/* ========================================
   QuickQ v5 — 靛蓝→紫罗兰 极光主题
   Indigo-Violet Aurora Design System
   ======================================== */

:root {
  --bg: #070b14;
  --bg2: #0b1120;
  --bg3: #101828;
  --border: #1c2740;
  --border2: #2a3858;
  --text: #eef1f8;
  --text2: #9aa6c0;
  --text3: #5e6b8a;
  --blue: #3B82F6;
  --violet: #8B5CF6;
  --cyan: #22d3ee;
  --green: #34d399;
  --gradient: linear-gradient(135deg, #3B82F6, #8B5CF6);
  --glow: rgba(99,102,241,.35);
  --subtle: rgba(99,102,241,.08);
  --r: 12px;
  --r-lg: 20px;
  --r-xl: 28px;
  --full: 9999px;
  --shadow: 0 8px 32px rgba(0,0,0,.4);
  --shadow-lg: 0 16px 56px rgba(0,0,0,.5);
  --max-w: 1280px;
  --tr: .3s cubic-bezier(.4,0,.2,1);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }

body {
  font-family: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
  min-height: 100vh;
}
body::before {
  content: '';
  position: fixed; inset: 0;
  background-image:
    linear-gradient(rgba(99,102,241,.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(99,102,241,.02) 1px, transparent 1px);
  background-size: 64px 64px;
  pointer-events: none;
  z-index: 0;
}

/* ---- 极光光斑 ---- */
.aurora { position: fixed; inset: 0; pointer-events: none; overflow: hidden; z-index: 0; }
.a-orb { position: absolute; border-radius: 50%; filter: blur(130px); opacity: .16; animation: auroraFloat 22s ease-in-out infinite; }
.a-1 { width: 620px; height: 620px; background: var(--blue); top: -220px; right: -140px; }
.a-2 { width: 520px; height: 520px; background: var(--violet); bottom: -180px; left: -120px; animation-delay: -8s; }
.a-3 { width: 420px; height: 420px; background: var(--cyan); top: 45%; left: 55%; opacity: .08; animation-delay: -15s; }
@keyframes auroraFloat {
  0%, 100% { transform: translate(0,0) scale(1); }
  33% { transform: translate(45px,-35px) scale(1.1); }
  66% { transform: translate(-30px,25px) scale(.92); }
}

/* ---- 导航 ---- */
.header { position: fixed; top: 0; left: 0; right: 0; z-index: 100; height: 66px; padding: 0 24px; transition: all var(--tr); }
.header.scrolled {
  background: rgba(11,17,32,.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 4px 24px rgba(0,0,0,.3);
}
.header-inner { max-width: var(--max-w); margin: 0 auto; height: 100%; display: flex; align-items: center; justify-content: space-between; }
.logo { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--text); font-weight: 700; font-size: 20px; letter-spacing: -.02em; }
.logo-icon { width: 36px; height: 36px; flex-shrink: 0; }
.logo-icon svg { display: block; width: 100%; height: 100%; }
.nav { display: flex; align-items: center; gap: 6px; }
.nav-link { text-decoration: none; color: var(--text2); font-size: 14px; font-weight: 500; padding: 8px 14px; border-radius: var(--full); transition: all var(--tr); }
.nav-link:hover { color: var(--text); background: rgba(255,255,255,.06); }
.nav-link.active { color: #818cf8; background: var(--subtle); }
.btn-header {
  display: inline-flex; align-items: center; gap: 6px;
  background: var(--gradient); color: #fff; text-decoration: none;
  font-size: 13px; font-weight: 600; padding: 8px 18px; border-radius: var(--full);
  transition: all var(--tr); margin-left: 8px;
}
.btn-header:hover { box-shadow: 0 4px 20px var(--glow); transform: translateY(-1px); }
.menu-btn { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 6px; z-index: 101; }
.menu-btn span { display: block; width: 24px; height: 2px; background: var(--text); border-radius: 2px; transition: all var(--tr); }
.menu-btn.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-btn.open span:nth-child(2) { opacity: 0; }
.menu-btn.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---- 按钮 ---- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 14px 28px; border-radius: var(--r);
  font-size: 15px; font-weight: 600; text-decoration: none;
  cursor: pointer; transition: all var(--tr); border: none;
}
.btn-primary { background: var(--gradient); color: #fff; box-shadow: 0 4px 20px var(--glow); }
.btn-primary:hover { box-shadow: 0 8px 32px var(--glow); transform: translateY(-2px); }
.btn-outline { background: transparent; color: var(--text); border: 1px solid var(--border2); }
.btn-outline:hover { border-color: #818cf8; color: #818cf8; background: var(--subtle); }
.btn-lg { padding: 18px 36px; font-size: 17px; border-radius: var(--r-lg); }

