:root{--bg:#0f1113;--panel:#171a1e;--line:#262b31;--text:#f4f7fb;--muted:#9aa4b2;--body:#c7cfd9;--accent:#2f80ff;--accent-2:#1d6ae0;--gold:#f2b84b;--ok:#3ccf91;--bad:#ff6b6b;color-scheme:dark}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font:16px/1.65 -apple-system,"system-ui","Segoe UI","PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;-webkit-font-smoothing:antialiased}
a{color:var(--accent)}
.wrap{max-width:1080px;margin:0 auto;padding:0 16px}
.skip{position:absolute;left:-999px}.skip:focus{left:16px;top:8px;background:var(--panel);padding:6px 10px;z-index:9}
.nav{position:sticky;top:0;z-index:5;background:rgba(15,17,19,.88);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav-in{display:flex;align-items:center;gap:20px;height:60px}
.brand{display:flex;align-items:center;gap:8px;color:var(--text);text-decoration:none;font-weight:650;white-space:nowrap}
.brand em{font-style:normal;color:var(--muted);font-weight:500}
.nav nav{display:flex;gap:18px;margin-left:8px;flex:1;overflow-x:auto;scrollbar-width:none}
.nav nav a{color:var(--muted);text-decoration:none;font-size:14px;white-space:nowrap}.nav nav a:hover{color:var(--text)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;background:var(--accent-2);color:#fff;text-decoration:none;border-radius:8px;padding:11px 18px;font-weight:600;border:1px solid transparent;white-space:nowrap}
.btn:hover{background:var(--accent)}
.btn-sm{padding:7px 12px;font-size:14px}
.btn-ghost{background:transparent;border-color:var(--line);color:var(--text)}.btn-ghost:hover{background:var(--panel)}
.hero{padding:72px 0 40px;background:radial-gradient(900px 380px at 70% -10%,rgba(47,128,255,.18),transparent 70%)}
.eyebrow{color:var(--accent);font-size:13px;letter-spacing:.06em;margin:0 0 10px}
h1{font-size:clamp(30px,5vw,48px);line-height:1.15;margin:0 0 18px;font-weight:700}
h1 span{display:block;color:var(--muted);font-weight:500;font-size:.6em;margin-top:8px}
.lead{max-width:740px;color:#cfd6df;font-size:17px;margin:0 0 26px}
.cta{display:flex;flex-wrap:wrap;gap:12px;align-items:center}
.stats{list-style:none;padding:0;margin:40px 0 0;display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
.stats li{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:16px}
.stats b{display:block;font-size:24px;font-variant-numeric:tabular-nums}
.stats span{color:var(--muted);font-size:13px}
.points{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;padding-top:24px;padding-bottom:16px}
.points article{border-top:2px solid var(--accent);padding-top:14px}
.points h2{font-size:18px;margin:0 0 8px}.points p{margin:0;color:var(--body);font-size:15px}
.block{padding-top:56px}
.h{font-size:24px;margin:0 0 20px}
.card{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:20px}
.mt{margin-top:16px}
.how{display:grid;grid-template-columns:1.1fr 1fr;gap:24px;align-items:center}
.diagram{width:100%;height:auto;background:var(--panel);border:1px solid var(--line);border-radius:14px}
.d-axis{stroke:#5c88d6;stroke-width:1.5}.d-band{stroke:#5a6270;stroke-dasharray:6 6}.d-line{fill:none;stroke:var(--text);stroke-width:2.5}
.d-short{fill:var(--bad)}.d-long{fill:var(--ok)}.d-tp{fill:var(--gold)}.d-t{fill:var(--muted);font-size:12px}
.steps-plain{margin:0;padding-left:20px;color:var(--body)}.steps-plain li{margin-bottom:10px}.steps-plain b{color:var(--text)}
.shot{padding:12px;margin:0}.shot img{display:block;width:100%;height:auto;border-radius:8px}
.shot figcaption{color:var(--muted);font-size:14px;margin:12px 4px 2px}
.ch{margin:0 0 8px;font-size:16px;color:var(--muted);font-weight:600}
.chart{width:100%;height:auto;display:block}
.grid{stroke:#232830}.ax{fill:var(--muted);font-size:12px}
.ln{fill:none;stroke-width:2;stroke-linejoin:round}.ln-balanced{stroke-width:3}
.ln-steady{stroke:#7fb3ff}.ln-balanced{stroke:#2f80ff}.ln-mid{stroke:#f2b84b}
.legend{list-style:none;padding:0;margin:16px 0 0;display:flex;flex-wrap:wrap;gap:12px 28px}
.legend li{display:flex;align-items:baseline;gap:8px}.legend b{font-variant-numeric:tabular-nums}.legend small{color:var(--muted)}
