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

:root {
  --bg-dark: #0b0f1a;
  --bg-dark2: #111827;
  --accent: #3b82f6;
  --accent-light: #60a5fa;
  --text-main: #1f2937;
  --text-sub: #6b7280;
  --white: #f9fafb;
  --border: #e5e7eb;
}

html { scroll-behavior: smooth; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  color: var(--text-main);
  background: #fff;
  line-height: 1.7;
}

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

a { color: inherit; text-decoration: none; }

/* ========== 导航 ========== */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  transition: background .3s, box-shadow .3s;
}
.navbar.scrolled {
  background: rgba(11, 15, 26, .92);
  backdrop-filter: blur(10px);
  box-shadow: 0 2px 20px rgba(0,0,0,.3);
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 72px;
}
.logo {
  color: #fff; font-size: 22px; font-weight: 700; letter-spacing: 1px;
}
.logo-mark { color: var(--accent-light); }
.nav-links a {
  color: rgba(255,255,255,.85); margin-left: 36px; font-size: 15px;
  transition: color .2s;
}
.nav-links a:hover { color: var(--accent-light); }
.menu-btn {
  display: none; background: none; border: none; color: #fff;
  font-size: 26px; cursor: pointer;
}

/* ========== Hero ========== */
.hero {
  position: relative; min-height: 100vh;
  display: flex; align-items: center;
  background: linear-gradient(135deg, #0b0f1a 0%, #16233f 55%, #1d3a6b 100%);
  overflow: hidden;
}
.hero::before {
  content: ""; position: absolute; inset: 0;
  background:
    radial-gradient(circle at 75% 30%, rgba(59,130,246,.25) 0%, transparent 45%),
    radial-gradient(circle at 20% 80%, rgba(96,165,250,.15) 0%, transparent 40%);
}
.hero-overlay {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.04) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
}
.hero-content { position: relative; z-index: 1; text-align: center; width: 100%; }
.hero-eyebrow {
  color: var(--accent-light); letter-spacing: 6px; font-size: 14px; margin-bottom: 20px;
}
.hero h1 {
  color: #fff; font-size: clamp(36px, 5.5vw, 64px); font-weight: 800;
  line-height: 1.25; letter-spacing: 2px; margin-bottom: 24px;
}
.hero-sub {
  color: rgba(255,255,255,.7); font-size: 18px; max-width: 640px; margin: 0 auto 40px;
}
.hero-btns { display: flex; gap: 20px; justify-content: center; flex-wrap: wrap; }

.btn {
  display: inline-block; padding: 14px 40px; border-radius: 6px;
  font-size: 16px; transition: all .25s; border: 1px solid transparent;
}
.btn-primary {
  background: var(--accent); color: #fff;
}
.btn-primary:hover { background: var(--accent-light); transform: translateY(-2px); }
.btn-ghost {
  border-color: rgba(255,255,255,.4); color: #fff;
}
.btn-ghost:hover { border-color: #fff; background: rgba(255,255,255,.08); }
.btn-block { width: 100%; }

/* ========== 数据 ========== */
.stats { background: #fff; padding: 70px 0; }
.stats-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; text-align: center;
}
.stat-num {
  font-size: 46px; font-weight: 800; color: var(--text-main);
}
.stat-num::after { content: attr(data-suffix); color: var(--accent); }
.stat-label { color: var(--text-sub); margin-top: 6px; font-size: 15px; }

/* ========== 通用 Section ========== */
.section { padding: 100px 0; }
.section-dark { background: var(--bg-dark); }
.section-head { text-align: center; margin-bottom: 60px; }
.section-eyebrow { color: var(--accent-light); letter-spacing: 4px; font-size: 13px; }
.section-dark .section-head h2 { color: #fff; }
.section h2 { font-size: 36px; margin: 8px 0; }
.section-line {
  width: 56px; height: 3px; background: var(--accent); margin: 14px auto 0; border-radius: 2px;
}

/* ========== 关于 ========== */
.about-grid {
  display: grid; grid-template-columns: 1.1fr .9fr; gap: 60px; align-items: start;
}
.about-text h3 { font-size: 24px; margin-bottom: 20px; }
.about-text p { color: var(--text-sub); margin-bottom: 16px; text-align: justify; }
.about-values { display: flex; flex-direction: column; gap: 22px; }
.value-item {
  display: flex; gap: 18px; padding: 24px;
  border: 1px solid var(--border); border-radius: 10px;
  transition: box-shadow .25s, transform .25s;
}
.value-item:hover { box-shadow: 0 8px 30px rgba(0,0,0,.08); transform: translateY(-3px); }
.value-icon { font-size: 26px; color: var(--accent); }
.value-item h4 { font-size: 17px; margin-bottom: 4px; }
.value-item p { color: var(--text-sub); font-size: 14px; }

