/* ==========================================================================
   爱加速官网 — 网络连接加速工具
   赛博朋克机械风：深黑底 + 霓虹青/品红 + 切角几何 + 霓虹发光 + 网格 HUD
   ========================================================================== */

:root {
  --bg: #05050a;
  --bg-2: #0a0a14;
  --panel: #0e0e1a;
  --panel-2: #131324;
  --border: #1e2a3a;
  --cyan: #00e0ff;
  --magenta: #ff2ec4;
  --green: #00ff88;
  --amber: #ffc400;
  --text: #e6f1ff;
  --muted: #8a9bb5;
  --title: #ffffff;
  --radius: 4px;
  --maxw: 1160px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg); color: var(--text); font-size: 16px; line-height: 1.7;
  position: relative;
}
/* 网格背景 */
body::before {
  content: ""; position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background-image:
    linear-gradient(rgba(0,224,255,.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,224,255,.05) 1px, transparent 1px);
  background-size: 40px 40px;
}
/* 扫描线 */
body::after {
  content: ""; position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background: repeating-linear-gradient(0deg, rgba(0,0,0,.12) 0px, rgba(0,0,0,.12) 1px, transparent 1px, transparent 3px);
  opacity: .4;
}
a { color: var(--cyan); text-decoration: none; transition: all .2s; }
a:hover { color: var(--magenta); text-shadow: 0 0 8px var(--magenta); }
img { max-width: 100%; height: auto; display: block; }
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; position: relative; z-index: 1; }

/* ---------- 导航 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: #171722; backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.nav { display: flex; align-items: center; gap: 24px; height: 64px; }
.logo { display: flex; align-items: center; gap: 10px; font-size: 20px; font-weight: 800; color: var(--title); letter-spacing: 1px; }
.logo img, .f-logo img { flex: none; }
.logo em { font-style: normal; color: var(--cyan); text-shadow: 0 0 12px var(--cyan); }
.nav-links { display: flex; gap: 4px; }
.nav-links a {
  padding: 7px 14px; border-radius: 2px; color: var(--muted); font-size: 14px;
  font-weight: 500; letter-spacing: 1px; position: relative;
}
.nav-links a::before { content: ">"; color: var(--cyan); margin-right: 4px; opacity: 0; transition: opacity .2s; }
.nav-links a:hover { color: var(--cyan); }
.nav-links a:hover::before { opacity: 1; }
.nav-links a.active { color: var(--cyan); text-shadow: 0 0 10px var(--cyan); }
.nav-actions { margin-left: auto; display: flex; align-items: center; gap: 12px; }
.nav-login { color: var(--muted); font-size: 14px; }

/* ---------- 切角按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 26px; font-size: 15px; font-weight: 700; letter-spacing: 1px;
  cursor: pointer; border: 1px solid transparent; transition: all .2s; white-space: nowrap;
  clip-path: polygon(10px 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%, 0 10px);
}
.btn-primary {
  background: linear-gradient(135deg, var(--cyan), #0080ff); color: #001016;
  box-shadow: 0 0 20px rgba(0,224,255,.4);
}
.btn-primary:hover { box-shadow: 0 0 32px rgba(0,224,255,.7); transform: translateY(-1px); color: #001016; }
.btn-outline {
  background: transparent; color: var(--cyan); border: 1px solid var(--cyan);
  box-shadow: inset 0 0 12px rgba(0,224,255,.15);
}
.btn-outline:hover { background: rgba(0,224,255,.1); color: var(--cyan); text-shadow: 0 0 10px var(--cyan); }
.btn-magenta {
  background: linear-gradient(135deg, var(--magenta), #ff0080); color: #1a0010;
  box-shadow: 0 0 20px rgba(255,46,196,.4);
}
.btn-magenta:hover { box-shadow: 0 0 32px rgba(255,46,196,.7); color: #1a0010; }
.btn-lg { padding: 15px 34px; font-size: 16px; }
.btn-block { width: 100%; }

