/* ============================
   layout.css - 导航栏、Hero、各板块布局
   ============================ */

/* --- 导航栏 --- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--nav-height);
  z-index: 1000;
  transition: background var(--transition), box-shadow var(--transition);
}
.navbar.scrolled {
  background: rgba(255,255,255,0.98);
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(12px);
}
.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-white);
  transition: color var(--transition);
}
.navbar.scrolled .nav-logo {
  color: var(--text-primary);
}
.nav-logo img {
  height: 36px;
  width: auto;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}
.nav-links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: rgba(255,255,255,0.85);
  transition: color var(--transition);
  position: relative;
}
.navbar.scrolled .nav-links a {
  color: var(--text-secondary);
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--text-white);
}
.navbar.scrolled .nav-links a:hover,
.navbar.scrolled .nav-links a.active {
  color: var(--primary);
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width var(--transition);
}
.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}
.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-white);
  transition: all var(--transition);
  border-radius: 2px;
}
.navbar.scrolled .hamburger span {
  background: var(--text-primary);
}
.hamburger.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.hamburger.active span:nth-child(2) {
  opacity: 0;
}
.hamburger.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* 移动端侧栏 */
.mobile-menu {
  display: none;
  position: fixed;
  top: var(--nav-height);
  right: -100%;
  width: 280px;
  height: calc(100vh - var(--nav-height));
  background: var(--bg-white);
  box-shadow: var(--shadow-xl);
  transition: right var(--transition);
  z-index: 999;
  padding: 24px;
  flex-direction: column;
  gap: 0;
}
.mobile-menu.open {
  right: 0;
}
.mobile-menu a {
  display: block;
  padding: 14px 0;
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border-light);
}
.mobile-menu a:hover {
  color: var(--primary);
}
.mobile-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  z-index: 998;
  opacity: 0;
  transition: opacity var(--transition);
}
.mobile-overlay.show {
  opacity: 1;
}

/* --- Hero 首屏 --- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg,
    #010916 0%,
    #02101e 12%,
    #031728 24%,
    #041d32 36%,
    #052238 48%,
    #06243c 55%,
    #051f35 62%,
    #04182c 72%,
    #031224 82%,
    #020c1a 92%,
    #010814 100%
  );
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: 0;
  opacity: 0.2;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.5'/%3E%3C/svg%3E");
  background-size: 200px 200px;
  pointer-events: none;
}
.hero-particles {
  position: absolute;
  inset: 0;
  z-index: 0;
  display: block;
  width: 100%;
  height: 100%;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 120% 120% at 50% 50%,
      transparent 0%,
      transparent 15%,
      rgba(0,0,0,0.03) 25%,
      rgba(0,0,0,0.08) 35%,
      rgba(0,0,0,0.15) 45%,
      rgba(0,0,0,0.25) 55%,
      rgba(0,0,0,0.38) 65%,
      rgba(0,0,0,0.52) 75%,
      rgba(0,0,0,0.68) 85%,
      rgba(0,0,0,0.82) 92%,
      rgba(0,0,0,0.9) 100%
    );
  z-index: 1;
  pointer-events: none;
}
.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  color: var(--text-white);
  max-width: 800px;
  padding: 0 24px;
}
.hero-badge {
  display: inline-block;
  padding: 6px 20px;
  border-radius: 100px;
  background: rgba(255,255,255,0.15);
  backdrop-filter: blur(10px);
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 24px;
  border: 1px solid rgba(255,255,255,0.2);
}
.hero h1 {
  font-size: 3.2rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 20px;
}
.hero p {
  font-size: 1.2rem;
  opacity: 0.9;
  margin-bottom: 36px;
  line-height: 1.7;
}
.hero-buttons {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 56px;
}
.hero-stats {
  display: flex;
  justify-content: center;
  gap: 48px;
  flex-wrap: wrap;
}
.hero-stat {
  text-align: center;
}
.hero-stat .number {
  display: block;
  font-size: 2rem;
  font-weight: 700;
}
.hero-stat .label {
  font-size: 0.85rem;
  opacity: 0.8;
}

