:root{
  --forest:#142319;
  --forest-2:#203328;
  --canvas:#edf3f6;
  --workbench:#f4f1e9;
  --paper:#fcfaf5;
  --ink:#18232d;
  --muted:#66727b;
  --line:#d5ddd9;
  --coral:#e45a38;
  --green:#3f7f58;
  --blue:#48688c;
  --ochre:#9a6b18;
  --trae-bg:#f3f3f3;
  --trae-panel:#f7f7f7;
  --trae-white:#fefefe;
  --trae-line:#e2e2e2;
  --trae-text:#202020;
  --purple:#c8c4f7;
  --purple-deep:#6965d8;
  --sans:"PingFang SC","Noto Sans CJK SC","Microsoft YaHei",sans-serif;
  --serif:"Songti SC","STSong",serif;
  --mono:"SFMono-Regular","Cascadia Code","JetBrains Mono",monospace;
  --ease:cubic-bezier(.22,1,.36,1);
}
[hidden]{display:none!important}

*{box-sizing:border-box}
html{scroll-behavior:smooth;background:var(--forest);-webkit-text-size-adjust:100%}
body{margin:0;color:var(--ink);background:var(--canvas);font:16px/1.7 var(--sans)}
a{color:inherit;text-decoration:none}
button,textarea{font:inherit}
button{color:inherit;cursor:pointer}
button,a{touch-action:manipulation}
button:disabled{cursor:not-allowed}
:focus-visible{outline:3px solid #d6a84c;outline-offset:3px}

/* Course entry */
.site-head{
  height:58px;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;
  padding:0 clamp(18px,3vw,42px);background:var(--forest);border-bottom:1px solid #34463a;color:#f2f5f1
}
.brand{min-height:44px;display:flex;align-items:center;gap:11px;font-size:.84rem;font-weight:850;letter-spacing:.01em}
.brand i{width:12px;height:12px;background:var(--coral);transform:rotate(45deg)}
.head-course{color:#aebcb3;font-size:.78rem;font-weight:700}
.head-action{justify-self:end;min-height:44px;display:flex;align-items:center;color:#f3f6f3;font-size:.78rem;font-weight:800}
.course-home main{overflow:hidden;background:var(--canvas)}
.course-hero{
  min-height:610px;display:grid;grid-template-columns:minmax(0,1.08fr) minmax(380px,.92fr);gap:clamp(40px,7vw,108px);
  align-items:center;width:min(1380px,calc(100% - 48px));margin:auto;padding:clamp(74px,8vw,120px) clamp(10px,2vw,30px)
}
.section-kicker{margin:0 0 18px;color:var(--blue);font-size:.76rem;font-weight:850;letter-spacing:.13em}
.hero-copy h1{max-width:820px;margin:0;color:var(--ink);font-size:clamp(3rem,5.3vw,5.8rem);line-height:1.02;letter-spacing:-.06em;text-wrap:balance}
.hero-copy h1 span{color:var(--coral)}
.hero-lead{max-width:700px;margin:30px 0 0;color:#56646e;font-size:clamp(1rem,1.2vw,1.18rem);line-height:1.85}
.hero-actions{display:flex;flex-wrap:wrap;align-items:center;gap:22px;margin-top:34px}
.button{min-height:44px;display:inline-flex;align-items:center;justify-content:center;padding:0 20px;border:1px solid transparent;border-radius:4px;font-size:.86rem;font-weight:820}
.button.primary{background:var(--forest);color:#f6f3eb}
.button.primary:hover{background:#24382b}
.button.quiet{border-color:#bfc9c4;background:transparent;color:#304238}
.button.quiet:hover{border-color:#73897c;background:#f5f7f5}
.text-link{min-height:44px;display:flex;align-items:center;color:#3c5145;font-size:.85rem;font-weight:760}
.hero-workflow{align-self:center;border-top:4px solid var(--forest);background:var(--paper);box-shadow:0 20px 56px rgba(24,35,45,.09)}
.workflow-head{display:flex;justify-content:space-between;align-items:center;padding:20px 24px;border-bottom:1px solid var(--line);font-size:.78rem}
.workflow-head span{color:var(--muted)}
.workflow-head b{color:var(--green)}
.hero-workflow ol{list-style:none;margin:0;padding:8px 24px 18px}
.hero-workflow li{display:grid;grid-template-columns:42px minmax(0,1fr);gap:16px;align-items:center;min-height:80px;border-bottom:1px solid #e3e7e3}
.hero-workflow li:last-child{border-bottom:0}
.hero-workflow li>b{font:800 .78rem var(--mono);color:#93a098}
.hero-workflow strong,.hero-workflow small{display:block}
.hero-workflow strong{font-size:.98rem}
.hero-workflow small{margin-top:3px;color:var(--muted);font-size:.78rem}

.route-section,.future-routes{padding:clamp(72px,8vw,120px) max(24px,calc((100vw - 1320px)/2));background:var(--paper)}
.section-head{display:grid;grid-template-columns:minmax(0,1fr) minmax(320px,520px);gap:48px;align-items:end;padding-bottom:30px;border-bottom:1px solid var(--line)}
.section-head h2{margin:0;font-size:clamp(2rem,3.5vw,3.6rem);line-height:1.08;letter-spacing:-.045em}
.section-head>p{margin:0;color:var(--muted)}
.route-list{border-bottom:1px solid var(--line)}
.route-row{
  display:grid;grid-template-columns:64px minmax(340px,1fr) minmax(220px,.58fr) 142px;gap:28px;align-items:center;
  min-height:190px;padding:28px 0;border-top:1px solid var(--line)
}
.route-row:hover{background:linear-gradient(90deg,color-mix(in srgb,var(--route) 5%,transparent),transparent 66%)}
.route-no{align-self:start;padding-top:5px;color:var(--route);font:850 .8rem var(--mono)}
.route-main>span{color:var(--route);font-size:.74rem;font-weight:850;letter-spacing:.06em}
.route-main h3{max-width:720px;margin:7px 0 10px;font-size:clamp(1.35rem,2vw,2rem);line-height:1.25;letter-spacing:-.025em}
.route-main p{max-width:700px;margin:0;color:var(--muted);font-size:.9rem}
.route-output{display:grid;gap:4px;padding-left:22px;border-left:1px solid var(--line)}
.route-output span{margin-bottom:5px;color:#849087;font-size:.72rem}
.route-output b{font-size:.82rem;font-weight:750}
.route-actions{display:grid;gap:7px}
.route-actions .button{width:100%;padding-inline:12px}

