grid; place-items:center; min-height:340px; text-align:center; }
.detected-note { font-size:90px; font-weight:900; letter-spacing:-.08em; line-height:.9; }
.cents { margin-top:12px; color:var(--muted); }
.tuner-meter { width:min(100%,500px); height:16px; border-radius:999px; margin:24px 0 8px; background:linear-gradient(90deg,var(--danger),var(--warning),var(--success),var(--warning),var(--danger)); position:relative; }
.tuner-needle { position:absolute; left:50%; top:-8px; width:3px; height:32px; border-radius:3px; background:var(--text); transition:left .08s linear; }
.device-list { display:grid; gap:8px; margin:14px 0; }
.device-row { border:1px solid var(--line); background:var(--panel-2); border-radius:12px; padding:12px 14px; display:flex; justify-content:space-between; gap:12px; }
.device-row small { color:var(--muted); }

.setting-row { display:flex; justify-content:space-between; gap:20px; align-items:center; padding:16px 0; border-bottom:1px solid var(--line); }
.setting-row:last-child { border-bottom:0; }
.setting-row p { margin:4px 0 0; color:var(--muted); font-size:13px; }
input[type="range"] { width:220px; accent-color:var(--accent); }
select { background:var(--panel-2); color:var(--text); border:1px solid var(--line); padding:10px 12px; border-radius:10px; }

.progress-list { display:grid; gap:10px; }
.progress-row { display:grid; grid-template-columns:45px 1fr auto; gap:13px; align-items:center; border:1px solid var(--line); background:var(--panel-2); border-radius:14px; padding:12px; }
.progress-row .index { width:40px; height:40px; border-radius:12px; display:grid; place-items:center; background:var(--panel-3); color:var(--accent); font-weight:900; }
.progress-row.done { border-color:color-mix(in srgb,var(--success) 45%,var(--line)); }
.progress-row.done .index { color:var(--success); background:color-mix(in srgb,var(--success) 12%,var(--panel-3)); }
.progress-row strong { display:block; }
.progress-row small { color:var(--muted); }
.score-badge { border-radius:999px; padding:7px 10px; background:var(--panel-3); font-size:12px; font-weight:800; }
.progress-reset { display:flex; align-items:center; justify-content:space-between; gap:20px; margin-top:24px; padding-top:20px; border-top:1px solid var(--line); }
.progress-reset p { margin:4px 0 0; color:var(--muted); font-size:13px; }

.toast { position:fixed; left:50%; bottom:24px; transform:translate(-50%,120px); background:#111827; color:white; border:1px solid #32415b; box-shadow:0 18px 60px rgba(0,0,0,.35); border-radius:14px; padding:12px 16px; z-index:100; opacity:0; transition:.25s; max-width:min(90vw,600px); }
.toast.show { transform:translate(-50%,0); opacity:1; }

@media (max-width: 1100px) {
  .course-grid { grid-template-columns:repeat(3,minmax(0,1fr)); }
  .hero { grid-template-columns:1fr; }
  .stats-card { flex-direction:row; gap:25px; align-items:center; }
  .ring-wrap { flex:0 0 180px; }
  .stat-grid { flex:1; }
  .lesson-layout { grid-template-columns:1fr; }
  .side-actions { position:static; grid-template-columns:repeat(2,1fr); }
}

@media (max-width: 760px) {
  .app-shell { grid-template-columns:1fr; }
  .sidebar { position:fixed; left:0; transform:translateX(-105%); width:260px; transition:.25s; box-shadow:20px 0 60px rgba(0,0,0,.4); }
  .sidebar.open { transform:translateX(0); }
  .mobile-only { display:inline-grid; place-items:center; }
  .topbar { padding:16px 16px 10px; }
  .topbar .eyebrow { display:none; }
  .topbar h1 { font-size:24px; }
  .view { padding:10px 16px 45px; }
  .xp-chip { display:none; }
  .course-grid { grid-template-columns:repeat(2,minmax(0,1fr)); }
  .hero-card { min-height:245px; padding:25px; }
  .stats-card { flex-direction:column; }
  .ring-wrap { flex-basis:auto; }
  .practice-grid, .studio-grid { grid-template-columns:1fr; }
  .progress-reset { align-items:stretch; flex-direction:column; }
  .side-actions { grid-template-columns:1fr; }
  .note-map { grid-template-columns:repeat(4,1fr); }
  .answer-grid { grid-template-columns:1fr; }
  .dictation-entry { grid-template-columns:1fr; }
  .setting-row { align-items:flex-start; flex-direction:column; }
  input[type="range"] { width:100%; }
}

