/* ============================================================
   星云 Nebula · IDC 服务器官网主题（拟态 + 实时模糊版）
   适用于 魔方财务IDC系统 官网模板
   ============================================================
   设计语言：
   - 深色拟态（Dark Neumorphism）：同色系底 + 亮/暗双层阴影制造凹凸
   - 玻璃拟态（Glassmorphism）：半透明卡片 + backdrop-filter 实时模糊
   - 亮/暗主题通过 <body> 上的 light-theme / dark-theme 类切换
   换肤：修改 --brand-1 / --brand-2 / --accent 三个变量即可
   ============================================================ */

:root{
  /* 品牌色（渐变） */
  --brand-1:#22d3ee;
  --brand-2:#818cf8;
  --accent:#5b8cff;
  --accent-soft:rgba(91,140,255,.12);
  --gradient:linear-gradient(120deg,var(--brand-1),var(--brand-2));

  /* 暗色拟态默认值 */
  --bg:#0d1220;
  --bg-2:#111827;
  --surface:rgba(17,25,40,.52);
  --surface-2:#182136;
  --border:rgba(148,163,184,.14);
  --text:#e8effc;
  --text-2:#9fb0cc;
  --text-3:#66748f;

  /* 拟态阴影（暗色 · 轻量版） */
  --n-out:5px 5px 12px rgba(2,6,14,.28),-5px -5px 12px rgba(147,168,205,.045);
  --n-out-sm:3px 3px 7px rgba(2,6,14,.24),-3px -3px 7px rgba(147,168,205,.04);
  --n-in:inset 4px 4px 9px rgba(2,6,14,.26),inset -4px -4px 9px rgba(147,168,205,.05);
  --n-in-sm:inset 2px 2px 6px rgba(2,6,14,.22),inset -2px -2px 6px rgba(147,168,205,.045);
  --glow:0 20px 60px -30px rgba(34,211,238,.16);

  --radius:18px;
  --radius-sm:12px;
  --font:'Inter','PingFang SC','Microsoft YaHei',system-ui,-apple-system,sans-serif;
  --mono:'JetBrains Mono','SF Mono',Consolas,monospace;
  --nav-h:66px;
}

/* 亮色拟态 */
body.light-theme{
  --bg:#e9eef6;
  --bg-2:#f3f6fb;
  --surface:rgba(255,255,255,.62);
  --surface-2:#dfe6f1;
  --border:rgba(100,116,139,.14);
  --text:#1a2333;
  --text-2:#54617a;
  --text-3:#8b97ad;

  --n-out:5px 5px 12px rgba(164,176,196,.34),-5px -5px 12px #ffffff;
  --n-out-sm:3px 3px 7px rgba(170,182,202,.30),-3px -3px 7px #ffffff;
  --n-in:inset 4px 4px 9px rgba(164,176,196,.32),inset -4px -4px 9px #ffffff;
  --n-in-sm:inset 2px 2px 6px rgba(170,182,202,.28),inset -2px -2px 6px #ffffff;
  --glow:0 20px 55px -32px rgba(91,140,255,.30);
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:var(--font);
  background:var(--bg);
  background-image:
    radial-gradient(1100px 520px at 85% -10%,rgba(34,211,238,.08),transparent 60%),
    radial-gradient(900px 480px at -10% 30%,rgba(129,140,248,.10),transparent 60%),
    radial-gradient(800px 500px at 50% 115%,rgba(91,140,255,.07),transparent 60%);
  background-attachment:fixed;
  color:var(--text);
  line-height:1.7;
  font-size:15px;
  -webkit-font-smoothing:antialiased;
  transition:background .3s ease,color .3s ease;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
ul{list-style:none}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}

.container{width:min(1200px,92%);margin:0 auto}
.container-fluid{width:100%;padding:0 4%}

