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article{border-top:1px solid #dce3e8;padding-top:16px}.benefit-grid article>span{font-size:10px;color:#a1aab0}.benefit-grid h3{font-size:15px;font-weight:550;margin-top:8px}.benefit-grid p{font-size:12px;line-height:1.9;color:var(--muted);margin-top:7px;max-width:320px}.section{padding-block:48px}.learning-records{margin-top:22px}.learning-empty{border:1px dashed #dbe2e7;border-radius:7px;background:#fbfcfd;padding:25px;display:flex;justify-content:space-between;gap:20px;align-items:center}.learning-empty>p{font-size:13px;color:var(--muted)}.learning-row{border:1px solid var(--line);border-radius:6px;padding:17px 20px;display:flex;justify-content:space-between;gap:20px;align-items:center;margin-top:10px}.learning-row h3{font-size:14px;font-weight:550}.learning-row p{font-size:11px;color:var(--muted);margin-top:4px}.learning-row>a{font-size:12px;white-space:nowrap}.join-section{padding-top:0}.join-panel{background:#f6f8f9;border:1px solid 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:root{--library-release:2}.group-card{display:flex;flex-direction:column;align-items:center;overflow:hidden}.qr-window{max-width:none;flex-shrink:0}.qr-expired{max-width:100%}
.group-card{display:flex;flex-direction:column;align-items:center;overflow:hidden}.qr-window{max-width:none;flex-shrink:0}.qr-expired{max-width:100%}
.qr-window img{image-rendering:pixelated}.consent{font-size:11px}.article-content{font-size:16px}@media(max-width:760px){.article-content{font-size:15px}}
.site-header{position:sticky;top:0;z-index:20;background:#fff}html{scroll-padding-top:110px}.book-sidebar{top:108px;max-height:calc(100dvh - 128px)}@media(max-width:760px){html{scroll-padding-top:95px}.book-sidebar{max-height:60dvh}}

/* Compact community account and standalone attribution. */
#login-dialog{width:min(400px,calc(100% - 36px));padding:30px}#login-dialog h2,#member-dialog h2{margin-top:0;font-size:24px}#login-dialog .modal-intro{margin-top:7px;font-size:12px}#login-dialog .consent{margin-top:18px}#login-status:empty,#member-status:empty{display:none}#submit-login{margin-top:22px}#login-status:not(:empty)+#submit-login{margin-top:0}#member-info{color:var(--muted);font-size:12px;margin-top:8px}.member-reading-records{margin-top:22px}.member-reading-row{display:flex;flex-direction:column;gap:5px;border-top:1px solid var(--line);padding:15px 0}.member-reading-row small{font-size:11px;color:var(--muted)}.member-reading-row>span{font-size:14px;line-height:1.7}.member-reading-row:hover>span{color:var(--red)}.member-empty{font-size:13px;color:var(--muted)}.member-empty .text-link{margin-top:14px}.credits-page{max-width:840px;padding-block:48px 70px}.credits-page h1{font-size:28px;font-weight:600;margin-top:25px;line-height:1.5}.credits-copy{font-size:14px;line-height:2;color:var(--muted);margin-top:25px}.credits-copy p+p{margin-top:18px}.credits-copy a{text-decoration:underline;text-underline-offset:3px;overflow-wrap:anywhere}@media(max-width:760px){#login-dialog{padding:28px 24px}.credits-page{padding-block:32px 48px}.credits-page h1{font-size:24px}.credits-copy{font-size:13px}}

