:root{color-scheme:light;--bg:#f3f8fc;--surface:#ffffff;--ink:#18364b;--muted:#526b7b;--line:#d1e3ee;--tint:#e4f2fa;--accent:#176999;--display:'Songti SC','STSong','SimSun',serif}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:24px}body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.75 'PingFang SC','Microsoft YaHei',sans-serif;-webkit-font-smoothing:antialiased}body:has(dialog[open]){overflow:hidden}button,input,select{font:inherit;color:inherit}button,a{touch-action:manipulation}button,a,input,select{outline-offset:4px}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid var(--accent)}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.6}a{color:inherit;text-underline-offset:5px}button{min-height:44px}img{max-width:100%}[hidden]{display:none!important}.sr-only{position:absolute;clip:rect(0,0,0,0);width:1px;height:1px;overflow:hidden}.skip{position:absolute;left:10px;top:-80px;padding:12px;background:var(--surface);z-index:20}.skip:focus{top:10px}.masthead,main,footer{width:min(1192px,calc(100% - 80px));margin:auto}.masthead{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:24px 0;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:13px;font:24px var(--display);letter-spacing:3px;text-decoration:none}.brand small{display:block;margin-top:7px;font:9px/1.4 sans-serif;letter-spacing:1.7px}.seal{display:grid;place-items:center;width:42px;height:48px;border:1px solid var(--accent);border-radius:3px;font-size:25px;letter-spacing:0}.masthead nav{display:flex;gap:24px;align-items:center;font-size:13px}.masthead nav a{text-decoration:none}.primary,.quiet{display:inline-flex;align-items:center;justify-content:center;gap:22px;border:1px solid var(--line);border-radius:6px;padding:10px 19px;background:transparent;text-decoration:none;white-space:nowrap}.primary{background:var(--ink);color:var(--surface);border-color:var(--ink)}.quiet:hover{background:var(--tint)}.text-button{background:none;border:0;padding:5px 0;text-align:left;font-size:13px}.text-button:hover{text-decoration:underline;text-underline-offset:5px}.intro{display:grid;grid-template-columns:1.18fr .82fr;gap:90px;align-items:center;padding:65px 0 62px}.kicker{font-size:12px;color:var(--muted);letter-spacing:2px;margin:0 0 20px}h1{font:500 clamp(35px,4vw,54px)/1.42 var(--display);letter-spacing:2px;margin:0 0 20px}.lead{font-size:15px;line-height:1.9;color:var(--muted);margin:0 0 28px}.hero-actions{display:flex;gap:28px;align-items:center;font-size:13px}.teacher{display:flex;align-items:center;gap:12px;margin-top:32px}.teacher img{width:42px;height:42px;border-radius:50%;object-fit:cover;object-position:38% 28%}.teacher p{font-size:13px;margin:0}.teacher small{display:block;color:var(--muted);font-size:11px}.featured{padding:28px 32px;background:var(--surface);border:1px solid var(--line);border-radius:8px;box-shadow:12px 12px 0 var(--tint);position:relative}.featured-top{display:flex;justify-content:space-between;font-size:11px;color:var(--muted);letter-spacing:2px}.featured-mark{display:block;font:80px/1.2 Georgia,serif;color:var(--accent);margin:23px 0 10px}.featured h2{font:27px/1.5 var(--display);margin:0 0 14px}.featured p{font:19px/1.8 var(--display);margin:0 0 21px;min-height:68px}.featured .text-button{border-top:1px solid var(--line);display:flex;justify-content:space-between;width:100%;padding-top:14px}.library{border-top:1px solid var(--line);padding:38px 0 46px}.library-heading{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-bottom:26px}.library-heading .kicker{margin-bottom:8px}.library-heading h2,.guide h2{font:28px/1.5 