:root{
 --bg:#f4f7fb;--panel:#fff;--ink:#102842;--muted:#62788f;--line:#d4e1ee;
 --navy:#103f6d;--blue:#2677c8;--green:#16845f;--amber:#c27a11;--red:#b9332b;
 --soft:#edf5fd;--shadow:0 13px 34px rgba(14,42,75,.09);--radius:20px
}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif}
button,input,select{font:inherit}button{cursor:pointer}.shell{max-width:1450px;margin:auto;padding:14px}.topbar{position:sticky;top:6px;z-index:50;border-radius:18px;background:var(--navy);color:#fff;padding:13px 18px;display:flex;justify-content:space-between;align-items:center;gap:15px;box-shadow:var(--shadow)}
.brand h1{font-size:20px;margin:0}.brand .sub{font-size:11px;opacity:.82;margin-top:3px}.row{display:flex;gap:9px;align-items:center;flex-wrap:wrap}.grow{flex:1}.pill{display:inline-flex;align-items:center;border-radius:999px;padding:7px 10px;font-size:11px;font-weight:900;background:#e8f2fb;color:#174d79}.pill.good{background:#e6f7ee;color:#126341}.pill.demo{background:#fff0c7;color:#825000}.pill.dark{background:#12395d;color:#fff}
.grid{display:grid;grid-template-columns:300px minmax(0,1fr);gap:17px;margin-top:17px}.sidebar,.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}.sidebar{padding:15px;height:max-content;position:sticky;top:85px}.progress-ring{width:112px;height:112px;border-radius:50%;margin:0 auto 13px;display:grid;place-items:center;background:conic-gradient(var(--blue) var(--p),#e8eef5 0);position:relative}.progress-ring:before{content:"";position:absolute;inset:10px;background:white;border-radius:50%}.progress-ring b{position:relative;font-size:23px}
.nav{display:grid;gap:7px}.navbtn{border:0;background:#f5f7fa;border-radius:13px;padding:9px 10px;display:grid;grid-template-columns:30px 1fr auto;align-items:center;text-align:left;gap:9px;color:#1d3d5f}.navbtn.active{background:#eaf4ff;outline:1px solid #9fc8ee}.navbtn.done{background:#eff9f4}.num{width:28px;height:28px;border-radius:9px;background:#e1ebf5;display:grid;place-items:center;font-size:12px;font-weight:900}.navbtn.done .num{background:#16855e;color:#fff}.navtitle{font-size:12px;font-weight:900}.navsub{font-size:10px;color:#71849a;margin-top:2px}.navstate{font-size:10px;font-weight:900;color:#17845e}.main{min-width:0}.card{padding:22px}
.hero{display:grid;grid-template-columns:1.12fr .88fr;gap:23px;align-items:center}.hero h2{font-size:42px;line-height:1.03;margin:8px 0 12px;letter-spacing:-.04em}.hero p{font-size:16px;line-height:1.65;color:#445b73}.kicker{display:inline-flex;border-radius:999px;background:#e7f3ff;color:#1762a6;font-weight:900;font-size:11px;padding:6px 9px;letter-spacing:.04em}.visual-panel{min-height:310px;border-radius:22px;background:linear-gradient(145deg,#edf6ff,#f0fbf5);border:1px solid #cfe0ee;padding:25px;display:grid;place-items:center;text-align:center}.visual-emoji{font-size:82px;filter:drop-shadow(0 12px 20px rgba(20,70,110,.12))}.visual-panel h3{margin:11px 0 7px;font-size:24px}.visual-panel p{margin:0;max-width:440px;font-size:13px;color:#50697f}.hero-points{display:grid;gap:9px;margin:15px 0}.hero-point{display:grid;grid-template-columns:28px 1fr;gap:9px;align-items:start}.hero-point b{width:24px;height:24px;border-radius:8px;background:#e8f7ef;color:#14704d;display:grid;place-items:center;font-size:11px}
.identity{margin-top:17px;border:1px solid var(--line);border-radius:17px;padding:15px;background:#fbfdff}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:11px}.field{display:grid;gap:5px}.field.full{grid-column:1/-1}.field label{font-size:11px;font-weight:900;color:#435b73}input,select{width:100%;padding:10px 11px;border:1px solid #c5d5e5;border-radius:11px;background:#fff;color:var(--ink)}.checkline{display:flex;gap:8px;align-items:center;font-size:12px;color:#445b73}.checkline input{width:auto}.lookup-status{font-size:11px;margin-top:8px;color:#60748a}.lookup-status.err{color:#a02720}.lookup-status.ok{color:#126341}
