:root{--bg:#f7f9fc;--surface:#fff;--surface2:#eef3f9;--ink:#0d1b2a;--muted:#55657a;--line:#dde5ef;--brand:#0b1f3a;--acc:#10b981;--acc2:#3b82f6;--acc-ink:#047857;--link:#1d4ed8;--warn-bg:#fff8eb;--warn-line:#f5d48a;--info-bg:#ecfdf5;--info-line:#a7f3d0;--code-bg:#0b1324;--code-ink:#e2e8f0;--shadow:0 1px 2px rgba(13,27,42,.06),0 8px 24px rgba(13,27,42,.06);--radius:14px;color-scheme:light dark}
@media (prefers-color-scheme:dark){:root{--bg:#0a0f1c;--surface:#111a2e;--surface2:#16213a;--ink:#e6ecf5;--muted:#9aa8bf;--line:#24324f;--brand:#070c18;--acc:#34d399;--acc2:#60a5fa;--acc-ink:#6ee7b7;--link:#7cb4ff;--warn-bg:#2a2210;--warn-line:#6b5420;--info-bg:#0c2a22;--info-line:#1f5b48;--code-bg:#060a14;--shadow:0 1px 2px rgba(0,0,0,.3),0 8px 24px rgba(0,0,0,.25)}}
*{box-sizing:border-box}html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:72px}
body{margin:0;font:17px/1.7 ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,"PingFang TC","PingFang SC","Noto Sans TC","Noto Sans SC","Microsoft JhengHei","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--bg);text-rendering:optimizeLegibility}
.wrap{max-width:1160px;margin:0 auto;padding:0 20px}
a{color:var(--link);text-underline-offset:2px}a:hover{text-decoration-thickness:2px}
.skip{position:absolute;left:-999px}.skip:focus{left:8px;top:8px;background:var(--surface);padding:6px 10px;z-index:99;border-radius:6px}
.ico{width:1em;height:1em;vertical-align:-.15em;flex:none;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
/* header */
.top{position:sticky;top:0;z-index:50;background:rgba(11,31,58,.92);backdrop-filter:saturate(1.4) blur(10px);-webkit-backdrop-filter:saturate(1.4) blur(10px);border-bottom:1px solid rgba(255,255,255,.08)}
.bar{display:flex;align-items:center;gap:18px;min-height:60px}
.brand{display:flex;align-items:center;gap:8px;color:#fff;font-weight:800;font-size:19px;letter-spacing:-.2px;text-decoration:none;white-space:nowrap}.brand span{color:var(--acc)}.brand .logo{width:26px;height:26px}
.nav{display:flex;gap:4px;overflow-x:auto;scrollbar-width:none}.nav::-webkit-scrollbar{display:none}
.nav a{color:#c9d6e8;text-decoration:none;font-size:14.5px;padding:7px 11px;border-radius:8px;white-space:nowrap}.nav a:hover{background:rgba(255,255,255,.08);color:#fff}.nav a[aria-current]{color:#fff;background:rgba(16,185,129,.18)}
.langs{display:flex;gap:2px;margin-left:auto;background:rgba(255,255,255,.07);border-radius:9px;padding:3px}
.langs a{color:#c9d6e8;text-decoration:none;font-size:13px;padding:4px 8px;border-radius:6px;white-space:nowrap}.langs a[aria-current]{background:#fff;color:#0b1f3a;font-weight:700}
.btn{display:inline-flex;align-items:center;gap:8px;font-weight:700;text-decoration:none;border-radius:10px;padding:11px 18px;line-height:1.2;transition:transform .12s ease,box-shadow .12s ease}
.btn:hover{transform:translateY(-1px)}
.btn-primary{background:linear-gradient(135deg,#10b981,#06b6d4);color:#03211a;box-shadow:0 6px 20px rgba(16,185,129,.28)}
.btn-ghost{border:1px solid var(--line);color:var(--ink);background:var(--surface)}
.top .btn-primary{padding:8px 14px;font-size:14px;box-shadow:none}
/* hero */
.hero{position:relative;color:#eaf1fb;background:radial-gradient(900px 420px at 85% -20%,rgba(59,130,246,.45),transparent 60%),radial-gradient(700px 380px at -5% 0%,rgba(16,185,129,.32),transparent 60%),linear-gradient(180deg,#0b1f3a,#0a1730);padding:40px 0 46px;overflow:hidden}
.hero:after{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.04) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.04) 1px,transparent 1px);background-size:36px 36px;mask-image:linear-gradient(180deg,#000,transparent 85%);-webkit-mask-image:linear-gradient(180deg,#000,transparent 85%);pointer-events:none}
.hero .wrap{position:relative;z-index:1}
.crumbs{font-size:13.5px;color:#a9b8cf}.crumbs a{color:#cfe0f5}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:600;letter-spacing:.3px;color:#a7f3d0;background:rgba(16,185,129,.12);border:1px solid rgba(16,185,129,.35);border-radius:99px;padding:4px 12px;margin:18px 0 6px}
