/* Child workbench visual system: paper / graphite / orbit */
:root{--paper-bg:#f4efe7;--paper-card:#fffdfa;--paper-ink:#25231f;--paper-muted:#777166;--paper-line:#ded6ca;--paper-accent:#9a7843;--paper-accent-2:#46745c;--paper-shadow:0 24px 80px rgba(72,53,29,.09);--studio-radius:24px}
:where([hidden]){display:none!important}
:root[data-theme="graphite"]{--paper-bg:#101316;--paper-card:#181c21;--paper-ink:#f4f1ea;--paper-muted:#9ea6aa;--paper-line:#2c353b;--paper-accent:#d3f36b;--paper-accent-2:#82c8ff;--paper-shadow:0 28px 90px rgba(0,0,0,.3)}
:root[data-theme="orbit"]{--paper-bg:#eef2ff;--paper-card:#fff;--paper-ink:#1c2140;--paper-muted:#66708e;--paper-line:#dbe1f5;--paper-accent:#635bff;--paper-accent-2:#23a899;--paper-shadow:0 24px 80px rgba(56,70,135,.12)}
body{background:radial-gradient(circle at 84% -18%,color-mix(in srgb,var(--paper-card) 90%,transparent),var(--paper-bg) 52%,color-mix(in srgb,var(--paper-bg) 82%,#cfc5b7));color:var(--paper-ink);transition:background .35s ease,color .35s ease}
.shell{width:min(1440px,calc(100% - 56px));padding:28px 0 72px}.brand{align-items:center}.brand strong,.brand small{display:block}.brand small{font-size:11px;font-weight:500;color:var(--paper-muted);margin-top:1px}.topbar{padding:5px 0 22px}.topbar-actions{display:flex;align-items:center;gap:16px}.workspace-status{font-size:11px;color:var(--paper-muted);display:flex;align-items:center;gap:7px}.workspace-status i,.studio-live i{width:7px;height:7px;border-radius:50%;background:var(--paper-accent-2);box-shadow:0 0 0 4px color-mix(in srgb,var(--paper-accent-2) 18%,transparent)}
.theme-switcher{display:flex;gap:3px;padding:3px;border:1px solid var(--paper-line);border-radius:12px;background:color-mix(in srgb,var(--paper-card) 76%,transparent)}.theme-switcher button{border:0;background:transparent;color:var(--paper-muted);font:inherit;font-size:11px;border-radius:8px;padding:5px 8px;cursor:pointer}.theme-switcher button.is-active{background:var(--paper-ink);color:var(--paper-bg)}
.workbench-layout{display:grid;grid-template-columns:220px minmax(0,1fr);gap:34px;align-items:start}.side-nav{position:sticky;top:18px;min-height:680px;border-right:1px solid var(--paper-line);padding:12px 24px 12px 0;display:flex;flex-direction:column}.profile-chip{display:flex;align-items:center;gap:11px;padding:10px 0 24px;border-bottom:1px solid var(--paper-line)}.profile-avatar{display:grid;place-items:center;width:38px;height:38px;border-radius:13px;background:color-mix(in srgb,var(--paper-accent) 20%,var(--paper-card));color:var(--paper-accent);font-weight:800}.profile-chip strong,.profile-chip small{display:block}.profile-chip small{font-size:11px;color:var(--paper-muted);margin-top:2px}.nav-label{margin:27px 0 10px;color:var(--paper-muted);font-size:10px;letter-spacing:.16em;text-transform:uppercase}.side-links{display:grid;gap:5px}.side-link{display:grid;grid-template-columns:27px 1fr;grid-template-rows:auto auto;column-gap:9px;text-align:left;border:1px solid transparent;border-radius:14px;background:transparent;color:var(--paper-ink);padding:10px 11px;cursor:pointer}.side-link>span{grid-row:1 / span 2;display:grid;place-items:center;width:25px;height:25px;border-radius:8px;background:color-mix(in srgb,var(--paper-accent) 12%,var(--paper-card));color:var(--paper-accent);font-weight:800}.side-link b{font-size:13px}.side-link