:root{--purple:#6D28D9;--purple-soft:#A78BFA;--ink:#27242D;--muted:#716B78;--dark:#17151C;--bg:#F7F5FA;--soft:#ECE8F2;--accent:#F59E0B;--white:#fff;--line:#DCD5E5;--radius:18px;--shadow:0 14px 36px rgba(41,30,58,.08);--max:1180px;--narrow:820px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font-family:system-ui,-apple-system,"Segoe UI","Microsoft YaHei",sans-serif;line-height:1.72}img{display:block;max-width:100%;height:auto}a{color:inherit;text-decoration:none}a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid var(--accent);outline-offset:3px}.skip-link{position:fixed;left:1rem;top:-5rem;z-index:999;background:var(--white);padding:.7rem 1rem;border-radius:8px}.skip-link:focus{top:1rem}.site-header{position:sticky;top:0;z-index:100;background:rgba(247,245,250,.96);border-bottom:1px solid rgba(109,40,217,.12);backdrop-filter:blur(14px)}.header-inner{max-width:var(--max);margin:auto;min-height:76px;padding:0 24px;display:flex;align-items:center;gap:28px}.brand{display:flex;align-items:center;gap:10px;min-width:220px}.brand img{width:46px;height:46px;object-fit:contain;border-radius:12px}.brand strong{display:block;font-size:1.1rem}.brand small{display:block;color:var(--muted);font-size:.75rem}.main-nav{display:flex;gap:6px;margin-left:auto}.main-nav a{padding:10px 12px;border-radius:10px;color:#4e4854;font-size:.95rem}.main-nav a:hover,.main-nav a.is-active{background:var(--soft);color:var(--purple)}.search-open,.menu-toggle{border:0;border-radius:10px;padding:10px 14px;background:var(--dark);color:var(--white);font:inherit;cursor:pointer}.menu-toggle{display:none}.search-modal{position:fixed;inset:0;z-index:300;background:rgba(23,21,28,.72);padding:8vh 20px}.search-modal[hidden]{display:none!important}.search-dialog{position:relative;max-width:660px;margin:auto;background:var(--white);border-radius:22px;padding:34px;box-shadow:0 24px 70px rgba(0,0,0,.28)}.search-dialog h2{margin:.2rem 0 .5rem}.search-dialog p{color:var(--muted)}.search-close{position:absolute;right:18px;top:14px;width:38px;height:38px;border:0;border-radius:50%;font-size:1.6rem;background:var(--soft);cursor:pointer}.search-form label{font-weight:700;display:block;margin-bottom:7px}.search-field{display:flex;gap:8px}.search-field input{flex:1;min-width:0;border:1px solid var(--line);border-radius:12px;padding:12px 14px;font:inherit;background:#fff}.search-field button{border:0;border-radius:12px;background:var(--purple);color:#fff;padding:0 18px;font:inherit;font-weight:700;cursor:pointer}.section-wide{max-width:var(--max);margin:0 auto;padding:72px 24px}.section-narrow{max-width:var(--narrow);margin:0 auto;padding:66px 24px}.dark-zone{background:var(--dark);color:var(--white)}.soft-zone{background:var(--soft)}.section-kicker,.eyebrow{display:inline-block;color:var(--purple);font-weight:800;letter-spacing:.06em;font-size:.78rem;text-transform:uppercase}.dark-zone .section-kicker,.dark-zone .eyebrow{color:var(--purple-soft)}h1,h2,h3{line-height:1.24;letter-spacing:-.02em}h1{font-size:clamp(2.1rem,5vw,4.5rem);margin:.25em 0 .35em}h2{font-size:clamp(1.55rem,3vw,2.45rem);margin:.3em 0 .55em}h3{font-size:1.08rem;margin:.1em 0 .35em}p{margin:.7em 0;color:#3f3a45}.dark-zone p{color:#ccc5d2}.lead{font-size:1.12rem}.home-lead{max-width:none;padding:72px max(24px,calc((100vw - var(--max))/2));display:grid;grid-template-columns:minmax(0,1.2fr) minmax(320px,.8fr);gap:64px;align-items:center}.home-lead__copy{max-width:760px}.home-lead h1{font-size:clamp(2.7rem,5.8vw,5.7rem);max-width:900px}.lead-actions,.button-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}.button{display:inline-flex;align-items:center;justify-content:center;min-height:46px;padding:10px 18px;border-radius:12px;background:var(--white);border:1px solid var(--line);font-weight:800}.button.accent{background:var(--accent);border-color:var(--accent);color:#21180a}.button.ghost{background:transparent;color:inherit;border-color:rgba(255,255,255,.3)}.lead-visual img{aspect-ratio:4/3;object-fit:cover;border-radius:24px}.lead-visual figcaption,.visual-strip figcaption,.prose-grid figcaption{font-size:.84rem;color:#8f8697;margin-top:9px}.compact-intro{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:start}.compact-intro p{font-size:1.04rem}.split-index{display:grid;grid-template-columns:1.05fr .95fr;gap:24px}.index-primary,.index-secondary{padding:34px;border-radius:var(--radius)}.index-primary{background:var(--white);box-shadow:var(--shadow)}.index-secondary{background:var(--soft)}.index-secondary img{margin:20px 0;border-radius:14px;aspect-ratio:16/9;object-fit:cover}.fact-list{display:grid;gap:0;margin:24px 0;border-top:1px solid var(--line)}.fact-list div{display:grid;grid-template-columns:140px 1fr;gap:20px;padding:13px 0;border-bottom:1px solid var(--line)}.fact-list dt{color:var(--muted)}.fact-list dd{margin:0;font-weight:700}.fact-list.large{font-size:1.02rem}.text-link{color:var(--purple);text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:4px}.text-link.strong{font-weight:800}.stream-header,.topic-section>header,.related>header,.dense-index>header{display:grid;grid-template-columns:1.2fr .8fr;gap:30px;align-items:end;margin-bottom:22px}.stream-header>p,.topic-section>header>p,.related>header>p{color:var(--muted)}.article-list{border-top:1px solid var(--line)}.article-row{display:grid;grid-template-columns:120px 1fr;gap:28px;padding:26px 0;border-bottom:1px solid var(--line)}.article-row__meta{font-size:.84rem;color:var(--muted);padding-top:4px}.article-row h3 a:hover{color:var(--purple)}.article-row p{margin:.35em 0 .55em;color:var(--muted)}.section-end{text-align:right;margin-top:28px}.free-note{max-width:var(--max);margin:30px auto;padding:0;display:grid;grid-template-columns:.75fr 1.25fr;border-radius:24px;overflow:hidden}.free-note__visual img{width:100%;height:100%;min-height:320px;object-fit:cover}.free-note__body{padding:46px}.topic-map>header{max-width:760px}.topic-map__grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line);margin-top:28px}.topic-map__grid a{background:var(--bg);padding:28px;min-height:160px}.topic-map__grid a:hover{background:var(--white)}.topic-map__grid strong{display:block;font-size:1.06rem;margin-bottom:9px}.topic-map__grid span{color:var(--muted);font-size:.93rem}.late-topic{border-radius:24px;display:grid;grid-template-columns:1.2fr .8fr;gap:38px;align-items:center}.late-topic img{border-radius:18px;aspect-ratio:4/3;object-fit:cover}.closing-links{display:grid;gap:10px;margin-top:20px}.closing-links a{padding:14px 16px;border:1px solid var(--line);border-radius:12px;background:var(--white)}.closing-links a:hover{border-color:var(--purple);color:var(--purple)}.breadcrumbs{max-width:var(--max);margin:0 auto;padding:18px 24px 0}.breadcrumbs ol{list-style:none;padding:0;margin:0;display:flex;flex-wrap:wrap;gap:9px;color:var(--muted);font-size:.86rem}.breadcrumbs li+li:before{content:"/";margin-right:9px;color:#aaa}.breadcrumbs a:hover{color:var(--purple)}.page-hero{padding-top:54px;padding-bottom:38px}.page-hero h1{font-size:clamp(2.3rem,5vw,4.2rem)}.narrow-hero p{font-size:1.08rem}.prose-grid{display:grid;grid-template-columns:1.25fr .75fr;gap:54px;align-items:start}.prose-grid figure{position:sticky;top:110px;margin:0}.prose-grid figure img{border-radius:18px;width:100%;aspect-ratio:4/5;object-fit:cover}.brand-facts{padding-top:18px}.next-path{border-top:1px solid var(--line)}.video-head{max-width:var(--max);margin:28px auto 0;border-radius:24px;padding:54px;display:grid;grid-template-columns:1.2fr .8fr;gap:45px;align-items:center}.video-head img{border-radius:18px;aspect-ratio:4/3;object-fit:cover}.video-head h1{font-size:clamp(2.45rem,5vw,4.4rem)}.watch-principles p,.prose p{margin:1em 0}.dense-index>header img{width:180px;justify-self:end;border-radius:16px;aspect-ratio:16/10;object-fit:cover}.two-column-note{max-width:var(--max);margin:auto;border-radius:22px;padding:40px;display:grid;grid-template-columns:1fr 1fr;gap:46px}.visual-strip{display:grid;grid-template-columns:1fr 1fr;gap:22px}.visual-strip figure{margin:0}.visual-strip img{width:100%;aspect-ratio:16/8;object-fit:cover;border-radius:18px}.topic-section{padding-top:44px;padding-bottom:44px}.topic-section+ .topic-section{border-top:1px solid var(--line)}.article-page{padding-top:50px}.article-header{border-bottom:1px solid var(--line);padding-bottom:28px}.article-header h1{font-size:clamp(2.15rem,4.7vw,4rem)}.article-header time{color:var(--muted);font-size:.88rem}.article-body{font-size:1.05rem}.article-body h2{margin-top:2.1em}.article-body p{margin:1.1em 0}.article-body ul{padding-left:1.2em}.article-body li{margin:.5em 