/* ============================================================
   SIPOPC · 超级IP一人公司  官网样式系统
   Design language: 深空蓝底 + 青蓝紫渐变 · 科技感 · 网格纹理
   ============================================================ */

:root {
  /* 背景层 */
  --bg:            #060911;
  --bg-soft:       #0a0f1d;
  --bg-card:       #0e1526;
  --bg-card-hi:    #131c31;

  /* 描边与分割 */
  --line:          rgba(255, 255, 255, 0.08);
  --line-strong:   rgba(255, 255, 255, 0.16);

  /* 文字 */
  --text:          #e9eefb;
  --text-dim:      #a3b0cc;
  --text-mute:     #6c7a99;

  /* 品牌色 */
  --blue:          #4d7cff;
  --cyan:          #22d3ee;
  --violet:        #a855f7;
  --amber:         #f7b545;
  --green:         #34d399;
  --rose:          #fb7185;

  --grad:          linear-gradient(120deg, #4d7cff 0%, #22d3ee 55%, #a855f7 100%);
  --grad-soft:     linear-gradient(120deg, rgba(77,124,255,.16), rgba(168,85,247,.16));

  /* 尺度 */
  --maxw: 1200px;
  --radius: 18px;
  --radius-sm: 12px;
  --nav-h: 68px;

  --ease: cubic-bezier(.22, .68, .36, 1);
}

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

html { scroll-behavior: smooth; scroll-padding-top: calc(var(--nav-h) + 16px); }

body {
  font-family: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei",
               -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* 全局背景装饰 */
body::before {
  content: "";
  position: fixed; inset: 0; z-index: -2;
  background:
    radial-gradient(900px 520px at 12% -8%,  rgba(77,124,255,.20), transparent 62%),
    radial-gradient(760px 480px at 88% 4%,   rgba(168,85,247,.16), transparent 60%),
    radial-gradient(1000px 620px at 50% 108%, rgba(34,211,238,.13), transparent 62%);
}
body::after {
  content: "";
  position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background-image:
    linear-gradient(rgba(255,255,255,.028) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.028) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 90% 70% at 50% 24%, #000 25%, transparent 78%);
  -webkit-mask-image: radial-gradient(ellipse 90% 70% at 50% 24%, #000 25%, transparent 78%);
}

::selection { background: rgba(77,124,255,.42); color: #fff; }

/* 数字统一等宽，避免跳动 */
.num, .stat-value {
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
}

/* ========== 布局 ========== */
.wrap { width: min(100% - 44px, var(--maxw)); margin-inline: auto; }

.section { padding: 80px 0; position: relative; }

.sec-head { max-width: 760px; margin-bottom: 40px; }
.sec-head.center { margin-inline: auto; text-align: center; }

.sec-tag {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 12px; font-weight: 600; letter-spacing: .16em;
  color: var(--cyan); text-transform: uppercase;
  padding: 6px 14px; border-radius: 999px;
  border: 1px solid rgba(34,211,238,.26);
  background: rgba(34,211,238,.07);
  margin-bottom: 20px;
}
.sec-tag::before {
  content: ""; width: 6px; height: 6px; border-radius: 50%;
  background: var(--cyan); box-shadow: 0 0 10px var(--cyan);
}

h1, h2, h3, h4 { line-height: 1.25; font-weight: 700; letter-spacing: -.01em; }

.sec-title { font-size: clamp(27px, 3.6vw, 42px); }
.sec-title em {
  font-style: normal;
  background: var(--grad);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.sec-sub { margin-top: 16px; color: var(--text-dim); font-size: 16px; line-height: 1.85; }

/* ========== 导航 ========== */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--nav-h);
  display: flex; align-items: center;
  transition: background .35s var(--ease), border-color .35s var(--ease), backdrop-filter .35s;
  border-bottom: 1px solid transparent;
}
.nav.scrolled {
  background: rgba(6,9,17,.78);
  backdrop-filter: blur(18px) saturate(160%);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  border-bottom-color: var(--line);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; width: 100%; }