small{font-size:11px;color:var(--paper-muted);margin-top:1px}.side-link:hover,.side-link.is-active{background:color-mix(in srgb,var(--paper-accent) 12%,var(--paper-card));border-color:color-mix(in srgb,var(--paper-accent) 30%,var(--paper-line))}.side-note{margin-top:auto;padding:14px;border-radius:16px;background:color-mix(in srgb,var(--paper-accent) 9%,var(--paper-card));border:1px solid color-mix(in srgb,var(--paper-accent) 18%,var(--paper-line))}.side-note strong{display:block;font-size:13px}.side-note p{color:var(--paper-muted);font-size:11px;margin:4px 0 0}
.home-content{min-width:0}.home-hero{display:flex;justify-content:space-between;align-items:center;min-height:260px;padding:38px 28px 26px;border-bottom:1px solid var(--paper-line)}.home-hero h1{font-size:clamp(38px,5.4vw,76px);line-height:1.03;letter-spacing:-.065em;margin:0 0 16px;color:var(--paper-ink)}.home-hero h1 em{font-style:normal;color:var(--paper-accent)}.hero-orbit{position:relative;width:190px;height:190px;margin-right:7vw}.orbit-core{position:absolute;inset:58px;display:grid;place-items:center;border-radius:34px;background:var(--paper-accent);color:var(--paper-bg);font-weight:900;font-size:48px;box-shadow:0 15px 40px color-mix(in srgb,var(--paper-accent) 35%,transparent)}.hero-orbit i{position:absolute;inset:25px;border:1px solid color-mix(in srgb,var(--paper-accent) 38%,transparent);border-radius:50%;transform:rotate(25deg)}.hero-orbit i:nth-child(3){inset:8px;transform:rotate(-55deg)}.hero-orbit i:nth-child(4){inset:42px;transform:rotate(80deg)}
.idea-launch,.signal-card,.log-preview{background:color-mix(in srgb,var(--paper-card) 92%,transparent);border:1px solid var(--paper-line);border-radius:var(--studio-radius);box-shadow:var(--paper-shadow)}.idea-launch{display:grid;grid-template-columns:.72fr 1.28fr;gap:32px;padding:25px 28px;margin-top:22px}.studio-kicker{display:block;color:var(--paper-accent);font-size:10px;letter-spacing:.15em;font-weight:800;text-transform:uppercase}.launch-copy h2{font-size:25px;margin:8px 0}.launch-copy p{font-size:13px;color:var(--paper-muted);max-width:300px;margin:0}.launch-input textarea{min-height:106px;resize:vertical;background:color-mix(in srgb,var(--paper-bg) 52%,var(--paper-card));border-color:var(--paper-line)}.launch-foot{display:flex;justify-content:space-between;align-items:center;margin-top:12px;color:var(--paper-muted);font-size:11px}.spark-dot{display:inline-block;width:7px;height:7px;border-radius:50%;background:var(--paper-accent-2);margin-right:7px}.launch-foot .primary{background:var(--paper-accent);color:var(--paper-bg);box-shadow:0 8px 20px color-mix(in srgb,var(--paper-accent) 25%,transparent)}
.home-lower{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:18px}.signal-card,.log-preview{padding:22px 24px}.card-heading h2{color:var(--paper-ink);font-size:18px}.card-index,.studio-log-count{font-size:10px;color:var(--paper-muted);border:1px solid var(--paper-line);border-radius:99px;padding:4px 8px}.direction-mini-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:7px;margin:20px 0 14px}.direction-mini-grid span{display:grid;gap:5px;place-items:center;padding:10px 4px;border:1px solid var(--paper-line);border-radius:12px;color:var(--paper-muted);font-size:11px}.direction-mini-grid b{font-size:16px;color:var(--paper-accent)}.signal-card>.subtle{font-size:12px}.log-preview-row{display:flex;align-items:center;gap:12px;border-top:1px solid var(--paper-line);padding-top:19px;margin-top:15px}.log-preview-dot{width:9px;height:9px;border-radius:50%;background:var(--paper-line)}.log-preview-row strong{font-size:13px}.log-preview-row p{font-size:12px;color:var(--paper-muted);margin:4px 0 0}
