/* ========== Reset & Base ========== */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, "Hiragino Sans GB", "Heiti SC", sans-serif;
  font-size: 15px;
  line-height: 1.6;
  color: #1e3a5f;
  background: #ffffff;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4 { margin: 0; font-weight: 700; line-height: 1.3; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
input, textarea, select { font-family: inherit; }

:root {
  --primary: #0f4c81;        /* 科技蓝主色 */
  --primary-2: #0a3559;      /* 深蓝 */
  --accent: #2596d1;         /* 亮蓝 */
  --accent-dark: #1e7bb8;    /* 蓝色按钮深色 */
  --accent-2: #06b6d4;       /* 天蓝点缀 */
  --light: #f0f7ff;          /* 浅蓝背景 */
  --gray-100: #f4f7fb;
  --gray-200: #dde6f0;
  --gray-400: #6b89a8;
  --gray-600: #4a6480;
  --text: #1e3a5f;
  --white: #ffffff;
  --radius: 6px;
  --shadow-sm: 0 2px 10px rgba(15,76,129,0.06);
  --shadow-md: 0 8px 24px rgba(15,76,129,0.10);
  --shadow-lg: 0 18px 50px rgba(15,76,129,0.18);
  --container: 1200px;
  --transition: all .35s cubic-bezier(.4,0,.2,1);
}

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

/* ========== 顶部通知条 ========== */
.topbar {
  background: var(--primary-2);
  color: rgba(255,255,255,0.85);
  font-size: 13px;
  padding: 8px 0;
}
.topbar-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}
.topbar strong { color: var(--accent-2); margin: 0 2px; }
.topbar-right { color: rgba(255,255,255,0.6); }

/* ========== 导航栏 ========== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--gray-200);
  transition: var(--transition);
}
.navbar.scrolled {
  box-shadow: var(--shadow-sm);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
.logo-img {
  width: 48px;
  height: 48px;
  object-fit: cover;
  border-radius: 6px;
  background: linear-gradient(135deg, #0f4c81, #2596d1);
}
.logo-text { display: flex; flex-direction: column; line-height: 1.1; }
.logo-cn { font-size: 18px; font-weight: 800; color: var(--primary); letter-spacing: 1px; }
.logo-en { font-size: 11px; color: var(--gray-400); letter-spacing: 0.5px; margin-top: 2px; }

.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-link {
  position: relative;
  padding: 10px 16px;
  font-size: 15px;
  color: var(--text);
  font-weight: 500;
  border-radius: 4px;
  transition: var(--transition);
}
.nav-link:hover { color: var(--accent-dark); }
.nav-link.active { color: var(--accent-dark); }
.nav-link.active::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 4px;
  transform: translateX(-50%);
  width: 24px;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
}
.nav-cta {
  margin-left: 12px;
  background: var(--accent);
  color: #fff !important;
  padding: 10px 22px;
}
.nav-cta:hover { background: var(--accent-dark); color: #fff; }
.nav-cta::after { display: none; }

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
}
.menu-toggle span {
  width: 24px;
  height: 2px;
  background: var(--primary);
  border-radius: 2px;
  transition: var(--transition);
}

/* ========== Hero ========== */
.hero {
  position: relative;
  min-height: 92vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  color: #fff;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
  z-index: 1;
  animation: heroZoom 18s ease-out infinite alternate;
}
@keyframes heroZoom {
  from { transform: scale(1); }
  to { transform: scale(1.08); }
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, rgba(10,53,89,0.82) 0%, rgba(15,76,129,0.55) 50%, rgba(37,150,209,0.35) 100%);
  z-index: 2;
}
.hero-content {
  position: relative;
  z-index: 3;
  width: 100%;
  padding: 120px 24px;
}
.hero-badge {
  display: inline-block;
  padding: 6px 18px;
  border: 1px solid rgba(6,182,212,0.6);
  border-radius: 30px;
  color: var(--accent-2);
  font-size: 12px;
  letter-spacing: 3px;
  margin-bottom: 24px;
  font-weight: 600;
}
.hero-title {
  font-size: clamp(36px, 5.5vw, 64px);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: 1px;
  margin-bottom: 24px;
  text-shadow: 0 4px 30px rgba(0,0,0,0.3);
}
.hero-title br { display: block; }
.hero-subtitle {
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.8;
  color: rgba(255,255,255,0.85);
  max-width: 720px;
  margin: 0 0 36px;
}
.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 64px;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 4px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 1px;
  transition: var(--transition);
  border: 1px solid transparent;
  cursor: pointer;
  white-space: nowrap;
}
.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover {
  background: var(--accent-dark);
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(37,150,209,0.4);
}
.btn-ghost {
  border-color: rgba(255,255,255,0.5);
  color: #fff;
}
.btn-ghost:hover {
  border-color: var(--accent);
  background: var(--accent);
  color: #fff;
}
.btn-block { width: 100%; justify-content: center; }
.arrow { transition: transform .3s; }
.btn:hover .arrow { transform: translateX(4px); }

