/* ============================================================
   lxisi — shared stylesheet
   多页面站点：首页 / 下载 / 教程 / 联系
   ============================================================ */

:root{
  --bg:#060b14;
  --bg-2:#0a1220;
  --panel:#0d1729;
  --panel-2:#111e34;
  --line:rgba(120,170,255,.10);
  --line-2:rgba(120,170,255,.20);
  --text:#e3ecfa;
  --muted:#8b9dba;
  --dim:#5b6c87;
  --accent:#3b9eff;
  --accent-2:#6fc3ff;
  --accent-soft:rgba(59,158,255,.12);
  --accent-line:rgba(59,158,255,.34);
  --ok:#34d399;
  --logo-bg:#0b1626;
  --logo-fg:#dce9fb;
  --overlay:rgba(255,255,255,.030);
  --overlay-2:rgba(255,255,255,.060);
  --shadow-card:0 1px 2px rgba(0,0,0,.30);
  --radius:12px;
  --max:1120px;
  --nav-h:64px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  font-size:15.5px;
  line-height:1.75;
  letter-spacing:.008em;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img,svg{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4{margin:0;line-height:1.25;letter-spacing:-.018em;font-weight:640}
p{margin:0}
code{
  font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  font-size:.9em;
  background:rgba(255,255,255,.055);
  padding:1.5px 6px;
  border-radius:4px;
  color:var(--accent-2);
}
::selection{background:rgba(59,158,255,.32);color:#fff}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:4px}

/* ---------- layout ---------- */
.wrap{width:100%;max-width:var(--max);margin:0 auto;padding:0 24px}
.wrap-narrow{max-width:820px}
main{position:relative;z-index:1}

.page-head{padding:calc(var(--nav-h) + 56px) 0 44px}
.page-head h1{font-size:clamp(30px,4.2vw,46px);margin-bottom:14px}
.page-head p{color:var(--muted);font-size:16px;max-width:62ch}

.section{padding:64px 0}
.section-sm{padding:40px 0}
.section + .section{border-top:1px solid var(--line)}
.section h2{font-size:clamp(22px,2.6vw,28px);margin-bottom:14px}
.section h3{font-size:17.5px;margin:28px 0 10px}
.section p{color:var(--muted);margin-bottom:14px}
.section p:last-child{margin-bottom:0}

/* ---------- nav ---------- */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:100;
  height:var(--nav-h);
  border-bottom:1px solid transparent;
  transition:background .25s var(--ease),border-color .25s;
}
.nav.solid,
.nav.scrolled{
  background:rgba(10,11,14,.86);
  backdrop-filter:blur(14px) saturate(150%);
  -webkit-backdrop-filter:blur(14px) saturate(150%);
  border-bottom-color:var(--line);
}
.nav-in{display:flex;align-items:center;height:var(--nav-h);gap:26px}
.brand{display:flex;align-items:center;gap:10px;font-weight:660;font-size:16.5px;flex-shrink:0}
.brand .mark{
  width:36px;height:36px;flex-shrink:0;display:block;
  color:var(--logo-fg);
}
.nav-links{display:flex;align-items:center;gap:2px;margin-left:auto}
.nav-links a{
  font-size:14px;color:var(--muted);padding:7px 13px;border-radius:7px;
  transition:color .16s,background .16s;white-space:nowrap;
}
.nav-links a:hover{color:var(--text);background:rgba(255,255,255,.045)}
.nav-links a.current{color:var(--accent);background:var(--accent-soft)}
.nav-gh{
  display:inline-flex;align-items:center;gap:6px;font-size:13.5px;
  padding:6px 12px;border-radius:7px;border:1px solid var(--line-2);
  color:var(--muted);margin-left:10px;transition:all .16s;
}
.nav-gh:hover{color:var(--text);border-color:rgba(255,255,255,.26)}
.burger{display:none;background:none;border:0;color:var(--text);padding:8px;cursor:pointer;margin-left:auto}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-size:14.5px;font-weight:600;padding:11px 22px;border-radius:9px;
  border:1px solid transparent;cursor:pointer;
  transition:transform .16s var(--ease),box-shadow .2s,background .18s,border-color .18s;
}
.btn-primary{background:var(--accent);color:#04121f;box-shadow:0 4px 18px rgba(59,158,255,.22)}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 8px 26px rgba(59,158,255,.34)}
.btn-outline{border-color:var(--line-2);color:var(--text);background:rgba(255,255,255,.025)}
.btn-outline:hover{background:rgba(255,255,255,.06);border-color:rgba(255,255,255,.24)}
.btn-sm{padding:7px 15px;font-size:13.5px;border-radius:7px}
.btn[disabled]{opacity:.45;pointer-events:none}