.route-context{display:flex;align-items:center;gap:9px;font-size:12px;color:var(--paper-muted)}.route-dot{color:var(--paper-line)}.back-button{font-size:12px}.route-card{max-width:1100px;margin:4vh auto 0;padding:26px;background:transparent;border:0;box-shadow:none}.engine-route,.ask-route{background:transparent;border:0;box-shadow:none;padding:0;max-width:1250px}.primary{background:var(--paper-accent);color:var(--paper-bg)}.quiet,.text-button{color:var(--paper-muted)}input,textarea{background:var(--paper-card);border-color:var(--paper-line);color:var(--paper-ink)}
.direction-stage{max-width:1120px;margin:3vh auto 0}.direction-intro{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:22px}.direction-intro h2{font-size:clamp(30px,4vw,52px);line-height:1.05;letter-spacing:-.055em;margin:8px 0 10px}.direction-intro p{color:var(--paper-muted);font-size:13px;margin:0}.idea-pill{min-width:220px;padding:13px 15px;border:1px solid var(--paper-line);border-radius:14px;background:color-mix(in srgb,var(--paper-card) 82%,transparent)}.idea-pill span,.idea-pill strong{display:block}.idea-pill span{font-size:10px;color:var(--paper-muted);letter-spacing:.12em}.idea-pill strong{font-size:13px;margin-top:4px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.direction-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:10px}.direction-card{min-height:205px;display:flex;flex-direction:column;align-items:flex-start;text-align:left;gap:13px;padding:17px;border:1px solid var(--paper-line);border-radius:20px;background:color-mix(in srgb,var(--paper-card) 88%,transparent);color:var(--paper-ink);cursor:pointer;transition:transform .22s ease,border-color .22s ease,background .22s ease}.direction-card:hover{transform:translateY(-3px);border-color:color-mix(in srgb,var(--paper-accent) 58%,var(--paper-line))}.direction-card.is-selected{background:color-mix(in srgb,var(--paper-accent) 13%,var(--paper-card));border-color:var(--paper-accent);box-shadow:0 14px 35px color-mix(in srgb,var(--paper-accent) 16%,transparent)}.direction-glyph{display:grid;place-items:center;width:38px;height:38px;border-radius:13px;background:color-mix(in srgb,var(--paper-accent) 13%,var(--paper-card));color:var(--paper-accent);font-size:20px;font-weight:800}.direction-card-body{display:grid;gap:4px}.direction-card-body strong{font-size:17px}.direction-card-body small{font-size:12px;color:var(--paper-ink)}.direction-card-body em{font-size:11px;line-height:1.5;color:var(--paper-muted);font-style:normal}.direction-check{margin-top:auto;align-self:flex-end;color:var(--paper-muted);font-size:15px}.direction-card.is-selected .direction-check{color:var(--paper-accent)}.direction-foot{display:flex;align-items:center;justify-content:flex-end;gap:18px;padding:20px 2px}.direction-selected{font-size:12px;color:var(--paper-muted)}.studio-primary{border:1px solid var(--paper-accent);border-radius:12px;background:var(--paper-accent);color:var(--paper-bg);padding:11px 17px;font:inherit;font-weight:700;cursor:pointer}.studio-primary:disabled{opacity:.4;cursor:not-allowed}