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  max-width: 720px;
  padding-top: 36px;
  border-top: 1px solid rgba(255,255,255,0.15);
}
.stat { display: flex; flex-direction: column; }
.stat-num {
  font-size: clamp(28px, 3.4vw, 42px);
  font-weight: 800;
  color: var(--accent-2);
  line-height: 1;
  margin-bottom: 6px;
}
.stat-label {
  font-size: 13px;
  color: rgba(255,255,255,0.7);
  letter-spacing: 1px;
}

.hero-scroll {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 3;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  color: rgba(255,255,255,0.6);
  font-size: 11px;
  letter-spacing: 4px;
  font-weight: 600;
}
.hero-scroll-line {
  width: 1px;
  height: 50px;
  background: linear-gradient(to bottom, transparent, var(--accent-2));
  position: relative;
  overflow: hidden;
}
.hero-scroll-line::after {
  content: "";
  position: absolute;
  width: 100%;
  height: 20px;
  background: var(--accent-2);
  top: -20px;
  animation: scrollLine 2s ease-in-out infinite;
}
@keyframes scrollLine {
  to { top: 100%; }
}

/* ========== 资质条 ========== */
.bar-strip {
  background: var(--white);
  border-bottom: 1px solid var(--gray-200);
  margin-top: -1px;
}
.bar-strip-inner {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
}
.bar-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 26px 16px;
  border-right: 1px solid var(--gray-200);
}
.bar-item:last-child { border-right: none; }
.bar-icon {
  font-size: 32px;
  width: 56px;
  height: 56px;
  background: var(--light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.bar-item strong {
  display: block;
  font-size: 16px;
  color: var(--primary);
  margin-bottom: 4px;
}
.bar-item span {
  font-size: 13px;
  color: var(--gray-400);
}

/* ========== 通用 section ========== */
.section {
  padding: 100px 0;
  position: relative;
}
.section-alt { background: var(--light); }
.section-dark {
  background: var(--primary);
  color: #fff;
}
.section-head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 64px;
}
.section-eyebrow {
  display: inline-block;
  font-size: 13px;
  letter-spacing: 4px;
  color: var(--accent-dark);
  font-weight: 600;
  margin-bottom: 16px;
  position: relative;
  padding: 0 24px;
}
.section-eyebrow::before,
.section-eyebrow::after {
  content: "";
  position: absolute;
  top: 50%;
  width: 16px;
  height: 1px;
  background: var(--accent);
}
.section-eyebrow::before { left: 0; }
.section-eyebrow::after { right: 0; }
.eyebrow-light { color: var(--accent-2); }
.section-title {
  font-size: clamp(28px, 3.6vw, 40px);
  color: var(--primary);
  margin-bottom: 20px;
  letter-spacing: 1px;
}
.section-title.light { color: #fff; }
.section-desc {
  font-size: 16px;
  color: var(--gray-600);
  line-height: 1.8;
}
.section-desc.light { color: rgba(255,255,255,0.7); }

