:root{--bg: #f4efe6;--surface: #efe8db;--surface-2: #e2d6c0;--text: #211c13;--ink-soft: #473e30;--muted: #857a66;--faint: #b8ad97;--line: #dccfb8;--line-strong: #cbbb9e;--border: var(--line);--accent: #b4522e;--accent-deep: #8f3d1f;--accent-tint: #f0d9cb;--ink-blue: #16212e;--ink-blue-2: #1f2d3d;--cool: #3f6f8f;--cool-soft: #8fb0c4;--gold: #c08a3e;--p0: #c0392b;--p1: #d97b25;--p2: #3678a3;--p3: #9c8f78;--serif: "Newsreader", Georgia, "Times New Roman", serif;--cjk: "Noto Serif SC", "Songti SC", "Source Han Serif SC", serif;--sans: "Noto Sans SC", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif}[data-theme=dark]{--bg: #14110b;--surface: #1d190f;--surface-2: #2a2418;--text: #e8e0d0;--ink-soft: #cdc4b0;--muted: #a09080;--faint: #6b6353;--line: #37322a;--line-strong: #4a4337;--border: var(--line);--accent: #d98a5c;--accent-deep: #c0703f;--accent-tint: #38271c;--gold: #cf9b4d;--p0: #d4564a;--p1: #e0913f;--p2: #4f93c0;--p3: #a99c84}body.cooled{background-color:#e7ded0;transition:background-color .5s ease}[data-theme=dark] body.cooled{background-color:#100d08}*,*:before,*:after{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font-family:var(--cjk);font-size:1rem;line-height:1.6;-webkit-font-smoothing:antialiased;background-image:radial-gradient(circle at 12% -8%,color-mix(in srgb,#fff 55%,var(--bg)) 0%,transparent 42%),radial-gradient(circle at 100% 0,color-mix(in srgb,#fff 30%,var(--bg)) 0%,transparent 40%);background-attachment:fixed;transition:background-color .5s ease,color .2s ease}[data-theme=dark] body{background-image:radial-gradient(circle at 12% -8%,color-mix(in srgb,#fff 7%,var(--bg)) 0%,transparent 45%),radial-gradient(circle at 100% 0,color-mix(in srgb,#fff 4%,var(--bg)) 0%,transparent 40%)}h1,h2,h3,h4,h5{font-family:var(--serif)}.site-title{font-family:var(--cjk)}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}h1{font-size:2rem;margin:0 0 .5rem;line-height:1.2}h2{font-size:1.5rem;margin:1.5rem 0 .5rem;line-height:1.3}h3{font-size:1.25rem;margin:1.25rem 0 .4rem}.container{width:100%;max-width:52rem;margin:0 auto;padding:0 1.25rem}.site-header{border-bottom:1px solid var(--border);background:var(--bg);transition:background .2s ease,border-color .2s ease}.site-header .container{display:flex;align-items:center;justify-content:space-between;padding-top:.875rem;padding-bottom:.875rem;gap:1rem}.site-title{font-size:1.1rem;font-weight:700;color:var(--text);text-decoration:none;white-space:nowrap}.site-title:hover{text-decoration:none;color:var(--accent)}.nav-links{display:flex;align-items:center;gap:1rem}.nav-links a{font-size:.9rem;color:var(--muted)}.nav-links a:hover{color:var(--accent)}.site-footer{border-top:1px solid var(--border);padding:1.5rem 0;margin-top:4rem}.site-footer p{margin:0;text-align:center;font-size:.85rem;color:var(--muted)}main{padding:2.5rem 0 3rem}.hero{padding:2rem 0 2.5rem;border-bottom:1px solid var(--border);margin-bottom:2rem}.hero-title{font-size:2.25rem;margin:0 0 .5rem;line-height:1.2}.hero-subtitle{color:var(--muted);font-size:1.05rem;margin:0 0 1.25rem;max-width:40rem}.section-heading{margin:0 0 1.25rem;font-size:1.2rem;color:var(--muted);text-transform:uppercase;letter-spacing:.06em;font-size:.8rem;font-weight:600}.cluster-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(20rem,1fr));gap:1rem;margin-top:1.25rem}.card{background:var(--surface);border:1px solid var(--border);border-radius:.5rem;padding:1.25rem;transition:transform .15s ease,box-shadow .15s ease,border-color .15s ease;text-decoration:none;color:var(--text);display:block}.card:hover{transform:translateY(-2px);box-shadow:0 4px 12px #0000001f;border-color:var(--accent);text-decoration:none}[data-theme=dark] .card:hover{box-shadow:0 4px 12px #0006}.cluster-card-num{font-size:.78rem;color:var(--muted);font-weight:600;letter-spacing:.05em;text-transform:uppercase;margin-bottom:.25rem}.cluster-card-zh{font-size:1.15rem;font-weight:700;margin-bottom:.2rem}.cluster-card-en{font-size:.875rem;color:var(--muted);margin-bottom:.75rem}.cluster-card-meta{display:flex;align-items:center;gap:.5rem;flex-wrap:wrap;margin-bottom:.75rem}.cluster-card-count{font-size:.8rem;color:var(--muted)}.story-list{display:flex;flex-direction:column;gap:.5rem;margin-top:1.25rem}.story-card{display:flex;align-items:center;gap:.75rem;background:var(--surface);border:1px solid var(--border);border-radius:.375rem;padding:.75rem 1rem;text-decoration:none;color:var(--text);transition:transform .12s ease,box-shadow .12s ease,border-color .12s ease}.story-card:hover{transform:translate(3px);border-color:var(--accent);box-shadow:0 2px 8px #00000014;text-decoration:none}[data-theme=dark] .story-card:hover{box-shadow:0 2px 8px #00000059}.story-num{font-size:.8rem;color:var(--muted);font-variant-numeric:tabular-nums;min-width:4rem;flex-shrink:0}.story-placeholder{font-size:.9rem;color:var(--muted);font-style:italic}.read-mark{margin-left:auto;color:var(--accent);font-size:.9rem}.priority-badge{display:inline-block;font-size:.7rem;font-weight:700;padding:.15em .5em;border-radius:.25rem;letter-spacing:.04em;vertical-align:middle}.priority-P0{background:#c0392b;color:#fff}.priority-P1{background:#e67e22;color:#fff}.priority-P2{background:#2980b9;color:#fff}.priority-P3{background:var(--border);color:var(--muted)}[data-theme=dark] .priority-P3{background:#3a362d;color:#a09080}.progress{display:flex;align-items:center;gap:.5rem;margin-top:.5rem}.progress-track{flex:1;height:6px;background:var(--border);border-radius:3px;overflow:hidden}.progress-fill{height:100%;background:var(--accent);border-radius:3px;transition:width .4s ease;width:0%}.progress-label{font-size:.75rem;color:var(--muted);white-space:nowrap;min-width:3rem;text-align:right}.cluster-page-header{padding-bottom:1.5rem;border-bottom:1px solid var(--border);margin-bottom:2rem}.cluster-page-title{font-size:1.75rem;margin:.25rem 0}.cluster-page-en{color:var(--muted);font-size:1rem;margin:0 0 .75rem}.back-link{font-size:.875rem;color:var(--muted);display:inline-flex;align-items:center;gap:.25rem;margin-bottom:1rem}.back-link:hover{color:var(--accent)}.theme-toggle{background:none;border:1px solid var(--border);border-radius:.375rem;padding:.3rem .55rem;cursor:pointer;color:var(--muted);font-size:1rem;line-height:1;transition:border-color .15s,color .15s}.theme-toggle:hover{border-color:var(--accent);color:var(--accent)}.theme-toggle .icon-sun{display:none}.theme-toggle .icon-moon,[data-theme=dark] .theme-toggle .icon-sun{display:inline}[data-theme=dark] .theme-toggle .icon-moon{display:none}.parable{font-family:Songti SC,"Noto Serif CJK SC","Noto Serif SC","Source Han Serif SC",SimSun,serif;font-size:1.125rem;line-height:2;max-width:34em;letter-spacing:.02em}.parable p{text-indent:2em;margin:0}.explanation{font-family:Charter,Bitstream Charter,Iowan Old Style,Cambria,Georgia,"Noto Serif",serif;font-size:1.0625rem;line-height:1.75;max-width:42em}.explanation p{margin:0 0 1.1em}.explanation strong.section-label{display:block;font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;font-size:.75rem;font-weight:650;text-transform:uppercase;letter-spacing:.1em;color:var(--accent);margin:1.8em 0 .4em}.explanation p:first-child>strong.section-label{margin-top:0}.explanation h2,.explanation h3{font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;font-size:.75rem;font-weight:650;text-transform:uppercase;letter-spacing:.1em;color:var(--accent);margin:2.2em 0 .6em}.explanation h2:first-child,.explanation h3:first-child{margin-top:0}.explanation strong{font-weight:650}.explanation em{font-style:italic}.explanation code{font-family:"Cambria Math","STIX Two Math","Latin Modern Math",ui-monospace,SF Mono,SFMono-Regular,Menlo,Consolas,monospace;font-size:.88em;background:var(--surface);border:1px solid var(--border);border-radius:.25rem;padding:.05em .34em;white-space:nowrap}.explanation