/* ============================================================
   DNF多版本助手中心 · 主样式
   设计基调：浅色 / 蓝主色 / 橙强调 / 大留白 / 柔和卡片
   ============================================================ */

:root {
  --blue-50: #eff5ff;
  --blue-100: #dbe8ff;
  --blue-200: #bfd7ff;
  --blue-500: #3b82f6;
  --blue-600: #2563eb;
  --blue-700: #1d4ed8;
  --blue-900: #172554;

  --orange-500: #f97316;
  --orange-600: #ea580c;

  --ink: #0f172a;
  --ink-2: #334155;
  --muted: #64748b;
  --muted-2: #94a3b8;

  --line: #e6ecf5;
  --bg: #ffffff;
  --soft: #f6f9ff;

  --radius-sm: 10px;
  --radius: 16px;
  --radius-lg: 24px;

  --shadow-sm: 0 1px 2px rgba(15, 23, 42, .05);
  --shadow: 0 8px 24px -12px rgba(15, 23, 42, .16);
  --shadow-lg: 0 28px 60px -28px rgba(23, 37, 84, .32);

  --wrap: 1180px;
  --nav-h: 70px;

  --ease: cubic-bezier(.22, .68, 0, 1);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 18px);
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Source Han Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  color: var(--ink);
  background: var(--bg);
  font-size: 16px;
  line-height: 1.75;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
h1, h2, h3, h4 {
  line-height: 1.3;
  letter-spacing: -.01em;
  font-weight: 700;
  text-wrap: balance;
}
p { text-wrap: pretty; }

.container {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 24px;
}

.svg-sprite { position: absolute; width: 0; height: 0; overflow: hidden; }

.ico {
  width: 18px; height: 18px;
  flex: none;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.grad {
  background: linear-gradient(96deg, var(--blue-600), #4f8cff 45%, var(--orange-500));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ---------------- 按钮 ---------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 13px 24px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .2px;
  white-space: nowrap;
  transition: transform .25s var(--ease), box-shadow .25s var(--ease), background .2s, border-color .2s, color .2s;
}
.btn .ico { width: 17px; height: 17px; }

.btn-primary {
  background: linear-gradient(135deg, var(--blue-600), #3f7cf7);
  color: #fff;
  box-shadow: 0 12px 26px -12px rgba(37, 99, 235, .8);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 18px 34px -14px rgba(37, 99, 235, .85);
}

.btn-ghost {
  background: #fff;
  color: var(--ink-2);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-sm);
}
.btn-ghost:hover {
  border-color: var(--blue-200);
  color: var(--blue-700);
  transform: translateY(-2px);
}

.btn-outline {
  width: 100%;
  margin-top: 22px;
  background: #fff;
  color: var(--blue-700);
  border: 1px solid var(--blue-200);
}
.btn-outline:hover { background: var(--blue-50); border-color: var(--blue-500); }

.btn-lg { padding: 15px 30px; font-size: 16px; }

/* ---------------- 导航 ---------------- */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 90;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  background: rgba(255, 255, 255, .78);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color .3s, box-shadow .3s, background .3s;
}
.navbar.is-stuck {
  border-bottom-color: var(--line);
  box-shadow: 0 6px 24px -18px rgba(15, 23, 42, .5);
}

.nav-inner {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 17px;
  letter-spacing: -.2px;
  flex: none;
}
.brand-mark {
  width: 34px; height: 34px;
  display: grid;
  place-items: center;
  border-radius: 10px;
  color: #fff;
  background: linear-gradient(140deg, var(--blue-600), #4f8cff 60%, var(--orange-500));
  box-shadow: 0 8px 18px -8px rgba(37, 99, 235, .9);
}
.brand-mark .ico { width: 19px; height: 19px; }

