/* style.css - 鲁品网络官网样式表 */

/* 1. 设计系统与变量定义 */
:root {
  --primary: #2563eb;
  --primary-rgb: 37, 99, 235;
  --primary-hover: #1d4ed8;
  --secondary: #0ea5e9;
  --accent: #10b981;
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --text-main: #0f172a;
  --text-muted: #475569;
  --text-light: #94a3b8;
  --border: #e2e8f0;
  --card-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.05), 0 2px 4px -2px rgb(0 0 0 / 0.05);
  --card-shadow-hover: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --border-radius-sm: 8px;
  --border-radius-md: 16px;
  --border-radius-lg: 24px;
}

/* 暗色主题微调（支持系统自适应） */
@media (prefers-color-scheme: dark) {
  :root {
    --bg-primary: #0b0f19;
    --bg-secondary: #111827;
    --bg-tertiary: #1f2937;
    --text-main: #f9fafb;
    --text-muted: #9ca3af;
    --text-light: #6b7280;
    --border: #374151;
  }
}

/* 2. 基础重置与排版 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

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

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

img, svg {
  max-width: 100%;
  height: auto;
  vertical-align: middle;
}

/* 3. 布局容器 */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 100px 0;
}

.section-bg {
  background-color: var(--bg-secondary);
}

/* 4. 头部导航 */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background-color: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: var(--transition-smooth);
}

@media (prefers-color-scheme: dark) {
  .header {
    background-color: rgba(11, 15, 25, 0.8);
  }
}

.header-scrolled {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 80px;
  transition: var(--transition-smooth);
}

.header-scrolled .nav-container {
  height: 70px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 22px;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: 0.5px;
}

.logo svg {
  color: var(--primary);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 40px;
  list-style: none;
}

.nav-link {
  font-size: 15px;
  font-weight: 500;
  color: var(--text-muted);
  position: relative;
  padding: 8px 0;
}

.nav-link:hover,
.nav-link.active {
  color: var(--primary);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--primary);
  transition: var(--transition-smooth);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.nav-btn {
  background-color: var(--primary);
  color: #ffffff !important;
  padding: 10px 22px;
  border-radius: var(--border-radius-sm);
  font-weight: 600;
  font-size: 14px;
  box-shadow: 0 4px 6px -1px rgba(37, 99, 235, 0.2);
}

.nav-btn:hover {
  background-color: var(--primary-hover);
  transform: translateY(-1px);
}

.mobile-menu-toggle {
  display: none;
  color: var(--text-main);
  background: none;
  border: none;
}

/* 5. 按钮样式 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  font-weight: 600;
  border-radius: var(--border-radius-sm);
  transition: var(--transition-smooth);
  font-size: 15px;
}

.btn-primary {
  background-color: var(--primary);
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.15);
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.25);
}

.btn-secondary {
  background-color: var(--bg-tertiary);
  color: var(--text-main);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  background-color: var(--border);
  transform: translateY(-2px);
}

/* 6. Section Header */
.section-header {
  text-align: center;
  max-width: 600px;
  margin: 0 auto 60px auto;
}

.section-tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  color: var(--primary);
  background-color: rgba(37, 99, 235, 0.08);
  padding: 6px 16px;
  border-radius: 100px;
  margin-bottom: 16px;
  letter-spacing: 1px;
}

.section-title {
  font-size: 36px;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 16px;
  color: var(--text-main);
}

.section-desc {
  font-size: 16px;
  color: var(--text-muted);
}

/* 7. 首屏 (Hero Section) */
.hero {
  position: relative;
  padding: 180px 0 120px 0;
  overflow: hidden;
  background: radial-gradient(circle at 80% 20%, rgba(37, 99, 235, 0.04) 0%, transparent 50%),
              radial-gradient(circle at 10% 80%, rgba(14, 165, 233, 0.04) 0%, transparent 50%);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 60px;
  align-items: center;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  color: var(--primary);
  background-color: rgba(37, 99, 235, 0.06);
  padding: 8px 16px;
  border-radius: 100px;
  margin-bottom: 24px;
  border: 1px solid rgba(37, 99, 235, 0.1);
}

.hero-tag svg {
  animation: pulse 2s infinite;
}

.hero-title {
  font-size: 54px;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 24px;
  color: var(--text-main);
}