code.formula{display:block;width:max-content;max-width:100%;margin:1.4em auto;padding:.85em 1.25em;font-size:1em;line-height:1.5;text-align:center;background:color-mix(in srgb,var(--accent) 5%,var(--surface));border:1px solid var(--border);border-radius:.5rem;white-space:pre-wrap;overflow-x:auto}.explanation .katex{font-size:1.08em}.explanation .katex-display{margin:1.4em 0;padding:.85em 1rem;background:color-mix(in srgb,var(--accent) 5%,var(--surface));border:1px solid var(--border);border-radius:.5rem;overflow-x:auto;overflow-y:hidden}.explanation .katex-display>.katex{font-size:1.15em}.explanation a{overflow-wrap:anywhere;text-decoration:underline;text-decoration-color:color-mix(in srgb,var(--accent) 35%,transparent);text-underline-offset:.15em}.explanation a:hover{text-decoration-color:var(--accent)}.explanation ul,.explanation ol{margin:0 0 1.1em;padding-left:1.4em}.explanation li{margin-bottom:.45em}.explanation li:last-child{margin-bottom:0}.explanation blockquote{margin:0 0 1.1em;padding:.25em 0 .25em 1em;border-left:3px solid var(--border);color:var(--muted)}.story-card.read{opacity:.7}.story-card.read .story-placeholder{display:none}.story-card.read .story-title{font-size:.875rem;color:var(--muted)}.story-breadcrumb{display:flex;align-items:center;gap:.5rem;font-size:.875rem;color:var(--muted);margin-bottom:1.5rem;flex-wrap:wrap}.story-breadcrumb a{color:var(--muted)}.story-breadcrumb a:hover{color:var(--accent)}.story-breadcrumb .sep{color:var(--border)}.story-article{padding-bottom:2rem;border-bottom:1px solid var(--border);margin-bottom:2rem}.reveal-zone{margin-top:2.5rem;padding-top:2rem;border-top:2px solid var(--border);display:flex;flex-direction:column;align-items:center;gap:1rem}.reveal-btn{background:var(--accent);color:#fff;border:none;border-radius:.5rem;padding:.75rem 2rem;font-size:1.05rem;font-weight:600;cursor:pointer;letter-spacing:.02em;transition:opacity .15s,transform .12s}.reveal-btn:hover{opacity:.88;transform:translateY(-1px)}.reveal-btn:active{transform:translateY(0)}.show-answer{font-size:.9rem;color:var(--muted)}#answer{align-self:stretch;width:100%;margin-top:.5rem}#answer:not([hidden]){animation:answer-in .6s cubic-bezier(.22,1,.36,1) both}@keyframes answer-in{0%{opacity:0;transform:translateY(14px)}to{opacity:1;transform:translateY(0)}}.answer-header{margin-bottom:1.75rem;padding-bottom:1.25rem;border-bottom:1px solid var(--border)}.answer-eyebrow{font-size:.72rem;font-weight:650;text-transform:uppercase;letter-spacing:.14em;color:var(--muted);margin:0 0 .5rem}.concept-title{font-family:Charter,Bitstream Charter,Iowan Old Style,Cambria,Georgia,"Noto Serif",serif;font-size:1.9rem;line-height:1.25;margin:0 0 .4rem;color:var(--accent);letter-spacing:-.01em}.answer-meta{font-size:.875rem;color:var(--muted);margin:0}.sources{margin-top:2rem;padding-top:1rem;border-top:1px solid var(--border);font-size:.85rem;color:var(--muted)}.sources h3{font-size:.85rem;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);margin:0 0 .5rem}.sources ul{margin:0;padding-left:1.25rem}.sources li{margin-bottom:.25rem}.sources a{color:var(--muted);word-break:break-all}.sources a:hover{color:var(--accent)}.story-nav{display:flex;justify-content:space-between;align-items:center;margin-top:2.5rem;padding-top:1.5rem;border-top:1px solid var(--border);gap:1rem}.story-nav-prev,.story-nav-next{font-size:.9rem;color:var(--muted);display:inline-flex;align-items:center;gap:.3rem}.story-nav-prev:hover,.story-nav-next:hover{color:var(--accent);text-decoration:none}.story-nav-spacer{flex:1}.spoiler-warning{display:flex;align-items:flex-start;gap:.75rem;background:color-mix(in srgb,var(--accent) 12%,var(--bg));border:1px solid color-mix(in srgb,var(--accent) 35%,var(--border));border-radius:.5rem;padding:1rem 1.25rem;font-size:.9rem;line-height:1.5;color:var(--text)}.spoiler-warning-icon{font-size:1.25rem;flex-shrink:0;line-height:1.4}.spoiler-warning