.studio-shell{display:grid;grid-template-columns:205px minmax(420px,1fr) 300px;gap:15px;min-height:720px}.studio-context,.studio-canvas-area,.studio-inspector>section{border:1px solid var(--paper-line);border-radius:20px;background:color-mix(in srgb,var(--paper-card) 92%,transparent);box-shadow:var(--paper-shadow)}.studio-context{padding:19px 16px;display:flex;flex-direction:column}.studio-context-top{display:flex;justify-content:space-between;align-items:center;gap:7px}.studio-live{font-size:9px;color:var(--paper-muted);display:flex;align-items:center;gap:5px}.studio-live i{width:6px;height:6px}.studio-context h2{font-size:19px;line-height:1.2;letter-spacing:-.03em;margin:23px 0 7px;overflow-wrap:anywhere}.studio-context-copy{font-size:11px;color:var(--paper-muted);margin:0 0 22px}.studio-context-block{display:grid;gap:5px;border-top:1px solid var(--paper-line);padding:15px 0}.studio-context-block span{font-size:10px;color:var(--paper-muted)}.studio-context-block strong{font-size:14px}.studio-context-block small{font-size:11px;color:var(--paper-muted);line-height:1.5}.studio-back{margin-top:auto;border:0;background:transparent;color:var(--paper-muted);font:inherit;font-size:11px;text-align:left;padding:8px 0;cursor:pointer}.studio-back:hover{color:var(--paper-accent)}.studio-canvas-area{min-width:0;padding:15px;background:color-mix(in srgb,var(--paper-bg) 50%,var(--paper-card));border-style:dashed;box-shadow:none}.studio-breadcrumb{display:flex;gap:8px;align-items:center;color:var(--paper-muted);font-size:11px;padding:3px 4px 14px}.studio-breadcrumb b{color:var(--paper-line);font-weight:400}.studio-breadcrumb strong{color:var(--paper-ink)}.studio-canvas{min-width:0}.studio-inspector{display:grid;grid-template-rows:minmax(0,1.15fr) minmax(260px,.85fr);gap:15px;min-width:0}.studio-inspector>section{padding:16px;min-width:0}.studio-panel-head{display:flex;justify-content:space-between;align-items:start;gap:8px}.studio-panel-head h3{font-size:16px;margin:6px 0 0}.studio-ai-badge{font-size:9px;color:var(--paper-accent-2);border:1px solid color-mix(in srgb,var(--paper-accent-2) 35%,var(--paper-line));padding:4px 6px;border-radius:99px;white-space:nowrap}.studio-ai-messages{display:grid;gap:8px;max-height:300px;overflow:auto;margin:18px 0;padding-right:2px}.studio-ai-bubble{max-width:91%;padding:9px 10px;border-radius:13px;font-size:11px;line-height:1.55;white-space:pre-wrap}.studio-ai-bubble.assistant{background:color-mix(in srgb,var(--paper-accent) 10%,var(--paper-card));color:var(--paper-ink)}.studio-ai-bubble.child{justify-self:end;background:color-mix(in srgb,var(--paper-accent-2) 13%,var(--paper-card))}.studio-ai-form{display:grid;gap:8px;border-top:1px solid var(--paper-line);padding-top:13px}.studio-ai-form textarea{min-height:62px;resize:vertical;font-size:12px}.studio-ai-form .studio-primary{justify-self:end;padding:8px 11px;font-size:11px}.studio-log-panel{min-height:0}.studio-log-list{display:grid;gap:10px;max-height:350px;overflow:auto;margin-top:15px}.studio-empty{color:var(--paper-muted);font-size:11px;line-height:1.6}.studio-log-row{display:grid;grid-template-columns:9px 1fr;gap:8px;font-size:11px;line-height:1.5}.studio-log-dot{width:7px;height:7px;border:2px solid var(--paper-accent);border-radius:50%;margin-top:5px}.studio-log-row div{color:var(--paper-muted)}
:root[data-theme="graphite"] .studio-canvas-area{background:#0d1013}:root[data-theme="orbit"] .orbit-core{border-radius:50%}