/* ---------- 背景装饰 ---------- */
.bg-grid{
  position:relative;
  background-image:
    linear-gradient(rgba(148,163,184,.05) 1px,transparent 1px),
    linear-gradient(90deg,rgba(148,163,184,.05) 1px,transparent 1px);
  background-size:44px 44px;
}
.light-theme .bg-grid{background-image:linear-gradient(rgba(15,23,42,.035) 1px,transparent 1px),linear-gradient(90deg,rgba(15,23,42,.035) 1px,transparent 1px)}
.hero-glow{
  position:absolute;border-radius:50%;filter:blur(90px);pointer-events:none;z-index:0;
}
.hero-glow.g1{width:520px;height:520px;background:radial-gradient(circle,rgba(34,211,238,.28),transparent 65%);top:-180px;right:-80px}
.hero-glow.g2{width:420px;height:420px;background:radial-gradient(circle,rgba(129,140,248,.26),transparent 65%);bottom:-160px;left:-100px}

/* ---------- 通用组件（拟态） ---------- */
.gradient-text{
  background:var(--gradient);
  -webkit-background-clip:text;
  background-clip:text;
  -webkit-text-fill-color:transparent;
  color:transparent;
}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 26px;border-radius:999px;font-weight:600;font-size:14px;
  transition:transform .18s ease,box-shadow .18s ease,background .18s ease,color .18s ease;
  white-space:nowrap;
  background:var(--surface-2);
  box-shadow:var(--n-out);
  border:1px solid transparent;
  -webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);
}
.btn:active{transform:scale(.97);box-shadow:var(--n-in)}
.btn-primary{
  background:var(--gradient);color:#fff;border:none;
  box-shadow:0 10px 30px -12px rgba(91,140,255,.40),var(--n-out-sm);
}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 14px 38px -14px rgba(34,211,238,.34),var(--n-out-sm)}
.btn-primary:active{transform:scale(.97);box-shadow:var(--n-in-sm)}
.btn-ghost{color:var(--text)}
.btn-ghost:hover{color:var(--brand-1);box-shadow:var(--n-in-sm)}
.btn-lg{padding:15px 34px;font-size:15px}
.btn-sm{padding:9px 20px;font-size:13px}

.section{padding:88px 0}
.section-head{text-align:center;max-width:640px;margin:0 auto 52px}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;font-size:12px;font-weight:600;
  letter-spacing:.14em;text-transform:uppercase;color:var(--brand-1);
  background:var(--surface);border:1px solid var(--border);
  padding:6px 16px;border-radius:999px;margin-bottom:16px;
  box-shadow:var(--n-out-sm);
  -webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);
}
.section-title{font-size:clamp(26px,3.4vw,40px);font-weight:800;letter-spacing:-.02em;line-height:1.2}
.section-sub{margin-top:14px;color:var(--text-2);font-size:16px}

/* ---------- 公告条 ---------- */
.notice-bar{
  background:linear-gradient(90deg,rgba(14,165,233,.92),rgba(99,102,241,.92));
  color:#fff;font-size:13.5px;
  position:relative;z-index:60;
  -webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);
}
.notice-bar .inner{display:flex;align-items:center;justify-content:center;gap:12px;padding:9px 44px;text-align:center}
.notice-bar .action-btn{
  background:rgba(255,255,255,.18);border:1px solid rgba(255,255,255,.35);
  padding:3px 14px;border-radius:999px;font-weight:600;font-size:12.5px;flex-shrink:0;
}
.notice-bar .action-btn:hover{background:rgba(255,255,255,.28)}
.notice-bar .close-btn{
  position:absolute;right:14px;top:50%;transform:translateY(-50%);
  width:28px;height:28px;display:flex;align-items:center;justify-content:center;
  border-radius:8px;color:#fff;font-size:16px;
}
.notice-bar .close-btn:hover{background:rgba(255,255,255,.18)}
.notice-bar.hidden{display:none}

