/* ============================================================
   传动精工官网 - 全站样式
   配色：工业蓝(信赖/精密) + 工程橙(能量/警示) + 钢灰中性色
   ============================================================ */

:root {
  /* 主色 - 工业蓝 */
  --color-primary: #0a3d7a;
  --color-primary-dark: #062a56;
  --color-primary-light: #1a5aa8;
  /* 强调色 - 工程橙 */
  --color-accent: #ff6b00;
  --color-accent-dark: #e05c00;
  /* 中性钢灰 */
  --color-dark: #1a2332;
  --color-gray-900: #2b3444;
  --color-gray-700: #4a5568;
  --color-gray-500: #718096;
  --color-gray-300: #cbd5e0;
  --color-gray-100: #edf1f7;
  --color-gray-50: #f7f9fc;
  --color-white: #ffffff;
  /* 功能色 */
  --color-success: #2f855a;
  /* 阴影 */
  --shadow-sm: 0 1px 3px rgba(10, 61, 122, 0.08);
  --shadow-md: 0 4px 16px rgba(10, 61, 122, 0.10);
  --shadow-lg: 0 12px 32px rgba(10, 61, 122, 0.14);
  /* 尺寸 */
  --max-width: 1200px;
  --radius: 8px;
  --radius-lg: 14px;
  --transition: 0.28s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
  color: var(--color-gray-900);
  line-height: 1.7;
  background: var(--color-white);
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
ul { list-style: none; }

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

/* ---------- 通用标题 ---------- */
.section { padding: 84px 0; }
.section--gray { background: var(--color-gray-50); }

.section-head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 56px;
}
.section-head .eyebrow {
  display: inline-block;
  color: var(--color-accent);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 12px;
}
.section-head h2 {
  font-size: clamp(26px, 4vw, 38px);
  color: var(--color-primary);
  font-weight: 800;
  line-height: 1.3;
}
.section-head p {
  margin-top: 16px;
  color: var(--color-gray-700);
  font-size: 17px;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 30px;
  border-radius: var(--radius);
  font-weight: 700;
  font-size: 16px;
  cursor: pointer;
  border: 2px solid transparent;
  transition: var(--transition);
  white-space: nowrap;
}
.btn--primary { background: var(--color-accent); color: #fff; }
.btn--primary:hover { background: var(--color-accent-dark); transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn--outline { background: transparent; color: #fff; border-color: rgba(255,255,255,0.7); }
.btn--outline:hover { background: #fff; color: var(--color-primary); }
.btn--blue { background: var(--color-primary); color: #fff; }
.btn--blue:hover { background: var(--color-primary-dark); transform: translateY(-2px); box-shadow: var(--shadow-md); }

/* ============================================================
   顶部导航
   ============================================================ */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(8px);
  box-shadow: var(--shadow-sm);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 74px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 11px;
  font-weight: 800;
  font-size: 21px;
  color: var(--color-primary);
}
.logo__mark {
  width: 40px; height: 40px;
  flex-shrink: 0;
}
.logo__sub { font-size: 11px; color: var(--color-gray-500); font-weight: 600; letter-spacing: 1px; }

.nav-menu { display: flex; align-items: center; gap: 6px; }
.nav-menu a {
  padding: 8px 16px;
  font-weight: 600;
  color: var(--color-gray-900);
  border-radius: var(--radius);
  transition: var(--transition);
}
.nav-menu a:hover, .nav-menu a.active { color: var(--color-primary); background: var(--color-gray-100); }

.nav-cta { display: flex; align-items: center; gap: 16px; }
.nav-phone { display: flex; align-items: center; gap: 7px; color: var(--color-primary); font-weight: 700; }
.nav-phone svg { color: var(--color-accent); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none; border: none; cursor: pointer;
  padding: 8px;
}
.nav-toggle span { width: 26px; height: 3px; background: var(--color-primary); border-radius: 2px; transition: var(--transition); }

/* ============================================================
   Hero
   ============================================================ */
.hero {
  position: relative;
  color: #fff;
  background:
    linear-gradient(135deg, rgba(6,42,86,0.94) 0%, rgba(10,61,122,0.88) 55%, rgba(26,90,168,0.82) 100%),
    url("../images/hero.svg") center/cover no-repeat;
  overflow: hidden;
}
.hero__inner {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 48px;
  align-items: center;
  padding: 96px 0 100px;
}
.hero__content .eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(255,255,255,0.12);
  border: 1px solid rgba(255,255,255,0.25);
  padding: 7px 16px; border-radius: 40px;
  font-size: 14px; font-weight: 600; letter-spacing: 1px;
  margin-bottom: 22px;
}
.hero__content .eyebrow::before { content: ""; width: 8px; height: 8px; background: var(--color-accent); border-radius: 50%; }
.hero h1 {
  font-size: clamp(30px, 5vw, 50px);
  line-height: 1.2;
  font-weight: 800;
  margin-bottom: 20px;
}
.hero h1 .hl { color: #ffc48a; }
.hero__desc { font-size: 18px; color: rgba(255,255,255,0.9); margin-bottom: 34px; max-width: 560px; }
.hero__actions { display: flex; gap: 16px; flex-wrap: wrap; }

