/* ============================================================
   广告营销开户平台 - 全站样式
   品牌主色: 蓝 #2563eb / 深蓝 #1e3a8a / 紫 #7c3aed
   ============================================================ */
:root {
  --primary: #2563eb;
  --primary-dark: #1e40af;
  --deep: #0f172a;
  --deep-2: #1e293b;
  --accent: #f59e0b;
  --accent-2: #10b981;
  --bg: #ffffff;
  --bg-soft: #f1f5f9;
  --text: #1e293b;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --radius: 16px;
  --shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 20px 50px rgba(15, 23, 42, 0.15);
  --grad: linear-gradient(135deg, #1e3a8a 0%, #2563eb 55%, #7c3aed 100%);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  font-size: 16px;
}
img, svg { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.section { padding: 72px 0; }
.section-head { text-align: center; max-width: 760px; margin: 0 auto 48px; }
.section-head .tag {
  display: inline-block; font-size: 13px; font-weight: 600; color: var(--primary);
  background: #eff6ff; border: 1px solid #bfdbfe; padding: 4px 14px; border-radius: 999px;
  margin-bottom: 14px; letter-spacing: 1px;
}
.section-head h2 { font-size: 32px; line-height: 1.35; color: var(--deep); font-weight: 800; }
.section-head p { color: var(--text-muted); margin-top: 12px; font-size: 16px; }

/* ---------- 顶部导航 ---------- */
.header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.header .container { display: flex; align-items: center; justify-content: space-between; height: 68px; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 20px; color: var(--deep); }
.logo svg { width: 34px; height: 34px; }
.logo span em { font-style: normal; color: var(--primary); }
.nav { display: flex; align-items: center; gap: 28px; }
.nav a { font-size: 15px; color: var(--deep-2); font-weight: 500; position: relative; padding: 6px 0; }
.nav a:hover, .nav a.active { color: var(--primary); }
.nav a::after {
  content: ""; position: absolute; left: 0; bottom: 0; width: 0; height: 2px;
  background: var(--primary); transition: width .25s ease; border-radius: 2px;
}
.nav a:hover::after, .nav a.active::after { width: 100%; }
.nav .cta-btn { margin-left: 6px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  background: var(--primary); color: #fff !important; font-weight: 600;
  padding: 11px 24px; border-radius: 999px; font-size: 15px; border: none; cursor: pointer;
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}
.btn:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 10px 24px rgba(37, 99, 235, 0.35); }
.btn::after { display: none !important; }
.btn.ghost { background: transparent; color: var(--primary) !important; border: 1.5px solid var(--primary); }
.btn.ghost:hover { background: #eff6ff; }
.btn.light { background: #fff; color: var(--primary) !important; }
.btn.light:hover { background: #f8fafc; }
.btn.lg { padding: 14px 34px; font-size: 17px; }
.menu-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 8px; }
.menu-toggle span { width: 24px; height: 2.5px; background: var(--deep); border-radius: 2px; transition: .3s; }

/* ---------- Hero ---------- */
.hero {
  background: var(--grad);
  color: #fff;
  padding: 96px 0 88px;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: ""; position: absolute; inset: 0; opacity: .18;
  background-image: radial-gradient(circle at 20% 30%, #fff 1px, transparent 1px),
    radial-gradient(circle at 80% 70%, #fff 1px, transparent 1px);
  background-size: 46px 46px, 70px 70px;
  pointer-events: none;
}
.hero .container { position: relative; z-index: 1; display: grid; grid-template-columns: 1.15fr .85fr; gap: 48px; align-items: center; }
.hero h1 { font-size: 44px; line-height: 1.3; font-weight: 800; letter-spacing: .5px; }
.hero h1 .hl { color: #fcd34d; }
.hero .sub { margin-top: 20px; font-size: 17px; color: #dbeafe; max-width: 560px; }
.hero .cta-row { display: flex; gap: 16px; margin-top: 34px; flex-wrap: wrap; }
.hero .trust { display: flex; gap: 26px; margin-top: 36px; flex-wrap: wrap; }
.hero .trust div { font-size: 14px; color: #bfdbfe; display: flex; align-items: center; gap: 8px; }
.hero .trust svg { width: 18px; height: 18px; color: #34d399; }
.hero-card {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: 20px;
  padding: 28px;
  backdrop-filter: blur(8px);
}
.hero-card .hc-title { font-size: 18px; font-weight: 700; margin-bottom: 18px; }
.hero-card .platform-chips { display: flex; flex-wrap: wrap; gap: 10px; }
.hero-card .chip {
  background: rgba(255, 255, 255, 0.16); border: 1px solid rgba(255, 255, 255, 0.3);
  padding: 8px 16px; border-radius: 999px; font-size: 14px; font-weight: 500;
}
.hero-card .hc-note { margin-top: 18px; font-size: 13px; color: #dbeafe; border-top: 1px dashed rgba(255,255,255,.3); padding-top: 14px; }