.hero-title span {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  font-size: 18px;
  color: var(--text-muted);
  margin-bottom: 40px;
  max-width: 600px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  margin-bottom: 48px;
}

.hero-stats {
  display: flex;
  gap: 48px;
  border-top: 1px solid var(--border);
  padding-top: 32px;
}

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

.stat-number {
  font-size: 28px;
  font-weight: 800;
  color: var(--text-main);
}

.stat-number span {
  color: var(--primary);
}

.stat-label {
  font-size: 13px;
  color: var(--text-muted);
}

/* 首屏线条插图 */
.hero-illustration {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-art-box {
  position: relative;
  width: 100%;
  aspect-ratio: 1;
  max-width: 420px;
  border: 2px dashed var(--border);
  border-radius: var(--border-radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  animation: rotateSlow 40s linear infinite;
}

.hero-art-inner {
  width: 80%;
  height: 80%;
  border: 2px solid rgba(37, 99, 235, 0.15);
  border-radius: 50%;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: rotateReverseSlow 30s linear infinite;
}

.hero-art-center {
  width: 60%;
  height: 60%;
  border: 1px solid var(--border);
  border-radius: var(--border-radius-md);
  background: rgba(var(--bg-secondary), 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--card-shadow);
  backdrop-filter: blur(8px);
}

.hero-art-center svg {
  color: var(--primary);
  width: 64px;
  height: 64px;
}

.hero-art-node {
  position: absolute;
  width: 48px;
  height: 48px;
  background-color: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--border-radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--card-shadow);
  transition: var(--transition-smooth);
}

.hero-art-node:hover {
  border-color: var(--primary);
  box-shadow: var(--card-shadow-hover);
  transform: scale(1.1);
}

.node-1 { top: -24px; left: calc(50% - 24px); }
.node-2 { bottom: -24px; left: calc(50% - 24px); }
.node-3 { left: -24px; top: calc(50% - 24px); }
.node-4 { right: -24px; top: calc(50% - 24px); }

/* 8. 业务板块 (Services) */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
}

.service-card {
  background-color: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--border-radius-md);
  padding: 40px;
  transition: var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background-color: var(--primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: var(--transition-smooth);
}

.service-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--card-shadow-hover);
  border-color: rgba(37, 99, 235, 0.15);
}

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

.service-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--border-radius-sm);
  background-color: rgba(37, 99, 235, 0.05);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  margin-bottom: 24px;
  transition: var(--transition-smooth);
}

.service-card:hover .service-icon {
  background-color: var(--primary);
  color: #ffffff;
}

.service-card h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-main);
}

.service-card p {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.service-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 600;
  color: var(--primary);
}

.service-link svg {
  transition: var(--transition-smooth);
}

.service-card:hover .service-link svg {
  transform: translateX(4px);
}

/* 9. 优势板块 (Advantages) */
.advantages-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 80px;
  align-items: center;
}

.advantages-visual {
  border: 1px solid var(--border);
  border-radius: var(--border-radius-lg);
  padding: 40px;
  background: radial-gradient(circle at 100% 0%, rgba(37, 99, 235, 0.03) 0%, transparent 60%);
  position: relative;
}

.adv-card-mockup {
  background-color: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--border-radius-md);
  padding: 24px;
  box-shadow: var(--card-shadow);
  margin-bottom: 24px;
  display: flex;
  align-items: flex-start;
  gap: 16px;
}

.adv-card-mockup:last-child {
  margin-bottom: 0;
  transform: translateX(20px);
}

.adv-card-mockup:first-child {
  transform: translateX(-20px);
}

.adv-mock-icon {
  background: rgba(37, 99, 235, 0.08);
  color: var(--primary);
  padding: 10px;
  border-radius: var(--border-radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
}

.adv-mock-content {
  flex: 1;
}

.adv-mock-title {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 4px;
}

.adv-mock-desc {
  font-size: 13px;
  color: var(--text-muted);
}

.advantages-list {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.adv-item {
  display: flex;
  gap: 20px;
}

.adv-icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  background-color: var(--bg-primary);
}

.adv-info h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-main);
}

.adv-info p {
  font-size: 14px;
  color: var(--text-muted);
}

/* 10. 流程板块 (Process) */
.process-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
  position: relative;
}

.process-grid::before {
  content: '';
  position: absolute;
  top: 25px;
  left: 12.5%;
  width: 75%;
  height: 1px;
  background-color: var(--border);
  z-index: 1;
}