/* ---------- 导航（毛玻璃） ---------- */
.navbar{
  position:sticky;top:0;z-index:50;
  background:color-mix(in srgb,var(--bg) 62%,transparent);
  -webkit-backdrop-filter:blur(22px) saturate(1.4);backdrop-filter:blur(22px) saturate(1.4);
  border-bottom:1px solid var(--border);
}
.nav-inner{display:flex;align-items:center;gap:28px;height:var(--nav-h)}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:19px;letter-spacing:-.01em;flex-shrink:0}
.brand img{height:34px;width:auto}
.nav-links{display:flex;align-items:center;gap:4px;margin-left:auto}
.nav-links .link{position:relative;padding:8px 14px;border-radius:10px;font-size:14.5px;font-weight:500;color:var(--text-2);transition:color .2s}
.nav-links .link:hover,.nav-links .link.active{color:var(--text)}
.nav-links .link.active::after{
  content:'';position:absolute;left:14px;right:14px;bottom:2px;height:2px;
  background:var(--gradient);border-radius:2px;
}
.dropdown{position:relative}
.dropdown-menu{
  position:absolute;top:calc(100% + 12px);left:0;min-width:230px;
  background:color-mix(in srgb,var(--bg-2) 82%,transparent);
  -webkit-backdrop-filter:blur(24px);backdrop-filter:blur(24px);
  border:1px solid var(--border);border-radius:var(--radius);
  box-shadow:var(--n-out),0 24px 60px -20px rgba(0,0,0,.5);
  padding:10px;opacity:0;visibility:hidden;transform:translateY(8px);
  transition:all .22s ease;z-index:80;
}
.dropdown:hover .dropdown-menu{opacity:1;visibility:visible;transform:translateY(0)}
.dropdown-menu .group-title{font-size:11.5px;font-weight:700;letter-spacing:.08em;color:var(--text-3);text-transform:uppercase;padding:10px 12px 4px}
.dropdown-menu a.dm-link{display:block;padding:9px 12px;border-radius:8px;font-size:14px;color:var(--text-2)}
.dropdown-menu a.dm-link:hover{background:var(--accent-soft);color:var(--brand-1)}
.nav-actions{display:flex;align-items:center;gap:10px}
.nav-actions .icon-btn{
  width:38px;height:38px;border-radius:11px;display:flex;align-items:center;justify-content:center;
  background:var(--surface-2);box-shadow:var(--n-out-sm);
  border:1px solid transparent;color:var(--text-2);transition:all .2s;
}
.nav-actions .icon-btn:active{box-shadow:var(--n-in-sm)}
.nav-actions .icon-btn:hover{color:var(--brand-1)}
.nav-actions .username{max-width:110px;overflow:hidden;text-overflow:ellipsis}
.menu-btn{display:none}

/* 移动端菜单（全屏毛玻璃） */
.mobile-menu{
  position:fixed;inset:0;z-index:90;display:none;flex-direction:column;padding:24px 6%;
  background:color-mix(in srgb,var(--bg) 78%,transparent);
  -webkit-backdrop-filter:blur(26px) saturate(1.3);backdrop-filter:blur(26px) saturate(1.3);
}
.mobile-menu.open{display:flex}
.mobile-menu .m-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:26px}
.mobile-menu .m-link{display:block;padding:15px 4px;font-size:17px;font-weight:600;border-bottom:1px solid var(--border)}
.mobile-menu .m-link small{display:block;font-size:12.5px;font-weight:400;color:var(--text-3);margin-top:2px}
.mobile-menu .m-actions{margin-top:24px;display:flex;gap:12px}
.mobile-menu .m-actions .btn{flex:1}

/* ---------- Hero ---------- */
.hero{position:relative;overflow:hidden;padding:90px 0 100px}
.hero .container{position:relative;z-index:1}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:56px;align-items:center}
.hero-badge{
  display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:600;color:var(--brand-1);
  background:var(--surface);border:1px solid var(--border);
  padding:7px 16px;border-radius:999px;margin-bottom:22px;
  box-shadow:var(--n-out-sm);
  -webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);
}
.hero-badge .dot{width:7px;height:7px;border-radius:50%;background:#34d399;box-shadow:0 0 0 4px rgba(52,211,153,.2);animation:pulse 2s infinite}
@keyframes pulse{0%,100%{box-shadow:0 0 0 3px rgba(52,211,153,.18)}50%{box-shadow:0 0 0 7px rgba(52,211,153,.05)}}
.hero-title{font-size:clamp(34px,5vw,58px);font-weight:800;line-height:1.12;letter-spacing:-.03em}
.hero-title .gradient-text{display:inline-block}
.hero-sub{margin:20px 0 30px;font-size:17px;color:var(--text-2);max-width:520px}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap}
.hero-stats{
  display:flex;gap:26px;margin-top:48px;padding-top:30px;
  border-top:1px solid var(--border);flex-wrap:wrap;
}
.hero-stat{min-width:118px}
.hero-stat .num{font-family:var(--mono);font-size:26px;font-weight:700;color:var(--text)}
.hero-stat .num .gradient-text{font-size:26px}
.hero-stat .label{font-size:12.5px;color:var(--text-3);margin-top:2px}

