/* 算数-广告印匠 介绍站样式 */
:root {
  --deep: #15324f;
  --deep-2: #10395c;
  --accent: #e8792b;
  --accent-soft: #fff4ec;
  --text: #1f2937;
  --muted: #64748b;
  --line: #e5e7eb;
  --bg: #f6f8fb;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
  font-size: 15px;
  line-height: 1.75;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.wrap { width: min(1180px, 92vw); margin: 0 auto; }

/* 顶栏 */
.site-header {
  position: sticky; top: 0; z-index: 30;
  background: rgba(21, 50, 79, .96);
  backdrop-filter: blur(6px);
  color: #fff;
}
.site-header .bar { display: flex; align-items: center; gap: 26px; height: 62px; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 17px; letter-spacing: .3px; }
.logo-mark {
  width: 32px; height: 32px; border-radius: 9px; flex: none;
  background: linear-gradient(135deg, var(--accent), #f6a55f);
  display: grid; place-items: center; font-size: 15px; font-weight: 900; color: #fff;
}
.nav { display: flex; gap: 22px; margin-left: auto; font-size: 14px; }
.nav a { color: rgba(255, 255, 255, .82); padding: 4px 0; border-bottom: 2px solid transparent; }
.nav a:hover, .nav a.active { color: #fff; border-color: var(--accent); }
.nav-cta {
  padding: 8px 16px; border-radius: 9px; background: var(--accent); color: #fff !important;
  font-size: 13px; font-weight: 700; border-bottom: 0 !important;
}
.menu-btn { display: none; margin-left: auto; background: none; border: 0; color: #fff; font-size: 22px; }

/* 首屏 */
.hero {
  background:
    radial-gradient(1100px 380px at 88% -8%, rgba(232, 121, 43, .30), transparent 62%),
    linear-gradient(150deg, var(--deep) 0%, #0d2a44 62%, #081f33 100%);
  color: #fff; padding: 74px 0 66px;
}
.hero-grid { display: grid; grid-template-columns: 1.08fr .92fr; gap: 46px; align-items: center; }
.tag {
  display: inline-flex; align-items: center; gap: 8px; font-size: 13px;
  padding: 6px 14px; border-radius: 999px; margin-bottom: 18px;
  background: rgba(255, 255, 255, .12); border: 1px solid rgba(255, 255, 255, .2);
}
.tag i { width: 7px; height: 7px; border-radius: 50%; background: var(--accent); font-style: normal; }
.hero h1 { font-size: 40px; line-height: 1.26; margin: 0 0 16px; letter-spacing: .5px; }
.hero h1 em { font-style: normal; color: #f9b47a; }
.hero p.lead { font-size: 16px; color: rgba(255, 255, 255, .82); margin: 0 0 26px; max-width: 560px; }
.hero-ops { display: flex; gap: 12px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 8px; padding: 12px 22px; border-radius: 10px;
  font-weight: 700; font-size: 14px; border: 1px solid transparent; cursor: pointer;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: #f38b3c; }
.btn-ghost { border-color: rgba(255, 255, 255, .35); color: #fff; }
.btn-ghost:hover { background: rgba(255, 255, 255, .12); }
.hero-meta { margin-top: 26px; display: flex; gap: 26px; flex-wrap: wrap; font-size: 13px; color: rgba(255, 255, 255, .68); }
.hero-meta b { display: block; font-size: 22px; color: #fff; font-weight: 800; }

/* 成本卡片模拟 */
.calc-card {
  background: #fff; color: var(--text); border-radius: 16px; padding: 20px;
  box-shadow: 0 24px 60px rgba(4, 20, 35, .38);
}
.calc-card h3 { margin: 0 0 4px; font-size: 15px; color: var(--deep); }
.calc-card .sub { font-size: 12px; color: var(--muted); margin-bottom: 14px; }
.calc-row { display: flex; align-items: center; justify-content: space-between; gap: 10px; font-size: 13px; padding: 8px 0; border-bottom: 1px dashed var(--line); }
.calc-row span:first-child { color: #475569; }
.calc-row b { color: var(--deep); }
.calc-total { display: flex; align-items: baseline; justify-content: space-between; margin-top: 14px; }
.calc-total span { font-size: 13px; color: var(--muted); }
.calc-total strong { font-size: 28px; color: var(--accent); }
.tier { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin-top: 14px; }
.tier div { border: 1px solid var(--line); border-radius: 10px; padding: 9px 10px; text-align: center; }
.tier b { display: block; font-size: 15px; color: var(--deep); }
.tier span { font-size: 11px; color: var(--muted); }

/* 通用区块 */
section { padding: 62px 0; }
.sec-head { text-align: center; max-width: 760px; margin: 0 auto 38px; }
.sec-head h2 { font-size: 28px; margin: 0 0 12px; color: var(--deep); }
.sec-head p { color: var(--muted); margin: 0; }
.sec-kicker { font-size: 13px; color: var(--accent); font-weight: 800; letter-spacing: 1.6px; text-transform: uppercase; }
.alt { background: #fff; }