.brand { display: flex; align-items: center; gap: 11px; text-decoration: none; }
.brand-mark {
  width: 36px; height: 36px; border-radius: 10px;
  background: var(--grad);
  display: grid; place-items: center;
  font-weight: 800; font-size: 15px; color: #04122b; letter-spacing: -.5px;
  box-shadow: 0 6px 20px rgba(77,124,255,.34);
  flex: none;
}
.brand-name { font-size: 16px; font-weight: 700; letter-spacing: .02em; color: #a8c8ff; }
.brand-name small {
  display: block; font-size: 10.5px; font-weight: 500; letter-spacing: .2em;
  color: var(--text-mute); line-height: 1.2;
}

.nav-links { display: flex; align-items: center; gap: 4px; }
.nav-links a {
  font-size: 13.5px; color: var(--text-dim); text-decoration: none;
  padding: 8px 13px; border-radius: 8px; transition: .22s var(--ease);
  white-space: nowrap;
}
.nav-links a:hover { color: var(--text); background: rgba(255,255,255,.06); }
.nav-links a.active { color: #fff; background: rgba(77,124,255,.18); }

.nav-cta {
  display: inline-flex; align-items: center; gap: 7px;
  font-size: 13.5px; font-weight: 600; color: #04122b;
  background: var(--grad); text-decoration: none;
  padding: 9px 18px; border-radius: 10px; white-space: nowrap;
  box-shadow: 0 6px 22px rgba(77,124,255,.3);
  transition: transform .22s var(--ease), box-shadow .22s var(--ease);
}
.nav-cta:hover { transform: translateY(-2px); box-shadow: 0 10px 30px rgba(77,124,255,.42); }

.burger { display: none; width: 40px; height: 40px; border: 1px solid var(--line);
  background: rgba(255,255,255,.04); border-radius: 10px; cursor: pointer; }
.burger span { display: block; width: 17px; height: 1.8px; background: var(--text);
  margin: 3.6px auto; border-radius: 2px; transition: .28s var(--ease); }
.burger.open span:nth-child(1) { transform: translateY(5.4px) rotate(45deg); }
.burger.open span:nth-child(2) { opacity: 0; }
.burger.open span:nth-child(3) { transform: translateY(-5.4px) rotate(-45deg); }

.mobile-menu {
  position: fixed; inset: var(--nav-h) 0 auto 0; z-index: 99;
  background: rgba(8,12,22,.97);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--line);
  padding: 14px 22px 22px;
  display: none; flex-direction: column; gap: 2px;
  max-height: calc(100vh - var(--nav-h)); overflow-y: auto;
}
.mobile-menu.show { display: flex; }
.mobile-menu a {
  color: var(--text-dim); text-decoration: none; font-size: 15px;
  padding: 12px 8px; border-bottom: 1px solid rgba(255,255,255,.05);
}
.mobile-menu a:last-child { border-bottom: 0; }

/* ========== 按钮 ========== */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 9px;
  font-size: 15px; font-weight: 600; text-decoration: none; cursor: pointer;
  padding: 14px 28px; border-radius: 13px; border: 1px solid transparent;
  transition: transform .24s var(--ease), box-shadow .24s var(--ease), background .24s;
  font-family: inherit;
}
.btn-primary { background: var(--grad); color: #04122b; box-shadow: 0 10px 32px rgba(77,124,255,.34); }
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 16px 42px rgba(77,124,255,.48); }
.btn-ghost { background: rgba(255,255,255,.05); color: var(--text); border-color: var(--line-strong); }
.btn-ghost:hover { background: rgba(255,255,255,.1); transform: translateY(-3px); }

/* ========== Hero ========== */
.hero { padding: calc(var(--nav-h) + 84px) 0 76px; position: relative; overflow: hidden; }

.hero-grid { display: block; }
.hero-copy { min-width: 0; max-width: 880px; margin-inline: auto; text-align: center; position: relative; }

