/* =====================================================
   江苏鼎宏船舶设备安装工程有限公司全站样式
   设计主题：精密安装·海上工匠
   ===================================================== */

:root {
  --color-primary: #455A64;           /* 机械灰 */
  --color-primary-dark: #263238;      /* 深灰 */
  --color-secondary: #0277BD;         /* 船舶蓝 */
  --color-secondary-dark: #015C91;
  --color-accent: #FF6F00;            /* 警示橙 */
  --color-accent-light: #FF8F1F;
  --color-surface: #FFFFFF;
  --color-surface-alt: #F2F4F7;
  --color-panel: #E1E6EB;
  --color-line: #CBD2D9;
  --color-muted: #8A9BA8;
  --color-text: #263238;
  --color-text-light: #546574;
  --gradient-hero: linear-gradient(120deg, rgba(38,50,56,0.95), rgba(21,33,42,0.8));
  --gradient-panel: linear-gradient(135deg, rgba(69,90,100,0.95), rgba(38,50,56,0.95));

  --font-sans: 'Source Han Sans SC', 'Microsoft YaHei', 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'IBM Plex Mono', 'Courier New', monospace;

  --space-xs: 0.4rem;
  --space-sm: 0.8rem;
  --space-md: 1.2rem;
  --space-lg: 2rem;
  --space-xl: 3.2rem;
  --space-2xl: 4.8rem;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-full: 999px;

  --shadow-sm: 0 6px 20px rgba(14, 22, 30, 0.08);
  --shadow-md: 0 18px 40px rgba(10, 18, 30, 0.18);
  --shadow-lg: 0 28px 60px rgba(8, 12, 18, 0.35);

  --transition-fast: 160ms ease;
  --transition-base: 280ms ease;
}

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

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: radial-gradient(circle at top, #E1EBF4 0%, #CBD8E4 35%, #F5F6F7 100%);
  min-height: 100vh;
  line-height: 1.7;
  letter-spacing: 0.2px;
}

img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
}

main {
  overflow: hidden;
}

.container {
  width: min(1200px, 92vw);
  margin: 0 auto;
}

.section {
  padding: var(--space-2xl) 0;
  position: relative;
}

.section--tight {
  padding: var(--space-xl) 0;
}

.section--mesh {
  background: radial-gradient(circle at left, rgba(69, 90, 100, 0.08) 0%, transparent 45%),
              radial-gradient(circle at right, rgba(2, 119, 189, 0.08) 0%, transparent 50%),
              var(--color-surface);
}

.section--dark {
  background: #141B23;
  color: #E0E6EC;
}

.section--panel {
  background: var(--color-surface-alt);
}

.section-header {
  max-width: 720px;
  margin-bottom: var(--space-xl);
}

.section-header h2 {
  font-size: clamp(2rem, 3.5vw, 2.8rem);
  color: var(--color-primary-dark);
  margin-bottom: var(--space-sm);
}

.section-header p {
  color: var(--color-text-light);
  font-size: 1rem;
}

.eyebrow {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.3rem;
  color: var(--color-muted);
  margin-bottom: var(--space-xs);
}

.lead {
  font-size: 1.15rem;
  color: var(--color-text-light);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.85rem 1.6rem;
  border-radius: var(--radius-full, 999px);
  background: var(--color-secondary);
  color: white;
  font-weight: 600;
  text-decoration: none;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
}

.btn:hover {
  transform: translateY(-3px);
  background: var(--color-secondary-dark);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.5);
  color: white;
}

.btn-outline-dark {
  border: 1px solid var(--color-line);
  color: var(--color-primary-dark);
  background: transparent;
}

.btn-outline-dark:hover {
  background: rgba(2, 119, 189, 0.08);
  color: var(--color-secondary);
}

/* 导航 */
.navbar {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(9, 14, 20, 0.92);
  backdrop-filter: blur(18px);
  padding: 0.6rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: white;
  font-weight: 700;
  letter-spacing: 0;
  text-decoration: none;
  flex-wrap: wrap;
  line-height: 1.3;
  max-width: 320px;
}

.navbar-brand span {
  font-size: 1rem;
  letter-spacing: 0.08rem;
}

.navbar-menu {
  list-style: none;
  display: flex;
  gap: 1.2rem;
}

.navbar-link {
  color: #DEE4EA;
  font-size: 0.95rem;
  font-weight: 500;
  text-decoration: none;
  position: relative;
  padding: 0.4rem 0.2rem;
}

.navbar-link::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width var(--transition-fast);
}

.navbar-link:hover::after {
  width: 100%;
}

.navbar-item {
  position: relative;
}

.dropdown-menu {
  position: absolute;
  top: calc(100% + 0.4rem);
  left: 0;
  background: rgba(9, 14, 20, 0.95);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  padding: 0.8rem 0;
  list-style: none;
  min-width: 200px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  pointer-events: none;
  transition: opacity var(--transition-fast), transform var(--transition-fast), visibility var(--transition-fast);
  z-index: 5;
}