/* --- 关于我们 --- */
.about {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}
.about-text h2 {
  font-size: 2rem;
  margin-bottom: 8px;
}
.about-text .section-tag {
  display: inline-block;
  color: var(--primary);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 1px;
}
.about-text p {
  color: var(--text-secondary);
  margin-bottom: 20px;
  line-height: 1.8;
}
.about-features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 32px;
}
.about-feature {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 16px;
  background: var(--bg-gray);
  border-radius: var(--radius-md);
}
.about-feature-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: var(--primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 1.2rem;
}
.about-feature h4 {
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 4px;
}
.about-feature p {
  font-size: 0.8rem;
  color: var(--text-light);
  margin: 0;
}
.about-image {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.about-image img {
  width: 100%;
  height: 400px;
  object-fit: cover;
  border-radius: var(--radius-lg);
}
.about-image::after {
  content: '';
  position: absolute;
  bottom: 0;
  right: 0;
  width: 200px;
  height: 200px;
  background: var(--primary-gradient);
  opacity: 0.1;
  border-radius: var(--radius-lg) 0 0 0;
}

/* --- 产品板块 --- */
.products-tabs {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}
.products-tab {
  padding: 10px 28px;
  border-radius: 100px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--bg-white);
  border: 2px solid var(--border);
  transition: all var(--transition);
  cursor: pointer;
}
.products-tab:hover {
  border-color: var(--primary);
  color: var(--primary);
}
.products-tab.active {
  background: var(--primary);
  color: var(--text-white);
  border-color: var(--primary);
}

.product-panel {
  display: none;
}
.product-panel.active {
  display: block;
  animation: fadeIn 0.4s ease;
}
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 24px;
}

.product-card {
  background: var(--bg-white);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  overflow: hidden;
  transition: all var(--transition);
}
.product-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
  border-color: var(--primary);
}

.product-card-image {
  width: 100%;
  height: 180px;
  background: var(--primary-light);
  overflow: hidden;
}
.product-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.product-card-body {
  padding: 24px;
}
.product-card-body h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--text-primary);
}
.product-card-body .product-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
  line-height: 1.6;
}
.product-highlights {
  margin-bottom: 16px;
}
.product-highlights li {
  position: relative;
  padding-left: 20px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
  line-height: 1.5;
}
.product-highlights li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 7px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--primary);
}

.product-toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary);
  cursor: pointer;
  padding: 6px 0;
  border: none;
  background: none;
  transition: gap var(--transition);
}
.product-toggle:hover {
  gap: 10px;
}
.product-toggle .arrow {
  transition: transform var(--transition);
  font-size: 0.7rem;
}
.product-toggle.expanded .arrow {
  transform: rotate(180deg);
}

.product-detail {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.5s ease;
}
.product-detail.open {
  max-height: 800px;
}
.product-detail-inner {
  padding: 16px 0 0;
  border-top: 1px solid var(--border-light);
  margin-top: 12px;
}
.product-detail-inner h4 {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}
.product-detail-inner p,
.product-detail-inner li {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.7;
}
.product-detail-inner ul {
  padding-left: 16px;
  list-style: disc;
}
.product-detail-inner ul li {
  margin-bottom: 4px;
}

/* --- 案例板块 --- */
.cases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.case-card {
  background: var(--bg-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: all var(--transition);
}
.case-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}
.case-card-image {
  width: 100%;
  height: 200px;
  background: var(--primary-light);
  overflow: hidden;
}
.case-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.case-card-body {
  padding: 20px;
}
.case-card-body h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 8px;
}
.case-card-body p {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 12px;
}
.case-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}
.case-tags .tag {
  font-size: 0.7rem;
}

/* --- 联系我们 --- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}
.contact-info {
  display: flex;
  flex-direction: column;
  gap: 24px;
}
.contact-info h2 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 8px;
}
.contact-info > p {
  color: var(--text-secondary);
  line-height: 1.7;
}
.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
}
.contact-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: var(--primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 1.1rem;
}
.contact-item h4 {
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 4px;
}
.contact-item p {
  font-size: 0.85rem;
  color: var(--text-secondary);
}
.contact-image {
  border-radius: var(--radius-lg);
  overflow: hidden;
  height: 360px;
}
.contact-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* --- 页脚 --- */
.footer {
  background: var(--bg-dark);
  color: rgba(255,255,255,0.7);
  padding: 64px 0 32px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}
.footer-brand p {
  font-size: 0.85rem;
  line-height: 1.7;
  margin-top: 12px;
}
.footer-brand .nav-logo {
  color: var(--text-white);
  font-size: 1.1rem;
}
.footer-col h4 {
  color: var(--text-white);
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 16px;
}
.footer-col a {
  display: block;
  font-size: 0.85rem;
  color: rgba(255,255,255,0.6);
  padding: 5px 0;
  transition: color var(--transition);
}
.footer-col a:hover {
  color: var(--accent);
}
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  color: rgba(255,255,255,0.4);
}
.footer-bottom a {
  color: rgba(255,255,255,0.4);
}
.footer-bottom a:hover {
  color: var(--accent);
}