/* ============================================
   陕西亚瑞斯环保工程有限公司 - 官网样式
   ============================================ */

/* ---- 变量定义 ---- */
:root {
  /* 主色 */
  --color-primary: #0a4b8c;
  --color-primary-dark: #063566;
  --color-primary-light: #1a6ab8;

  /* 强调色 - 青绿/环保色 */
  --color-accent: #00b894;
  --color-accent-dark: #008e70;
  --color-accent-light: #55e6c1;

  /* 辅助色 */
  --color-warm: #f39c12;
  --color-danger: #e74c3c;

  /* 中性色 */
  --color-text: #2c3e50;
  --color-text-light: #5a6c7d;
  --color-text-muted: #8a9ba8;
  --color-border: #e1e8ed;
  --color-bg: #ffffff;
  --color-bg-gray: #f5f8fa;
  --color-bg-dark: #0a1d30;
  --color-bg-darker: #061018;

  /* 字体 */
  --font-sans: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-serif: 'Noto Serif SC', Georgia, 'Times New Roman', serif;

  /* 间距 */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;
  --spacing-2xl: 8rem;

  /* 半径 */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 20px;

  /* 阴影 */
  --shadow-sm: 0 2px 8px rgba(10, 75, 140, 0.06);
  --shadow-md: 0 4px 20px rgba(10, 75, 140, 0.1);
  --shadow-lg: 0 10px 40px rgba(10, 75, 140, 0.15);
  --shadow-xl: 0 20px 60px rgba(10, 75, 140, 0.2);

  /* 过渡 */
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

/* ---- 基础重置 ---- */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-sans);
  font-weight: 400;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

ul, ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
  outline: none;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.3;
}

/* ---- 通用类 ---- */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

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

.section-header {
  margin-bottom: var(--spacing-lg);
}

.section-header.center {
  text-align: center;
}

.section-header.center .section-line {
  margin-left: auto;
  margin-right: auto;
}

.section-eyebrow {
  display: inline-block;
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 3px;
  color: var(--color-accent);
  margin-bottom: var(--spacing-xs);
  text-transform: uppercase;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--spacing-sm);
  font-family: var(--font-serif);
}

.section-line {
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  border-radius: 2px;
  margin-bottom: var(--spacing-sm);
}

.section-desc {
  font-size: 1.0625rem;
  color: var(--color-text-light);
  max-width: 600px;
  margin: 0 auto;
}

.section-header.light .section-title {
  color: #fff;
}

.section-header.light .section-eyebrow {
  color: var(--color-accent-light);
}

/* ---- 按钮 ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 32px;
  font-size: 1rem;
  font-weight: 500;
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  cursor: pointer;
  border: 2px solid transparent;
  white-space: nowrap;
}

.btn-icon {
  width: 18px;
  height: 18px;
  transition: transform var(--transition-base);
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: #fff;
  box-shadow: 0 4px 15px rgba(10, 75, 140, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(10, 75, 140, 0.4);
}

.btn-primary:hover .btn-icon {
  transform: translateX(3px);
}

.btn-outline {
  background: transparent;
  color: #fff;
  border-color: rgba(255, 255, 255, 0.4);
}

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

.btn-block {
  width: 100%;
}

/* ---- 导航栏 ---- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  transition: all var(--transition-base);
  background: transparent;
}

.navbar.scrolled {
  background: rgba(6, 16, 24, 0.95);
  backdrop-filter: blur(20px);
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

.nav-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 32px;
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-mark {
  width: 44px;
  height: 44px;
  color: var(--color-accent);
  flex-shrink: 0;
}

.logo-mark svg {
  width: 100%;
  height: 100%;
}

.nav-logo-img {
  width: 44px;
  height: 44px;
  object-fit: contain;
  flex-shrink: 0;
}

.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.logo-cn {
  font-size: 1.125rem;
  font-weight: 700;
  color: #fff;
  font-family: var(--font-serif);
  letter-spacing: 1px;
}

.logo-en {
  font-size: 0.6875rem;
  color: rgba(255, 255, 255, 0.6);
  letter-spacing: 1.5px;
  text-transform: uppercase;
}