@media(max-width:1080px){.studio-shell{grid-template-columns:180px minmax(360px,1fr)}.studio-inspector{grid-column:1 / -1;grid-template-columns:1fr 1fr;grid-template-rows:auto}.studio-ai-messages{max-height:180px}.studio-log-list{max-height:180px}}
@media(max-width:820px){.shell{width:min(100% - 28px,680px)}.workbench-layout{display:block}.side-nav{position:static;min-height:0;border-right:0;border-bottom:1px solid var(--paper-line);padding:0 0 12px;margin-bottom:12px}.profile-chip{padding:0 0 12px;border-bottom:0}.nav-label,.side-note{display:none}.side-links{display:flex;gap:5px;overflow:auto}.side-link{min-width:112px;padding:8px}.side-link small{display:none}.home-hero{min-height:220px;padding:32px 10px 22px}.home-hero h1{font-size:clamp(36px,10vw,58px)}.hero-orbit{width:130px;height:130px;margin-right:2vw}.orbit-core{inset:40px;font-size:32px}.hero-orbit i{inset:18px}.hero-orbit i:nth-child(3){inset:5px}.hero-orbit i:nth-child(4){inset:29px}.idea-launch{grid-template-columns:1fr;gap:18px;padding:20px}.home-lower{grid-template-columns:1fr}.topbar-actions{gap:7px}.workspace-status{display:none}
.direction-intro{display:grid;align-items:start}.direction-grid{grid-template-columns:repeat(2,1fr)}.direction-card{min-height:165px}.direction-card:last-child{grid-column:1 / -1}.studio-shell{grid-template-columns:1fr;min-height:0}.studio-context{min-height:0}.studio-context-block{display:none}.studio-back{margin-top:18px}.studio-canvas-area{order:1}.studio-inspector{order:2;grid-template-columns:1fr}.studio-ai-messages,.studio-log-list{max-height:220px}}
@media(max-width:480px){.shell{width:calc(100% - 20px);padding-top:13px}.topbar{align-items:flex-start}.brand small{display:none}.theme-switcher{display:none!important}.home-hero{padding-left:2px;padding-right:2px}.hero-orbit{display:none}.launch-foot{align-items:flex-end;gap:9px}.direction-grid{gap:7px}.direction-card{padding:13px;border-radius:16px}.direction-card-body em{font-size:10px}.direction-foot{justify-content:space-between}.studio-shell{gap:10px}.studio-canvas-area{padding:9px}.studio-context{padding:14px}.studio-context h2{margin-top:14px}.studio-inspector>section{padding:13px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;transition:none!important;animation:none!important}}
.brand strong,.profile-chip strong,.launch-copy h2,.card-heading h2{color:var(--paper-ink)}
.direction-intro{display:grid;grid-template-columns:minmax(0,1fr) 220px;grid-template-areas:"kicker idea" "title idea" "copy subject";align-items:start;gap:0 24px}.direction-intro>.studio-kicker{grid-area:kicker}.direction-intro>h2{grid-area:title}.direction-intro>p{grid-area:copy}.direction-intro>.idea-pill{grid-area:idea}.direction-intro>.subject-pill{grid-area:subject}
.subject-card{display:grid;align-content:start}.subject-lead{max-width:520px}.subject-flow{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin:18px 0 6px}.subject-flow span{display:grid;gap:5px;padding:10px 8px;border:1px solid var(--paper-line);border-radius:12px;color:var(--paper-muted);font-size:11px}.subject-flow b{font-size:16px;color:var(--paper-accent)}.subject-entry{justify-self:start;margin-top:8px;padding-left:0}.subject-pill{min-width:220px;padding:13px 15px;border:1px solid color-mix(in srgb,var(--paper-accent-2) 28%,var(--paper-line));border-radius:14px;background:color-mix(in