:root{--navy:#0a2558;--amber:#e79d30;--bg:#f4f6fa;--ok:#1d7a46;--bad:#b2471b;--mut:#56627a}
*{box-sizing:border-box}body{margin:0;font-family:-apple-system,system-ui,Segoe UI,Roboto,sans-serif;background:var(--bg);color:#1a2233;padding-bottom:calc(70px + env(safe-area-inset-bottom))}
header{background:var(--navy);color:#fff;padding:10px 14px;padding-top:calc(10px + env(safe-area-inset-top));display:flex;align-items:center;gap:10px;position:sticky;top:0;z-index:5}
header img{width:34px;height:34px;border-radius:8px}header div{flex:1;line-height:1.15}header small{display:block;color:#c9d3ea;font-size:12px}
.hbtn{background:none;color:#fff;font-size:22px;padding:4px 8px}
main{max-width:600px;margin:0 auto;padding:14px}
nav{position:fixed;bottom:0;left:0;right:0;background:#fff;border-top:1px solid #dde3ef;display:flex;padding-bottom:env(safe-area-inset-bottom);z-index:6}
nav a{flex:1;text-align:center;padding:8px 0 7px;font-size:11px;color:var(--mut);text-decoration:none}nav a span{display:block;font-size:21px}
nav a.on{color:var(--navy);font-weight:700}nav a.on span{filter:none}
.card{background:#fff;border-radius:14px;padding:14px;margin:0 0 12px;box-shadow:0 1px 3px #0a255822}
.hero{background:linear-gradient(135deg,var(--navy),#163b80);color:#fff}.hero .lbl{color:#f3c47e}
h2{font-size:19px;margin:4px 0 10px;color:var(--navy)}.hero h2{color:#fff}h3{font-size:15px;margin:0 0 6px;color:var(--navy)}
button{font:inherit;border:0;border-radius:12px;padding:12px 16px;cursor:pointer}
.primary{background:var(--amber);color:#1a1300;font-weight:700;width:100%}.ghost{background:#e6ebf5;color:var(--navy)}
input,textarea{width:100%;border:1px solid #c8d1e3;border-radius:10px;padding:12px;font:inherit;margin:6px 0;background:#fff}textarea{min-height:90px}
.lbl{font-size:12px;font-weight:700;text-transform:uppercase;color:var(--mut);margin:8px 0 4px;letter-spacing:.03em}
.mut{color:var(--mut);font-size:13px}.err{color:var(--bad);font-size:14px;min-height:18px}
.grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}.tile{background:#fff;border-radius:14px;padding:14px;box-shadow:0 1px 3px #0a255822;text-decoration:none;color:inherit}
.tile b{color:var(--navy);display:block}.tile span{font-size:24px}.tile small{color:var(--mut)}
.streak{font-size:32px;font-weight:800;color:var(--amber)}
.list a,.item{display:block;background:#fff;border-radius:12px;padding:12px 14px;margin-bottom:8px;text-decoration:none;color:inherit;box-shadow:0 1px 2px #0a255818}
.list a b{color:var(--navy)}.code{display:inline-block;background:#eaf0fb;color:var(--navy);font-size:12px;padding:2px 7px;border-radius:8px;margin-right:4px;font-weight:600}
.cite{font-size:13px;margin:3px 0}.cite a{color:var(--navy)}
details{background:#fff;border-radius:12px;margin-bottom:8px;box-shadow:0 1px 2px #0a255818}summary{padding:12px 14px;cursor:pointer}details>div{padding:0 14px 12px}
.opt{display:block;width:100%;text-align:left;background:#fff;border:2px solid #dbe2f0;margin:8px 0;color:#1a2233}
.opt.right{border-color:var(--ok);background:#e8f6ee}.opt.wrong{border-color:var(--bad);background:#fbece6}
.bar{height:6px;background:#dde3ef;border-radius:3px;overflow:hidden;margin-bottom:10px}.bar i{display:block;height:100%;background:var(--amber)}
.dpe{border-left:4px solid var(--navy)}.me{border-left:4px solid var(--amber)}.who{font-size:12px;font-weight:700;color:var(--navy);letter-spacing:.05em}
.mic{width:76px;height:76px;border-radius:50%;background:var(--navy);color:#fff;font-size:30px;display:block;margin:6px auto}
.mic.rec{background:#c0392b;animation:p 1s infinite}@keyframes p{50%{box-shadow:0 0 0 12px #c0392b33}}
.sat{color:var(--ok);font-weight:800}.nw{color:var(--bad);font-weight:800}
.disc{background:#fff7e9;border:1px solid #f1d29f;color:#6b4300;font-size:13px;border-radius:10px;padding:8px 10px;margin-bottom:10px}
.ph{border:2px dashed #c8d1e3;background:#fafbfe}.tag{font-size:11px;font-weight:700;background:#fde3bd;color:#7a4a00;padding:2px 8px;border-radius:10px}