.purchase-modal{width:min(400px,calc(100% - 36px));text-align:center;padding:30px}.purchase-modal h2{margin-top:0;font-size:23px}.purchase-account{font-size:11px;color:var(--muted);margin-top:8px}.purchase-price{font-size:36px;font-weight:650;letter-spacing:-1px;margin-top:17px;line-height:1.5}.purchase-scope{font-size:12px;color:var(--muted);margin-top:2px}.payment-qr{margin-top:20px}.payment-qr img{display:block;width:224px;height:224px;max-width:100%;margin:auto;border:1px solid var(--line);border-radius:6px;background:#fff}.payment-qr p{font-size:11px;color:var(--muted);margin-top:8px}.purchase-status{font-size:12px;line-height:1.8;color:var(--muted);margin-top:18px}.purchase-status:empty{display:none}.purchase-modal .button{margin-top:18px}.purchase-order{font-size:10px;overflow-wrap:anywhere;color:#95a0a7;margin-top:13px}.purchase-terms-link{font-size:10px;color:#8a969f;margin-top:15px}.purchase-modal.is-paid .purchase-status{color:#36764f}.purchase-modal.is-paid .purchase-price{display:none}.member-access{display:flex;flex-direction:column;align-items:flex-start;gap:8px;border-top:1px solid var(--line);margin-top:17px;padding-top:14px;font-size:12px;color:var(--muted)}.member-access .text-link{font-size:12px}@media(max-width:760px){.purchase-modal{padding:27px 23px}.purchase-modal h2{font-size:22px}.payment-qr img{width:210px;height:210px}}
.payment-qr img{height:auto;aspect-ratio:1}

/* Secondary gift redemption entry. */
.redeem-entry{display:inline-block;border:0;background:none;padding:4px 0;color:#7b8992;font-size:11px;text-decoration:underline;text-underline-offset:3px;margin-top:12px}.redeem-entry:hover{color:var(--ink)}.reading-gate .redeem-entry{display:block;margin-top:12px}#member-access-source{font-size:10px;color:#537467}#member-access-source:empty{display:none}#redeem-dialog h2{margin-top:0;font-size:24px}#redeem-continue{margin-top:22px}#redeem-code{font-family:Consolas,monospace;letter-spacing:1px}#redeem-status:empty{display:none}#redeem-submit{margin-top:20px}

/* Tutorial offer: one current price and a clearly labelled reference price. */
.library-offer{display:flex;align-items:center;justify-content:flex-end;gap:8px;flex-wrap:wrap}.library-offer strong{font-size:21px;color:var(--red);line-height:1.4}.offer-badge{display:inline-block;background:#fceef0;color:#bd3e50;border-radius:4px;padding:2px 7px;font-size:10px;white-space:nowrap}del{color:#98a1a8;text-decoration-thickness:1px}.library-offer del{font-size:11px}.purchase-promo{display:flex;justify-content:center;align-items:center;gap:10px;margin-top:19px;font-size:11px}.purchase-promo+.purchase-price{margin-top:4px}.purchase-modal.is-paid .purchase-promo{display:none}.reading-gate .gate-price{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.gate-price strong{font-size:26px;color:var(--red)}.gate-price del{font-size:11px}@media(max-width:760px){.library-offer{justify-content:flex-start;gap:7px}.library-offer strong{font-size:20px}}

/* Premium first screen and tangible course cards. */
.hero.wrap{position:relative;isolation:isolate;display:grid;grid-template-columns:minmax(0,1.35fr) minmax(260px,.8fr);align-items:center;gap:35px;margin-top:28px;margin-bottom:36px;padding:34px 42px;background:#101e2a;color:#fff;border:1px solid #223541;border-radius:20px;overflow:hidden;box-shadow:0 22px 45px -30px #10293870}
.hero::before{content:'';position:absolute;z-index:-1;inset:0;background:radial-gradient(ellipse at 88% 20%,#276b783b,transparent 55%),linear-gradient(120deg,#172d36 0%,#101e2a 60%);pointer-events:none}.hero::after{content:'';position:absolute;z-index:-1;right:-80px;bottom:-180px;width:500px;height:500px;border-radius:50%;border:1px solid #95ead41c;box-shadow:0 0 0 55px #95ead405,0 0 0 110px #95ead403;pointer-events:none}.hero .eyebrow{color:#b3c6cd;font-size:10px;letter-spacing:1px}.hero .red-dot{background:#98ebcc;box-shadow:0 0 12px #98ebcc66}.hero h1{font-size:43px;line-height:1.24;letter-spacing:-1.3px;font-weight:650;margin-top:13px}.hero .accent{color:#a7f3cf;white-space:normal}.hero-description{font-size:12px;line-height:1.95;color:#bdcbd3;margin-top:17px;max-width:650px}.hero-actions{display:flex;gap:17px;align-items:center;flex-wrap:wrap;margin-top:22px}.hero-actions>span{font-size:10px;color:#8da8b5}.hero-preview.button{background:#adf3d6;color:#12312c;border-color:#c7fae5;border-radius:8px;min-height:45px;padding:11px 18px;font-size:12px;gap:27px;font-weight:600;box-shadow:inset 0 1px #edfff7,0 7px 20px #0002}.hero-preview.button:hover{background:#c7ffe8;transform:translateY(-1px)}
