:root{font-family:Inter,system-ui,-apple-system,Segoe UI,sans-serif;color:#e9eef9;background:#0b1120;color-scheme:dark}*{box-sizing:border-box}body{margin:0;min-height:100vh;background:radial-gradient(ellipse at 80% 0%,#183057 0%,#0b1120 48%)}a{color:inherit;text-decoration:none}.nav{border-bottom:1px solid #233049;background:#0b1222d9;padding:19px max(24px,calc((100vw - 1070px)/2));display:flex;align-items:center;justify-content:space-between;gap:15px}.brand{font-size:15px;letter-spacing:1.1px;color:#6cadff}.brand b{color:#f3f7ff}.brand span{color:#a3b4d0}.right{display:flex;gap:12px;align-items:center}.pill{background:#1b2b44;border:1px solid #30425d;border-radius:100px;padding:8px 13px;color:#c9daf2;font-size:13px}.navbtn{background:none;color:#c4d2e7;border:0;cursor:pointer;padding:8px}.container{max-width:1070px;padding:35px 24px 60px;margin:auto}.hero{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:35px;border:1px solid #304160;border-radius:24px;background:linear-gradient(110deg,#192c49,#101b30);margin-bottom:32px}.eyebrow{color:#72b4ff;font-size:11px;font-weight:800;letter-spacing:1.5px;text-transform:uppercase}h1{font-size:clamp(28px,4vw,42px);line-height:1.12;letter-spacing:-1px;margin:12px 0}h2{font-size:23px;margin:0 0 15px}h3{margin:4px 0 6px;font-size:18px}p{color:#b3c2d9;line-height:1.65} .badges{display:flex;gap:8px;flex-wrap:wrap;margin-top:23px}.progress-ring{flex-shrink:0;border:9px solid #2b73bd;border-left-color:#273951;border-radius:100%;height:146px;width:146px;display:flex;flex-direction:column;align-items:center;justify-content:center}.progress-ring strong{font-size:33px}.progress-ring span{font-size:11px;color:#a2b4ce}.section-head{display:flex;align-items:center;justify-content:space-between;gap:12px}.muted{color:#9cacc3}.small{font-size:13px}.lesson-list{display:grid;gap:12px}.lesson-card{display:flex;align-items:center;gap:19px;border:1px solid #293a54;border-radius:15px;background:#121d30;padding:19px 23px;transition:background .2s,border-color .2s}.lesson-card:hover{background:#1b2e48;border-color:#488ed5}.lesson-number{font-size:25px;color:#6baafb;font-weight:700}.lesson-content{flex:1}.lesson-card h3{margin:5px 0}.lesson-card p{margin:0;font-size:14px}.status{font-size:13px;color:#7ebaff;white-space:nowrap}.status.done{color:#54e0a9}.note{margin-top:25px;border:1px solid #2b3a55;border-radius:14px;padding:18px 24px;background:#10192b}.note p{margin:5px 0}.panel{background:#111d31;border:1px solid #2a3a55;border-radius:18px;padding:29px;margin-bottom:22px}.lesson-hero{padding:19px 0 25px}.lesson-hero p{margin:0}.back{font-size:14px;color:#8cbfff}.chart{width:100%;max-width:660px;display:block;margin:24px auto 0;background:#0c1629;border:1px solid #263952;border-radius:12px;padding:12px}.option{display:flex;align-items:center;gap:12px;border:1px solid #2d415d;padding:16px;border-radius:10px;margin:10px 0;cursor:pointer}.option:has(input:checked){background:#1c3555;border-color:#539ce9}.option input{accent-color:#599ffa}.primary,.secondary{display:inline-block;background:#3184e0;border:0;border-radius:10px;color:#fff;padding:13px 21px;font-weight:700;cursor:pointer;margin-top:13px;font-size:14px}.primary:hover{background:#4d9af0}.secondary{background:#253956}.login-wrap{max-width:450px;margin:75px auto}.login h1{font-size:34px}.login form{display:grid;gap:20px;margin:25px 0}.login form label{display:grid;gap:8px;color:#cbd8e9;font-size:14px}.login input{width:100%;padding:13px 12px;background:#0a1528;border:1px solid #3c4d65;border-radius:8px;color:white;font-size:16px}.login .primary{width:100%}.error{background:#572a34;color:#ffb2bd;padding:10px;border-radius:7px}.result{text-align:center;max-width:650px;margin:35px auto}.result-icon{border-radius:50%;background:#203d5f;font-size:43px;height:80px;width:80px;display:grid;place-items:center;margin:0 auto;color:#73cbff}.explain{margin:22px 0;background:#0b1729;border:1px solid #28435c;border-radius:12px;padding:19px;color:#cbd8e9}.actions{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}.linkbtn{margin-top:0}footer{border-top:1px solid #253450;color:#7c8fa9;text-align:center;padding:24px;font-size:12px}.inline{display:inline}.login-wrap .panel{box-shadow:0 20px 90px #0006}@media(max-width:660px){.nav{padding:14px}.brand{font-size:12px}.nav .pill{display:none}.container{padding:24px 14px 45px}.hero{padding:22px;align-items:flex-start}.progress-ring{height:93px;width:93px;border-width:6px}.progress-ring strong{font-size:21px}.progress-ring span{text-align:center;font-size:9px}.lesson-card{gap:12px;padding:15px}.lesson-number{font-size:18px}.lesson-card h3{font-size:15px}.lesson-card p{font-size:12px}.status{font-size:11px}.panel{padding:19px}.section-head{display:block}}