.learning-system{
  display:grid;grid-template-columns:minmax(300px,.78fr) minmax(0,1.22fr);gap:clamp(40px,8vw,120px);
  padding:clamp(78px,9vw,136px) max(24px,calc((100vw - 1320px)/2));background:var(--forest);color:#eef4ef
}
.system-intro .section-kicker{color:#9db7a5}
.system-intro h2{margin:0;font-size:clamp(2.1rem,4vw,4.2rem);line-height:1.12;letter-spacing:-.045em}
.system-steps{display:grid;align-content:center}
.system-steps div{display:grid;grid-template-columns:160px 1fr;gap:28px;padding:23px 0;border-top:1px solid #385043}
.system-steps div:last-child{border-bottom:1px solid #385043}
.system-steps b{color:#f8f4ea}
.system-steps p{margin:0;color:#aebdb4}
.future-routes{background:#e6edf0}
.future-board{display:grid;grid-template-columns:repeat(3,1fr);margin-top:34px;border-top:1px solid #cbd5d6;border-left:1px solid #cbd5d6}
.future-board span{min-height:98px;display:flex;align-items:center;padding:24px;border-right:1px solid #cbd5d6;border-bottom:1px solid #cbd5d6;font-weight:780}
.site-foot{min-height:110px;display:flex;justify-content:space-between;align-items:center;gap:24px;padding:28px max(24px,calc((100vw - 1320px)/2));background:var(--forest);color:#d6e0d8;font-size:.78rem}
.site-foot span{color:#91a097}

/* Lesson shell */
.lesson-page{height:100dvh;overflow:hidden;background:var(--forest)}
.lesson-app{height:100dvh;display:grid;grid-template-rows:58px minmax(0,1fr) 76px}
.lesson-head{
  display:grid;grid-template-columns:230px minmax(0,1fr) auto 120px;align-items:center;gap:22px;
  padding:0 24px;border-bottom:1px solid #34463a;background:var(--forest);color:#eff4f0
}
.lesson-heading{min-width:0;line-height:1.25}
.lesson-heading small{display:block;color:#899a90;font-size:.66rem;font-weight:800;letter-spacing:.07em}
.lesson-heading strong{display:block;overflow:hidden;margin-top:3px;color:#dce6df;font-size:.78rem;text-overflow:ellipsis;white-space:nowrap}
.lesson-mode{display:flex;padding:3px;border:1px solid #395044;border-radius:5px}
.lesson-mode a{min-height:44px;display:flex;align-items:center;padding:0 13px;border-radius:3px;color:#91a198;font-size:.72rem;font-weight:780}
.lesson-mode a.is-active{background:#f4f1e9;color:var(--forest)}
.lesson-progress{text-align:right;line-height:1.2}
.lesson-progress span{display:block;color:#829289;font-size:.66rem}
.lesson-progress b{display:block;margin-top:4px;font:800 .78rem var(--mono)}
.mobile-view-switch{display:none}
.lesson-workspace{min-height:0;display:grid;grid-template-columns:minmax(340px,31%) minmax(0,69%)}
.story-stage{min-height:0;padding:16px;background:#e5edf0;border-right:1px solid #cbd5d7}
.story-frame{height:100%;position:relative;overflow:hidden;background:var(--paper)}
.story-label{position:absolute;z-index:3;left:30px;top:22px;color:#77878d;font-size:.65rem;font-weight:850;letter-spacing:.1em}
.story-label::before{content:"";display:inline-block;width:7px;height:7px;margin-right:8px;border-radius:50%;background:var(--blue)}
.story-slides{height:100%}
.story-slide{position:absolute;inset:0;display:none;overflow:auto;padding:clamp(76px,7vw,108px) clamp(28px,3.5vw,54px) 86px}
.story-slide.is-active{display:grid;align-content:center;animation:storyIn .2s var(--ease) both}
@keyframes storyIn{from{opacity:0;transform:translateX(10px)}to{opacity:1;transform:none}}
.story-slide::after{
  content:attr(data-number);position:absolute;right:-18px;bottom:-76px;color:rgba(24,35,45,.04);
  font:900 clamp(12rem,22vw,24rem)/1 var(--sans);pointer-events:none
}
.story-slide .kicker{position:relative;z-index:1;display:flex;align-items:center;gap:10px;margin:0 0 18px;color:var(--accent);font-size:.75rem;font-weight:850;letter-spacing:.08em}
.story-slide .kicker::before{content:"";width:24px;height:2px;background:currentColor}
.story-slide h1,.story-slide h2{position:relative;z-index:1;max-width:11em;margin:0;font-size:clamp(2.05rem,3vw,3.55rem);line-height:1.12;letter-spacing:-.045em;text-wrap:balance}
.story-slide p{position:relative;z-index:1;max-width:34em;margin:24px 0 0;color:#5d6b64;font-size:clamp(.95rem,1.05vw,1.08rem);line-height:1.8}
.story-slide .proof{position:relative;z-index:1;margin-top:30px;padding-top:18px;border-top:1px solid var(--line);color:var(--green);font-size:.78rem;font-weight:760}
.story-source{position:absolute;z-index:4;left:30px;right:30px;bottom:18px;display:flex;justify-content:space-between;gap:18px;padding-top:12px;border-top:1px solid var(--line);font-size:.65rem}
.story-source span{color:#8a9690}
.story-source b{overflow:hidden;color:#4f6056;text-align:right;text-overflow:ellipsis;white-space:nowrap}