srgb,var(--paper-accent-2) 7%,var(--paper-card))}.subject-pill span,.subject-pill strong,.subject-pill small{display:block}.subject-pill span{font-size:10px;color:var(--paper-accent-2);letter-spacing:.12em}.subject-pill strong{font-size:13px;margin-top:4px}.subject-pill small{font-size:11px;color:var(--paper-muted);margin-top:3px}.studio-subject-context{display:grid;gap:8px;margin:14px 0 15px;padding:11px 12px;border:1px solid color-mix(in srgb,var(--paper-accent-2) 25%,var(--paper-line));border-radius:14px;background:color-mix(in srgb,var(--paper-accent-2) 6%,var(--paper-card))}.studio-subject-context .studio-panel-head{align-items:center}.studio-subject-context .studio-panel-head strong{font-size:12px;margin-top:4px;display:block}.studio-subject-context p{font-size:11px;line-height:1.5;color:var(--paper-muted);margin:0}.studio-subject-status{font-size:9px;color:var(--paper-accent-2);border:1px solid color-mix(in srgb,var(--paper-accent-2) 35%,var(--paper-line));padding:4px 6px;border-radius:99px;white-space:nowrap}.studio-evidence-empty{padding:8px 9px;border-radius:10px;background:color-mix(in srgb,var(--paper-card) 76%,transparent);color:var(--paper-muted);font-size:10px}.studio-log-body{display:grid;gap:3px}.studio-log-meta{display:flex;flex-wrap:wrap;align-items:center;gap:5px}.studio-log-kind,.studio-log-subject,.studio-log-subject-code{font-size:9px;border-radius:99px;padding:2px 6px}.studio-log-kind{color:var(--paper-accent);background:color-mix(in srgb,var(--paper-accent) 12%,var(--paper-card))}.studio-log-kind.ai{color:var(--paper-accent-2);background:color-mix(in srgb,var(--paper-accent-2) 11%,var(--paper-card))}.studio-log-kind.evidence{color:var(--paper-accent-2);border:1px solid color-mix(in srgb,var(--paper-accent-2) 28%,var(--paper-line));background:transparent}.studio-log-subject{color:var(--paper-ink);background:color-mix(in srgb,var(--paper-accent-2) 10%,var(--paper-card))}.studio-log-subject-code{color:var(--paper-muted);border:1px solid var(--paper-line)}.studio-log-dot.ai{border-color:var(--paper-accent-2)}.studio-log-dot.evidence{border-color:var(--paper-accent-2);background:var(--paper-accent-2)}
@media(max-width:820px){.subject-flow{grid-template-columns:repeat(3,1fr)}.subject-pill{min-width:0}.studio-subject-context{margin-top:10px}}
@media(max-width:480px){.subject-flow{gap:5px}.subject-flow span{font-size:10px;padding:8px 6px}.subject-pill{display:none}}
@media(max-width:820px){.direction-intro{grid-template-columns:1fr;grid-template-areas:"kicker" "title" "copy" "idea" "subject";gap:0}.direction-intro>.idea-pill,.direction-intro>.subject-pill{min-width:0;width:100%;margin-top:12px}}
/* 编程助手模式：收起右边的"问下一步"（助手自己有对话框），日志挪到下面，预览变大 */
.studio-shell.is-agent{grid-template-columns:180px minmax(0,1fr)}.studio-shell.is-agent .studio-ai{display:none}.studio-shell.is-agent .studio-inspector{grid-column:1 / -1;grid-template-rows:auto}.studio-shell.is-agent .studio-log-list{max-height:200px}.agent-frame .freeform-columns{grid-template-columns:minmax(250px,.65fr) minmax(420px,1.35fr)}.agent-frame .freeform-iframe{min-height:540px}
.template-card{position:relative}.template-card.is-recommended{border-color:var(--paper-accent);box-shadow:0 0 0 3px color-mix(in srgb,var(--paper-accent) 14%,transparent)}.template-badge{position:absolute;top:8px;right:8px;font-style:normal;font-size:10px;font-weight:800;color:var(--paper-bg);background:var(--paper-accent);border-radius:99px;padding:2px 7px}