.hero-workbench{position:relative;min-width:0;border:1px solid #8cd7cb33;border-radius:15px;padding:20px;background:linear-gradient(145deg,#2b4855d9,#172b39ed);box-shadow:inset 0 1px #ffffff20,0 24px 48px #0003;transform:perspective(900px) rotateY(-6deg) rotateX(2deg)}.workbench-heading{display:flex;align-items:center;gap:7px;font-size:10px;color:#b7cbd3}.workbench-dot{height:6px;width:6px;background:#a9efce;border-radius:50%;box-shadow:0 0 9px #a9efce55}.workbench-heading>i{margin-left:auto;color:#bbf7d9;font-size:20px;font-style:normal}.workbench-prompt{display:flex;align-items:center;gap:11px;padding:19px 14px;border-radius:10px;background:#ffffff0d;border:1px solid #ffffff18;margin-top:17px}.workbench-prompt>span{width:32px;height:32px;display:grid;place-items:center;background:#a8f2cf;color:#183e37;border-radius:9px;font-size:22px;flex-shrink:0;box-shadow:0 4px 15px #0002}.workbench-prompt strong{font-size:15px;font-weight:550;letter-spacing:.1px}.workbench-prompt p{font-size:9px;line-height:1.7;color:#a5bcc6;margin-top:4px}.workbench-outputs{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:9px;margin-top:12px}.workbench-outputs>div{background:linear-gradient(145deg,#fff,#e5eff2);border:1px solid #fff9;border-radius:9px;color:#304b58;padding:15px 7px;text-align:center;box-shadow:0 9px 16px #0002;font-size:10px}.output-icon{display:grid;place-items:center;width:31px;height:32px;margin:0 auto 9px;background:#e3eefb;color:#4b75a5;border:1px solid #bcd0e5;border-radius:5px;font-size:16px;font-weight:600;box-shadow:inset 2px 0 #fff9}.table-icon{background:#ddf2e8;color:#44876e;border-color:#b4ddcd;font-size:24px}.slide-icon{background:#f7ebe0;color:#b78355;border-color:#e4cdb8;font-size:26px}.workbench-footer{display:flex;align-items:center;gap:8px;font-size:9px;color:#9fb9c4;margin-top:19px}.tool-stack{display:flex;align-items:center}.tool-stack img{width:27px;height:27px;border-radius:7px;background:#fff;border:2px solid #d9e8ec;object-fit:contain;padding:2px;box-shadow:0 2px 6px #0002}.tool-stack img+img{margin-left:-5px}
.library-section{padding-top:0;padding-bottom:48px}.library-section .section-heading h2{font-size:24px;letter-spacing:-.7px}.book-grid{gap:24px;margin-top:23px}.book-card{--card-accent:#167c75;--card-shadow:#174a3b15;position:relative;isolation:isolate;overflow:hidden;border:1px solid #d9e9e4;border-radius:16px;padding:28px;background:linear-gradient(145deg,#fff 30%,#eff9f4);box-shadow:inset 0 1px #fff,0 4px 0 #e1ebe799,0 15px 30px -17px var(--card-shadow);transition:transform .2s,box-shadow .2s,border-color .2s}.book-card[data-book=doubao]{--card-accent:#545ace;--card-shadow:#3537a529;background:linear-gradient(145deg,#fff 30%,#f0f1ff);border-color:#e0e2f1;box-shadow:inset 0 1px #fff,0 4px 0 #e4e6f299,0 15px 30px -17px var(--card-shadow)}.book-card::before{content:'';position:absolute;z-index:-1;right:-40px;top:-70px;width:190px;height:190px;border-radius:50%;background:radial-gradient(circle,#95d6c337,transparent 70%);pointer-events:none}.book-card[data-book=doubao]::before{background:radial-gradient(circle,#a8b0f33d,transparent 