/* ---------- Hero ---------- */
.hero { padding: 72px 0 60px; position: relative; z-index: 1; }
.hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 48px; align-items: center; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px; padding: 6px 14px;
  background: rgba(0,224,255,.08); border: 1px solid var(--cyan); border-radius: 2px;
  color: var(--cyan); font-size: 13px; font-weight: 600; letter-spacing: 1px;
  clip-path: polygon(6px 0, 100% 0, 100% calc(100% - 6px), calc(100% - 6px) 100%, 0 100%, 0 6px);
  margin-bottom: 20px;
}
.hero h1 { font-size: 44px; line-height: 1.2; font-weight: 900; letter-spacing: 1px; color: var(--title); }
.hero h1 .hl { color: var(--cyan); text-shadow: 0 0 18px var(--cyan); }
.hero .sub { margin-top: 18px; font-size: 17px; color: var(--muted); max-width: 520px; }
.hero-cta { display: flex; gap: 14px; margin-top: 32px; flex-wrap: wrap; }
.hero-note { margin-top: 18px; font-size: 13px; color: var(--muted); display: flex; gap: 18px; flex-wrap: wrap; }
.hero-note span::before { content: "▸"; color: var(--cyan); margin-right: 6px; }

/* HUD 数据面板 */
.hud-panel {
  background: var(--panel); border: 1px solid var(--border); border-radius: 4px;
  padding: 24px; position: relative;
  clip-path: polygon(16px 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%, 0 16px);
}
.hud-panel::before {
  content: ""; position: absolute; top: -1px; left: -1px; width: 40px; height: 40px;
  border-top: 2px solid var(--cyan); border-left: 2px solid var(--cyan);
}
.hud-panel::after {
  content: ""; position: absolute; bottom: -1px; right: -1px; width: 40px; height: 40px;
  border-bottom: 2px solid var(--magenta); border-right: 2px solid var(--magenta);
}
.hud-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 18px; padding-bottom: 12px; border-bottom: 1px dashed var(--border); }
.hud-head b { font-size: 13px; color: var(--cyan); letter-spacing: 2px; font-family: "Consolas", monospace; }
.hud-head .dot { display: flex; gap: 6px; }
.hud-head .dot i { width: 9px; height: 9px; border-radius: 50%; display: block; }
.hud-head .dot i:nth-child(1){ background:#ff2ec4; }
.hud-head .dot i:nth-child(2){ background:#ffc400; }
.hud-head .dot i:nth-child(3){ background:#00ff88; }
.stat-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.stat-card { background: var(--panel-2); border: 1px solid var(--border); padding: 14px; border-radius: 2px; }
.stat-card .num { font-size: 26px; font-weight: 900; color: var(--cyan); line-height: 1.1; font-family: "Consolas", monospace; }
.stat-card .num small { font-size: 13px; color: var(--green); margin-left: 2px; }
.stat-card .lbl { font-size: 12px; color: var(--muted); margin-top: 6px; letter-spacing: 1px; }
.speed-row { margin-top: 16px; background: var(--panel-2); border: 1px solid var(--border); padding: 14px; border-radius: 2px; }
.speed-row .fname { font-size: 13px; color: var(--text); font-family: "Consolas", monospace; }
.speed-row .fmeta { font-size: 11px; color: var(--muted); margin-top: 4px; letter-spacing: 1px; }
.speed-bar { height: 8px; background: var(--border); border-radius: 2px; margin-top: 10px; overflow: hidden; }
.speed-bar i { display: block; height: 100%; background: linear-gradient(90deg, var(--cyan), var(--green)); box-shadow: 0 0 12px var(--cyan); }

/* ---------- 通用 section ---------- */
.section { padding: 60px 0; position: relative; z-index: 1; }
.section.alt { background: var(--bg-2); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.sec-head { text-align: center; max-width: 640px; margin: 0 auto 40px; }
.sec-head h2 { font-size: 30px; font-weight: 800; color: var(--title); letter-spacing: 2px; }
.sec-head h2::before { content: "// "; color: var(--cyan); }
.sec-head p { margin-top: 12px; color: var(--muted); font-size: 16px; }
.sec-head.left { text-align: left; margin-left: 0; }

/* ---------- 功能卡 ---------- */
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.feature-card {
  background: var(--panel); border: 1px solid var(--border); padding: 26px;
  transition: all .25s; position: relative; border-radius: 2px;
  clip-path: polygon(12px 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%, 0 12px);
}
.feature-card:hover { border-color: var(--cyan); box-shadow: 0 0 24px rgba(0,224,255,.25); transform: translateY(-3px); }
.feature-card .ic { width: 52px; height: 52px; display: flex; align-items: center; justify-content: center; background: rgba(0,224,255,.08); border: 1px solid var(--cyan); margin-bottom: 16px; }
.feature-card h3 { font-size: 18px; color: var(--title); margin-bottom: 8px; letter-spacing: 1px; }
.feature-card p { font-size: 14px; color: var(--muted); }