strong{display:block;margin-bottom:.25rem}:root{--pagefind-ui-scale: 1;--pagefind-ui-primary: var(--accent);--pagefind-ui-text: var(--text);--pagefind-ui-background: var(--bg);--pagefind-ui-border: var(--border);--pagefind-ui-tag: var(--surface);--pagefind-ui-border-width: 1px;--pagefind-ui-border-radius: .375rem;--pagefind-ui-image-border-radius: .25rem;--pagefind-ui-image-box-ratio: 3 / 2;--pagefind-ui-font: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif}[data-theme=dark]{--pagefind-ui-background: var(--bg);--pagefind-ui-text: var(--text);--pagefind-ui-border: var(--border)}@media(max-width:640px){.cluster-grid{grid-template-columns:1fr}.hero-title{font-size:1.75rem}}.home-hero{padding:2.4rem 0 1.2rem}.home-eyebrow{font-family:var(--sans);font-size:.7rem;letter-spacing:.18em;text-transform:uppercase;color:var(--accent);margin:0 0 .6rem}.home-hero h1{font-size:clamp(2rem,5vw,2.9rem);margin:0 0 .3rem}.home-hero h1 .en{font-style:italic;font-weight:400;color:var(--muted);font-size:.5em}.home-hero .sub{font-family:var(--cjk);color:var(--ink-soft);font-size:1.05rem;margin:0;max-width:34rem}.map-card{background:var(--bg);border:1px solid var(--line-strong);border-radius:.7rem;box-shadow:0 1px color-mix(in srgb,#fff 60%,transparent) inset,0 10px 32px -20px #462d1480;overflow:hidden;margin:1.5rem 0 3rem}.map-top{display:flex;align-items:center;justify-content:space-between;padding:1.1rem 1.3rem .3rem;flex-wrap:wrap;gap:.6rem}.map-top h2{font-family:var(--cjk);font-weight:700;font-size:1.2rem;margin:0}.map-top .count{font-family:var(--serif);font-weight:600;font-variant-numeric:tabular-nums;font-size:1.05rem;color:var(--ink-soft)}.map-top .count b{color:var(--accent);font-size:1.5rem}.map-legend{display:flex;gap:1.1rem;flex-wrap:wrap;align-items:center;padding:0 1.3rem .6rem;font-family:var(--sans);font-size:.74rem;color:var(--muted)}.map-legend span{display:inline-flex;align-items:center;gap:.42rem}.map-legend .lg{width:14px;height:14px;border-radius:3.5px;border:1.6px solid var(--line-strong);background:transparent;display:inline-block;flex-shrink:0}.map-legend .lg.next{background:var(--gold);border-color:var(--gold);box-shadow:0 0 0 2px color-mix(in srgb,var(--gold) 35%,transparent)}.map-legend .lg.able{border-style:dashed;border-color:var(--accent);box-shadow:0 0 0 2px var(--accent-tint)}.map-legend .lg.read{background:var(--accent);border-color:var(--accent)}.map-legend .lg.rel{background:transparent;border-color:var(--cool);box-shadow:0 0 0 2px color-mix(in srgb,var(--cool) 40%,transparent)}.map-legend .legend-rel{display:none}.map-legend .legend-rel.show{display:inline-flex}.persona-bar{padding:.2rem 1.3rem .9rem}.persona-h{font-family:var(--sans);font-size:.7rem;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin:0 0 .55rem}.pbtns{display:flex;gap:.5rem;flex-wrap:wrap}.pbtn{display:flex;flex-direction:column;align-items:flex-start;gap:.05rem;background:var(--surface-2);border:1px solid var(--line-strong);border-radius:.55rem;padding:.45rem .8rem;cursor:pointer;transition:border-color .15s}.pbtn:hover{border-color:var(--accent)}.pbtn.active{border-color:var(--cool);background:color-mix(in srgb,var(--cool) 16%,var(--surface-2));box-shadow:0 0 0 1px var(--cool)}.pbtn.active .pl{color:var(--cool)}.pbtn .pl{font-family:var(--cjk);font-weight:600;font-size:.85rem;color:var(--ink-soft)}.pbtn .ps{font-family:var(--sans);font-size:.65rem;color:var(--muted)}.map-body{padding:.8rem 1.3rem 1.4rem}.km-pips .pip{transition:box-shadow .2s ease,transform .12s}.pip.rel{animation:relPulse 1.9s ease-out infinite;animation-fill-mode:backwards}.km-pips .pip.rel:nth-child(2n){animation-delay:.5s}.km-pips .pip.rel:nth-child(3n){animation-delay:.95s}@keyframes relPulse{0%{box-shadow:0 0 0 1.5px color-mix(in srgb,var(--cool) 72%,#fff),0 0 color-mix(in srgb,var(--cool) 40%,transparent)}70%{box-shadow:0 0 0 1.5px color-mix(in srgb,var(--cool) 