/* ---- 通用 ---- */
.inner { max-width: var(--max-w); margin: 0 auto; padding: 0 24px; }
section { position: relative; z-index: 1; }
.sec-head { text-align: center; margin-bottom: 56px; }
.sec-tag {
  display: inline-block; font-size: 12px; font-weight: 600;
  text-transform: uppercase; letter-spacing: .1em;
  color: #818cf8; background: var(--subtle);
  padding: 6px 16px; border-radius: var(--full);
  margin-bottom: 18px; border: 1px solid rgba(99,102,241,.25);
}
.sec-head h2 { font-size: clamp(30px, 4.5vw, 44px); font-weight: 800; letter-spacing: -.02em; margin-bottom: 12px; }
.sec-head p { font-size: 16px; color: var(--text2); }
.gt { background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }

/* ---- 滚动动画（默认可见，JS 标记首屏以下内容延迟显示） ---- */
.reveal { opacity: 1; transform: translateY(0); }
.reveal.is-hidden { opacity: 0; transform: translateY(30px); transition: opacity .7s ease, transform .7s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ============ 首页 ============ */
.hero { position: relative; z-index: 1; padding: 140px 24px 0; min-height: 100vh; display: flex; flex-direction: column; justify-content: center; }
.hero > .hero-inner {
  max-width: var(--max-w); margin: 0 auto; width: 100%;
  display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center;
}
.hero-text { display: flex; flex-direction: column; gap: 22px; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 7px 18px; background: var(--subtle);
  border: 1px solid rgba(99,102,241,.3); border-radius: var(--full);
  font-size: 13px; font-weight: 500; color: #818cf8; width: fit-content;
}
.dot { width: 8px; height: 8px; border-radius: 50%; background: #818cf8; animation: dotPulse 2s ease infinite; }
@keyframes dotPulse {
  0%, 100% { opacity: 1; box-shadow: 0 0 0 0 var(--glow); }
  50% { opacity: .4; box-shadow: 0 0 0 10px transparent; }
}
.hero h1 { font-size: clamp(42px, 5.5vw, 64px); font-weight: 900; line-height: 1.12; letter-spacing: -.03em; }
.hero h1 em { font-style: normal; background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero-desc { font-size: 17px; color: var(--text2); line-height: 1.8; max-width: 480px; }
.hero-btns { display: flex; gap: 16px; flex-wrap: wrap; margin-top: 6px; }
.metrics { display: flex; gap: 40px; padding-top: 22px; border-top: 1px solid var(--border); }
.metric strong { font-size: 28px; font-weight: 800; background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.metric strong i { font-style: normal; font-size: 17px; }
.metric span { display: block; font-size: 13px; color: var(--text3); }

