/* ===== 深蓝瑞驰 官方网站 - 样式表 ===== */

:root {
  --primary: #0a3d6b;
  --primary-light: #1a6ba8;
  --primary-dark: #072a4a;
  --accent: #0099cc;
  --accent-light: #33bbee;
  --ocean-light: #e8f4fd;
  --ocean-gradient: linear-gradient(135deg, #0a3d6b 0%, #1a6ba8 50%, #0099cc 100%);
  --dark: #1a1a2e;
  --text: #333333;
  --text-light: #666666;
  --white: #ffffff;
  --light-bg: #f8faff;
  --gold: #c9a96e;
  --gold-light: #f0e4c8;
  --shadow: 0 4px 20px rgba(10, 61, 107, 0.1);
  --shadow-lg: 0 10px 40px rgba(10, 61, 107, 0.15);
  --radius: 12px;
  --radius-lg: 20px;
  --transition: all 0.3s ease;
  --font-serif: 'SimSun', '宋体', STSong, 'Noto Serif SC', serif;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

/* 标题使用宋体 */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; height: auto; display: block; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

.section-title {
  text-align: center;
  margin-bottom: 50px;
}
.section-title h2 {
  font-size: 2.2rem;
  color: var(--primary-dark);
  margin-bottom: 15px;
  position: relative;
  display: inline-block;
}
.section-title h2::after {
  content: '';
  display: block;
  width: 60px;
  height: 3px;
  background: var(--gold);
  margin: 12px auto 0;
}
.section-title p {
  color: var(--text-light);
  font-size: 1.05rem;
  max-width: 600px;
  margin: 0 auto;
}

/* ===== Header / Nav ===== */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(10px);
  box-shadow: 0 2px 20px rgba(0,0,0,0.06);
  transition: var(--transition);
}
header.scrolled {
  box-shadow: 0 2px 30px rgba(0,0,0,0.1);
}
nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  height: 70px;
  max-width: 1200px;
  margin: 0 auto;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--primary);
}
.logo-img {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  object-fit: cover;
}
.nav-links {
  display: flex;
  gap: 30px;
}
.nav-links a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text);
  padding: 8px 0;
  position: relative;
  transition: var(--transition);
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: var(--transition);
}
.nav-links a:hover, .nav-links a.active { color: var(--primary-light); }
.nav-links a:hover::after, .nav-links a.active::after { width: 100%; }
.hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 5px; }
.hamburger span { width: 25px; height: 2px; background: var(--primary); border-radius: 2px; transition: var(--transition); }

/* ===== Hero Section ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  padding-top: 70px;
}

/* Hero Background Video */
.hero-bg-video {
  position: absolute;
  top: 50%;
  left: 50%;
  min-width: 100%;
  min-height: 100%;
  width: auto;
  height: auto;
  z-index: 1;
  transform: translate(-50%, -50%);
  object-fit: cover;
}

/* Hero Overlay for better text readability */
.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 2;
  background: linear-gradient(135deg, rgba(10, 61, 107, 0.75) 0%, rgba(26, 107, 168, 0.65) 50%, rgba(0, 153, 204, 0.55) 100%);
}

.hero::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  z-index: 3;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1440 320'%3E%3Cpath fill='%23ffffff' fill-opacity='0.05' d='M0,96L48,112C96,128,192,160,288,186.7C384,213,480,235,576,213.3C672,192,768,128,864,128C960,128,1056,192,1152,208C1248,224,1344,192,1392,176L1440,160L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z'/%3E%3C/svg%3E") bottom no-repeat;
  background-size: cover;
  opacity: 0.3;
}

.hero-text {
  position: relative;
  z-index: 4;
  text-align: center;
  padding: 80px 20px;
  max-width: 900px;
  margin: 0 auto;
}
.hero-text h1 {
  font-size: 3.2rem;
  font-weight: 800;
  color: var(--white);
  line-height: 1.2;
  margin-bottom: 20px;
}
.hero-text h1 span {
  display: block;
  color: var(--gold-light);
  font-size: 1.6rem;
  font-weight: 400;
  margin-top: 5px;
}
.hero-text p {
  font-size: 1.15rem;
  color: rgba(255,255,255,0.85);
  margin-bottom: 35px;
  line-height: 1.8;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}
.hero-badges {
  display: flex;
  gap: 15px;
  flex-wrap: wrap;
  justify-content: center;
}
.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  background: rgba(255,255,255,0.15);
  border: 1px solid rgba(255,255,255,0.25);
  border-radius: 50px;
  color: white;
  font-size: 0.85rem;
  font-weight: 500;
  backdrop-filter: blur(5px);
}