.nav-menu {
  display: flex;
  gap: 4px;
  align-items: center;
}

.nav-link {
  padding: 8px 18px;
  font-size: 0.9375rem;
  font-weight: 400;
  color: rgba(255, 255, 255, 0.85);
  position: relative;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width var(--transition-base);
  border-radius: 1px;
}

.nav-link:hover,
.nav-link.active {
  color: #fff;
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 24px;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: all var(--transition-base);
}

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

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 1.5s ease-in-out;
  z-index: 0;
}

.hero-slide.active {
  opacity: 1;
  z-index: 1;
}

.hero-slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  z-index: 2;
  background: linear-gradient(
    135deg,
    rgba(6, 16, 24, 0.75) 0%,
    rgba(10, 75, 140, 0.5) 50%,
    rgba(0, 184, 148, 0.25) 100%
  );
}

.hero-content {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
  padding: 120px 32px 80px;
  color: #fff;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 20px;
  background: rgba(0, 184, 148, 0.15);
  border: 1px solid rgba(0, 184, 148, 0.4);
  border-radius: 100px;
  font-size: 0.875rem;
  color: var(--color-accent-light);
  margin-bottom: 32px;
  backdrop-filter: blur(10px);
}

.badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-accent);
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(1.2); }
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 28px;
  font-family: var(--font-serif);
}

.title-line {
  display: block;
}

.title-line.accent {
  background: linear-gradient(135deg, #fff 0%, var(--color-accent-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.125rem;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 48px;
  max-width: 600px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 80px;
}

.hero-stats {
  display: flex;
  align-items: center;
  gap: 48px;
  flex-wrap: wrap;
}

.stat-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.stat-num {
  font-size: 2.25rem;
  font-weight: 800;
  font-family: var(--font-serif);
  color: #fff;
  line-height: 1;
}

.stat-label {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.6);
  letter-spacing: 0.5px;
}

.stat-divider {
  width: 1px;
  height: 48px;
  background: rgba(255, 255, 255, 0.2);
}

.hero-scroll {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.75rem;
  letter-spacing: 2px;
  z-index: 1;
}

.scroll-line {
  width: 1px;
  height: 48px;
  background: linear-gradient(to bottom, rgba(255, 255, 255, 0.6), transparent);
  position: relative;
  overflow: hidden;
}

.scroll-line::after {
  content: '';
  position: absolute;
  top: -12px;
  left: 0;
  width: 1px;
  height: 12px;
  background: var(--color-accent);
  animation: scroll-down 2s ease-in-out infinite;
}

@keyframes scroll-down {
  0% { top: -12px; }
  100% { top: 100%; }
}

/* ---- 关于我们 ---- */
.about {
  background: var(--color-bg);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.about-heading {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 20px;
  font-family: var(--font-serif);
}

.about-desc {
  font-size: 1rem;
  color: var(--color-text-light);
  line-height: 1.9;
  margin-bottom: 20px;
}

.about-features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-top: 40px;
}

.feature-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.feature-icon {
  width: 48px;
  height: 48px;
  flex-shrink: 0;
  background: linear-gradient(135deg, rgba(10, 75, 140, 0.1), rgba(0, 184, 148, 0.1));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
}

.feature-icon svg {
  width: 22px;
  height: 22px;
}

.feature-content h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 4px;
}

.feature-content p {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.about-image {
  position: relative;
}

.img-frame {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  aspect-ratio: 4/5;
}

.img-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.img-corner {
  position: absolute;
  width: 32px;
  height: 32px;
  border: 3px solid var(--color-accent);
}

.img-corner.tl { top: 16px; left: 16px; border-right: none; border-bottom: none; }
.img-corner.tr { top: 16px; right: 16px; border-left: none; border-bottom: none; }
.img-corner.bl { bottom: 16px; left: 16px; border-right: none; border-top: none; }
.img-corner.br { bottom: 16px; right: 16px; border-left: none; border-top: none; }

.about-card {
  position: absolute;
  bottom: -30px;
  left: -30px;
  background: #fff;
  padding: 24px 28px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  display: flex;
  gap: 20px;
  align-items: center;
  max-width: 320px;
}

.card-year {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-right: 20px;
  border-right: 2px solid var(--color-border);
}

.year-num {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--color-primary);
  font-family: var(--font-serif);
  line-height: 1;
}