.dot{width:10px;height:10px;border-radius:50%;display:inline-block}
.dot-steady{background:#7fb3ff}.dot-balanced{background:#2f80ff}.dot-mid{background:#f2b84b}
.note{color:var(--muted);font-size:13px;margin:14px 0 0}
.presets{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.presets h3{margin:0 0 8px;font-size:18px}.presets h3 small{font-size:12px;color:var(--accent);margin-left:6px}
.presets p{margin:0;color:var(--body)}.presets .on,.prices .on{border-color:var(--accent)}
.sub{color:var(--muted);margin:14px 0 0;font-size:14px}.sub.top{margin:-8px 0 16px}
.steps{list-style:none;counter-reset:s;padding:0;margin:0;display:grid;gap:12px}
.steps li{counter-increment:s;background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:18px 18px 18px 60px;position:relative}
.steps li::before{content:counter(s);position:absolute;left:18px;top:18px;width:28px;height:28px;border-radius:50%;background:var(--accent-2);display:grid;place-items:center;font-weight:700;font-size:14px}
.steps h3{margin:0 0 4px;font-size:17px}.steps p{margin:0;color:var(--body)}
code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:14px;background:#0b0d0f;border:1px solid var(--line);border-radius:6px;padding:1px 6px;word-break:break-all}
.copy{display:flex;gap:8px;align-items:center;margin-top:10px;flex-wrap:wrap}
.copy code{padding:8px 10px;flex:1;min-width:0}
.copy button{background:var(--line);color:var(--text);border:0;border-radius:8px;padding:8px 14px;font:inherit;font-size:14px;cursor:pointer}
.copy button:hover{background:#333a42}
.req{margin-top:16px}.req h3,.trial h3{margin:0 0 6px;font-size:17px}.req p,.trial p{margin:0;color:var(--body)}
.trial{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.kv{list-style:none;padding:0;margin:0 0 16px;display:grid;gap:10px}
.kv li{display:grid;grid-template-columns:56px 1fr;gap:10px}.kv b{color:var(--text)}.kv span{color:var(--body)}
.qq{color:var(--muted)}
.prices{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.prices .card{display:flex;flex-direction:column;gap:4px}
.prices small{color:var(--muted)}.prices b{font-size:34px;line-height:1.2;font-variant-numeric:tabular-nums}.prices span{color:var(--muted);font-size:14px}
.prices ul{margin:12px 0 18px;padding-left:18px;color:var(--body);flex:1}.prices .btn{align-self:flex-start}
.faq{display:grid;gap:10px}
.faq details{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:14px 18px}
.faq summary{cursor:pointer;font-weight:600}.faq p{margin:10px 0 0;color:var(--body)}
.comm{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
.comm.three{grid-template-columns:repeat(3,1fr)}
.comm .card{text-decoration:none;color:var(--text);display:flex;flex-direction:column;gap:4px}
.comm .card:hover{border-color:#3a414a}.comm small{color:var(--muted)}.comm span{color:var(--muted);font-size:14px}
.comm .here{border-color:var(--accent)}
.foot{border-top:1px solid var(--line);margin-top:64px;padding:24px 0;color:var(--muted);font-size:14px}
.foot a{color:var(--muted)}
.guide{max-width:860px;padding-top:32px}
.guide h1{font-size:32px}.guide h2{font-size:22px;margin:40px 0 12px;padding-top:8px;border-top:1px solid var(--line)}
.guide p,.guide li{color:var(--body)}.guide b{color:var(--text)}.guide ul,.guide ol{padding-left:22px}.guide li{margin:6px 0}
.note-box{background:var(--panel);border:1px solid var(--line);border-left:3px solid var(--gold);border-radius:8px;padding:12px 16px}
.tbl{overflow-x:auto;margin:12px 0}.guide table{border-collapse:collapse;width:100%;font-size:15px}
.guide th,.guide td{border:1px solid var(--line);padding:8px 10px;text-align:left;vertical-align:top}.guide th{background:var(--panel);color:var(--text)}
@media (max-width:860px){.stats{grid-template-columns:repeat(2,1fr)}.points,.presets,.how,.trial,.prices{grid-template-columns:1fr}.comm,.comm.three{grid-template-columns:1fr 1fr}}
@media (max-width:560px){.nav nav{display:none}.comm,.comm.three{grid-template-columns:1fr}.hero{padding-top:48px}}