:root{--ink:#20304a;--muted:#718097;--accent:#db6645;--accent-dark:#b84b30;--yellow:#ffc94d;--mint:#52c6a4;--paper:#fffdf8;--line:#ece7dc;--shadow:0 14px 36px rgba(49,56,69,.09)}
[hidden]{display:none!important}
*{box-sizing:border-box}body{margin:0;color:var(--ink);background:radial-gradient(circle at 8% 20%,rgba(255,201,77,.16),transparent 22%),#fbfaf6;font-family:"Nunito","PingFang SC","Microsoft YaHei",system-ui,sans-serif}button{font:inherit;color:inherit}.skip-link{position:fixed;z-index:100;top:8px;left:8px;padding:9px;background:#fff;transform:translateY(-150%)}.skip-link:focus{transform:none}.learn-topbar{height:72px;display:flex;align-items:center;padding:0 max(24px,calc((100vw - 1120px)/2));border-bottom:1px solid var(--line);background:rgba(255,253,248,.95);backdrop-filter:blur(12px)}.back-link{padding:9px 12px;border-radius:12px;color:#657388;text-decoration:none;font-size: calc(14px * var(--fs, 1));font-weight:800}.back-link:hover{background:#f4f1ea}.learn-brand{display:flex;align-items:center;gap:10px;margin:auto;text-decoration:none}.learn-brand>span{display:grid;place-items:center;width:42px;height:42px;border-radius:14px;background:#ffe7b3;font-size: calc(22px * var(--fs, 1))}.learn-brand div{display:flex;flex-direction:column}.learn-brand b{font-size: calc(16px * var(--fs, 1))}.learn-brand small{margin-top:2px;color:var(--muted);font-size: calc(13px * var(--fs, 1))}.learner{display:flex;align-items:center;gap:7px;font-size: calc(14px * var(--fs, 1))}.learner span{display:grid;place-items:center;width:34px;height:34px;border-radius:12px;color:#27725f;background:#d8f2e8;font-weight:900}.learn-shell{width:min(1120px,calc(100% - 40px));margin:26px auto 90px}.mode-tabs{display:grid;grid-template-columns:1fr 1fr;gap:8px;width:min(500px,100%);margin:0 auto 22px;padding:6px;border:1px solid var(--line);border-radius:18px;background:#fff}.mode-tabs button{min-height:44px;border:0;border-radius:13px;color:var(--muted);background:transparent;cursor:pointer;font-size: calc(14.5px * var(--fs, 1));font-weight:900}.mode-tabs button.active{color:#fff;background:var(--accent);box-shadow:0 5px 0 var(--accent-dark)}.learn-hero{min-height:245px;display:flex;align-items:center;justify-content:space-between;overflow:hidden;padding:37px 45px;border:1px solid #eadbbf;border-radius:29px;background:linear-gradient(115deg,#fff4d9,#fffaf0 54%,#e4f6ef);box-shadow:var(--shadow)}.learn-hero>div:first-child{max-width:610px}.hero-kicker,.section-heading span,.lesson-tag,.quiz-kicker{color:var(--accent-dark);font-size: calc(13.5px * var(--fs, 1));font-weight:950;letter-spacing:.1em}.learn-hero h1{margin:11px 0 8px;font-size:clamp(29px,4vw,42px)}.learn-hero p{margin:0;color:#637185;line-height:1.7}.hero-art{width:150px;height:150px;display:grid;place-items:center;border:9px solid rgba(255,255,255,.72);border-radius:50%;background:#ffe39a;font-size: calc(75px * var(--fs, 1));box-shadow:0 10px 0 rgba(214,151,50,.17);transform:rotate(4deg)}.section-heading{display:flex;align-items:end;justify-content:space-between;margin:34px 5px 15px}.section-heading h2{margin:5px 0 0;font-size: calc(23px * var(--fs, 1))}.section-heading p{margin:0;color:var(--muted);font-size: calc(13.5px * var(--fs, 1))}.content-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:15px}.content-card{position:relative;overflow:hidden;min-height:285px;padding:0;border:1px solid var(--line);border-radius:23px;background:var(--paper);box-shadow:0 8px 25px rgba(49,56,69,.06);cursor:pointer;text-align:left;transition:.2s}.content-card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}.card-cover{height:130px;display:grid;place-items:center;background:var(--cover);font-size: calc(58px * var(--fs, 1))}.card-copy{display:flex;flex-direction:column;padding:18px}.card-copy>span{color:var(--accent-dark);font-size: calc(13.5px * var(--fs, 1));font-weight:900}.card-copy b{margin-top:6px;font-size: calc(18px * var(--fs, 1))}.card-copy p{min-height:39px;margin:7px 0;color:var(--muted);font-size: calc(13.5px * var(--fs, 1));line-height:1.6}.card-copy small{font-size: calc(13.5px * var(--fs, 1));font-weight:800}.done-tag{position:absolute;right:10px;top:10px;padding:5px 8px;border-radius:9px;color:#23775f;background:#dff6ed;font-size: calc(13px * var(--fs, 1));font-weight:900}.lesson-head,.quiz-head{display:flex;align-items:center;gap:15px;margin-bottom:16px}.lesson-head button,.quiz-head button{padding:10px 13px;border:1px solid var(--line);border-radius:12px;background:#fff;cursor:pointer;font-size: calc(13.5px * var(--fs, 1));font-weight:800}.lesson-head>div{display:flex;flex-direction:column;margin-left:auto;text-align:right}.lesson-head span{color:var(--muted);font-size: calc(13.5px * var(--fs, 1))}.lesson-head b{font-size: calc(13.5px * var(--fs, 1))}.lesson-card{display:grid;grid-template-columns:290px minmax(0,1fr);overflow:hidden;border:1px solid var(--line);border-radius:29px;background:#fff;box-shadow:var(--shadow)}.lesson-cover{min-height:100%;display:grid;align-items:start;justify-items:center;padding-top:100px;background:var(--cover);font-size: calc(105px * var(--fs, 1))}.lesson-copy{padding:38px 46px 44px}.lesson-copy h1{margin:8px 0;font-size: calc(34px * var(--fs, 1))}.lesson-meta{margin:0;color:var(--muted);font-size: calc(13.5px * var(--fs, 1))}.read-button{margin:18px 0 5px;padding:9px 13px;border:1px solid #d7dfeb;border-radius:12px;color:#376eaa;background:#edf6ff;cursor:pointer;font-size: calc(13.5px * var(--fs, 1));font-weight:900}.article-body{margin-top:18px;color:#34445b;font-size: calc(15px * var(--fs, 1));line-height:2.15}.article-body p{margin:0 0 14px}.article-body strong{color:var(--accent-dark);background:#fff1c9}.word-box,.think-box{margin-top:24px;padding:18px;border-radius:17px;background:#fff8df}.word-box h2{margin:0 0 11px;font-size: calc(15px * var(--fs, 1))}.word-box button,.word-box .tag-chip{display:inline-block;margin:0 7px 7px 0;padding:7px 11px;border:1px solid #e7c977;border-radius:99px;color:#785d19;background:#fff;font-size: calc(13.5px * var(--fs, 1))}.word-box button{cursor:pointer}.word-box button.saved{color:#fff;background:#d49336}.word-box .tag-chip{font-weight:800}.word-box>p{margin:3px 0 0;color:#927c4e;font-size: calc(13px * var(--fs, 1))}
body[data-page="reading"] .article-body p{text-align:center;font-size: calc(19px * var(--fs, 1));letter-spacing:.06em}.think-box{background:#eaf7f3}.think-box b{font-size: calc(14px * var(--fs, 1))}.think-box p{margin:6px 0 0;color:#4f766c;font-size: calc(13.5px * var(--fs, 1));line-height:1.6}.primary-button{width:100%;min-height:51px;margin-top:22px;border:0;border-radius:15px;color:#fff;background:var(--accent);box-shadow:0 6px 0 var(--accent-dark);cursor:pointer;font-weight:900}.quiz-head>div{height:10px;flex:1;overflow:hidden;border-radius:10px;background:#e6e8e9}.quiz-head i{display:block;width:0;height:100%;background:var(--mint);transition:width .2s}.quiz-head span{font-size: calc(13.5px * var(--fs, 1));font-weight:900}.quiz-card{position:relative;width:min(720px,100%);min-height:560px;margin:auto;padding:43px;border:1px solid var(--line);border-radius:29px;background:#fff;box-shadow:var(--shadow);text-align:center}.quiz-icon{width:90px;height:90px;display:grid;place-items:center;margin:17px auto;border-radius:29px;background:#fff1cc;font-size: calc(45px * var(--fs, 1))}.quiz-card h1{margin:0 auto 25px;max-width:600px;font-size: calc(25px * var(--fs, 1));line-height:1.5}.answer-list{display:grid;grid-template-columns:1fr 1fr;gap:10px}.answer-list button{min-height:59px;padding:12px;border:2px solid #e4e6e8;border-radius:15px;background:#fff;cursor:pointer;font-weight:800}.answer-list button:hover{border-color:var(--accent)}.answer-list button.correct{color:#25745e;border-color:#52c6a4;background:#e8f8f2}.answer-list button.wrong{color:#b34d45;border-color:#ef8a83;background:#fff0ee}.answer-feedback{display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:12px;margin-top:18px;padding:13px;border-radius:16px;background:#e9f7f1;text-align:left}.answer-feedback>span{width:38px;height:38px;display:grid;place-items:center;border-radius:12px;color:#fff;background:#4db893;font-weight:900}.answer-feedback h2{margin:0;font-size: calc(14px * var(--fs, 1))}.answer-feedback p{margin:3px 0 0;color:#617269;font-size: calc(13.5px * var(--fs, 1))}.answer-feedback button{min-height:39px;padding:0 16px;border:0;border-radius:12px;color:#fff;background:#3c9c7d;cursor:pointer;font-weight:900}.answer-feedback