@media(max-width:1080px){.studio-shell.is-agent{grid-template-columns:1fr}.agent-frame .freeform-columns{grid-template-columns:1fr}.agent-frame .freeform-iframe{min-height:420px}}
/* 游戏里的数学小题 */
.probe-card{display:grid;gap:8px;padding:12px;border-radius:14px;border:1px solid color-mix(in srgb,var(--paper-accent) 35%,var(--paper-line));background:color-mix(in srgb,var(--paper-accent) 7%,var(--paper-card));font-size:13px}.probe-kicker{font-size:10px;font-weight:800;letter-spacing:.12em;color:var(--paper-accent)}.probe-q{margin:0;line-height:1.6;color:var(--paper-ink)}.probe-row{display:flex;gap:8px;align-items:center}.probe-row input{flex:1;min-width:0;font-size:15px;letter-spacing:0;text-align:left;padding:8px 10px}.probe-out{margin:0;color:var(--paper-muted);line-height:1.6}.probe-out:empty{display:none}.probe-card.right{border-color:var(--paper-accent-2)}.probe-card.right .probe-out{color:var(--paper-ink)}.probe-card.skipped{opacity:.7}
/* 问问：对话是主角，回复用正文颜色；卡片放下面当"对照" */
.ask-frame .ask-messages{max-height:460px;min-height:180px}.ask-frame .ask-message{font-size:14px;line-height:1.65}.ask-frame .ask-message.assistant{color:var(--paper-ink,var(--ink))}.ask-frame .ask-message.thinking{color:var(--paper-muted,var(--muted))}.ask-frame .ask-empty{padding:14px 18px}.ask-frame .ask-empty strong{font-size:14px}
.ask-subjects{display:flex;gap:6px;align-items:center;flex-wrap:wrap;margin-bottom:10px}.ask-subject{font:inherit;font-size:13px;border:1px solid var(--paper-line,var(--line));background:transparent;color:var(--paper-muted,var(--muted));border-radius:99px;padding:5px 13px;cursor:pointer}.ask-subject.on{background:var(--paper-accent,var(--accent));border-color:var(--paper-accent,var(--accent));color:var(--paper-bg,#fff)}.ask-subject-hint{font-size:11px;color:var(--paper-muted,var(--muted));margin-left:4px}
/* 基础学科区 */
.learn-frame{display:grid;gap:16px}.learn-head h2{margin:4px 0 6px;font-size:28px}.learn-head p{margin:0;color:var(--paper-muted,var(--muted))}
.learn-subjects{display:flex;gap:8px}.learn-subject{font:inherit;font-size:15px;font-weight:700;border:1px solid var(--paper-line,var(--line));background:var(--paper-card,#fff);color:var(--paper-ink,var(--ink));border-radius:12px;padding:8px 18px;cursor:pointer}.learn-subject.on{background:var(--paper-accent,var(--accent));border-color:var(--paper-accent,var(--accent));color:var(--paper-bg,#fff)}.learn-subject small{font-size:10px;font-weight:600;margin-left:6px;opacity:.75}.learn-subject[data-pending]{color:var(--paper-muted,var(--muted))}
.learn-body{display:grid;grid-template-columns:minmax(220px,280px) minmax(0,1fr);gap:16px;align-items:start}
.learn-books{display:grid;gap:10px;background:var(--paper-card,#fff);border:1px solid var(--paper-line,var(--line));border-radius:16px;padding:12px}.learn-book-pick{display:grid;gap:6px;font-size:12px;color:var(--paper-muted,var(--muted))}.learn-book-pick select{font:inherit;font-size:14px;padding:8px;border-radius:10px;border:1px solid var(--paper-line,var(--line));background:transparent;color:var(--paper-ink,var(--ink))}
