/* ========================================
   东腾浚威石油科技 - 工业润滑油营销站
   主色: #1a3a5c  辅色: #e8530e
   ======================================== */

/* Reset & Base */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: #333;
  background: #f5f5f5;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: #1a3a5c; text-decoration: none; transition: color .2s; }
a:hover { color: #e8530e; }

img { max-width: 100%; height: auto; display: block; }

ul, ol { list-style: none; }

/* ---- Typography ---- */
h1, h2, h3, h4, h5 { color: #1a3a5c; line-height: 1.3; }
h1 { font-size: 2rem; }
h2 { font-size: 1.6rem; }
h3 { font-size: 1.3rem; }
h4 { font-size: 1.1rem; }

/* ---- Layout helpers ---- */
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.section { padding: 60px 0; }
.section-gray { background: #f0f0f0; }
.section-dark { background: #1a3a5c; color: #fff; }
.section-dark h2, .section-dark h3 { color: #fff; }
.section-title {
  text-align: center;
  margin-bottom: 40px;
}
.section-title h2 {
  display: inline-block;
  position: relative;
  padding-bottom: 12px;
}
.section-title h2::after {
  content: '';
  position: absolute;
  bottom: 0; left: 50%;
  transform: translateX(-50%);
  width: 60px; height: 3px;
  background: #e8530e;
}
.section-title p {
  color: #666;
  margin-top: 10px;
  font-size: .95rem;
}

/* ========================================
   HEADER / NAV
   ======================================== */
.header {
  background: #fff;
  box-shadow: 0 2px 8px rgba(0,0,0,.08);
  position: sticky;
  top: 0;
  z-index: 1000;
}
.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.1rem;
  font-weight: 700;
  color: #1a3a5c;
}
.logo-icon {
  width: 40px; height: 40px;
  background: linear-gradient(135deg, #1a3a5c, #e8530e);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.2rem;
  font-weight: 900;
}
.logo-img {
  width: 60px; height: 60px;
  border-radius: 8px;
  object-fit: contain;
  background: #fff;
  padding: 4px;
}
.header-phone {
  font-size: 1.1rem;
  font-weight: 700;
  color: #e8530e;
  white-space: nowrap;
  margin-left: 12px;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.header-phone:hover {
  color: #c44408;
}
.nav-list {
  display: flex;
  gap: 6px;
}
.nav-list a {
  display: block;
  padding: 8px 14px;
  font-size: .9rem;
  color: #555;
  border-radius: 4px;
  transition: all .2s;
}
.nav-list a:hover,
.nav-list a.active {
  color: #e8530e;
  background: rgba(232,83,14,.06);
}

/* Mobile menu toggle */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: #1a3a5c;
  cursor: pointer;
  padding: 4px 8px;
}

/* ========================================
   HERO BANNER
   ======================================== */
.hero {
  background: linear-gradient(135deg, #1a3a5c 0%, #0d2137 60%, #1a3a5c 100%);
  color: #fff;
  text-align: center;
  padding: 80px 0 60px;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 80%, rgba(232,83,14,.15) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(232,83,14,.1) 0%, transparent 50%);
}
.hero h1 {
  font-size: 2.4rem;
  color: #fff;
  margin-bottom: 16px;
  position: relative;
}
.hero h1 span { color: #e8530e; }
.hero p {
  font-size: 1.1rem;
  color: rgba(255,255,255,.85);
  max-width: 600px;
  margin: 0 auto 30px;
  position: relative;
}
.hero-tags {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 30px;
  position: relative;
}
.hero-tags span {
  padding: 6px 16px;
  background: rgba(232,83,14,.2);
  border: 1px solid rgba(232,83,14,.4);
  border-radius: 20px;
  font-size: .85rem;
  color: rgba(255,255,255,.9);
}
.hero-btns {
  position: relative;
  display: flex;
  justify-content: center;
  gap: 16px;
}
.btn-primary {
  padding: 12px 32px;
  background: #e8530e;
  color: #fff;
  border-radius: 6px;
  font-size: 1rem;
  font-weight: 600;
  transition: background .2s;
  display: inline-block;
}
.btn-primary:hover { background: #d04a09; color: #fff; }
.btn-secondary {
  padding: 12px 32px;
  background: rgba(255,255,255,.15);
  color: #fff;
  border: 1px solid rgba(255,255,255,.3);
  border-radius: 6px;
  font-size: 1rem;
  transition: all .2s;
  display: inline-block;
}
.btn-secondary:hover { background: rgba(255,255,255,.25); color: #fff; }