.year-text {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-top: 4px;
  white-space: nowrap;
}

.card-info h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 6px;
}

.card-info p {
  font-size: 0.8125rem;
  color: var(--color-text-light);
  line-height: 1.6;
}

/* ---- 核心业务 ---- */
.business {
  background: var(--color-bg-gray);
}

.business-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.business-card {
  background: #fff;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-slow);
  border: 1px solid var(--color-border);
}

.business-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
  border-color: var(--color-accent-light);
}

.card-image {
  position: relative;
  height: 240px;
  overflow: hidden;
}

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

.business-card:hover .card-image img {
  transform: scale(1.08);
}

.card-number {
  position: absolute;
  top: 20px;
  right: 20px;
  font-size: 3rem;
  font-weight: 800;
  font-family: var(--font-serif);
  color: rgba(255, 255, 255, 0.3);
  line-height: 1;
}

.card-body {
  padding: 32px;
}

.card-icon {
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  margin-bottom: 20px;
}

.card-icon svg {
  width: 28px;
  height: 28px;
}

.card-title {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 14px;
  font-family: var(--font-serif);
}

.card-desc {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  line-height: 1.8;
  margin-bottom: 20px;
}

.card-list {
  margin-bottom: 20px;
}

.card-list li {
  position: relative;
  padding-left: 20px;
  font-size: 0.875rem;
  color: var(--color-text-light);
  line-height: 2;
}

.card-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
}

.card-clients {
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.card-clients span:last-child {
  color: var(--color-primary);
  font-weight: 500;
}

.card-scenes {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.scene-tag {
  padding: 4px 12px;
  background: rgba(0, 184, 148, 0.1);
  color: var(--color-accent-dark);
  font-size: 0.75rem;
  border-radius: 100px;
  font-weight: 500;
}

/* ---- 产品中心 ---- */
.products {
  background: var(--color-bg);
}

.products-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.product-card {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 36px;
  border: 1px solid var(--color-border);
  position: relative;
  transition: all var(--transition-base);
  overflow: hidden;
}

.product-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s ease;
}

.product-card:hover {
  border-color: var(--color-accent-light);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.product-card:hover::before {
  transform: scaleX(1);
}

.product-badge {
  display: inline-block;
  padding: 4px 14px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: #fff;
  font-size: 0.75rem;
  font-weight: 500;
  border-radius: 100px;
  margin-bottom: 20px;
}

.product-badge.accent {
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-light));
}

.product-badge.warm {
  background: linear-gradient(135deg, #e67e22, #f39c12);
}

.product-badge.cool {
  background: linear-gradient(135deg, #2c3e50, #3498db);
}

.product-header {
  margin-bottom: 20px;
}

.product-name {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 6px;
  font-family: var(--font-serif);
}

.product-model {
  font-size: 0.875rem;
  color: var(--color-primary);
  font-weight: 500;
  font-family: 'Courier New', monospace;
  letter-spacing: 0.5px;
}

.product-spec {
  background: var(--color-bg-gray);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  margin-bottom: 20px;
}

.spec-item {
  display: flex;
  justify-content: space-between;
  padding: 6px 0;
}

.spec-item + .spec-item {
  border-top: 1px solid rgba(0, 0, 0, 0.05);
}

.spec-label {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.spec-value {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text);
}

.product-desc {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  line-height: 1.8;
  margin-bottom: 20px;
}

.product-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.product-tags span {
  padding: 4px 12px;
  background: rgba(10, 75, 140, 0.08);
  color: var(--color-primary);
  font-size: 0.75rem;
  border-radius: 4px;
  font-weight: 500;
}

/* ---- 项目案例 ---- */
.cases {
  background: var(--color-bg-gray);
}

.cases-intro {
  max-width: 700px;
  margin-bottom: 48px;
}

.cases-intro p {
  font-size: 1.0625rem;
  color: var(--color-text-light);
  line-height: 1.9;
}

.clients-logos {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 24px;
  margin-bottom: 64px;
}

.client-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 28px 16px;
  background: #fff;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  transition: all var(--transition-base);
}

.client-item:hover {
  border-color: var(--color-accent-light);
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}

.client-logo {
  width: 64px;
  height: 64px;
  color: var(--color-primary);
  opacity: 0.7;
  transition: all var(--transition-base);
}