.simulator-stage{min-width:0;min-height:0;display:grid;grid-template-rows:auto minmax(0,1fr);gap:10px;padding:10px 14px 14px;background:#dde5e3}
.coach-bar{
  min-height:54px;display:grid;grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:14px;
  padding:8px 10px 8px 12px;border:1px solid #c6d0ca;border-radius:8px;background:#f8faf7;box-shadow:0 5px 14px rgba(32,51,40,.07)
}
.coach-step{min-width:72px;height:32px;display:grid;place-items:center;padding:0 10px;border-radius:4px;background:var(--accent);color:#fff;font-size:.68rem;font-weight:850;letter-spacing:.06em}
.coach-copy{min-width:0;line-height:1.35}
.coach-copy strong,.coach-copy span{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.coach-copy strong{color:#243129;font-size:.78rem}
.coach-copy span{margin-top:3px;color:#69766e;font-size:.68rem}
.hint-button{min-height:44px;padding:0 14px;border:1px solid #cbd5cf;border-radius:4px;background:#fff;color:#31513c;font-size:.7rem;font-weight:800}
.hint-button:hover{border-color:var(--green);background:#eef6f0}

.trae-window{
  min-width:0;min-height:0;position:relative;display:grid;grid-template-columns:190px minmax(0,1fr);
  overflow:hidden;border:1px solid #ccd2cf;border-radius:12px;background:var(--trae-bg);box-shadow:0 14px 34px rgba(34,49,40,.13);color:var(--trae-text)
}
.trae-sidebar{min-height:0;display:flex;flex-direction:column;padding:13px 9px 10px;background:#f5f5f5;border-right:1px solid #e8e8e8}
.window-icons{height:28px;display:flex;align-items:center;gap:8px;padding:0 7px}
.window-icons i{width:10px;height:10px;border-radius:50%;background:#d0d0d0}
.window-icons span{margin-left:auto;color:#555;font-size:.72rem}
.trae-modes{display:grid;grid-template-columns:1.1fr .9fr 1fr;margin-top:8px;padding:2px;border-radius:6px;background:#e4e4e4}
.trae-modes button{min-height:44px;border:0;border-radius:5px;background:transparent;font-size:.75rem}
.trae-modes button.is-active{background:#fff;box-shadow:0 1px 2px rgba(0,0,0,.09)}
.trae-modes button:disabled{cursor:default;opacity:1}
.trae-actions{display:grid;gap:3px;margin-top:13px}
.trae-actions button{min-height:44px;display:grid;grid-template-columns:18px 1fr auto;align-items:center;gap:8px;padding:0 10px;border:0;border-radius:5px;background:transparent;text-align:left;font-size:.75rem}
.trae-actions button:hover,.trae-actions button.is-active{background:#e6e6e6}
.trae-actions i{font-style:normal}
.trae-actions small{color:#888;font-size:.58rem}
.task-list{margin-top:16px}
.task-list>div{display:flex;justify-content:space-between;padding:0 8px;color:#929292;font-size:.65rem}
.task-list .task-default,.task-list .task-name{width:100%;min-height:44px;display:flex;align-items:center;justify-content:flex-start;gap:8px;padding:0 9px;border-radius:5px;color:#222;font-size:.7rem}
.task-list .task-name{padding-left:26px}
.task-list .task-name.is-active{background:#e5e5e5;font-weight:760}
.sim-profile{display:flex;align-items:center;gap:7px;margin-top:auto;padding:8px 5px 0;font-size:.68rem}
.sim-profile>span{width:27px;height:27px;display:grid;place-items:center;border-radius:6px;background:linear-gradient(145deg,#8ba3a1,#dbc2b7);font-size:.62rem}
.sim-profile small{padding:2px 5px;border-radius:3px;background:#e4e4e4;color:#666;font-size:.56rem}