/* ---------- 平台墙 ---------- */
.platforms-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.platform-card {
  background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 26px 24px; transition: transform .25s ease, box-shadow .25s ease;
  display: flex; flex-direction: column; gap: 10px;
}
.platform-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.platform-card .p-icon {
  width: 52px; height: 52px; border-radius: 14px; display: flex; align-items: center; justify-content: center;
  font-size: 24px; font-weight: 800; color: #fff;
}
.platform-card h3 { font-size: 19px; color: var(--deep); font-weight: 700; }
.platform-card p { color: var(--text-muted); font-size: 14.5px; flex: 1; }
.platform-card .p-link { color: var(--primary); font-weight: 600; font-size: 14.5px; }
.platform-card .p-link:hover { text-decoration: underline; }
.p-red { background: linear-gradient(135deg, #ff2e4d, #ff6b81); }
.p-blue { background: linear-gradient(135deg, #2932e1, #5a6bff); }
.p-green { background: linear-gradient(135deg, #00a862, #35d07f); }
.p-cyan { background: linear-gradient(135deg, #0077ff, #38bdf8); }
.p-black { background: linear-gradient(135deg, #111827, #4b5563); }
.p-purple { background: linear-gradient(135deg, #7c3aed, #a78bfa); }

/* ---------- 优势 ---------- */
.features-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.feature-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 26px 22px; }
.feature-card .f-icon {
  width: 48px; height: 48px; border-radius: 12px; display: flex; align-items: center; justify-content: center;
  font-size: 22px; margin-bottom: 16px; background: #eff6ff; color: var(--primary);
}
.feature-card h3 { font-size: 17px; font-weight: 700; color: var(--deep); margin-bottom: 8px; }
.feature-card p { font-size: 14px; color: var(--text-muted); }

/* ---------- 服务 ---------- */
.services-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.service-card {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 30px 26px;
  border-top: 4px solid var(--primary); transition: transform .25s ease, box-shadow .25s ease;
}
.service-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.service-card .s-num { font-size: 13px; font-weight: 700; color: var(--accent); letter-spacing: 2px; }
.service-card h3 { font-size: 19px; color: var(--deep); margin: 8px 0 10px; }
.service-card p { color: var(--text-muted); font-size: 14.5px; }

/* ---------- 流程 ---------- */
.process { background: var(--bg-soft); }
.process-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; counter-reset: step; }
.process-item { position: relative; background: #fff; border-radius: var(--radius); padding: 30px 22px 24px; text-align: center; }
.process-item::before {
  counter-increment: step; content: counter(step, decimal-leading-zero);
  font-size: 13px; font-weight: 800; color: var(--primary); background: #eff6ff;
  width: 40px; height: 40px; border-radius: 50%; display: inline-flex; align-items: center; justify-content: center;
  margin-bottom: 14px; font-family: "SF Mono", Menlo, monospace;
}
.process-item h3 { font-size: 17px; color: var(--deep); margin-bottom: 8px; }
.process-item p { font-size: 14px; color: var(--text-muted); }

