:root{--bg: #ffffff;--surface: #f5f7fa;--border: #dde2ea;--text: #0f172a;--muted: #566173;--primary: #1d4ed8;--on-primary: #ffffff;--up: #0f7a55;--down: #b42318;--accent: #1d4ed8;--track: #e3e8f0;--primary-soft: rgba(29, 78, 216, .09);--primary-fill: #c9d6f7;--up-soft: rgba(15, 122, 85, .1);--down-soft: rgba(180, 35, 24, .08);--header-bg: rgba(255, 255, 255, .94);--hero-glow: rgba(29, 78, 216, .08);--mask: rgba(15, 23, 42, .45);--s1: var(--surface);--s2: #eef1f5;--s3: #e9edf3;--hair: #e6eaf0;--subtle: var(--muted);--cyan: var(--primary);--cyan-soft: var(--primary-soft);--primary-hover: #1e40af;--amber: #9a5b00;--long: var(--up);--long-soft: var(--up-soft);--long-solid: var(--up);--short: var(--down);--short-text: var(--down);--short-soft: var(--down-soft);--short-solid: var(--down);--flat-solid: #566173;--r-sm: 6px;--r-md: 8px;--r-lg: 12px;--sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", "Noto Sans SC", "Noto Sans TC", "Hiragino Sans GB", "WenQuanYi Zen Hei", sans-serif;--mono: "JetBrains Mono", ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", "DejaVu Sans Mono", monospace;--wrap: 1200px;--gutter: 24px;--sticky-h: 66px;--safe-b: env(safe-area-inset-bottom, 0px);color-scheme:light}@media(prefers-color-scheme:dark){:root{--bg: #0d1117;--surface: #161b22;--border: #2a313c;--text: #e6eaf0;--muted: #9aa4b2;--primary: #6b9bff;--on-primary: #0d1117;--up: #3fb984;--down: #f47067;--accent: #6b9bff;--track: #262d38;--primary-soft: rgba(107, 155, 255, .13);--primary-fill: #2a3d66;--up-soft: rgba(63, 185, 132, .14);--down-soft: rgba(244, 112, 103, .13);--header-bg: rgba(13, 17, 23, .94);--hero-glow: rgba(107, 155, 255, .1);--mask: rgba(1, 4, 9, .7);--s2: #1b212a;--s3: #212833;--hair: #222a35;--primary-hover: #8fb3ff;--amber: #f0b44c;--flat-solid: #334155;color-scheme:dark}}*{box-sizing:border-box;margin:0;padding:0}html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}body{background:var(--bg);color:var(--text);font-family:var(--sans);line-height:1.5;-webkit-font-smoothing:antialiased;font-variant-numeric:tabular-nums;overflow-x:hidden}a{color:inherit;text-decoration:none}button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}:focus-visible{outline:2px solid var(--cyan);outline-offset:2px}.num{font-family:var(--sans);font-variant-numeric:tabular-nums}.site{min-height:100vh;overflow-x:clip}.wrap{width:100%;max-width:calc(var(--wrap) + 2 * var(--gutter));margin:0 auto;padding:0 var(--gutter)}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}.env-banner{height:22px;display:flex;align-items:center;justify-content:center;font-size:11.5px;font-weight:700;letter-spacing:.02em;color:#fff;background:repeating-linear-gradient(-45deg,#6d28d9 0,#6d28d9 12px,#7c3aed 12px,#7c3aed 24px);border-bottom:1px solid #4c1d95;white-space:nowrap;overflow:hidden}.risk-bar{background:var(--s2);color:var(--subtle);border-bottom:1px solid var(--hair);font-size:12px;padding:6px var(--gutter);text-align:center}.risk-bar a{text-decoration:underline;color:var(--muted);margin-left:4px;white-space:nowrap}.logo{display:inline-flex;align-items:center;gap:8px;font-weight:800;font-size:18px;letter-spacing:-.01em;white-space:nowrap}.logo .mark{width:28px;height:28px;flex:none;display:block}.btn{display:inline-flex;align-items:center;justify-content:center;height:44px;padding:0 22px;border-radius:var(--r-md);font-weight:700;font-size:15px;white-space:nowrap;transition:background-color .15s}.btn.pri{background:var(--primary);color:var(--on-primary)}.btn.pri:hover{background:var(--primary-hover)}.btn.sec{border:1px solid var(--border);color:var(--text);background:var(--s1)}.btn.sec:hover{background:var(--s3)}.btn.sm{height:36px;padding:0 16px;font-size:14px}.btn.lg{height:50px;padding:0 30px}.lang{position:relative;flex:none}.lang-btn{display:inline-flex;align-items:center;gap:5px;height:32px;padding:0 8px;font-size:13px;color:var(--text);border:1px solid var(--border);border-radius:var(--r-sm)}.lang-btn:hover{background:var(--s3)}.lang-btn[aria-expanded=true]{border-color:var(--cyan)}.lang-btn svg{width:16px;height:16px}.lang-btn