.btn{border:0;border-radius:12px;background:#e8eef5;color:#1a4167;padding:10px 14px;font-weight:900}.btn.primary{background:var(--blue);color:white}.btn.secondary{background:#174f80;color:#fff}.btn.ghost{background:#fff;border:1px solid #c6d6e6}.btn.danger{background:#fff0ee;color:#9b2b23;border:1px solid #efb4af}.btn:disabled{opacity:.45;cursor:not-allowed}.btn-row{display:flex;gap:9px;align-items:center;flex-wrap:wrap;margin-top:12px}
.mission-head{display:flex;justify-content:space-between;gap:13px;align-items:flex-start;margin-bottom:14px}.mission-head h1{margin:5px 0 5px;font-size:32px;letter-spacing:-.025em}.mission-head p{margin:0;color:#587086;line-height:1.5}.points{border-radius:15px;background:#eef5ff;border:1px solid #bad6f0;padding:10px 13px;font-weight:900;white-space:nowrap}.learn-flow-head{display:flex;justify-content:center;gap:11px;align-items:center;border:1px solid #c9dcef;background:#f0f6fd;border-radius:14px;padding:10px;font-weight:900;font-size:12px;color:#274b6e;margin-bottom:14px}
.lesson-grid{display:grid;grid-template-columns:minmax(300px,.82fr) minmax(440px,1.18fr);gap:20px;align-items:start}.lesson-column{display:grid;gap:12px}.learn-intro{border:1px solid #cce0ef;background:linear-gradient(135deg,#eef7ff,#f3fbf7);border-radius:17px;padding:16px}.learn-intro h2{margin:7px 0;font-size:21px}.learn-intro p{margin:0;color:#4c6278;line-height:1.6}.learn-pill{display:inline-flex;border-radius:999px;background:#1d70c3;color:white;padding:5px 9px;font-size:10px;font-weight:950;letter-spacing:.08em}.learn-pill.practice{background:#17845e}.lesson-card{display:grid;grid-template-columns:34px 1fr;gap:11px;border:1px solid #d7e2ee;background:#fff;border-radius:15px;padding:14px}.lesson-step{width:32px;height:32px;border-radius:10px;background:#e8f2fc;color:#1a639f;display:grid;place-items:center;font-weight:950}.lesson-card h3{margin:0 0 5px;font-size:15px}.lesson-card p{margin:0;color:#4e6377;line-height:1.57;font-size:13px}.lesson-card ul,.lesson-check ul{margin:7px 0 0;padding-left:18px}.lesson-card li,.lesson-check li{margin:6px 0;font-size:13px;line-height:1.5}.lesson-check{border:1px solid #f0d095;background:#fff8e9;border-radius:15px;padding:14px;color:#58441b}.teacher-box{border:1px solid #c7d9ed;background:#eef5fd;border-radius:16px;padding:13px;display:flex;justify-content:space-between;gap:12px;align-items:center}.teacher-box strong{display:block;font-size:12px}.teacher-text{font-size:12px;color:#385470;line-height:1.55;margin-top:4px}.modern-box{border:1px solid #c4dfd2;background:#eff9f4;border-radius:15px;padding:14px}.modern-box strong{font-size:12px;color:#126341}.modern-box p{font-size:12px;color:#45685a;line-height:1.55;margin:6px 0 0}.ready-card{border:1px solid #b9dfcf;background:#eef9f4;border-radius:15px;padding:14px}.ready-card strong{color:#145e45}.ready-card p{font-size:12px;color:#4e6b60}.info-card{border:1px solid #d9e3ed;border-radius:14px;padding:13px;background:#fbfdff}.info-card strong{font-size:12px}.info-card p{font-size:12px;color:#4f6579;line-height:1.55;margin:6px 0 0}.audio-card{border:1px solid #cbdced;border-radius:14px;background:#f5f9fd;padding:12px;display:grid;gap:8px}.audio-card .audio-top{display:flex;justify-content:space-between;gap:10px;align-items:center}.audio-card audio{width:100%}.audio-label{font-size:11px;font-weight:900}.audio-sub{font-size:10px;color:#718399}.audio-state{font-size:10px;color:#60748a}.audio-state.err{color:#a02720}.direct-audio{font-size:10px;color:#1762a6;text-decoration:none;font-weight:800}