/* ========== About ========== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 80px;
  align-items: center;
}
.about-images {
  position: relative;
  padding: 24px 24px 24px 0;
}
.about-img-main {
  width: 100%;
  height: 480px;
  object-fit: cover;
  border-radius: 4px;
  box-shadow: var(--shadow-lg);
}
.about-img-logo {
  object-fit: contain;
  background: linear-gradient(135deg, var(--light) 0%, #d8e7f5 100%);
  padding: 40px;
}
.about-img-sub {
  position: absolute;
  bottom: -20px;
  left: -20px;
  width: 50%;
  height: 200px;
  object-fit: cover;
  border-radius: 4px;
  border: 8px solid #fff;
  box-shadow: var(--shadow-md);
}
.about-exp {
  position: absolute;
  top: 0;
  right: 0;
  background: var(--accent);
  color: #fff;
  width: 130px;
  height: 130px;
  border-radius: 50%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  box-shadow: var(--shadow-md);
  transform: translate(20%, -20%);
}
.about-exp-num {
  font-size: 42px;
  font-weight: 900;
  line-height: 1;
}
.about-exp-text {
  font-size: 12px;
  letter-spacing: 1px;
  margin-top: 4px;
  line-height: 1.3;
}
.about-lead {
  font-size: 19px;
  color: var(--primary);
  line-height: 1.7;
  margin: 0 0 18px;
  font-weight: 500;
}
.about-text {
  color: var(--gray-600);
  margin: 0 0 28px;
  line-height: 1.9;
}
.about-list {
  margin: 0 0 32px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.about-list li {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  color: var(--gray-600);
  line-height: 1.7;
}
.check {
  width: 24px;
  height: 24px;
  background: var(--accent);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 1px;
}
.about-list strong { color: var(--primary); }

/* ========== Products ========== */
.product-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.product-card {
  background: #fff;
  border-radius: 6px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  cursor: pointer;
  position: relative;
}
.product-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}
.product-img {
  position: relative;
  height: 220px;
  overflow: hidden;
  background: var(--gray-100);
}
.product-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .6s ease;
}
.product-card:hover .product-img img { transform: scale(1.08); }
.product-body { padding: 24px 22px; }
.product-tag {
  position: absolute;
  top: 16px;
  left: 16px;
  background: var(--accent);
  color: #fff;
  font-size: 11px;
  padding: 4px 10px;
  border-radius: 2px;
  letter-spacing: 1px;
  z-index: 1;
}
.product-body h3 {
  font-size: 18px;
  color: var(--primary);
  margin-bottom: 10px;
}
.product-body p {
  font-size: 13.5px;
  color: var(--gray-600);
  line-height: 1.7;
  margin: 0 0 16px;
}
.product-link {
  font-size: 13px;
  color: var(--accent-dark);
  font-weight: 600;
  letter-spacing: 0.5px;
  transition: var(--transition);
}
.product-card:hover .product-link { letter-spacing: 2px; }

/* ========== Cases ========== */
.case-filter {
  display: flex;
  gap: 10px;
  justify-content: center;
  margin-bottom: 48px;
  flex-wrap: wrap;
}
.filter-btn {
  padding: 8px 22px;
  border: 1px solid var(--gray-200);
  border-radius: 30px;
  font-size: 14px;
  color: var(--gray-600);
  background: #fff;
  transition: var(--transition);
}
.filter-btn:hover { border-color: var(--accent); color: var(--accent-dark); }
.filter-btn.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}
.case-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.case-item {
  position: relative;
  height: 240px;
  border-radius: 4px;
  overflow: hidden;
  cursor: pointer;
  display: block;
  background: var(--gray-100);
}
.case-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .6s ease;
}
.case-item:hover img { transform: scale(1.08); }
.case-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(10,53,89,0.88) 0%, rgba(10,53,89,0) 60%);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 22px 18px;
  color: #fff;
  opacity: 0;
  transition: var(--transition);
}
.case-item:hover .case-overlay { opacity: 1; }
.case-cat {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  font-size: 11px;
  padding: 3px 10px;
  border-radius: 2px;
  letter-spacing: 1px;
  margin-bottom: 8px;
  align-self: flex-start;
}
.case-overlay h4 {
  font-size: 15px;
  margin-bottom: 4px;
}
.case-overlay p {
  font-size: 12px;
  color: rgba(255,255,255,0.7);
  margin: 0;
}
.case-item.hidden { display: none; }