/* 速率面板 */
.hero-visual { position: relative; display: flex; justify-content: center; align-items: center; }
.orbit { position: absolute; border-radius: 50%; border: 1px solid rgba(99,102,241,.14); pointer-events: none; }
.o-1 { width: 480px; height: 480px; animation: spin 26s linear infinite; }
.o-2 { width: 600px; height: 600px; border-style: dashed; border-color: rgba(139,92,246,.1); animation: spin 42s linear infinite reverse; }
@keyframes spin { to { transform: rotate(360deg); } }
.speed-panel {
  position: relative; z-index: 2;
  width: 100%; max-width: 400px;
  background: rgba(16,24,40,.9);
  border: 1px solid var(--border2);
  border-radius: var(--r-xl);
  padding: 24px;
  box-shadow: var(--shadow-lg), 0 0 80px rgba(99,102,241,.14);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  animation: floatY 5s ease-in-out infinite;
}
@keyframes floatY { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }
.sp-head { display: flex; justify-content: space-between; align-items: center; padding-bottom: 16px; border-bottom: 1px solid var(--border); }
.sp-title { font-size: 14px; font-weight: 700; }
.sp-live { display: flex; align-items: center; gap: 6px; font-size: 11px; font-weight: 700; color: var(--green); letter-spacing: .08em; }
.sp-live i { width: 8px; height: 8px; border-radius: 50%; background: var(--green); animation: dotPulse 1.6s ease infinite; }
.sp-speed { display: flex; align-items: baseline; gap: 12px; padding: 20px 0 8px; }
.sp-num {
  font-size: 60px; font-weight: 900; line-height: 1; letter-spacing: -.03em;
  background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.sp-unit { font-size: 12px; color: var(--text3); line-height: 1.5; }
.sp-chart { display: flex; align-items: flex-end; gap: 5px; height: 72px; padding: 8px 0 16px; border-bottom: 1px solid var(--border); }
.sp-chart i {
  flex: 1; height: var(--h);
  background: var(--gradient); opacity: .75;
  border-radius: 3px 3px 0 0;
  animation: barGrow 1s ease both, barBreathe 3s ease-in-out infinite alternate;
}
@keyframes barGrow { from { height: 0; } }
@keyframes barBreathe { to { opacity: 1; } }
.sp-row { display: flex; justify-content: space-between; font-size: 13px; color: var(--text2); padding: 14px 0; }
.sp-ping { color: var(--green); font-weight: 700; }
.sp-btn {
  width: 100%; display: flex; align-items: center; justify-content: center; gap: 10px;
  padding: 15px; background: var(--gradient); color: #fff;
  border: none; border-radius: var(--r-lg);
  font-size: 16px; font-weight: 700; cursor: pointer;
  transition: all var(--tr); box-shadow: 0 8px 28px var(--glow);
}
.sp-btn:hover { transform: translateY(-2px); box-shadow: 0 12px 40px var(--glow); }

/* 浮动卡片 */
.f-card {
  position: absolute; z-index: 3;
  display: flex; align-items: center; gap: 12px;
  padding: 13px 17px;
  background: rgba(16,24,40,.92);
  border: 1px solid var(--border2);
  border-radius: var(--r);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: var(--shadow);
}
.f-1 { top: 4%; right: -14px; animation: floatY 4s ease-in-out infinite; }
.f-2 { bottom: 4%; left: -14px; animation: floatY 4.5s ease-in-out 1s infinite; }
.fc-badge { font-size: 22px; }
.f-card strong { display: block; font-size: 13px; line-height: 1.3; }
.f-card span { font-size: 11px; color: var(--text3); }

/* 平台条 */
.platform-bar {
  max-width: var(--max-w); margin: 56px auto 0;
  display: flex; align-items: center; justify-content: center; gap: 28px;
  padding: 18px 32px; width: fit-content;
  background: rgba(16,24,40,.6);
  border: 1px solid var(--border);
  border-radius: var(--full);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}
.pb-label { font-size: 13px; font-weight: 600; color: var(--text3); white-space: nowrap; }
.pb-items { display: flex; gap: 24px; flex-wrap: wrap; justify-content: center; }
.pb-item { font-size: 14px; font-weight: 500; color: var(--text2); transition: color var(--tr); }
.pb-item:hover { color: #818cf8; }