.trae-main{min-width:0;min-height:0;position:relative;margin:5px 5px 5px 0;overflow:hidden;border-radius:10px;background:var(--trae-white)}
.home-view,.chat-view{position:absolute;inset:0}
.home-view{display:grid;align-content:center;justify-items:center;padding:30px}
.trae-wordmark{display:flex;align-items:center;gap:13px;margin-bottom:28px;font-size:clamp(1.8rem,3vw,2.7rem);font-weight:650;letter-spacing:-.035em}
.book-icon{width:34px;height:29px;position:relative;border:3px solid #222;border-radius:6px 6px 8px 8px}
.book-icon::before{content:"";position:absolute;left:50%;top:-3px;bottom:-3px;width:3px;background:#222;transform:translateX(-50%)}
.composer-shell{width:min(700px,88%);position:relative}
.composer{position:relative;min-height:246px;padding:15px 17px 58px;border:1px solid #dedede;border-radius:12px;background:#fff;box-shadow:0 5px 13px rgba(0,0,0,.06)}
.composer textarea{width:100%;height:176px;resize:none;border:0;outline:0;background:transparent;color:#222;font-size:.79rem;line-height:1.6}
.composer textarea::placeholder{color:#aaa}
.composer-tools{position:absolute;left:9px;right:9px;bottom:5px;display:flex;align-items:center;gap:3px}
.composer-tools button{width:44px;min-height:44px;border:0;border-radius:6px;background:transparent;font-size:.85rem}
.composer-tools button:hover{background:#f0f0f0}
.composer-mode{margin-left:auto;padding:0 8px;color:#666;font-size:.68rem}
.composer-tools .send-button{background:var(--purple);color:#fff;font-size:1rem;font-weight:900}
.composer-tools .send-button:not(:disabled):hover{background:var(--purple-deep)}
.composer-tools .send-button:disabled{opacity:.55}
.composer-error,.recovery-strip{display:flex;gap:10px;align-items:flex-start;margin-top:8px;padding:9px 11px;border:1px solid #e3b9ac;border-radius:5px;background:#fff1ed;color:#7d3321;font-size:.68rem}
.composer-error b,.recovery-strip b{white-space:nowrap}
.contract-helper{margin-top:8px;padding:14px;border:1px solid #becbc4;border-radius:6px;background:#f8faf8;color:#2b4034}
.contract-helper>header{display:flex;justify-content:space-between;align-items:flex-end;gap:16px;padding-bottom:11px;border-bottom:1px solid #dce4df}
.contract-helper>header small,.contract-helper>header b{display:block}
.contract-helper>header small{color:#78877f;font-size:.58rem;font-weight:850;letter-spacing:.08em}
.contract-helper>header b{margin-top:2px;font-size:.78rem}
.contract-helper>header>span{color:#805124;font-size:.63rem;font-weight:850}
.contract-parts{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;margin-top:10px;background:#dce4df}
.contract-parts>div{position:relative;min-height:118px;display:grid;grid-template-columns:auto 1fr;grid-template-rows:auto 1fr;column-gap:8px;padding:10px;background:#fff}
.contract-parts i{grid-row:1/3;color:#9aa79f;font:.72rem var(--mono);font-style:normal}
.contract-parts b{font-size:.7rem}
.contract-parts span{color:#758179;font-size:.59rem;line-height:1.5;overflow-wrap:anywhere}
.contract-parts em{position:absolute;right:8px;top:8px;color:#9a5d35;font-size:.56rem;font-style:normal;font-weight:850}
.contract-parts>div.is-complete{background:#edf6ef}
.contract-parts>div.is-complete i,.contract-parts>div.is-complete em{color:#3f7f58}
.contract-helper-action{display:flex;justify-content:space-between;align-items:center;gap:14px;margin-top:11px}
.contract-helper-action>span{color:#748178;font-size:.59rem}
.contract-helper-action button{min-height:44px;padding:0 13px;border:0;border-radius:4px;background:var(--forest);color:#f7f4ec;font-size:.65rem;font-weight:800}
.context-row{min-height:46px;display:flex;align-items:center;gap:10px;padding:0 15px;border-radius:0 0 10px 10px;background:#f4f4f4;font-size:.68rem}
.context-row button{min-height:44px;border:0;background:transparent}
.local-source{color:#333}
.folder-chip{align-items:center;gap:5px;padding:4px 8px;border-radius:4px;background:#e5ede8;color:#355b44}
.folder-chip:not([hidden]){display:inline-flex}
.folder-picker{position:absolute;z-index:12;left:8px;right:8px;bottom:50px;padding:9px;border:1px solid #dcdcdc;border-radius:8px;background:#fff;box-shadow:0 12px 26px rgba(0,0,0,.13)}
.folder-picker>span{display:block;padding:4px 7px;color:#999;font-size:.62rem}
.folder-picker button{width:100%;min-height:58px;display:grid;grid-template-columns:26px minmax(0,1fr) auto;gap:8px;align-items:center;padding:7px;border:0;border-radius:5px;background:transparent;text-align:left}
.folder-picker button:hover{background:#f2f2f2}
.folder-picker i{font-style:normal}
.folder-picker b,.folder-picker small{display:block}
.folder-picker b{font-size:.72rem}
.folder-picker small{margin-top:2px;color:#999;font-size:.61rem}
.folder-picker em{color:#777;font-size:.62rem;font-style:normal}
.quick-actions{display:flex;flex-wrap:wrap;justify-content:center;gap:7px;margin-top:18px}
.quick-actions button{min-height:44px;padding:0 14px;border:1px solid #dfdfdf;border-radius:8px;background:#fff;font-size:.68rem}
.quick-actions button:hover{background:#f4f4f4}

.chat-view{display:grid;grid-template-rows:48px minmax(0,1fr)}
.chat-view>header{display:flex;justify-content:center;align-items:center;border-bottom:1px solid #eee;font-size:.72rem}
.chat-view>header span{position:absolute;right:18px;color:#999;font-size:.61rem}
.messages{min-height:0;overflow:auto;padding:24px clamp(20px,4vw,62px)}
.conversation{width:min(740px,100%);margin:auto}
.message{margin-bottom:22px}
.user-message{max-width:80%;margin-left:auto;padding:12px 15px;border-radius:12px 12px 3px 12px;background:#f0f0f0;font-size:.72rem}
.user-message p{margin:0;white-space:pre-line}
.attachment-chip{display:flex;align-items:center;gap:8px;margin-bottom:9px;padding:8px 10px;border:1px solid #dedede;border-radius:6px;background:#fff}
.attachment-chip b,.attachment-chip small{display:block}
.attachment-chip small{color:#999;font-size:.59rem}
.assistant-message{font-size:.72rem}
.assistant-name{display:flex;align-items:center;gap:7px;margin-bottom:8px}
.assistant-name i{width:22px;height:22px;display:grid;place-items:center;border-radius:5px;background:#222;color:#fff;font-size:.6rem;font-style:normal}
.assistant-message>p{margin:0;color:#4f4f4f}
.plan-box{margin-top:12px;overflow:hidden;border:1px solid #e1e1e1;border-radius:7px}
.plan-box header,.execution-box header{display:flex;justify-content:space-between;align-items:center;padding:9px 11px;background:#f7f7f7;font-size:.68rem}
.plan-box ol{margin:0;padding:10px 14px 10px 31px;color:#555}
.plan-box li{padding:3px 0}
.plan-box li.is-added{color:var(--green);font-weight:760}
.plan-warning{margin-top:10px;padding:10px 12px;border-left:3px solid var(--ochre);background:#faf5e9;color:#654a17}
.plan-warning b{font-size:.69rem}
.plan-warning p{margin:3px 0 0;font-size:.66rem}
.plan-actions{display:flex;flex-wrap:wrap;gap:7px;margin-top:10px}
.plan-actions button{min-height:44px;padding:0 14px;border-radius:5px;font-size:.68rem;font-weight:780}
.quiet-action{border:1px solid #d4d4d4;background:#fff}
.primary-action{border:0;background:#222;color:#fff}
.plan-recovery{margin-top:9px}
.execution-box{margin-top:12px;overflow:hidden;border:1px solid #e1e1e1;border-radius:7px}
.exec-row{min-height:34px;display:flex;align-items:center;gap:9px;padding:0 11px;color:#999}
.exec-row i{width:17px;height:17px;display:grid;place-items:center;border:1px solid #c6c6c6;border-radius:50%;font-size:.58rem;font-style:normal}
.exec-row.is-done{color:var(--green)}
.exec-row.is-done i{border-color:var(--green);background:var(--green);color:#fff}
.result-box{margin-top:15px}
.result-box>p{color:#3d4a43}
.output-progress{display:flex;align-items:center;justify-content:space-between;min-height:34px;margin:8px 0;padding:0 10px;border-radius:5px;background:#f3f3f3;color:#6e756f;font-size:.62rem;font-weight:800}
.output-progress.is-complete{background:#e9f3ec;color:#347048}
.output-files{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}
.file-card{min-height:82px;display:grid;grid-template-columns:40px minmax(0,1fr) auto;gap:10px;align-items:center;padding:10px;border:1px solid #dedede;border-radius:7px;background:#fff;text-align:left}
.file-card:hover{border-color:#aeb9b2;background:#fafafa}
.file-card.is-primary{border-color:#aebbb3}
.file-card.is-reviewed{border-color:#8eb29a;background:#f1f7f3}
.file-card i{width:36px;height:42px;display:grid;place-items:center;border-radius:4px;background:#eaf0ec;color:#46604d;font-size:.58rem;font-style:normal;font-weight:850}
.file-card b,.file-card small{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.file-card b{font-size:.68rem}
.file-card small{margin-top:3px;color:#999;font-size:.58rem}
.file-card em{color:#496654;font-size:.56rem;font-style:normal;font-weight:800;white-space:nowrap}