button:disabled{opacity:.48;cursor:not-allowed}.answer-feedback.wrong{background:#fff0ed}.answer-feedback.wrong>span{background:#e56a5f}.result-card{width:min(680px,100%);margin:20px auto;padding:42px;border:1px solid var(--line);border-radius:30px;background:#fff;box-shadow:var(--shadow);text-align:center}.result-stars{color:var(--yellow);font-size: calc(24px * var(--fs, 1));letter-spacing:8px}.result-fox{width:88px;height:88px;display:grid;place-items:center;margin:17px auto;border-radius:29px;background:#fff0cb;font-size: calc(51px * var(--fs, 1));transform:rotate(-3deg)}.result-card>span{color:var(--accent-dark);font-size: calc(13.5px * var(--fs, 1));font-weight:900;letter-spacing:.1em}.result-card h1{margin:8px 0;font-size: calc(28px * var(--fs, 1))}.result-card>p{margin:0;color:var(--muted);font-size: calc(14px * var(--fs, 1))}.result-stats{display:grid;grid-template-columns:repeat(3,1fr);margin:25px 0;border:1px solid var(--line);border-radius:17px}.result-stats div{display:flex;flex-direction:column;padding:17px;border-right:1px dashed var(--line)}.result-stats div:last-child{border:0}.result-stats strong{color:var(--accent-dark);font-size: calc(23px * var(--fs, 1))}.result-stats small{margin-top:3px;color:var(--muted);font-size: calc(13px * var(--fs, 1))}.result-actions{display:grid;grid-template-columns:1fr 1fr;gap:10px}.result-actions button{min-height:48px;border:2px solid var(--ink);border-radius:14px;cursor:pointer;font-weight:900}.result-actions button:first-child{background:#fff0c8}.result-actions button:last-child{color:#fff;background:var(--accent)}.learn-toast{position:fixed;z-index:110;left:50%;bottom:25px;padding:11px 17px;border-radius:12px;color:#fff;background:#263a55;opacity:0;transform:translate(-50%,15px);transition:.2s;pointer-events:none;font-size: calc(14px * var(--fs, 1));font-weight:800}.learn-toast.show{opacity:1;transform:translate(-50%,0)}body[data-mode="explore"]{--accent:#5b79cf;--accent-dark:#405aa3}body[data-mode="explore"] .learn-hero{background:linear-gradient(115deg,#eaf1ff,#f6f7ff 54%,#e4f7f2)}
button:focus-visible,a:focus-visible{outline:3px solid rgba(65,143,205,.4);outline-offset:3px}@media(max-width:760px){.learn-topbar{height:65px;padding:0 13px}.back-link span,.learn-brand small,.learner b{display:none}.learn-shell{width:calc(100% - 24px);margin-top:15px}.learn-hero{min-height:310px;align-items:flex-start;padding:27px 23px}.hero-art{position:absolute;width:120px;height:120px;right:35px;margin-top:130px;font-size: calc(60px * var(--fs, 1))}.content-grid{grid-template-columns:1fr}.content-card{min-height:160px;display:grid;grid-template-columns:125px 1fr}.card-cover{height:100%}.lesson-card{grid-template-columns:1fr}.lesson-cover{min-height:190px;padding-top:35px}.lesson-copy{padding:28px 20px}.answer-list{grid-template-columns:1fr}.quiz-card{padding:30px 17px}.answer-feedback{grid-template-columns:auto 1fr}.answer-feedback button{grid-column:1/-1;min-height:42px}.result-card{padding:35px 18px}.result-actions{grid-template-columns:1fr}}

/* 按诗歌主题生成的国风封面 */
.poem-scene{--sky-a:#edf4ee;--sky-b:#f9e8c8;--ridge-a:#8aa18e;--ridge-b:#405d56;--disc:#f1c56d;--scene-ink:#344f48;position:relative;display:block;width:100%;height:100%;min-height:130px;overflow:hidden;isolation:isolate;color:var(--scene-ink);background:linear-gradient(155deg,var(--sky-a),var(--sky-b))}
.poem-scene::after{content:"";position:absolute;z-index:8;inset:0;opacity:.2;pointer-events:none;background:repeating-linear-gradient(12deg,rgba(77,62,39,.08) 0 1px,transparent 1px 5px);mix-blend-mode:multiply}
.scene-disc{position:absolute;z-index:1;top:17%;right:16%;width:40px;height:40px;border-radius:50%;background:var(--disc);box-shadow:0 0 0 8px rgba(255,255,255,.15)}
.scene-cloud{position:absolute;z-index:2;width:56px;height:8px;border-radius:99px;background:rgba(255,255,255,.58);filter:drop-shadow(0 2px 1px rgba(58,65,65,.08));transition:transform .35s ease}
.scene-cloud::before,.scene-cloud::after{content:"";position:absolute;bottom:0;border-radius:50%;background:inherit}.scene-cloud::before{left:12px;width:20px;height:17px}.scene-cloud::after{right:9px;width:25px;height:12px}.cloud-one{top:24%;left:11%}.cloud-two{top:43%;right:9%;width:43px;opacity:.7;transform:scale(.78)}
