:root{--bg:#0b0f17;--panel:#111827;--line:#1f2937;--fg:#e5e7eb;--sub:#9ca3af;--acc:#4f8cff}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--fg);font:15px/1.65 -apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,"PingFang SC","Microsoft YaHei",sans-serif}
a{color:var(--acc);text-decoration:none}a:hover{text-decoration:underline}
.wrap{max-width:960px;margin:0 auto;padding:0 20px}
header{border-bottom:1px solid var(--line);background:rgba(11,15,23,.9);position:sticky;top:0;backdrop-filter:blur(8px)}
.nav{display:flex;align-items:center;gap:22px;height:60px}
.brand{font-weight:700;font-size:17px;letter-spacing:.3px;color:#fff}
.nav a{color:var(--sub);font-size:14px}.nav a:hover{color:#fff;text-decoration:none}
.hero{padding:70px 0 40px;text-align:center}
h1{font-size:36px;line-height:1.25;margin:0 0 14px}
.sub{color:var(--sub);font-size:16px;max-width:640px;margin:0 auto 26px}
.btn{display:inline-block;padding:11px 22px;border-radius:10px;background:var(--acc);color:#fff;font-weight:600}
.btn.ghost{background:transparent;border:1px solid var(--line);color:var(--fg)}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px;margin:36px 0}
.card{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:18px}
.card h3{margin:0 0 8px;font-size:15px}
.card p{margin:0;color:var(--sub);font-size:13.5px}
footer{border-top:1px solid var(--line);color:var(--sub);font-size:13px;padding:22px 0;margin-top:50px}
code,pre{background:#0d1420;border:1px solid var(--line);border-radius:8px}
code{padding:2px 6px;font-size:13px}pre{padding:14px;overflow:auto;font-size:13px}
h2{font-size:22px;margin:34px 0 10px}
ul{color:var(--sub)}

/* ================= 科技感增强 2026-10-28 ================= */
body{
  background:
    radial-gradient(900px 500px at 15% -10%, rgba(56,189,248,.18), transparent 60%),
    radial-gradient(800px 500px at 90% 0%, rgba(139,92,246,.16), transparent 60%),
    radial-gradient(700px 500px at 50% 110%, rgba(34,211,238,.10), transparent 60%),
    #070b12 !important;
  position:relative;
}
body::before{
  content:"";position:fixed;inset:0;pointer-events:none;z-index:0;
  background-image:linear-gradient(rgba(120,160,255,.055) 1px, transparent 1px),
                   linear-gradient(90deg, rgba(120,160,255,.055) 1px, transparent 1px);
  background-size:44px 44px;
  mask-image:radial-gradient(circle at 50% 20%, #000 0%, transparent 78%);
}
header{background:rgba(7,11,18,.72)!important;border-bottom:1px solid rgba(120,160,255,.14)!important;box-shadow:0 1px 0 rgba(255,255,255,.03), 0 10px 40px rgba(0,0,0,.45)}
.brand{background:linear-gradient(120deg,#67e8f9,#818cf8 55%,#c084fc);-webkit-background-clip:text;background-clip:text;color:transparent!important}
.wrap{position:relative;z-index:1}
h1{background:linear-gradient(120deg,#e6f3ff 10%,#9fd8ff 45%,#a78bfa 90%);-webkit-background-clip:text;background-clip:text;color:transparent;letter-spacing:.5px}
h2{letter-spacing:.4px;color:#dbe7ff}
.card{
  background:linear-gradient(160deg, rgba(20,30,48,.86), rgba(11,17,28,.92))!important;
  border:1px solid rgba(120,160,255,.16)!important;
  box-shadow:0 10px 30px rgba(0,0,0,.35), inset 0 1px 0 rgba(255,255,255,.05);
  transition:transform .22s ease, box-shadow .22s ease, border-color .22s ease;
  position:relative;overflow:hidden;
}
.card::after{
  content:"";position:absolute;inset:-1px;border-radius:inherit;pointer-events:none;
  background:linear-gradient(120deg, rgba(103,232,249,.24), transparent 35%, transparent 65%, rgba(167,139,250,.22));
  opacity:0;transition:opacity .25s ease;
}
.card:hover{transform:translateY(-3px);border-color:rgba(120,170,255,.38)!important;box-shadow:0 18px 46px rgba(0,0,0,.5), 0 0 0 1px rgba(120,170,255,.14), 0 0 30px rgba(56,189,248,.10)}
.card:hover::after{opacity:1}
.card h3{color:#e8f1ff;letter-spacing:.3px}
.btn{
  background:linear-gradient(120deg,#22d3ee,#3b82f6 55%,#8b5cf6)!important;
  box-shadow:0 8px 24px rgba(59,130,246,.35), inset 0 1px 0 rgba(255,255,255,.25);
  border:0;transition:transform .18s ease, box-shadow .18s ease, filter .18s ease;
}
.btn:hover{transform:translateY(-1px);filter:brightness(1.06);box-shadow:0 12px 30px rgba(59,130,246,.48);text-decoration:none}
.btn.ghost{background:rgba(120,160,255,.08)!important;border:1px solid rgba(120,160,255,.28)!important;color:#cfe0ff!important;box-shadow:none}
a{color:#67e8f9}
footer{border-top:1px solid rgba(120,160,255,.14)!important;color:#8fa3bf!important;background:rgba(6,10,16,.6)}
ul li{margin:6px 0}
code{background:rgba(120,160,255,.12);padding:2px 6px;border-radius:6px;color:#a5d8ff}