.learn-units{list-style:none;margin:0;padding:0;display:grid;gap:6px;max-height:520px;overflow:auto}.learn-unit{width:100%;text-align:left;font:inherit;display:grid;gap:2px;padding:9px 11px;border-radius:10px;border:1px solid transparent;background:transparent;color:var(--paper-ink,var(--ink));cursor:pointer}.learn-unit span{font-size:11px;color:var(--paper-muted,var(--muted))}.learn-unit b{font-size:14px;font-weight:650}.learn-unit:hover{background:color-mix(in srgb,var(--paper-accent,#8a6d3b) 7%,transparent)}.learn-unit.on{border-color:var(--paper-accent,var(--accent));background:color-mix(in srgb,var(--paper-accent,#8a6d3b) 10%,transparent)}.learn-activities{font-size:12px;color:var(--paper-muted,var(--muted));padding:6px 4px}
.learn-room{display:grid;gap:12px;background:var(--paper-card,#fff);border:1px solid var(--paper-line,var(--line));border-radius:16px;padding:16px;min-height:420px;align-content:start}.learn-empty{display:grid;gap:6px;place-content:center;text-align:center;min-height:300px;color:var(--paper-muted,var(--muted))}.learn-empty strong{color:var(--paper-ink,var(--ink));font-size:17px}.learn-empty p{margin:0}
.learn-room-head span{font-size:12px;color:var(--paper-muted,var(--muted))}.learn-room-head h3{margin:2px 0 0;font-size:24px}.learn-starters{display:flex;gap:8px;flex-wrap:wrap}.learn-messages{max-height:380px;min-height:160px;overflow:auto;display:grid;gap:8px;align-content:start}.learn-messages .ask-message{font-size:14px;line-height:1.65}.learn-messages .ask-message.assistant{color:var(--paper-ink,var(--ink))}
@media(max-width:860px){.learn-body{grid-template-columns:1fr}.learn-units{max-height:240px}}
.learn-zh{margin:2px 0 0;color:var(--paper-muted,var(--muted));font-size:13px}.learn-lessons{display:flex;flex-wrap:wrap;gap:6px;margin-top:8px}.learn-lesson{font:inherit;font-size:12px;border:1px dashed var(--paper-line,var(--line));background:transparent;color:var(--paper-ink,var(--ink));border-radius:8px;padding:4px 9px;cursor:pointer}
.learn-pick{display:grid;gap:10px}.learn-recommend{display:grid;gap:6px}.learn-recommend>span,.learn-others>span{font-size:11px;font-weight:700;letter-spacing:.08em;color:var(--paper-muted,var(--muted))}
.learn-form-go{font:inherit;text-align:left;display:grid;gap:3px;padding:14px 16px;border-radius:14px;border:1.5px solid var(--paper-accent,var(--accent));background:color-mix(in srgb,var(--paper-accent,#8a6d3b) 9%,var(--paper-card,#fff));color:var(--paper-ink,var(--ink));cursor:pointer}.learn-form-go b{font-size:18px}.learn-form-go small{font-size:13px;color:var(--paper-muted,var(--muted))}.learn-form-go.on{background:var(--paper-accent,var(--accent));color:var(--paper-bg,#fff)}.learn-form-go.on small{color:inherit;opacity:.85}
.learn-others{display:flex;flex-wrap:wrap;gap:6px;align-items:center}.learn-form-chip{font:inherit;font-size:13px;border:1px solid var(--paper-line,var(--line));background:transparent;color:var(--paper-ink,var(--ink));border-radius:99px;padding:5px 12px;cursor:pointer}.learn-form-chip.on{background:var(--paper-accent,var(--accent));border-color:var(--paper-accent,var(--accent));color:var(--paper-bg,#fff)}
.learn-lesson{display:inline-flex;gap:6px;align-items:center}.learn-lesson small{font-size:10px;color:var(--paper-accent,var(--accent))}.learn-lesson.on{border-style:solid;border-color:var(--paper-accent,var(--accent));background:color-mix(in srgb,var(--paper-accent,#8a6d3b) 10%,transparent)}.learn-mode-note{font-size:12px}
.learn-unit small{font-size:11px;color:var(--paper-muted,var(--muted));white-space:nowrap;overflow:hidden;text-overflow:ellipsis}