/* =====================================================
   KOBELCO-CN — 神钢配件外贸站样式
   配色: 工程蓝 #0b3d91 + 机械橙 #ff7a00
   ===================================================== */

:root {
  --blue: #0b3d91;
  --blue-dark: #061a3f;
  --blue-light: #eaf1fb;
  --orange: #ff7a00;
  --orange-dark: #e05e00;
  --text: #1c2333;
  --text-muted: #5a6478;
  --bg: #ffffff;
  --bg-alt: #f5f7fa;
  --radius: 14px;
  --shadow: 0 6px 24px rgba(11, 61, 145, 0.10);
  --max-w: 1160px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

img, svg { max-width: 100%; display: block; }

.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 20px;
}

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid #e6eaf1;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.logo-mark {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--blue), #1a5fd0);
  color: #fff;
  font-weight: 800;
  font-size: 22px;
  display: grid;
  place-items: center;
}

.logo-text {
  font-weight: 800;
  font-size: 20px;
  color: var(--blue-dark);
  letter-spacing: 0.5px;
}

.logo-text b { color: var(--orange); }

.main-nav {
  display: flex;
  align-items: center;
  gap: 26px;
}

.main-nav a {
  text-decoration: none;
  color: var(--text);
  font-size: 15px;
  font-weight: 500;
  transition: color 0.2s;
}

.main-nav a:hover { color: var(--blue); }

.main-nav .nav-cta {
  background: var(--orange);
  color: #fff !important;
  padding: 8px 18px;
  border-radius: 999px;
  font-weight: 600;
}

.main-nav .nav-cta:hover { background: var(--orange-dark); }

.header-actions { display: flex; align-items: center; gap: 10px; }

.lang-toggle {
  border: 1.5px solid var(--blue);
  background: #fff;
  color: var(--blue);
  font-weight: 700;
  font-size: 13px;
  padding: 6px 14px;
  border-radius: 999px;
  cursor: pointer;
  transition: all 0.2s;
}

.lang-toggle:hover { background: var(--blue); color: #fff; }

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}

.menu-toggle span {
  width: 24px;
  height: 2.5px;
  background: var(--blue-dark);
  border-radius: 2px;
  transition: transform 0.25s, opacity 0.25s;
}

.menu-toggle.open span:nth-child(1) { transform: translateY(7.5px) rotate(45deg); }
.menu-toggle.open span:nth-child(2) { opacity: 0; }
.menu-toggle.open span:nth-child(3) { transform: translateY(-7.5px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  color: #fff;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
}

.hero-bg svg { width: 100%; height: 100%; }

.hero-content {
  position: relative;
  padding: 96px 20px 80px;
}

.hero-tag {
  display: inline-block;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.25);
  padding: 6px 16px;
  border-radius: 999px;
  font-size: 14px;
  margin-bottom: 20px;
}

.hero h1 {
  font-size: clamp(34px, 5.5vw, 60px);
  line-height: 1.18;
  letter-spacing: 1px;
  margin-bottom: 18px;
}

.hero-sub {
  max-width: 620px;
  font-size: 17px;
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: 32px;
}

.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 48px; }

.btn {
  display: inline-block;
  padding: 13px 32px;
  border-radius: 999px;
  font-size: 16px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: transform 0.2s, box-shadow 0.2s, background 0.2s;
}

.btn-primary {
  background: var(--orange);
  color: #fff;
  box-shadow: 0 8px 22px rgba(255, 122, 0, 0.35);
}

.btn-primary:hover { background: var(--orange-dark); transform: translateY(-2px); }

.btn-ghost {
  background: transparent;
  color: #fff;
  border: 1.5px solid rgba(255, 255, 255, 0.6);
}

.btn-ghost:hover { background: rgba(255, 255, 255, 0.12); }

.btn-block { width: 100%; }

.hero-stats {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  max-width: 760px;
}

.hero-stats li {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: var(--radius);
  padding: 16px 12px;
  text-align: center;
}

.hero-stats strong {
  display: block;
  font-size: 28px;
  color: var(--orange);
}

.hero-stats span { font-size: 13px; color: rgba(255, 255, 255, 0.8); }

/* ---------- 通用 Section ---------- */
.section { padding: 84px 0; }

.section-alt { background: var(--bg-alt); }

.section-head { text-align: center; margin-bottom: 48px; }

.section-head h2 {
  font-size: clamp(26px, 3.5vw, 36px);
  color: var(--blue-dark);
  margin-bottom: 10px;
}