.row{display:flex;gap:8px}.row>*{flex:1}.center{text-align:center}
.auth{max-width:420px;margin:20px auto}.auth img{width:200px;display:block;margin:10px auto 16px}
.msg-a{white-space:pre-wrap}
/* ---- v2 polish ---- */
:root{--bg:#f2f4f8;--line:#e3e8f1;--sh:0 1px 2px rgba(10,37,88,.06),0 8px 24px rgba(10,37,88,.08)}
body{font-family:Inter,-apple-system,system-ui,sans-serif;-webkit-font-smoothing:antialiased;letter-spacing:-.005em;padding-bottom:calc(90px + env(safe-area-inset-bottom))}
header{background:rgba(255,255,255,.85);backdrop-filter:saturate(180%) blur(18px);-webkit-backdrop-filter:saturate(180%) blur(18px);color:var(--navy);border-bottom:1px solid var(--line);padding:12px 18px;padding-top:calc(12px + env(safe-area-inset-top))}
header b{font-weight:800;letter-spacing:-.02em}header small{color:var(--mut)}.hbtn{color:var(--navy)}
main{padding:18px 16px}
h2{font-size:26px;font-weight:800;letter-spacing:-.025em;margin:6px 0 12px}h3{font-weight:700}
.card,.tile,.list a,.item,details{border-radius:20px;box-shadow:var(--sh);border:1px solid rgba(10,37,88,.04)}
.card{padding:18px;margin-bottom:14px}
.hero2{background:radial-gradient(120% 90% at 100% 0%,#1f4fa8 0%,transparent 60%),linear-gradient(160deg,#0a2558 0%,#0e2f6e 55%,#071a40 100%);color:#fff;border-radius:28px;padding:22px 20px 20px;box-shadow:0 18px 40px rgba(10,37,88,.35);margin-bottom:16px}
.hero2 .hi{font-size:14px;color:#b9c7e6;font-weight:500;margin-bottom:14px}.hero2 .lbl{color:#f3c47e;margin:0 0 6px}
.hero2 h1{font-size:22px;line-height:1.3;font-weight:700;letter-spacing:-.02em;margin:0 0 12px}
.chips{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:14px}.chip{font-size:12px;font-weight:600;background:#e79d30;color:#2a1a00;padding:4px 10px;border-radius:99px}.ghostc{background:rgba(255,255,255,.12);color:#dfe7f7}
.reveal{background:rgba(255,255,255,.08)!important;color:#fff;box-shadow:none!important;border:1px solid rgba(255,255,255,.12)!important;border-radius:16px!important;margin-bottom:14px}.reveal summary{font-weight:600;font-size:14px}
.primary{border-radius:16px;padding:15px;font-weight:700;box-shadow:0 6px 16px rgba(231,157,48,.35)}.ghost{border-radius:16px;font-weight:600}
.stats{display:grid;grid-template-columns:1fr 1fr;gap:12px}.stat{display:flex;align-items:center;gap:12px;padding:14px}.stat b{display:block;color:var(--navy);font-size:14px}.stat small{color:var(--mut);font-size:12px}
.ring{--p:0;border-radius:50%;flex:none;display:grid;place-items:center;background:conic-gradient(var(--amber) calc(var(--p)*1%),#e8edf6 0)}
.ring span{background:#fff;border-radius:50%;width:76%;height:76%;display:grid;place-items:center;font-weight:800;color:var(--navy);font-size:17px}
.hero .ring span{background:#0e2f6e;color:#fff;font-size:26px}
.sect{font-size:13px;font-weight:700;color:var(--mut);text-transform:uppercase;letter-spacing:.06em;margin:22px 4px 10px}
.grid{gap:12px}.tile{padding:16px;display:flex;flex-direction:column;gap:4px}.tile b{font-size:15px;margin-top:8px}.tile small{font-size:12px;line-height:1.35}
.ic{width:40px;height:40px;border-radius:12px;background:#eaf0fb;color:var(--navy);display:grid;place-items:center}.ic svg{width:22px;height:22px}
.list a{padding:16px 18px;margin-bottom:10px;position:relative}.list a b{font-weight:700}.rowl{display:flex!important;align-items:center;gap:10px}.rowl b{flex:1}.chev{color:#aab4c8;font-size:22px}
.code{border-radius:8px;font-weight:700;background:#eaf0fb}
.pbar{height:6px;background:#e8edf6;border-radius:99px;overflow:hidden;margin-top:10px}.pbar i{display:block;height:100%;background:linear-gradient(90deg,#e79d30,#f2b860);border-radius:99px}
.bar{height:8px;border-radius:99px}.bar i{border-radius:99px;background:linear-gradient(90deg,#e79d30,#f2b860)}
details summary{padding:15px 18px;font-weight:500;list-style:none}details summary::-webkit-details-marker{display:none}details[open]{box-shadow:0 0 0 2px #c9d6ef,var(--sh)}details>div{padding:0 18px 16px}