/* ========== Workshop ========== */
.workshop-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  grid-auto-rows: 180px;
  gap: 12px;
}
.workshop-main {
  grid-row: span 2;
  position: relative;
  border-radius: 4px;
  overflow: hidden;
}
.workshop-sub {
  position: relative;
  border-radius: 4px;
  overflow: hidden;
  height: 180px;
  background: var(--gray-100);
}
.workshop-grid img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .6s ease;
}
.workshop-grid > div:hover img { transform: scale(1.06); }
.workshop-cap {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 26px;
  background: linear-gradient(to top, rgba(10,53,89,0.9), transparent);
  color: #fff;
}
.workshop-cap h3 {
  font-size: 22px;
  color: var(--accent-2);
  margin-bottom: 4px;
}
.workshop-cap p {
  margin: 0;
  font-size: 13px;
  color: rgba(255,255,255,0.85);
}

/* ========== Why ========== */
.why-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.why-card {
  background: #fff;
  padding: 40px 32px;
  border-radius: 6px;
  border: 1px solid var(--gray-200);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.why-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 0;
  height: 3px;
  background: var(--accent);
  transition: width .5s ease;
}
.why-card:hover {
  border-color: var(--accent);
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}
.why-card:hover::before { width: 100%; }
.why-num {
  font-size: 42px;
  font-weight: 900;
  color: #d8e7f5;
  line-height: 1;
  margin-bottom: 12px;
  font-family: Georgia, serif;
  letter-spacing: -1px;
}
.why-card:hover .why-num { color: #b9d9ed; }
.why-card h3 {
  font-size: 19px;
  color: var(--primary);
  margin-bottom: 12px;
}
.why-card p {
  font-size: 14px;
  color: var(--gray-600);
  line-height: 1.8;
  margin: 0;
}

/* ========== Process ========== */
.process-list {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 0;
  counter-reset: process;
  position: relative;
}
.process-list::before {
  content: "";
  position: absolute;
  top: 30px;
  left: 8.3%;
  right: 8.3%;
  height: 2px;
  background: var(--gray-200);
  z-index: 0;
}
.process-list li {
  position: relative;
  text-align: center;
  padding: 0 8px;
  z-index: 1;
}
.process-list li span {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 60px;
  height: 60px;
  margin: 0 auto 16px;
  background: #fff;
  border: 2px solid var(--accent);
  color: var(--accent-dark);
  border-radius: 50%;
  font-size: 22px;
  font-weight: 800;
  font-family: Georgia, serif;
  transition: var(--transition);
}
.process-list li:hover span {
  background: var(--accent);
  color: #fff;
  transform: scale(1.08);
}
.process-list li h4 {
  font-size: 16px;
  color: var(--primary);
  margin-bottom: 6px;
}
.process-list li p {
  font-size: 13px;
  color: var(--gray-400);
  margin: 0;
}

/* ========== Contact ========== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 60px;
  align-items: start;
}
.contact-lead {
  font-size: 16px;
  color: var(--gray-600);
  line-height: 1.8;
  margin: 0 0 36px;
}
.contact-list {
  display: flex;
  flex-direction: column;
  gap: 22px;
  margin-bottom: 32px;
}
.contact-list li {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}
.contact-ico {
  width: 48px;
  height: 48px;
  background: var(--light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  flex-shrink: 0;
}
.contact-list strong {
  display: block;
  font-size: 16px;
  color: var(--primary);
  margin-bottom: 4px;
}
.contact-list span {
  font-size: 14px;
  color: var(--gray-600);
}

.contact-form {
  background: var(--light);
  padding: 40px;
  border-radius: 6px;
  box-shadow: var(--shadow-md);
}
.contact-form h3 {
  font-size: 22px;
  color: var(--primary);
  margin-bottom: 24px;
  text-align: center;
  position: relative;
  padding-bottom: 16px;
}
.contact-form h3::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 50px;
  height: 2px;
  background: var(--accent);
}
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}
.contact-form label {
  display: block;
  margin-bottom: 14px;
}
.contact-form label > span {
  display: block;
  font-size: 13px;
  color: var(--gray-600);
  margin-bottom: 6px;
  font-weight: 500;
}
.contact-form em {
  color: #e84c3d;
  font-style: normal;
  margin-left: 2px;
}
.contact-form input,
.contact-form select,
.contact-form textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--gray-200);
  border-radius: 4px;
  font-size: 14px;
  background: #fff;
  transition: var(--transition);
  color: var(--text);
}
.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(37,150,209,0.15);
}
.contact-form textarea { resize: vertical; min-height: 80px; }
.form-tip {
  font-size: 12px;
  color: var(--gray-400);
  text-align: center;
  margin: 12px 0 0;
  line-height: 1.5;
}

