:root{--bg: #ffffff;--soft: #fbfbfa;--ink: #101112;--body: #4a4a4a;--muted: #8c8c8c;--line: #e6e6e3;--line-soft: #f0f0ee;--accent: #101112;--accent-hover: #333333;--link: #b3341b;--radius: 6px;--max: 1080px;--measure: 720px;--sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Roboto, Helvetica, Arial, sans-serif;--serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, "Times New Roman", serif}[data-theme=dark]{--bg: #0d0d0e;--soft: #121213;--ink: #f2f2f0;--body: #a0a0a0;--muted: #757575;--line: #232324;--line-soft: #1a1a1b;--accent: #f2f2f0;--accent-hover: #ffffff;--link: #e0705a}*{box-sizing:border-box}html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:76px}body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--sans);font-size:17px;line-height:1.72;-webkit-font-smoothing:antialiased;overflow-wrap:break-word}img{max-width:100%;display:block}a{color:inherit;text-decoration:none}h1,h2,h3,h4{margin:0 0 .6em;line-height:1.22;letter-spacing:-.015em;font-weight:600;color:var(--ink)}h1{font-family:var(--serif);font-size:clamp(2.2rem,4.6vw,3.4rem);font-weight:500;letter-spacing:-.025em;line-height:1.1}h2{font-size:clamp(1.35rem,2.4vw,1.85rem)}h3{font-size:1.08rem}p{margin:0 0 1.15em;color:var(--body)}strong{font-weight:600;color:var(--ink)}.wrap{width:100%;max-width:var(--max);margin:0 auto;padding:0 28px}.wrap--measure{max-width:calc(var(--measure) + 56px)}.section{padding:88px 0}.section--soft{background:var(--soft)}.section--tight{padding:64px 0}.section-head{max-width:var(--measure);margin-bottom:36px}.section-head h2{margin-bottom:10px}.eyebrow{display:block;font-size:.75rem;letter-spacing:.16em;text-transform:uppercase;color:var(--muted);font-weight:600;margin-bottom:18px}.lead{font-size:1.12rem;color:var(--body);max-width:38em}.note{font-size:.87rem;color:var(--muted)}.breadcrumb{font-size:.82rem;color:var(--muted);margin-bottom:26px}.breadcrumb a:hover{color:var(--ink)}.site-header{position:sticky;top:0;z-index:60;background:color-mix(in srgb,var(--bg) 90%,transparent);backdrop-filter:saturate(160%) blur(12px);border-bottom:1px solid var(--line-soft)}.header-inner{display:flex;align-items:center;gap:22px;height:64px}.brand{display:inline-flex;align-items:center;gap:9px;font-weight:600;letter-spacing:-.01em;font-size:1rem;white-space:nowrap}.brand .zh{color:var(--muted);font-weight:400;font-size:.82rem}.brand-mark{width:26px;height:26px;border-radius:50%;border:1px solid var(--ink);color:var(--ink);display:grid;place-items:center;font-size:.62rem;font-weight:700}.nav{display:flex;gap:22px;margin-left:auto;align-items:center}.nav a{font-size:.9rem;color:var(--body);padding:4px 0;border-bottom:1px solid transparent}.nav a:hover,.nav a[aria-current=page]{color:var(--ink);border-bottom-color:var(--ink)}.header-actions{display:flex;align-items:center;gap:6px}.icon-btn{width:34px;height:34px;border-radius:50%;border:0;background:transparent;color:var(--muted);cursor:pointer;display:grid;place-items:center;font-size:.95rem;padding:0}.icon-btn:hover{color:var(--ink)}.nav-toggle{display:none}.btn{display:inline-flex;align-items:center;justify-content:center;height:42px;padding:0 22px;border-radius:4px;font-size:.9rem;font-weight:500;border:1px solid transparent;cursor:pointer;transition:background .15s ease,border-color .15s ease;white-space:nowrap}.btn--primary{background:var(--accent);color:var(--bg)}.btn--primary:hover{background:var(--accent-hover)}[data-theme=dark] .btn--primary{color:#101112}.btn--ghost{border-color:var(--line);color:var(--ink);background:transparent}.btn--ghost:hover{border-color:var(--ink)}.btn--sm{height:36px;padding:0 16px;font-size:.85rem}.btn--block{width:100%}.btn[disabled]{opacity:.5;cursor:not-allowed}.text-link{font-size:.9rem;color:var(--link);border-bottom:1px solid color-mix(in srgb,var(--link) 