72%,#fff),0 0 0 7px color-mix(in srgb,var(--cool) 0%,transparent)}to{box-shadow:0 0 0 1.5px color-mix(in srgb,var(--cool) 72%,#fff),0 0 color-mix(in srgb,var(--cool) 0%,transparent)}}@media(prefers-reduced-motion:reduce){.pip.rel{animation:none;box-shadow:0 0 0 1.5px color-mix(in srgb,var(--cool) 72%,#fff)}}.km-row{display:grid;grid-template-columns:9rem 1fr auto;align-items:center;gap:.85rem;padding:.46rem 0;border-top:1px dashed var(--line)}.km-row:first-child{border-top:none}.km-name{font-family:var(--cjk);font-size:.85rem;font-weight:500;display:flex;align-items:center;gap:.4rem;line-height:1.2}.km-pips{display:flex;gap:5px;flex-wrap:wrap}.pip{width:15px;height:15px;border-radius:3.5px;border:1.6px solid var(--line-strong);background:transparent;transition:transform .12s;cursor:pointer;padding:0;display:block}.pip:hover{transform:scale(1.22)}.pip.read{background:var(--accent);border-color:var(--accent)}.pip.next{background:var(--gold);border-color:var(--gold);box-shadow:0 0 0 2px color-mix(in srgb,var(--gold) 38%,transparent)}.km-ct{font-family:var(--sans);font-size:.74rem;color:var(--muted);font-variant-numeric:tabular-nums;white-space:nowrap;text-align:right}.km-ct b{color:var(--ink-soft)}.pri-dot{display:inline-block;width:7px;height:7px;border-radius:50%;vertical-align:middle;margin-right:.3rem;flex-shrink:0}@media(max-width:680px){.km-row{grid-template-columns:6.6rem 1fr auto;gap:.5rem}.km-name{font-size:.76rem}}.keepgoing{margin:2.4rem 0 1rem;border-top:1px solid var(--line);padding-top:1.3rem}.keepgoing-h{font-family:var(--sans);font-size:.7rem;letter-spacing:.13em;text-transform:uppercase;color:var(--muted);margin:0 0 .8rem}.mstrip{display:flex;gap:.7rem;flex-wrap:wrap}.mtile{background:var(--surface);border:1px solid var(--line);border-radius:.55rem;padding:.7rem 1rem;display:flex;align-items:center;gap:.8rem;text-decoration:none;color:inherit}.mtile .lab{font-family:var(--sans);font-size:.62rem;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin:0}.mtile.resume{cursor:pointer;transition:border-color .15s}.mtile.resume:hover{border-color:var(--accent);text-decoration:none}.mtile.resume .rtext{display:flex;flex-direction:column;gap:.15rem}.mtile.resume .rtext b{font-family:var(--cjk);font-weight:600;font-size:.9rem;color:var(--ink-soft)}.mtile.resume .go{font-family:var(--sans);font-size:.8rem;font-weight:600;color:var(--accent);white-space:nowrap}.mtile.streak .big{font-family:var(--serif);font-weight:600;font-size:1.2rem;font-variant-numeric:tabular-nums;color:var(--ink-soft)}.streak-dots{display:flex;gap:4px}.streak-dots i{width:10px;height:10px;border-radius:50%;background:var(--surface-2)}.streak-dots i.on{background:var(--accent)}.streak-dots i.today{background:var(--gold);box-shadow:0 0 0 2px color-mix(in srgb,var(--gold) 28%,transparent)}.story-wrap{max-width:42rem;margin:0 auto}.parable{font-family:var(--cjk);font-size:1.18rem;line-height:2.05;letter-spacing:.01em;color:var(--text);max-width:none}.parable p{text-indent:2em;margin:0 0 .2em}.guess{margin-top:2.2rem;border-top:1px solid var(--line);padding-top:1.6rem}.guess .q{font-family:var(--cjk);font-size:1rem;font-weight:600;margin:0 0 .9rem;display:flex;align-items:center;gap:.5rem;flex-wrap:wrap}.guess .q .badge{font-family:var(--sans);font-size:.62rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:#fff;background:var(--accent);border-radius:1rem;padding:.16rem .5rem}.gchips{display:flex;flex-direction:column;gap:.55rem}.gchip{display:flex;align-items:center;gap:.6rem;font-family:var(--cjk);font-size:.95rem;border:1.5px solid var(--line-strong);border-radius:.55rem;padding:.7rem .9rem;color:var(--ink-soft);background:var(--bg);text-align:left;transition:.14s;cursor:pointer;width:100%}.gchip:hover{border-color:var(--accent)}.gchip .key{font-family:var(--sans);font-size:.74rem;font-weight:700;color:var(--muted);border:1px solid