/* ---------- 白天模式 ---------- */
html[data-theme="light"]{
  --bg:#f4f7fc;
  --bg-2:#ffffff;
  --panel:#ffffff;
  --panel-2:#eef4fc;
  --line:rgba(16,42,80,.11);
  --line-2:rgba(16,42,80,.20);
  --text:#0d1929;
  --muted:#51647c;
  --dim:#7f93aa;
  --accent:#0d74e8;
  --accent-2:#2f8ff5;
  --accent-soft:rgba(13,116,232,.08);
  --accent-line:rgba(13,116,232,.30);
  --ok:#0f9e6a;
  --logo-bg:#0b1424;
  --logo-fg:#ffffff;
  --overlay:rgba(16,42,80,.040);
  --overlay-2:rgba(16,42,80,.070);
  --shadow-card:0 1px 3px rgba(16,42,80,.07), 0 10px 30px rgba(16,42,80,.05);
}
html[data-theme="light"] body{background:var(--bg)}
html[data-theme="light"] .nav{
  background:rgba(244,247,252,.86);
  border-bottom-color:var(--line);
}
html[data-theme="light"] .nav.solid{background:rgba(244,247,252,.92)}
html[data-theme="light"] .hero::before{
  background:radial-gradient(ellipse at 50% 50%,rgba(13,116,232,.10),transparent 62%);
}
html[data-theme="light"] .card{
  background:var(--panel);
  box-shadow:var(--shadow-card);
}
html[data-theme="light"] .card:hover{
  background:var(--panel);
  box-shadow:0 2px 6px rgba(16,42,80,.09), 0 16px 40px rgba(16,42,80,.08);
}
html[data-theme="light"] .entry{
  background:var(--panel);
  box-shadow:var(--shadow-card);
}
html[data-theme="light"] .entry:hover{background:var(--panel)}
html[data-theme="light"] .btn-outline{
  background:#fff;
  border-color:var(--line-2);
}
html[data-theme="light"] .btn-outline:hover{background:var(--panel-2)}
html[data-theme="light"] .hero-tag{background:#fff}
html[data-theme="light"] .callout{background:#fff}
html[data-theme="light"] .callout.neutral{background:var(--panel-2)}
html[data-theme="light"] .code{background:#0e1728;border-color:rgba(16,42,80,.14)}
html[data-theme="light"] .code pre{color:#c7d6ea}
html[data-theme="light"] .tbl th{background:var(--panel-2)}
html[data-theme="light"] .tbl tr:hover td{background:var(--panel-2)}
html[data-theme="light"] .docs-nav{
  background:transparent;
}
html[data-theme="light"] .footer{border-top-color:var(--line)}


/* ---------- 主题切换按钮 ---------- */
.theme-toggle{
  width:34px;height:34px;border-radius:9px;flex-shrink:0;margin-left:10px;
  border:1px solid var(--line-2);background:var(--overlay);
  color:var(--muted);display:grid;place-items:center;cursor:pointer;
  padding:0;transition:color .15s,border-color .15s,background .15s;
}
.theme-toggle:hover{color:var(--text);border-color:var(--dim);background:var(--overlay-2)}
.theme-toggle svg{display:block}
.theme-toggle .ico-moon{display:none}
html[data-theme="light"] .theme-toggle .ico-sun{display:none}
html[data-theme="light"] .theme-toggle .ico-moon{display:block}

