:root{--paper:#f7f2e8;--paper-deep:#efe7d6;--ink:#2b2926;--ink-soft:#6b655c;--accent:var(--brand-sky);--accent-deep:var(--brand-sky-deep);--point:var(--brand-red);--cinnabar:var(--brand-sky);--cinnabar-deep:var(--brand-sky-deep);--line:#ddd2bd;--gold:#b8934a;--white:#fefcf7;--success:#3a7d44;--shadow-sm:0 2px 8px #2b292614;--shadow-md:0 8px 24px #2b29261f;--shadow-lg:0 18px 50px #2b292629;--radius:8px;--radius-lg:14px;--brand-sky:#003048;--brand-sky-deep:#002436;--brand-sky-tint:#e8eef1;--brand-eco:#84a890;--brand-earth:#9c6c48;--brand-red:#e41824;--brand-on-sky:#fcfcfc;--brand-on-sky-soft:#fcfcfca8;--brand-icon-radius:22.5%;--brand-glyph-inset:.12;--brand-mark-size:42px;--surface-brand:var(--brand-sky);--on-accent:#f7f2e8;--nav-bg:#f7f2e8eb;--note-bg:#fdf6e3;--note-border:#e8d9a8;--note-ink:#6b5a2a;--warn-bg:#ffe3a3;--warn-ink:#7a4a06;--surface-brand-deep:#063b52;--on-accent-soft:#f7f2e8b8;--line-strong:#cbbda1;--accent-ink:#33566a;--ok-bg:#f1f7f1;--ok-line:#cfe3d0;--danger-bg:#fdf2f0;--danger-line:#f3c9c3}:root[data-theme=dark]{color-scheme:dark;--paper:#12171a;--paper-deep:#0d1215;--ink:#e7e3d9;--ink-soft:#9ba4ab;--line:#2a343b;--white:#182027;--gold:#c9a765;--success:#6bbf7a;--accent:#2b6d8c;--accent-deep:#82bdd8;--point:#cf2b34;--cinnabar:#2b6d8c;--cinnabar-deep:#82bdd8;--surface-brand:#0e1a22;--on-accent:#f2f5f6;--nav-bg:#12171aeb;--brand-sky-tint:#1b2830;--brand-on-sky:#f2f5f6;--brand-on-sky-soft:#f2f5f69e;--note-bg:#241f14;--note-border:#453a22;--note-ink:#d9c68f;--warn-bg:#3b2f14;--warn-ink:#e9c87d;--surface-brand-deep:#0a141b;--on-accent-soft:#f2f5f6a8;--line-strong:#38454d;--accent-ink:#82bdd8;--ok-bg:#16281a;--ok-line:#2c4632;--danger-bg:#2a1719;--danger-line:#4a2529;--shadow-sm:0 2px 8px #00000073;--shadow-md:0 8px 24px #00000080;--shadow-lg:0 18px 50px #0009}*{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{background:var(--paper);color:var(--ink);font-family:Noto Serif SC,Songti SC,STSong,SimSun,serif;line-height:1.7}nav{z-index:10;background:var(--nav-bg);backdrop-filter:blur(8px);border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;padding:14px 6vw;display:flex;position:sticky;top:0}.brand{color:var(--ink);align-items:center;gap:12px;text-decoration:none;display:flex}.seal{background:var(--point);width:42px;height:42px;color:var(--on-accent);letter-spacing:2px;writing-mode:vertical-rl;border-radius:6px;place-items:center;font-size:15px;font-weight:700;display:grid;box-shadow:2px 2px #2b29262e}.brand-mark{width:var(--brand-mark-size);height:var(--brand-mark-size);padding:calc(var(--brand-mark-size) * var(--brand-glyph-inset));box-sizing:border-box;border-radius:var(--brand-icon-radius);background:var(--brand-sky);fill:var(--brand-on-sky);color:var(--brand-on-sky);flex:none;display:block;box-shadow:0 1px 3px #00304842}.brand b{letter-spacing:4px;font-size:20px}.brand small{color:var(--ink-soft);letter-spacing:1px;font-size:11px;display:block}.nav-links,.nav-primary{align-items:center;gap:28px;display:flex}.nav-tools{align-items:center;gap:12px;display:flex}.nav-links a{color:var(--ink-soft);font-size:15px;text-decoration:none;transition:color .2s}.nav-links a:hover{color:var(--cinnabar)}.nav-primary a.on{color:var(--ink);font-weight:700;position:relative}.nav-primary a.on:after{content:"";background:var(--cinnabar);border-radius:2px;height:2px;position:absolute;bottom:-6px;left:0;right:0}.theme-toggle{color:var(--ink-soft);border:1px solid var(--line);cursor:pointer;background:0 0;border-radius:999px;justify-content:center;align-items:center;min-width:34px;height:26px;padding:0 8px;font-family:inherit;font-size:13px;line-height:1;transition:color .2s,border-color .2s;display:inline-flex}.theme-toggle:hover{color:var(--accent);border-color:var(--accent)}.theme-toggle:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.nav-cta{background:var(--accent);border-radius:4px;padding:8px 18px;color:var(--on-accent)!important;font-size:14px!important}section{padding:64px 6vw}.sec-head{text-align:center;margin-bottom:44px}.sec-head h2{letter-spacing:6px;margin-bottom:10px;font-size:30px}.sec-head p{color:var(--ink-soft);margin-top:8px}.sec-head .rule{background:var(--cinnabar);border-radius:2px;width:56px;height:3px;margin:16px auto 0}.breadcrumb{color:var(--ink-soft);padding:18px 0 28px;font-size:14px}.breadcrumb a{color:var(--ink-soft);text-decoration:none}.breadcrumb a:hover{color:var(--cinnabar);text-decoration:underline}.breadcrumb span{color:var(--ink);font-weight:600}.btn-primary{background:var(--cinnabar);color:var(--on-accent);border-radius:var(--radius);padding:12px 28px;font-size:16px;font-weight:600;text-decoration:none;transition:background .2s,transform .15s;display:inline-block}.btn-primary:hover{background:var(--cinnabar-deep);transform:translateY(-1px)}.btn-secondary{color:var(--ink);border-radius:var(--radius);border:1.5px solid var(--line);background:0 0;padding:11px 26px;font-size:15px;text-decoration:none;transition:border-color .2s;display:inline-block}.btn-secondary:hover{border-color:var(--cinnabar)}.book-card{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow-sm);padding:16px;transition:transform .2s,box-shadow .2s}.book-card:hover{box-shadow:var(--shadow-md);transform:translateY(-3px)}.card-link{color:inherit;text-decoration:none;display:block}.card-header{justify-content:space-between;align-items:baseline;margin-bottom:6px;display:flex}.card-header h3{letter-spacing:1px;font-size:17px}.badge{background:var(--point);color:var(--on-accent);white-space:nowrap;border-radius:999px;padding:2px 8px;font-size:11px}.card-meta{color:var(--ink-soft);flex-wrap:wrap;gap:10px;margin-bottom:6px;font-size:13px;display:flex}.card-meta .bu{color:var(--gold);font-weight:600}.preview{color:var(--ink-soft);-webkit-line-clamp:2;border-top:1px solid var(--line);-webkit-box-orient:vertical;margin-top:8px;padding-top:8px;font-size:12.5px;line-height:1.5;display:-webkit-box;overflow:hidden}.filters{flex-wrap:wrap;justify-content:center;gap:10px;margin-bottom:30px;display:flex}.filters button{cursor:pointer;border:1px solid var(--line);background:var(--white);color:var(--ink-soft);border-radius:999px;padding:7px 20px;font-family:inherit;font-size:15px;transition:all .2s}.filters button:hover{border-color:var(--cinnabar);color:var(--cinnabar)}.filters button.active{background:var(--brand-sky-tint);color:var(--accent-deep);border-color:var(--accent)}.method-section{margin-bottom:40px}.method-section .section-title{letter-spacing:3px;justify-content:center;align-items:center;gap:16px;margin-bottom:24px;font-size:20px;display:flex}.section-title .rule{background:var(--line);flex:1;max-width:100px;height:1px}.method-grid{flex-wrap:wrap;justify-content:center;gap:10px;display:flex}.method-chip{background:var(--white);border:1px solid var(--line);border-radius:999px;align-items:center;gap:8px;padding:10px 16px;text-decoration:none;transition:all .2s;display:inline-flex}.method-chip:hover{border-color:var(--cinnabar)}.method-chip.active{border-color:var(--cinnabar);background:#fef5f4}.method-chip.locked{opacity:.6}.method-chip.unlocked{border-color:var(--success)}.chip-icon{font-size:18px}.chip-body strong{font-size:14px;display:block}.chip-body