.scene-ridge{position:absolute;left:-8%;right:-8%;bottom:-1px;transform-origin:bottom center;clip-path:polygon(0 66%,13% 38%,25% 57%,42% 17%,58% 55%,72% 30%,87% 56%,100% 37%,100% 100%,0 100%)}
.ridge-back{z-index:2;height:69%;opacity:.6;background:var(--ridge-a)}.ridge-front{z-index:3;height:55%;background:var(--ridge-b);clip-path:polygon(0 65%,18% 35%,31% 62%,50% 27%,65% 62%,81% 38%,100% 68%,100% 100%,0 100%)}
.scene-water{position:absolute;z-index:4;right:0;bottom:0;left:0;height:23%;opacity:.55;background:repeating-linear-gradient(0deg,rgba(245,249,242,.56) 0 2px,transparent 2px 8px)}
.scene-caption{position:absolute;z-index:6;left:14px;bottom:12px;padding:4px 7px;border:1px solid rgba(255,255,255,.42);border-radius:8px;color:#fff;background:rgba(34,54,53,.42);font-size: calc(12.5px * var(--fs, 1));font-weight:900;letter-spacing:.14em;backdrop-filter:blur(3px)}
.scene-focus{position:absolute;z-index:5;top:20%;left:17%;color:var(--scene-ink);font-family:"STKaiti","KaiTi","Kaiti SC",serif;font-size: calc(60px * var(--fs, 1));font-weight:500;line-height:1;opacity:.82;text-shadow:0 2px 0 rgba(255,255,255,.2);transform:rotate(-7deg)}
.scene-seal{position:absolute;z-index:7;right:11px;bottom:10px;width:23px;height:23px;display:grid;place-items:center;border:2px solid #a14335;border-radius:4px;color:#a14335;background:rgba(255,248,229,.76);font-family:"STKaiti","KaiTi",serif;font-size: calc(14px * var(--fs, 1));font-weight:900;transform:rotate(4deg)}
.theme-moon{--sky-a:#dce7ea;--sky-b:#aebfc8;--ridge-a:#708b92;--ridge-b:#304f58;--disc:#fff3bd;--scene-ink:#26424b}.theme-moon .scene-disc{box-shadow:0 0 22px rgba(255,245,190,.68)}
.theme-water{--sky-a:#dcefeb;--sky-b:#b9d6d5;--ridge-a:#7aa4a0;--ridge-b:#376d6a;--disc:#ffe3a1;--scene-ink:#235b5b}.theme-water .scene-water{height:31%;opacity:.78}
.theme-spring{--sky-a:#f4eadc;--sky-b:#dce9d2;--ridge-a:#a2b98a;--ridge-b:#587658;--disc:#f4bf85;--scene-ink:#9c5450}.theme-spring::before{content:"";position:absolute;z-index:5;top:-8px;right:-5px;width:73px;height:73px;border:4px dotted rgba(191,93,91,.55);border-radius:50%;transform:rotate(18deg)}
.theme-snow{--sky-a:#edf2f2;--sky-b:#d4dee1;--ridge-a:#b7c7c9;--ridge-b:#607b80;--disc:#fbf7e7;--scene-ink:#654443}.theme-snow::before{content:"";position:absolute;z-index:5;inset:0;background:radial-gradient(circle at 18% 18%,#fff 0 2px,transparent 3px),radial-gradient(circle at 75% 36%,#fff 0 1.5px,transparent 2.5px),radial-gradient(circle at 48% 12%,#fff 0 1px,transparent 2px);background-size:53px 47px,61px 59px,41px 43px}
.theme-village{--sky-a:#f5ead2;--sky-b:#d9e4c3;--ridge-a:#a8b77c;--ridge-b:#647543;--disc:#e9aa5b;--scene-ink:#6d5638}.theme-village .scene-water{background:repeating-linear-gradient(90deg,rgba(247,237,191,.55) 0 5px,transparent 5px 13px)}
.theme-creature{--sky-a:#f5e8d8;--sky-b:#cfe1dc;--ridge-a:#95b3a6;--ridge-b:#4c7166;--disc:#efb76a;--scene-ink:#614e3b}
.theme-study{--sky-a:#f1ead9;--sky-b:#d9e2d7;--ridge-a:#9caf9e;--ridge-b:#536b5d;--disc:#dba666;--scene-ink:#594f42}
.theme-frontier{--sky-a:#e9dac4;--sky-b:#c1d0cf;--ridge-a:#879b99;--ridge-b:#384e4d;--disc:#d88c5b;--scene-ink:#733f32}.theme-frontier .ridge-front{height:68%;clip-path:polygon(0 72%,17% 28%,29% 56%,46% 9%,60% 57%,80% 24%,100% 68%,100% 100%,0 100%)}
.variant-1 .scene-disc{right:25%;top:12%}.variant-1 .scene-focus{left:auto;right:16%;transform:rotate(5deg)}.variant-1 .ridge-back{transform:scaleX(-1)}.variant-2 .scene-disc{right:9%;top:29%;transform:scale(.78)}.variant-2 .scene-focus{top:13%;left:24%;transform:rotate(2deg)}
.content-card:hover .cloud-one{transform:translateX(7px)}.content-card:hover .cloud-two{transform:translateX(-6px) scale(.78)}
body[data-mode="reading"] .lesson-cover{display:block;padding:0;background:#e8eee8;font-size:0}
body[data-mode="reading"] .lesson-cover .poem-scene{min-height:100%}
body[data-mode="reading"] .lesson-cover .scene-disc{width:72px;height:72px}
body[data-mode="reading"] .lesson-cover .scene-focus{top:17%;left:21%;font-size: calc(112px * var(--fs, 1))}
body[data-mode="reading"] .lesson-cover .scene-caption{left:27px;bottom:27px;padding:7px 10px;font-size: calc(13.5px * var(--fs, 1))}