.artifact-pane{position:absolute;z-index:20;inset:0;display:grid;grid-template-columns:minmax(0,1fr) 320px;background:#f2f3f2}
.artifact-main{min-width:0;overflow:auto;padding:20px 26px 30px}
.artifact-main>header{display:flex;justify-content:space-between;align-items:center;min-height:44px;margin-bottom:12px}
.artifact-main>header b{font-size:.76rem}
.artifact-main>header button{width:44px;min-height:44px;border:0;border-radius:5px;background:#e5e5e5;font-size:1.1rem}
.artifact-paper{width:min(760px,100%);margin:auto;background:#fff;box-shadow:0 7px 22px rgba(0,0,0,.08)}
.artifact-review{overflow:auto;padding:24px;border-left:1px solid #d7d7d7;background:#fff}
.artifact-review>span,.transfer-panel>span{color:#89948e;font-size:.62rem;font-weight:800;letter-spacing:.08em}
.artifact-review h3{margin:8px 0 7px;font-size:1.2rem}
.artifact-review>p{margin:0 0 14px;color:#777;font-size:.68rem}
.validation-list label{min-height:49px;display:flex;align-items:flex-start;gap:9px;padding:10px 0;border-bottom:1px solid #eee;font-size:.68rem}
.validation-list input{width:18px;height:18px;margin:2px 0 0;accent-color:var(--green)}
.artifact-actions{display:grid;gap:8px;margin-top:16px}
.artifact-actions button,.transfer-panel button{min-height:44px;border-radius:5px;font-size:.68rem;font-weight:800}
.preview-button{border:1px solid #bdcbc1;background:#edf5ef;color:#31513c}
.preview-button:disabled{opacity:.48}
.download-button{border:0;background:#222;color:#fff}
.transfer-panel{margin-top:24px;padding-top:19px;border-top:3px solid var(--green)}
.transfer-panel h4{margin:7px 0;font-size:.95rem}
.transfer-panel p{margin:0;color:#66726b;font-size:.68rem}
.transfer-panel>b{display:block;margin:11px 0;color:var(--green);font-size:.7rem}
.transfer-panel button{width:100%;border:0;background:var(--green);color:#fff}
.transfer-panel small{display:block;margin-top:7px;color:#89938d;font-size:.61rem}

