:root{--ink: #3f4d51;--ink-strong: #2e3e44;--muted: #5c707a;--ground: #f6f2ec;--card: #ffffff;--line: #e3ded6;--line-soft: #efeae3;--rust: #b0533e;--rust-soft: #fbe9e3;--rust-ink: #a9503c;--gold: #e8b54d;--gold-deep: #c98b2c;--gold-soft: #fbf1dc;--gold-ink: #6b4a0e;--green: #2e5c44;--green-mid: #3d7a5a;--green-soft: #e3f0e8;--slate-soft: #e6ecee;--sand: #ece6dd;--serif: Arvo, "Noto Serif SC", Georgia, serif;--sans: Lato, "PingFang SC", "Noto Sans SC", system-ui, -apple-system, sans-serif;--safe-top: env(safe-area-inset-top, 0px);--safe-bottom: env(safe-area-inset-bottom, 0px);--tab-h: 64px;--app-h: 100vh}@supports (height: 100dvh){:root{--app-h: 100dvh}}.desk,.phone,.phone-scroll{display:contents}.desk-side{display:none}@media (min-width: 900px) and (min-height: 680px){html body{background:#e6dfd4}.desk{display:flex;min-height:100vh;align-items:center;justify-content:center;gap:72px;padding:32px}.desk-side{display:block;max-width:400px}.phone{display:block;position:relative;flex:none;width:414px;height:min(868px,calc(100vh - 64px));border:12px solid #1f2a2e;border-radius:52px;background:var(--ground);overflow:hidden;box-shadow:0 30px 60px -20px #1f2a2e73,0 0 0 1px #1f2a2e40;transform:translateZ(0);--app-h: calc(min(868px, 100vh - 64px) - 24px) }.phone-scroll{display:block;height:100%;overflow-y:auto;overscroll-behavior:contain;scrollbar-width:none}.phone-scroll::-webkit-scrollbar{display:none}}*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}html,body,#root{height:100%}body{margin:0;background:var(--ground);color:var(--ink);font-family:var(--sans);font-size:16px;line-height:1.5;-webkit-font-smoothing:antialiased;overscroll-behavior-y:none}button,input,textarea,select{font:inherit;color:inherit}button{cursor:pointer}a{color:var(--ink-strong)}:focus-visible{outline:3px solid var(--gold-deep);outline-offset:2px}h1,h2,h3{margin:0;color:var(--ink-strong)}.app{min-height:100%;max-width:560px;margin:0 auto;position:relative;background:var(--ground)}.screen{padding:calc(var(--safe-top) + 20px) 20px calc(var(--tab-h) + var(--safe-bottom) + 28px);display:flex;flex-direction:column;gap:20px}.screen.no-tabs{padding-bottom:calc(var(--safe-bottom) + 110px)}.env-banner{position:sticky;top:0;z-index:30;background:var(--gold);color:var(--ink-strong);text-align:center;font-size:12px;font-weight:900;letter-spacing:.12em;padding:calc(var(--safe-top) + 4px) 8px 4px}.env-banner+.app .screen,.env-banner+.app .lesson-top{padding-top:16px}.page-title{font-family:var(--serif);font-weight:400;font-size:28px;line-height:1.2}.kicker{font-size:12px;font-weight:900;letter-spacing:.14em;color:var(--muted);text-transform:uppercase}.kicker.rust{color:var(--rust-ink)}.section-title{font-family:var(--serif);font-weight:400;font-size:19px}.muted{color:var(--muted)}.small{font-size:13px}.row{display:flex;align-items:center;gap:12px}.between{display:flex;justify-content:space-between;align-items:center;gap:12px}.stack{display:flex;flex-direction:column;gap:10px}.grow{flex:1;min-width:0}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:52px;padding:0 22px;border-radius:999px;border:0;font-weight:700;font-size:16px;text-decoration:none}.btn-primary{background:var(--rust);color:#fff}.btn-primary:disabled{background:#c9a49a;cursor:default}.btn-outline{background:transparent;color:var(--ink-strong);border:1.5px solid var(--ink)}.btn-dark{background:var(--ink-strong);color:#fff}.btn-block{width:100%}.btn-sm{min-height:44px;padding:0 