/* Hero 右侧登录卡（玻璃拟态 + 内嵌底） */
.auth-card{
  position:relative;border-radius:22px;padding:34px 30px;
  background:var(--surface);
  -webkit-backdrop-filter:blur(20px) saturate(1.35);backdrop-filter:blur(20px) saturate(1.35);
  border:1px solid var(--border);
  box-shadow:var(--n-out),var(--glow);
}
.auth-card::before{
  content:'';position:absolute;inset:-1px;border-radius:22px;padding:1px;
  background:linear-gradient(135deg,rgba(34,211,238,.45),transparent 40%,transparent 60%,rgba(129,140,248,.45));
  -webkit-mask:linear-gradient(#fff 0 0) content-box,linear-gradient(#fff 0 0);
  -webkit-mask-composite:xor;mask-composite:exclude;
  pointer-events:none;
}
.auth-card .a-title{font-size:22px;font-weight:800;margin-bottom:4px}
.auth-card .a-sub{font-size:13.5px;color:var(--text-2);margin-bottom:24px}
.auth-card .a-form{display:flex;flex-direction:column;gap:13px}
.auth-card .field{position:relative}
.auth-card .field svg{position:absolute;left:15px;top:50%;transform:translateY(-50%);width:17px;height:17px;color:var(--text-3)}
.auth-card input[type="text"],.auth-card input[type="password"]{
  width:100%;padding:13px 14px 13px 44px;border-radius:12px;font-size:14px;
  background:color-mix(in srgb,var(--bg) 66%,transparent);
  border:1px solid var(--border);color:var(--text);outline:none;
  box-shadow:var(--n-in-sm);transition:border .2s;
}
.auth-card input:focus{border-color:var(--brand-1);box-shadow:var(--n-in-sm),0 0 0 3px var(--accent-soft)}
.auth-card .btn{width:100%;margin-top:4px}
.auth-card .a-links{display:flex;justify-content:space-between;font-size:13px;margin-top:14px;color:var(--text-2)}
.auth-card .a-links a:hover{color:var(--brand-1)}
.auth-card .a-note{margin-top:18px;padding-top:16px;border-top:1px dashed var(--border);font-size:12.5px;color:var(--text-3);text-align:center}
.auth-card .a-note a{color:var(--brand-1)}

/* ---------- 品牌承诺条（拟态卡片） ---------- */
.trust-strip{padding:26px 0;border-top:1px solid var(--border);border-bottom:1px solid var(--border)}
.trust-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.trust-item{
  display:flex;align-items:center;gap:14px;padding:16px 18px;border-radius:var(--radius-sm);
  background:var(--surface);border:1px solid var(--border);
  box-shadow:var(--n-out-sm);
  -webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);
}
.trust-item .t-icon{
  width:44px;height:44px;border-radius:12px;flex-shrink:0;
  display:flex;align-items:center;justify-content:center;color:var(--brand-1);
  background:var(--surface-2);box-shadow:var(--n-in-sm);
}
.trust-item .t-text strong{display:block;font-size:14.5px}
.trust-item .t-text span{font-size:12.5px;color:var(--text-3)}