.report-artifact{padding:34px;color:#202a24;font-size:.76rem}
.report-artifact>small{color:#87918b;font-size:.61rem;letter-spacing:.08em}
.report-artifact h1{margin:9px 0 8px;font-size:2rem;line-height:1.16}
.report-artifact .intro{margin:0;color:#6b756f}
.artifact-metrics{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;margin:24px 0;background:#d8ded9}
.artifact-metrics div{padding:14px;background:#f4f6f4}
.artifact-metrics span,.artifact-metrics b{display:block}
.artifact-metrics span{color:#7d8982;font-size:.61rem}
.artifact-metrics b{margin-top:2px;font-size:1.5rem}
.artifact-table-wrap{overflow:auto}
.artifact-table{width:100%;border-collapse:collapse}
.artifact-table th,.artifact-table td{padding:9px;border-bottom:1px solid #e3e6e4;text-align:left;white-space:nowrap}
.artifact-table th{font-size:.66rem}
.artifact-finding{margin-top:20px;padding:14px;background:#e7f1e9;color:#315d3d}
.source-links{display:flex;flex-wrap:wrap;gap:7px;margin-top:15px}
.source-links a{display:inline-flex;align-items:center;min-height:44px;padding:0 12px;border:1px solid #d2d8d4;color:#315d3d;font-size:.67rem;font-weight:800;text-decoration:none}
.source-links a:hover{border-color:var(--forest);background:#eef3ef}
.weekly-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-top:24px}
.weekly-block{padding-top:12px;border-top:3px solid var(--forest)}
.weekly-block.risk{border-color:var(--ochre)}
.weekly-block h2{margin:0 0 10px;font-size:.88rem}
.weekly-block ul{margin:0;padding-left:18px}
.prototype-toolbar{display:flex;gap:7px;margin:24px 0 15px}
.prototype-toolbar button{min-height:44px;padding:0 13px;border:1px solid #d2d8d4;border-radius:4px;background:#fff;font-size:.67rem;font-weight:760}
.prototype-toolbar button.is-active{border-color:var(--forest);background:var(--forest);color:#fff}
.learning-tabs{display:flex;gap:7px;margin:24px 0 15px}
.learning-tabs button{min-height:44px;padding:0 13px;border:1px solid #d2d8d4;border-radius:4px;background:#fff;font-size:.67rem;font-weight:760}
.learning-tabs button.is-active{border-color:var(--forest);background:var(--forest);color:#fff}
.learning-panel{margin-top:4px}
.concept-grid{display:grid;grid-template-columns:1fr 1fr;gap:1px;background:#dce3df}
.concept-card{min-height:124px;padding:14px;background:#fff}
.concept-card header{display:flex;justify-content:space-between;gap:10px}
.concept-card header b{font-size:.74rem}
.concept-card header span{color:#65756b;font-size:.6rem}
.concept-card p{margin:14px 0 8px;font-size:.68rem;line-height:1.6}
.concept-card small{color:var(--green);font-size:.6rem;font-weight:820}
.learning-analogy{display:grid;grid-template-columns:120px 1fr;gap:14px;margin-top:14px;padding:14px;background:#eef3ef;font-size:.68rem}
.learning-plan{list-style:none;margin:0;padding:0;border-top:1px solid #dde3df}
.learning-plan li{display:grid;grid-template-columns:62px 1fr minmax(120px,.68fr);gap:12px;padding:12px 0;border-bottom:1px solid #dde3df;font-size:.66rem}
.learning-plan em{color:var(--green);font-style:normal}
.teaching-tabs{display:flex;gap:7px;margin:24px 0 15px}
.teaching-tabs button{min-height:44px;padding:0 13px;border:1px solid #d2d8d4;border-radius:4px;background:#fff;font-size:.67rem;font-weight:760}
.teaching-tabs button.is-active{border-color:var(--forest);background:var(--forest);color:#fff}
.teaching-panel{margin-top:4px}
.time-proof{display:flex;justify-content:space-between;gap:16px;margin-top:14px;padding:13px;background:#edf5ef;color:#315d3d;font-size:.68rem}
.teaching-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:#dce3df}
.teaching-cards article{min-height:126px;padding:14px;background:#fff}
.teaching-cards header{display:flex;justify-content:space-between;gap:10px}
.teaching-cards header span{color:var(--blue);font-size:.62rem;font-weight:820}
.teaching-cards p{margin:16px 0 8px;font-size:.68rem}
.teaching-cards small{color:#68766d;font-size:.59rem}
.asset-pools{display:grid;grid-template-columns:1fr 1fr;gap:1px;background:#dce3df}
.asset-pools article{min-height:116px;display:grid;gap:8px;padding:14px;background:#fff}
.asset-pools span{font-size:.68rem}
.asset-pools small{color:var(--green);font-size:.59rem}
.office-preview section{margin-top:26px}
.office-preview h2{margin:0 0 10px;font-size:1rem}
.office-preview ol{padding-left:22px}
.office-preview li{margin:8px 0}
.document-note{padding:18px;background:#f2f5f2}
.document-note b{display:block;margin:12px 0;color:#315d3d;font-size:1.35rem}
.sheet-tabs{display:flex;justify-content:space-between;align-items:center;margin-top:24px;padding:9px 12px;border-bottom:2px solid #4b765a;background:#edf3ef;color:#315d3d;font-size:.65rem}
.sheet-preview .artifact-table{font-size:.62rem}
.slide-outline{display:grid;gap:1px;margin-top:24px;background:#dce3df}
.slide-outline section{min-height:100px;display:grid;grid-template-columns:52px 1fr;gap:16px;margin:0;padding:16px;background:#fff}
.slide-outline i{width:42px;height:42px;display:grid;place-items:center;border-radius:4px;background:#e8eeea;color:#315d3d;font-style:normal;font-weight:850}
.slide-outline h2{margin:0 0 6px}
.slide-outline p{margin:0 0 7px}
.slide-outline small{color:#557063;letter-spacing:0}
.markdown-preview pre{overflow:auto;margin-top:24px;padding:20px;background:#f3f5f3;font:0.7rem/1.75 var(--mono);white-space:pre-wrap}
.prototype-list{border-top:1px solid #dde2de}
.prototype-task{display:grid;grid-template-columns:minmax(180px,1fr) 80px 70px 70px;gap:10px;padding:11px 0;border-bottom:1px solid #e2e6e3}
.prototype-task span:nth-child(2){color:var(--blue);font-weight:760}
.prototype-task.is-risk span:nth-child(2){color:#a04931}
.unresolved{margin-top:22px;padding:14px;background:#f6f0e3}
.unresolved b{display:block;margin-bottom:7px}
.unresolved ul{margin:0;padding-left:18px}

.lesson-controls{
  display:grid;grid-template-columns:minmax(240px,1fr) auto minmax(220px,1fr);align-items:center;gap:20px;
  padding:0 24px;border-top:1px solid #34463a;background:var(--forest);color:#e4ece6
}
.step-route{display:flex;align-items:center;gap:5px}
.step-route>span{width:28px;min-height:44px;display:grid;place-items:center}
.step-route>span::after{content:"";width:100%;height:3px;background:#425449}
.step-route>span.is-active::after{height:5px;background:var(--accent)}
.step-route>span.is-done::after{background:var(--green)}
.control-copy{max-width:440px;text-align:center;line-height:1.35}
.control-copy b,.control-copy span{display:block}
.control-copy b{font-size:.73rem}
.control-copy span{margin-top:3px;color:#8fa096;font-size:.64rem}
.control-actions{justify-self:end;display:flex;gap:7px}
.control-actions a,.control-actions button{min-height:44px;display:flex;align-items:center;padding:0 13px;border:1px solid #405449;border-radius:4px;background:transparent;color:#dfe8e1;font-size:.68rem;font-weight:800}