.process-step {
  text-align: center;
  position: relative;
  z-index: 2;
}

.process-number {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background-color: var(--bg-primary);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  font-weight: 700;
  color: var(--text-muted);
  margin: 0 auto 24px auto;
  transition: var(--transition-smooth);
}

.process-step:hover .process-number {
  border-color: var(--primary);
  color: var(--primary);
  transform: scale(1.1);
  box-shadow: 0 0 15px rgba(37, 99, 235, 0.15);
}

.process-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-main);
}

.process-desc {
  font-size: 14px;
  color: var(--text-muted);
  padding: 0 10px;
}

/* 11. 联系我们 (Contact) */
.contact-grid {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 60px;
}

.contact-info-panel {
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.contact-method {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.contact-method-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--border-radius-sm);
  background-color: rgba(37, 99, 235, 0.05);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  flex-shrink: 0;
}

.contact-method-title {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 4px;
  color: var(--text-main);
}

.contact-method-value {
  font-size: 14px;
  color: var(--text-muted);
}

.contact-form {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--border-radius-md);
  padding: 40px;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-bottom: 24px;
}

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

.form-group-full {
  grid-column: span 2;
}

.form-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-main);
}

.form-input {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: var(--border-radius-sm);
  background-color: var(--bg-primary);
  color: var(--text-main);
  outline: none;
  font-size: 14px;
  font-family: inherit;
  transition: var(--transition-smooth);
}

.form-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

textarea.form-input {
  min-height: 120px;
  resize: vertical;
}

/* 12. 页脚 (Footer) */
.footer {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 80px 0 40px 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.5fr;
  gap: 40px;
  margin-bottom: 60px;
}

.footer-logo {
  margin-bottom: 20px;
}

.footer-desc {
  font-size: 14px;
  color: var(--text-muted);
  max-width: 280px;
}

.footer-col h4 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 24px;
  color: var(--text-main);
  position: relative;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-link {
  font-size: 14px;
  color: var(--text-muted);
}

.footer-link:hover {
  color: var(--primary);
  transform: translateX(4px);
}

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 40px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
}

.copyright {
  font-size: 13px;
  color: var(--text-light);
}

.footer-legal {
  display: flex;
  gap: 24px;
  list-style: none;
}

.footer-legal-link {
  font-size: 13px;
  color: var(--text-light);
}

.footer-legal-link:hover {
  color: var(--primary);
}

/* 13. 动画关键帧 */
@keyframes rotateSlow {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes rotateReverseSlow {
  from { transform: rotate(360deg); }
  to { transform: rotate(0deg); }
}

@keyframes pulse {
  0% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.1); opacity: 0.8; }
  100% { transform: scale(1); opacity: 1; }
}

/* 14. 响应式布局媒体查询 */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
    text-align: center;
  }
  
  .hero-desc {
    margin-left: auto;
    margin-right: auto;
  }
  
  .hero-actions {
    justify-content: center;
  }
  
  .hero-stats {
    justify-content: center;
  }
  
  .hero-illustration {
    order: -1;
  }
  
  .advantages-grid {
    grid-template-columns: 1fr;
    gap: 50px;
  }
  
  .process-grid::before {
    display: none;
  }
  
  .process-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 40px;
  }
  
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 50px;
  }
}

@media (max-width: 768px) {
  .section {
    padding: 60px 0;
  }
  
  .hero-title {
    font-size: 38px;
  }
  
  .mobile-menu-toggle {
    display: block;
    font-size: 24px;
  }
  
  .nav-menu {
    position: fixed;
    top: 80px;
    left: 0;
    width: 100%;
    height: calc(100vh - 80px);
    background-color: var(--bg-primary);
    flex-direction: column;
    padding: 40px 24px;
    gap: 30px;
    transform: translateX(100%);
    transition: var(--transition-smooth);
    border-top: 1px solid var(--border);
  }
  
  .nav-menu.open {
    transform: translateX(0);
  }
  
  .form-grid {
    grid-template-columns: 1fr;
  }
  
  .form-group-full {
    grid-column: span 1;
  }
  
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .process-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
  
  .hero-actions {
    flex-direction: column;
    width: 100%;
  }
  
  .hero-actions .btn {
    width: 100%;
  }
}