/* ---------- 产品套餐（拟态卡片，用于产品子页） ---------- */
.plans-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.plan-card{
  position:relative;padding:28px 24px;border-radius:var(--radius);
  display:flex;flex-direction:column;
  background:var(--surface);border:1px solid var(--border);
  box-shadow:var(--n-out);
  -webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);
  transition:transform .25s ease,box-shadow .25s ease,border-color .25s ease;
}
.plan-card:hover{transform:translateY(-6px);box-shadow:var(--n-out),var(--glow);border-color:rgba(129,140,248,.4)}
.plan-card.popular{border-color:rgba(34,211,238,.45);box-shadow:var(--n-out),var(--glow)}
.plan-card.popular::before{
  content:'最受欢迎';position:absolute;top:-13px;left:50%;transform:translateX(-50%);
  background:var(--gradient);color:#fff;font-size:11.5px;font-weight:700;
  padding:4px 16px;border-radius:999px;letter-spacing:.05em;white-space:nowrap;
  box-shadow:var(--n-out-sm);
}
.plan-name{font-size:18px;font-weight:700}
.plan-desc{font-size:13px;color:var(--text-2);margin-top:4px;min-height:38px}
.plan-price{display:flex;align-items:baseline;gap:6px;margin:20px 0 4px}
.plan-price .cur{font-size:16px;font-weight:600;color:var(--text-2)}
.plan-price .num{font-family:var(--mono);font-size:42px;font-weight:800;background:var(--gradient);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.plan-price .unit{font-size:13px;color:var(--text-3)}
.plan-loc{font-size:12.5px;color:var(--text-3);margin-bottom:18px}
.plan-feats{display:flex;flex-direction:column;gap:9px;margin:18px 0 22px;flex:1}
.plan-feats li{display:flex;align-items:flex-start;gap:9px;font-size:13.5px;color:var(--text-2)}
.plan-feats svg{width:16px;height:16px;color:#34d399;flex-shrink:0;margin-top:3px}
.plan-card .btn{width:100%}

/* ---------- 特性卡片（拟态） ---------- */
.features-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.feature-card{
  padding:26px 22px;border-radius:var(--radius);position:relative;overflow:hidden;
  background:var(--surface);border:1px solid var(--border);
  box-shadow:var(--n-out);
  -webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);
  transition:all .25s ease;
}
.feature-card::after{
  content:'';position:absolute;left:0;top:0;width:100%;height:2px;
  background:var(--gradient);transform:scaleX(0);transform-origin:left;transition:transform .3s ease;
}
.feature-card:hover{transform:translateY(-4px);box-shadow:var(--n-in)}
.feature-card:hover::after{transform:scaleX(1)}
.feature-card .f-icon{
  width:48px;height:48px;border-radius:13px;margin-bottom:16px;
  display:flex;align-items:center;justify-content:center;color:var(--brand-1);
  background:var(--surface-2);box-shadow:var(--n-in-sm);
}
.feature-card h3{font-size:16.5px;font-weight:700;margin-bottom:8px}
.feature-card p{font-size:13.5px;color:var(--text-2)}

/* ---------- 系统支持（Linux / Windows 大卡） ---------- */
.os-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:22px;max-width:880px;margin:0 auto}
.os-item{
  position:relative;overflow:hidden;padding:34px 30px;border-radius:var(--radius);
  display:flex;align-items:center;gap:22px;text-align:left;
  background:var(--surface);border:1px solid var(--border);
  box-shadow:var(--n-out);
  -webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);
  transition:all .25s ease;
}
.os-item::after{
  content:'';position:absolute;right:-60px;top:-60px;width:180px;height:180px;border-radius:50%;
  background:radial-gradient(circle,rgba(34,211,238,.14),transparent 65%);
  pointer-events:none;
}
.os-item:hover{transform:translateY(-5px);box-shadow:var(--n-out),var(--glow)}
.os-item .os-icon{
  width:64px;height:64px;border-radius:18px;flex-shrink:0;
  display:flex;align-items:center;justify-content:center;color:var(--brand-1);
  font-family:var(--mono);font-weight:800;font-size:15px;letter-spacing:.02em;
  background:var(--surface-2);box-shadow:var(--n-in);
}
.os-item .os-body{flex:1}
.os-item .os-body strong{display:block;font-size:19px;font-weight:700}
.os-item .os-body span{font-size:13.5px;color:var(--text-2);display:block;margin-top:6px;line-height:1.6}
.os-item .os-body .os-tags{margin-top:10px;display:flex;gap:8px;flex-wrap:wrap}
.os-item .os-body .os-tags i{
  font-style:normal;font-size:11.5px;color:var(--text-3);padding:3px 10px;border-radius:999px;
  background:var(--surface-2);box-shadow:var(--n-in-sm);
}