0}.related{padding-top:40px}.search-form.inline{margin-top:25px}.result-count{margin-bottom:20px}.empty-state{padding:44px;border:1px dashed var(--line);border-radius:18px;background:var(--white)}.faq-list{padding-top:24px}.faq-item{border-bottom:1px solid var(--line);padding:0}.faq-item summary{list-style:none;cursor:pointer;font-weight:800;padding:19px 0;font-size:1.03rem}.faq-item summary::-webkit-details-marker{display:none}.faq-item summary:after{content:"＋";float:right;color:var(--purple)}.faq-item[open] summary:after{content:"－"}.faq-item div{padding:0 0 16px}.prose code{background:var(--soft);padding:2px 6px;border-radius:6px}.not-found{text-align:center;padding-top:90px;padding-bottom:100px}.status-code{font-size:clamp(5rem,16vw,10rem);line-height:1;color:var(--purple-soft);font-weight:900}.site-footer{background:var(--dark);color:#f0ebf4;margin-top:60px}.footer-grid{max-width:var(--max);margin:auto;padding:58px 24px 40px;display:grid;grid-template-columns:1.4fr repeat(3,.8fr);gap:36px}.site-footer p{color:#aba3b0}.site-footer h2,.site-footer h3{margin-top:0}.site-footer a{display:block;color:#cfc8d6;padding:5px 0;font-size:.9rem}.site-footer a:hover{color:var(--white)}.footer-bottom{max-width:var(--max);margin:auto;border-top:1px solid #302c35;padding:18px 24px;display:flex;justify-content:space-between;color:#8f8794;font-size:.82rem}.back-top{position:fixed;right:20px;bottom:20px;border:0;border-radius:999px;padding:11px 15px;background:var(--purple);color:#fff;font-weight:700;box-shadow:var(--shadow);cursor:pointer}@media(max-width:1024px){.header-inner{gap:14px}.brand{min-width:0}.brand small{display:none}.main-nav a{padding:9px}.home-lead{grid-template-columns:1fr .7fr;gap:36px}.split-index,.prose-grid{gap:28px}.footer-grid{grid-template-columns:1.2fr repeat(3,1fr)}}@media(max-width:820px){.menu-toggle{display:block;margin-left:auto}.search-open{padding:9px 11px}.main-nav{display:none;position:absolute;top:76px;left:16px;right:16px;padding:12px;background:var(--white);border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow);flex-direction:column}.main-nav.is-open{display:flex}.main-nav a{padding:12px}.home-lead{grid-template-columns:1fr;padding-top:50px}.lead-visual{max-width:560px}.compact-intro,.split-index,.free-note,.late-topic,.video-head,.prose-grid,.two-column-note{grid-template-columns:1fr}.prose-grid figure{position:static}.prose-grid figure img{aspect-ratio:16/9}.topic-map__grid{grid-template-columns:1fr 1fr}.free-note__visual img{min-height:240px}.late-topic,.video-head{margin-left:18px;margin-right:18px;padding:34px}.stream-header,.topic-section>header,.related>header,.dense-index>header{grid-template-columns:1fr;gap:8px}.dense-index>header img{justify-self:start}.footer-grid{grid-template-columns:1fr 1fr}}@media(max-width:600px){.header-inner{padding:0 14px;min-height:68px}.brand img{width:40px;height:40px}.brand strong{font-size:1rem}.main-nav{top:68px}.search-open{font-size:0}.search-open:after{content:"搜索";font-size:.9rem}.section-wide,.section-narrow{padding-left:18px;padding-right:18px;padding-top:50px;padding-bottom:50px}.home-lead{padding:44px 18px}.home-lead h1{font-size:2.65rem}.lead-actions,.button-row{align-items:stretch}.button{width:100%}.article-row{grid-template-columns:1fr;gap:4px;padding:22px 0}.article-row__meta{order:2}.article-row>div:last-child{order:1}.topic-map__grid{grid-template-columns:1fr}.topic-map__grid a{min-height:0}.free-note{margin:20px 18px}.free-note__body{padding:28px}.late-topic,.video-head{padding:28px}.visual-strip{grid-template-columns:1fr}.fact-list div{grid-template-columns:1fr;gap:3px}.search-dialog{padding:26px 20px}.search-field{flex-direction:column}.search-field button{min-height:44px}.footer-grid{grid-template-columns:1fr;padding-top:44px}.footer-bottom{flex-direction:column;gap:4px}.two-column-note{margin:0 18px;padding:28px}.closing-links a{padding:13px}.page-hero h1,.article-header h1{font-size:2.5rem}}@media(max-width:390px){.brand span{display:none}.brand{margin-right:auto}.home-lead h1{font-size:2.25rem}.section-wide,.section-narrow{padding-left:15px;padding-right:15px}.late-topic,.video-head,.free-note,.two-column-note{margin-left:12px;margin-right:12px}.late-topic,.video-head{padding:22px}.footer-grid{padding-left:18px;padding-right:18px}}