.hero-cover-img {
  width: 100%;
  max-width: 540px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  transform: perspective(800px) rotateY(-5deg);
  transition: var(--transition);
}
.hero-cover-img:hover {
  transform: perspective(800px) rotateY(0deg);
}

.hero-float-badge {
  position: absolute;
  padding: 12px 20px;
  background: white;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--primary);
  animation: float 3s ease-in-out infinite;
}
.hero-float-badge:nth-child(2) { top: 10%; right: -10%; }
.hero-float-badge:nth-child(3) { bottom: 15%; left: -10%; animation-delay: 1.5s; }

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 50px;
  font-size: 1rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: var(--transition);
}
.btn-primary {
  background: var(--white);
  color: var(--primary);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}
.btn-outline {
  background: transparent;
  border: 2px solid var(--white);
  color: var(--white);
}
.btn-outline:hover {
  background: var(--white);
  color: var(--primary);
  transform: translateY(-2px);
}
.btn-accent {
  background: var(--accent);
  color: var(--white);
}
.btn-accent:hover {
  background: var(--primary-light);
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0,153,204,0.3);
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

/* ===== Features Strip ===== */
.features-strip {
  background: var(--white);
  padding: 30px 0;
  border-bottom: 1px solid #eef4f8;
}
.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.feature-item {
  text-align: center;
  padding: 20px;
}
.feature-icon {
  font-size: 2rem;
  margin-bottom: 10px;
}
.feature-item h4 {
  font-size: 1rem;
  color: var(--primary);
  margin-bottom: 5px;
}
.feature-item p {
  font-size: 0.85rem;
  color: var(--text-light);
}

/* ===== About Section ===== */
.about-section {
  padding: 100px 0;
  background: var(--white);
}
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.about-image {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  cursor: pointer;
}
.about-image img {
  width: 100%;
  height: auto;
  max-height: 500px;
  object-fit: contain;
  transition: transform 0.3s ease;
}
.about-image:hover img {
  transform: scale(1.02);
}
.about-image .play-badge {
  position: absolute;
  bottom: 20px;
  left: 20px;
  background: rgba(0,0,0,0.7);
  color: white;
  padding: 10px 20px;
  border-radius: 50px;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 8px;
  backdrop-filter: blur(5px);
}
.about-text h3 {
  font-size: 1.8rem;
  color: var(--primary-dark);
  margin-bottom: 20px;
}
.about-text p {
  color: var(--text-light);
  margin-bottom: 20px;
  line-height: 1.8;
}
.about-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 30px;
}
.stat-item {
  text-align: center;
  padding: 15px;
  background: var(--light-bg);
  border-radius: var(--radius);
}
.stat-number {
  font-size: 2rem;
  font-weight: 800;
  color: var(--primary);
}
.stat-label {
  font-size: 0.85rem;
  color: var(--text-light);
  margin-top: 5px;
}

/* ===== Products Section ===== */
.products-section {
  padding: 100px 0;
  background: var(--light-bg);
}
.products-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 30px;
}
.product-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
}
.product-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}
.product-image {
  height: 280px;
  overflow: hidden;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--ocean-light);
}
.product-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}
.product-card:hover .product-image img {
  transform: scale(1.05);
}
.product-tag {
  position: absolute;
  top: 15px;
  left: 15px;
  padding: 6px 14px;
  background: var(--gold);
  color: var(--white);
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 600;
}
.product-info {
  padding: 25px;
}
.product-info h3 {
  font-size: 1.3rem;
  color: var(--primary-dark);
  margin-bottom: 10px;
}
.product-info .price {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 10px;
}
.product-info p {
  color: var(--text-light);
  font-size: 0.9rem;
  line-height: 1.7;
  margin-bottom: 15px;
}
.product-highlights {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 15px;
}
.product-highlights span {
  padding: 4px 12px;
  background: var(--ocean-light);
  color: var(--primary);
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 500;
}
.product-link {
  color: var(--accent);
  font-weight: 600;
  font-size: 0.9rem;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  transition: var(--transition);
}
.product-link:hover { gap: 10px; }