.grid-3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 18px; }
.grid-4 { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 16px; }
.card {
  background: #fff; border: 1px solid var(--line); border-radius: 14px; padding: 20px;
  transition: transform .18s, box-shadow .18s, border-color .18s;
}
.alt .card { background: #fbfdff; }
.card:hover { transform: translateY(-3px); box-shadow: 0 14px 34px rgba(21, 50, 79, .10); border-color: #f0c8a6; }
.card .ico {
  width: 38px; height: 38px; border-radius: 10px; display: grid; place-items: center;
  background: var(--accent-soft); color: var(--accent); font-weight: 900; margin-bottom: 12px; font-size: 16px;
}
.card h3 { margin: 0 0 8px; font-size: 16px; color: var(--deep); }
.card p { margin: 0; font-size: 14px; color: #475569; }
.card ul { margin: 10px 0 0; padding-left: 18px; font-size: 13.5px; color: #475569; }
.card ul li { margin-bottom: 4px; }

/* 流程 */
.flow { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 14px; }
.flow-step { position: relative; background: #fff; border: 1px solid var(--line); border-radius: 14px; padding: 18px; }
.flow-step .idx {
  position: absolute; top: -12px; left: 18px; width: 26px; height: 26px; border-radius: 8px;
  background: var(--deep); color: #fff; font-size: 12px; font-weight: 800; display: grid; place-items: center;
}
.flow-step h3 { margin: 8px 0 6px; font-size: 15px; color: var(--deep); }
.flow-step p { margin: 0; font-size: 13px; color: #475569; }
.flow-step em { display: block; margin-top: 8px; font-style: normal; font-size: 12px; color: var(--accent); font-weight: 700; }

/* 表格 */
.table-wrap { overflow: auto; border: 1px solid var(--line); border-radius: 14px; background: #fff; }
table { border-collapse: collapse; width: 100%; font-size: 13.5px; }
th, td { padding: 11px 14px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
th { background: #f1f5f9; color: var(--deep); font-weight: 700; white-space: nowrap; }
tbody tr:last-child td { border-bottom: 0; }

/* 角色卡 */
.role-card { background: #fff; border: 1px solid var(--line); border-left: 4px solid var(--accent); border-radius: 12px; padding: 18px; }
.role-card h3 { margin: 0 0 4px; color: var(--deep); font-size: 16px; }
.role-card .scope { font-size: 12px; color: var(--accent); font-weight: 700; margin-bottom: 8px; display: block; }
.role-card p { margin: 0; font-size: 13.5px; color: #475569; }

/* CTA */
.cta {
  background: linear-gradient(135deg, var(--deep), #0b2740); color: #fff;
  border-radius: 18px; padding: 44px; text-align: center;
}
.cta h2 { margin: 0 0 10px; font-size: 26px; }
.cta p { color: rgba(255, 255, 255, .78); margin: 0 0 22px; }
.cta .hero-ops { justify-content: center; }

/* 页脚 */
.site-footer { background: #0d2439; color: rgba(255, 255, 255, .7); padding: 40px 0 26px; font-size: 13px; }
.foot-grid { display: grid; grid-template-columns: 1.5fr .85fr .85fr 1.1fr; gap: 26px; }
.site-footer h4 { color: #fff; font-size: 14px; margin: 0 0 10px; }
.site-footer a { display: block; padding: 3px 0; }
.site-footer a:hover { color: var(--accent); }
.copy { border-top: 1px solid rgba(255, 255, 255, .12); margin-top: 26px; padding-top: 16px; display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.copy a { display: inline; padding: 0; color: #f9b47a; }
.copy a:hover { color: #fff; text-decoration: underline; }

/* 商务联系 + 企业微信二维码 */
.foot-contact .contact-tel { font-size: 17px; font-weight: 800; color: #fff; letter-spacing: .4px; padding: 2px 0 6px; }
.foot-contact .contact-tel span { font-size: 12px; font-weight: 600; color: rgba(255, 255, 255, .62); margin-left: 4px; }
.foot-contact .contact-tel:hover span, .foot-contact .contact-tel:hover { color: #f9b47a; }
.qr-card { margin-top: 10px; display: inline-flex; flex-direction: column; align-items: center; gap: 6px; padding: 8px; border-radius: 12px; background: rgba(255, 255, 255, .96); }
.qr-card img { width: 104px; height: 104px; border-radius: 8px; background: #fff; }
.qr-card span { font-size: 11px; color: #334155; }

/* 演示水印（与系统内水印同一文案） */
.site-watermark {
  position: fixed; inset: 0; z-index: 40; pointer-events: none; overflow: hidden; user-select: none;
}
.site-watermark i {
  position: absolute; font-style: normal; white-space: nowrap;
  font-size: 13px; font-weight: 600; letter-spacing: .5px; color: #1a4a6e;
}

@media (max-width: 980px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero h1 { font-size: 30px; }
  .foot-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  .nav { position: absolute; top: 62px; left: 0; right: 0; flex-direction: column; gap: 0; background: var(--deep); padding: 8px 0; display: none; }
  .nav.open { display: flex; }
  .nav a { padding: 12px 6vw; border-bottom: 1px solid rgba(255, 255, 255, .08); }
  .nav-cta { margin: 10px 6vw; text-align: center; }
  .menu-btn { display: block; }
  section { padding: 44px 0; }
  .cta { padding: 30px 20px; }
  .foot-grid { grid-template-columns: 1fr; }
}