body[data-mode="reading"] .lesson-cover .scene-seal{right:25px;bottom:25px;width:34px;height:34px;font-size: calc(16px * var(--fs, 1))}

/* 拼音、诗意与双通道朗读 */
.poem-tools{display:flex;align-items:center;gap:9px;margin-top:18px}.poem-tools[hidden],.voice-disclosure[hidden],.explanation-box[hidden]{display:none}
.poem-preface{margin:16px 0 0;padding:11px 13px;border-left:3px solid #d8b76b;border-radius:0 12px 12px 0;color:#78694c;background:#fff8e7;font-family:"STKaiti","KaiTi","STSong","Songti SC",serif;font-size: calc(14.5px * var(--fs, 1));line-height:1.75}.poem-preface[hidden]{display:none}
.poem-tools .read-button{min-height:40px;margin:0;padding:9px 14px;border-color:#bed6ee;color:#265f99;background:linear-gradient(180deg,#f3f9ff,#e7f2ff);box-shadow:0 3px 0 #c8deef}
.pinyin-toggle{min-height:40px;padding:9px 14px;border:1px solid #ddd4bd;border-radius:12px;color:#70654f;background:#f7f4eb;cursor:pointer;font-size: calc(13.5px * var(--fs, 1));font-weight:900}.pinyin-toggle.active{color:#8c542b;border-color:#e8c38b;background:#fff3d9}
.voice-disclosure{display:flex;align-items:center;gap:6px;margin:11px 0 0;color:#65768b;font-size: calc(13.5px * var(--fs, 1))}.voice-disclosure>span:first-child{width:20px;height:20px;display:grid;place-items:center;border-radius:7px;background:#eef5ff}.voice-disclosure small{margin-left:auto;color:#8b96a4;font-size: calc(12.5px * var(--fs, 1))}
.poem-article{display:grid;gap:6px;margin-top:17px;padding:17px 15px;border:1px solid #eee1c7;border-radius:20px;background:linear-gradient(155deg,#fffdf7,#fff9e9);box-shadow:inset 0 0 26px rgba(189,145,71,.055)}
.poem-line{padding:7px 10px;border:1px solid transparent;border-radius:14px;text-align:center;transition:color .2s ease,background .2s ease,border-color .2s ease,transform .2s ease}
.poem-line .pinyin-line{display:block;min-height:19px;margin-bottom:2px;color:#a76544;font-family:"Nunito","PingFang SC",system-ui,sans-serif;font-size: calc(13.5px * var(--fs, 1));font-weight:800;line-height:1.55;letter-spacing:.035em;word-spacing:.08em}
body[data-page="reading"] .poem-line p{margin:0;padding:1px 8px;color:#2d3f51;font-family:"STKaiti","KaiTi","Kaiti SC","PingFang SC",serif;font-size: calc(21px * var(--fs, 1));font-weight:700;line-height:1.7;letter-spacing:.11em}
.poem-article.hide-pinyin .pinyin-line{display:none}.poem-article.hide-pinyin .poem-line{padding-top:4px;padding-bottom:4px}
.poem-line.is-reading{border-color:#efd18a;background:linear-gradient(90deg,#fff5d6,#fff0bf,#fff5d6);box-shadow:0 5px 14px rgba(172,117,43,.1);transform:scale(1.018)}
body[data-page="reading"] .poem-line.is-reading p{color:#9b4d26;font-weight:900}
.explanation-box{position:relative;margin-top:22px;padding:19px 20px 18px;border:1px solid #d9e4db;border-radius:19px;background:linear-gradient(145deg,#f1f8f4,#fbf8eb);overflow:hidden}.explanation-box::after{content:"诗";position:absolute;right:12px;bottom:-24px;color:rgba(66,109,92,.07);font-family:"STKaiti","KaiTi",serif;font-size: calc(92px * var(--fs, 1));transform:rotate(-8deg)}
.explanation-box h2{position:relative;z-index:1;display:flex;align-items:center;gap:9px;margin:0;color:#315f52;font-size: calc(17px * var(--fs, 1))}.explanation-box h2>span:first-child{width:30px;height:30px;display:grid;place-items:center;flex:0 0 auto;border-radius:10px;color:#fff;background:#4d8f79;font-family:"STKaiti","KaiTi",serif;font-size: calc(16px * var(--fs, 1));transform:rotate(-4deg)}.explanation-box h2 small{margin-left:auto;color:#789087;font-size: calc(13.5px * var(--fs, 1));font-weight:700}
.line-explanations{position:relative;z-index:1;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin-top:16px}.line-explanations article{padding:14px 15px;border:1px solid #dbe7df;border-radius:15px;background:rgba(255,255,255,.82);transition:border-color .2s,background .2s,transform .2s}.line-explanations article>div{display:flex;align-items:baseline;gap:9px}.line-explanations article span{flex:0 0 auto;padding:3px 6px;border-radius:7px;color:#437565;background:#e2f1eb;font-size: calc(13px * var(--fs, 1));font-weight:950}.line-explanations article strong{color:#2f4d43;font-family:"STKaiti","KaiTi","PingFang SC",serif;font-size: calc(16px * var(--fs, 1));line-height:1.5;letter-spacing:.04em}.line-explanations article p{margin:8px 0 0;color:#536c64;font-size: calc(14px * var(--fs, 1));line-height:1.75}.line-explanations article.is-reading{border-color:#dfb95d;background:#fff6d9;transform:translateY(-2px)}