small{color:var(--ink-soft);font-size:11px;display:block}.chip-price{color:var(--gold);margin-left:4px;font-size:12px;font-weight:600}.guide-view{max-width:720px;margin:0 auto}.guide-header{margin-bottom:32px}.guide-meta-top{align-items:center;gap:12px;margin-bottom:12px;display:flex}.method-badge{background:var(--cinnabar);color:var(--on-accent);border-radius:999px;padding:4px 14px;font-size:14px;display:inline-block}.price-tag{color:var(--gold);font-size:14px;font-weight:600}.guide-header h1{letter-spacing:2px;margin-bottom:6px;font-size:28px}.guide-header .book-info{color:var(--ink-soft);font-size:15px}.guide-header .method-era{color:var(--gold);margin-top:4px;font-size:13px}.guide-content{line-height:1.85}.field{margin-bottom:24px}.field h4{color:var(--cinnabar);letter-spacing:1px;margin-bottom:8px;font-size:16px}.field p{color:var(--ink);font-size:15px}.field ul{padding-left:20px}.field li{color:var(--ink-soft);margin-bottom:4px;font-size:14px}.field dl{grid-template-columns:auto 1fr;gap:4px 12px;display:grid}.field dt{color:var(--ink-soft);font-size:14px;font-weight:600}.field dd{color:var(--ink);margin-bottom:4px;font-size:14px}.field-item em{color:var(--cinnabar);font-style:normal}.guide-footer{border-top:1px solid var(--line);color:var(--ink-soft);margin-top:40px;padding-top:20px;font-size:13px;line-height:1.8}.guide-footer a{color:var(--cinnabar)}.switch-section{max-width:720px;margin:40px auto 0}.switch-section h3{text-align:center;letter-spacing:2px;margin-bottom:16px;font-size:18px}.paywall-page{place-items:center;min-height:60vh;display:grid}.paywall-overlay{z-index:100;backdrop-filter:blur(6px);background:#2b2926b8;place-items:center;padding:20px;display:grid;position:fixed;inset:0}.paywall-card{background:var(--paper);border-radius:var(--radius-lg);text-align:center;width:100%;max-width:460px;box-shadow:var(--shadow-lg);padding:40px 34px;animation:.35s ease-out slideUp}@keyframes slideUp{0%{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}.paywall-badge{background:var(--cinnabar);color:var(--on-accent);letter-spacing:1px;border-radius:999px;margin-bottom:18px;padding:5px 16px;font-size:15px;display:inline-block}.paywall-card h2{letter-spacing:2px;margin-bottom:4px;font-size:22px}.paywall-era{color:var(--gold);margin-bottom:12px;font-size:13px}.paywall-desc{color:var(--ink-soft);margin-bottom:20px;font-size:14px;line-height:1.7}.free-preview{background:var(--white);border:1px dashed var(--line);border-radius:var(--radius);text-align:left;max-height:120px;margin-bottom:18px;padding:14px;overflow:hidden}.free-preview h4{color:var(--success);margin-bottom:6px;font-size:13px}.free-preview p{color:var(--ink-soft);font-size:13px;line-height:1.6}.paywall-actions{flex-direction:column;gap:10px;margin-bottom:16px;display:flex}.btn-purchase{background:var(--cinnabar);color:var(--on-accent);border-radius:var(--radius);padding:14px;font-size:16px;font-weight:700;text-decoration:none;transition:background .2s,transform .15s}.btn-purchase:hover{background:var(--cinnabar-deep);transform:translateY(-1px)}.btn-back{color:var(--ink-soft);font-size:14px;text-decoration:none}.btn-back:hover{color:var(--cinnabar)}.paywall-note{color:var(--ink-soft);font-size:12px}.paywall-note code{background:var(--white);border:1px solid var(--line);border-radius:3px;padding:2px 6px;font-size:12px}.token-input-group{gap:8px;margin-top:12px;display:flex}.token-input-group input{border:1px solid var(--line);border-radius:var(--radius);background:var(--white);flex:1;padding:10px 14px;font-family:inherit;font-size:14px}.token-input-group 