/* Hero 浮动标签：浮于文字区外围，不占布局空间 */
.hero-tags {
  position: absolute; inset: 0; pointer-events: none; z-index: 2;
}
.hero-tag {
  position: absolute;
  display: inline-flex; align-items: center; gap: 9px;
  padding: 10px 16px; border-radius: 13px;
  font-size: 12.5px; font-weight: 600; white-space: nowrap;
  background: rgba(14,21,38,.92); border: 1px solid var(--line-strong);
  box-shadow: 0 14px 36px rgba(0,0,0,.44);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  animation: floaty 5s ease-in-out infinite;
}
.hero-tag i { width: 7px; height: 7px; border-radius: 50%; flex: none; }

.hero-tag.t1 { top: 4px;  right: -28px; animation-delay: .2s; }
.hero-tag.t2 {
  top: 50%; left: -58px;
  animation-name: floaty-mid;
  animation-delay: 1.5s;
}
.hero-tag.t3 { bottom: 6px; right: -20px; animation-delay: 2.7s; }

@keyframes floaty {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-11px); }
}
@keyframes floaty-mid {
  0%, 100% { transform: translateY(-50%); }
  50%      { transform: translateY(calc(-50% - 11px)); }
}

.hero h1 { font-size: clamp(38px, 6vw, 68px); letter-spacing: -.025em; color: #ffffff; }
.hero h1 .l1 { display: block; }
.hero-slogan {
  margin-top: 20px; font-size: clamp(17px, 2.1vw, 22px);
  color: var(--text-dim); font-weight: 300; letter-spacing: .04em;
}
.hero-desc {
  margin: 24px auto 0; color: var(--text-dim);
  font-size: clamp(15px, 1.5vw, 16.5px); line-height: 1.9;
  max-width: 720px;
}

.hero-actions { margin-top: 38px; display: flex; gap: 14px; flex-wrap: wrap; justify-content: center; }

.hero-meta {
  margin: 52px auto 0; padding-top: 30px; border-top: 1px solid var(--line);
  display: flex; gap: 34px; flex-wrap: wrap; justify-content: center;
}
.hero-meta div span {
  display: block; font-size: 11.5px; color: var(--text-mute);
  letter-spacing: .12em; text-transform: uppercase; margin-bottom: 4px;
}
.hero-meta div strong { font-size: 15px; font-weight: 600; }

/* 飞轮 SVG（商业模式板块复用） */
.wheel-svg { width: 100%; height: auto; display: block; }
.wheel-spin { transform-origin: 200px 200px; animation: spin 26s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ========== 数据条 ========== */
.stat-strip { border-block: 1px solid var(--line); background: rgba(255,255,255,.018); }
.stat-grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.stat {
  padding: 34px 24px; text-align: center;
  border-right: 1px solid var(--line);
}
.stat:last-child { border-right: 0; }
.stat-value {
  font-size: clamp(28px, 3.4vw, 40px); font-weight: 800; line-height: 1.1;
  background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.stat-value .u { font-size: .5em; margin-left: 3px; }
.stat-label { margin-top: 8px; font-size: 13px; color: var(--text-dim); }
.stat-note { font-size: 11.5px; color: var(--text-mute); margin-top: 3px; }

/* ========== 卡片 ========== */
.card {
  background: var(--bg-card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 30px 28px;
  transition: transform .3s var(--ease), border-color .3s var(--ease), background .3s;
  position: relative; overflow: hidden;
}
.card::before {
  content: ""; position: absolute; inset: 0 0 auto 0; height: 1px;
  background: var(--grad); opacity: 0; transition: opacity .3s;
}
.card:hover { transform: translateY(-6px); border-color: var(--line-strong); background: var(--bg-card-hi); }
.card:hover::before { opacity: 1; }

.card-icon {
  width: 46px; height: 46px; border-radius: 13px; display: grid; place-items: center;
  background: var(--grad-soft); border: 1px solid var(--line-strong);
  margin-bottom: 18px; font-size: 21px;
}
.card h3 { font-size: 18px; margin-bottom: 10px; }
.card p { color: var(--text-dim); font-size: 14.5px; }

