:root {
  --red: #E1251B;
  --red-dark: #B81C14;
  --ink: #1F2329;
  --gray: #8F959E;
  --line: #E5E6EB;
  --bg: #FFFFFF;
  --bg-alt: #F5F6F8;
  --card: #FFFFFF;
  --shadow: 0 2px 12px rgba(31, 35, 41, 0.06);
  --shadow-hover: 0 6px 24px rgba(31, 35, 41, 0.10);
  --radius: 12px;
  --maxw: 1120px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
.hl { color: var(--red); }

/* 按钮 */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 12px 24px; border-radius: 8px; font-size: 15px; font-weight: 600;
  cursor: pointer; border: 1px solid transparent; transition: all .2s ease;
}
.btn-primary { background: var(--red); color: #fff; }
.btn-primary:hover { background: var(--red-dark); transform: translateY(-1px); }
.btn-ghost { background: #fff; color: var(--ink); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--red); color: var(--red); }
.btn-sm { padding: 8px 18px; font-size: 14px; }
.btn-block { width: 100%; padding: 14px; font-size: 16px; }

/* 导航 */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,0.92); backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  max-width: var(--maxw); margin: 0 auto; padding: 12px 20px;
  display: flex; align-items: center; gap: 24px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; }
.brand-mark {
  width: 32px; height: 32px; border-radius: 8px; background: var(--red); color: #fff;
  display: grid; place-items: center; font-size: 18px; font-weight: 700;
}
.brand-name { font-size: 18px; letter-spacing: .5px; }
.nav-links { display: flex; gap: 26px; margin-left: auto; font-size: 15px; color: #4E5969; }
.nav-links a:hover { color: var(--red); }

/* Hero */
.hero { background: linear-gradient(180deg, #FFF6F5 0%, #FFFFFF 100%); padding: 64px 20px 72px; }
.hero-inner {
  max-width: var(--maxw); margin: 0 auto; display: grid; grid-template-columns: 1.2fr 1fr; gap: 48px; align-items: center;
}
.badge {
  display: inline-block; background: #FCE8E6; color: var(--red);
  font-size: 13px; font-weight: 600; padding: 5px 12px; border-radius: 20px; margin-bottom: 18px;
}
.hero h1 { font-size: 42px; line-height: 1.25; font-weight: 800; letter-spacing: .5px; }
.hero .sub { color: #4E5969; font-size: 17px; margin: 18px 0 28px; max-width: 520px; }
.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 28px;
}
.stat-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px 16px; }
.stat .num { font-size: 32px; font-weight: 800; color: var(--red); }
.stat .num .u { font-size: 18px; font-weight: 700; }
.stat .lbl { color: var(--gray); font-size: 14px; margin-top: 2px; }
.hero-card-foot { margin-top: 18px; padding-top: 16px; border-top: 1px dashed var(--line); color: var(--gray); font-size: 13px; text-align: center; }

/* 区块 */
.section { max-width: var(--maxw); margin: 0 auto; padding: 72px 20px; }
.section-alt { max-width: none; background: var(--bg-alt); }
.section-alt > * { max-width: var(--maxw); margin-left: auto; margin-right: auto; }
.section-head { text-align: center; margin-bottom: 44px; }
.section-head h2 { font-size: 30px; font-weight: 800; }
.section-head p { color: var(--gray); margin-top: 8px; font-size: 16px; }

/* 业务卡片 */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px; box-shadow: var(--shadow); transition: all .2s ease;
}
.card:hover { box-shadow: var(--shadow-hover); transform: translateY(-3px); border-color: #FBCFCB; }
.card-ico { font-size: 30px; margin-bottom: 12px; }
.card h3 { font-size: 18px; margin-bottom: 8px; }
.card p { color: #4E5969; font-size: 14.5px; }

/* 流程 */
.steps { display: grid; grid-template-columns: repeat(5, 1fr); gap: 16px; }
.step {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px 16px; text-align: center; box-shadow: var(--shadow);
}
.step-no {
  width: 40px; height: 40px; border-radius: 50%; background: var(--red); color: #fff;
  display: grid; place-items: center; font-weight: 700; font-size: 18px; margin: 0 auto 14px;
}
.step h3 { font-size: 16px; margin-bottom: 6px; }
.step p { color: var(--gray); font-size: 13.5px; }