@media (max-width: 430px) {
  .course-grid { grid-template-columns:1fr; }
  .top-actions { gap:6px; }
  .hero-card h2 { font-size:42px; }
}

/* Académie MC² branding */
.brand-mark {
  width: 48px;
  min-width: 48px;
  font-size: 15px;
  letter-spacing: -.05em;
  background: linear-gradient(145deg, #f8fbff 0%, #9edcff 35%, #4c67d9 68%, #111936 100%);
  color: #07101b;
  border: 1px solid color-mix(in srgb, var(--accent) 38%, var(--line));
  text-shadow: 0 1px 0 rgba(255,255,255,.8);
}

.omega-credit {
  display: grid;
  grid-template-columns: 48px minmax(0,1fr);
  gap: 10px;
  align-items: center;
  padding: 10px;
  margin-bottom: 4px;
  border: 1px solid var(--line);
  border-radius: 15px;
  background: var(--panel-2);
  color: var(--text);
  text-decoration: none;
  overflow: hidden;
}
.omega-credit:hover { border-color: color-mix(in srgb,var(--accent) 50%,var(--line)); }
.omega-credit img { width: 46px; height: 34px; object-fit: contain; }
.omega-credit span { min-width:0; }
.omega-credit small,
.omega-credit strong,
.omega-credit em { display:block; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
.omega-credit small { color:var(--muted); font-size:9px; text-transform:uppercase; letter-spacing:.13em; }
.omega-credit strong { margin-top:2px; font-size:11px; letter-spacing:.04em; }
.omega-credit em { margin-top:2px; color:var(--accent); font-size:9px; font-style:normal; }

.mc2-hero-mark {
  position: relative;
  z-index: 1;
  width: min(430px, 86%);
  margin: -8px 0 20px;
  padding: 8px 12px;
  border-radius: 16px;
  background: #f8fbff;
  border: 1px solid color-mix(in srgb,var(--accent) 24%,#dbeafe);
  box-shadow: 0 15px 40px rgba(0, 119, 255, .10);
}
.mc2-hero-mark img { width:100%; height:auto; display:block; border-radius:10px; }
.creator-inline {
  position:relative;
  z-index:1;
  display:flex;
  align-items:center;
  gap:10px;
  width:fit-content;
  max-width:100%;
  margin-top:22px;
  padding:9px 12px;
  border:1px solid var(--line);
  border-radius:14px;
  background:color-mix(in srgb,var(--panel-2) 92%,transparent);
  color:var(--muted);
  font-size:12px;
}
.creator-inline img { width:52px; height:36px; object-fit:contain; flex:0 0 auto; }
.creator-inline a { color:var(--accent); text-decoration:none; }
.creator-inline a:hover { text-decoration:underline; }

.challenge-staff {
  padding: 24px 18px;
  border: 2px solid #d8e6f3;
}
.challenge-staff .staff-svg { max-height: 230px; }
.staff-target { filter: drop-shadow(0 2px 2px rgba(0,0,0,.12)); }

.about-brand {
  display:grid;
  grid-template-columns:minmax(0,1.1fr) minmax(260px,.9fr);
  gap:18px;
  margin-top:28px;
  padding-top:24px;
  border-top:1px solid var(--line);
}
.about-mc2 {
  width:100%;
  max-width:480px;
  padding:10px;
  border-radius:16px;
  background:#f8fbff;
  border:1px solid #dbeafe;
}
.about-omega {
  display:flex;
  gap:14px;
  align-items:center;
  padding:16px;
  border-radius:16px;
  background:var(--panel-2);
  border:1px solid var(--line);
}
.about-omega img { width:88px; height:62px; object-fit:contain; }
.about-omega small,.about-omega strong,.about-omega a { display:block; }
.about-omega small { color:var(--muted); margin-bottom:4px; }
.about-omega strong { font-size:16px; }
.about-omega a { color:var(--accent); text-decoration:none; margin-top:4px; font-size:13px; }

@media (max-width: 860px) {
  .splash-screen { padding:12px; align-items:start; }
  .splash-card { grid-template-columns:1fr; min-height:0; margin:auto 0; border-radius:24px; }
  .splash-visual { min-height:210px; padding:26px 28px 20px; }
  .splash-visual img { max-width:440px; }
  .splash-visual p { margin-top:12px; }
  .splash-copy { padding:28px; }
  .language-choice { align-self:center; margin-bottom:20px; }
  .splash-copy h1 { font-size:clamp(40px,12vw,64px); }
  .omega-credit { display:none; }
  .about-brand { grid-template-columns:1fr; }
  .creator-inline { align-items:flex-start; }
}