.poem-summary{position:relative;z-index:1;margin-top:14px;padding:14px 15px;border-radius:15px;background:#deeee8}.poem-summary b{color:#315f52;font-size: calc(13.5px * var(--fs, 1))}.poem-summary p{margin:6px 0 0;color:#4d665e;font-size: calc(14px * var(--fs, 1));line-height:1.9}

/* Poem-specific local artwork and stronger attribution hierarchy. */
.poem-scene.poem-art{background:linear-gradient(145deg,#dfe9e2,#f4e4c7)}
.poem-art::before{content:"";position:absolute;z-index:2;inset:0;background:linear-gradient(180deg,transparent 45%,rgba(22,42,39,.28));pointer-events:none}
.poem-art .poem-background{position:absolute;z-index:1;inset:0;width:100%;height:100%;object-fit:cover;object-position:center;transition:transform .45s ease}
.content-card:hover .poem-background{transform:scale(1.035)}
.poem-art .scene-caption,.poem-art .scene-seal{z-index:4;color:#fff;border-color:rgba(255,255,255,.6);background:rgba(30,55,50,.56);text-shadow:0 1px 3px rgba(0,0,0,.24);backdrop-filter:blur(4px)}
.card-attribution{display:flex;align-items:center;gap:8px;min-height:30px!important;margin:8px 0 5px!important}
.card-attribution span{padding:5px 8px;border:1px solid #dccb9f;border-radius:8px;color:#765b28!important;background:#fff8e8;font-size: calc(13.5px * var(--fs, 1))!important;font-weight:950;letter-spacing:.06em}
.card-attribution strong{color:#263a46;font-family:"STKaiti","KaiTi","PingFang SC",serif;font-size: calc(18px * var(--fs, 1));line-height:1.2;letter-spacing:.07em}
.poem-attribution{display:flex;align-items:center;gap:11px;margin:10px 0 8px}
.poem-attribution[hidden]{display:none}
.poem-attribution span{padding:7px 11px;border:1px solid #dbc48e;border-radius:10px;color:#7d5721;background:#fff4d4;font-size: calc(14px * var(--fs, 1));font-weight:950;letter-spacing:.1em}
.poem-attribution strong{color:#263a46;font-family:"STKaiti","KaiTi","STSong","Songti SC",serif;font-size: calc(26px * var(--fs, 1));font-weight:800;line-height:1.2;letter-spacing:.14em}
body[data-mode="reading"] .lesson-card{display:block}
body[data-mode="reading"] .lesson-cover{height:clamp(260px,31vw,360px);min-height:260px;padding:0}
body[data-mode="reading"] .lesson-cover .poem-scene{min-height:100%}
body[data-mode="reading"] .lesson-cover .scene-caption{left:24px;bottom:21px;font-size: calc(13px * var(--fs, 1))}
body[data-mode="reading"] .lesson-cover .scene-seal{right:22px;bottom:20px}

@media(max-width:760px){
  body[data-page="reading"] .learn-hero{min-height:340px}
  .card-cover .scene-focus{font-size: calc(48px * var(--fs, 1))}.card-cover .scene-caption{left:8px;bottom:8px;padding:3px 5px;font-size: calc(12px * var(--fs, 1))}.card-cover .scene-seal{right:7px;bottom:7px;width:19px;height:19px;font-size: calc(13px * var(--fs, 1))}.card-cover .scene-disc{width:30px;height:30px}.card-cover .scene-cloud{transform:scale(.75)}
  body[data-mode="reading"] .lesson-cover{height:220px;min-height:220px;padding:0}body[data-mode="reading"] .lesson-cover .poem-scene{min-height:220px}body[data-mode="reading"] .lesson-cover .scene-focus{top:17%;left:22%;font-size: calc(86px * var(--fs, 1))}body[data-mode="reading"] .lesson-cover .scene-caption{left:18px;bottom:17px}body[data-mode="reading"] .lesson-cover .scene-seal{right:17px;bottom:16px}
  .poem-attribution{margin-top:8px}.poem-attribution span{font-size: calc(14px * var(--fs, 1))}.poem-attribution strong{font-size: calc(23px * var(--fs, 1))}.card-attribution span{font-size: calc(13.5px * var(--fs, 1))!important}.card-attribution strong{font-size: calc(17px * var(--fs, 1))}
  .poem-tools{align-items:stretch}.poem-tools .read-button,.pinyin-toggle{flex:1}.voice-disclosure{align-items:flex-start;flex-wrap:wrap}.voice-disclosure small{width:100%;margin-left:26px}.poem-article{padding:13px 8px}.poem-line{padding:6px 3px}.poem-line .pinyin-line{font-size: calc(13.5px * var(--fs, 1));line-height:1.45}body[data-page="reading"] .poem-line p{padding:1px 3px;font-size: calc(19px * var(--fs, 1));letter-spacing:.08em}.explanation-box{padding:17px}.explanation-box h2{flex-wrap:wrap}.explanation-box h2 small{width:100%;margin:2px 0 0 39px}.line-explanations{grid-template-columns:1fr}.line-explanations article{padding:13px}.line-explanations article strong{font-size: calc(15px * var(--fs, 1))}.line-explanations article p,.poem-summary p{font-size: calc(13.5px * var(--fs, 1))}