.is-guided{position:relative!important;z-index:40!important;box-shadow:0 0 0 3px var(--accent),0 0 0 8px color-mix(in srgb,var(--accent) 22%,transparent)!important}
.is-guided::after{content:"点这里";position:absolute;z-index:60;right:-5px;top:-29px;padding:5px 8px;border-radius:3px;background:var(--accent);color:#fff;font-size:.58rem;font-weight:850;line-height:1;white-space:nowrap;pointer-events:none}
.is-guided.is-guide-reminding{animation:guideReminder 6s ease-in-out infinite}
@keyframes guideReminder{0%,13.333%,26.666%,40%,100%{filter:none;outline:0 solid color-mix(in srgb,var(--accent) 76%,transparent);outline-offset:7px}6.666%,20%,33.333%{filter:brightness(1.08);outline:4px solid color-mix(in srgb,var(--accent) 76%,transparent);outline-offset:7px}}
.guide-bump{animation:guideBump .32s var(--ease) both}
@keyframes guideBump{50%{transform:scale(1.035)}}
.lesson-page.is-practice .is-guided{box-shadow:none!important;animation:none}
.lesson-page.is-practice .is-guided::after{display:none}
.lesson-page.is-practice.practice-hint .is-guided{box-shadow:0 0 0 3px var(--accent),0 0 0 8px color-mix(in srgb,var(--accent) 22%,transparent)!important}
.lesson-page.is-practice.practice-hint .is-guided::after{display:block;content:"提示"}

.live-preview{width:min(1120px,calc(100vw - 40px));height:min(800px,calc(100dvh - 40px));padding:0;overflow:hidden;border:1px solid #aebbb3;border-radius:10px;background:#eef1ef;box-shadow:0 28px 70px rgba(11,28,18,.32)}
.live-preview::backdrop{background:rgba(12,28,18,.68)}
.live-preview-shell{height:100%;display:grid;grid-template-rows:58px minmax(0,1fr)}
.live-preview-shell>header{display:flex;align-items:center;justify-content:space-between;padding:0 12px 0 18px;border-bottom:1px solid #d1d8d3;background:#f7faf7}
.live-preview-shell>header>div{display:flex;align-items:center;gap:8px}
.live-preview-shell small{color:#77857d;font-size:.61rem}
.live-preview-shell b{font-size:.74rem}
.live-preview-shell button{min-height:44px;padding:0 13px;border:1px solid #d0d8d3;border-radius:4px;background:#fff;font-size:.67rem;font-weight:800}
.live-preview-shell button:first-child{background:var(--forest);color:#fff}
.live-preview-shell [data-close-preview]{width:40px;padding:0;font-size:1.1rem}
.live-preview iframe{width:100%;height:100%;border:0;background:#f1f1f1}
.toast{position:fixed;z-index:200;left:50%;bottom:92px;translate:-50% 10px;max-width:min(520px,calc(100vw - 32px));padding:10px 14px;border-radius:4px;background:#fff;color:#222;box-shadow:0 8px 24px rgba(0,0,0,.18);opacity:0;pointer-events:none;font-size:.72rem;transition:opacity .16s var(--ease),translate .16s var(--ease)}
.toast.is-on{translate:-50% 0;opacity:1}

@media (max-width:1100px){
  .course-hero{grid-template-columns:1fr;gap:54px}
  .hero-workflow{width:min(720px,100%)}
  .route-row{grid-template-columns:48px minmax(280px,1fr) minmax(190px,.55fr)}
  .route-actions{grid-column:2/-1;display:flex}
  .route-actions .button{width:auto}
  .lesson-head{grid-template-columns:180px minmax(0,1fr) auto}
  .lesson-progress{display:none}
  .lesson-workspace{grid-template-columns:minmax(300px,34%) minmax(0,66%)}
  .trae-window{grid-template-columns:164px minmax(0,1fr)}
  .artifact-pane{grid-template-columns:minmax(0,1fr) 280px}
}

@media (max-width:760px){
  html,body{max-width:100%;overflow-x:hidden}
  .site-head{grid-template-columns:1fr auto;padding:0 16px}
  .head-course{display:none}
  .course-hero{width:100%;min-height:auto;padding:66px 20px 78px}
  .hero-copy h1{font-size:clamp(2.65rem,13vw,4rem)}
  .hero-actions{align-items:flex-start;flex-direction:column;gap:10px}
  .section-head{grid-template-columns:1fr;gap:20px}
  .route-section,.future-routes{padding:72px 20px}
  .route-row{grid-template-columns:36px minmax(0,1fr);gap:16px;padding:28px 0}
  .route-main,.route-output,.route-actions{grid-column:2}
  .route-output{padding:15px 0 0;border-top:1px solid var(--line);border-left:0}
  .route-actions{display:flex;flex-wrap:wrap}
  .learning-system{grid-template-columns:1fr;padding:76px 20px}
  .system-steps div{grid-template-columns:1fr;gap:7px}
  .future-board{grid-template-columns:1fr 1fr}
  .site-foot{align-items:flex-start;flex-direction:column}