.dropdown-item {
  display: block;
  padding: 0.5rem 1.2rem;
  color: #D7DFE7;
  font-size: 0.9rem;
}

.dropdown-item:hover {
  background: rgba(255,255,255,0.05);
}

.navbar-item.dropdown.is-open > .dropdown-menu,
.navbar-item.dropdown:focus-within > .dropdown-menu,
.navbar-item.dropdown:hover > .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  pointer-events: auto;
}

/* 英雄区 */
.hero-industrial {
  position: relative;
  padding: 5rem 0 4rem;
  background: radial-gradient(circle at 20% 20%, rgba(2, 119, 189, 0.15), transparent 40%),
              url('../images/shipyard-overview.jpg') center/cover;
  color: white;
}

.hero-industrial::after {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-hero);
}

.hero-industrial .container {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2.5rem;
  align-items: center;
}

.hero-industrial__content h1 {
  font-size: clamp(2.8rem, 4.8vw, 4rem);
  margin-bottom: var(--space-md);
}

.hero-industrial__content p {
  color: rgba(255,255,255,0.85);
}

.hero-ctas {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-top: var(--space-md);
}

.hero-media {
  position: relative;
  padding: 1.5rem;
  border-radius: var(--radius-lg);
  background: rgba(14, 21, 30, 0.6);
  border: 1px solid rgba(255,255,255,0.15);
  box-shadow: var(--shadow-lg);
}

.hero-media img {
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1rem;
  margin-top: var(--space-lg);
}

.hero-metric {
  padding: 1rem 0;
  border-top: 1px solid rgba(255,255,255,0.2);
}

.hero-metric strong {
  display: block;
  font-size: 1.8rem;
  color: white;
}

.hero-metric span {
  font-size: 0.95rem;
  color: rgba(255,255,255,0.7);
}

.hero-gear {
  position: absolute;
  top: -40px;
  right: -40px;
  width: 120px;
  height: 120px;
  border-radius: 50%;
  border: 12px solid rgba(255,255,255,0.15);
  animation: gear-spin 18s linear infinite;
  opacity: 0.4;
}

/* 卡片与网格 */
.grid {
  display: grid;
  gap: 1.8rem;
}

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}

.card {
  border-radius: var(--radius-md);
  background: var(--color-surface);
  border: 1px solid var(--color-panel);
  padding: 1.6rem;
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

.card-body {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.card::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  border: 1px solid transparent;
  background: linear-gradient(120deg, rgba(255,255,255,0.2), rgba(255,255,255,0));
  opacity: 0;
  transition: opacity var(--transition-base);
  pointer-events: none;
}

.card:hover::after {
  opacity: 1;
}

.card-dark {
  background: var(--gradient-panel);
  color: white;
  border-color: transparent;
}

.service-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.2rem;
}

.service-card {
  padding: 1.6rem;
  border-radius: var(--radius-md);
  border: 1px solid rgba(69,90,100,0.25);
  background: linear-gradient(160deg, rgba(255,255,255,0.95), rgba(236,240,244,0.9));
  box-shadow: var(--shadow-sm);
  position: relative;
}

.service-card span {
  display: inline-flex;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: rgba(2,119,189,0.15);
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  margin-bottom: 0.8rem;
  color: var(--color-secondary);
}

.service-card strong {
  display: block;
  color: var(--color-primary-dark);
  font-size: 1.1rem;
}

.steel-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}

.steel-panel {
  padding: 2rem;
  border-radius: var(--radius-md);
  background: linear-gradient(160deg, #F9FBFC, #E9EEF2);
  border: 1px solid var(--color-panel);
}

.data-panel {
  background: #0E141B;
  color: #E8ECF1;
  padding: 2rem;
  border-radius: var(--radius-md);
  border: 1px solid rgba(255,255,255,0.1);
  box-shadow: var(--shadow-lg);
}

.data-panel h3 {
  color: white;
}

.list-panel {
  display: flex;
  flex-direction: column;
}

.list-panel ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.list-panel li {
  padding: 0.6rem 0;
  border-bottom: 1px solid rgba(69,90,100,0.15);
}

.project-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
}

.project-card {
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-panel);
  background: var(--color-surface);
  box-shadow: var(--shadow-sm);
}

.project-card img {
  border-radius: 0;
  height: 180px;
  object-fit: cover;
}

.project-card .project-body {
  padding: 1.3rem;
}

.certification-stack {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.2rem;
}

.certificate-card {
  border-radius: var(--radius-md);
  padding: 1.5rem;
  border: 1px dashed rgba(69,90,100,0.35);
  background: #fff;
  min-height: 180px;
}