}
@media(prefers-reduced-motion:reduce){.scene-cloud,.poem-line{transition:none}.content-card:hover .cloud-one,.content-card:hover .cloud-two{transform:none}}

/* 六大主题知识探索目录 */
.poem-view-toolbar[hidden],.content-grid[hidden],.explore-toolbar[hidden],.explore-empty[hidden],.explore-source[hidden]{display:none!important}
.explore-toolbar{margin:0 0 18px;padding:20px;border:1px solid #dbe4f4;border-radius:24px;background:linear-gradient(145deg,#f7f9ff,#eef8f5);box-shadow:0 8px 24px rgba(65,90,150,.06)}
.explore-overview{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));overflow:hidden;margin-bottom:17px;border:1px solid #dfe6ef;border-radius:17px;background:rgba(255,255,255,.88)}
.explore-overview>span{display:flex;align-items:baseline;justify-content:center;gap:7px;padding:14px;border-right:1px dashed #d9e1eb;text-align:center}.explore-overview>span:last-child{border-right:0}.explore-overview strong{color:#405aa3;font-size: calc(24px * var(--fs, 1))}.explore-overview small{color:#6e7b8e;font-size: calc(13.5px * var(--fs, 1));font-weight:800}
.explore-topic-filters{display:flex;flex-wrap:wrap;gap:8px}
.explore-topic-filters button{min-height:38px;padding:7px 11px;border:1px solid #dce3ed;border-radius:12px;color:#56657a;background:#fff;cursor:pointer;font-size: calc(13.5px * var(--fs, 1));font-weight:900;transition:border-color .18s,background .18s,transform .18s}.explore-topic-filters button:hover{border-color:#8ba0da;transform:translateY(-1px)}.explore-topic-filters button.active{color:#fff;border-color:#526fbd;background:#5b79cf;box-shadow:0 4px 0 #405aa3}.explore-topic-filters button>span{display:inline-grid;place-items:center;width:21px;height:21px;margin-right:3px;border-radius:7px;background:rgba(255,255,255,.22);font-size: calc(14px * var(--fs, 1))}.explore-topic-filters button small{margin-left:3px;opacity:.78;font-size: calc(12.5px * var(--fs, 1))}
.explore-filter-row{display:grid;grid-template-columns:minmax(0,1fr) 180px;gap:10px;margin-top:15px}.explore-filter-row label{display:grid;grid-template-columns:auto minmax(0,1fr);align-items:center;gap:10px;min-height:46px;padding:5px 7px 5px 13px;border:1px solid #dce3ed;border-radius:14px;color:#66758a;background:#fff;font-size: calc(13.5px * var(--fs, 1));font-weight:900}.explore-filter-row input,.explore-filter-row select{min-width:0;height:34px;padding:0 10px;border:0;border-radius:9px;color:#263a55;background:#f4f6fa;font:inherit;font-size: calc(13.5px * var(--fs, 1));outline:none}.explore-filter-row input:focus,.explore-filter-row select:focus{box-shadow:0 0 0 3px rgba(91,121,207,.2)}
#exploreMatchCount{margin:12px 2px 0;color:#748195;font-size: calc(13.5px * var(--fs, 1));font-weight:800}
body[data-mode="explore"] .content-card{border-color:#e0e6f0;background:#fff}body[data-mode="explore"] .content-card:hover{border-color:#aebde2}body[data-mode="explore"] .card-cover{position:relative;text-shadow:0 4px 0 rgba(255,255,255,.45)}body[data-mode="explore"] .card-cover::after{content:"";position:absolute;inset:14px;border:1px dashed rgba(54,76,124,.18);border-radius:18px}body[data-mode="explore"] .card-copy>span{color:#526eb8}body[data-mode="explore"] .card-copy small{color:#405aa3}
.explore-cover-visual{position:relative;z-index:1;width:100%;height:100%;display:grid;place-items:center;overflow:hidden;color:#365174}.explore-cover-visual i{position:absolute;width:78px;height:78px;border:14px solid rgba(255,255,255,.48);border-radius:50%;transform:translate(28px,-8px)}.explore-cover-visual i::after{content:"";position:absolute;width:30px;height:30px;left:-35px;bottom:-18px;border:2px solid rgba(58,79,121,.15);border-radius:10px;transform:rotate(18deg)}.explore-cover-visual strong{position:relative;font-size: calc(50px * var(--fs, 1));line-height:1;font-weight:950;letter-spacing:-.08em}.explore-cover-visual small{position:absolute;right:13px;bottom:11px;padding:4px 7px;border-radius:7px;color:#49627e;background:rgba(255,255,255,.7);font-size: calc(12px * var(--fs, 1));font-weight:950;letter-spacing:.08em;text-shadow:none}.explore-cover-visual.is-large strong{font-size: calc(92px * var(--fs, 1))}.explore-cover-visual.is-large i{width:145px;height:145px;border-width:25px}.explore-cover-visual.is-large small{right:25px;bottom:25px;padding:7px 9px;font-size: calc(13px * var(--fs, 1))}