.lbl{color:#7a869c;letter-spacing:.06em}
.opt{border:1.5px solid var(--line);border-radius:16px;padding:14px;display:flex;gap:12px;align-items:center;box-shadow:0 1px 2px rgba(10,37,88,.05);transition:.15s}
.ol{flex:none;width:30px;height:30px;border-radius:50%;background:#eef2f9;color:var(--navy);display:grid;place-items:center;font-weight:700;font-size:13px}
.opt.right{border-color:#2f9e5f;background:#ecf8f1}.opt.right .ol{background:#2f9e5f;color:#fff}.opt.wrong{border-color:#d0552a;background:#fdf0ea}.opt.wrong .ol{background:#d0552a;color:#fff}.opt:disabled{cursor:default}
.bub{max-width:86%;padding:12px 16px;border-radius:22px;margin:8px 0;line-height:1.45;font-size:15px}
.bub.me{margin-left:auto;background:var(--navy);color:#fff;border-bottom-right-radius:6px}
.bub.ai{background:#fff;box-shadow:var(--sh);border-bottom-left-radius:6px}.bub.ai a{color:var(--navy)}
.composer{position:sticky;bottom:calc(84px + env(safe-area-inset-bottom));background:#fff;border-radius:24px;box-shadow:var(--sh);padding:10px;display:flex;gap:8px;align-items:flex-end}
.composer textarea{margin:0;border:0;min-height:44px!important;background:#f2f4f8;border-radius:18px}.composer .primary{width:auto;padding:12px 16px}
.dpe{border-left:0;border-radius:22px}.disc{border-radius:16px}
input,textarea{border-radius:14px;border-color:var(--line)}
nav{left:12px;right:12px;bottom:calc(10px + env(safe-area-inset-bottom));border:1px solid rgba(10,37,88,.06);border-radius:26px;background:rgba(255,255,255,.92);backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);box-shadow:0 10px 30px rgba(10,37,88,.18);padding:6px;max-width:560px;margin:0 auto}
nav a{display:flex;flex-direction:column;align-items:center;gap:3px;padding:8px 0;border-radius:18px;font-size:10.5px;font-weight:600}nav a svg{width:23px;height:23px}nav a em{font-style:normal}
nav a.on{background:#eaf0fb;color:var(--navy)}nav a.on svg{color:var(--amber);stroke-width:2.2}
.bub.me{border-left:0}
main>p>a{color:var(--navy);text-decoration:none;font-weight:600;font-size:15px}

.seg{display:flex;background:#0001;border-radius:10px;padding:3px;margin:6px 0 10px}.seg a{flex:1;text-align:center;padding:7px;border-radius:8px;text-decoration:none;color:inherit;font-weight:600}.seg a.on{background:#fff;box-shadow:0 1px 3px #0002}
.shelf{display:grid;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:10px;margin-bottom:12px}.book{display:flex;flex-direction:column;gap:3px;padding:12px;border-radius:12px;background:#fff;box-shadow:0 1px 4px #0001;text-decoration:none;color:inherit}.book span{font-size:26px}.book small{font-size:12px;line-height:1.3}
.reader p{line-height:1.6;margin:0 0 12px}.reader h4{margin:16px 0 6px}.pg{font-size:12px;border-top:1px dashed #9aa;margin:14px 0 8px;padding-top:4px;text-align:right}.hl{background:#fff3b0;border-radius:6px;padding:4px}

.fig{margin:10px 0 16px;text-align:center}.fig img{max-width:100%;height:auto;border-radius:8px;background:#f3f5f8;cursor:zoom-in;box-shadow:0 1px 4px #0002}.fig figcaption{font-size:13px;color:#566;margin-top:6px;text-align:left}
.zoom{position:fixed;inset:0;background:#000d;z-index:99;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:12px;overflow:auto}.zoom img{max-width:100%;max-height:85vh;background:#fff;border-radius:6px}.zoom p{color:#fff;font-size:14px;margin-top:10px}
.cite .faa{font-size:12px;opacity:.75;margin-left:4px}

.ok{color:#127a3d;font-weight:600}.sm{padding:4px 10px;font-size:12px;width:auto;display:inline-block}.post p{line-height:1.6}.post ul{padding-left:20px;line-height:1.6}.post sup a{text-decoration:none;font-size:11px}textarea{font:inherit;border:1px solid #d5dbe8;border-radius:10px;padding:8px;box-sizing:border-box;margin:4px 0 10px}
.spk.playing{background:#e8f0ff;border-color:#9db6ef}select{font:inherit;padding:8px;border:1px solid #d5dbe8;border-radius:10px;background:#fff}