/* ========== Footer ========== */
.footer {
  background: var(--primary-2);
  color: rgba(255,255,255,0.7);
  padding: 64px 0 0;
  font-size: 14px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
  gap: 40px;
  padding-bottom: 48px;
}
.footer-logo {
  width: 60px;
  height: 60px;
  border-radius: 6px;
  object-fit: cover;
  margin-bottom: 16px;
  background: linear-gradient(135deg, #0f4c81, #2596d1);
}
.footer-brand p {
  margin: 0;
  line-height: 1.8;
  color: rgba(255,255,255,0.55);
}
.footer h4 {
  color: #fff;
  font-size: 15px;
  margin-bottom: 18px;
  letter-spacing: 1px;
}
.footer ul li {
  margin-bottom: 10px;
  line-height: 1.6;
}
.footer ul a {
  color: rgba(255,255,255,0.6);
  transition: var(--transition);
}
.footer ul a:hover { color: var(--accent-2); }
.footer-contact li { color: rgba(255,255,255,0.65); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding: 20px 0;
  text-align: center;
  font-size: 12px;
  color: rgba(255,255,255,0.4);
}
.footer-bottom p { margin: 0; }

/* ========== Lightbox ========== */
.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.92);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 24px;
  animation: fadeIn .3s;
}
.lightbox.show { display: flex; }
.lightbox img {
  max-width: 92%;
  max-height: 90vh;
  object-fit: contain;
  border-radius: 4px;
  animation: zoomIn .3s;
}
.lightbox-close {
  position: absolute;
  top: 24px;
  right: 32px;
  width: 44px;
  height: 44px;
  background: rgba(255,255,255,0.1);
  color: #fff;
  border-radius: 50%;
  font-size: 28px;
  font-weight: 300;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}
.lightbox-close:hover {
  background: var(--accent);
  transform: rotate(90deg);
}
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes zoomIn { from { opacity: 0; transform: scale(.9); } to { opacity: 1; transform: scale(1); } }

/* ========== Back to top ========== */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  background: var(--accent);
  color: #fff;
  border-radius: 50%;
  font-size: 22px;
  font-weight: 700;
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 99;
  box-shadow: var(--shadow-md);
  transition: var(--transition);
}
.back-to-top.show { display: flex; }
.back-to-top:hover {
  background: var(--accent-dark);
  transform: translateY(-4px);
}

/* ========== City Stations 城市分站 ========== */
.city-featured {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 56px;
}
.city-featured-item {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 28px 30px;
  background: var(--light);
  border-radius: 6px;
  border-left: 4px solid var(--accent);
  transition: var(--transition);
}
.city-featured-item:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}
.city-pin {
  font-size: 32px;
  flex-shrink: 0;
}
.city-featured-item h4 {
  font-size: 17px;
  color: var(--primary);
  margin-bottom: 4px;
}
.city-featured-item p {
  margin: 0;
  font-size: 13.5px;
  color: var(--gray-600);
  line-height: 1.6;
}

.city-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  margin-bottom: 48px;
}
.city-group {
  background: #fff;
  border: 1px solid var(--gray-200);
  border-radius: 6px;
  padding: 28px 24px;
  transition: var(--transition);
}
.city-group:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-sm);
}
.city-region {
  font-size: 16px;
  color: var(--primary);
  margin-bottom: 18px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--light);
  font-weight: 700;
}
.city-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px 12px;
}
.city-list li {
  font-size: 13.5px;
  color: var(--gray-600);
  padding: 6px 0;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
  padding-left: 14px;
}
.city-list li a {
  display: block;
  color: inherit;
  text-decoration: none;
}
.city-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--gray-200);
  transition: var(--transition);
}
.city-list li:hover,
.city-list li a:hover {
  color: var(--accent-dark);
  font-weight: 600;
}
.city-list li:hover::before {
  background: var(--accent);
  width: 7px;
  height: 7px;
}