/* ---------- FAQ ---------- */
.faq-list { max-width: 820px; margin: 0 auto; }
.faq-item { background: #fff; border: 1px solid var(--border); border-radius: 14px; margin-bottom: 14px; overflow: hidden; }
.faq-item summary {
  cursor: pointer; padding: 18px 22px; font-weight: 600; color: var(--deep); font-size: 16px;
  list-style: none; display: flex; justify-content: space-between; align-items: center; gap: 16px;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; font-size: 22px; color: var(--primary); font-weight: 400; transition: transform .25s; }
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-item .faq-a { padding: 0 22px 18px; color: var(--text-muted); font-size: 15px; }

/* ---------- 联系 ---------- */
.contact { background: var(--deep); color: #fff; }
.contact .section-head h2 { color: #fff; }
.contact .section-head p { color: #cbd5e1; }
.contact-wrap { display: grid; grid-template-columns: 1fr 1.1fr; gap: 44px; align-items: start; }
.contact-info h3 { font-size: 22px; font-weight: 700; margin-bottom: 18px; }
.contact-info .ci-item { display: flex; gap: 14px; margin-bottom: 22px; align-items: flex-start; }
.contact-info .ci-item .ci-ico {
  width: 42px; height: 42px; flex-shrink: 0; border-radius: 10px; background: rgba(255,255,255,.1);
  display: flex; align-items: center; justify-content: center; font-size: 19px;
}
.contact-info .ci-item b { display: block; font-size: 15px; margin-bottom: 2px; }
.contact-info .ci-item span { color: #cbd5e1; font-size: 14.5px; }
.contact-form {
  background: #fff; border-radius: 18px; padding: 30px; color: var(--text);
  box-shadow: var(--shadow-lg);
}
.contact-form h3 { font-size: 20px; color: var(--deep); margin-bottom: 20px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.form-group { margin-bottom: 14px; }
.form-group label { display: block; font-size: 13.5px; font-weight: 600; color: var(--deep-2); margin-bottom: 6px; }
.form-group input, .form-group select, .form-group textarea {
  width: 100%; padding: 12px 14px; border: 1.5px solid var(--border); border-radius: 10px;
  font-size: 15px; font-family: inherit; color: var(--text); background: #fff;
  transition: border-color .2s, box-shadow .2s; outline: none;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  border-color: var(--primary); box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}
.form-group textarea { resize: vertical; min-height: 90px; }
.form-tip { font-size: 12.5px; color: var(--text-muted); margin-top: 6px; }
.form-msg { display: none; padding: 12px 14px; border-radius: 10px; font-size: 14px; margin-bottom: 14px; }
.form-msg.ok { display: block; background: #ecfdf5; color: #047857; border: 1px solid #a7f3d0; }
.form-msg.err { display: block; background: #fef2f2; color: #b91c1c; border: 1px solid #fecaca; }

/* ---------- CTA 条 ---------- */
.cta-band { background: var(--grad); color: #fff; text-align: center; padding: 56px 0; }
.cta-band h2 { font-size: 30px; font-weight: 800; }
.cta-band p { color: #dbeafe; margin: 12px 0 26px; }

/* ---------- 页脚 ---------- */
.footer { background: var(--deep); color: #94a3b8; padding: 48px 0 0; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 32px; padding-bottom: 36px; }
.footer .f-logo { display: flex; align-items: center; gap: 10px; color: #fff; font-weight: 800; font-size: 19px; margin-bottom: 14px; }
.footer .f-about { font-size: 14px; line-height: 1.8; }
.footer h4 { color: #fff; font-size: 15px; margin-bottom: 14px; }
.footer ul li { margin-bottom: 10px; font-size: 14px; }
.footer ul a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.08); padding: 18px 0; text-align: center; font-size: 13px; }
.footer-bottom a { color: #94a3b8; }