.section-head p { color: var(--text-muted); font-size: 16px; }

.grid { display: grid; gap: 22px; }

.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }

/* ---------- 产品卡片 ---------- */
.card {
  background: #fff;
  border: 1px solid #e6eaf1;
  border-radius: var(--radius);
  padding: 28px 22px;
  transition: transform 0.25s, box-shadow 0.25s;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow);
  border-color: rgba(11, 61, 145, 0.25);
}

.card-icon { font-size: 34px; margin-bottom: 14px; }

.card h3 { font-size: 18px; color: var(--blue-dark); margin-bottom: 8px; }

.card p { font-size: 14px; color: var(--text-muted); }

/* ---------- 机型标签 ---------- */
.model-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: center;
  max-width: 820px;
  margin: 0 auto;
}

.tag {
  padding: 10px 24px;
  border-radius: 999px;
  background: #fff;
  border: 1.5px solid #d4dcea;
  font-weight: 600;
  color: var(--blue);
  font-size: 15px;
}

.tag.hot {
  background: var(--blue);
  border-color: var(--blue);
  color: #fff;
  box-shadow: 0 6px 16px rgba(11, 61, 145, 0.3);
}

.models-note {
  width: 100%;
  text-align: center;
  color: var(--text-muted);
  font-size: 13px;
  margin-top: 10px;
}

/* ---------- 代理网络 ---------- */
.region-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 34px 26px;
  text-align: center;
  border-top: 4px solid var(--orange);
  box-shadow: var(--shadow);
}

.region-pin { font-size: 32px; margin-bottom: 10px; }

.region-card h3 { color: var(--blue-dark); margin-bottom: 10px; font-size: 19px; }

.region-card p { font-size: 14px; color: var(--text-muted); }

/* ---------- 关于我们 ---------- */
.about-wrap {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 48px;
  align-items: start;
}

.about-text h2 {
  font-size: clamp(26px, 3.5vw, 36px);
  color: var(--blue-dark);
  margin-bottom: 18px;
}

.about-text p { color: var(--text-muted); margin-bottom: 14px; }

.chairman {
  display: flex;
  gap: 16px;
  align-items: center;
  margin-top: 28px;
  background: #fff;
  border: 1px solid #e6eaf1;
  border-left: 4px solid var(--orange);
  border-radius: var(--radius);
  padding: 20px;
}

.chairman-avatar {
  width: 58px;
  height: 58px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--blue), #1a5fd0);
  color: #fff;
  font-size: 24px;
  font-weight: 700;
  display: grid;
  place-items: center;
  flex-shrink: 0;
}

.chairman strong { color: var(--blue-dark); font-size: 16px; }

.chairman p { font-size: 14px; color: var(--text-muted); margin: 4px 0 0; }

.about-aside { display: flex; flex-direction: column; gap: 16px; }

.aside-box {
  background: #fff;
  border: 1px solid #e6eaf1;
  border-radius: var(--radius);
  padding: 20px 22px;
}

.aside-box h4 { color: var(--blue-dark); margin-bottom: 6px; font-size: 16px; }

.aside-box p { font-size: 14px; color: var(--text-muted); }

/* ---------- 联系我们 ---------- */
.contact-wrap {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 40px;
  align-items: start;
}

.contact-form {
  background: #fff;
  border: 1px solid #e6eaf1;
  border-radius: var(--radius);
  padding: 30px;
  box-shadow: var(--shadow);
}

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

.form-group { margin-bottom: 16px; }

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--blue-dark);
  margin-bottom: 6px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1.5px solid #d4dcea;
  border-radius: 10px;
  font-size: 15px;
  font-family: inherit;
  transition: border-color 0.2s;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(11, 61, 145, 0.12);
}

.form-group input.invalid,
.form-group textarea.invalid { border-color: #d93025; }

.form-status { margin-top: 12px; font-size: 14px; min-height: 20px; }
.form-status.ok { color: #1a7f37; }
.form-status.err { color: #d93025; }

.contact-info {
  background: linear-gradient(160deg, var(--blue), var(--blue-dark));
  color: #fff;
  border-radius: var(--radius);
  padding: 30px;
}

.contact-info h3 { margin-bottom: 18px; font-size: 19px; }

.contact-info ul { list-style: none; display: flex; flex-direction: column; gap: 14px; }