.card-badges .explore-grade-tag{color:#43577d;background:rgba(255,255,255,.92)}
.explore-empty{padding:54px 20px;border:1px dashed #bdc9dc;border-radius:22px;background:#f8faff;text-align:center}.explore-empty>span{display:block;font-size: calc(46px * var(--fs, 1))}.explore-empty b{display:block;margin-top:10px;font-size: calc(18px * var(--fs, 1))}.explore-empty p{margin:6px 0 17px;color:#748195;font-size: calc(13.5px * var(--fs, 1))}.explore-empty button{min-height:42px;padding:0 17px;border:0;border-radius:12px;color:#fff;background:#5b79cf;cursor:pointer;font-size: calc(13.5px * var(--fs, 1));font-weight:900;box-shadow:0 4px 0 #405aa3}
.explore-source{display:grid;grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:12px;margin-top:18px;padding:14px 15px;border:1px solid #dbe4f3;border-radius:16px;background:#f4f8ff}.explore-source>span{width:34px;height:34px;display:grid;place-items:center;border-radius:11px;color:#fff;background:#5b79cf;font-weight:900}.explore-source div{min-width:0}.explore-source b{font-size: calc(13.5px * var(--fs, 1))}.explore-source p{margin:3px 0 0;color:#728096;font-size: calc(13px * var(--fs, 1));line-height:1.5}.explore-source a{padding:8px 10px;border-radius:10px;color:#405aa3;background:#fff;text-decoration:none;font-size: calc(13.5px * var(--fs, 1));font-weight:900}.explore-source a:hover{text-decoration:underline}

@media(max-width:900px) and (min-width:761px){body[data-mode="explore"] .content-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:800px){body[data-mode="explore"] .hub-shell .learn-hero{min-height:330px;padding:28px 24px}}
@media(max-width:760px){
  body[data-mode="explore"] .learn-hero{min-height:330px}.explore-toolbar{padding:15px;border-radius:20px}.explore-overview strong{font-size: calc(20px * var(--fs, 1))}.explore-overview small{font-size: calc(13px * var(--fs, 1))}.explore-topic-filters{flex-wrap:nowrap;overflow-x:auto;padding:2px 2px 7px;scrollbar-width:thin}.explore-topic-filters button{flex:0 0 auto}.explore-filter-row{grid-template-columns:1fr}.explore-grade{grid-template-columns:auto 1fr!important}.explore-source{grid-template-columns:auto minmax(0,1fr)}.explore-source a{grid-column:1/-1;text-align:center}
}
@media(max-width:420px){.section-heading{align-items:flex-start;flex-direction:column;gap:8px}.section-heading p{text-align:left}.explore-overview>span{align-items:center;flex-direction:column;gap:2px;padding:11px 4px}.explore-overview small{line-height:1.35}.explore-filter-row label{grid-template-columns:1fr;gap:4px;padding:8px}.explore-filter-row input,.explore-filter-row select{width:100%}body[data-mode="explore"] .content-card{grid-template-columns:104px minmax(0,1fr)}body[data-mode="explore"] .card-copy{padding:15px 13px}body[data-mode="explore"] .card-copy b{font-size: calc(16px * var(--fs, 1))}}

/* Keep the local back action separate from leaving the learning area. */
.learn-topbar .learn-back { border:1px solid #ded8cb; background:#fff; cursor:pointer; touch-action:manipulation; min-height:48px; }
.learn-topbar .learn-back:disabled { opacity:1; color:#667389; border-color:transparent; background:transparent; cursor:default; }
.library-navigation { display:flex; justify-content:flex-end; margin:0 0 12px; }
.library-navigation a { display:inline-flex; align-items:center; min-height:44px; padding:8px 14px; color:#657388; text-decoration:none; border-radius:12px; }
.library-navigation a:hover { background:#f4f1ea; }
.learn-topbar .learn-back:focus-visible, .library-navigation a:focus-visible { outline:3px solid #b84b30; outline-offset:3px; }
@media(max-width:600px) {
  .learn-topbar.hub-topbar { gap:12px; padding-inline:12px; }
  .learn-topbar.hub-topbar .learn-brand { min-width:0; margin:auto; }
  .learn-topbar.hub-topbar .learn-brand > div:last-child { display:none; }
  .learn-topbar .learn-back { flex-shrink:0; padding-inline:10px; }
}