.client-item:hover .client-logo {
  opacity: 1;
  color: var(--color-accent);
}

.client-logo svg {
  width: 100%;
  height: 100%;
}

.client-name {
  font-size: 0.8125rem;
  color: var(--color-text-light);
  text-align: center;
}

.case-highlights {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.highlight-item {
  padding: 36px;
  background: #fff;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  transition: all var(--transition-base);
}

.highlight-item:hover {
  box-shadow: var(--shadow-lg);
  border-color: var(--color-accent-light);
}

.highlight-icon {
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, rgba(0, 184, 148, 0.15), rgba(10, 75, 140, 0.1));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
  margin-bottom: 24px;
}

.highlight-icon svg {
  width: 30px;
  height: 30px;
}

.highlight-item h4 {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 12px;
  font-family: var(--font-serif);
}

.highlight-item p {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  line-height: 1.8;
}

/* ---- 企业文化 ---- */
.culture {
  position: relative;
  color: #fff;
  overflow: hidden;
}

.culture-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.culture-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.culture-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(6, 16, 24, 0.95) 0%,
    rgba(10, 75, 140, 0.85) 50%,
    rgba(0, 142, 112, 0.8) 100%
  );
}

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

.culture-philosophy {
  text-align: center;
  margin-bottom: 64px;
}

.philosophy-main {
  display: inline-block;
  padding: 40px 60px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-xl);
  position: relative;
}

.philosophy-main::before,
.philosophy-main::after {
  content: '';
  position: absolute;
  width: 24px;
  height: 24px;
  border: 2px solid var(--color-accent);
}

.philosophy-main::before {
  top: -2px;
  left: -2px;
  border-right: none;
  border-bottom: none;
}

.philosophy-main::after {
  bottom: -2px;
  right: -2px;
  border-left: none;
  border-top: none;
}

.philosophy-label {
  display: block;
  font-size: 0.875rem;
  color: var(--color-accent-light);
  letter-spacing: 3px;
  margin-bottom: 16px;
  text-transform: uppercase;
}

.philosophy-text {
  font-size: 2.5rem;
  font-weight: 700;
  font-family: var(--font-serif);
  letter-spacing: 8px;
  background: linear-gradient(135deg, #fff, var(--color-accent-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

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

.culture-card {
  padding: 36px 28px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  text-align: center;
  backdrop-filter: blur(10px);
  transition: all var(--transition-base);
}

.culture-card:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(0, 184, 148, 0.4);
  transform: translateY(-6px);
}

.culture-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 20px;
  color: var(--color-accent-light);
}

.culture-icon svg {
  width: 100%;
  height: 100%;
}

.culture-card h4 {
  font-size: 1.125rem;
  font-weight: 600;
  color: #fff;
  margin-bottom: 12px;
  font-family: var(--font-serif);
}

.culture-card p {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.8;
}

/* ---- 服务保障 ---- */
.service {
  background: var(--color-bg);
}

.service-flow {
  display: flex;
  align-items: stretch;
  justify-content: space-between;
  gap: 16px;
}

.flow-item {
  flex: 1;
  text-align: center;
  padding: 32px 24px;
}

.flow-step {
  position: relative;
  width: 88px;
  height: 88px;
  margin: 0 auto 24px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  box-shadow: 0 8px 24px rgba(10, 75, 140, 0.25);
}

.step-num {
  position: absolute;
  top: -8px;
  right: -8px;
  width: 32px;
  height: 32px;
  background: var(--color-accent);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 3px solid var(--color-bg);
}

.step-icon {
  width: 36px;
  height: 36px;
}

.step-icon svg {
  width: 100%;
  height: 100%;
}

.flow-item h4 {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 10px;
  font-family: var(--font-serif);
}

.flow-item p {
  font-size: 0.875rem;
  color: var(--color-text-light);
  line-height: 1.7;
}

.flow-arrow {
  display: flex;
  align-items: center;
  color: var(--color-accent);
  opacity: 0.5;
  padding-top: 44px;
}

.flow-arrow svg {
  width: 24px;
  height: 24px;
}

/* ---- 发展方向 ---- */
.vision {
  background: var(--color-bg-gray);
  padding: var(--spacing-xl) 0;
}