.hero__stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.stat-card {
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: var(--radius-lg);
  padding: 26px 24px;
  backdrop-filter: blur(4px);
}
.stat-card .num { font-size: 38px; font-weight: 800; color: #ffc48a; line-height: 1; }
.stat-card .num small { font-size: 20px; }
.stat-card .label { margin-top: 8px; font-size: 15px; color: rgba(255,255,255,0.85); }

/* ---------- 客户信赖条 ---------- */
.trust-bar { background: var(--color-gray-50); border-bottom: 1px solid var(--color-gray-100); padding: 26px 0; }
.trust-bar__inner { display: flex; align-items: center; justify-content: center; gap: 40px; flex-wrap: wrap; }
.trust-bar__label { color: var(--color-gray-500); font-size: 14px; font-weight: 600; }
.trust-logos { display: flex; gap: 36px; flex-wrap: wrap; align-items: center; }
.trust-logos span { color: var(--color-gray-500); font-weight: 700; font-size: 17px; opacity: 0.7; }

/* ============================================================
   核心优势
   ============================================================ */
.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.feature-card {
  background: #fff;
  border: 1px solid var(--color-gray-100);
  border-radius: var(--radius-lg);
  padding: 34px 28px;
  transition: var(--transition);
}
.feature-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: transparent; }
.feature-card__icon {
  width: 56px; height: 56px;
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: #fff; border-radius: 14px; margin-bottom: 20px;
}
.feature-card h3 { font-size: 19px; color: var(--color-primary); margin-bottom: 10px; }
.feature-card p { color: var(--color-gray-700); font-size: 15px; }

/* ============================================================
   产品卡片
   ============================================================ */
.products-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}
.product-card {
  display: flex;
  background: #fff;
  border: 1px solid var(--color-gray-100);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition);
}
.product-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-4px); }
.product-card__media {
  width: 190px; flex-shrink: 0;
  background: linear-gradient(135deg, var(--color-gray-100), #dbe5f0);
  display: flex; align-items: center; justify-content: center;
  color: var(--color-primary);
}
.product-card__body { padding: 28px; }
.product-card__tag {
  display: inline-block; font-size: 12px; font-weight: 700;
  color: var(--color-accent); background: #fff3e8;
  padding: 4px 12px; border-radius: 20px; margin-bottom: 12px;
}
.product-card h3 { font-size: 21px; color: var(--color-primary); margin-bottom: 10px; }
.product-card p { color: var(--color-gray-700); font-size: 15px; margin-bottom: 16px; }
.product-card__specs { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 18px; }
.product-card__specs li {
  font-size: 13px; color: var(--color-gray-700);
  background: var(--color-gray-50); border: 1px solid var(--color-gray-100);
  padding: 4px 12px; border-radius: 6px;
}
.product-card__link { color: var(--color-primary); font-weight: 700; display: inline-flex; align-items: center; gap: 6px; }
.product-card__link:hover { color: var(--color-accent); gap: 10px; }

/* ============================================================
   应用领域
   ============================================================ */
.apps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}
.app-card {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  min-height: 320px;
  display: flex; flex-direction: column; justify-content: flex-end;
  color: #fff;
  padding: 30px;
  background: var(--color-primary);
  transition: var(--transition);
}
.app-card::before {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(6,42,86,0.15) 0%, rgba(6,42,86,0.55) 55%, rgba(6,42,86,0.92) 100%);
  z-index: 1;
}
.app-card__bg { position: absolute; inset: 0; z-index: 0; opacity: 0.9; }
.app-card > * { position: relative; z-index: 2; }
.app-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.app-card__icon { width: 48px; height: 48px; margin-bottom: 16px; color: #ffc48a; }
.app-card h3 { font-size: 22px; margin-bottom: 10px; }
.app-card p { font-size: 15px; color: rgba(255,255,255,0.9); margin-bottom: 14px; }
.app-card__tags { display: flex; flex-wrap: wrap; gap: 8px; }
.app-card__tags span { font-size: 12px; background: rgba(255,255,255,0.18); padding: 3px 10px; border-radius: 14px; }