.nav-menu {
  display: flex;
  align-items: center;
  gap: 2px;
  margin-left: auto;
}
.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 13px;
  border-radius: 999px;
  font-size: 14.5px;
  color: var(--ink-2);
  font-weight: 500;
  transition: color .2s, background .2s;
}
.nav-link .ico { width: 15px; height: 15px; opacity: .65; }
.nav-link:hover { color: var(--blue-700); background: var(--blue-50); }
.nav-link.is-active { color: var(--blue-700); background: var(--blue-50); font-weight: 600; }
.nav-link.is-active .ico { opacity: 1; }

.nav-link--cta {
  margin-left: 8px;
  background: var(--ink);
  color: #fff;
  padding: 9px 18px;
}
.nav-link--cta .ico { opacity: .9; }
.nav-link--cta:hover { background: var(--blue-700); color: #fff; }

.hamburger {
  display: none;
  margin-left: auto;
  width: 42px; height: 42px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: #fff;
  place-items: center;
  gap: 4px;
  flex-direction: column;
}
.hamburger span {
  display: block;
  width: 18px; height: 2px;
  border-radius: 2px;
  background: var(--ink);
  transition: transform .3s var(--ease), opacity .2s;
}
.hamburger.is-open span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.hamburger.is-open span:nth-child(2) { opacity: 0; }
.hamburger.is-open span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ---------------- Hero ---------------- */
.hero {
  position: relative;
  padding: calc(var(--nav-h) + 68px) 0 84px;
  overflow: hidden;
  background: linear-gradient(178deg, #f4f8ff 0%, #ffffff 62%, #f8fbff 100%);
}
.hero-bg { position: absolute; inset: 0; pointer-events: none; }

.blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(70px);
  opacity: .55;
}
.blob-1 {
  width: 520px; height: 520px;
  top: -180px; left: -120px;
  background: radial-gradient(circle at 40% 40%, #cfe0ff, transparent 68%);
}
.blob-2 {
  width: 460px; height: 460px;
  top: -60px; right: -140px;
  background: radial-gradient(circle at 50% 50%, #ffe3cc, transparent 66%);
}
.grid-lines {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(37, 99, 235, .055) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(37, 99, 235, .055) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 78% 62% at 50% 22%, #000 25%, transparent 78%);
  -webkit-mask-image: radial-gradient(ellipse 78% 62% at 50% 22%, #000 25%, transparent 78%);
}

.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.06fr) minmax(0, .94fr);
  gap: 56px;
  align-items: center;
}

.hero-copy { max-width: 620px; }

.badge {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 7px 15px 7px 12px;
  border-radius: 999px;
  border: 1px solid var(--blue-100);
  background: rgba(255, 255, 255, .8);
  color: var(--blue-700);
  font-size: 13px;
  font-weight: 600;
  box-shadow: var(--shadow-sm);
}
.pulse {
  position: relative;
  width: 7px; height: 7px;
  border-radius: 50%;
  background: #10b981;
}
.pulse::after {
  content: "";
  position: absolute; inset: -4px;
  border-radius: 50%;
  border: 1px solid rgba(16, 185, 129, .5);
  animation: ping 1.9s ease-out infinite;
}
@keyframes ping {
  0% { transform: scale(.7); opacity: .9; }
  100% { transform: scale(1.9); opacity: 0; }
}

.hero-title {
  margin: 22px 0 18px;
  font-size: clamp(34px, 4.4vw, 55px);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -.028em;
}
.hero-sub {
  font-size: 17.5px;
  color: var(--ink-2);
  font-weight: 500;
  line-height: 1.72;
}
.hero-desc {
  margin-top: 14px;
  font-size: 15px;
  color: var(--muted);
  line-height: 1.85;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.hero-trust {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  margin-top: 26px;
  font-size: 13.5px;
  color: var(--muted);
  font-weight: 500;
}
.hero-trust li { display: inline-flex; align-items: center; gap: 7px; }
.hero-trust .ico { width: 16px; height: 16px; color: var(--blue-600); }