.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }

/* 市场机遇卡片 */
.mkt-card .big-num {
  font-size: 40px; font-weight: 800; line-height: 1;
  background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.mkt-card .big-num small { font-size: 15px; margin-left: 3px; }
.mkt-card .src { margin-top: 14px; font-size: 11.5px; color: var(--text-mute);
  padding-top: 12px; border-top: 1px dashed var(--line); }

/* 用户画像 */
.persona { display: flex; gap: 16px; align-items: flex-start; }
.persona .idx {
  width: 34px; height: 34px; border-radius: 10px; flex: none;
  display: grid; place-items: center; font-size: 14px; font-weight: 700;
  background: rgba(77,124,255,.16); color: #9dbaff; border: 1px solid rgba(77,124,255,.3);
}

/* ========== 产品：智能体流水线 ========== */
.agent-flow {
  margin-top: 8px; padding: 30px 24px;
  background: linear-gradient(150deg, rgba(14,21,38,.9), rgba(9,13,25,.9));
  border: 1px solid var(--line); border-radius: 22px;
  overflow-x: auto;
}
.agent-track { display: flex; align-items: stretch; gap: 0; min-width: 900px; }
.agent {
  flex: 1; text-align: center; padding: 20px 12px; cursor: pointer;
  border-radius: 14px; border: 1px solid transparent;
  transition: .28s var(--ease); position: relative;
}
.agent:hover { background: rgba(255,255,255,.04); }
.agent.active { background: rgba(77,124,255,.14); border-color: rgba(77,124,255,.42); }
.agent .dot {
  width: 40px; height: 40px; margin: 0 auto 12px; border-radius: 50%;
  display: grid; place-items: center; font-size: 16px;
  background: rgba(255,255,255,.05); border: 1px solid var(--line-strong);
  transition: .28s var(--ease);
}
.agent.active .dot { background: var(--grad); color: #04122b; border-color: transparent;
  box-shadow: 0 0 0 5px rgba(77,124,255,.14), 0 8px 22px rgba(77,124,255,.4); }
.agent b { display: block; font-size: 13.5px; font-weight: 600; }
.agent span { display: block; font-size: 11px; color: var(--text-mute); margin-top: 3px; letter-spacing: .04em; }
.agent-arrow { align-self: center; color: var(--line-strong); font-size: 15px; flex: none; width: 20px; text-align: center; }

.agent-detail {
  margin-top: 22px; padding: 24px 26px; border-radius: 15px;
  background: rgba(77,124,255,.07); border: 1px solid rgba(77,124,255,.24);
  min-height: 92px;
}
.agent-detail h4 { font-size: 16px; margin-bottom: 8px; }
.agent-detail h4 em { font-style: normal; color: var(--cyan); font-size: 12px;
  margin-left: 10px; letter-spacing: .1em; text-transform: uppercase; }
.agent-detail p { color: var(--text-dim); font-size: 14.5px; }

.agent-note {
  margin-top: 18px; font-size: 13px; color: var(--text-mute);
  display: flex; align-items: center; gap: 9px;
}
.agent-note b { color: var(--cyan); font-weight: 600; }

/* ========== 产品阶梯 ========== */
.ladder { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.step {
  position: relative; padding: 26px 22px; border-radius: var(--radius);
  background: var(--bg-card); border: 1px solid var(--line);
  transition: .3s var(--ease);
}
.step:hover { transform: translateY(-6px); border-color: var(--line-strong); }
.step .lv {
  font-size: 11px; letter-spacing: .16em; text-transform: uppercase;
  color: var(--cyan); font-weight: 700;
}
.step h4 { margin: 10px 0 8px; font-size: 17px; }
.step p { font-size: 13.5px; color: var(--text-dim); }
.step::after {
  content: "→"; position: absolute; right: -13px; top: 50%; transform: translateY(-50%);
  color: var(--line-strong); font-size: 17px; z-index: 2;
}
.step:last-child::after { display: none; }