/* ========================================
   PRODUCT GRID
   ======================================== */
.product-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.product-card {
  background: #fff;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 4px 16px rgba(0,0,0,.06);
  transition: transform .2s, box-shadow .2s;
}
.product-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0,0,0,.12);
}
.product-card-img {
  height: 180px;
  background: linear-gradient(135deg, #1a3a5c, #2a5a8c);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 2rem;
  font-weight: 700;
  position: relative;
}
.product-card-img::after {
  content: '';
  position: absolute;
  right: 10px; bottom: 10px;
  width: 40px; height: 40px;
  background: rgba(232,83,14,.6);
  border-radius: 50%;
}
.product-card-body {
  padding: 20px;
}
.product-card-body h3 {
  margin-bottom: 8px;
  font-size: 1.1rem;
}
.product-card-body p {
  color: #666;
  font-size: .9rem;
  line-height: 1.5;
}
.product-card-body .btn-link {
  display: inline-block;
  margin-top: 12px;
  color: #e8530e;
  font-size: .9rem;
  font-weight: 600;
}
.product-card-body .btn-link:hover { text-decoration: underline; }

/* ========================================
   SOLUTION / CASE CARD
   ======================================== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.info-card {
  background: #fff;
  border-radius: 10px;
  padding: 30px;
  box-shadow: 0 4px 16px rgba(0,0,0,.06);
  transition: transform .2s;
}
.info-card:hover { transform: translateY(-3px); }
.info-card-icon {
  width: 50px; height: 50px;
  background: linear-gradient(135deg, #1a3a5c, #e8530e);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.4rem;
  margin-bottom: 16px;
}
.info-card h3 { margin-bottom: 10px; }
.info-card p { color: #666; font-size: .9rem; }

/* ========================================
   NEWS / ARTICLE LIST
   ======================================== */
.news-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.news-item {
  background: #fff;
  border-radius: 10px;
  padding: 24px;
  box-shadow: 0 4px 12px rgba(0,0,0,.06);
  transition: transform .2s;
}
.news-item:hover { transform: translateY(-2px); }
.news-item-date {
  font-size: .8rem;
  color: #999;
  margin-bottom: 8px;
}
.news-item h3 {
  font-size: 1.05rem;
  margin-bottom: 8px;
}
.news-item p {
  color: #666;
  font-size: .9rem;
  line-height: 1.5;
}
.news-item .btn-link {
  display: inline-block;
  margin-top: 10px;
  color: #e8530e;
  font-size: .85rem;
  font-weight: 600;
}

/* ========================================
   COOPERATION / CTA
   ======================================== */
.cta-box {
  background: linear-gradient(135deg, #1a3a5c, #0d2137);
  color: #fff;
  border-radius: 12px;
  padding: 40px;
  text-align: center;
}
.cta-box h2 { color: #fff; margin-bottom: 12px; }
.cta-box p { color: rgba(255,255,255,.8); max-width: 500px; margin: 0 auto 24px; }
.cta-box .btn-primary { font-size: 1.1rem; }

.coop-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.coop-item {
  background: #fff;
  border-radius: 10px;
  padding: 24px;
  text-align: center;
  box-shadow: 0 4px 12px rgba(0,0,0,.06);
}
.coop-item h3 { color: #e8530e; margin-bottom: 10px; }
.coop-item p { color: #666; font-size: .9rem; }

/* ========================================
   FOOTER
   ======================================== */
.footer {
  background: #0d1f33;
  color: rgba(255,255,255,.7);
  padding: 50px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 30px;
  margin-bottom: 30px;
}
.footer h4 { color: #fff; margin-bottom: 16px; font-size: 1rem; }
.footer p { font-size: .85rem; line-height: 1.7; }
.footer ul li { margin-bottom: 8px; }
.footer ul a { color: rgba(255,255,255,.7); font-size: .85rem; }
.footer ul a:hover { color: #e8530e; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.1);
  padding: 20px 0;
  text-align: center;
  font-size: .8rem;
  color: rgba(255,255,255,.5);
}

/* ========================================
   CONTACT FORM
   ======================================== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}
.contact-info-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 20px;
}
.contact-info-list .icon {
  width: 36px; height: 36px;
  background: rgba(26,58,92,.08);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #1a3a5c;
  font-size: 1rem;
  flex-shrink: 0;
}
.contact-info-list .text h4 { font-size: .95rem; margin-bottom: 4px; }
.contact-info-list .text p { color: #666; font-size: .9rem; }

.form-group { margin-bottom: 18px; }
.form-group label {
  display: block;
  font-size: .9rem;
  color: #555;
  margin-bottom: 6px;
  font-weight: 600;
}
.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid #ddd;
  border-radius: 6px;
  font-size: .9rem;
  font-family: inherit;
  background: #fff;
  transition: border-color .2s;
}
.form-group input:focus,
.form-group textarea:focus {
  border-color: #1a3a5c;
  outline: none;
}
.form-group textarea { min-height: 100px; resize: vertical; }
.btn-submit {
  padding: 12px 40px;
  background: #e8530e;
  color: #fff;
  border: none;
  border-radius: 6px;
  font-size: 1rem;
  cursor: pointer;
  transition: background .2s;
}
.btn-submit:hover { background: #d04a09; }