/* Hero 数据卡 */
.hero-stats {
  display: grid;
  gap: 14px;
}
.stat {
  position: relative;
  padding: 24px 26px;
  border-radius: var(--radius);
  background: rgba(255, 255, 255, .86);
  border: 1px solid #e8eefb;
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: transform .35s var(--ease), box-shadow .35s var(--ease), border-color .3s;
}
.stat::before {
  content: "";
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  background: linear-gradient(to bottom, var(--blue-600), var(--orange-500));
  opacity: 0;
  transition: opacity .3s;
}
.stat:hover {
  transform: translateY(-3px);
  border-color: var(--blue-200);
  box-shadow: var(--shadow-lg);
}
.stat:hover::before { opacity: 1; }

.stat strong {
  display: block;
  font-size: 38px;
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -.03em;
  background: linear-gradient(120deg, var(--blue-700), #4f8cff 72%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.stat strong .unit { font-size: 18px; margin-left: 2px; }
.stat p {
  margin-top: 7px;
  font-size: 13px;
  color: var(--muted);
  line-height: 1.6;
}

/* ---------------- 通用区块 ---------------- */
.section { padding: 92px 0; }
.section--soft { background: var(--soft); border-block: 1px solid #eef3fb; }

.section-head {
  max-width: 760px;
  margin: 0 auto 52px;
  text-align: center;
}
.eyebrow {
  display: inline-block;
  padding: 5px 13px;
  margin-bottom: 16px;
  border-radius: 999px;
  background: var(--blue-50);
  color: var(--blue-700);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: .08em;
}
.section-head h2 {
  font-size: clamp(25px, 2.7vw, 34px);
  letter-spacing: -.022em;
}
.section-head p {
  margin-top: 14px;
  color: var(--muted);
  font-size: 15.5px;
}

/* ---------------- 演示区 ---------------- */
.demo-wrap {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
  gap: 40px;
  align-items: center;
}

.demo-screen {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: #0b1220;
  border: 1px solid #17243c;
  box-shadow: 0 40px 80px -40px rgba(11, 18, 32, .7);
}
.demo-bar {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 13px 16px;
  background: #101a2c;
  border-bottom: 1px solid #1a2740;
}
.dot { width: 10px; height: 10px; border-radius: 50%; }
.dot.red { background: #ff5f57; }
.dot.amber { background: #febc2e; }
.dot.green { background: #28c840; }
.demo-bar-title {
  margin-left: 10px;
  font-size: 12px;
  color: #7d90ad;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.demo-body {
  display: grid;
  grid-template-columns: 118px 1fr;
  min-height: 320px;
}
.demo-side {
  padding: 18px 14px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  border-right: 1px solid #1a2740;
  background: #0d1626;
}
.sk {
  height: 8px;
  border-radius: 4px;
  background: linear-gradient(90deg, #1e2d47, #253a5c, #1e2d47);
  background-size: 200% 100%;
  animation: shimmer 2.6s linear infinite;
}
.sk.w50 { width: 50%; } .sk.w60 { width: 60%; } .sk.w70 { width: 70%; }
.sk.w80 { width: 80%; } .sk.w90 { width: 90%; }
@keyframes shimmer {
  0% { background-position: 140% 0; }
  100% { background-position: -40% 0; }
}

.demo-stage {
  position: relative;
  display: grid;
  place-content: center;
  justify-items: center;
  gap: 18px;
  padding: 30px;
  background:
    radial-gradient(circle at 50% 42%, rgba(59, 130, 246, .28), transparent 62%),
    repeating-linear-gradient(45deg, rgba(255, 255, 255, .022) 0 12px, transparent 12px 24px);
}
.play-btn {
  width: 72px; height: 72px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  color: #fff;
  background: linear-gradient(145deg, var(--blue-600), #4f8cff);
  box-shadow: 0 0 0 10px rgba(59, 130, 246, .14), 0 18px 40px -14px rgba(59, 130, 246, .9);
  transition: transform .3s var(--ease), box-shadow .3s;
}
.play-btn .ico { width: 30px; height: 30px; stroke-width: 1.4; }
.play-btn:hover {
  transform: scale(1.07);
  box-shadow: 0 0 0 16px rgba(59, 130, 246, .12), 0 22px 46px -14px rgba(59, 130, 246, .95);
}
.demo-caption {
  font-size: 13px;
  color: #9db0cc;
  text-align: center;
  letter-spacing: .01em;
}