/* ================= 首屏入场动画 2026-10-28 ================= */
@keyframes zfadeUp{from{opacity:0;transform:translateY(18px)}to{opacity:1;transform:none}}
@keyframes zglow{0%,100%{filter:drop-shadow(0 0 0 rgba(56,189,248,0))}50%{filter:drop-shadow(0 0 14px rgba(56,189,248,.35))}}
.hero h1{animation:zfadeUp .65s cubic-bezier(.2,.7,.2,1) both, zglow 5s ease-in-out 1s infinite}
.hero .sub{animation:zfadeUp .65s cubic-bezier(.2,.7,.2,1) .12s both}
.hero .btn{animation:zfadeUp .65s cubic-bezier(.2,.7,.2,1) .22s both}
.grid .card{animation:zfadeUp .6s cubic-bezier(.2,.7,.2,1) both}
.grid .card:nth-child(1){animation-delay:.30s}
.grid .card:nth-child(2){animation-delay:.38s}
.grid .card:nth-child(3){animation-delay:.46s}
.grid .card:nth-child(4){animation-delay:.54s}
@media (prefers-reduced-motion: reduce){*{animation:none!important;transition:none!important}}

/* 主题切换按钮 */
.theme-toggle{margin-left:auto;width:34px;height:34px;border-radius:10px;cursor:pointer;
  background:rgba(120,160,255,.10);border:1px solid rgba(120,160,255,.26);color:#bfe6ff;font-size:15px;
  display:inline-flex;align-items:center;justify-content:center;transition:all .2s ease}
.theme-toggle:hover{background:rgba(120,160,255,.2);transform:translateY(-1px)}

/* ================= 亮色主题 2026-10-28 ================= */
html[data-theme="light"] body{
  background:
    radial-gradient(900px 500px at 12% -12%, rgba(56,189,248,.20), transparent 60%),
    radial-gradient(820px 520px at 92% 0%, rgba(139,92,246,.16), transparent 60%),
    #f6f8fc !important;
  color:#0f172a;
}
html[data-theme="light"] body::before{
  background-image:linear-gradient(rgba(30,64,175,.07) 1px, transparent 1px),
                   linear-gradient(90deg, rgba(30,64,175,.07) 1px, transparent 1px);
}
html[data-theme="light"] header{background:rgba(255,255,255,.75)!important;border-bottom:1px solid rgba(30,64,175,.12)!important;box-shadow:0 10px 30px rgba(15,23,42,.06)}
html[data-theme="light"] .brand{background:linear-gradient(120deg,#0891b2,#4f46e5 55%,#9333ea);-webkit-background-clip:text;background-clip:text;color:transparent!important}
html[data-theme="light"] .nav a{color:#475569}
html[data-theme="light"] .nav a:hover{color:#0f172a}
html[data-theme="light"] h1{background:linear-gradient(120deg,#0f172a 10%,#0e7490 55%,#6d28d9 95%);-webkit-background-clip:text;background-clip:text;color:transparent}
html[data-theme="light"] h2{color:#0f172a}
html[data-theme="light"] .sub{color:#475569}
html[data-theme="light"] .card{background:linear-gradient(160deg, rgba(255,255,255,.95), rgba(248,250,255,.92))!important;
  border:1px solid rgba(30,64,175,.12)!important;box-shadow:0 10px 26px rgba(15,23,42,.07), inset 0 1px 0 rgba(255,255,255,.9)}
html[data-theme="light"] .card:hover{border-color:rgba(79,70,229,.32)!important;box-shadow:0 18px 40px rgba(15,23,42,.12)}
html[data-theme="light"] .card h3{color:#0f172a}
html[data-theme="light"] .card p,html[data-theme="light"] ul li{color:#475569}
html[data-theme="light"] a{color:#0891b2}
html[data-theme="light"] footer{background:rgba(255,255,255,.6)!important;border-top:1px solid rgba(30,64,175,.12)!important;color:#64748b!important}
html[data-theme="light"] .btn.ghost{background:rgba(15,23,42,.05)!important;border:1px solid rgba(15,23,42,.14)!important;color:#0f172a!important}
html[data-theme="light"] .theme-toggle{background:rgba(15,23,42,.06);border-color:rgba(15,23,42,.14);color:#334155}
html[data-theme="light"] code{background:rgba(30,64,175,.08);color:#1d4ed8}