/* ===== Ship Section ===== */
.ship-section {
  padding: 100px 0;
  background: var(--primary-dark);
  color: var(--white);
  position: relative;
  overflow: hidden;
}
.ship-section::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: linear-gradient(135deg, rgba(0,0,0,0.3) 0%, transparent 100%);
}
.ship-content {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
  align-items: center;
}
.ship-info h2 {
  font-size: 2.2rem;
  margin-bottom: 20px;
}
.ship-info h2 span { color: var(--gold-light); }
.ship-info p {
  color: rgba(255,255,255,0.8);
  line-height: 1.8;
  margin-bottom: 15px;
}
.ship-features {
  margin-top: 20px;
}
.ship-features li {
  padding: 10px 0;
  border-bottom: 1px solid rgba(255,255,255,0.1);
  display: flex;
  align-items: center;
  gap: 10px;
  color: rgba(255,255,255,0.85);
}
.ship-features li:last-child { border: none; }
.ship-features li::before {
  content: '⚓';
  color: var(--gold);
}

/* ===== Certifications ===== */
.cert-section {
  padding: 80px 0;
  background: var(--white);
}
.cert-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 20px;
  align-items: center;
}
.cert-item {
  text-align: center;
  padding: 20px;
}
.cert-item img {
  max-width: 100px;
  margin: 0 auto 10px;
  height: 100px;
  object-fit: contain;
  cursor: pointer;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.cert-item img:hover {
  transform: scale(1.1);
  box-shadow: 0 4px 15px rgba(10,61,107,0.3);
}
.cert-item p {
  font-size: 0.85rem;
  color: var(--text-light);
  font-weight: 500;
}

/* ===== Science Section ===== */
.science-section {
  padding: 100px 0;
  background: var(--light-bg);
}
.science-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}
.science-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 35px;
  box-shadow: var(--shadow);
  transition: var(--transition);
  text-align: center;
}
.science-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}
.science-icon {
  font-size: 2.5rem;
  margin-bottom: 15px;
}
.science-card h3 {
  color: var(--primary-dark);
  margin-bottom: 12px;
  font-size: 1.2rem;
}
.science-card p {
  color: var(--text-light);
  font-size: 0.9rem;
  line-height: 1.7;
}

/* ===== CTA Section ===== */
.cta-section {
  padding: 80px 0;
  background: var(--ocean-gradient);
  text-align: center;
  position: relative;
}
.cta-section h2 {
  font-size: 2.2rem;
  color: var(--white);
  margin-bottom: 15px;
}
.cta-section p {
  color: rgba(255,255,255,0.85);
  margin-bottom: 30px;
  font-size: 1.1rem;
}
.cta-buttons {
  display: flex;
  gap: 15px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ===== Contact Page ===== */
.contact-section {
  padding: 140px 0 100px;
  background: var(--light-bg);
}
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
}
.contact-info h2 {
  font-size: 2rem;
  color: var(--primary-dark);
  margin-bottom: 20px;
}
.contact-info > p {
  color: var(--text-light);
  margin-bottom: 35px;
}
.contact-details {
  display: flex;
  flex-direction: column;
  gap: 25px;
}
.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 15px;
}
.contact-icon {
  width: 50px;
  height: 50px;
  background: var(--ocean-light);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.contact-icon svg {
  display: block;
}
.contact-item h4 {
  color: var(--primary-dark);
  margin-bottom: 5px;
}
.contact-item p {
  color: var(--text-light);
  font-size: 0.95rem;
}