35%,transparent)}.text-link:hover{border-bottom-color:var(--link)}button.text-link{background:none;border:0;border-bottom:1px solid color-mix(in srgb,var(--link) 35%,transparent);padding:0;font-family:inherit;cursor:pointer}button.text-link:hover{border-bottom-color:var(--link)}.hero{padding:96px 0 72px;border-bottom:1px solid var(--line-soft)}.hero h1{max-width:20ch;margin-bottom:22px}.hero-actions{display:flex;align-items:center;gap:20px;flex-wrap:wrap;margin-top:30px}.hero-facts{display:flex;gap:40px;flex-wrap:wrap;margin-top:48px;padding-top:26px;border-top:1px solid var(--line-soft)}.hero-facts div strong{display:block;font-family:var(--serif);font-size:1.5rem;font-weight:500;line-height:1.2}.hero-facts div span{font-size:.82rem;color:var(--muted)}.hero-list{margin:48px 0 0;padding:26px 0 0;border-top:1px solid var(--line-soft);display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px 40px;list-style:none;font-size:.92rem;color:var(--body)}.hero-list li:before{content:"—";color:var(--muted);margin-right:10px}@media(max-width:720px){.hero-list{grid-template-columns:1fr}}.grid{display:grid;gap:30px}.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}.block{border-top:1px solid var(--line-soft);padding-top:18px}.block h3{margin-bottom:6px}.block p{font-size:.95rem}.card{border:1px solid var(--line);border-radius:var(--radius);padding:24px}.card h3{margin-bottom:8px}.card p{font-size:.95rem}ul.plain{list-style:none;margin:16px 0 0;padding:0;font-size:.93rem;color:var(--body)}ul.plain li{padding:7px 0;border-bottom:1px solid var(--line-soft)}ul.plain li:last-child{border-bottom:0}ul.bullet{margin:14px 0 0;padding-left:18px;font-size:.93rem;color:var(--body)}ul.bullet li{margin-bottom:6px}.city-item{padding:30px 0;border-top:1px solid var(--line-soft)}.city-item h3{margin-bottom:6px}.city-item .meta{font-size:.88rem;color:var(--muted);margin-bottom:10px}.city-item .city-actions{display:flex;gap:20px;align-items:center;flex-wrap:wrap;margin-top:14px}.event{padding:26px 0;border-top:1px solid var(--line-soft)}.event-body h3{font-size:1.05rem;margin-bottom:4px}.event-meta{font-size:.85rem;color:var(--muted);margin-bottom:8px}.event p{font-size:.94rem;margin:0 0 10px}.filters{display:flex;gap:22px;flex-wrap:wrap;margin-bottom:28px;padding-bottom:12px;border-bottom:1px solid var(--line-soft)}.filter-btn{border:0;background:transparent;color:var(--muted);padding:0 0 2px;font:inherit;font-size:.88rem;cursor:pointer;border-bottom:1px solid transparent}.filter-btn:hover{color:var(--ink)}.filter-btn[aria-pressed=true]{color:var(--ink);border-bottom-color:var(--ink)}.faq-groups{max-width:var(--measure)}.faq-groups .faq-group:last-child{margin-bottom:0}.faq-group{margin-bottom:40px}.faq-group h3{font-size:.72rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);font-weight:600;margin-bottom:4px}details.faq{border-bottom:1px solid var(--line-soft)}details.faq summary{cursor:pointer;padding:15px 30px 15px 0;position:relative;font-size:1rem;color:var(--ink);list-style:none}details.faq summary::-webkit-details-marker{display:none}details.faq summary:after{content:"+";position:absolute;right:2px;top:50%;transform:translateY(-50%);color:var(--muted);font-size:1.05rem}details.faq[open] summary:after{content:"–"}details.faq .answer{padding:0 30px 18px 0;font-size:.96rem;color:var(--body)}.form{display:grid;gap:20px;max-width:520px}.field{display:grid;gap:6px}.field label{font-size:.83rem;color:var(--muted)}.field .hint{font-size:.8rem;color:var(--muted)}input,select,textarea{font:inherit;font-size:.95rem;padding:10px 0;border:0;border-bottom:1px solid var(--line);border-radius:0;background:transparent;color:var(--ink);width:100%}textarea{min-height:96px;resize:vertical}input:focus,select:focus,textarea:focus{outline:none;border-bottom-color:var(--ink)}.row{display:grid;grid-template-columns:1fr 