.contact-info li { display: flex; gap: 10px; font-size: 15px; align-items: flex-start; }

.ci-note {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  font-size: 13px;
  color: rgba(255, 255, 255, 0.75);
}

/* ---------- 页脚 ---------- */
.site-footer {
  background: var(--blue-dark);
  color: rgba(255, 255, 255, 0.75);
  padding: 34px 0;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.footer-logo { font-size: 20px; font-weight: 800; color: #fff; }
.footer-logo b { color: var(--orange); }
.footer-note { font-size: 13px; max-width: 640px; }

/* =====================================================
   响应式 Responsive
   ===================================================== */
@media (max-width: 960px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: 1fr; }
  .about-wrap, .contact-wrap { grid-template-columns: 1fr; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }

  .main-nav {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: #fff;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 10px 20px 20px;
    border-bottom: 1px solid #e6eaf1;
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.08);
    display: none;
  }

  .main-nav.open { display: flex; }

  .main-nav a { padding: 14px 4px; border-bottom: 1px solid #eef1f6; }

  .main-nav .nav-cta {
    margin-top: 14px;
    text-align: center;
    border-bottom: none;
  }

  .menu-toggle { display: flex; }
}

@media (max-width: 560px) {
  .grid-4 { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .section { padding: 60px 0; }
  .hero-content { padding: 64px 20px 56px; }
  .footer-inner { flex-direction: column; text-align: center; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}

/* =====================================================
   v2 新增：业务矩阵 / 番号查询 / 技术团队 / 时间线 / 知识卡
   ===================================================== */

.grid-2 { grid-template-columns: repeat(2, 1fr); }

.grid-2x2 { grid-template-columns: repeat(2, 1fr); }

/* --- 业务矩阵卡片 --- */
.biz-card {
  position: relative;
  background: #fff;
  border: 1px solid #e6eaf1;
  border-radius: var(--radius);
  padding: 30px 26px 26px;
  transition: transform 0.25s, box-shadow 0.25s;
}

.biz-card:hover { transform: translateY(-5px); box-shadow: var(--shadow); }

.biz-badge {
  position: absolute;
  top: 16px;
  right: 16px;
  background: var(--blue);
  color: #fff;
  font-size: 12px;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 999px;
}

.biz-badge.badge-global { background: var(--orange); }

.biz-card .card-icon { margin-bottom: 10px; }

.biz-card h3 { font-size: 20px; color: var(--blue-dark); margin-bottom: 10px; }

.biz-card p { font-size: 14px; color: var(--text-muted); }

/* --- 番号查询 --- */
.section-query {
  background: linear-gradient(160deg, #0b3d91 0%, #061a3f 100%);
}

.section-query .section-head h2 { color: #fff; }
.section-query .section-head p { color: rgba(255, 255, 255, 0.75); }

.query-box {
  max-width: 860px;
  margin: 0 auto;
  background: #fff;
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.25);
}

.query-fields {
  display: grid;
  grid-template-columns: 1.4fr 1fr auto;
  gap: 16px;
  align-items: end;
}

.query-field label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--blue-dark);
  margin-bottom: 6px;
}

.query-field input {
  width: 100%;
  padding: 12px 14px;
  border: 1.5px solid #d4dcea;
  border-radius: 10px;
  font-size: 15px;
  letter-spacing: 0.5px;
}

.query-field input:focus {
  outline: none;
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(11, 61, 145, 0.12);
}

.query-box .form-status { margin: 10px 2px 0; }

.query-result {
  max-width: 860px;
  margin: 20px auto 0;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: var(--radius);
  padding: 22px 26px;
  color: #fff;
}

.query-result h3 { font-size: 18px; margin-bottom: 8px; }

.query-result p { font-size: 14px; color: rgba(255, 255, 255, 0.85); }

.qr-actions { display: flex; gap: 12px; flex-wrap: wrap; margin: 16px 0 10px; }

.qr-actions .btn { padding: 10px 24px; font-size: 14px; }

.qr-dark { border-color: rgba(255,255,255,0.6); }

.qr-note { font-size: 12px; color: rgba(255, 255, 255, 0.65) !important; }

/* --- 三省卡片补充 --- */
.region-year {
  display: inline-block;
  background: var(--orange);
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  padding: 4px 14px;
  border-radius: 999px;
  margin-bottom: 12px;
}

.region-addr {
  font-size: 13px;
  color: var(--blue);
  font-weight: 600;
  margin-bottom: 8px;
}