var(--display);margin:0}.total{font-size:12px;color:var(--muted)}.tools{display:flex;gap:12px;align-items:center;flex-wrap:wrap}.search-label{flex:1;min-width:200px}.tools input,.tools select{width:100%;min-height:46px;border:1px solid var(--line);border-radius:6px;background:var(--surface);padding:10px 14px;font-size:14px}.tools input::placeholder{color:var(--muted)}.tools select{min-width:155px}.tools .quiet{background:var(--surface);font-size:13px;gap:8px}.tools [aria-pressed=true]{background:var(--ink);color:var(--surface);border-color:var(--ink)}.results-bar{display:flex;align-items:center;gap:18px;min-height:62px;font-size:12px;color:var(--muted)}.results-bar #print{margin-left:auto}.gallery{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px}.tile{background:var(--surface);border:1px solid var(--line);border-radius:8px;overflow:hidden;position:relative;transition:transform .18s,border-color .18s}.tile:hover{transform:translateY(-3px);border-color:var(--accent)}.tile-open{display:flex;flex-direction:column;text-align:left;width:100%;padding:23px;border:0;background:none;min-height:305px}.tile-meta{font-size:11px;color:var(--muted);letter-spacing:1px;display:flex;justify-content:space-between;gap:10px;width:100%}.tile-mark{font:39px/1.3 Georgia,var(--display);color:var(--accent);margin:19px 0 12px}.tile-title{font:22px/1.5 var(--display);margin-bottom:10px}.tile-question{font-size:13px;line-height:1.8;color:var(--muted);margin-bottom:24px}.tile-bottom{font-size:11px;margin-top:auto;border-top:1px solid var(--line);padding-top:12px;width:100%;color:var(--accent)}.tile-saved{position:absolute;right:18px;bottom:15px;font-size:11px;color:var(--accent);pointer-events:none}.empty{padding:65px 25px;background:var(--surface);text-align:center;border:1px dashed var(--line);border-radius:8px}.empty h3{font:24px var(--display)}.empty p{color:var(--muted)}.guide{border-top:1px solid var(--line);padding:40px 0;display:grid;grid-template-columns:1.5fr 1fr;gap:60px}.guide p{max-width:60ch;color:var(--muted);font-size:14px;line-height:1.9}.contact{display:flex;align-items:flex-start;flex-direction:column;padding-left:38px;border-left:1px solid var(--line);gap:9px}.contact span{font-size:12px;color:var(--muted)}.contact strong{font:29px/1.3 Georgia,serif;letter-spacing:1px}.contact button{font-size:12px}footer{padding:25px 0 42px;border-top:1px solid var(--line);font-size:11px;color:var(--muted)}footer p{max-width:90ch}dialog{color:var(--ink);background:var(--bg);border:1px solid var(--line);border-radius:12px;width:min(600px,calc(100% - 24px));padding:22px;max-height:92dvh;overflow:auto}dialog::backdrop{background:#18364ba8;backdrop-filter:blur(3px)}.reader-toolbar{display:flex;align-items:center;justify-content:space-between;font-size:12px;color:var(--muted);margin-bottom:14px}.reader-toolbar button{font-size:12px}.reading-card{padding:30px;background:var(--surface);border:1px solid var(--line);border-radius:6px}.reading-card .card-top{display:flex;justify-content:space-between;font-size:11px;letter-spacing:2px;padding-bottom:16px;border-bottom:1px solid var(--line)}.reading-card .category{font-size:12px;color:var(--muted);margin:22px 0 0}.reading-card .mark{font:49px/1.3 Georgia,var(--display);color:var(--accent);margin:10px 0}.reading-card h2{font:28px/1.5 var(--display);margin:0 0 18px}.reading-card .idea{font-size:13px;color:var(--muted)}.question{background:var(--tint);border-left:2px solid var(--accent);padding:17px 20px;margin:23px 0}.question small,.action small{display:block;font-size:11px;color:var(--muted);margin-bottom:6px}.question