  .lesson-page{height:auto;min-height:100dvh;overflow-x:hidden;overflow-y:auto}
  .lesson-app{width:100%;max-width:100vw;min-width:0;min-height:100dvh;height:auto;display:grid;grid-template-rows:58px 48px minmax(0,1fr) 72px;overflow-x:hidden}
  .lesson-head{width:100%;min-width:0;position:sticky;z-index:80;top:0;grid-template-columns:minmax(0,1fr) auto;padding:0 14px}
  .lesson-brand{font-size:0;gap:0}
  .lesson-brand i{width:13px;height:13px}
  .lesson-heading{display:none}
  .lesson-mode{justify-self:end}
  .lesson-mode a{padding:0 10px}
  .mobile-view-switch{width:100%;min-width:0;position:sticky;z-index:75;top:58px;display:grid;grid-template-columns:1fr 1fr;padding:5px;background:#dce5e7;border-bottom:1px solid #c8d2d3}
  .mobile-view-switch button{min-height:44px;border:0;border-radius:3px;background:transparent;color:#5e6d66;font-size:.76rem;font-weight:820}
  .mobile-view-switch button.is-active{background:var(--paper);color:var(--forest)}
  .lesson-workspace{width:100%;max-width:100%;min-width:0;display:block;min-height:calc(100dvh - 178px)}
  .story-stage,.simulator-stage{display:none}
  .story-stage.is-mobile-active,.simulator-stage.is-mobile-active{display:block}
  .story-stage{min-height:calc(100dvh - 178px);padding:10px;border-right:0}
  .story-frame{min-height:calc(100dvh - 198px)}
  .story-slide{padding:80px 24px 92px}
  .story-slide h1,.story-slide h2{font-size:clamp(2rem,9vw,3rem)}
  .story-slide p{font-size:1rem}
  .story-source{left:24px;right:24px}
  .simulator-stage{width:100%;max-width:100%;min-width:0;min-height:calc(100dvh - 178px);padding:8px;background:#dce4e2}
  .coach-bar{position:sticky;z-index:65;top:106px;grid-template-columns:auto minmax(0,1fr);border-radius:4px}
  .coach-step{min-width:58px}
  .coach-copy strong{font-size:.78rem;overflow-wrap:anywhere}
  .coach-copy span{font-size:.7rem;white-space:normal}
  .hint-button{grid-column:1/-1;width:100%}
  .trae-window{width:100%;max-width:100%;min-width:0;min-height:690px;display:block;border-radius:7px}
  .trae-sidebar{min-height:auto;display:grid;grid-template-columns:1fr auto;padding:8px;border-right:0;border-bottom:1px solid #e4e4e4}
  .window-icons,.task-list,.sim-profile{display:none}
  .trae-modes{margin:0}
  .trae-actions{display:flex;margin:0 0 0 8px}
  .trae-actions button{width:44px;grid-template-columns:1fr;padding:0;text-align:center}
  .trae-actions button span,.trae-actions button small{display:none}
  .trae-main{width:100%;max-width:100%;min-width:0;min-height:625px;margin:0;border-radius:0}
  .home-view{align-content:start;padding:52px 14px 24px}
  .trae-wordmark{font-size:1.75rem}
  .composer-shell{width:100%}
  .composer{min-height:300px}
  .composer textarea{height:230px;font-size:.88rem;line-height:1.62}
  .contract-helper>header,.contract-helper-action{align-items:flex-start;flex-direction:column}
  .contract-parts{grid-template-columns:1fr 1fr}
  .contract-helper-action button{width:100%}
  .folder-picker{position:relative;left:auto;right:auto;bottom:auto;margin-top:8px}
  .quick-actions{justify-content:flex-start}
  .quick-actions button{font-size:.76rem}
  .messages{padding:18px 14px}
  .user-message{max-width:94%;font-size:.82rem}
  .assistant-message{font-size:.82rem}
  .chat-view>header{font-size:.82rem}
  .plan-warning p,.plan-actions button,.exec-row,.file-card b,.result-box>p{font-size:.76rem}
  .output-files{grid-template-columns:1fr}
  .file-card{grid-template-columns:40px minmax(0,1fr)}
  .file-card em{grid-column:2}
  .artifact-pane{width:100%;max-width:100%;min-width:0;position:relative;inset:auto;display:block;min-height:625px;overflow:hidden}
  .artifact-main{width:100%;max-width:100%;min-width:0;padding:12px}
  .artifact-main>header b{min-width:0;overflow-wrap:anywhere}
  .artifact-paper,.artifact-table-wrap{max-width:100%;min-width:0}
  .artifact-review{width:100%;max-width:100%;min-width:0;border-top:1px solid #d7d7d7;border-left:0;padding:20px}
  .artifact-review>p,.validation-list label,.transfer-panel p{font-size:.8rem}
  .report-artifact{padding:24px 18px;font-size:.8rem}
  .report-artifact h1{font-size:1.75rem}
  .artifact-metrics{grid-template-columns:1fr}
  .weekly-grid{grid-template-columns:1fr}
  .prototype-task{grid-template-columns:minmax(145px,1fr) 70px}
  .prototype-task span:nth-child(3),.prototype-task span:nth-child(4){display:none}
  .learning-tabs{overflow:auto}
  .learning-tabs button{flex:0 0 auto}
  .concept-grid,.learning-analogy,.learning-plan li{grid-template-columns:1fr}
  .teaching-tabs{overflow:auto}
  .teaching-tabs button{flex:0 0 auto}
  .teaching-cards,.asset-pools{grid-template-columns:1fr}
  .time-proof{align-items:flex-start;flex-direction:column}
  .lesson-controls{width:100%;max-width:100%;min-width:0;position:sticky;z-index:70;bottom:0;grid-template-columns:minmax(0,1fr) auto;min-height:72px;padding:0 12px}
  .step-route{overflow:hidden}
  .step-route>span{width:22px}
  .control-copy{display:none}
  .control-actions a{display:none}
  .control-actions button{padding:0 11px}
  .live-preview{width:100vw;height:100dvh;max-width:none;max-height:none;border:0;border-radius:0}
  .live-preview-shell>header{padding-left:12px}
  .live-preview-shell small{display:none}
}

@media (max-width:420px){
  .hero-workflow ol{padding-inline:16px}
  .workflow-head{padding-inline:16px}
  .future-board{grid-template-columns:1fr}
  .lesson-mode a{padding:0 8px;font-size:.68rem}
  .trae-modes button{font-size:.68rem}
  .live-preview-shell>header>div:first-child{min-width:0}
  .live-preview-shell b{overflow:hidden;max-width:120px;text-overflow:ellipsis;white-space:nowrap}
}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{scroll-behavior:auto!important;animation:none!important;transition:none!important}
}