/* ================= 亮色主题修复 2026-10-28 ================= */
/* 按钮文字必须是白色（渐变底），否则亮色下变成深蓝看不清 */
html[data-theme="light"] .btn,
html[data-theme="light"] .btn:visited{color:#fff!important}
html[data-theme="light"] .btn.ghost{color:#0f172a!important}
/* 代码块：亮色下改浅底深字，并统一圆角内边距 */
pre{background:#0b1220;color:#dbe7ff;border:1px solid rgba(120,160,255,.18);border-radius:10px;padding:12px 14px;overflow:auto;font-size:13px;line-height:1.65}
html[data-theme="light"] pre{background:#f1f5fb!important;color:#1e293b!important;border:1px solid rgba(30,64,175,.14)!important;box-shadow:inset 0 1px 0 rgba(255,255,255,.8)}
html[data-theme="light"] pre code{background:transparent!important;color:inherit!important;padding:0}
/* 导航当前页：不要出现怪异底板 */
.nav a{position:relative;padding:5px 2px;border-radius:8px}
.nav a.active,.nav a[aria-current="page"]{color:inherit}
html[data-theme="light"] .nav a{color:#475569!important}
html[data-theme="light"] .nav a:hover{color:#0f172a!important;background:transparent!important}
html[data-theme="dark"] .nav a{color:#9fb0c8!important}
html[data-theme="dark"] .nav a:hover{color:#fff!important}
/* 主题按钮不要遮挡最后一个链接 */
.theme-toggle{flex:0 0 auto}
.nav{flex-wrap:nowrap}

/* ================= 页脚贴底 2026-10-28 ================= */
html,body{min-height:100%}
body{display:flex;flex-direction:column;min-height:100vh}
main{flex:1 0 auto}
footer{margin-top:auto!important;background:transparent!important;border-top:1px solid rgba(120,160,255,.10)!important;
  padding:18px 0 22px!important;color:#8fa3bf!important;font-size:13px}
html[data-theme="light"] footer{background:transparent!important;border-top:1px solid rgba(30,64,175,.10)!important;color:#64748b!important}
footer .wrap{display:flex;gap:16px;align-items:center;justify-content:center;flex-wrap:wrap}

/* ================= 移动端适配 2026-10-28 ================= */
@media (max-width: 900px){
  .wrap{padding:0 16px}
  .nav{height:auto;min-height:56px;flex-wrap:wrap;gap:12px;padding:10px 0}
  .nav a{font-size:13.5px;padding:4px 6px}
  .theme-toggle{width:32px;height:32px;margin-left:auto}
  .hero{padding:48px 0 24px}
  h1{font-size:27px;line-height:1.3;letter-spacing:.2px}
  .sub{font-size:14.5px;padding:0 4px;margin-bottom:20px}
  .hero .btn{margin:6px 0;width:100%;max-width:320px;display:inline-block}
  h2{font-size:20px;margin-top:26px}
  .grid{grid-template-columns:1fr;gap:12px;margin:22px 0}
  .card{padding:15px}
  .card h3{font-size:14.5px}
  .card p,.card li{font-size:13px}
  pre{font-size:12px;padding:10px 12px;white-space:pre;overflow-x:auto}
  ul{padding-left:18px}
  footer{padding:16px 0 18px!important}
  footer .wrap{flex-direction:column;gap:8px}
}
@media (max-width: 560px){
  h1{font-size:23px}
  .sub{font-size:13.5px}
  .nav{gap:8px}
  .nav a{font-size:12.5px}
  .hero .btn{max-width:none}
  .card{padding:13px;border-radius:12px}
  .brand{font-size:16px}
}
/* 移动端点击区域更友好 */
@media (hover: none){
  .card:hover{transform:none}
  .btn{padding:12px 20px}
}
/* 防止横向溢出 */
html,body{overflow-x:hidden}
pre,code,table{max-width:100%}
img{max-width:100%;height:auto}

/* ================= 移动端二次修正 2026-10-28 ================= */
@media (max-width: 900px){
  /* 导航：一行横向滚动，不要每个字换行 */
  .nav{flex-wrap:nowrap!important;overflow-x:auto;overflow-y:hidden;gap:14px!important;padding:12px 0!important;
       -webkit-overflow-scrolling:touch;scrollbar-width:none}
  .nav::-webkit-scrollbar{display:none}
  .nav a{white-space:nowrap!important;flex:0 0 auto;font-size:14px!important}
  .brand{flex:0 0 auto;margin-right:6px}
  .theme-toggle{flex:0 0 auto;margin-left:auto}

  /* 按钮：统一整行宽度、居中、竖排 */
  .hero{display:flex;flex-direction:column;align-items:center;gap:10px;padding:40px 0 20px}
  .hero h1{margin-bottom:6px}
  .hero .sub{margin-bottom:6px}
  .hero .btn{width:100%!important;max-width:420px!important;display:block!important;
             text-align:center;padding:13px 18px!important;margin:0!important;box-sizing:border-box}
}
@media (max-width: 560px){
  .nav a{font-size:13px!important}
  .hero h1{font-size:24px}
  .hero .sub{font-size:13.5px;line-height:1.65}
  .hero .btn{max-width:none!important;font-size:14px}
}