p{font:21px/1.7 var(--display);margin:0}.action{font-size:14px;margin-bottom:25px}.reading-card .teacher{margin-top:14px}.reading-card .reply{font-size:12px;border-top:1px solid var(--line);padding-top:18px}.note{font-size:10px;color:var(--muted);margin-bottom:0}.reader-actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:18px}.reader-actions button{font-size:13px;flex:1;padding:10px}.reader-nav{display:flex;justify-content:space-between;margin-top:14px}#toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);max-width:calc(100% - 32px);background:var(--ink);color:var(--surface);padding:12px 22px;border-radius:6px;z-index:100;font-size:13px;box-shadow:0 5px 24px #0002}dialog #toast{position:sticky;transform:none;left:auto;margin-bottom:0;text-align:center}
[data-theme=dark]{color-scheme:dark;--bg:#142330;--surface:#1c3040;--ink:#edf7fe;--muted:#b8d0e0;--line:#446173;--tint:#284352;--accent:#8dcbed}
@media(max-width:1000px){.intro{gap:45px}.gallery{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media(max-width:700px){.masthead,main,footer{width:calc(100% - 36px)}.masthead{padding:18px 0}.brand{font-size:20px;gap:9px}.brand small{font-size:7px;letter-spacing:1px}.seal{width:32px;height:40px;font-size:22px}.masthead nav{gap:12px}.masthead nav>a{display:none}.masthead nav button{font-size:12px;padding:8px}.intro{grid-template-columns:1fr;gap:32px;padding:34px 0 40px}.intro h1{font-size:36px}.intro .kicker{font-size:11px}.teacher{margin-top:22px}.featured{padding:24px;box-shadow:0 8px 24px #1769990a}.featured-mark{font-size:57px;margin:17px 0 5px}.featured p{min-height:0}.featured h2{font-size:25px}.library{padding-top:28px}.library-heading{align-items:flex-start}.library-heading h2{font-size:25px}.total{font-size:10px;margin-top:28px;white-space:nowrap}.tools{gap:9px}.search-label{flex-basis:100%}.select-label{flex:1}.tools .quiet{padding:8px 11px}.tools select{min-width:0}.gallery{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.tile-open{padding:16px;min-height:282px}.tile-meta{font-size:10px;letter-spacing:0}.tile-mark{font-size:33px}.tile-title{font-size:20px}.tile-question{font-size:12px}.tile-saved{right:12px;font-size:10px}.guide{grid-template-columns:1fr;gap:20px}.guide h2{font-size:25px}.contact{padding-left:0;border-left:0}.reading-card{padding:22px}.reader-actions{gap:6px}.reader-actions button{font-size:12px}.desktop{display:none}}
@media(max-width:360px){.gallery{grid-template-columns:1fr}.total{display:none}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.tile{transition:none}}
@media print{@page{size:A5;margin:8mm}body{background:white;color:#18364b}.masthead,.intro,.tools,.results-bar,.library-heading,.guide,footer,#toast,dialog,.tile-saved{display:none!important}main{width:100%}.library{border:0;padding:0}.gallery{display:block}.tile{break-inside:avoid;border:0;border-radius:0;box-shadow:none;break-after:page}.tile-open{min-height:0}.print-detail{display:block!important;font-size:14px;line-height:1.9}.tile-question{font-size:20px}.tile-bottom{display:none}body:has(dialog[open]) main{display:none}body:has(dialog[open]) dialog{display:block!important;position:static;width:100%;max-height:none;padding:0;border:0;overflow:visible}dialog::backdrop{display:none}.reader-toolbar,.reader-actions,.reader-nav{display:none!important}.reading-card{border:0;padding:15px}.print-detail img{width:36px;height:36px;object-fit:cover;border-radius:50%}}
.print-detail{display:none}
@media print{:root,[data-theme=dark]{color-scheme:light;--bg:#fff;--surface:#fff;--ink:#18364b;--muted:#526b7b;--line:#d1e3ee;--tint:#e4f2fa;--accent:#176999}}