.vision-box {
  position: relative;
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
  border-radius: var(--radius-xl);
  padding: 60px 64px;
  overflow: hidden;
  display: flex;
  align-items: center;
}

.vision-content {
  flex: 1;
  color: #fff;
  position: relative;
  z-index: 1;
  max-width: 680px;
}

.vision-title {
  font-size: 2rem;
  font-weight: 700;
  color: #fff;
  margin: 12px 0 20px;
  font-family: var(--font-serif);
}

.vision-desc {
  font-size: 1rem;
  line-height: 1.9;
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: 28px;
}

.vision-fields {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.field-item {
  padding: 8px 20px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 100px;
  backdrop-filter: blur(10px);
}

.field-tag {
  font-size: 0.875rem;
  font-weight: 500;
  color: #fff;
}

.vision-decoration {
  position: absolute;
  right: -80px;
  top: 50%;
  transform: translateY(-50%);
  width: 400px;
  height: 400px;
}

.deco-circle {
  position: absolute;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.deco-circle.c1 {
  width: 400px;
  height: 400px;
  top: 0;
  left: 0;
}

.deco-circle.c2 {
  width: 300px;
  height: 300px;
  top: 50px;
  left: 50px;
  border-color: rgba(0, 184, 148, 0.2);
}

.deco-circle.c3 {
  width: 200px;
  height: 200px;
  top: 100px;
  left: 100px;
  border-color: rgba(0, 184, 148, 0.3);
}

/* ---- 联系我们 ---- */
.contact {
  background: var(--color-bg);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 64px;
  align-items: start;
  justify-items: start;
}

.contact-info {
  width: 100%;
  max-width: 720px;
  text-align: left;
}

.contact-list {
  width: 100%;
  text-align: left;
}

.contact-title {
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--color-text);
  margin: 12px 0 16px;
  font-family: var(--font-serif);
}

.contact-subtitle {
  font-size: 1rem;
  color: var(--color-text-light);
  line-height: 1.8;
  margin-bottom: 40px;
}

.contact-list {
  margin-bottom: 40px;
}

.contact-item {
  display: flex;
  gap: 16px;
  padding: 20px 0;
  border-bottom: 1px solid var(--color-border);
}

.contact-item:first-child {
  padding-top: 0;
}

.contact-icon {
  width: 48px;
  height: 48px;
  flex-shrink: 0;
  background: linear-gradient(135deg, rgba(10, 75, 140, 0.1), rgba(0, 184, 148, 0.1));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
}

.contact-icon svg {
  width: 22px;
  height: 22px;
}

.contact-text h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 4px;
}

.contact-text p {
  font-size: 0.9375rem;
  color: var(--color-text-light);
}

.contact-branches h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 16px;
}

.branches-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.branch-tag {
  padding: 6px 16px;
  background: var(--color-bg-gray);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-size: 0.8125rem;
  color: var(--color-text-light);
  transition: all var(--transition-fast);
}

.branch-tag:hover {
  border-color: var(--color-accent);
  color: var(--color-accent-dark);
}

.branch-tag.dim {
  opacity: 0.6;
  font-style: italic;
}

.contact-form-box {
  background: #fff;
  border-radius: var(--radius-xl);
  padding: 40px;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-border);
}

.contact-form-box h3 {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 8px;
  font-family: var(--font-serif);
}

.form-tip {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: 28px;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-group label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text);
}

.form-group input,
.form-group select,
.form-group textarea {
  padding: 12px 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  color: var(--color-text);
  background: var(--color-bg);
  transition: all var(--transition-fast);
  width: 100%;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(0, 184, 148, 0.1);
}

.form-group textarea {
  resize: vertical;
  min-height: 100px;
  font-family: inherit;
}

.contact-form .btn {
  margin-top: 8px;
}

/* ---- 页脚 ---- */
.footer {
  background: var(--color-bg-darker);
  color: #fff;
  padding: 64px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
}

.footer-logo .logo-mark {
  color: var(--color-accent);
}

.footer-logo-img {
  width: 48px;
  height: 48px;
  object-fit: contain;
  flex-shrink: 0;
}

.footer-slogan {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-accent-light);
  letter-spacing: 3px;
  margin-bottom: 16px;
  font-family: var(--font-serif);
}