.demo-side-copy h3 { font-size: 20px; margin-bottom: 18px; }
.tick-list { display: grid; gap: 12px; }
.tick-list li {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  font-size: 14.5px;
  color: var(--ink-2);
  line-height: 1.7;
}
.tick-list .ico {
  width: 19px; height: 19px;
  margin-top: 3px;
  padding: 2px;
  border-radius: 50%;
  color: #fff;
  background: var(--blue-600);
  stroke-width: 2.6;
}
.muted { margin-top: 18px; font-size: 13px; color: var(--muted-2); }

/* ---------------- 功能卡 ---------------- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.card {
  position: relative;
  padding: 28px 26px 30px;
  border-radius: var(--radius);
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: var(--shadow-sm);
  transition: transform .35s var(--ease), box-shadow .35s var(--ease), border-color .3s;
  overflow: hidden;
}
.card::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(140deg, rgba(37, 99, 235, .05), transparent 55%);
  opacity: 0;
  transition: opacity .35s;
  pointer-events: none;
}
.card:hover {
  transform: translateY(-5px);
  border-color: var(--blue-200);
  box-shadow: 0 26px 50px -30px rgba(23, 37, 84, .4);
}
.card:hover::after { opacity: 1; }

.card-ico {
  display: grid;
  place-items: center;
  width: 46px; height: 46px;
  margin-bottom: 18px;
  border-radius: 13px;
  color: var(--blue-700);
  background: linear-gradient(150deg, #eef4ff, #e2ecff);
  border: 1px solid #dbe7fb;
}
.card-ico .ico { width: 22px; height: 22px; }
.card:hover .card-ico { color: #fff; background: linear-gradient(150deg, var(--blue-600), #4f8cff); border-color: transparent; }

.card h3 { font-size: 17px; margin-bottom: 10px; letter-spacing: -.01em; }
.card p { font-size: 14px; color: var(--muted); line-height: 1.8; }

/* ---------------- 步骤 ---------------- */
.steps {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
  counter-reset: s;
}
.step {
  position: relative;
  padding: 28px 24px;
  border-radius: var(--radius);
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: var(--shadow-sm);
  transition: transform .35s var(--ease), box-shadow .35s var(--ease);
}
.step:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.step::before {
  content: "";
  position: absolute;
  top: -1px; left: 24px;
  width: 44px; height: 3px;
  border-radius: 0 0 3px 3px;
  background: linear-gradient(90deg, var(--blue-600), var(--orange-500));
}
.step-no {
  display: block;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .12em;
  color: var(--blue-600);
  margin-bottom: 12px;
}
.step h3 { font-size: 17px; margin-bottom: 9px; }
.step p { font-size: 14px; color: var(--muted); line-height: 1.8; }

/* ---------------- 使用规范 ---------------- */
.norms {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}
.norm-col {
  padding: 28px 26px;
  border-radius: var(--radius);
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: var(--shadow-sm);
}
.norm-col h3 {
  display: flex;
  align-items: center;
  gap: 11px;
  font-size: 17px;
  padding-bottom: 16px;
  margin-bottom: 16px;
  border-bottom: 1px dashed var(--line);
}
.norm-ico {
  display: grid;
  place-items: center;
  width: 34px; height: 34px;
  border-radius: 10px;
  color: var(--blue-700);
  background: var(--blue-50);
}
.norm-ico .ico { width: 18px; height: 18px; }
.norm-col li {
  position: relative;
  padding-left: 18px;
  margin-bottom: 11px;
  font-size: 14px;
  color: var(--muted);
  line-height: 1.75;
}
.norm-col li::before {
  content: "";
  position: absolute;
  left: 0; top: 10px;
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--blue-200);
}
.norm-col li:last-child { margin-bottom: 0; }