/* ========== 商业模式飞轮 ========== */
.flywheel-wrap { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.flywheel-box {
  background: linear-gradient(155deg, rgba(19,28,49,.85), rgba(10,15,29,.85));
  border: 1px solid var(--line); border-radius: 24px; padding: 24px;
}
.fly-list { display: flex; flex-direction: column; gap: 14px; }
.fly-item {
  display: flex; gap: 16px; align-items: flex-start;
  padding: 18px 20px; border-radius: 14px;
  background: rgba(255,255,255,.032); border: 1px solid var(--line);
  transition: .3s var(--ease);
}
.fly-item:hover { background: rgba(255,255,255,.06); transform: translateX(6px); }
.fly-item .no {
  width: 30px; height: 30px; border-radius: 9px; flex: none; display: grid; place-items: center;
  font-size: 12.5px; font-weight: 700; color: #04122b;
}
.fly-item h4 { font-size: 15.5px; margin-bottom: 5px; }
.fly-item p { font-size: 13.5px; color: var(--text-dim); }

/* ========== 表格 ========== */
.table-wrap {
  overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--bg-card);
}
table { width: 100%; border-collapse: collapse; min-width: 660px; font-size: 14px; }
thead th {
  background: rgba(77,124,255,.12); color: #fff; font-weight: 600;
  padding: 15px 18px; text-align: left; white-space: nowrap;
  border-bottom: 1px solid var(--line-strong); font-size: 13.5px;
}
tbody td { padding: 15px 18px; border-bottom: 1px solid var(--line); color: var(--text-dim); vertical-align: top; }
tbody tr:last-child td { border-bottom: 0; }
tbody tr { transition: background .2s; }
tbody tr:hover { background: rgba(255,255,255,.032); }
td.strong, th.strong { color: #fff; font-weight: 600; }
tfoot td { padding: 15px 18px; font-weight: 700; color: #fff;
  background: rgba(77,124,255,.09); border-top: 1px solid var(--line-strong); }
.hl-blue { color: #7ea6ff; }
.hl-cyan { color: var(--cyan); }
.hl-violet { color: #c58bff; }

/* ========== 竞争分析 ========== */
.comp-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }

.comp {
  display: flex; flex-direction: column;
  padding: 24px 22px; border-radius: var(--radius);
  background: var(--bg-card); border: 1px solid var(--line);
  position: relative; overflow: hidden;
  transition: transform .3s var(--ease), border-color .3s var(--ease), background .3s;
}
/* 顶部状态色条 */
.comp::before {
  content: ""; position: absolute; inset: 0 0 auto 0; height: 2px;
  background: var(--rose); opacity: .7;
}
.comp.us::before { background: var(--grad); opacity: 1; }

.comp:hover { transform: translateY(-6px); border-color: var(--line-strong); background: var(--bg-card-hi); }

.comp .tag {
  align-self: flex-start; font-size: 11px; letter-spacing: .12em; text-transform: uppercase;
  color: var(--text-mute); font-weight: 600;
  padding: 4px 10px; border-radius: 999px;
  border: 1px solid var(--line); background: rgba(255,255,255,.04);
  margin-bottom: 14px;
}
.comp.us .tag {
  color: #04122b; border-color: transparent;
  background: var(--grad); font-weight: 700;
}

.comp h4 { font-size: 16.5px; margin-bottom: 4px; }
.comp.us h4 { color: #fff; }

.comp ul {
  list-style: none; margin-top: 14px;
  display: flex; flex-direction: column;
}
.comp li {
  font-size: 13.5px; color: var(--text-dim);
  padding: 8px 0 8px 20px; position: relative;
  border-top: 1px dashed var(--line);
}
.comp li::before {
  content: "✕"; position: absolute; left: 2px; top: 8px;
  color: var(--rose); font-size: 11px; font-weight: 700;
}
.comp.us li::before { content: "✓"; color: var(--green); }
.comp.us li { color: var(--text); }