/* ========================================
   ABOUT / TIMELINE
   ======================================== */
.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}
.about-img-placeholder {
  height: 300px;
  background: linear-gradient(135deg, #1a3a5c, #2a5a8c);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,.6);
  font-size: 1.2rem;
}
.about-text p { color: #666; line-height: 1.8; margin-bottom: 16px; }

.timeline { position: relative; padding: 20px 0; }
.timeline::before {
  content: '';
  position: absolute;
  left: 50%; top: 0; bottom: 0;
  width: 2px;
  background: #1a3a5c;
  transform: translateX(-50%);
}
.timeline-item {
  display: flex;
  justify-content: flex-end;
  padding-right: calc(50% + 30px);
  margin-bottom: 30px;
  position: relative;
}
.timeline-item:nth-child(even) {
  justify-content: flex-start;
  padding-right: 0;
  padding-left: calc(50% + 30px);
}
.timeline-item::before {
  content: '';
  position: absolute;
  width: 16px; height: 16px;
  background: #e8530e;
  border-radius: 50%;
  top: 6px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1;
}
.timeline-item .content {
  background: #fff;
  border-radius: 8px;
  padding: 16px 20px;
  box-shadow: 0 2px 8px rgba(0,0,0,.06);
  max-width: 400px;
}
.timeline-item .content h4 { font-size: .9rem; }
.timeline-item .content p { color: #666; font-size: .85rem; }

/* ========================================
   BREADCRUMB
   ======================================== */
.breadcrumb {
  padding: 12px 0;
  font-size: .85rem;
  color: #999;
}
.breadcrumb a { color: #666; }
.breadcrumb span { margin: 0 6px; }

/* ========================================
   PAGE HERO (sub pages)
   ======================================== */
.page-hero {
  background: linear-gradient(135deg, #1a3a5c 0%, #0d2137 100%);
  color: #fff;
  padding: 50px 0 40px;
  text-align: center;
}
.page-hero h1 { color: #fff; font-size: 1.8rem; margin-bottom: 10px; }
.page-hero p { color: rgba(255,255,255,.8); font-size: .95rem; }

/* ========================================
   ARTICLE DETAIL
   ======================================== */
.article-detail {
  max-width: 800px;
  margin: 0 auto;
  background: #fff;
  border-radius: 10px;
  padding: 40px;
  box-shadow: 0 4px 16px rgba(0,0,0,.06);
}
.article-detail h2 { margin-bottom: 16px; }
.article-meta {
  font-size: .85rem;
  color: #999;
  margin-bottom: 20px;
  border-bottom: 1px solid #eee;
  padding-bottom: 12px;
}
.article-meta span { margin-right: 16px; }
.article-body p { color: #555; line-height: 1.8; margin-bottom: 16px; }
.article-body h3 { margin: 24px 0 12px; color: #1a3a5c; }
.article-body ul {
  padding-left: 20px;
  margin-bottom: 16px;
}
.article-body ul li {
  color: #555;
  line-height: 1.7;
  margin-bottom: 6px;
  list-style: disc;
}
.article-tags {
  margin-top: 24px;
  display: flex;
  gap: 8px;
}
.article-tags span {
  padding: 4px 12px;
  background: rgba(26,58,92,.06);
  color: #1a3a5c;
  border-radius: 4px;
  font-size: .8rem;
}
.faq-section { margin-top: 32px; }
.faq-item {
  margin-bottom: 16px;
  padding: 16px;
  background: rgba(26,58,92,.03);
  border-radius: 8px;
}
.faq-item h4 { color: #1a3a5c; font-size: .95rem; margin-bottom: 8px; }
.faq-item p { color: #666; font-size: .9rem; }

/* ========================================
   STATS BAR
   ======================================== */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.stat-item {
  text-align: center;
  padding: 24px;
  background: #fff;
  border-radius: 10px;
  box-shadow: 0 4px 12px rgba(0,0,0,.06);
}
.stat-item .num {
  font-size: 2rem;
  font-weight: 700;
  color: #e8530e;
  margin-bottom: 4px;
}
.stat-item .label {
  color: #666;
  font-size: .9rem;
}