/* ---------------- FAQ ---------------- */
.faq {
  max-width: 860px;
  margin: 0 auto;
  display: grid;
  gap: 12px;
}
.faq-item {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: border-color .3s, box-shadow .3s;
}
.faq-item[open] { border-color: var(--blue-200); box-shadow: var(--shadow); }
.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 19px 24px;
  font-size: 15.5px;
  font-weight: 600;
  color: var(--ink);
  cursor: pointer;
  list-style: none;
  transition: color .2s;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary:hover { color: var(--blue-700); }
.faq-item summary .ico {
  width: 20px; height: 20px;
  color: var(--muted);
  transition: transform .3s var(--ease), color .2s;
}
.faq-item[open] summary .ico { transform: rotate(180deg); color: var(--blue-600); }
.faq-body {
  padding: 0 24px 22px;
  font-size: 14.5px;
  color: var(--muted);
  line-height: 1.85;
}

/* ---------------- 价格 ---------------- */
.price-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
  align-items: stretch;
}
.price-card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 30px 24px 26px;
  border-radius: var(--radius);
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: var(--shadow-sm);
  transition: transform .35s var(--ease), box-shadow .35s var(--ease), border-color .3s;
}
.price-card:hover {
  transform: translateY(-5px);
  border-color: var(--blue-200);
  box-shadow: var(--shadow-lg);
}
.price-card--hot {
  border-color: var(--blue-500);
  box-shadow: 0 26px 60px -30px rgba(37, 99, 235, .55);
}
.price-card--hot:hover { transform: translateY(-7px); }

.price-flag {
  position: absolute;
  top: 14px; right: 14px;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(135deg, var(--orange-500), var(--orange-600));
  box-shadow: 0 6px 14px -6px rgba(234, 88, 12, .9);
}
.price-card h3 {
  font-size: 16px;
  color: var(--ink-2);
  font-weight: 600;
  letter-spacing: .01em;
}
.price {
  margin: 14px 0 22px;
  display: flex;
  align-items: baseline;
  gap: 4px;
  font-size: 40px;
  font-weight: 800;
  letter-spacing: -.03em;
  color: var(--ink);
}
.price .cur { font-size: 20px; font-weight: 700; color: var(--blue-600); }
.price .per { font-size: 13px; font-weight: 500; color: var(--muted-2); margin-left: 2px; }

.price-card ul {
  display: grid;
  gap: 11px;
  padding-top: 20px;
  border-top: 1px dashed var(--line);
  margin-bottom: auto;
}
.price-card li {
  display: flex;
  align-items: flex-start;
  gap: 9px;
  font-size: 13.5px;
  color: var(--muted);
}
.price-card li .ico {
  width: 16px; height: 16px;
  margin-top: 4px;
  color: var(--blue-600);
  stroke-width: 2.6;
}