70%)}.book-card:hover{transform:translateY(-4px);border-color:#b3cdc3;box-shadow:inset 0 1px #fff,0 4px 0 #dde9e5,0 20px 40px -16px #244f4440}.book-card[data-book=doubao]:hover{border-color:#b8bee2;box-shadow:inset 0 1px #fff,0 4px 0 #e0e3f1,0 20px 40px -16px #3e458b3b}.book-symbol.mint,.book-symbol.peach{width:72px;height:72px;display:grid;place-items:center;background:linear-gradient(145deg,#fff,#f5f9fa);border:1px solid #fff;border-radius:17px;box-shadow:inset 0 1px 2px #fff,0 7px 15px #1a415c14,0 2px 0 #dce7e5}.book-symbol img{display:block;width:54px;height:54px;object-fit:contain;border-radius:11px}.free-preview{font-size:10px;color:var(--card-accent);background:#ffffffb5;border:1px solid #dce6e7;border-radius:30px;padding:4px 10px;white-space:nowrap}.book-card h3{font-size:25px;margin-top:19px;letter-spacing:-.7px}.book-description{font-size:12px;line-height:1.9;color:#6b7e88;margin-top:11px}.book-tags{gap:7px;margin-top:16px}.book-tags span{background:#ffffffb0;border-color:#dce5e7;color:#71818b}.book-card-bottom{margin-top:24px;padding-top:21px;border-color:#dfe7e8}.book-card-bottom .button{background:var(--card-accent);border-color:transparent;border-radius:8px;font-size:12px;min-height:45px;padding:10px 17px;gap:23px;font-weight:550;box-shadow:inset 0 1px #ffffff24,0 5px 12px #344d5a18}.book-card-bottom .button:hover{filter:brightness(1.07);transform:translateY(-1px)}.book-card-bottom>span{color:#8b9ba3;font-size:9px}.join-panel{border-radius:15px}
@media(max-width:1100px){.hero.wrap{grid-template-columns:minmax(0,1.2fr) minmax(230px,.8fr);padding:31px;gap:25px}.hero h1{font-size:38px}.hero-description{font-size:11px}.hero-workbench{padding:16px}.workbench-prompt{padding:16px 10px}.workbench-prompt strong{font-size:13px}.workbench-prompt p{font-size:8px}.hero-actions{gap:10px}.book-card{padding:24px}.book-card h3{font-size:23px}}
@media(max-width:760px){.hero.wrap{display:block;margin-top:20px;margin-bottom:28px;border-radius:15px;padding:27px 24px}.hero h1{font-size:32px;line-height:1.3;letter-spacing:-.9px;margin-top:12px}.hero-description{font-size:11px;line-height:1.95;margin-top:15px}.hero-description br{display:none}.hero-actions{margin-top:20px;gap:10px}.hero-preview.button{width:100%;justify-content:space-between;font-size:12px;min-height:45px}.hero-actions>span{display:block;font-size:9px}.hero-workbench{display:none}.library-section{padding-bottom:32px}.library-section .section-heading h2{font-size:21px}.book-grid{gap:21px;margin-top:20px}.book-card{padding:24px;border-radius:14px}.book-symbol.mint,.book-symbol.peach{width:65px;height:65px;border-radius:15px}.book-symbol img{width:50px;height:50px}.book-card h3{font-size:24px;margin-top:18px}.book-description{font-size:12px}.book-card-bottom{flex-direction:column;align-items:stretch;gap:10px;margin-top:20px;padding-top:19px}.book-card-bottom .button{width:100%;justify-content:space-between;font-size:13px;min-height:47px}.book-card-bottom>span{text-align:center;font-size:10px}.free-preview{font-size:9px;padding:4px 8px}}
@media(max-width:360px){.hero.wrap{padding:25px 20px}.hero h1{font-size:28px}.hero-description{font-size:10px}.book-card{padding:21px}.book-card h3{font-size:22px}.free-preview{font-size:8px}.library-section .section-heading h2{font-size:20px}}
@media(prefers-reduced-motion:reduce){.hero-preview.button,.book-card,.book-card:hover,.book-card-bottom .button{transform:none!important;transition:none!important}.hero-workbench{transform:none}}
.hero-preview.button,.book-card-bottom .button{white-space:normal;line-height:1.5;text-align:left}.hero-preview.button>span,.book-card-bottom .button>span{flex-shrink:0}