/* ========== 业务卡片 ========== */
.cards-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px;
}
.card {
  background: var(--bg-dark2); border: 1px solid rgba(255,255,255,.08);
  border-radius: 12px; padding: 38px 30px;
  transition: transform .25s, border-color .25s, box-shadow .25s;
}
.card:hover {
  transform: translateY(-6px); border-color: rgba(96,165,250,.5);
  box-shadow: 0 14px 40px rgba(0,0,0,.4);
}
.card-icon {
  width: 52px; height: 52px; border-radius: 10px;
  background: rgba(59,130,246,.15); color: var(--accent-light);
  display: flex; align-items: center; justify-content: center;
  font-size: 24px; margin-bottom: 20px;
}
.card h3 { color: #fff; font-size: 19px; margin-bottom: 12px; }
.card p { color: rgba(255,255,255,.6); font-size: 14px; }

/* ========== 优势 ========== */
.adv-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 26px;
}
.adv-item {
  padding: 32px 26px; border: 1px solid var(--border); border-radius: 10px;
  transition: transform .25s, box-shadow .25s;
}
.adv-item:hover { transform: translateY(-5px); box-shadow: 0 10px 30px rgba(0,0,0,.08); }
.adv-num {
  font-size: 34px; font-weight: 800; color: transparent;
  -webkit-text-stroke: 1.5px var(--accent); margin-bottom: 14px;
}
.adv-item h3 { font-size: 18px; margin-bottom: 10px; }
.adv-item p { color: var(--text-sub); font-size: 14px; }

/* ========== 联系 ========== */
.contact-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 60px;
}
.contact-item { margin-bottom: 28px; }
.contact-item strong {
  color: var(--accent-light); display: block; font-size: 15px; margin-bottom: 6px;
}
.contact-item p { color: rgba(255,255,255,.75); }
.contact-form input, .contact-form textarea {
  width: 100%; padding: 14px 16px; margin-bottom: 16px;
  background: var(--bg-dark2); border: 1px solid rgba(255,255,255,.12);
  border-radius: 6px; color: #fff; font-size: 15px; font-family: inherit;
  outline: none; transition: border-color .2s;
}
.contact-form input:focus, .contact-form textarea:focus {
  border-color: var(--accent);
}
.form-tip { color: var(--accent-light); font-size: 14px; margin-top: 12px; min-height: 20px; }

/* ========== 页脚 ========== */
.footer {
  background: #070a12; color: rgba(255,255,255,.55);
  padding: 50px 0 30px; font-size: 13px;
}
.footer-inner { text-align: center; }
.footer-brand { color: #fff; font-size: 17px; font-weight: 600; margin-bottom: 18px; }
.footer-info p, .footer-beian p { margin: 6px 0; }
.footer-links { margin: 16px 0; }
.footer-links a:hover { color: var(--accent-light); }
.footer-beian {
  border-top: 1px solid rgba(255,255,255,.08); margin-top: 20px; padding-top: 20px;
}
.footer-beian a { color: rgba(255,255,255,.55); }
.footer-beian a:hover { color: var(--accent-light); }
.footer-beian img {
  width: 16px; height: 16px; vertical-align: -3px; margin-right: 4px;
  filter: invert(.7);
}

/* ========== 滚动动画 ========== */
.reveal {
  opacity: 0; transform: translateY(28px);
  transition: opacity .7s ease, transform .7s ease;
}
.reveal.visible { opacity: 1; transform: none; }

/* ========== 响应式 ========== */
@media (max-width: 992px) {
  .cards-grid, .adv-grid { grid-template-columns: repeat(2, 1fr); }
  .about-grid, .contact-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 40px; }
}
@media (max-width: 640px) {
  .nav-links {
    position: absolute; top: 72px; left: 0; right: 0;
    background: rgba(11,15,26,.97); flex-direction: column;
    display: none; padding: 20px 24px;
  }
  .nav-links.open { display: flex; }
  .nav-links a { display: block; margin: 12px 0; }
  .menu-btn { display: block; }
  .cards-grid, .adv-grid { grid-template-columns: 1fr; }
  .section { padding: 70px 0; }
}