16px;font-size:14px}.icon-btn{width:44px;height:44px;border-radius:999px;border:0;background:transparent;display:inline-flex;align-items:center;justify-content:center;color:var(--ink-strong);flex:none;text-decoration:none;position:relative}.icon-btn.filled{background:var(--card);border:1px solid var(--line)}.dot{position:absolute;top:9px;right:10px;width:9px;height:9px;border-radius:999px;background:var(--rust);border:2px solid #fff}.card{background:var(--card);border:1px solid var(--line);border-radius:20px}.card-pad{padding:16px}.list{background:var(--card);border:1px solid var(--line);border-radius:18px;overflow:hidden}.list-item{display:flex;gap:14px;align-items:center;padding:14px 16px;text-decoration:none;color:var(--ink);border-bottom:1px solid var(--line-soft);background:transparent;border-left:0;border-right:0;border-top:0;width:100%;text-align:left;min-height:64px}.list-item:last-child{border-bottom:0}.item-title{display:block;font-weight:700;font-size:15px;color:var(--ink-strong);line-height:1.3}.item-sub{display:block;font-size:13px;color:var(--muted);margin-top:2px}.tile{flex:none;width:40px;height:40px;border-radius:12px;display:flex;align-items:center;justify-content:center}.tile.rust{background:var(--rust-soft);color:var(--rust-ink)}.tile.slate{background:var(--slate-soft);color:var(--ink)}.tile.gold{background:var(--gold-soft);color:#8a5f12}.tile.green{background:var(--green-soft);color:var(--green)}.chip{display:inline-flex;align-items:center;font-size:12px;font-weight:900;border-radius:999px;padding:4px 10px;white-space:nowrap}.chip.gold{background:var(--gold);color:var(--ink-strong);letter-spacing:.1em;font-size:11px}.chip.pass{background:var(--green-soft);color:var(--green)}.chip.info{background:var(--slate-soft);color:var(--ink)}.chip.warn{background:var(--gold-soft);color:var(--gold-ink)}.chip.rust{background:var(--rust);color:#fff}.chip.sand{background:var(--sand);color:var(--ink)}.pills{display:flex;gap:8px;flex-wrap:wrap}.pill{min-height:40px;padding:0 16px;border-radius:999px;border:1.5px solid #d4cdc2;background:var(--card);color:var(--ink);font-weight:700;font-size:13px;display:inline-flex;align-items:center;gap:6px;text-decoration:none;white-space:nowrap}.pill[aria-pressed=true],.pill[aria-selected=true],.pill.on{background:var(--ink-strong);border-color:var(--ink-strong);color:#fff}.scroll-x{display:flex;gap:8px;overflow-x:auto;scrollbar-width:none;margin:0 -20px;padding:0 20px}.scroll-x::-webkit-scrollbar{display:none}.segment{display:flex;background:#e9e3da;border-radius:999px;padding:4px}.segment button{flex:1;min-height:44px;border:0;border-radius:999px;background:transparent;color:var(--muted);font-weight:700;font-size:14px}.segment button[aria-selected=true]{background:#fff;color:var(--ink-strong);box-shadow:0 1px 3px #2e3e441f}.bar{height:8px;background:var(--sand);border-radius:999px;overflow:hidden}.bar>span{display:block;height:100%;background:var(--gold-deep);border-radius:999px}.bar.on-dark{background:#ffffff29}.bar.on-dark>span{background:var(--gold)}.bar.done>span{background:var(--green-mid)}.hero{background:var(--ink-strong);color:#fff;border-radius:24px;padding:22px 20px 20px;display:flex;flex-direction:column;gap:14px;position:relative;overflow:hidden}.hero:after{content:"";position:absolute;right:-60px;top:-60px;width:160px;height:160px;border-radius:999px;border:1.5px solid rgba(232,181,77,.35);box-shadow:0 0 0 26px transparent,inset 0 0 0 26px transparent;pointer-events:none}.hero h2{color:#fff;font-family:var(--serif);font-weight:400;font-size:19px;line-height:1.3}.hero .next{background:#ffffff14;border-radius:14px;padding:12px 14px}.hero .light{color:#d9e1e3}.hero .gold-text{color:var(--gold)}.tabbar{position:fixed;left:50%;transform:translate(-50%);bottom:0;width:100%;max-width:560px;height:calc(var(--tab-h) + var(--safe-bottom));padding-bottom:var(--safe-bottom);background:#fff;border-top:1px solid var(--line);display:flex;z-index:20}.tabbar a{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;text-decoration:none;color:var(--muted);font-size:11px;font-weight:700;position:relative}.tabbar a.active{color:var(--rust);font-weight:900}.tabbar .badge{position:absolute;top:6px;left:50%;margin-left:6px;min-width:18px;height:18px;padding:0 5px;border-radius:999px;background:var(--rust);color:#fff;font-size:11px;font-weight:900;display:flex;align-items:center;justify-content:center}.topbar{display:flex;align-items:center;justify-content:space-between;gap:8px;margin:-8px -10px 0}.dark-head{background:var(--ink-strong);color:#fff;padding:calc(var(--safe-top) + 12px) 20px 22px;display:flex;flex-direction:column;gap:14px}.dark-head h1{color:#fff;font-family:var(--serif);font-weight:400;font-size:21px;line-height:1.28}.dark-head .icon-btn{color:#fff;margin-left:-10px}.action-bar{position:fixed;left:50%;transform:translate(-50%);bottom:0;width:100%;max-width:560px;padding:12px 20px calc(var(--safe-bottom) + 14px);background:var(--ground);border-top:1px solid var(--line);display:flex;gap:10px;z-index:20}.prose{font-size:16px;line-height:1.65;color:var(--ink-strong)}.prose h3{font-family:var(--sans);font-size:12px;font-weight:900;letter-spacing:.14em;color:var(--muted);margin:22px 0 6px}.prose p{margin:0 0 10px;white-space:pre-wrap}.prose ul{margin:0 0 12px;padding-left:20px}.prose li{margin-bottom:4px}.prose hr{border:0;border-top:1px solid var(--line);margin:18px 0}.prose blockquote{margin:0 0 12px;padding:10px 14px;background:var(--gold-soft);border-radius:12px}.video{position:relative;width:100%;aspect-ratio:16/9;border-radius:18px;overflow:hidden;background:#1f2a2e}.video iframe{position:absolute;top:0;right:0;bottom:0;left:0;width:100%;height:100%;border:0}.stat-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}.stat{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:10px 12px}.stat b{display:block;font-family:var(--serif);font-weight:400;font-size:20px;color:var(--ink-strong)}.field{display:flex;flex-direction:column;gap:6px}.field label,.label{font-size:13px;font-weight:700;color:var(--ink-strong)}.input,.textarea,.select{min-height:52px;width:100%;border:1.5px solid #c9c2b8;border-radius:14px;padding:0 16px;font-size:16px;color:var(--ink-strong);background:#fff}.textarea{padding:14px 16px;min-height:140px;resize:vertical;line-height:1.5}.input:focus,.textarea:focus,.select:focus{outline:none;border-color:var(--ink-strong)}.error{background:var(--rust-soft);color:#7d3424;border-radius:12px;padding:10px 14px;font-size:14px}.note{background:var(--slate-soft);color:var(--ink-strong);border-radius:12px;padding:10px 14px;font-size:14px}.qnav{display:grid;gap:4px}.qnav button{height:10px;border-radius:999px;border:0;padding:0;background:var(--line)}.qnav button.answered{background:var(--ink-strong)}.qnav button.flagged{background:var(--gold)}.qnav button.current{outline:2px solid var(--rust);outline-offset:2px}.qnav button.right{background:var(--green-mid)}.qnav button.wrong{background:var(--rust)}.option{display:flex;gap:14px;align-items:flex-start;width:100%;min-height:60px;padding:14px;border-radius:16px;border:2px solid var(--line);background:#fff;color:var(--ink-strong);text-align:left;font-size:15px;line-height:1.45}.option .letter{flex:none;width:30px;height:30px;border-radius:999px;display:flex;align-items:center;justify-content:center;font-weight:900;font-size:13px;background:#f1ece4;color:var(--ink)}.option[aria-checked=true]{border-color:var(--ink-strong);background:#eef2f3}.option[aria-checked=true] .letter{background:var(--ink-strong);color:#fff}.option.is-right{border-color:var(--green-mid);background:var(--green-soft)}.option.is-wrong{border-color:var(--rust);background:var(--rust-soft)}.ac-grid{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:6px}.ac{min-height:46px;border-radius:12px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:1px;font-weight:900;font-size:13px;border:1.5px dashed #9aa6aa;background:#fff;color:#4f5f66}.ac small{font-size:10px;letter-spacing:.04em}.ac.achieved{background:var(--green);color:#fff;border:1.5px solid var(--green)}.ac.evidence{background:var(--gold-soft);color:var(--gold-ink);border:1.5px solid #8a5f12}.legend{display:flex;flex-wrap:wrap;gap:6px 14px;font-size:12px;color:var(--muted)}.legend span{display:inline-flex;align-items:center;gap:6px}.legend i{width:12px;height:12px;border-radius:4px;display:inline-block}.sheet-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;background:#1f2a2e73;z-index:40;display:flex;align-items:flex-end;justify-content:center}.sheet{width:100%;max-width:560px;max-height:calc(var(--app-h) * .92);overflow-y:auto;background:var(--ground);border-radius:26px 26px 0 0;padding:10px 20px calc(var(--safe-bottom) + 20px);display:flex;flex-direction:column;gap:14px}.sheet .grab{width:40px;height:5px;border-radius:999px;background:#cfc8be;margin:0 auto 4px}.check{display:flex;align-items:flex-start;gap:12px;padding:10px 0;font-size:14px;line-height:1.45}.check input{width:22px;height:22px;margin:1px 0 0;accent-color:var(--ink-strong);flex:none}.avatar{flex:none;width:42px;height:42px;border-radius:999px;background:var(--ink-strong);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:900;font-size:13px}.bubble{max-width:82%;padding:10px 14px;border-radius:18px;font-size:15px;line-height:1.45;white-space:pre-wrap;word-wrap:break-word}.bubble.me{align-self:flex-end;background:var(--ink-strong);color:#fff;border-bottom-right-radius:6px}.bubble.them{align-self:flex-start;background:#fff;border:1px solid var(--line);color:var(--ink-strong);border-bottom-left-radius:6px}.composer{position:fixed;left:50%;transform:translate(-50%);bottom:0;width:100%;max-width:560px;padding:10px 14px calc(var(--safe-bottom) + 10px);background:#fff;border-top:1px solid var(--line);display:flex;gap:8px;align-items:flex-end;z-index:20}.composer textarea{flex:1;min-height:44px;max-height:140px;border:1.5px solid #c9c2b8;border-radius:22px;padding:10px 16px;font-size:16px;resize:none}.center{display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;gap:12px;padding:40px 20px}.spinner{width:28px;height:28px;border-radius:999px;border:3px solid var(--line);border-top-color:var(--rust);animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.toast{position:fixed;left:50%;transform:translate(-50%);bottom:calc(var(--tab-h) + var(--safe-bottom) + 16px);background:var(--ink-strong);color:#fff;padding:12px 18px;border-radius:14px;font-size:14px;z-index:50;max-width:calc(100% - 40px)}.update-bar{position:fixed;left:50%;transform:translate(-50%);top:calc(var(--safe-top) + 10px);z-index:60;background:var(--ink-strong);color:#fff;border-radius:16px;padding:10px 10px 10px 16px;display:flex;gap:10px;align-items:center;font-size:14px;width:calc(100% - 24px);max-width:520px}.visually-hidden{position:absolute!important;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}@media (prefers-reduced-motion: reduce){.spinner{animation-duration:2s}}