/* 功能 */
.features { padding: 110px 0 0; }
.feat-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.feat {
  position: relative;
  background: rgba(16,24,40,.5);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 30px 26px;
  transition: all var(--tr);
  overflow: hidden;
}
.feat::after { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px; background: var(--gradient); opacity: 0; transition: opacity var(--tr); }
.feat:hover { background: rgba(16,24,40,.85); border-color: rgba(99,102,241,.4); transform: translateY(-4px); box-shadow: var(--shadow); }
.feat:hover::after { opacity: 1; }
.fnum { position: absolute; top: 22px; right: 22px; font-size: 30px; font-weight: 900; color: rgba(255,255,255,.04); line-height: 1; }
.fico {
  width: 50px; height: 50px; border-radius: var(--r);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 18px; transition: box-shadow var(--tr);
}
.fico svg { width: 25px; height: 25px; }
.f1 { background: rgba(59,130,246,.12); color: var(--blue); border: 1px solid rgba(59,130,246,.3); }
.f2 { background: rgba(139,92,246,.12); color: var(--violet); border: 1px solid rgba(139,92,246,.3); }
.f3 { background: rgba(34,211,238,.1); color: var(--cyan); border: 1px solid rgba(34,211,238,.25); }
.f4 { background: rgba(52,211,153,.1); color: var(--green); border: 1px solid rgba(52,211,153,.25); }
.f5 { background: rgba(245,158,11,.1); color: #f59e0b; border: 1px solid rgba(245,158,11,.25); }
.f6 { background: rgba(236,72,153,.1); color: #ec4899; border: 1px solid rgba(236,72,153,.25); }
.feat:hover .f1 { box-shadow: 0 0 24px rgba(59,130,246,.3); }
.feat h3 { font-size: 17px; font-weight: 700; margin-bottom: 8px; }
.feat p { font-size: 14px; color: var(--text2); line-height: 1.7; }

/* 节点 */
.nodes { padding: 100px 0 0; }
.node-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.node {
  text-align: center; padding: 30px 22px;
  background: rgba(16,24,40,.5);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  transition: all var(--tr);
}
.node:hover { border-color: rgba(99,102,241,.4); background: rgba(16,24,40,.85); transform: translateY(-4px); box-shadow: var(--shadow); }
.n-flag { font-size: 34px; margin-bottom: 8px; }
.node h4 { font-size: 16px; font-weight: 700; margin-bottom: 6px; }
.n-ping {
  display: inline-block; font-size: 13px; font-weight: 700;
  color: var(--green); background: rgba(52,211,153,.1);
  padding: 3px 12px; border-radius: var(--full); margin-bottom: 14px;
}
.n-bar { height: 5px; background: rgba(255,255,255,.06); border-radius: 3px; overflow: hidden; }
.n-bar i { display: block; height: 100%; width: var(--w, 80%); background: var(--gradient); border-radius: 3px; }