svg:last-child{width:12px;height:12px;color:var(--subtle)}.lang-list{position:absolute;right:0;top:calc(100% + 4px);z-index:60;min-width:160px;margin:0;padding:4px;list-style:none;background:var(--s1);border:1px solid var(--border);border-radius:var(--r-md);box-shadow:0 12px 28px #0f172a2e}.lang-list button{width:100%;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:8px 10px;border-radius:var(--r-sm);color:var(--text);font-size:14px;text-align:left}.lang-list button:hover{background:var(--s3)}.lang-list 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summary{list-style:none;cursor:pointer;display:flex;justify-content:space-between;align-items:center;gap:12px;font-weight:600}.faq-item summary::-webkit-details-marker{display:none}.faq-item summary:after{content:"+";color:var(--subtle);font-weight:400;font-size:18px;flex:none}.faq-item[open] summary:after{content:"−"}.faq-item p{color:var(--muted);font-size:14px;margin-top:8px}footer{background:var(--s2);border-top:1px solid var(--border);color:var(--subtle);font-size:13px}footer .links{display:flex;flex-wrap:wrap;gap:8px 24px;color:var(--muted)}footer .links a:hover{color:var(--text)}footer .risk-full{line-height:1.7}footer .tbd{display:inline-block;font-size:13px}.legal{padding:40px 0 64px}.legal .review{display:flex;gap:10px;align-items:flex-start;border:1px dashed var(--amber);color:var(--amber);background:#fbbf240f;border-radius:var(--r-md);padding:12px 16px;font-size:14px;margin-bottom:24px}.legal .review b{white-space:nowrap}.legal h1{font-size:30px;font-weight:800;letter-spacing:-.01em}.legal .updated{color:var(--subtle);font-size:13px;margin-top:6px}.legal .intro p,.legal section p{color:var(--muted);margin-top:10px;font-size:15px;line-height:1.75;overflow-wrap:anywhere}.legal .intro{margin-top:20px}.legal section{margin-top:28px}.legal section h2{font-size:18px;font-weight:700;scroll-margin-top:80px}.legal .toc{margin-top:24px;padding:16px 20px}.legal .toc h2{font-size:14px;color:var(--subtle);font-weight:600;margin-bottom:8px}.legal .toc ol{list-style:none;display:grid;gap:4px 24px}.legal .toc a{color:var(--cyan);font-size:14px}.legal .back{display:inline-block;margin-top:36px;color:var(--cyan)}.is-desktop header.top{height:64px;border-bottom:1px solid var(--hair);background:var(--header-bg);position:sticky;top:0;z-index:20;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}.is-desktop header.top .wrap{display:flex;align-items:center;height:100%;gap:36px}.is-desktop header.top nav{display:flex;gap:26px;color:var(--muted);font-size:14px;flex:1;min-width:0}.is-desktop header.top nav a:hover{color:var(--text)}.is-desktop header.top .right{display:flex;align-items:center;gap:12px}.is-desktop .hero{padding:56px 0 64px;background:radial-gradient(800px 360px at 80% 20%,var(--hero-glow),transparent 60%)}.is-desktop .hero .wrap{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,560px);gap:56px;align-items:center}.is-desktop .hero h1{font-size:52px;line-height:1.15;font-weight:800;letter-spacing:-.02em}.is-desktop .hero h1 em{font-style:normal;color:var(--cyan)}.is-desktop .hero .sub{color:var(--muted);font-size:17px;margin:18px 0 28px;max-width:520px}.is-desktop .cta{display:flex;gap:12px;flex-wrap:wrap}.is-desktop .points{display:flex;flex-wrap:wrap;gap:8px 22px;margin-top:28px;color:var(--subtle);font-size:13px}.is-desktop .points span:before{content:"✓ ";color:var(--long)}.is-desktop section.blk{padding:72px 0;border-top:1px solid var(--hair);scroll-margin-top:64px}.is-desktop .grid2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin-top:28px}.is-desktop .hero-note{padding:48px 28px;text-align:center;color:var(--muted);font-size:18px}.is-desktop .grid2 .card{padding:22px}.is-desktop .grid2 .ico{margin-bottom:14px}.is-desktop .steps{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;margin-top:28px}.is-desktop .step{position:relative;padding:22px 22px 22px 74px}.is-desktop .step .n{position:absolute;left:22px;top:22px;width:36px;height:36px;border-radius:50%;border:1px solid var(--cyan);color:var(--cyan);display:grid;place-items:center;font-weight:800}.is-desktop .grid-safe{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px;margin-top:28px}.is-desktop .grid-safe .card{padding:22px}.is-desktop .grid-safe .ico{margin-bottom:14px}.is-desktop .license{margin-top:16px}.is-desktop 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.list{display:grid;gap:10px;margin-top:16px}.is-mobile .list .card{padding:16px;display:grid;grid-template-columns:36px minmax(0,1fr);gap:12px}.is-mobile .card h3{font-size:15px;margin-bottom:2px}.is-mobile .card p{font-size:13px}.is-mobile .steps{margin-top:16px;border-left:2px solid var(--border);margin-left:14px;padding-left:20px;display:grid;gap:18px}.is-mobile .step{position:relative}.is-mobile .step .n{position:absolute;left:-36px;top:0;width:28px;height:28px;border-radius:50%;background:var(--bg);border:1px solid var(--cyan);color:var(--cyan);display:grid;place-items:center;font-size:13px}.is-mobile .step h3{font-size:15px}.is-mobile .step p{color:var(--muted);font-size:13px}.is-mobile .license{margin-top:12px;font-size:13px}.is-mobile .faq{margin-top:14px}.is-mobile .faq-item{padding:14px 0;border-bottom:1px solid var(--hair)}.is-mobile .final{text-align:center;padding-bottom:24px}.is-mobile footer{margin-top:32px;padding:24px 16px;font-size:12px}.is-mobile footer .links{margin:12px 0;font-size:13px;gap:8px 18px}.is-mobile footer .meta{margin-top:10px;display:grid;gap:10px;justify-items:start}.is-mobile .sticky-cta{position:fixed;left:0;right:0;bottom:0;z-index:25;padding:10px 16px calc(10px + var(--safe-b));background:var(--header-bg);border-top:1px solid var(--border);display:grid;grid-template-columns:1fr 2fr;gap:10px}.is-mobile .sticky-cta .btn{height:46px}.is-mobile .legal{padding:24px 0 40px}.is-mobile .legal h1{font-size:24px}.is-mobile .legal section h2{font-size:16px}.is-mobile .legal .intro p,.is-mobile .legal section p{font-size:14px}.is-desktop .legal .wrap{max-width:860px}.is-desktop .legal .toc ol{grid-template-columns:repeat(2,minmax(0,1fr))}.ex-card{padding:18px 20px;display:flex;flex-direction:column;gap:10px;text-align:left}.ex-meta{display:flex;align-items:center;gap:8px;font-size:12.5px;color:var(--muted)}.ex-tag{font-size:11.5px;font-weight:700;color:var(--primary);background:var(--primary-soft);border-radius:999px;padding:2px 8px}.ex-title{font-size:17px}.ex-rows{display:flex;flex-direction:column;gap:7px}.ex-row{position:relative;display:grid;grid-template-columns:minmax(0,1fr) auto 54px;align-items:center;gap:8px;height:38px;padding:0 12px;border-radius:9px;background:var(--track);overflow:hidden;font-size:14.5px}.ex-bar{position:absolute;left:0;top:0;bottom:0;background:var(--primary-fill)}.ex-row>:not(.ex-bar){position:relative}.ex-row b{color:var(--primary);font-size:15px}.ex-row small{color:var(--muted);text-align:right;font-size:13px}.ex-foot{font-size:13px;color:var(--accent);font-weight:600}.ex-calc{font-weight:700;color:var(--up);background:var(--up-soft);border-radius:var(--r-md);padding:9px 12px;font-size:14px}.card p.ex-note,.ex-note{font-size:12px;color:var(--muted)}.fee-table{border:1px solid var(--border);border-radius:var(--r-lg);background:var(--s1);padding:6px 18px}.fee-table>div{display:flex;justify-content:space-between;gap:12px;padding:11px 0;border-bottom:1px solid var(--hair);font-size:15px}.fee-table>div:last-child{border-bottom:0}.fee-table dt{color:var(--muted)}.fee-table .strong dt{color:var(--text);font-weight:700}.fee-table .strong dd{color:var(--up);font-weight:800;font-size:18px}.fee-note{color:var(--muted);font-size:13.5px;margin-top:14px}.ico{color:var(--primary)}.is-desktop .hero .wrap{grid-template-columns:minmax(0,1fr) minmax(0,480px)}.is-desktop .grid4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px;margin-top:28px}.is-desktop .grid4 .card{padding:22px}.is-desktop .grid4 .ico{margin-bottom:14px}.is-desktop #how .steps{margin-top:20px}.is-desktop .fee-wrap{display:grid;grid-template-columns:minmax(0,1fr) 460px;gap:56px;align-items:center}.is-mobile .hero .ex-card{margin-top:22px}.is-mobile .fee-table{margin-top:16px;padding:4px 14px}.is-mobile .fee-table>div{font-size:14px}