/* ---------- 下载矩阵 ---------- */
.dl-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.dl-card {
  background: var(--panel); border: 1px solid var(--border); padding: 26px; text-align: center;
  transition: all .25s; border-radius: 2px;
  clip-path: polygon(12px 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%, 0 12px);
}
.dl-card:hover { border-color: var(--magenta); box-shadow: 0 0 24px rgba(255,46,196,.25); transform: translateY(-3px); }
.dl-card .ic { width: 58px; height: 58px; margin: 0 auto 16px; display: flex; align-items: center; justify-content: center; background: rgba(0,224,255,.08); border: 1px solid var(--cyan); }
.dl-card h3 { font-size: 17px; color: var(--title); letter-spacing: 1px; }
.dl-card p { font-size: 13px; color: var(--muted); margin: 8px 0 16px; }
.dl-card .badge { display: inline-block; font-size: 11px; color: var(--green); background: rgba(0,255,136,.1); border: 1px solid var(--green); padding: 3px 10px; margin-bottom: 14px; letter-spacing: 1px; }

/* ---------- 步骤 ---------- */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.step { display: flex; gap: 16px; }
.step .idx {
  flex: none; width: 44px; height: 44px; background: var(--cyan); color: #001016;
  font-weight: 900; font-size: 18px; display: flex; align-items: center; justify-content: center;
  font-family: "Consolas", monospace;
  clip-path: polygon(6px 0, 100% 0, 100% calc(100% - 6px), calc(100% - 6px) 100%, 0 100%, 0 6px);
}
.step h3 { font-size: 17px; color: var(--title); letter-spacing: 1px; }
.step p { font-size: 14px; color: var(--muted); margin-top: 6px; }

/* ---------- 场景卡 ---------- */
.scene-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.scene-card {
  display: flex; gap: 16px; background: var(--panel); border: 1px solid var(--border);
  padding: 22px; align-items: flex-start; border-radius: 2px;
  clip-path: polygon(10px 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%, 0 10px);
}
.scene-card .ic { flex: none; width: 46px; height: 46px; display: flex; align-items: center; justify-content: center; background: rgba(255,46,196,.08); border: 1px solid var(--magenta); }
.scene-card h3 { font-size: 16px; color: var(--title); letter-spacing: 1px; }
.scene-card p { font-size: 13px; color: var(--muted); margin-top: 6px; }

/* ---------- 订阅套餐 ---------- */
.plan-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; align-items: stretch; }
.plan {
  background: var(--panel); border: 1px solid var(--border); padding: 28px;
  display: flex; flex-direction: column; position: relative; transition: all .25s; border-radius: 2px;
  clip-path: polygon(12px 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%, 0 12px);
}
.plan:hover { border-color: var(--cyan); box-shadow: 0 0 24px rgba(0,224,255,.25); }
.plan.hot { border: 1px solid var(--cyan); box-shadow: 0 0 28px rgba(0,224,255,.3); }
.plan .tag { position: absolute; top: -12px; left: 50%; transform: translateX(-50%); background: var(--cyan); color: #001016; font-size: 11px; font-weight: 800; padding: 3px 14px; letter-spacing: 1px; }
.plan h3 { font-size: 18px; color: var(--title); letter-spacing: 1px; }
.plan .price { margin: 16px 0 4px; font-size: 40px; font-weight: 900; color: var(--cyan); line-height: 1; font-family: "Consolas", monospace; }
.plan .price small { font-size: 14px; color: var(--muted); }
.plan .price-unit { font-size: 13px; color: var(--muted); }
.plan ul { list-style: none; margin: 22px 0 26px; flex: 1; }
.plan ul li { padding: 8px 0; font-size: 14px; color: var(--text); display: flex; gap: 9px; align-items: flex-start; }
.plan ul li::before { content: "▸"; color: var(--green); flex: none; }

/* ---------- FAQ ---------- */
.faq-list { max-width: 820px; margin: 0 auto; }
.faq-item { background: var(--panel); border: 1px solid var(--border); margin-bottom: 14px; overflow: hidden; border-radius: 2px; }
.faq-item details summary { padding: 18px 22px; cursor: pointer; font-weight: 600; color: var(--title); font-size: 16px; list-style: none; display: flex; justify-content: space-between; align-items: center; letter-spacing: 1px; }
.faq-item details summary::-webkit-details-marker { display: none; }
.faq-item details summary::after { content: "+"; font-size: 22px; color: var(--cyan); font-weight: 400; }
.faq-item details[open] summary::after { content: "−"; }
.faq-item details .faq-a { padding: 0 22px 20px; font-size: 15px; color: var(--muted); }

