/* =============================================
   三文鱼围挡 - 全站样式表
   ============================================= */

/* ---- 变量 & 重置 ---- */
:root {
  --primary: #1a3a6b;       /* 深海军蓝 */
  --primary-light: #2563eb; /* 亮蓝 */
  --accent: #f97316;        /* 活力橙 */
  --accent-dark: #ea6c0a;
  --dark: #0f172a;
  --text: #1e293b;
  --text-light: #64748b;
  --bg-light: #f8fafc;
  --bg-dark: #0f172a;
  --white: #ffffff;
  --border: #e2e8f0;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.12);
  --radius: 12px;
  --radius-sm: 8px;
  --transition: 0.3s ease;
}

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

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  color: var(--text);
  background: var(--white);
  line-height: 1.7;
  overflow-x: hidden;
}

a { text-decoration: none; color: inherit; transition: var(--transition); }
img { max-width: 100%; display: block; }
ul { list-style: none; }

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---- 导航栏 ---- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(15, 23, 42, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  transition: var(--transition);
}

.site-header.scrolled {
  background: rgba(15, 23, 42, 0.97);
  box-shadow: 0 2px 20px rgba(0,0,0,0.3);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--white);
  letter-spacing: 0.5px;
}

.logo-icon { font-size: 1.5rem; }

.main-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.main-nav a {
  color: rgba(255, 255, 255, 0.75);
  padding: 8px 18px;
  border-radius: 6px;
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 0.3px;
  transition: var(--transition);
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--white);
  background: rgba(255, 255, 255, 0.1);
}

.main-nav a.active {
  color: var(--accent);
}

/* 移动端菜单按钮 */
.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}

.mobile-menu-btn span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--white);
  border-radius: 2px;
  transition: var(--transition);
}

.mobile-menu {
  display: none;
  position: fixed;
  top: 68px;
  left: 0;
  right: 0;
  background: rgba(15, 23, 42, 0.98);
  padding: 16px 24px 24px;
  z-index: 999;
  border-top: 1px solid rgba(255,255,255,0.06);
  flex-direction: column;
  gap: 4px;
}

.mobile-menu.open { display: flex; }

.mobile-menu a {
  color: rgba(255,255,255,0.8);
  padding: 12px 16px;
  border-radius: 8px;
  font-size: 1.05rem;
  transition: var(--transition);
}

.mobile-menu a:hover,
.mobile-menu a.active {
  background: rgba(255,255,255,0.08);
  color: var(--accent);
}

/* ---- Hero 首屏 ---- */
.hero {
  position: relative;
  height: 100vh;
  min-height: 640px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(135deg, #0f2744 0%, #1a3a6b 40%, #0f2744 100%);
  background-image:
    radial-gradient(ellipse at 20% 50%, rgba(37, 99, 235, 0.35) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 30%, rgba(249, 115, 22, 0.2) 0%, transparent 50%),
    radial-gradient(ellipse at 60% 80%, rgba(37, 99, 235, 0.2) 0%, transparent 50%),
    linear-gradient(135deg, #0f2744 0%, #1a3a6b 40%, #0f2744 100%);
  animation: heroGradientShift 12s ease-in-out infinite alternate;
}

@keyframes heroGradientShift {
  0%   { filter: brightness(1) saturate(1); }
  100% { filter: brightness(1.08) saturate(1.1); }
}

/* 网格纹理 */
.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, transparent 40%, rgba(0,0,0,0.4) 100%);
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 0 24px;
  max-width: 820px;
  animation: heroFadeIn 1s ease-out;
}

@keyframes heroFadeIn {
  from { opacity: 0; transform: translateY(30px); }
  to   { opacity: 1; transform: translateY(0); }
}

.hero-badge {
  display: inline-block;
  background: rgba(249, 115, 22, 0.15);
  border: 1px solid rgba(249, 115, 22, 0.4);
  color: #fb923c;
  padding: 6px 18px;
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 1px;
  margin-bottom: 28px;
  animation: heroFadeIn 1s ease-out 0.1s both;
}

.hero-title {
  font-size: clamp(3rem, 7vw, 5.5rem);
  font-weight: 800;
  color: var(--white);
  line-height: 1.1;
  letter-spacing: -1px;
  margin-bottom: 20px;
  animation: heroFadeIn 1s ease-out 0.2s both;
}

.hero-slogan {
  font-size: clamp(1.2rem, 2.5vw, 1.6rem);
  color: rgba(255,255,255,0.9);
  font-weight: 400;
  line-height: 1.6;
  margin-bottom: 16px;
  animation: heroFadeIn 1s ease-out 0.3s both;
}

.hero-sub {
  font-size: 1rem;
  color: rgba(255,255,255,0.55);
  margin-bottom: 40px;
  animation: heroFadeIn 1s ease-out 0.4s both;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  animation: heroFadeIn 1s ease-out 0.5s both;
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent);
  color: var(--white);
  box-shadow: 0 4px 20px rgba(249, 115, 22, 0.4);
}

.btn-primary:hover {
  background: var(--accent-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 28px rgba(249, 115, 22, 0.5);
}

.btn-outline {
  background: transparent;
  color: var(--white);
  border: 1.5px solid rgba(255,255,255,0.4);
}

.btn-outline:hover {
  background: rgba(255,255,255,0.1);
  border-color: rgba(255,255,255,0.7);
  transform: translateY(-2px);
}