/* 套餐 */
.pricing { padding: 100px 0 0; }
.price-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; align-items: stretch; }
.price {
  position: relative;
  background: rgba(16,24,40,.5);
  border: 1px solid var(--border);
  border-radius: var(--r-xl);
  padding: 38px 30px;
  text-align: center;
  display: flex; flex-direction: column;
  transition: all var(--tr);
}
.price:hover { border-color: rgba(99,102,241,.4); transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.price.featured {
  background: linear-gradient(180deg, rgba(99,102,241,.1), rgba(139,92,246,.04));
  border-color: rgba(99,102,241,.45);
  box-shadow: 0 0 60px rgba(99,102,241,.12);
}
.p-tag {
  position: absolute; top: -13px; left: 50%; transform: translateX(-50%);
  font-size: 12px; font-weight: 700; color: #fff;
  background: var(--gradient); padding: 5px 18px;
  border-radius: var(--full); white-space: nowrap;
}
.p-badge {
  display: inline-block; font-size: 12px; font-weight: 700;
  color: var(--text2); background: rgba(255,255,255,.05);
  padding: 5px 16px; border-radius: var(--full);
  margin-bottom: 20px; align-self: center;
}
.price.featured .p-badge { background: var(--gradient); color: #fff; }
.p-price { font-size: 52px; font-weight: 900; letter-spacing: -.03em; line-height: 1.1; margin-bottom: 26px; }
.p-price span { font-size: 16px; font-weight: 500; color: var(--text3); letter-spacing: 0; }
.price.featured .p-price { background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.price.featured .p-price span { -webkit-text-fill-color: var(--text3); }
.price ul { list-style: none; text-align: left; margin-bottom: 30px; flex: 1; }
.price li { font-size: 14px; color: var(--text2); padding: 7px 0 7px 26px; position: relative; }
.price li::before {
  content: ''; position: absolute; left: 0; top: 13px;
  width: 16px; height: 16px; border-radius: 50%;
  background: var(--subtle); border: 1px solid rgba(99,102,241,.4);
}
.price li::after {
  content: ''; position: absolute; left: 4.5px; top: 17.5px;
  width: 7px; height: 4px;
  border-left: 1.5px solid #818cf8; border-bottom: 1.5px solid #818cf8;
  transform: rotate(-45deg);
}
.p-btn { width: 100%; }

/* CTA */
.cta { padding: 110px 0; }
.cta-card {
  padding: 64px 48px; text-align: center;
  background: linear-gradient(135deg, rgba(59,130,246,.1), rgba(139,92,246,.06));
  border: 1px solid rgba(99,102,241,.3);
  border-radius: var(--r-xl);
  position: relative; overflow: hidden;
}
.cta-card::before {
  content: ''; position: absolute; top: -50%; left: 50%;
  transform: translateX(-50%); width: 560px; height: 560px;
  background: radial-gradient(circle, rgba(99,102,241,.18), transparent 70%);
  pointer-events: none;
}
.cta-card h2 { font-size: clamp(26px, 3.5vw, 36px); font-weight: 800; margin-bottom: 12px; position: relative; }
.cta-card p { font-size: 15px; color: var(--text2); margin-bottom: 32px; position: relative; }
.cta-card .btn { position: relative; }

/* 页脚 */
.footer { border-top: 1px solid var(--border); background: var(--bg2); padding: 52px 0 0; position: relative; z-index: 1; }
.foot-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; padding-bottom: 40px; }
.foot-brand { display: flex; align-items: flex-start; gap: 12px; }
.foot-name { font-size: 17px; font-weight: 700; }
.foot-tag { font-size: 12px; color: var(--text3); }
.foot-col h5 { font-size: 13px; font-weight: 700; text-transform: uppercase; letter-spacing: .08em; margin-bottom: 14px; }
.foot-col a { display: block; color: var(--text2); font-size: 14px; text-decoration: none; padding: 4px 0; transition: color var(--tr); }
.foot-col a:hover { color: #818cf8; }
.foot-copy { border-top: 1px solid var(--border); padding: 22px 24px; text-align: center; font-size: 13px; color: var(--text3); }

/* 回到顶部 */
.scroll-top {
  position: fixed; bottom: 32px; right: 32px; z-index: 90;
  width: 44px; height: 44px; border-radius: 50%;
  background: var(--bg3); color: var(--text);
  border: 1px solid var(--border2); cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  opacity: 0; transform: translateY(20px);
  transition: all var(--tr); pointer-events: none;
}
.scroll-top.visible { opacity: 1; transform: translateY(0); pointer-events: auto; }
.scroll-top:hover { background: var(--blue); border-color: var(--blue); }