.hero h1{font-size:clamp(30px,4.6vw,50px);line-height:1.12;letter-spacing:-.8px;margin:10px 0 14px;max-width:920px;background:linear-gradient(90deg,#fff 30%,#a7f3d0 70%,#93c5fd);-webkit-background-clip:text;background-clip:text;color:transparent}
.lead{font-size:clamp(16px,1.8vw,19px);color:#c3d0e4;max-width:780px;margin:0 0 22px}
.hero-cta{display:flex;flex-wrap:wrap;gap:12px;align-items:center}
.hero .btn-ghost{background:rgba(255,255,255,.06);border-color:rgba(255,255,255,.2);color:#fff}
.hero .meta{color:#9fb0c9;font-size:13.5px;margin:18px 0 0}
.hero .aff-note,.hero .aff-note a{color:#8fa1bb}
/* layout */
.layout{display:grid;grid-template-columns:minmax(0,1fr);gap:36px;padding-top:30px}
@media(min-width:1040px){.layout{grid-template-columns:250px minmax(0,1fr)}.toc{position:sticky;top:80px;align-self:start;max-height:calc(100vh - 100px);overflow:auto}}
article{min-width:0;max-width:820px}
h2{font-size:clamp(23px,2.6vw,30px);line-height:1.25;letter-spacing:-.4px;margin:46px 0 12px}
h3{font-size:19.5px;line-height:1.35;margin:26px 0 8px}
section>h2:before{content:"";display:block;width:42px;height:4px;border-radius:4px;background:linear-gradient(90deg,var(--acc),var(--acc2));margin-bottom:12px}
p,li{overflow-wrap:anywhere}
.toc{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:14px 16px;font-size:14px;box-shadow:var(--shadow)}
.toc h2{font-size:12px;text-transform:uppercase;letter-spacing:1px;color:var(--muted);margin:2px 0 8px}.toc h2:before{display:none}
.toc ol{list-style:none;margin:0;padding:0;counter-reset:t}.toc li{counter-increment:t;margin:2px 0}
.toc a{display:flex;gap:8px;text-decoration:none;color:var(--ink);padding:5px 8px;border-radius:8px;line-height:1.4}.toc a:before{content:counter(t,decimal-leading-zero);color:var(--acc-ink);font-weight:700;font-variant-numeric:tabular-nums;font-size:12px;padding-top:2px}.toc a:hover{background:var(--surface2)}
/* callouts */
.summary,.callout{position:relative;background:var(--info-bg);border:1px solid var(--info-line);border-radius:var(--radius);padding:6px 22px 10px 22px;margin:4px 0 8px}
.summary h2{display:flex;align-items:center;gap:8px;font-size:18px;margin:14px 0 6px;color:var(--acc-ink)}.summary h2:before{display:none}
.disclaimer{background:var(--warn-bg);border:1px solid var(--warn-line);border-radius:var(--radius);padding:4px 22px 10px;margin-top:40px}
.disclaimer h2{display:flex;align-items:center;gap:8px;font-size:20px;margin:16px 0 6px}.disclaimer h2:before{display:none}
.note{font-size:14.5px;color:var(--muted)}
p.note strong:first-child{color:var(--ink)}
article>section .note:first-child,.analysis-note{background:var(--surface2);border-left:4px solid var(--acc2);border-radius:8px;padding:10px 14px}
.aff-note{font-size:13.5px;color:var(--muted)}.aff-note a{color:var(--muted)}
.pbadge{font-size:10.5px;font-weight:700;letter-spacing:.3px;text-transform:uppercase;background:linear-gradient(135deg,#fde68a,#fcd34d);color:#5b4200;border-radius:99px;padding:1px 7px;vertical-align:middle;white-space:nowrap}
.cta{display:inline-flex;align-items:center;gap:8px;background:linear-gradient(135deg,#10b981,#06b6d4);color:#03211a;font-weight:800;padding:12px 20px;border-radius:10px;text-decoration:none;box-shadow:0 6px 20px rgba(16,185,129,.25)}.cta:hover{transform:translateY(-1px)}
.cta-wrap{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin:18px 0;padding:14px 16px;border:1px dashed var(--line);border-radius:var(--radius);background:var(--surface)}
.featured{position:relative;background:var(--surface);border:1px solid transparent;border-radius:var(--radius);padding:6px 22px 10px;margin:18px 0;background-image:linear-gradient(var(--surface),var(--surface)),linear-gradient(135deg,var(--acc),var(--acc2));background-origin:border-box;background-clip:padding-box,border-box;box-shadow:var(--shadow)}