/* 三重优势：做 / 信 / 赚 */
.adv-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px;
  margin-top: 30px;
}
.adv {
  position: relative; overflow: hidden;
  padding: 26px 24px; border-radius: var(--radius);
  background: var(--grad-soft);
  border: 1px solid var(--line-strong);
  transition: transform .3s var(--ease), border-color .3s var(--ease);
}
.adv:hover { transform: translateY(-6px); border-color: rgba(34,211,238,.42); }

.adv .q {
  width: 40px; height: 40px; border-radius: 12px;
  display: grid; place-items: center; margin-bottom: 16px;
  font-size: 19px; font-weight: 800; color: #04122b;
  background: var(--grad);
  box-shadow: 0 6px 20px rgba(77,124,255,.3);
}
.adv h4 { font-size: 16.5px; margin-bottom: 8px; }
.adv p { font-size: 13.5px; color: var(--text-dim); line-height: 1.8; }

/* ========== 联系我们 ========== */
.contact-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; max-width: 940px;
  margin-inline: auto;
}
.contact-card {
  position: relative; overflow: hidden; text-align: center;
  padding: 34px 26px 30px; border-radius: var(--radius);
  background: var(--bg-card); border: 1px solid var(--line);
  transition: transform .3s var(--ease), border-color .3s var(--ease), background .3s;
}
.contact-card::before {
  content: ""; position: absolute; inset: 0 0 auto 0; height: 1px;
  background: var(--grad); opacity: 0; transition: opacity .3s;
}
.contact-card:hover {
  transform: translateY(-6px);
  border-color: rgba(34,211,238,.36);
  background: var(--bg-card-hi);
}
.contact-card:hover::before { opacity: 1; }

.contact-card .c-ico {
  width: 52px; height: 52px; margin: 0 auto 18px; border-radius: 15px;
  display: grid; place-items: center; font-size: 23px;
  background: var(--grad-soft);
  border: 1px solid var(--line-strong);
}
.contact-card h3 { font-size: 14px; font-weight: 600; color: var(--text-mute);
  letter-spacing: .1em; margin-bottom: 12px; }
.contact-card .c-name {
  font-size: 21px; font-weight: 700; color: #fff; line-height: 1.4;
  word-break: break-all;
}
.contact-card .c-name a {
  color: #fff; text-decoration: none;
  background: linear-gradient(120deg, #4d7cff, #22d3ee, #a855f7);
  -webkit-background-clip: text; background-clip: text; color: transparent;
  transition: opacity .22s var(--ease);
}
.contact-card .c-name a:hover { opacity: .78; }
.contact-card .c-note {
  margin-top: 14px; padding-top: 14px;
  border-top: 1px dashed var(--line);
  font-size: 12.5px; color: var(--text-mute); line-height: 1.7;
}

/* ========== 结语 CTA ========== */
.cta-band {
  position: relative; overflow: hidden; text-align: center;
  padding: 72px 40px; border-radius: 28px;
  background: linear-gradient(140deg, rgba(77,124,255,.18), rgba(168,85,247,.15));
  border: 1px solid var(--line-strong);
}
.cta-band::before {
  content: ""; position: absolute; width: 420px; height: 420px; border-radius: 50%;
  background: radial-gradient(circle, rgba(34,211,238,.18), transparent 68%);
  top: -190px; left: 50%; transform: translateX(-50%);
}
.cta-band > * { position: relative; }
.cta-band h2 { font-size: clamp(26px, 3.6vw, 40px); }
.cta-band h2 em { font-style: normal; background: var(--grad);
  -webkit-background-clip: text; background-clip: text; color: transparent; }
.cta-band p { margin: 20px auto 34px; max-width: 620px; color: var(--text-dim); font-size: 15.5px; }
.cta-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* ========== 页脚 ========== */
.footer { border-top: 1px solid var(--line); padding: 48px 0 34px;
  background: rgba(255,255,255,.014); }
.footer-top { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 40px; }
.footer .brand { margin-bottom: 16px; }
.footer-desc { font-size: 13.5px; color: var(--text-mute); max-width: 300px; }
.footer h5 { font-size: 13px; letter-spacing: .1em; text-transform: uppercase;
  color: var(--text-dim); margin-bottom: 16px; }
.footer ul { list-style: none; display: flex; flex-direction: column; gap: 10px; }
.footer ul a { font-size: 13.5px; color: var(--text-mute); text-decoration: none; transition: color .2s; }
.footer ul a:hover { color: var(--cyan); }
.footer-bot {
  margin-top: 40px; padding-top: 24px; border-top: 1px solid var(--line);
  display: flex; justify-content: space-between; gap: 18px; flex-wrap: wrap;
  font-size: 12.5px; color: var(--text-mute);
}
.footer-domain {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  color: var(--cyan); letter-spacing: .04em;
}
.footer-bot a { text-decoration: none; transition: opacity .2s; }
.footer-bot a:hover { opacity: .72; }