/* ---- 全国服务区域 ---- */
.regions-section { padding: 50px 0; background: #f0f0f0; }
.regions-section .section-title h2 { color: #1a3a5c; }
.regions-section .section-title p { color: #666; margin-top: 6px; }
.regions-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.region-group {
  background: #fff;
  border-radius: 8px;
  padding: 18px;
  box-shadow: 0 1px 4px rgba(0,0,0,.06);
}
.region-group-title {
  font-size: 1rem;
  font-weight: 700;
  color: #1a3a5c;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 6px;
}
.region-group-title::before {
  content: '';
  display: inline-block;
  width: 4px;
  height: 16px;
  background: #e8530e;
  border-radius: 2px;
}
.region-group-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.region-group-links a {
  font-size: .85rem;
  color: #555;
  padding: 3px 8px;
  background: #f8f8f8;
  border-radius: 4px;
  transition: all .2s;
  text-decoration: none;
}
.region-group-links a:hover {
  color: #e8530e;
  background: #fff3eb;
}

/* ---- Footer 服务区域关键词 ---- */
.footer-regions {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid rgba(255,255,255,.15);
}
.footer-regions h5 { color: rgba(255,255,255,.9); margin-bottom: 8px; font-size: .9rem; }
.footer-regions-links {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.footer-regions-links a {
  font-size: .75rem;
  color: rgba(255,255,255,.6);
  text-decoration: none;
  transition: color .2s;
}
.footer-regions-links a:hover { color: #e8530e; }

/* ---- Footer 全国服务区域（参考站风格） ---- */
.service-area {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid rgba(255,255,255,.15);
}
.service-area h5 {
  color: rgba(255,255,255,.85);
  font-size: .9rem;
  margin-bottom: 10px;
}
.service-area-links {
  line-height: 2;
}
.service-area-links a {
  font-size: .8rem;
  color: rgba(255,255,255,.55);
  text-decoration: none;
  margin-right: 2px;
  transition: color .2s;
}
.service-area-links a:hover { color: #e8530e; }

/* ---- 全国地域板块（参考站版式 dt/dd 灰白交替） ---- */
.area-section {
  padding: 40px 0;
  background: #fff;
}
.area-section .section-title {
  margin-bottom: 24px;
}
.area-section .section-title h2 {
  color: #1a3a5c;
}
.area-section .section-title p {
  color: #888;
  font-size: .9rem;
  margin-top: 6px;
}
.area-region-list {
  margin-top: 30px;
}
.area-region-list ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.area-region-list li {
  padding: 10px 15px;
  background: #f5f5f5;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  line-height: 26px;
}
.area-region-list li:nth-child(2n) {
  background: #fff;
}
.area-region-list dt {
  font-weight: bold;
  flex-shrink: 0;
  margin-right: 15px;
}
.area-region-list dt a {
  font-size: .9rem;
  font-weight: 700;
  color: #1a3a5c;
  text-decoration: none;
}
.area-region-list dt a:hover {
  color: #e8530e;
}
.area-region-list dd {
  margin: 0;
  width: 85%;
}
.area-region-list dd a {
  display: inline-block;
  color: #666;
  margin-right: 20px;
  font-size: .82rem;
  text-decoration: none;
  line-height: 26px;
}
.area-region-list dd a:hover {
  color: #e8530e;
}
@media (max-width: 640px) {
  .area-region-list dd { width: 100%; }
  .area-region-list dd a { margin-right: 12px; font-size: .75rem; }
  .area-region-list dt a { font-size: .85rem; }
}

/* ========================================
   RESPONSIVE
   ======================================== */
@media (max-width: 900px) {
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .card-grid { grid-template-columns: 1fr; }
  .news-list { grid-template-columns: 1fr; }
  .coop-list { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; }
  .about-content { grid-template-columns: 1fr; }
  .stats-bar { grid-template-columns: repeat(2, 1fr); }
  .timeline::before { left: 20px; }
  .timeline-item,
  .timeline-item:nth-child(even) {
    padding-left: 50px;
    padding-right: 0;
    justify-content: flex-start;
  }
  .timeline-item::before { left: 20px; }
}

@media (max-width: 640px) {
  .header .container { height: 56px; }
  .nav-list {
    display: none;
    position: absolute;
    top: 56px; left: 0; right: 0;
    background: #fff;
    flex-direction: column;
    padding: 10px 20px;
    box-shadow: 0 4px 12px rgba(0,0,0,.1);
    gap: 2px;
  }
  .nav-list.open { display: flex; }
  .nav-list a { padding: 12px 10px; }
  .menu-toggle { display: block; }
  .hero { padding: 50px 0 40px; }
  .hero h1 { font-size: 1.5rem; }
  .hero p { font-size: .9rem; }
  .hero-tags { flex-wrap: wrap; }
  .hero-btns { flex-direction: column; align-items: center; }
  .product-grid { grid-template-columns: 1fr; }
  .coop-list { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .regions-grid { grid-template-columns: repeat(2, 1fr); }
  .region-group-links { gap: 4px; }
  .stats-bar { grid-template-columns: 1fr 1fr; }
  .section { padding: 40px 0; }
  .page-hero { padding: 35px 0 28px; }
  .page-hero h1 { font-size: 1.4rem; }
}