.featured h3 .tag{font-size:11px;background:linear-gradient(135deg,var(--acc),var(--acc2));color:#fff;border-radius:99px;padding:2px 9px;margin-left:8px;vertical-align:middle}
/* cards */
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:14px;margin:22px 0 6px}
.card{display:flex;flex-direction:column;gap:6px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:16px;text-decoration:none;color:var(--ink);box-shadow:var(--shadow);transition:transform .12s ease,border-color .12s ease}
.card:hover{transform:translateY(-2px);border-color:var(--acc)}
.card b{font-size:17px}.card span{font-size:13.5px;color:var(--muted);line-height:1.45}
.mono{display:inline-grid;place-items:center;width:34px;height:34px;border-radius:10px;font-weight:800;font-size:14px;color:#fff;background:linear-gradient(135deg,var(--c1,#10b981),var(--c2,#3b82f6))}
.badge{align-self:flex-start;font-size:11px;font-weight:700;letter-spacing:.3px;border-radius:99px;padding:2px 9px;background:var(--surface2);color:var(--acc-ink);border:1px solid var(--line)}
.steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(145px,1fr));gap:12px;list-style:none;padding:0;margin:22px 0;counter-reset:s}
.steps li{counter-increment:s;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:14px;box-shadow:var(--shadow)}
.steps li a{text-decoration:none;color:var(--ink);font-weight:700;display:block}.steps li a:before{content:counter(s);display:inline-grid;place-items:center;width:26px;height:26px;border-radius:50%;background:linear-gradient(135deg,var(--acc),var(--acc2));color:#fff;font-size:13px;margin-right:8px}
.steps li span{display:block;font-size:13.5px;color:var(--muted);margin-top:6px;line-height:1.45}
/* tables */
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);box-shadow:var(--shadow);margin:14px 0}
table{border-collapse:collapse;width:100%;font-size:14.5px}
.table-wrap table{margin:0}
th,td{padding:10px 12px;vertical-align:top;text-align:left;border-bottom:1px solid var(--line)}
thead th{position:sticky;top:0;background:var(--surface2);font-size:12.5px;text-transform:uppercase;letter-spacing:.5px;color:var(--muted);white-space:nowrap}
tbody tr:nth-child(even){background:color-mix(in srgb,var(--surface2) 45%,transparent)}tbody tr:hover{background:var(--surface2)}
tbody td:first-child{font-weight:650}
caption{text-align:left;font-size:13px;color:var(--muted);padding:10px 12px}
/* code */
pre{position:relative;background:var(--code-bg);color:var(--code-ink);border:1px solid #1e2a44;padding:38px 16px 14px;border-radius:12px;overflow-x:auto;font-size:13.5px;line-height:1.6;box-shadow:var(--shadow);margin:16px 0}
pre:before{content:"";position:absolute;top:13px;left:14px;width:10px;height:10px;border-radius:50%;background:#ff5f57;box-shadow:16px 0 0 #febc2e,32px 0 0 #28c840}
pre code{background:none;color:inherit;padding:0;border:0;font-size:inherit}
code{font-family:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Liberation Mono",monospace;font-size:.88em;background:var(--surface2);border:1px solid var(--line);padding:1px 5px;border-radius:6px}
/* misc */
.cite{font-size:11px;line-height:0}.cite a{text-decoration:none;font-weight:700}
.qa{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:4px 18px 8px;margin:10px 0}.qa h3{margin:12px 0 4px;font-size:17px}.qa p{margin:0 0 6px;color:var(--muted)}
.about,.aff{font-size:15px}.aff{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:2px 20px 8px;margin-top:20px}.aff h2:before,.about h2:before,.sources h2:before{display:none}
.sources{font-size:13.5px}.sources ol{padding-left:22px}.sources li{margin:4px 0;word-break:break-word}
.next{display:flex;flex-wrap:wrap;gap:10px;font-weight:700;margin:34px 0}.next a{display:inline-flex;padding:12px 16px;border-radius:12px;border:1px solid var(--line);background:var(--surface);text-decoration:none;box-shadow:var(--shadow)}
.foot{margin-top:56px;background:var(--brand);color:#a9b8cf;font-size:14px}.foot .wrap{padding:26px 20px}.foot a{color:#d6e4f5}.foot .nav{flex-wrap:wrap;overflow:visible}.foot .nav a{padding:4px 8px}