/* ---------- 数据中心节点 ---------- */
.nodes{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}
.node-card{
  display:flex;gap:18px;align-items:flex-start;padding:24px;border-radius:var(--radius);
  background:var(--surface);border:1px solid var(--border);
  box-shadow:var(--n-out);
  -webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);
}
.node-card .n-icon{
  width:50px;height:50px;border-radius:14px;flex-shrink:0;
  display:flex;align-items:center;justify-content:center;color:#fff;
  background:var(--gradient);box-shadow:var(--n-out-sm);
}
.node-card h3{font-size:17px;font-weight:700}
.node-card .n-meta{display:flex;gap:16px;margin-top:8px;flex-wrap:wrap}
.node-card .n-meta span{font-size:12.5px;color:var(--text-3);display:flex;align-items:center;gap:5px}
.node-card .n-meta svg{width:13px;height:13px;color:var(--brand-1)}

/* ---------- 统计条（拟态数字卡） ---------- */
.stats-band{border-top:1px solid var(--border);border-bottom:1px solid var(--border)}
.stats-band .inner{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;padding:48px 0}
.stat-cell{
  text-align:center;padding:26px 14px;border-radius:var(--radius);
  background:var(--surface);border:1px solid var(--border);
  box-shadow:var(--n-out-sm);
  -webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);
}
.stat-cell .num{font-family:var(--mono);font-size:38px;font-weight:800;background:var(--gradient);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.stat-cell .label{font-size:13.5px;color:var(--text-2);margin-top:4px}

/* ---------- CTA 横幅 ---------- */
.cta-band{
  position:relative;overflow:hidden;border-radius:24px;
  background:linear-gradient(120deg,rgba(14,165,233,.92),rgba(99,102,241,.92));
  padding:54px 48px;text-align:center;color:#fff;
  box-shadow:var(--n-out),var(--glow);
}
.cta-band::before{
  content:'';position:absolute;inset:0;opacity:.16;
  background-image:radial-gradient(#fff 1px,transparent 1px);background-size:22px 22px;
}
.cta-band h2{position:relative;font-size:clamp(24px,3vw,34px);font-weight:800;letter-spacing:-.02em}
.cta-band p{position:relative;margin:12px 0 26px;opacity:.92;font-size:15.5px}
.cta-band .btn{position:relative;background:#fff;color:#0f172a;box-shadow:0 10px 30px -12px rgba(0,0,0,.35)}
.cta-band .btn:hover{transform:translateY(-2px)}

/* ---------- 页脚 ---------- */
.footer{background:color-mix(in srgb,var(--bg-2) 70%,transparent);-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);border-top:1px solid var(--border);margin-top:20px}
.footer-top{padding:60px 0 40px}
.footer-grid{display:grid;grid-template-columns:1.6fr repeat(4,1fr);gap:34px}
.footer-brand p{font-size:13.5px;color:var(--text-2);margin:16px 0 20px;max-width:280px}
.footer-col h4{font-size:14px;font-weight:700;margin-bottom:16px;letter-spacing:.04em}
.footer-col ul li{margin-bottom:10px}
.footer-col a{font-size:13.5px;color:var(--text-2);transition:color .2s}
.footer-col a:hover{color:var(--brand-1)}
.footer-bottom{border-top:1px solid var(--border);padding:22px 0}
.footer-bottom .inner{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:13px;color:var(--text-3)}
.footer-bottom a:hover{color:var(--brand-1)}
.footer-bottom .links{display:flex;gap:20px}

/* ---------- 子页面 Hero ---------- */
.page-hero{position:relative;overflow:hidden;padding:64px 0 72px;border-bottom:1px solid var(--border)}
.page-hero .container{position:relative;z-index:1}
.page-hero .crumb{display:flex;gap:8px;font-size:13px;color:var(--text-3);margin-bottom:20px;flex-wrap:wrap}
.page-hero .crumb a:hover{color:var(--brand-1)}
.page-hero .crumb .sep{color:var(--text-3)}
.page-hero h1{font-size:clamp(28px,4vw,44px);font-weight:800;letter-spacing:-.02em;line-height:1.15}
.page-hero p{margin-top:14px;color:var(--text-2);font-size:16px;max-width:640px}