.practice-toolbar{display:flex;justify-content:space-between;align-items:center;gap:10px;border:1px solid #c6e0d5;background:#f0f9f5;border-radius:15px;padding:11px 13px;margin-bottom:15px}.practice-toolbar>div{display:flex;align-items:center;gap:9px;flex-wrap:wrap}.practice-toolbar strong{font-size:12px;color:#245a48}.stage-grid{display:grid;grid-template-columns:minmax(300px,.8fr) minmax(430px,1.2fr);gap:18px}.question-shell{border:1px solid #d5e1ed;border-radius:17px;padding:15px;background:#fff}.question-top{display:flex;justify-content:space-between;gap:10px;font-size:11px;color:#5d7085;font-weight:850}.bar{height:8px;background:#e7edf4;border-radius:999px;overflow:hidden;margin:10px 0 14px}.bar span{display:block;height:100%;background:linear-gradient(90deg,#287ac9,#1c9368)}.question-shell h3{font-size:18px;line-height:1.45;margin:0 0 12px}.option-list{display:grid;gap:8px}.option-btn{width:100%;text-align:left;border:1px solid #c7d6e5;background:#fff;border-radius:12px;padding:11px 12px;color:#1a3654}.option-btn:hover{background:#f0f6fd;border-color:#8bb8df}.letter{display:inline-grid;place-items:center;width:24px;height:24px;border-radius:8px;background:#e9f1f8;margin-right:9px;font-size:11px;font-weight:950}.feedback{display:grid;gap:5px;border-radius:13px;padding:12px;margin-top:11px;font-size:12px}.feedback.ok{background:#eaf8f1;color:#175c44;border:1px solid #abd9c4}.feedback.err{background:#fff0ee;color:#8d2921;border:1px solid #efb4af}.feedback.warn{background:#fff8e8;color:#6d4b0b;border:1px solid #ebca86}.option-lock{border:1px dashed #d5a64e;background:#fff8e8;border-radius:13px;padding:14px;color:#68490f;font-size:12px;font-weight:800}.finish-grid{display:grid;grid-template-columns:260px 1fr;gap:18px;align-items:start}.score-ring{width:210px;height:210px;border-radius:50%;margin:auto;background:conic-gradient(var(--blue) var(--s),#e8eef5 0);display:grid;place-items:center;position:relative}.score-ring:before{content:"";position:absolute;inset:16px;background:white;border-radius:50%}.score-ring div{position:relative;text-align:center}.score-ring b{font-size:52px}.breakdown{display:grid;gap:7px}.break-row{display:flex;justify-content:space-between;gap:10px;border:1px solid #d8e3ee;border-radius:12px;padding:10px 12px;font-size:12px}.submitbox{margin-top:13px;border:1px solid #c9dcef;background:#f3f8fd;border-radius:15px;padding:14px}.submitmsg{font-size:11px;color:#5e7288;margin-top:8px}.small{font-size:11px;color:#6b8095}.footer{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;color:#6e8297;font-size:10px;padding:18px 4px}.toast{position:fixed;right:18px;bottom:18px;z-index:100;background:#173f65;color:#fff;border-radius:12px;padding:12px 15px;box-shadow:var(--shadow);max-width:360px;font-size:12px}.identity-card{border:1px solid #cce0ef;background:#f3f8fd;border-radius:14px;padding:12px;margin-top:10px}.identity-card b{font-size:13px}.identity-card div{font-size:11px;color:#60748a;margin-top:4px}
@media(max-width:1000px){.grid{grid-template-columns:1fr}.sidebar{position:static}.nav{grid-template-columns:repeat(3,1fr)}.hero,.lesson-grid,.stage-grid,.finish-grid{grid-template-columns:1fr}.visual-panel{min-height:220px}}
@media(max-width:650px){.shell{padding:8px}.topbar{top:3px;padding:11px 12px}.brand h1{font-size:15px}.brand .sub{font-size:9px}.pill{padding:5px 7px;font-size:9px}.card{padding:14px}.hero h2{font-size:32px}.nav{grid-template-columns:1fr 1fr}.sidebar{padding:11px}.progress-ring{width:90px;height:90px}.mission-head{display:block}.points{display:inline-block;margin-top:8px}.form-grid{grid-template-columns:1fr}.field.full{grid-column:auto}.question-shell h3{font-size:16px}.footer{display:block}.footer span{display:block;margin:5px 0}.visual-emoji{font-size:64px}}