/* ---------- hero ---------- */
.hero{padding:calc(var(--nav-h) + 76px) 0 72px;position:relative;overflow:hidden}
.hero::before{
  content:"";position:absolute;top:-340px;left:50%;transform:translateX(-50%);
  width:900px;height:680px;pointer-events:none;
  background:radial-gradient(ellipse at 50% 50%,rgba(59,158,255,.13),transparent 62%);
  filter:blur(20px);
}
.hero-inner{position:relative;max-width:760px}
.hero-tag{
  display:inline-flex;align-items:center;gap:9px;
  font-size:12px;color:var(--muted);letter-spacing:.06em;
  padding:4px 12px 4px 5px;border-radius:100px;
  border:1px solid var(--line-2);background:rgba(255,255,255,.025);
  margin-top:30px;
}
.hero-tag b{
  background:var(--accent);color:#04121f;font-size:10px;font-weight:800;
  padding:2px 8px;border-radius:100px;letter-spacing:.05em;
}
.hero h1{
  font-size:clamp(36px,5.8vw,60px);font-weight:700;letter-spacing:-.032em;
  line-height:1.1;margin-bottom:20px;
}
.hero h1 em{font-style:normal;color:var(--accent)}
.hero-sub{color:var(--muted);font-size:clamp(15px,1.7vw,17px);max-width:60ch;margin-bottom:32px}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px}

/* ---------- cards ---------- */
.grid{display:grid;gap:14px}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}

.card{
  padding:22px;border-radius:var(--radius);
  border:1px solid var(--line);
  background:linear-gradient(180deg,rgba(255,255,255,.026),rgba(255,255,255,.005));
  transition:border-color .22s,transform .22s var(--ease),background .22s;
}
.card:hover{border-color:var(--line-2);transform:translateY(-2px);background:linear-gradient(180deg,rgba(255,255,255,.042),rgba(255,255,255,.008))}
.card h3{font-size:15.5px;margin:0 0 7px}
.card p{color:var(--muted);font-size:13.8px;line-height:1.7;margin:0}
.card .num{
  display:inline-grid;place-items:center;width:26px;height:26px;border-radius:7px;
  background:var(--accent-soft);border:1px solid var(--accent-line);
  color:var(--accent);font-size:12px;font-weight:700;margin-bottom:12px;
}

/* feature card with icon */
.fcard .ico{
  width:32px;height:32px;border-radius:8px;display:grid;place-items:center;
  background:var(--accent-soft);border:1px solid var(--accent-line);
  color:var(--accent);margin-bottom:13px;
}

/* ---------- entry cards (home) ---------- */
.entries{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.entry{
  display:flex;flex-direction:column;padding:26px;border-radius:var(--radius);
  border:1px solid var(--line);background:var(--bg-2);
  transition:border-color .2s,transform .2s var(--ease),background .2s;
}
.entry:hover{border-color:var(--accent-line);transform:translateY(-2px);background:var(--panel)}
.entry h3{font-size:17px;margin-bottom:8px}
.entry p{color:var(--muted);font-size:13.8px;margin-bottom:18px;flex:1}
.entry .go{color:var(--accent);font-size:13.5px;font-weight:600;display:inline-flex;align-items:center;gap:6px}

/* ---------- table ---------- */
.tbl{width:100%;border-collapse:collapse;font-size:14px}
.tbl th{
  text-align:left;font-size:11px;letter-spacing:.12em;text-transform:uppercase;
  color:var(--dim);font-weight:600;padding:0 14px 11px;border-bottom:1px solid var(--line);
}
.tbl td{padding:13px 14px;border-bottom:1px solid var(--line);color:var(--muted);vertical-align:top}
.tbl td:first-child{color:var(--text);font-weight:540;white-space:nowrap}
.tbl tr:last-child td{border-bottom:0}