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8px;font-size:11px}.mini-tag.free{color:var(--success);background:#e8f5e9}.mini-tag.paid{color:var(--gold);background:#fff3e0}.pricing-grid{grid-template-columns:repeat(3,1fr);gap:20px;max-width:900px;margin:0 auto 44px;display:grid}.pricing-card{background:var(--white);border:1px solid var(--line);border-radius:var(--radius-lg);text-align:center;padding:28px 22px;transition:transform .2s,box-shadow .2s}.pricing-card:hover{box-shadow:var(--shadow-md);transform:translateY(-4px)}.pricing-card.featured{border-color:var(--cinnabar);box-shadow:0 0 0 2px #9e2b251f}.pricing-card h3{letter-spacing:1px;margin-bottom:14px;font-size:18px}.pricing-amount{margin-bottom:4px;font-size:28px;font-weight:900}.pricing-unit{color:var(--ink-soft);margin-bottom:14px;font-size:13px}.pricing-features{text-align:left;margin-bottom:20px;list-style:none}.pricing-features li{color:var(--ink-soft);padding:4px 0;font-size:13px}.pricing-features li:before{content:"✓ ";color:var(--success)}.quota-grid{grid-template-columns:repeat(4,1fr);gap:16px;max-width:800px;margin:0 auto;display:grid}.quota-item{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);text-align:center;padding:18px}.quota-item strong{color:var(--cinnabar);font-size:22px;display:block}.center-link{text-align:center;margin-top:28px}.center-link a{color:var(--cinnabar);font-size:15px;text-decoration:none}.center-link a:hover{text-decoration:underline}.open-band{background:var(--ink);color:var(--paper);grid-template-columns:repeat(4,1fr);gap:26px;display:grid}.open-band h4{color:var(--gold);letter-spacing:2px;margin-bottom:8px;font-size:16px}.open-band p{color:#cfc8ba;font-size:13.5px;line-height:1.75}footer{text-align:center;background:var(--brand-sky);color:var(--brand-on-sky-soft);border-top:1px solid var(--line);padding:38px 6vw 34px;font-size:13px}footer b{color:var(--brand-on-sky);letter-spacing:3px;font-weight:700}footer a{color:#fcfcfce0;border-bottom:1px solid #fcfcfc47;text-decoration:none}footer a:hover{border-bottom-color:var(--brand-on-sky)}.footer-brand{justify-content:center;align-items:center;gap:12px;margin-bottom:14px;display:flex}.footer-mark{width:34px;height:44px;fill:var(--brand-on-sky);color:var(--brand-on-sky);flex:none}.footer-brand-name{text-align:left;line-height:1.35}.footer-brand-name b{font-size:17px}.footer-brand-name small{letter-spacing:2.4px;color:var(--brand-eco);text-transform:uppercase;margin-top:3px;font-family:Inter,Helvetica Neue,Arial,sans-serif;font-size:10px;display:block}@media (width<=900px){nav{flex-wrap:wrap;row-gap:8px;padding:10px 4vw}.brand{flex:auto;min-width:0}.nav-links{flex:100%;align-items:center;gap:10px;min-width:0}.nav-primary{scrollbar-width:none;-ms-overflow-style:none;-webkit-overflow-scrolling:touch;flex:1 1 0;gap:18px;min-width:0;overflow-x:auto}.nav-primary::-webkit-scrollbar{display:none}.nav-primary a{white-space:nowrap;font-size:14px!important}.nav-cta{display:none!important}.nav-tools{flex:none;gap:8px}.pricing-grid{grid-template-columns:1fr}.open-band,.quota-grid{grid-template-columns:repeat(2,1fr)}}@media (width<=600px){:root{--brand-mark-size:36px}.footer-mark{width:28px;height:36px}.hero h1{font-size:clamp(28px,7vw,42px)!important}.hero-stats{flex-direction:column;gap:14px}.book-grid{grid-template-columns:repeat(auto-fill,minmax(150px,1fr))}.nav-primary{gap:14px}.brand small{display:none}.brand b{letter-spacing:0;font-size:clamp(15px,4.8vw,20px)}.nav-primary a{letter-spacing:0;font-size:13px!important}.open-band,.quota-grid{grid-template-columns:1fr}}html.store-mode [data-store-hide],html:not(.store-mode) .store-only{display:none!important}