var(--line-strong);border-radius:.3rem;width:1.5rem;height:1.5rem;display:flex;align-items:center;justify-content:center;flex-shrink:0}.gchip.sel{border-color:var(--accent);background:var(--accent-tint);color:var(--accent-deep);font-weight:600}.gchip.sel .key{background:var(--accent);color:#fff;border-color:var(--accent)}.gchip.skip{font-family:var(--sans);font-size:.85rem;color:var(--muted);border-style:dashed;justify-content:center}.reveal-row{margin-top:1.5rem;display:flex;align-items:center;gap:1rem;flex-wrap:wrap}.reveal-btn{background:var(--accent);color:#fff;border:none;border-radius:.55rem;padding:.85rem 2rem;font-family:var(--cjk);font-size:1.05rem;font-weight:600;transition:.15s;box-shadow:0 6px 18px -8px var(--accent);cursor:pointer}.reveal-btn:hover{transform:translateY(-2px);background:var(--accent-deep)}.reveal-hint{font-family:var(--sans);font-size:.8rem;color:var(--muted)}.concept{margin-top:2.2rem;background:linear-gradient(170deg,var(--ink-blue),#101a26);color:#e9e0cf;border-radius:.9rem;padding:1.8rem 1.7rem 1.5rem;box-shadow:0 24px 60px -28px #101a26b3}.concept[hidden]{display:none}.concept:not([hidden]){animation:concept-in .6s cubic-bezier(.22,1,.36,1) both}@keyframes concept-in{0%{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}.gfeedback{font-family:var(--sans);font-size:.82rem;border-radius:.5rem;padding:.6rem .85rem;margin:0 0 1.1rem;display:flex;align-items:center;gap:.5rem}.gfeedback.right{background:#6096602e;color:#bfe0bf;border:1px solid rgba(96,150,96,.35)}.gfeedback.wrong{background:#c08a3e29;color:#e3c391;border:1px solid rgba(192,138,62,.4)}.c-eyebrow{font-family:var(--sans);font-size:.66rem;letter-spacing:.16em;text-transform:uppercase;color:var(--cool-soft);margin:0 0 .4rem}.c-name{font-family:var(--serif);font-weight:600;font-size:2rem;color:#eaae84;margin:0 0 .15rem;line-height:1.1}.c-zh{font-family:var(--cjk);font-size:.95rem;color:var(--cool-soft);margin:0 0 1.1rem}.bridge{background:#ffffff0d;border:1px solid rgba(255,255,255,.1);border-left:3px solid var(--gold);border-radius:.45rem;padding:.85rem 1rem;font-family:var(--sans);font-size:.88rem;line-height:1.6;margin:0 0 1.2rem;color:#ddd3bf}.bridge b{color:var(--gold);font-weight:600}.layers-h{font-family:var(--sans);font-size:.66rem;letter-spacing:.16em;text-transform:uppercase;color:var(--cool-soft);margin:0 0 .2rem}.layers{border-top:1px solid rgba(255,255,255,.12)}.layer{border-bottom:1px solid rgba(255,255,255,.1)}.layer-h{display:flex;align-items:center;gap:.6rem;width:100%;background:none;border:none;color:#e9e0cf;padding:.85rem 0;font-family:var(--cjk);font-weight:600;font-size:1rem;text-align:left;cursor:pointer}.layer-h .pill{font-family:var(--sans);font-size:.6rem;letter-spacing:.08em;text-transform:uppercase;color:var(--cool-soft);border:1px solid rgba(143,176,196,.4);border-radius:1rem;padding:.12rem .5rem;font-weight:600;flex-shrink:0}.layer-h .chev{margin-left:auto;color:var(--cool-soft);transition:transform .2s;font-size:.8rem}.layer.open .layer-h .chev{transform:rotate(90deg)}.layer-b{font-family:var(--serif);font-size:.96rem;line-height:1.72;color:#c4bba6;display:none;padding:0 0 1rem}.layer.open .layer-b{display:block}.layer-b p{margin:0 0 .8em}.layer-b p:last-child{margin-bottom:0}.layer-b strong.section-label{color:#eaae84}.layer-b code{font-family:ui-monospace,Menlo,Consolas,monospace;font-size:.86em;background:#ffffff12;border:1px solid rgba(255,255,255,.14);border-radius:.3rem;padding:.05em .4em;color:#e6dcc6}.layer-b code.formula{display:block;width:max-content;max-width:100%;margin:1em auto;padding:.7em 1em;white-space:pre-wrap;text-align:center}.layer-b a{color:#9fc0d4}.math-inline{white-space:nowrap}.math-inline .katex{font-size:1.04em}.deepread-head{display:flex;align-items:center;gap:.7rem;margin:1.7rem 0 1rem;color:var(--cool-soft)}.deepread-head .line{flex:1;height:1px;background:#ffffff24}.deepread-head