/* ---------- 表格（对比页） ---------- */
.spec-table{width:100%;border-collapse:collapse;border-radius:var(--radius);overflow:hidden}
.spec-table th,.spec-table td{padding:14px 18px;text-align:left;font-size:14px;border-bottom:1px solid var(--border)}
.spec-table th{background:var(--surface-2);font-weight:600;color:var(--text);font-size:13px;letter-spacing:.03em}
.spec-table td{color:var(--text-2);background:var(--surface)}
.spec-table tr:last-child td{border-bottom:none}
.spec-table .feature-td{font-weight:600;color:var(--text)}
.spec-table .ok{color:#34d399;font-weight:600}

/* ---------- 关于页 ---------- */
.value-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.value-card{padding:30px 26px;border-radius:var(--radius);text-align:center;
  background:var(--surface);border:1px solid var(--border);
  box-shadow:var(--n-out);
  -webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);
}
.value-card .v-icon{
  width:56px;height:56px;margin:0 auto 18px;border-radius:16px;
  display:flex;align-items:center;justify-content:center;color:#fff;
  background:var(--gradient);box-shadow:var(--n-out-sm);
}
.value-card h3{font-size:17px;font-weight:700;margin-bottom:10px}
.value-card p{font-size:14px;color:var(--text-2)}
.about-text{font-size:16px;color:var(--text-2);line-height:2;max-width:820px;margin:0 auto;text-align:center}

/* ---------- 响应式 ---------- */
@media (max-width:1080px){
  .plans-grid{grid-template-columns:repeat(2,1fr)}
  .features-grid{grid-template-columns:repeat(2,1fr)}
  .hero-grid{grid-template-columns:1fr;gap:44px}
  .auth-card{max-width:460px}
  .trust-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:repeat(2,1fr)}
  .nodes{grid-template-columns:1fr}
}
@media (max-width:768px){
  .nav-links{display:none}
  .menu-btn{display:flex}
  .nav-actions .hide-sm{display:none}
  .plans-grid,.features-grid,.value-grid,.stats-band .inner{grid-template-columns:1fr}
  .trust-grid{grid-template-columns:1fr}
  .os-grid{grid-template-columns:1fr}
  .section{padding:64px 0}
  .hero{padding:56px 0 72px}
  .hero-stats{gap:22px;display:grid;grid-template-columns:1fr 1fr;row-gap:26px}
  .footer-grid{grid-template-columns:1fr;gap:26px}
  .notice-bar .inner{font-size:12.5px;padding:9px 38px}
}

/* ---------- 主题设置 ---------- */
.theme-settings-btn{
  position:fixed;right:22px;bottom:26px;z-index:70;
  width:48px;height:48px;border-radius:50%;display:flex;align-items:center;justify-content:center;
  background:var(--surface-2);border:1px solid var(--border);color:var(--text-2);
  box-shadow:var(--n-out);transition:all .2s;
  -webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);
}
.theme-settings-btn:hover{color:var(--brand-1);transform:rotate(30deg)}
.theme-settings-btn svg{width:20px;height:20px}
.theme-settings{
  position:fixed;right:22px;bottom:84px;z-index:71;width:230px;
  background:color-mix(in srgb,var(--bg-2) 84%,transparent);
  -webkit-backdrop-filter:blur(24px);backdrop-filter:blur(24px);
  border:1px solid var(--border);border-radius:18px;
  box-shadow:var(--n-out),0 30px 70px -20px rgba(0,0,0,.6);padding:20px;
  opacity:0;visibility:hidden;transform:translateY(10px);transition:all .22s ease;
}
.theme-settings.open{opacity:1;visibility:visible;transform:translateY(0)}
.theme-settings .t-title{font-size:14px;font-weight:700;margin-bottom:14px}
.theme-settings .t-row{display:flex;align-items:center;justify-content:space-between;padding:9px 0;font-size:13.5px;color:var(--text-2);border-top:1px dashed var(--border)}
.theme-settings .themes{display:flex;gap:8px;margin-bottom:12px}
.theme-settings .theme-btn{flex:1;text-align:center;font-size:12.5px;padding:8px 6px;border-radius:9px;border:1px solid var(--border);color:var(--text-2);transition:all .2s}
.theme-settings .theme-btn.active{background:var(--accent-soft);border-color:var(--brand-1);color:var(--brand-1);font-weight:600}
.theme-settings .copy{font-size:11.5px;color:var(--text-3);margin-top:12px;padding-top:12px;border-top:1px solid var(--border)}