1fr;gap:20px}.msg{border:1px solid var(--line);border-radius:4px;padding:11px 15px;font-size:.89rem;background:var(--soft);color:var(--ink);display:none;max-width:520px}.msg.is-visible{display:block}.join{position:relative;display:inline-block}.join-panel{position:absolute;top:calc(100% + 12px);right:0;z-index:80;width:210px;padding:18px;border:1px solid var(--line);border-radius:var(--radius);background:var(--bg);text-align:center}.join[data-align=left] .join-panel{right:auto;left:0}.join-qr{width:100%;height:auto;border-radius:4px}.join-note{margin:12px 0 4px;font-size:.8rem;color:var(--muted);line-height:1.5}.join-id{margin:0;font-size:.92rem;font-weight:600}.cta-band{border-top:1px solid var(--line-soft);padding-top:52px;display:flex;align-items:flex-end;justify-content:space-between;gap:40px;flex-wrap:wrap}.cta-band h2{margin-bottom:8px}.cta-actions{display:flex;gap:22px;align-items:center;flex-wrap:wrap}.prose h2{margin-top:52px;font-size:1.4rem}.prose h3{margin-top:32px}.prose ul{color:var(--body);padding-left:18px;font-size:.96rem}.prose li{margin-bottom:7px}.prose table{width:100%;border-collapse:collapse;font-size:.92rem;margin:8px 0 22px}.prose th,.prose td{border-bottom:1px solid var(--line);padding:10px 12px 10px 0;text-align:left;color:var(--body)}.prose th{color:var(--ink)}.toc{margin:34px 0 0;padding-top:22px;border-top:1px solid var(--line-soft)}.toc h2{font-size:.72rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);margin-bottom:12px}.toc ol{margin:0;padding-left:20px;font-size:.93rem;color:var(--body)}.toc li{margin-bottom:5px}.toc a:hover{color:var(--link)}.site-footer{border-top:1px solid var(--line-soft);padding:60px 0 40px}.footer-grid{display:grid;grid-template-columns:minmax(0,1.6fr) minmax(0,1fr) minmax(0,1fr);gap:44px}.footer-grid .brand{white-space:normal}.footer-grid h4{font-size:.72rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);margin-bottom:14px;font-weight:600}.footer-grid ul{list-style:none;margin:0;padding:0;font-size:.9rem}.footer-grid li{margin-bottom:8px;color:var(--body)}.footer-grid a:hover{color:var(--ink)}.footer-hint{margin-top:52px;padding-top:20px;border-top:1px solid var(--line-soft);font-size:.82rem;color:var(--muted);display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap}@media(max-width:860px){.grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}.footer-grid{grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:28px}}@media(max-width:720px){body{font-size:16px}.section{padding:58px 0}.hero{padding:62px 0 46px}.nav{display:none;position:absolute;top:64px;left:0;right:0;background:var(--bg);border-bottom:1px solid var(--line);flex-direction:column;align-items:flex-start;gap:0;padding:14px 28px 22px}.nav.is-open{display:flex}.nav a{padding:11px 0;font-size:1rem}.nav-toggle{display:grid}.grid--2,.grid--3,.row{grid-template-columns:1fr}.footer-grid{grid-template-columns:minmax(0,1fr)}.cta-band{padding-top:40px}.join-panel{width:190px}}@media(max-width:520px){.wrap{padding:0 20px}.section{padding:48px 0}.section--tight{padding:40px 0}.hero{padding:48px 0 38px}h1{font-size:clamp(1.9rem,8.4vw,2.5rem)}h2{font-size:clamp(1.25rem,6vw,1.6rem)}.section-head{margin-bottom:26px}.header-inner{gap:10px}.brand{font-size:.95rem}.brand .zh{display:none}.header-actions{gap:2px}.nav.is-open{max-height:calc(100vh - 64px);overflow-y:auto}.hero-facts{gap:22px 30px;margin-top:34px}.hero-list{gap:6px}.cta-band{padding-top:34px;gap:22px}.faq-group{margin-bottom:30px}.site-footer{padding:44px 0 32px}.footer-hint{margin-top:36px}.join-panel{width:176px}input,select,textarea{font-size:16px}}.skip-link{position:absolute;left:-9999px}.skip-link:focus{left:12px;top:12px;background:var(--ink);color:var(--bg);padding:8px 14px;border-radius:4px;z-index:99}.visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}