/* ---------- callout ---------- */
.callout{
  display:flex;gap:12px;padding:15px 17px;border-radius:9px;
  background:var(--accent-soft);border:1px solid var(--accent-line);
  font-size:13.5px;color:#a6c2e6;line-height:1.72;
}
.callout b{color:var(--accent)}
.callout.neutral{background:rgba(255,255,255,.03);border-color:var(--line);color:var(--muted)}
.callout.neutral b{color:var(--text)}

/* ---------- docs layout ---------- */
.docs{display:grid;grid-template-columns:232px 1fr;gap:52px;align-items:start}
.docs-nav{position:sticky;top:calc(var(--nav-h) + 28px)}
.docs-nav h4{
  font-size:10.5px;letter-spacing:.14em;text-transform:uppercase;
  color:var(--dim);margin-bottom:10px;font-weight:600;
}
.docs-nav a{
  display:block;font-size:13.5px;color:var(--muted);padding:5px 0 5px 12px;
  border-left:2px solid transparent;transition:color .16s,border-color .16s;
}
.docs-nav a:hover{color:var(--text)}
.docs-nav a.on{color:var(--accent);border-left-color:var(--accent)}
.docs-body{min-width:0}
.docs-body > section{padding-bottom:44px;margin-bottom:44px;border-bottom:1px solid var(--line)}
.docs-body > section:last-child{border-bottom:0;margin-bottom:0;padding-bottom:0}
.docs-body h2{
  font-size:24px;margin-bottom:16px;scroll-margin-top:calc(var(--nav-h) + 24px);
}
.docs-body h3{font-size:16.5px;margin:26px 0 9px;color:var(--text)}
.docs-body p{color:var(--muted);margin-bottom:13px}
.docs-body ul,.docs-body ol{margin:0 0 14px;padding-left:20px;color:var(--muted)}
.docs-body li{margin-bottom:6px}
.docs-body li::marker{color:var(--dim)}

/* ---------- code ---------- */
.code{
  border-radius:9px;border:1px solid var(--line);background:#08090c;
  overflow:hidden;margin:14px 0;font-size:12.8px;
}
.code-h{
  padding:8px 13px;border-bottom:1px solid var(--line);
  font-size:11px;color:var(--dim);letter-spacing:.06em;
  font-family:ui-monospace,monospace;
}
.code pre{
  margin:0;padding:14px 15px;overflow-x:auto;line-height:1.72;
  color:#c3cbd8;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}
.code .c{color:#586374}
.code .s{color:#6fc3ff}
.code .n{color:#7dd3a0}

/* ---------- download ---------- */
.dl-card{
  display:flex;flex-wrap:wrap;align-items:center;gap:24px;
  padding:28px;border-radius:var(--radius);
  border:1px solid var(--line-2);
  background:linear-gradient(135deg,rgba(59,158,255,.09),rgba(255,255,255,.015));
}
.dl-card .meta{flex:1;min-width:220px}
.dl-card h2{font-size:21px;margin-bottom:6px}
.dl-card .sub{color:var(--muted);font-size:13.5px}
.dl-card .sub span{color:var(--dim)}
.dl-card .acts{display:flex;flex-wrap:wrap;gap:10px}

.badge{
  display:inline-flex;align-items:center;gap:6px;
  font-size:11.5px;padding:3px 9px;border-radius:5px;
  background:rgba(74,222,128,.10);border:1px solid rgba(74,222,128,.25);
  color:var(--ok);font-weight:600;letter-spacing:.02em;
}
.badge.gray{background:rgba(255,255,255,.04);border-color:var(--line);color:var(--dim)}