/* ============ 下载页 ============ */
.dl-page { position: relative; z-index: 1; padding: 140px 0 100px; }
.dl-head { text-align: center; margin-bottom: 60px; }
.dl-ring { position: relative; width: 108px; height: 108px; margin: 0 auto 28px; }
.dl-ring > svg { width: 100%; height: 100%; animation: spin 8s linear infinite; }
.dl-core { position: absolute; inset: 18px; display: flex; align-items: center; justify-content: center; }
.dl-core svg { width: 100%; height: 100%; filter: drop-shadow(0 0 24px rgba(99,102,241,.45)); }
.dl-head h1 { font-size: clamp(32px, 5vw, 46px); font-weight: 800; letter-spacing: -.03em; margin-bottom: 10px; }
.dl-head p { font-size: 16px; color: var(--text2); }
.dl-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; margin-bottom: 72px; }
.dl-card {
  position: relative;
  background: rgba(16,24,40,.5);
  border: 1px solid var(--border);
  border-radius: var(--r-xl);
  padding: 34px 30px;
  text-align: center;
  transition: all var(--tr);
}
.dl-card:hover { border-color: rgba(99,102,241,.4); background: rgba(16,24,40,.85); transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.dl-card.featured {
  background: linear-gradient(180deg, rgba(99,102,241,.09), rgba(139,92,246,.03));
  border-color: rgba(99,102,241,.45);
  box-shadow: 0 0 60px rgba(99,102,241,.1);
}
.dl-tag {
  position: absolute; top: 18px; right: 18px;
  font-size: 11px; font-weight: 700;
  background: var(--gradient); color: #fff;
  padding: 4px 14px; border-radius: var(--full);
}
.dl-icon {
  width: 62px; height: 62px; margin: 0 auto 16px;
  border-radius: var(--r-lg);
  background: var(--subtle);
  border: 1px solid rgba(99,102,241,.3);
  display: flex; align-items: center; justify-content: center;
  color: #818cf8; transition: all var(--tr);
}
.dl-card:hover .dl-icon { box-shadow: 0 0 28px rgba(99,102,241,.3); }
.dl-card h3 { font-size: 20px; font-weight: 800; margin-bottom: 4px; }
.dl-ver { font-size: 13px; color: var(--text3); display: block; margin-bottom: 18px; }
.dl-specs {
  text-align: left;
  background: rgba(255,255,255,.02);
  border: 1px solid var(--border);
  border-radius: var(--r);
  padding: 12px 18px; margin-bottom: 18px;
}
.ds { display: flex; justify-content: space-between; font-size: 13px; padding: 5px 0; }
.ds span { color: var(--text3); }
.ds strong { font-weight: 600; color: var(--text2); }
.dl-btn { width: 100%; margin-bottom: 12px; }
.dl-hash { display: block; font-size: 11px; color: var(--text3); word-break: break-all; line-height: 1.5; }

.guide { margin-bottom: 56px; }
.guide-row { display: flex; align-items: stretch; justify-content: center; gap: 18px; }
.gstep {
  flex: 1; max-width: 300px; text-align: center;
  padding: 30px 22px;
  background: rgba(16,24,40,.5);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  transition: all var(--tr);
}
.gstep:hover { border-color: rgba(99,102,241,.4); transform: translateY(-4px); box-shadow: var(--shadow); }
.gnum {
  font-size: 34px; font-weight: 900; line-height: 1.1; margin-bottom: 10px;
  background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.gstep h4 { font-size: 16px; font-weight: 700; margin-bottom: 8px; }
.gstep p { font-size: 13px; color: var(--text2); line-height: 1.7; }
.garr { display: flex; align-items: center; color: var(--text3); font-size: 20px; flex-shrink: 0; }
.back-link { display: inline-flex; align-items: center; gap: 8px; font-size: 14px; color: var(--text2); text-decoration: none; transition: color var(--tr); }
.back-link:hover { color: #818cf8; }

