:root{color-scheme:light;--paper:#f5f4ec;--white:#fffdf7;--ink:#152e28;--soft:#52655c;--line:#d7ded3;--forest:#103630;--forest2:#17463e;--lime:#d6ed96;--green:#285b44;--rose:#9a3c2e;--radius:20px;--mono:ui-monospace,Consolas,monospace;font-family:"Microsoft YaHei","PingFang SC",system-ui,sans-serif}
*{box-sizing:border-box}
body{margin:0;background:var(--paper);color:var(--ink);min-height:100vh;display:flex;flex-direction:column}
button,input,select,textarea{font:inherit}
button{cursor:pointer}
button:disabled{cursor:default;opacity:.48}
button:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible,a:focus-visible,summary:focus-visible{outline:3px solid #43835d;outline-offset:3px}
button,a{-webkit-tap-highlight-color:transparent}
button{color:inherit}
a{color:var(--green)}
.header{background:var(--forest);color:#f9f9eb;padding:0 24px;border-bottom:1px solid #36524a;position:sticky;top:0;z-index:5}
.header-inner{max-width:1100px;margin:auto;display:flex;align-items:center;justify-content:space-between;min-height:66px;gap:12px}
.brand{display:flex;align-items:center;gap:11px;padding:0;border:0;background:none;color:inherit;font-size:19px;font-weight:800;white-space:nowrap}
.brand small{font-size:11px;font-weight:500;color:#b7cbc0;margin-left:7px;letter-spacing:.04em}
.logo{font:bold 20px var(--mono);display:grid;place-content:center;position:relative;width:34px;height:34px;border-radius:10px;background:var(--lime);color:var(--forest);padding-right:4px}
.logo span{position:absolute;left:21px;bottom:5px}
nav{display:flex;gap:5px}
nav button{background:transparent;border:0;border-radius:8px;padding:9px 14px;color:#d1dfd6;white-space:nowrap}
nav button:hover,nav button[aria-current=page]{background:#285149;color:white}
#app{width:min(1100px,calc(100% - 48px));margin:30px auto 38px;flex:1;outline:none}
#footer{margin:auto;width:min(1100px,calc(100% - 48px));border-top:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:15px 0 max(15px,env(safe-area-inset-bottom));color:var(--soft);font-size:13px}
#footer button,.plain{border:0;background:transparent;padding:9px 4px;color:var(--green);text-decoration:underline;text-underline-offset:3px}
.hero{overflow:hidden;position:relative;padding:clamp(30px,5vw,66px);background:var(--forest);color:var(--white);border-radius:26px;display:grid;grid-template-columns:1.5fr 1fr;align-items:center;gap:20px}
.hero::after{content:"";position:absolute;inset:0;pointer-events:none;background-image:linear-gradient(90deg,transparent 95%,#ffffff0d 95%),linear-gradient(transparent 95%,#ffffff0d 95%);background-size:32px 32px;mask-image:linear-gradient(90deg,transparent 25%,black)}
.hero-main,.hero-art{position:relative;z-index:1}
.eyebrow{font:700 12px var(--mono);letter-spacing:.18em;text-transform:uppercase;color:#60836a;margin:0 0 12px}
.hero .eyebrow{color:var(--lime)}
.hero h1{font-size:clamp(37px,6vw,68px);line-height:1.14;margin:0;font-weight:850;letter-spacing:-.06em}
.hero h1 em{font-style:normal;color:var(--lime)}
.hero p:not(.eyebrow){color:#d4e4d8;margin:18px 0 24px;line-height:1.7}
.hero-art{justify-self:end;border:1px solid #59756a;border-radius:16px;padding:21px 25px 19px;min-width:min(100%,225px);background:#133d35;box-shadow:11px 11px 0 #0a2622;transform:rotate(-3deg)}
.hero-art div{font:700 55px/1 var(--mono);color:var(--lime)}
.hero-art small{color:#d2e1d6;display:block;margin-top:8px}
.art-rule{margin:15px 0;border:0;border-top:1px dashed #7a9689}
.hero-art code{font-size:11px;letter-spacing:.08em;color:#cce0d1}
.primary,.secondary{border:1px solid transparent;min-height:44px;border-radius:10px;padding:10px 17px;font-weight:750;line-height:1.35}
.primary{background:var(--forest);color:white}
.primary:hover{background:var(--forest2)}