/* ============================================================
   CTA 区块
   ============================================================ */
.cta-band {
  background: linear-gradient(120deg, var(--color-primary-dark), var(--color-primary-light));
  color: #fff;
  border-radius: 20px;
  padding: 54px;
  display: flex; align-items: center; justify-content: space-between;
  gap: 30px; flex-wrap: wrap;
  position: relative; overflow: hidden;
}
.cta-band::after {
  content: ""; position: absolute; right: -60px; top: -60px;
  width: 240px; height: 240px; border-radius: 50%;
  background: rgba(255,107,0,0.18);
}
.cta-band__text { position: relative; z-index: 2; }
.cta-band h2 { font-size: 30px; margin-bottom: 8px; }
.cta-band p { color: rgba(255,255,255,0.9); font-size: 17px; }
.cta-band .btn { position: relative; z-index: 2; }

/* ============================================================
   页脚
   ============================================================ */
.footer { background: var(--color-dark); color: rgba(255,255,255,0.75); padding: 64px 0 0; }
.footer__grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1.3fr;
  gap: 40px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.footer__brand .logo { color: #fff; margin-bottom: 16px; }
.footer__brand p { font-size: 14px; line-height: 1.8; max-width: 320px; }
.footer h4 { color: #fff; font-size: 16px; margin-bottom: 18px; }
.footer ul li { margin-bottom: 11px; }
.footer ul li a { font-size: 14px; transition: var(--transition); }
.footer ul li a:hover { color: var(--color-accent); }
.footer__contact li { display: flex; gap: 10px; font-size: 14px; margin-bottom: 14px; align-items: flex-start; }
.footer__contact svg { color: var(--color-accent); flex-shrink: 0; margin-top: 3px; }
.footer__bottom {
  padding: 22px 0;
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px;
  font-size: 13px; color: rgba(255,255,255,0.5);
}
.footer__bottom a:hover { color: var(--color-accent); }

/* ============================================================
   内页通用 - 页面横幅
   ============================================================ */
.page-hero {
  background: linear-gradient(120deg, var(--color-primary-dark), var(--color-primary));
  color: #fff;
  padding: 66px 0;
  text-align: center;
}
.page-hero h1 { font-size: clamp(28px, 4vw, 42px); font-weight: 800; margin-bottom: 14px; }
.page-hero p { font-size: 17px; color: rgba(255,255,255,0.9); max-width: 680px; margin: 0 auto; }
.breadcrumb { padding: 18px 0; font-size: 14px; color: var(--color-gray-500); background: var(--color-gray-50); }
.breadcrumb a:hover { color: var(--color-primary); }
.breadcrumb .sep { margin: 0 8px; }

/* ---------- 产品详细列表 ---------- */
.prod-detail {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 32px;
  align-items: start;
  padding: 44px;
  background: #fff;
  border: 1px solid var(--color-gray-100);
  border-radius: var(--radius-lg);
  margin-bottom: 32px;
  scroll-margin-top: 100px;
}
.prod-detail__media {
  background: linear-gradient(135deg, var(--color-gray-100), #dbe5f0);
  border-radius: var(--radius);
  aspect-ratio: 4/3;
  display: flex; align-items: center; justify-content: center;
  color: var(--color-primary);
}
.prod-detail h2 { color: var(--color-primary); font-size: 26px; margin-bottom: 8px; }
.prod-detail__lead { color: var(--color-gray-700); margin-bottom: 22px; }
.prod-detail h4 { color: var(--color-gray-900); font-size: 16px; margin: 20px 0 12px; display: flex; align-items: center; gap: 8px; }
.prod-detail h4::before { content: ""; width: 4px; height: 16px; background: var(--color-accent); border-radius: 2px; }
.spec-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.spec-table th, .spec-table td { text-align: left; padding: 11px 16px; border-bottom: 1px solid var(--color-gray-100); }
.spec-table th { background: var(--color-gray-50); color: var(--color-primary); font-weight: 700; width: 40%; }
.chip-list { display: flex; flex-wrap: wrap; gap: 10px; }
.chip-list span { font-size: 14px; background: var(--color-gray-50); border: 1px solid var(--color-gray-100); padding: 6px 14px; border-radius: 20px; color: var(--color-gray-700); }

/* ---------- 关于我们 ---------- */
.about-intro { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.about-intro__media { background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light)); border-radius: var(--radius-lg); aspect-ratio: 4/3; display: flex; align-items: center; justify-content: center; color: #fff; }
.about-intro h2 { color: var(--color-primary); font-size: 32px; margin-bottom: 18px; }
.about-intro p { color: var(--color-gray-700); margin-bottom: 16px; font-size: 16px; }
.about-stats { display: grid; grid-template-columns: repeat(4,1fr); gap: 24px; margin-top: 40px; }
.about-stat { text-align: center; padding: 28px 16px; background: #fff; border: 1px solid var(--color-gray-100); border-radius: var(--radius-lg); }
.about-stat .num { font-size: 40px; font-weight: 800; color: var(--color-accent); line-height: 1; }
.about-stat .label { margin-top: 10px; color: var(--color-gray-700); font-size: 15px; }