/* ---------- contact ---------- */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.contact-item{
  display:flex;gap:14px;padding:20px;border-radius:var(--radius);
  border:1px solid var(--line);background:var(--bg-2);
}
.contact-item .ico{
  width:34px;height:34px;border-radius:8px;flex-shrink:0;display:grid;place-items:center;
  background:var(--accent-soft);border:1px solid var(--accent-line);color:var(--accent);
}
.contact-item h3{font-size:14.5px;margin-bottom:3px}
.contact-item p{color:var(--muted);font-size:13.5px;margin:0}
.contact-item a{color:var(--accent)}

.form{display:flex;flex-direction:column;gap:14px;max-width:520px}
.field label{display:block;font-size:13px;color:var(--muted);margin-bottom:6px}
.field input,.field textarea{
  width:100%;padding:10px 12px;border-radius:8px;
  background:var(--panel);border:1px solid var(--line);
  color:var(--text);font-size:14px;font-family:inherit;
  transition:border-color .16s,background .16s;
}
.field input:focus,.field textarea:focus{
  outline:none;border-color:var(--accent-line);background:var(--panel-2);
}
.field textarea{resize:vertical;min-height:110px}

/* ---------- footer ---------- */
.footer{
  border-top:1px solid var(--line);margin-top:72px;padding:44px 0 34px;
  position:relative;z-index:1;
}
.foot-in{display:flex;justify-content:space-between;gap:40px;flex-wrap:wrap;margin-bottom:32px}
.foot-brand{max-width:320px}
.foot-brand p{color:var(--dim);font-size:13px;margin-top:10px;line-height:1.72}
.foot-cols{display:flex;gap:56px;flex-wrap:wrap}
.foot-col h4{font-size:11px;letter-spacing:.13em;text-transform:uppercase;color:var(--dim);margin-bottom:10px;font-weight:600}
.foot-col a{display:block;font-size:13px;color:var(--muted);padding:3.5px 0;transition:color .16s}
.foot-col a:hover{color:var(--text)}
.foot-bot{
  display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;
  padding-top:20px;border-top:1px solid var(--line);
  font-size:12px;color:var(--dim);
}

/* ---------- responsive ---------- */
@media (max-width:980px){
  .g4{grid-template-columns:repeat(2,1fr)}
  .g3{grid-template-columns:repeat(2,1fr)}
  .entries{grid-template-columns:1fr}
  .docs{grid-template-columns:1fr;gap:28px}
  .docs-nav{position:static;display:flex;flex-wrap:wrap;gap:6px}
  .docs-nav h4{width:100%}
  .docs-nav a{border-left:0;border-bottom:2px solid transparent;padding:5px 8px}
  .docs-nav a.on{border-left:0;border-bottom-color:var(--accent)}
  .contact-grid{grid-template-columns:1fr}
}
@media (max-width:720px){
  :root{--nav-h:58px}
  .nav-links{
    position:fixed;top:var(--nav-h);left:0;right:0;
    flex-direction:column;align-items:stretch;gap:2px;
    padding:12px 20px 18px;
    background:rgba(10,11,14,.97);backdrop-filter:blur(18px);
    border-bottom:1px solid var(--line);
    transform:translateY(-120%);opacity:0;pointer-events:none;
    transition:transform .28s var(--ease),opacity .22s;
  }
  .nav-links.open{transform:none;opacity:1;pointer-events:auto}
  .nav-links a{padding:11px 12px;font-size:15px}
  .nav-gh{margin-left:0;justify-content:center}
  .burger{display:block}
  .g2,.g3,.g4{grid-template-columns:1fr}
  .hero{padding:calc(var(--nav-h) + 52px) 0 52px}
  .page-head{padding:calc(var(--nav-h) + 40px) 0 32px}
  .section{padding:48px 0}
  .dl-card{padding:22px}
  .foot-cols{gap:32px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *{transition-duration:.001ms!important;animation-duration:.001ms!important}
}