.game-banner{display:flex;align-items:center;justify-content:space-between;gap:22px;background:linear-gradient(110deg,#123a45,#162746);border:1px solid #35677a;border-radius:19px;padding:24px;margin-bottom:32px}.game-banner p{margin:8px 0}.game-banner .linkbtn{white-space:nowrap}.game-options{display:grid;grid-template-columns:repeat(auto-fit,minmax(155px,1fr));gap:14px;margin-top:22px}.game-option{color:#e9eef9;background:#172943;border:2px solid #36516f;padding:16px 12px;border-radius:14px;cursor:pointer;display:flex;flex-direction:column;align-items:center;gap:8px;font:inherit}.game-option:hover,.game-option:focus{border-color:#76bcff;background:#224061}.mini-candle{height:128px;width:100px;background:#101d31;border-radius:12px}.game-meter{height:11px;border-radius:20px;background:#22344c;overflow:hidden;margin:5px 0 22px}.game-meter div{height:100%;background:#40c6a2}.game-option strong{text-align:center}@media(max-width:660px){.game-banner{flex-direction:column;align-items:flex-start}.game-options{grid-template-columns:repeat(2,minmax(0,1fr))}}

/* V0.3 touch-first junior learning */
.junior-welcome{display:flex;gap:20px;align-items:center;background:linear-gradient(120deg,#164754,#172e63);padding:25px;border-radius:24px;border:1px solid #3e8e9d;margin-bottom:18px}.junior-welcome h2{margin:7px 0;font-size:clamp(22px,4vw,31px)}.junior-welcome p{margin:5px 0 12px}.mascot{font-size:70px;line-height:1}.junior-tip{background:#193650;border:1px solid #356d88;padding:15px;border-radius:13px;color:#eff7fd;line-height:1.55}.family-card{display:flex;justify-content:space-between;gap:10px;border-bottom:1px solid #293b55;padding:15px 5px}.family-card:last-child{border-bottom:0}.family-card span{color:#a9c8e7}.game-option,.option{min-height:65px;touch-action:manipulation}.primary,.secondary{min-height:48px;display:inline-flex;align-items:center;justify-content:center}.navbtn{min-height:44px}.lesson-card{min-height:85px}@media(max-width:660px){.junior-welcome{padding:20px;align-items:flex-start}.mascot{font-size:45px}.hero{flex-direction:column}.progress-ring{align-self:flex-end}.game-options{grid-template-columns:repeat(2,minmax(0,1fr))}.game-option{padding:12px 7px}.mini-candle{width:80px;height:108px}.lesson-card{flex-wrap:wrap}.status{margin-left:auto}.family-card{flex-direction:column}}

.teaching-step{border-left:3px solid #3bb7a3;padding:13px 16px;margin:16px 0;background:rgba(59,183,163,.08);border-radius:0 12px 12px 0}.teaching-step h3{margin:6px 0}.teaching-step p{line-height:1.7;margin:5px 0;font-size:1.04rem}

/* v0.4 journey */
.journey-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(235px,1fr));gap:16px;margin:22px 0}.journey-card{display:block;padding:22px;border-radius:18px;background:#14263e;border:1px solid #355174;text-decoration:none;color:#f1f6ff;min-height:220px}.journey-card h2{font-size:23px;margin:12px 0}.journey-card p{line-height:1.6;color:#bed0e2}.journey-card.locked{opacity:.5}.quiz-set{border:1px solid #355174;border-radius:12px;padding:14px;margin:16px 0}.quiz-set legend{font-weight:700;line-height:1.5;padding:5px}.journey-card:focus-visible,.lesson-card:focus-visible{outline:3px solid #ffda73}

/* Guided teacher v0.5 */
.instructor{background:linear-gradient(120deg,#183855,#14213b);border:1px solid #416783;border-radius:16px;padding:20px;margin-bottom:18px}.teacher-head{display:flex;align-items:center;gap:14px}.teacher-avatar{font-size:32px;background:#274865;padding:12px;border-radius:50%}.teacher-head p{margin:4px 0}.teacher-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:14px}.teacher-actions button{min-height:48px;padding:12px 15px;border-radius:10px;background:#317bd2;color:white;border:1px solid #7aafd8;font-weight:700;cursor:pointer}.teacher-actions button:focus-visible{outline:3px solid #ffd166}.teacher-status{font-size:14px;color:#c9def7}.teacher-diagram{display:grid;justify-items:center;margin:20px 0}.teacher-visual{display:block;width:min(100%,440px);border-radius:14px}.lesson-glow{animation:lesson-pulse 1.5s infinite alternate}.lesson-line{stroke-dasharray:450;stroke-dashoffset:450;animation:lesson-draw 4s ease forwards}.guided-step.teacher-active{border-left-color:#ffcd69;background:#263b52;box-shadow:0 0 0 2px #ffd16655}.guided-step{transition:background .2s}@keyframes lesson-pulse{to{opacity:.35}}@keyframes lesson-draw{to{stroke-dashoffset:0}}@media(prefers-reduced-motion:reduce){.lesson-glow,.lesson-line{animation:none;stroke-dashoffset:0}}