@media(max-width:760px){body{font-size:16.5px}.bar{flex-wrap:wrap;gap:8px 12px;padding:8px 0}.nav{order:3;width:100%;margin:0 -6px}.langs{margin-left:auto}.top .btn-primary{display:none}.hero{padding:26px 0 32px}.summary,.disclaimer,.featured,.callout,.aff{padding-left:16px;padding-right:16px}th,td{padding:8px 10px}}
@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}
.sr-h{font-size:20px;margin:34px 0 0}.sr-h:before{display:none}
.card em.badge{font-style:normal}
.mono{color:#fff!important;font-size:14px!important}
@media(max-width:760px){html{scroll-padding-top:110px}}
.toc a:before{flex:none;min-width:20px;white-space:nowrap;overflow-wrap:normal;word-break:keep-all}.toc li{overflow-wrap:normal}
@media(min-width:1040px){.steps{grid-template-columns:repeat(5,1fr)}}
.plan-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:14px;margin:14px 0 6px}.plan{position:relative;display:flex;flex-direction:column;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:16px;box-shadow:var(--shadow)}.plan.hot{border-color:var(--acc);box-shadow:0 0 0 1px var(--acc) inset,var(--shadow)}.plan-pop{position:absolute;top:-10px;right:12px;font-size:11px;font-weight:700;background:linear-gradient(135deg,var(--acc),var(--acc2));color:#fff;border-radius:99px;padding:2px 9px}.plan-name{font-size:17px}.plan-amt{font-size:28px;font-weight:800;margin:4px 0}.plan-amt small{font-size:14px;color:var(--muted);font-weight:500}.plan ul{flex:1;margin:6px 0 14px;padding-left:18px;font-size:14px;color:var(--muted)}.plan-cta{justify-content:center;margin-top:auto;width:100%;text-align:center}.btn-outline{border:1.5px solid var(--acc);color:var(--acc-ink);background:transparent}.btn-outline:hover{background:var(--info-bg)}.plan-cta:focus-visible{outline:3px solid var(--acc2);outline-offset:2px}.plan-h{margin-top:22px}.gl-list{margin:0}.gl-item{padding:12px 0;border-bottom:1px solid var(--line,#e5e7eb)}.gl-item dt{font-weight:700;margin:0 0 4px}.gl-item dd{margin:0;color:var(--muted)}.gl-rel{padding-left:20px}.gl-rel li{margin:6px 0}dfn{font-style:normal}a.xl{text-decoration-style:dotted}.calc{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:18px;margin:14px 0}.calc-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:12px 16px;margin-bottom:12px}.fld label{display:block;font-weight:700;font-size:14px;margin-bottom:4px}.fld small{display:block;color:var(--muted);font-size:12.5px;margin-top:4px}.calc input,.calc select{font:inherit;font-size:16px;width:100%;box-sizing:border-box;padding:10px 12px;border:1px solid var(--line);border-radius:10px;background:var(--bg);color:var(--ink)}.calc input:focus-visible,.calc select:focus-visible,.calc button:focus-visible{outline:3px solid var(--acc2);outline-offset:2px}.calc button{font:inherit;cursor:pointer;border:0}.calc .btn-ghost{background:var(--surface2);color:var(--ink);border:1px solid var(--line)}.calc-btns{display:flex;flex-wrap:wrap;gap:8px;margin:4px 0 12px}.calc-out{display:block;min-height:3em}.calc-out .table-wrap{margin:10px 0}.calc-verdict{font-weight:700;margin:8px 0}.calc-verdict.ok{color:var(--acc-ink)}.calc-verdict.no{color:var(--muted)}.calc-err{color:#b91c1c}@media (prefers-color-scheme:dark){.calc-err{color:#fca5a5}}.calc [hidden]{display:none}.tut-need{background:var(--surface2);border-radius:12px;padding:12px 16px;margin:12px 0}.tut-status{border-left:4px solid var(--acc2);padding:8px 14px;background:var(--surface2);border-radius:8px;font-size:14.5px}.cmp-verdict{border:2px solid var(--acc);border-radius:var(--radius);padding:4px 20px 8px;margin:10px 0}.cmp-cta{display:flex;flex-wrap:wrap;gap:10px 18px;align-items:center;margin:8px 0}.cmp-tbl th[scope=row]{text-align:left;font-weight:600;min-width:9em}.cmp-tbl td{vertical-align:top;font-size:14.5px}.cmp-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:14px}.cmp-grid>div{background:var(--surface2);border-radius:12px;padding:6px 16px}.cmp-grid h3{margin:.6em 0 .3em;font-size:17px}