.hero .primary{background:var(--lime);color:var(--forest)}
.hero .primary:hover{background:#e4f6b2}
.hero-actions{display:flex;flex-wrap:wrap;gap:8px}
.bank-bar{display:flex;flex-wrap:wrap;justify-content:center;gap:8px;margin:0 auto 16px}
.hero-actions .secondary{background:transparent;border-color:#9fb9aa;color:var(--white)}
.hero-actions .secondary:hover{background:var(--forest2)}
.secondary{background:var(--white);border-color:#b9cab9}
.secondary:hover{background:#edf1e4}
.home-heading{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:28px 0 13px}
h1,h2,h3,p{overflow-wrap:anywhere}
.home-heading h2,.page-head h1,.dialog-heading h2{margin:0}
.home-heading small,.muted{color:var(--soft)}
.mode-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.mode-card{display:flex;flex-direction:column;text-align:left;padding:20px;background:var(--white);border:1px solid var(--line);border-radius:16px;min-height:149px}
.mode-card:hover,.hit:hover{border-color:#789d80;background:#fbfdf0}
.mode-icon{font:700 13px var(--mono);background:#e7efd6;color:var(--green);border-radius:7px;padding:6px 8px;margin-bottom:14px}
.mode-card strong{font-size:20px}
.mode-card span:last-child{font-size:14px;color:var(--soft);margin-top:8px;line-height:1.55}
.page-head{display:flex;justify-content:space-between;align-items:flex-end;gap:12px;margin-bottom:18px}
.page-head p:last-child{margin:8px 0 0;color:var(--soft)}
.page-head h1{font-size:clamp(29px,5vw,42px);line-height:1.15}
.panel{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:clamp(17px,4vw,32px);min-width:0}
.frame{max-width:790px;margin:auto}
.question-meta{display:flex;align-items:center;flex-wrap:wrap;gap:8px;margin-bottom:12px;font-size:13px;color:var(--soft)}
.tag{display:inline-block;font-size:12px;font-weight:750;border-radius:6px;padding:5px 8px;background:#e7eed9;color:#284c39}
.counter{font:700 14px var(--mono);margin-left:auto}
.question-title{font-size:clamp(20px,3.5vw,29px);line-height:1.5;margin:0 0 18px}
.prompt-image{display:block;max-width:100%;max-height:540px;height:auto;width:auto;object-fit:contain;margin:0 auto}
.figure-link{display:block;width:fit-content;max-width:100%;margin:0 auto 18px;background:white;border:1px solid var(--line);border-radius:12px;overflow:hidden}
.figure-link.symbol img{width:72px}
.options{display:grid;gap:8px}
.option{border:1px solid var(--line);border-radius:11px;padding:9px 12px;min-height:52px;display:flex;align-items:center;gap:12px;line-height:1.5;background:#fffefa;cursor:pointer}
.option:hover{border-color:#96af93}
.option.selected{background:#edf4e4;border-color:#759b78}
.option.correct{background:#e7f2dc;border-color:#82a778}
.option.wrong{background:#fcebe7;border-color:#c87b6a}
.option.locked{cursor:default}
.option input{width:18px;height:18px;accent-color:#286448;flex:none}
.letter{min-width:22px;color:var(--soft);font:700 14px var(--mono)}
.form-field{display:grid;gap:7px}
.form-field label{font-weight:700}
.field,.form-field input,.form-field select,textarea{display:block;width:100%;border:1px solid #a6bda9;border-radius:10px;padding:11px 13px;color:var(--ink);background:white}
textarea{min-height:124px;resize:vertical;line-height:1.55}
.blank-grid{display:grid;gap:11px;grid-template-columns:repeat(auto-fit,minmax(160px,1fr))}
.controls{display:flex;align-items:center;gap:8px;margin-top:17px;flex-wrap:wrap}
.controls .push{margin-left:auto}
.feedback{margin-top:16px;padding:16px;border-radius:12px;background:#eaf1e0;border-left:4px solid #638961;line-height:1.65}
.feedback.wrong{background:#fcf0e7;border-color:#a85c40}
.feedback h3{margin:0 0 7px;font-size:17px}
.feedback p{margin:6px 0;white-space:pre-wrap}