/* ========== 滚动进场动效 ========== */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .8s var(--ease), transform .8s var(--ease); }
.reveal.in { opacity: 1; transform: none; }
.reveal.d1 { transition-delay: .1s; }
.reveal.d2 { transition-delay: .2s; }
.reveal.d3 { transition-delay: .3s; }
.reveal.d4 { transition-delay: .4s; }

/* 回到顶部 */
.to-top {
  position: fixed; right: 26px; bottom: 26px; z-index: 90;
  width: 44px; height: 44px; border-radius: 13px; cursor: pointer;
  display: grid; place-items: center; font-size: 17px;
  background: rgba(14,21,38,.9); border: 1px solid var(--line-strong);
  color: var(--text); backdrop-filter: blur(10px);
  opacity: 0; visibility: hidden; transform: translateY(14px);
  transition: .3s var(--ease);
}
.to-top.show { opacity: 1; visibility: visible; transform: none; }
.to-top:hover { background: var(--bg-card-hi); border-color: var(--cyan); }

/* ========== 响应式 ========== */
@media (max-width: 1080px) {
  .nav-links { display: none; }
  .burger { display: block; }
  .nav-cta.desk { display: none; }
  .hero-tags { display: none; }   /* 空间不足，隐藏浮动标签避免压住正文 */

  .flywheel-wrap { grid-template-columns: 1fr; }
  .comp-grid { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .footer-top { grid-template-columns: 1fr 1fr; }
  .flywheel-wrap { gap: 34px; }
}

/* 导航项较多，中等屏收紧间距 */
@media (max-width: 1200px) and (min-width: 1081px) {
  .nav-links a { font-size: 13px; padding: 8px 10px; }
  .nav-cta { font-size: 13px; padding: 9px 15px; }
  /* 空间收窄：标签内移，避免贴边 */
  .hero-tag.t1 { right: 0; }
  .hero-tag.t2 { left: -12px; }
  .hero-tag.t3 { right: 0; }
}

@media (max-width: 820px) {
  .section { padding: 56px 0; }
  .grid-3, .grid-4, .ladder, .adv-grid, .contact-grid { grid-template-columns: 1fr; }
  .comp-grid { grid-template-columns: 1fr; }
  .stat-grid { grid-template-columns: repeat(2, 1fr); }
  .stat:nth-child(2) { border-right: 0; }
  .stat:nth-child(1), .stat:nth-child(2) { border-bottom: 1px solid var(--line); }
  .step::after { display: none; }
  .cta-band { padding: 60px 24px; }
  .contact-grid { max-width: none; }
  .footer-top { grid-template-columns: 1fr; gap: 30px; }
}

@media (max-width: 520px) {
  .wrap { width: calc(100% - 32px); }
  .hero { padding-top: calc(var(--nav-h) + 44px); }
  .hero-meta { gap: 20px; }
  .stat { padding: 24px 12px; }
  .sec-head { margin-bottom: 30px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition-duration: .01ms !important; }
  .reveal { opacity: 1; transform: none; }
}