.btn-lg { padding: 16px 40px; font-size: 1.05rem; }

.hero-scroll-hint {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  text-align: center;
  color: rgba(255,255,255,0.4);
  font-size: 0.8rem;
  letter-spacing: 1px;
  animation: heroFadeIn 1s ease-out 0.8s both;
}

.scroll-arrow {
  width: 24px;
  height: 24px;
  margin: 8px auto 0;
  border-right: 2px solid rgba(255,255,255,0.3);
  border-bottom: 2px solid rgba(255,255,255,0.3);
  transform: rotate(45deg);
  animation: scrollBounce 2s ease-in-out infinite;
}

@keyframes scrollBounce {
  0%, 100% { transform: rotate(45deg) translateY(0); opacity: 0.4; }
  50%       { transform: rotate(45deg) translateY(6px); opacity: 0.7; }
}

/* ---- 通用区块 ---- */
.section { padding: 96px 0; }

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-tag {
  display: inline-block;
  background: rgba(249, 115, 22, 0.1);
  color: var(--accent);
  padding: 4px 16px;
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 800;
  color: var(--dark);
  line-height: 1.2;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-light);
  max-width: 560px;
  margin: 0 auto;
}

.section-header.light .section-tag { background: rgba(249, 115, 22, 0.2); }
.section-header.light .section-title { color: var(--white); }
.section-header.light .section-desc { color: rgba(255,255,255,0.6); }

/* ---- 核心优势 ---- */
.features { background: var(--bg-light); }

.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 36px 28px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  transition: var(--transition);
  text-align: center;
}

.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(249, 115, 22, 0.3);
}

.feature-icon {
  font-size: 2.4rem;
  margin-bottom: 20px;
  line-height: 1;
}

.feature-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 12px;
}

.feature-card p {
  font-size: 0.92rem;
  color: var(--text-light);
  line-height: 1.7;
}

/* ---- 产品预览 ---- */
.section-dark { background: var(--bg-dark); }

.product-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
  margin-bottom: 48px;
}

.product-card {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
}

.product-card:hover {
  border-color: rgba(249, 115, 22, 0.4);
  transform: translateY(-4px);
  box-shadow: 0 8px 32px rgba(0,0,0,0.3);
}

.product-img {
  height: 240px;
  overflow: hidden;
}

.product-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}

.product-card:hover .product-img img { transform: scale(1.05); }

.product-info {
  padding: 28px;
}

.product-info h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 10px;
}

.product-info p {
  font-size: 0.92rem;
  color: rgba(255,255,255,0.6);
  line-height: 1.7;
  margin-bottom: 18px;
}

.product-link {
  color: var(--accent);
  font-weight: 600;
  font-size: 0.95rem;
}

.product-link:hover { color: #fb923c; }

.center-btn { text-align: center; }

/* ---- 服务流程 ---- */
.process { background: var(--white); }

.process-steps {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 0;
  flex-wrap: wrap;
}

.step {
  flex: 1;
  min-width: 180px;
  text-align: center;
  padding: 0 20px;
}

.step-num {
  font-size: 2.8rem;
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 16px;
  opacity: 0.8;
}

.step h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 10px;
}

.step p {
  font-size: 0.88rem;
  color: var(--text-light);
  line-height: 1.7;
}

.step-arrow {
  font-size: 1.5rem;
  color: var(--border);
  padding-top: 20px;
  flex-shrink: 0;
}

/* ---- CTA ---- */
.cta-section { padding: 80px 0; background: var(--bg-light); }

.cta-box {
  background: linear-gradient(135deg, var(--primary) 0%, #2563eb 100%);
  border-radius: 20px;
  padding: 64px 48px;
  text-align: center;
  box-shadow: var(--shadow-lg);
}

.cta-box h2 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 800;
  color: var(--white);
  margin-bottom: 12px;
}

.cta-box p {
  font-size: 1.05rem;
  color: rgba(255,255,255,0.75);
  margin-bottom: 36px;
}

/* ---- 页脚 ---- */
.site-footer {
  background: var(--dark);
  color: rgba(255,255,255,0.7);
  padding: 64px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.8fr 1fr 1fr 1.4fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 16px;
}

.footer-brand p {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.5);
  line-height: 1.7;
}

.footer-col h4 {
  color: var(--white);
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 20px;
  letter-spacing: 0.5px;
}

.footer-col a,
.footer-col p {
  display: block;
  font-size: 0.9rem;
  color: rgba(255,255,255,0.55);
  margin-bottom: 12px;
  transition: var(--transition);
}

.footer-col a:hover { color: var(--accent); }

.footer-bottom {
  padding: 24px 0;
  text-align: center;
  font-size: 0.82rem;
  color: rgba(255,255,255,0.35);
  border-top: 1px solid rgba(255,255,255,0.05);
}

.footer-bottom a { color: rgba(255,255,255,0.4); }
.footer-bottom a:hover { color: var(--accent); }

/* =============================================
   响应式
   ============================================= */
@media (max-width: 1024px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .main-nav { display: none; }
  .mobile-menu-btn { display: flex; }

  .section { padding: 64px 0; }
  .features-grid { grid-template-columns: 1fr; gap: 16px; }
  .product-cards { grid-template-columns: 1fr; }
  .process-steps { flex-direction: column; align-items: center; gap: 24px; }
  .step-arrow { display: none; }
  .step { width: 100%; max-width: 400px; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .cta-box { padding: 48px 24px; }
  .hero-actions { flex-direction: column; gap: 12px; }
  .hero-actions .btn { width: 240px; }
}

@media (max-width: 480px) {
  .hero-title { letter-spacing: -0.5px; }
  .footer-grid { gap: 24px; }
}