/* ---------- 内页 Hero（平台落地页） ---------- */
.page-hero { background: var(--grad); color: #fff; padding: 76px 0 64px; position: relative; overflow: hidden; }
.page-hero::before {
  content: ""; position: absolute; inset: 0; opacity: .15;
  background-image: radial-gradient(circle at 25% 25%, #fff 1px, transparent 1px);
  background-size: 42px 42px; pointer-events: none;
}
.page-hero .container { position: relative; z-index: 1; display: grid; grid-template-columns: 1.2fr .8fr; gap: 40px; align-items: center; }
.page-hero .crumb { font-size: 13px; color: #bfdbfe; margin-bottom: 16px; }
.page-hero .crumb a:hover { color: #fff; }
.page-hero h1 { font-size: 38px; font-weight: 800; line-height: 1.35; }
.page-hero p { margin-top: 16px; color: #dbeafe; font-size: 16px; max-width: 600px; }
.page-hero .ph-badges { display: flex; gap: 12px; margin-top: 24px; flex-wrap: wrap; }
.page-hero .ph-badge {
  background: rgba(255,255,255,.16); border: 1px solid rgba(255,255,255,.3);
  padding: 7px 14px; border-radius: 999px; font-size: 13.5px;
}
.ph-card {
  background: rgba(255,255,255,.1); border: 1px solid rgba(255,255,255,.25);
  border-radius: 20px; padding: 24px; backdrop-filter: blur(8px);
}
.ph-card .ph-card-title { font-weight: 700; font-size: 16px; margin-bottom: 12px; }
.ph-card ul li { display: flex; gap: 10px; font-size: 14px; color: #dbeafe; margin-bottom: 10px; }
.ph-card ul li::before { content: "✓"; color: #34d399; font-weight: 700; flex-shrink: 0; }

/* ---------- 内页内容块 ---------- */
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 36px; align-items: start; }
.content-block h2 { font-size: 26px; color: var(--deep); margin-bottom: 16px; font-weight: 800; }
.content-block h3 { font-size: 18px; color: var(--deep); margin: 20px 0 10px; }
.content-block p { color: var(--text-muted); margin-bottom: 12px; }
.content-block ul li { position: relative; padding-left: 22px; color: var(--text-muted); margin-bottom: 10px; }
.content-block ul li::before { content: "•"; position: absolute; left: 6px; color: var(--primary); font-weight: 800; }
.docs-list { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.doc-item {
  background: #fff; border: 1px solid var(--border); border-radius: 12px; padding: 16px 18px;
  display: flex; align-items: center; gap: 12px; font-size: 14.5px; color: var(--deep-2); font-weight: 500;
}
.doc-item .d-ico { width: 36px; height: 36px; border-radius: 8px; background: #eff6ff; color: var(--primary); display: flex; align-items: center; justify-content: center; font-size: 17px; flex-shrink: 0; }
.notice-box {
  background: #fffbeb; border: 1px solid #fde68a; border-radius: 12px; padding: 16px 18px;
  color: #92400e; font-size: 14px; margin-top: 16px;
}

/* ---------- 动效 ---------- */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }

/* ---------- 响应式 ---------- */
@media (max-width: 992px) {
  .hero .container, .page-hero .container, .contact-wrap { grid-template-columns: 1fr; }
  .hero { padding: 64px 0 64px; }
  .hero h1 { font-size: 34px; }
  .platforms-grid, .services-grid { grid-template-columns: repeat(2, 1fr); }
  .features-grid, .process-grid { grid-template-columns: repeat(2, 1fr); }
  .two-col { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .nav {
    position: fixed; top: 68px; right: 0; left: 0; background: #fff; flex-direction: column;
    gap: 0; padding: 12px 20px 20px; box-shadow: var(--shadow); transform: translateY(-120%);
    transition: transform .3s ease; border-bottom: 1px solid var(--border); align-items: stretch;
  }
  .nav.open { transform: translateY(0); }
  .nav a { padding: 14px 4px; border-bottom: 1px solid #f1f5f9; }
  .nav .cta-btn { margin: 12px 0 0; }
  .menu-toggle { display: flex; }
  .section { padding: 56px 0; }
}
@media (max-width: 600px) {
  .hero h1 { font-size: 28px; }
  .section-head h2 { font-size: 25px; }
  .platforms-grid, .services-grid, .features-grid, .process-grid, .docs-list { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .cta-band h2 { font-size: 24px; }
}