.model-strip { margin-top: 40px; text-align: center; }

.model-strip h4 { color: var(--blue-dark); font-size: 17px; margin-bottom: 14px; }

/* --- 技术团队 --- */
.tech-card {
  display: flex;
  gap: 18px;
  align-items: flex-start;
  background: #fff;
  border: 1px solid #e6eaf1;
  border-left: 4px solid var(--orange);
  border-radius: var(--radius);
  padding: 24px;
  transition: transform 0.25s, box-shadow 0.25s;
}

.tech-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }

.tech-avatar {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--blue), #1a5fd0);
  color: #fff;
  font-size: 26px;
  font-weight: 700;
  display: grid;
  place-items: center;
  flex-shrink: 0;
}

.tech-info h3 {
  color: var(--blue-dark);
  font-size: 19px;
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 8px;
}

.medal {
  background: linear-gradient(135deg, #ff9d00, var(--orange));
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 999px;
}

.tech-info p { font-size: 14px; color: var(--text-muted); }

.tech-promise {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-top: 32px;
}

.promise-item {
  background: var(--blue-light);
  border-radius: var(--radius);
  padding: 20px 22px;
}

.promise-item strong { color: var(--blue-dark); display: block; margin-bottom: 6px; }

.promise-item p { font-size: 13px; color: var(--text-muted); }

/* --- 保养知识卡 --- */
.kn-card {
  display: flex;
  flex-direction: column;
  background: #fff;
  border: 1px solid #e6eaf1;
  border-radius: var(--radius);
  padding: 26px 22px;
  text-decoration: none;
  color: inherit;
  transition: transform 0.25s, box-shadow 0.25s;
}

.kn-card:hover { transform: translateY(-5px); box-shadow: var(--shadow); }

.kn-icon { font-size: 30px; margin-bottom: 12px; }

.kn-card h3 { font-size: 16px; color: var(--blue-dark); margin-bottom: 8px; line-height: 1.45; }

.kn-card p { font-size: 13px; color: var(--text-muted); flex: 1; }

.kn-link { margin-top: 14px; font-size: 13px; font-weight: 700; color: var(--orange); }

/* --- 时间线 --- */
.timeline { list-style: none; margin: 24px 0 4px; }

.timeline li {
  display: flex;
  gap: 14px;
  align-items: baseline;
  padding: 10px 0;
  border-bottom: 1px dashed #dde3ee;
  font-size: 14px;
}

.timeline strong {
  color: var(--orange);
  min-width: 56px;
  font-size: 15px;
}

.timeline span { color: var(--text-muted); }

.chairman em {
  display: inline-block;
  font-style: normal;
  background: var(--blue-light);
  color: var(--blue);
  font-size: 12px;
  padding: 2px 10px;
  border-radius: 999px;
  margin-left: 6px;
}

.chairman-link {
  display: inline-block;
  margin-top: 8px;
  font-size: 13px;
  font-weight: 600;
  color: var(--blue);
  text-decoration: none;
}

.chairman-link:hover { text-decoration: underline; }

/* --- 响应式补充 --- */
@media (max-width: 960px) {
  .grid-2x2, .grid-2 { grid-template-columns: 1fr; }
  .query-fields { grid-template-columns: 1fr; }
  .tech-promise { grid-template-columns: 1fr; }
}

@media (max-width: 560px) {
  .query-box { padding: 20px; }
  .qr-actions { flex-direction: column; }
  .qr-actions .btn { text-align: center; }
}

/* --- 母公司徽标与分公司标注 --- */
.hq-badge {
  display: inline-block;
  vertical-align: middle;
  margin-left: 8px;
  padding: 2px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(135deg, var(--orange), #d97706);
  letter-spacing: 1px;
}

.region-sub {
  margin-top: -4px;
  color: var(--orange);
  font-weight: 600;
}

/* --- 大赛官方报道链接 --- */
.award-note {
  margin-top: 28px;
  text-align: center;
}

.award-note a {
  display: inline-block;
  padding: 12px 22px;
  border: 1px dashed var(--orange);
  border-radius: 12px;
  font-size: 14px;
  font-weight: 600;
  color: var(--orange);
  background: rgba(234, 138, 22, 0.06);
  text-decoration: none;
  transition: background 0.2s ease, transform 0.2s ease;
}

.award-note a:hover {
  background: rgba(234, 138, 22, 0.14);
  transform: translateY(-2px);
}