span{font-family:var(--sans);font-size:.66rem;letter-spacing:.16em;text-transform:uppercase;white-space:nowrap}.essay-en{font-family:var(--serif);font-size:1.04rem;line-height:1.78;color:#d8cfba;max-width:42em}.essay-en p{margin:0 0 1em;text-indent:0}.essay-en strong{font-weight:650;color:#e3d9c2}.essay-en strong.section-label{display:block;font-family:var(--sans);font-size:.7rem;font-weight:650;letter-spacing:.1em;text-transform:uppercase;color:#eaae84;margin:1.6em 0 .4em}.essay-en>p:first-child>strong.section-label,.essay-en>strong.section-label:first-child{margin-top:0}.essay-en h2,.essay-en h3{font-family:var(--sans);font-size:.7rem;font-weight:650;letter-spacing:.1em;text-transform:uppercase;color:#eaae84;margin:1.8em 0 .5em}.essay-en em{color:#cbbfa7;font-style:italic}.essay-en a{color:#9fc0d4;border-bottom:1px solid rgba(159,192,212,.35)}.essay-en ul,.essay-en ol{padding-left:1.3em}.essay-en code{font-family:ui-monospace,Menlo,Consolas,monospace;font-size:.86em;background:#ffffff12;border:1px solid rgba(255,255,255,.14);border-radius:.3rem;padding:.05em .4em;color:#e6dcc6}.essay-en code.formula{display:block;width:max-content;max-width:100%;margin:1.3em auto;padding:.8em 1.1em;white-space:pre-wrap;text-align:center;font-size:.95em}.essay-en .katex{color:#e6dcc6}.essay-en .katex-display{margin:1.3em 0;padding:.8em 1rem;background:#ffffff0d;border:1px solid rgba(255,255,255,.12);border-radius:.5rem;overflow-x:auto}.c-sources{margin-top:1.7rem;padding-top:1rem;border-top:1px solid rgba(255,255,255,.12)}.c-sources h3{font-family:var(--sans);font-size:.66rem;letter-spacing:.14em;text-transform:uppercase;color:var(--cool-soft);margin:0 0 .6rem}.c-sources ul{margin:0;padding:0;list-style:none}.c-sources li{margin-bottom:.45rem;font-family:var(--sans);font-size:.83rem;line-height:1.5;display:flex;gap:.4rem}.c-sources .src-num{color:var(--cool-soft);flex-shrink:0}.c-sources a{color:#9fc0d4;text-decoration:none;border-bottom:none;word-break:break-word;display:inline-flex;flex-direction:column;gap:.1rem}.c-sources .src-title{border-bottom:1px solid rgba(159,192,212,.35);line-height:1.45}.c-sources a:hover .src-title{color:#eaae84;border-bottom-color:#eaae84}.c-sources .src-url{font-size:.68rem;color:var(--cool-soft);opacity:.7;word-break:break-all}.ask{margin-top:1.7rem;border:1px solid rgba(192,138,62,.42);background:linear-gradient(180deg,#c08a3e1a,#c08a3e05);border-radius:.7rem;padding:1.1rem 1.2rem;position:relative;overflow:hidden}.ask-top{display:flex;align-items:center;gap:.55rem;margin-bottom:.5rem}.ask-top .ttl{font-family:var(--cjk);font-weight:700;font-size:1rem;color:#f0e6d2}.pro-badge{font-family:var(--sans);font-size:.6rem;font-weight:700;letter-spacing:.1em;color:#1a1205;background:linear-gradient(90deg,#e7b86a,var(--gold));border-radius:1rem;padding:.16rem .55rem}.ask-sub{font-family:var(--sans);font-size:.78rem;color:var(--cool-soft);margin:0 0 .85rem}.qa{display:flex;flex-direction:column;gap:.6rem;margin-bottom:.9rem}.bub{font-family:var(--sans);font-size:.84rem;line-height:1.55;border-radius:.7rem;padding:.6rem .85rem;max-width:88%;white-space:pre-wrap}.bub.u{align-self:flex-end;background:var(--cool);color:#eaf2f7;border-bottom-right-radius:.2rem}.bub.a{align-self:flex-start;background:#ffffff0f;border:1px solid rgba(255,255,255,.1);color:#d4cab4;border-bottom-left-radius:.2rem}.bub.a b,.bub.a strong{color:#eaae84;font-weight:600}.ask-input{display:flex;gap:.5rem;align-items:center;background:#ffffff12;border:1px solid rgba(255,255,255,.16);border-radius:.6rem;padding:.4rem .4rem .4rem .9rem}.ask-input input{flex:1;background:none;border:none;outline:none;color:#e9e0cf;font-family:var(--cjk);font-size:.88rem}.ask-input input::placeholder{color:var(--cool-soft)}.ask-input .send{background:var(--gold);color:#1a1205;border:none;border-radius:.45rem;padding:.45rem .9rem;font-family:var(--cjk);font-weight:600;font-size:.85rem;cursor:pointer}.ask-input .send:disabled{opacity:.55;cursor:default}.ask-quota{font-family:var(--sans);font-size:.7rem;color:var(--cool-soft);margin:.55rem 0 0}.chips{display:flex;gap:.45rem;flex-wrap:wrap;margin-top:.7rem}.chip{font-family:var(--sans);font-size:.76rem;color:var(--cool-soft);border:1px solid rgba(143,176,196,.35);border-radius:2rem;padding:.3rem .7rem;cursor:pointer;background:none}.chip:hover{border-color:#eaae84;color:#eaae84}.ask.locked .ask-input,.ask.locked .chips,.ask.locked .ask-quota{display:none}.ask.locked .qa{filter:blur(3.5px);opacity:.55;pointer-events:none;user-select:none}.ask:not(.locked) .lock-over{display:none}.lock-over{position:absolute;inset:30% 0 0;display:flex;flex-direction:column;align-items:center;justify-content:flex-end;text-align:center;gap:.55rem;padding:1.2rem;background:linear-gradient(180deg,transparent,rgba(20,18,10,.82) 44%)}.lock-over .cta{background:linear-gradient(90deg,#e7b86a,var(--gold));color:#1a1205;font-family:var(--cjk);font-weight:700;font-size:.95rem;border:none;border-radius:.5rem;padding:.6rem 1.6rem;cursor:pointer;display:inline-flex;align-items:center;gap:.4rem}.lock-over .cta:hover{filter:brightness(1.05)}.related{margin-top:1.5rem}.related .rh{font-family:var(--sans);font-size:.66rem;letter-spacing:.14em;text-transform:uppercase;color:var(--cool-soft);margin:0 0 .6rem}.rchips{display:flex;gap:.5rem;flex-wrap:wrap}.rchip{display:inline-flex;align-items:center;gap:.4rem;font-family:var(--cjk);font-size:.85rem;border:1px solid rgba(234,174,132,.5);border-radius:2rem;padding:.35rem .8rem;color:#eaae84;background:#ffffff0a;text-decoration:none;cursor:pointer}.rchip:hover{background:#eaae841f;text-decoration:none}.rchip .pri-dot{margin-right:0}.rchip.locked{border-style:dashed;border-color:#8fb0c473;color:var(--cool-soft)}.rchip.locked:before{content:"🔒";font-size:.72rem;opacity:.75}.rchip.locked:hover{background:#8fb0c41a}.rchip.seen:before{content:"✓";color:var(--cool-soft);font-size:.8rem}.story-foot{display:flex;justify-content:space-between;align-items:center;margin-top:2.4rem;gap:1rem;flex-wrap:wrap}.foot-btn{font-family:var(--cjk);font-size:.92rem;border:1px solid var(--line-strong);background:var(--bg);color:var(--ink-soft);border-radius:.5rem;padding:.6rem 1.1rem;display:inline-flex;align-items:center;gap:.4rem;text-decoration:none}.foot-btn:hover{border-color:var(--accent);color:var(--accent-deep);text-decoration:none}.foot-btn.primary{background:var(--accent);color:#fff;border-color:var(--accent)}.foot-btn.primary:hover{background:var(--accent-deep);color:#fff}#toast{position:fixed;left:50%;bottom:2rem;transform:translate(-50%) translateY(140%);background:var(--ink-blue);color:#eee4d2;font-family:var(--cjk);font-size:.88rem;padding:.7rem 1.2rem;border-radius:.6rem;box-shadow:0 14px 36px -14px #00000080;z-index:60;transition:transform .35s cubic-bezier(.2,1,.3,1),opacity .25s ease;max-width:88vw;opacity:0;pointer-events:none}#toast.show{transform:translate(-50%) translateY(0);opacity:1}.cdiagram{margin:1.5rem 0;padding:1.1rem 1.1rem .9rem;background:linear-gradient(170deg,#16212e,#101a26);border:1px solid rgba(255,255,255,.08);border-radius:.7rem}.cdiagram-head{display:flex;align-items:center;gap:.7rem;margin-bottom:.9rem;font-family:var(--sans),system-ui,sans-serif;font-size:.66rem;letter-spacing:.16em;text-transform:uppercase;color:#7c9aac}.cdiagram-head .cdiagram-line{flex:1;height:1px;background:#ffffff24}.cdiagram .mermaid{display:flex;justify-content:center;margin:.2rem 0 .6rem;overflow-x:auto;text-align:center;background:transparent;line-height:1.2}.cdiagram .mermaid svg{max-width:100%;height:auto}.cdiagram-cap{font-family:var(--sans),system-ui,sans-serif;font-size:.72rem;line-height:1.7;color:#8497a6;margin:.4rem 0 0;border-top:1px solid rgba(255,255,255,.07);padding-top:.6rem}.cdiagram-cap b{color:#c8b88f}.cdiagram-cap code{font-family:var(--mono, ui-monospace),monospace;font-size:.92em;color:#cbb98f}.cdiagram-cap .leg{color:#8fb0c4}