/* 优势 */
.adv { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.adv-item { text-align: center; padding: 20px; }
.adv-ico { font-size: 32px; margin-bottom: 10px; }
.adv-item h3 { font-size: 17px; margin-bottom: 6px; }
.adv-item p { color: var(--gray); font-size: 14px; }

/* 关于 */
.about-inner { display: grid; grid-template-columns: 1.4fr 1fr; gap: 48px; align-items: center; }
.about-text h2 { font-size: 28px; font-weight: 800; margin-bottom: 16px; }
.about-text p { color: #4E5969; margin-bottom: 12px; }
.about-list { list-style: none; margin-top: 16px; }
.about-list li { color: #4E5969; margin-bottom: 8px; font-size: 15px; }
.about-card {
  background: var(--red); color: #fff; border-radius: var(--radius); padding: 40px 28px; text-align: center;
  box-shadow: 0 8px 28px rgba(225,37,27,0.25);
}
.about-logo { font-size: 30px; font-weight: 800; letter-spacing: 2px; }
.about-meta { margin-top: 12px; opacity: .92; font-size: 14px; }

/* 联系 / 表单 */
.contact { background: var(--bg-alt); max-width: none; }
.contact > .section-head { max-width: var(--maxw); margin-left: auto; margin-right: auto; }
.contact-wrap {
  max-width: var(--maxw); margin: 0 auto; display: grid; grid-template-columns: 1.5fr 1fr; gap: 28px;
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 32px;
}
.lead-form { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.field { display: flex; flex-direction: column; }
.field-full { grid-column: 1 / -1; }
.field label { font-size: 14px; font-weight: 600; margin-bottom: 7px; }
.req { color: var(--red); }
.field input, .field select, .field textarea {
  border: 1px solid var(--line); border-radius: 8px; padding: 11px 13px; font-size: 15px;
  font-family: inherit; color: var(--ink); background: #fff; transition: border-color .2s ease;
}
.field input:focus, .field select:focus, .field textarea:focus { outline: none; border-color: var(--red); }
.field textarea { resize: vertical; }
.err { color: var(--red); font-size: 12.5px; margin-top: 5px; min-height: 16px; }
.form-tip { color: var(--gray); font-size: 13px; margin-top: 10px; text-align: center; }

.contact-side { display: flex; flex-direction: column; gap: 14px; }
.side-card {
  display: flex; align-items: center; gap: 14px; background: var(--bg-alt);
  border: 1px solid var(--line); border-radius: 10px; padding: 16px;
}
.side-ico { font-size: 24px; }
.side-lbl { color: var(--gray); font-size: 13px; }
.side-val { font-size: 17px; font-weight: 700; }
.side-note { color: var(--gray); font-size: 13px; margin-top: 4px; text-align: center; }

/* Toast */
.toast {
  position: fixed; left: 50%; bottom: 40px; transform: translateX(-50%) translateY(20px);
  background: var(--ink); color: #fff; padding: 14px 26px; border-radius: 10px; font-size: 15px;
  opacity: 0; pointer-events: none; transition: all .3s ease; z-index: 100; max-width: 90vw;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast.ok { background: #1AAC5B; }
.toast.err { background: var(--red); }

/* 页脚 */
.footer { background: #1F2329; color: #C9CDD4; padding: 32px 20px; }
.footer-inner { max-width: var(--maxw); margin: 0 auto; text-align: center; }
.footer-brand { font-weight: 700; color: #fff; margin-bottom: 8px; }
.footer-meta { font-size: 13px; color: #8F959E; }

/* 响应式 */
@media (max-width: 880px) {
  .hero-inner { grid-template-columns: 1fr; gap: 32px; }
  .hero h1 { font-size: 32px; }
  .cards { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .adv { grid-template-columns: repeat(2, 1fr); }
  .about-inner { grid-template-columns: 1fr; gap: 28px; }
  .contact-wrap { grid-template-columns: 1fr; }
  .nav-links { display: none; }
}
@media (max-width: 560px) {
  .cards, .steps, .adv { grid-template-columns: 1fr; }
  .lead-form { grid-template-columns: 1fr; }
  .hero h1 { font-size: 28px; }
  .section { padding: 52px 16px; }
}