/* ===== Footer ===== */
footer {
  background: var(--primary-dark);
  color: rgba(255,255,255,0.7);
  padding: 50px 0 20px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-about .logo {
  color: white;
  margin-bottom: 15px;
}
.footer-about p {
  font-size: 0.9rem;
  line-height: 1.7;
}
footer h4 {
  color: white;
  font-size: 1rem;
  margin-bottom: 20px;
}
footer ul li {
  margin-bottom: 10px;
}
footer ul li a {
  font-size: 0.9rem;
  transition: var(--transition);
}
footer ul li a:hover {
  color: var(--accent-light);
}
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 20px;
  text-align: center;
  font-size: 0.85rem;
}

/* ===== Page Hero (inner pages) ===== */
.page-hero {
  padding: 140px 0 60px;
  background: var(--ocean-gradient);
  text-align: center;
  position: relative;
}
.page-hero h1 {
  font-size: 2.5rem;
  color: var(--white);
  margin-bottom: 10px;
}
.page-hero p {
  color: rgba(255,255,255,0.85);
  font-size: 1.1rem;
}

/* ===== Product Detail Page ===== */
.product-detail-section {
  padding: 80px 0;
}
.product-detail-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
  align-items: start;
}
.product-detail-image {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.product-detail-image img {
  width: 100%;
}
.product-detail-info h2 {
  font-size: 2rem;
  color: var(--primary-dark);
  margin-bottom: 15px;
}
.product-detail-info .price {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 20px;
}
.product-detail-info .specs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-bottom: 20px;
}
.spec-item {
  padding: 10px;
  background: var(--light-bg);
  border-radius: 8px;
}
.spec-item strong {
  color: var(--primary);
  font-size: 0.85rem;
  display: block;
  margin-bottom: 3px;
}
.spec-item span {
  color: var(--text-light);
  font-size: 0.9rem;
}
.product-detail-info h3 {
  color: var(--primary-dark);
  margin: 20px 0 10px;
  font-size: 1.1rem;
}
.product-detail-info ul {
  padding-left: 20px;
  margin-bottom: 15px;
}
.product-detail-info ul li {
  list-style: disc;
  color: var(--text-light);
  font-size: 0.9rem;
  line-height: 1.8;
}

/* ===== Science Page ===== */
.research-section {
  padding: 80px 0;
}
.research-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 30px;
  box-shadow: var(--shadow);
  margin-bottom: 25px;
}
.research-card h3 {
  color: var(--primary);
  margin-bottom: 10px;
  font-size: 1.1rem;
}
.research-card p {
  color: var(--text-light);
  font-size: 0.95rem;
  line-height: 1.8;
}
.research-card .source {
  margin-top: 15px;
  padding-top: 12px;
  border-top: 1px dashed #ddd;
  font-size: 0.85rem;
  color: var(--accent);
  font-style: italic;
  background: var(--ocean-light);
  padding: 12px 15px;
  border-radius: 8px;
  line-height: 1.6;
}
.research-card .source::before {
  content: "📚 ";
  font-style: normal;
}

/* ===== Responsive ===== */
@media (max-width: 992px) {
  .hero-text { padding: 60px 20px; }
  .hero-text h1 { font-size: 2.5rem; }
  .hero-text p { margin-left: auto; margin-right: auto; }
  .about-grid { grid-template-columns: 1fr; }
  .products-grid { grid-template-columns: 1fr; }
  .ship-content { grid-template-columns: 1fr; }
  .science-grid { grid-template-columns: 1fr; max-width: 500px; margin: 0 auto; }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .cert-grid { grid-template-columns: repeat(3, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .product-detail-grid { grid-template-columns: 1fr; }
  .hero-float-badge { display: none; }
}

@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: white;
    flex-direction: column;
    padding: 20px;
    gap: 15px;
    box-shadow: var(--shadow);
    transform: translateY(-100%);
    opacity: 0;
    transition: var(--transition);
    pointer-events: none;
  }
  .nav-links.active {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .hamburger { display: flex; }
  .hero-text h1 { font-size: 2rem; }
  .hero-text h1 span { font-size: 1.2rem; }
  .section-title h2 { font-size: 1.8rem; }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .cert-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr; }
  .about-stats { grid-template-columns: repeat(3, 1fr); }
  .stat-number { font-size: 1.5rem; }
}

/* ===== Animations ===== */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}