.process-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1rem;
}

.process-step {
  padding: 1.5rem;
  text-align: center;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-panel);
  background: #fff;
}

.process-step span {
  display: inline-flex;
  width: 38px;
  height: 38px;
  border-radius: 10px;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: var(--color-secondary);
  background: rgba(2,119,189,0.15);
  margin-bottom: 0.6rem;
}

/* 页面顶部横幅 */
.page-hero {
  position: relative;
  padding: 4rem 0;
  background-size: cover;
  background-position: center;
  color: white;
}

.page-hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, rgba(11,22,30,0.95), rgba(38,50,56,0.88));
}

.page-hero .container {
  position: relative;
  z-index: 1;
}

.page-hero h1 {
  font-size: clamp(2.2rem, 3vw, 3rem);
  margin-bottom: var(--space-sm);
}

.page-hero p {
  max-width: 640px;
  color: rgba(255,255,255,0.82);
}

.breadcrumb {
  margin-top: var(--space-sm);
  font-size: 0.9rem;
  color: rgba(255,255,255,0.7);
}

.page-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: var(--space-lg);
}

.page-toolbar .filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.filter-chip {
  padding: 0.3rem 0.9rem;
  border-radius: 999px;
  border: 1px solid var(--color-panel);
  background: white;
  font-size: 0.9rem;
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
}

.info-block {
  padding: 1.6rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-panel);
  background: var(--color-surface);
}

.stat-board {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
}

.stat {
  padding: 1rem;
  border-radius: var(--radius-md);
  background: rgba(2,119,189,0.06);
  border: 1px solid rgba(2,119,189,0.2);
}

.stat strong {
  display: block;
  font-size: 1.6rem;
  color: var(--color-secondary);
}

.timeline {
  position: relative;
  padding-left: 2rem;
  border-left: 2px solid var(--color-panel);
}

.timeline__step {
  margin-bottom: 2rem;
  position: relative;
}

.timeline__step::before {
  content: '';
  position: absolute;
  left: -2.3rem;
  top: 0.4rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-secondary);
  box-shadow: 0 0 0 6px rgba(2,119,189,0.15);
}

.case-highlight {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  align-items: center;
}

.case-meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
}

.case-meta div {
  padding: 1rem;
  border-radius: var(--radius-md);
  background: #F7F9FB;
  border: 1px solid var(--color-panel);
}

.news-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
}

.news-card {
  border-radius: var(--radius-md);
  padding: 1.5rem;
  background: var(--color-surface);
  border: 1px solid var(--color-panel);
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.news-card span {
  font-size: 0.9rem;
  color: var(--color-muted);
}

.career-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}

.career-card {
  border: 1px solid var(--color-panel);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  background: var(--color-surface);
}

.benefit-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}

.benefit-list li {
  list-style: none;
  padding: 0.9rem 1rem;
  background: #F7F9FC;
  border-radius: var(--radius-sm);
  border: 1px dashed rgba(69,90,100,0.3);
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
}

.contact-card {
  padding: 1.5rem;
  border-radius: var(--radius-md);
  border: 1px solid rgba(255,255,255,0.1);
  background: rgba(255,255,255,0.05);
}

.partner-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
}

.partner-grid div {
  padding: 1.2rem;
  border-radius: var(--radius-md);
  border: 1px solid rgba(255,255,255,0.2);
  text-align: center;
}

.table {
  width: 100%;
  border-collapse: collapse;
  border: 1px solid var(--color-panel);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.table th,
.table td {
  padding: 0.9rem 1rem;
  border-bottom: 1px solid var(--color-panel);
}

.table th {
  background: #EEF2F6;
  text-align: left;
}

/* 页脚 */
footer {
  background: #0C1117;
  color: rgba(255,255,255,0.8);
  padding: 3rem 0 2rem;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
}

.footer-section h4 {
  margin-bottom: 1rem;
  color: white;
}

.footer-section ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.footer-section a {
  color: rgba(255,255,255,0.7);
  text-decoration: none;
}

.footer-bottom {
  margin-top: 2rem;
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 1.2rem;
  font-size: 0.9rem;
}

/* 响应式 */
@media (max-width: 1024px) {
  .navbar-menu {
    flex-wrap: wrap;
    justify-content: flex-end;
  }

  .hero-industrial .container {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .navbar .container {
    flex-direction: column;
    gap: 0.8rem;
  }

  .navbar-menu {
    justify-content: center;
  }

  .page-toolbar {
    flex-direction: column;
    align-items: flex-start;
  }

  .hero-ctas {
    width: 100%;
  }

  .process-steps, .project-gallery, .service-grid, .steel-grid, .career-grid, .news-list, .info-grid {
    grid-template-columns: 1fr;
  }
}

/* 动画 */
@keyframes gear-spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}