/* ============ 404 页 ============ */
.err-page {
  position: relative; z-index: 1;
  min-height: 100vh;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  text-align: center; padding: 130px 24px 80px;
}
.err-visual { position: relative; width: 150px; height: 150px; margin-bottom: 24px; }
.err-ring { position: absolute; border-radius: 50%; border: 1.5px solid; animation: ringPulse 2.4s ease-in-out infinite; }
.r-1 { inset: 0; border-color: rgba(99,102,241,.3); }
.r-2 { inset: -14px; border-style: dashed; border-color: rgba(139,92,246,.2); animation-delay: .5s; }
@keyframes ringPulse { 0%, 100% { transform: scale(.92); opacity: .5; } 50% { transform: scale(1.04); opacity: 1; } }
.err-core { position: absolute; inset: 40px; display: flex; align-items: center; justify-content: center; }
.err-core svg { filter: drop-shadow(0 0 28px rgba(99,102,241,.5)); animation: floatY 3s ease-in-out infinite; }
.err-code {
  font-size: clamp(80px, 13vw, 140px);
  font-weight: 900; line-height: 1; letter-spacing: -.04em;
  background: var(--gradient);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
  margin-bottom: 12px;
}
.err-code span { animation: blink 2s ease-in-out infinite; }
@keyframes blink { 0%, 100% { opacity: 1; } 50% { opacity: .35; } }
.err-page h1 { font-size: 26px; font-weight: 700; margin-bottom: 12px; }
.err-page p { font-size: 15px; color: var(--text2); line-height: 1.8; margin-bottom: 34px; }
.err-btns { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; margin-bottom: 30px; }
.err-links { display: flex; gap: 24px; margin-bottom: 30px; }
.err-links a { font-size: 13px; color: var(--text3); text-decoration: none; transition: color var(--tr); }
.err-links a:hover { color: #818cf8; }
.err-count { font-size: 13px; color: var(--text3); }

/* ---- 滚动条 ---- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(99,102,241,.25); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(99,102,241,.4); }

/* ---- 响应式 ---- */
@media (max-width: 1024px) {
  .hero > .hero-inner { grid-template-columns: 1fr; gap: 52px; text-align: center; }
  .hero-text { align-items: center; }
  .hero-desc { max-width: 100%; }
  .hero-btns, .metrics { justify-content: center; }
  .platform-bar { flex-direction: column; gap: 12px; border-radius: var(--r-lg); }
  .feat-grid, .node-grid, .price-grid { grid-template-columns: repeat(2, 1fr); }
  .f-card.f-1 { right: 0; }
  .f-card.f-2 { left: 0; }
}
@media (max-width: 860px) {
  .nav {
    position: fixed; top: 0; right: -100%;
    width: 280px; height: 100vh;
    flex-direction: column;
    background: rgba(11,17,32,.98);
    backdrop-filter: blur(20px);
    padding: 100px 24px 24px;
    gap: 4px;
    transition: right var(--tr);
  }
  .nav.open { right: 0; }
  .menu-btn { display: flex; }
  .nav-link, .btn-header { width: 100%; text-align: center; justify-content: center; }
  .btn-header { margin-left: 0; }
}
@media (max-width: 768px) {
  .hero { padding: 110px 20px 0; }
  .metrics { gap: 22px; }
  .metric strong { font-size: 22px; }
  .f-card { display: none; }
  .features, .nodes, .pricing { padding-top: 80px; }
  .cta { padding: 80px 0; }
  .dl-page { padding: 120px 0 80px; }
  .foot-grid { grid-template-columns: 1fr 1fr; }
  .err-btns { flex-direction: column; width: 100%; max-width: 300px; }
}
@media (max-width: 560px) {
  .feat-grid, .node-grid, .price-grid, .dl-grid { grid-template-columns: 1fr; max-width: 400px; margin-left: auto; margin-right: auto; }
  .dl-grid { margin-bottom: 60px; }
  .guide-row { flex-direction: column; align-items: center; }
  .garr { transform: rotate(90deg); }
  .gstep { max-width: 100%; width: 100%; }
  .cta-card { padding: 48px 28px; }
  .foot-grid { grid-template-columns: 1fr; gap: 24px; }
}