.statline{display:flex;gap:12px;flex-wrap:wrap;color:var(--soft);font-size:13px;margin:14px 0 0}
.exam-picks{display:grid;grid-template-columns:1fr 1fr;gap:15px;margin-bottom:17px}
.exam-summary{display:flex;justify-content:space-between;gap:12px;align-items:center;margin:0 0 12px;color:var(--soft);font-size:14px}
.progress{height:5px;background:#dfe6da;border-radius:9px;margin-bottom:14px;overflow:hidden}
.progress span{display:block;height:100%;background:#4a7e5e}
.jump{display:flex;gap:6px;flex-wrap:wrap;margin-top:12px}
.jump button{border:1px solid #c7d5c8;border-radius:7px;background:white;min-width:40px;min-height:37px}
.jump button.done{background:#deeed4}
.jump button[aria-current=step]{outline:2px solid var(--green);outline-offset:1px}
details{margin-top:12px}
summary{cursor:pointer;font-weight:650;color:var(--green)}
.score{padding:22px 24px;background:var(--forest);color:white;border-radius:16px;margin-bottom:14px}
.score strong{display:block;font:800 clamp(43px,8vw,66px)/1.05 var(--mono);color:var(--lime);margin:9px 0}
.score p{margin:0}
.score small{color:#daeadc}
.review{margin-top:12px}
.review summary{line-height:1.5}
.review .feedback{margin-top:9px}
.self{display:flex;gap:8px;flex-wrap:wrap;margin-top:11px}
.self button[aria-pressed=true]{background:var(--forest);color:white}
.search-form{display:flex;gap:8px}
.search-form input{flex:1;min-width:0}
.filters{display:flex;gap:7px;flex-wrap:wrap;margin-top:14px}
.practice-modes{margin-bottom:12px}
.original .figure-link{margin:10px auto 0}
.source-first{margin-bottom:22px}
.source-first h2{font-size:1.05rem;margin:0 0 10px}
button.figure-link{padding:0}
#source-viewer{width:min(960px,calc(100% - 16px));max-width:none;padding:12px}
.source-viewer-image{display:block;width:100%;height:auto;margin-top:10px}
.chip{border:1px solid #b9cab9;background:white;border-radius:99px;min-height:36px;padding:4px 12px}
.chip[aria-pressed=true]{background:var(--forest);border-color:var(--forest);color:white}
.hits{display:grid;gap:8px;margin-top:10px}
.hit{display:grid;grid-template-columns:90px 1fr;gap:11px;text-align:left;width:100%;padding:13px 14px;border-radius:10px;border:1px solid var(--line);background:white;line-height:1.5}
.hit small{display:block;color:var(--soft);font:12px var(--mono);margin-top:4px;overflow-wrap:anywhere}
.hit .tag{justify-self:start;align-self:start}
dialog{width:min(560px,calc(100% - 24px));border:1px solid var(--line);border-radius:18px;color:var(--ink);background:var(--white);padding:22px;line-height:1.7}
dialog::backdrop{background:#081e19a0}
.dialog-heading{display:flex;align-items:center;justify-content:space-between;gap:12px}
@media(max-width:600px){.header{padding:0 12px}.header-inner{min-height:58px}.brand small{display:none}nav button{padding:9px 8px;font-size:14px}.logo{width:30px;height:30px}.logo span{left:18px}.brand{gap:6px;font-size:17px}#app,#footer{width:calc(100% - 24px)}#app{margin-top:16px}.hero{grid-template-columns:1fr;gap:23px;padding:24px;border-radius:18px}.hero-art{justify-self:stretch;transform:none;box-shadow:none;display:flex;align-items:center;gap:12px;padding:10px 13px}.hero-art div{font-size:30px}.hero-art small{margin:0}.hero-art hr,.hero-art code{display:none}.home-heading{margin-top:20px}.mode-grid{grid-template-columns:1fr;gap:8px}.mode-card{min-height:0;padding:13px;display:grid;grid-template-columns:42px 1fr;column-gap:9px}.mode-card .mode-icon{grid-row:span 2;align-self:center;text-align:center;margin:0}.mode-card strong{font-size:17px}.mode-card span:last-child{margin:3px 0 0}.exam-picks{grid-template-columns:1fr}.hit{grid-template-columns:63px 1fr;gap:6px}}
@media(prefers-reduced-motion:no-preference){button{transition:background-color .15s,border-color .15s}}