/* ---------------- CTA 面板 ---------------- */
.cta-panel {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 36px;
  flex-wrap: wrap;
  padding: 46px 46px;
  border-radius: var(--radius-lg);
  color: #fff;
  background:
    radial-gradient(circle at 88% 12%, rgba(249, 115, 22, .38), transparent 46%),
    linear-gradient(120deg, #132a63, #1d4ed8 58%, #2f6bef);
  box-shadow: 0 40px 80px -44px rgba(23, 37, 84, .8);
  overflow: hidden;
}
.cta-panel::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(255, 255, 255, .06) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, .06) 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: linear-gradient(110deg, #000, transparent 68%);
  -webkit-mask-image: linear-gradient(110deg, #000, transparent 68%);
  pointer-events: none;
}
.cta-copy { position: relative; z-index: 1; max-width: 620px; }
.cta-copy h2 { font-size: clamp(23px, 2.4vw, 30px); letter-spacing: -.02em; }
.cta-copy p { margin-top: 12px; color: rgba(255, 255, 255, .82); font-size: 15px; }
.cta-actions { position: relative; z-index: 1; display: flex; gap: 12px; flex-wrap: wrap; }
.cta-actions .btn-primary {
  background: #fff;
  color: var(--blue-700);
  box-shadow: 0 16px 34px -18px rgba(0, 0, 0, .8);
}
.cta-actions .btn-primary:hover { background: #f3f7ff; }
.cta-actions .btn-ghost {
  background: rgba(255, 255, 255, .1);
  border-color: rgba(255, 255, 255, .3);
  color: #fff;
  box-shadow: none;
}
.cta-actions .btn-ghost:hover { background: rgba(255, 255, 255, .18); color: #fff; }

/* ---------------- 关于 / 联系 ---------------- */
.about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(0, .85fr);
  gap: 48px;
  align-items: start;
}
.about-title { font-size: clamp(24px, 2.5vw, 31px); margin-bottom: 18px; letter-spacing: -.022em; }
.about-grid p { color: var(--muted); font-size: 15px; margin-bottom: 14px; line-height: 1.85; }

.about-metrics {
  display: flex;
  flex-wrap: wrap;
  gap: 30px;
  margin-top: 28px;
  padding-top: 26px;
  border-top: 1px solid var(--line);
}
.about-metrics div { display: grid; gap: 2px; }
.about-metrics strong {
  font-size: 26px;
  font-weight: 800;
  letter-spacing: -.02em;
  color: var(--blue-700);
}
.about-metrics span { font-size: 12.5px; color: var(--muted-2); }

.contact-panel {
  padding: 30px 28px;
  border-radius: var(--radius);
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}
.contact-panel h3 { font-size: 17px; margin-bottom: 20px; }
.contact-list { display: grid; gap: 16px; }
.contact-list li { display: flex; gap: 13px; align-items: center; }
.ci {
  display: grid;
  place-items: center;
  width: 38px; height: 38px;
  flex: none;
  border-radius: 11px;
  color: var(--blue-700);
  background: var(--blue-50);
}
.ci .ico { width: 18px; height: 18px; }
.contact-list strong { display: block; font-size: 14px; font-weight: 600; }
.contact-list a { font-size: 13.5px; color: var(--blue-600); }
.contact-list a:hover { text-decoration: underline; }
.contact-list em { font-style: normal; font-size: 13.5px; color: var(--muted); }

/* ---------------- 页脚 ---------------- */
.footer {
  padding: 62px 0 30px;
  background: #0d1526;
  color: #a9b7cd;
  font-size: 14px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1.1fr 1fr;
  gap: 44px;
  padding-bottom: 38px;
  border-bottom: 1px solid rgba(255, 255, 255, .09);
}
.footer-title {
  color: #fff;
  font-weight: 700;
  font-size: 14.5px;
  margin-bottom: 15px;
  letter-spacing: .02em;
}
.footer-col p { line-height: 1.85; }
.footer-col li {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  margin-bottom: 10px;
  line-height: 1.7;
  font-size: 13.5px;
}
.footer-col li .ico { width: 16px; height: 16px; margin-top: 3px; color: #5b7bb5; }
.footer-col a { color: #cbd8ec; transition: color .2s; }
.footer-col a:hover { color: #fff; text-decoration: underline; }

.footer-bottom {
  padding-top: 24px;
  text-align: center;
  font-size: 12.8px;
  color: #7e8fab;
  line-height: 1.9;
}
.footer-bottom a { color: #b9c8de; }
.footer-bottom a:hover { color: #fff; }
.footer-note { margin-top: 6px; color: #6b7c96; }