/* Official TDesign components share the site's sky-blue palette. */
:root{--td-brand-color:#176999;--td-brand-color-active:#10557e;--td-brand-color-light:#e4f2fa;--td-text-color-primary:#18364b;--td-bg-color-component:#e4f2fa;--td-bg-color-container:#fff;--td-component-border:#accbdc;--td-radius-default:6px;--td-font-family:'PingFang SC','Microsoft YaHei',sans-serif}
.td-mount{display:contents}.t-button{font-family:var(--td-font-family);min-height:44px}.t-button:focus-visible{outline:3px solid #176999;outline-offset:4px}

[data-theme=dark]{--td-brand-color:#8dcbed;--td-brand-color-active:#b9e5fc;--td-text-color-primary:#edf7fe;--td-text-color-anti:#142330;--td-bg-color-container:#1c3040;--td-component-border:#446173}
.tools .t-button{flex-shrink:0}.reader-actions .t-button{flex:1}.featured{border-top:3px solid var(--accent);box-shadow:0 8px 24px #1769990a}
@media(max-width:700px){.tools .t-button{padding-inline:12px}.featured{box-shadow:0 5px 18px #1769990a}}

.starter{padding:36px 0 44px;border-top:1px solid var(--line)}.starter h2{font:28px/1.5 var(--display);margin:0 0 10px}.starter-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.starter-card{display:flex;flex-direction:column;gap:14px;text-align:left;padding:24px;background:var(--surface);border:1px solid var(--line);border-radius:8px}.starter-card:hover{border-color:var(--accent)}.starter-card small,.starter-card span{font-size:12px;color:var(--muted)}.starter-card strong{font:23px/1.5 var(--display)}.reader-followup{border-top:1px solid var(--line);margin-top:20px;padding-top:16px;display:flex;flex-wrap:wrap;gap:10px}.reader-followup p{font-size:12px;color:var(--muted);margin:0}.reader-followup button{font-size:12px}.metrics{width:min(1192px,calc(100% - 80px));margin:0 auto 28px;color:var(--muted);font-size:12px}.metrics input{accent-color:var(--accent)}#campaign-status{font-size:12px;color:var(--accent)}@media(max-width:700px){.starter-grid{grid-template-columns:1fr}.starter-card{gap:8px;padding:20px}.metrics{width:calc(100% - 36px)}.starter h2{font-size:25px}}@media print{.starter,.metrics,.reader-followup,#campaign-status{display:none!important}}

.ai-panel{margin-top:22px;padding:22px;border:1px solid var(--line);background:var(--surface);border-radius:8px}.ai-heading{display:flex;justify-content:space-between;align-items:center;gap:10px}.ai-heading h2{font:22px/1.5 var(--display);margin:0}.ai-heading span,.ai-note{font-size:11px;color:var(--muted)}.ai-panel p{font-size:13px;line-height:1.8}.ai-panel textarea{display:block;resize:vertical;width:100%;padding:12px;border:1px solid var(--line);border-radius:6px;color:var(--ink);background:var(--bg);font:inherit;font-size:16px;line-height:1.6;margin:10px 0}.ai-consent{display:flex;gap:8px;align-items:flex-start;font-size:12px;margin:15px 0}.ai-consent input{margin-top:5px;accent-color:var(--accent)}#ai-result h3{font-size:15px;margin:18px 0 6px}#ai-result p{margin-top:0}#ai-status{color:var(--accent)}@media print{.ai-panel{display:none!important}}

/* Reading cards and AI stay on the same sky-blue palette. */
.seal{background:var(--accent);border-color:var(--accent);color:var(--bg);border-radius:8px}
.primary{background:var(--accent);border-color:var(--accent);color:var(--bg)}
.featured{border-radius:12px}.tile{border-radius:10px}
.tile-question,.featured p{font-size:14px}.reading-card .idea{font-size:14px}
.ai-note,.ai-heading span{font-size:12px}.ai-panel textarea{min-height:100px}
@media(max-width:700px){.tile-question{font-size:13px}.reading-card .idea{font-size:14px}}