.timeline { max-width: 820px; margin: 0 auto; position: relative; padding-left: 32px; }
.timeline::before { content:""; position:absolute; left: 7px; top: 6px; bottom: 6px; width: 2px; background: var(--color-gray-300); }
.timeline__item { position: relative; padding-bottom: 34px; }
.timeline__item::before { content:""; position:absolute; left: -32px; top: 4px; width: 16px; height: 16px; border-radius: 50%; background: var(--color-accent); border: 3px solid #fff; box-shadow: 0 0 0 2px var(--color-accent); }
.timeline__year { font-weight: 800; color: var(--color-primary); font-size: 18px; }
.timeline__item p { color: var(--color-gray-700); margin-top: 4px; }

.value-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 24px; }
.value-card { background:#fff; border:1px solid var(--color-gray-100); border-radius: var(--radius-lg); padding: 30px; }
.value-card__icon { width:52px;height:52px;border-radius:12px;background:var(--color-gray-50);display:flex;align-items:center;justify-content:center;color:var(--color-primary);margin-bottom:16px; }
.value-card h3 { color: var(--color-primary); font-size: 19px; margin-bottom: 10px; }
.value-card p { color: var(--color-gray-700); font-size: 15px; }

/* ---------- 联系我们 ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1.1fr; gap: 44px; align-items: start; }
.contact-info__item { display: flex; gap: 16px; margin-bottom: 28px; align-items: flex-start; }
.contact-info__icon { width: 48px; height: 48px; flex-shrink: 0; border-radius: 12px; background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light)); color: #fff; display: flex; align-items: center; justify-content: center; }
.contact-info__item h4 { color: var(--color-primary); font-size: 17px; margin-bottom: 4px; }
.contact-info__item p { color: var(--color-gray-700); font-size: 15px; }

.form { background: #fff; border: 1px solid var(--color-gray-100); border-radius: var(--radius-lg); padding: 40px; box-shadow: var(--shadow-md); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.form-group { margin-bottom: 22px; }
.form-group label { display: block; font-weight: 600; font-size: 14px; margin-bottom: 8px; color: var(--color-gray-900); }
.form-group label .req { color: var(--color-accent); }
.form-group input, .form-group select, .form-group textarea {
  width: 100%; padding: 12px 15px;
  border: 1.5px solid var(--color-gray-300); border-radius: var(--radius);
  font-size: 15px; font-family: inherit; transition: var(--transition);
  background: var(--color-gray-50);
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  outline: none; border-color: var(--color-primary); background: #fff;
  box-shadow: 0 0 0 3px rgba(10,61,122,0.1);
}
.form-group textarea { resize: vertical; min-height: 120px; }
.form__note { font-size: 13px; color: var(--color-gray-500); margin-top: 14px; }
.form__success { display: none; padding: 16px; background: #e6f6ee; border: 1px solid var(--color-success); border-radius: var(--radius); color: var(--color-success); font-weight: 600; margin-top: 16px; }
.form__success.show { display: block; }

.map-embed { margin-top: 44px; border-radius: var(--radius-lg); overflow: hidden; border: 1px solid var(--color-gray-100); background: var(--color-gray-100); aspect-ratio: 21/9; display:flex;align-items:center;justify-content:center;color:var(--color-gray-500); }

/* ============================================================
   动画
   ============================================================ */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 960px) {
  .hero__inner { grid-template-columns: 1fr; gap: 40px; padding: 64px 0 72px; }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .products-grid { grid-template-columns: 1fr; }
  .apps-grid { grid-template-columns: 1fr; }
  .footer__grid { grid-template-columns: 1fr 1fr; }
  .about-intro { grid-template-columns: 1fr; }
  .about-stats { grid-template-columns: repeat(2,1fr); }
  .value-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .prod-detail { grid-template-columns: 1fr; }
}

@media (max-width: 720px) {
  .nav-menu {
    position: fixed; top: 74px; left: 0; right: 0;
    background: #fff; flex-direction: column; align-items: stretch;
    padding: 16px; gap: 4px; box-shadow: var(--shadow-lg);
    transform: translateY(-150%); transition: transform var(--transition);
  }
  .nav-menu.open { transform: translateY(0); }
  .nav-menu a { padding: 13px 16px; }
  .nav-toggle { display: flex; }
  .nav-phone { display: none; }
  .nav-cta .btn { display: none; }
  .hero__stats { grid-template-columns: 1fr 1fr; }
  .cta-band { padding: 36px 28px; flex-direction: column; text-align: center; }
  .form-row { grid-template-columns: 1fr; }
  .about-stats { grid-template-columns: 1fr 1fr; }
  .section { padding: 60px 0; }
}