.city-cta {
  text-align: center;
  padding: 40px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-2) 100%);
  border-radius: 6px;
  color: #fff;
}
.city-cta p {
  font-size: 16px;
  margin: 0 0 20px;
  color: rgba(255,255,255,0.9);
}
.city-cta .btn-primary {
  background: var(--accent);
}
.city-cta .btn-primary:hover {
  background: var(--accent-dark);
}

/* ========== Scroll Reveal ========== */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity .8s ease, transform .8s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ========== Responsive ========== */
@media (max-width: 1024px) {
  .product-grid { grid-template-columns: repeat(3, 1fr); }
  .case-grid { grid-template-columns: repeat(3, 1fr); }
  .why-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1.5fr 1fr 1fr; }
  .footer-grid > div:last-child { grid-column: span 3; }
  .workshop-grid { grid-template-columns: 1fr 1fr 1fr 1fr; }
  .process-list { grid-template-columns: repeat(3, 1fr); gap: 28px 0; }
  .process-list::before { display: none; }
  .city-featured { grid-template-columns: 1fr; }
  .city-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .topbar { font-size: 12px; }
  .topbar-right { display: none; }
  .nav-menu {
    position: fixed;
    top: 76px;
    right: -100%;
    width: 80%;
    max-width: 320px;
    height: calc(100vh - 76px);
    background: #fff;
    flex-direction: column;
    align-items: stretch;
    padding: 24px;
    box-shadow: -10px 0 30px rgba(0,0,0,0.1);
    transition: right .35s ease;
    gap: 0;
  }
  .nav-menu.open { right: 0; }
  .nav-link {
    padding: 14px 16px;
    border-bottom: 1px solid var(--gray-200);
  }
  .nav-link.active::after { display: none; }
  .nav-cta {
    margin: 16px 0 0;
    text-align: center;
  }
  .menu-toggle { display: flex; }
  .menu-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .menu-toggle.active span:nth-child(2) { opacity: 0; }
  .menu-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

  .hero { min-height: 80vh; }
  .hero-content { padding: 80px 24px; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); gap: 20px; }
  .bar-strip-inner { grid-template-columns: repeat(2, 1fr); }
  .bar-item { border-right: none; }
  .bar-item:nth-child(odd) { border-right: 1px solid var(--gray-200); }
  .bar-item:nth-child(-n+2) { border-bottom: 1px solid var(--gray-200); }

  .section { padding: 60px 0; }
  .about-grid, .contact-grid { grid-template-columns: 1fr; gap: 40px; }
  .about-img-main { height: 360px; }
  .about-img-sub { width: 45%; height: 160px; left: 12px; bottom: -10px; }
  .about-exp { width: 100px; height: 100px; transform: translate(10%, -10%); }
  .about-exp-num { font-size: 32px; }

  .product-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .product-img { height: 180px; }
  .case-grid { grid-template-columns: repeat(2, 1fr); }
  .case-item { height: 180px; }
  .workshop-grid { grid-template-columns: 1fr 1fr; grid-auto-rows: 140px; }
  .workshop-main { grid-row: span 1; }
  .workshop-main img { height: 100%; }
  .why-grid { grid-template-columns: 1fr; gap: 16px; }
  .process-list { grid-template-columns: repeat(2, 1fr); }

  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .footer-grid > div:last-child { grid-column: span 2; }
  .city-grid { grid-template-columns: 1fr; }
  .city-list { grid-template-columns: 1fr 1fr; }

  .contact-form { padding: 28px 20px; }
  .form-row { grid-template-columns: 1fr; }

  .back-to-top { bottom: 16px; right: 16px; width: 40px; height: 40px; }
}

@media (max-width: 480px) {
  .product-grid { grid-template-columns: 1fr; }
  .case-grid { grid-template-columns: 1fr; }
  .workshop-grid { grid-template-columns: 1fr; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-grid > div:last-child { grid-column: auto; }
  .bar-strip-inner { grid-template-columns: 1fr; }
  .bar-item { border-right: none !important; border-bottom: 1px solid var(--gray-200); }
  .bar-item:last-child { border-bottom: none; }
  .process-list { grid-template-columns: 1fr; }
}