.footer-desc {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.6);
  line-height: 1.8;
}

.footer-links h4,
.footer-contact h4 {
  font-size: 1rem;
  font-weight: 600;
  color: #fff;
  margin-bottom: 20px;
  font-family: var(--font-serif);
}

.footer-links ul,
.footer-contact ul {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-links a {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.6);
  transition: all var(--transition-fast);
}

.footer-links a:hover {
  color: var(--color-accent-light);
  padding-left: 4px;
}

.footer-contact li {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.6);
  display: flex;
  gap: 4px;
  line-height: 1.6;
}

.fc-label {
  color: rgba(255, 255, 255, 0.8);
  flex-shrink: 0;
}

.footer-bottom {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 20px 0;
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.4);
  text-align: center;
}

.footer-icp {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-icp a {
  color: rgba(255, 255, 255, 0.4);
  transition: color var(--transition-fast);
}

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

/* ---- 返回顶部 ---- */
.back-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition-base);
  z-index: 999;
}

.back-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-top:hover {
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-light));
  transform: translateY(-4px);
}

.back-top svg {
  width: 20px;
  height: 20px;
}

/* ---- 滚动动画 ---- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---- 响应式设计 ---- */
@media (max-width: 1024px) {
  .section {
    padding: var(--spacing-xl) 0;
  }

  .section-title {
    font-size: 2rem;
  }

  .about-grid,
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .about-image {
    max-width: 500px;
    margin: 0 auto;
  }

  .business-grid,
  .products-grid {
    grid-template-columns: 1fr;
  }

  .clients-logos {
    grid-template-columns: repeat(3, 1fr);
  }

  .case-highlights {
    grid-template-columns: 1fr;
  }

  .culture-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .service-flow {
    flex-wrap: wrap;
    justify-content: center;
  }

  .flow-arrow {
    display: none;
  }

  .flow-item {
    flex: 0 0 45%;
  }

  .vision-box {
    padding: 48px 36px;
  }

  .vision-decoration {
    display: none;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

@media (max-width: 768px) {
  .nav-container {
    padding: 0 20px;
    height: 64px;
  }

  .nav-toggle {
    display: flex;
    z-index: 1001;
  }

  .nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: var(--color-bg-darker);
    flex-direction: column;
    padding: 80px 24px 24px;
    gap: 8px;
    transition: right var(--transition-base);
    box-shadow: -4px 0 20px rgba(0, 0, 0, 0.3);
  }

  .nav-menu.open {
    right: 0;
  }

  .nav-link {
    padding: 12px 16px;
    font-size: 1rem;
    width: 100%;
    border-radius: var(--radius-sm);
  }

  .nav-link::after {
    display: none;
  }

  .nav-link.active {
    background: rgba(0, 184, 148, 0.15);
    color: var(--color-accent-light);
  }

  .nav-toggle.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .nav-toggle.active span:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  .hero-content {
    padding: 100px 20px 60px;
  }

  .hero-stats {
    gap: 24px;
  }

  .stat-item {
    flex: 0 0 calc(50% - 12px);
  }

  .stat-divider {
    display: none;
  }

  .section {
    padding: 4rem 0;
  }

  .section-title {
    font-size: 1.75rem;
  }

  .about-features {
    grid-template-columns: 1fr;
  }

  .about-card {
    left: 16px;
    right: 16px;
    bottom: -20px;
    max-width: none;
  }

  .clients-logos {
    grid-template-columns: repeat(2, 1fr);
  }

  .culture-grid {
    grid-template-columns: 1fr;
  }

  .philosophy-text {
    font-size: 1.5rem;
    letter-spacing: 4px;
  }

  .philosophy-main {
    padding: 28px 36px;
  }

  .flow-item {
    flex: 0 0 100%;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .contact-form-box {
    padding: 28px 24px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }

  .back-top {
    bottom: 20px;
    right: 20px;
    width: 42px;
    height: 42px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 2rem;
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
  }

  .btn {
    width: 100%;
  }

  .hero-stats {
    gap: 20px;
  }

  .stat-num {
    font-size: 1.75rem;
  }

  .vision-box {
    padding: 36px 24px;
    border-radius: var(--radius-lg);
  }

  .vision-title {
    font-size: 1.5rem;
  }
}