/* ---------- 正文 SEO 段 ---------- */
.seo-content { font-size: 15px; color: var(--muted); text-align: justify; }
.seo-content p { margin-bottom: 14px; text-indent: 2em; }
.seo-content h2, .seo-content h3 { text-indent: 0; color: var(--title); margin: 22px 0 12px; letter-spacing: 1px; }
.seo-content h2::before, .seo-content h3::before { content: "// "; color: var(--cyan); }
.seo-content strong { color: var(--cyan); }

/* ---------- 文章页 ---------- */
.article { max-width: 820px; margin: 0 auto; }
.article-meta { color: var(--muted); font-size: 13px; margin: 14px 0 26px; display: flex; gap: 16px; flex-wrap: wrap; }
.article h2 { font-size: 22px; color: var(--title); margin: 28px 0 12px; letter-spacing: 1px; }
.article h3 { font-size: 18px; color: var(--title); margin: 22px 0 10px; }
.article p { margin-bottom: 14px; text-align: justify; color: var(--muted); }
.article ul, .article ol { margin: 0 0 16px 22px; color: var(--muted); }
.article li { margin-bottom: 8px; }
.article strong { color: var(--cyan); }
.article .tip { background: rgba(0,224,255,.08); border-left: 3px solid var(--cyan); padding: 16px 18px; margin: 18px 0; }

/* ---------- 面包屑 ---------- */
.breadcrumb { font-size: 13px; color: var(--muted); padding: 18px 0 0; }
.breadcrumb a { color: var(--muted); }
.breadcrumb a:hover { color: var(--cyan); }
.breadcrumb span { margin: 0 6px; color: var(--border); }

/* ---------- 页脚 ---------- */
.site-footer { background: #171722; color: var(--muted); padding: 54px 0 0; margin-top: 40px; border-top: 1px solid var(--border); position: relative; z-index: 1; }
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 32px; }
.footer-col .f-logo { display: flex; align-items: center; gap: 8px; color: var(--title); font-size: 17px; font-weight: 700; margin-bottom: 14px; letter-spacing: 1px; }
.footer-col p { font-size: 13px; color: var(--muted); line-height: 1.8; }
.footer-col h4 { color: var(--cyan); font-size: 14px; margin-bottom: 16px; letter-spacing: 2px; }
.footer-col a { display: block; color: var(--muted); font-size: 13px; padding: 5px 0; }
.footer-col a:hover { color: var(--cyan); }
.footer-bottom { border-top: 1px solid var(--border); margin-top: 40px; padding: 20px 0; font-size: 12px; color: var(--muted); text-align: center; letter-spacing: 1px; }

/* ---------- 404 ---------- */
.error-404 { text-align: center; padding: 90px 0 70px; }
.error-404 .code { font-size: 100px; font-weight: 900; color: var(--cyan); line-height: 1; text-shadow: 0 0 30px var(--cyan); font-family: "Consolas", monospace; }
.error-404 h1 { font-size: 26px; color: var(--title); margin: 18px 0 10px; }
.error-404 p { color: var(--muted); margin-bottom: 28px; }

/* ---------- 响应式 ---------- */
@media (max-width: 768px) {
  .nav { gap: 14px; flex-wrap: wrap; height: auto; padding: 12px 0; }
  .nav-links { order: 3; width: 100%; overflow-x: auto; gap: 2px; }
  .nav-links a { white-space: nowrap; }
  .hero { padding: 40px 0; }
  .hero-grid { grid-template-columns: 1fr; gap: 34px; }
  .hero h1 { font-size: 30px; }
  .feature-grid, .dl-grid, .plan-grid, .steps { grid-template-columns: 1fr 1fr; }
  .scene-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .sec-head h2 { font-size: 24px; }
}
@media (max-width: 480px) {
  .feature-grid, .dl-grid, .plan-grid, .steps { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero h1 { font-size: 26px; }
  .hero-cta { flex-direction: column; }
  .hero-cta .btn { width: 100%; }
  body { font-size: 15px; }
  .stat-grid { grid-template-columns: 1fr; }
}