/* ---------------- 回到顶部 ---------------- */
.to-top {
  position: fixed;
  right: 24px; bottom: 28px;
  z-index: 80;
  width: 46px; height: 46px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  color: #fff;
  background: var(--blue-600);
  box-shadow: 0 14px 30px -12px rgba(37, 99, 235, .9);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity .3s, transform .3s var(--ease), visibility .3s, background .2s;
}
.to-top.is-show { opacity: 1; visibility: visible; transform: translateY(0); }
.to-top:hover { background: var(--blue-700); }

/* ---------------- 动效 ---------------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity .7s var(--ease), transform .7s var(--ease);
}
[data-reveal].in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition-duration: .01ms !important; }
  [data-reveal] { opacity: 1; transform: none; }
  html { scroll-behavior: auto; }
}

/* ---------------- 响应式 ---------------- */
@media (max-width: 1080px) {
  .feature-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .price-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .norms { grid-template-columns: 1fr 1fr; }
  .norms .norm-col:last-child { grid-column: 1 / -1; }
  .hero-inner { gap: 40px; }
}

@media (max-width: 900px) {
  :root { --nav-h: 64px; }

  .hamburger { display: flex; }
  .nav-menu {
    position: fixed;
    top: var(--nav-h);
    left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    padding: 16px 20px 24px;
    background: #fff;
    border-bottom: 1px solid var(--line);
    box-shadow: 0 24px 40px -28px rgba(15, 23, 42, .5);
    transform: translateY(-12px);
    opacity: 0;
    visibility: hidden;
    transition: opacity .28s, transform .28s var(--ease), visibility .28s;
    max-height: calc(100vh - var(--nav-h));
    overflow-y: auto;
  }
  .nav-menu.is-open { opacity: 1; visibility: visible; transform: none; }
  .nav-link { padding: 12px 14px; border-radius: 12px; font-size: 15px; }
  .nav-link--cta { margin-left: 0; margin-top: 6px; justify-content: center; }

  .hero { padding-top: calc(var(--nav-h) + 44px); padding-bottom: 64px; }
  .hero-inner { grid-template-columns: 1fr; gap: 36px; }
  .hero-copy { max-width: none; }
  .hero-stats { grid-template-columns: repeat(3, 1fr); gap: 12px; }
  .stat { padding: 18px 16px; }
  .stat strong { font-size: 26px; }
  .stat p { font-size: 11.5px; }

  .section { padding: 68px 0; }
  .section-head { margin-bottom: 38px; }

  .demo-wrap { grid-template-columns: 1fr; gap: 30px; }
  .demo-body { grid-template-columns: 1fr; }
  .demo-side { display: none; }
  .demo-stage { min-height: 240px; }

  .about-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .footer-col--wide { grid-column: 1 / -1; }
  .cta-panel { padding: 34px 28px; }
}

@media (max-width: 640px) {
  body { font-size: 15.5px; }
  .container { padding: 0 18px; }
  .nav-inner { padding: 0 18px; }
  .brand-text { font-size: 15px; }

  .hero-stats { grid-template-columns: 1fr; }
  .hero-title { font-size: 32px; }
  .hero-sub { font-size: 16px; }
  .hero-actions .btn { flex: 1 1 100%; }

  .feature-grid,
  .steps,
  .price-grid,
  .norms { grid-template-columns: 1fr; }
  .norms .norm-col:last-child { grid-column: auto; }

  .section { padding: 56px 0; }
  .section-head h2 { font-size: 23px; }
  .cta-actions { width: 100%; }
  .cta-actions .btn { flex: 1 1 100%; }

  .footer-grid { grid-template-columns: 1fr; }
  .to-top { right: 16px; bottom: 18px; width: 42px; height: 42px; }
  .faq-item summary { padding: 16px 18px; font-size: 15px; }
  .faq-body { padding: 0 18px 18px; }
}