/* ===================================
   NETVIBE 网脉 - 公共样式表
   配色方案取自国旗：红、白、黄、黑
   主色: #DE0F17 (国旗红 - 浓烈正红)
   深红: #9B0000 (暗红 - 稳重底色)
   亮红: #FF1A1A (鲜红 - 强调活力)
   金黄: #FFD700 (国旗黄 - 数据高亮)
   纯黑: #1A1A1A (文字 - 沉稳有力)
   背景: #FFFFFF (纯白)
   浅灰: #F5F5F5 (区块分隔)
   =================================== */

:root {
  --primary: #DE0F17;
  --primary-dark: #9B0000;
  --primary-light: #FF1A1A;
  --accent: #FFD700;
  --accent-bright: #FFE03B;
  --bg-light: #FAFAFA;
  --bg-tint: #FFF8E8;
  --gray: #E0E0E0;
  --gray-dark: #757575;
  --gray-light: #F5F5F5;
  --text: #1A1A1A;
  --text-light: #555555;
  --white: #FFFFFF;
  --black: #1A1A1A;
  --shadow: 0 2px 16px rgba(0, 0, 0, 0.08);
  --shadow-hover: 0 8px 40px rgba(0, 0, 0, 0.12);
  --radius: 4px;
  --radius-lg: 12px;
  --transition: all 0.3s ease;
  --max-width: 1200px;
}

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

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

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

a {
  color: var(--primary);
  text-decoration: none;
  transition: var(--transition);
  font-weight: 500;
}

a:hover {
  color: var(--primary-dark);
}

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

ul, ol {
  list-style: none;
}

/* Container */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.container-wide {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Section */
.section {
  padding: 80px 0;
}

.section-sm {
  padding: 48px 0;
}

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

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

.section-dark {
  background: var(--black);
  color: var(--white);
}

/* Typography - 大器简约，黑色标题为主 */
.section-title {
  font-size: 2.5rem;
  font-weight: 900;
  color: var(--black);
  text-align: center;
  margin-bottom: 12px;
  letter-spacing: 2px;
}

.section-subtitle {
  font-size: 1rem;
  color: var(--text-light);
  text-align: center;
  margin-bottom: 48px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.section-title.white {
  color: var(--white);
}

.section-subtitle.white {
  color: rgba(255, 255, 255, 0.8);
}

/* Divider - 红色粗线条，简洁有力 */
.title-divider {
  width: 60px;
  height: 4px;
  background: var(--primary);
  margin: 0 auto 48px;
  border-radius: 0;
}

/* Buttons - 简洁有力，红色主CTA */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 36px;
  font-size: 1rem;
  font-weight: 700;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  transition: var(--transition);
  letter-spacing: 2px;
  text-transform: uppercase;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--primary);
  color: var(--white);
}

.btn-primary:hover {
  background: var(--primary-dark);
  color: var(--white);
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(222, 15, 23, 0.35);
}

.btn-accent {
  background: var(--accent);
  color: var(--black);
  font-weight: 800;
}

.btn-accent:hover {
  background: var(--accent-bright);
  color: var(--black);
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(255, 215, 0, 0.4);
}

.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
  font-weight: 700;
}

.btn-outline:hover {
  background: var(--primary);
  color: var(--white);
}

.btn-white {
  background: var(--white);
  color: var(--primary);
  font-weight: 700;
}

.btn-white:hover {
  background: var(--bg-light);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
}

.btn-lg {
  padding: 18px 52px;
  font-size: 1.1rem;
}

/* Header - 白底稳重，黑色导航文字 */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
  z-index: 1000;
  transition: var(--transition);
}

.site-header.scrolled {
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
}

.header-inner {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 24px;
  height: 90px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo-area {
  display: flex;
  align-items: center;
}

.logo-area img {
  height: 70px;
  width: auto;
  display: block;
}

.logo-text {
  font-size: 1.3rem;
  font-weight: 900;
  color: var(--primary);
  letter-spacing: 2px;
}

.logo-text span {
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--text-light);
  letter-spacing: 1px;
  display: block;
}

/* Main Nav */
.main-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-item {
  position: relative;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 10px 16px;
  font-size: 0.9rem;
  color: var(--black);
  font-weight: 600;
  border-radius: var(--radius);
  transition: var(--transition);
  border-bottom: 3px solid transparent;
}

.nav-link:hover,
.nav-link.active {
  color: var(--primary);
  background: transparent;
  border-bottom: 3px solid var(--primary);
  border-radius: 0;
}

.nav-link .arrow {
  font-size: 0.7rem;
  transition: var(--transition);
}

.nav-item:hover .arrow {
  transform: rotate(180deg);
}

/* Dropdown */
.nav-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 200px;
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow-hover);
  padding: 8px 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: var(--transition);
  z-index: 100;
}

.nav-item:hover .nav-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.nav-dropdown a {
  display: block;
  padding: 10px 20px;
  font-size: 0.875rem;
  color: var(--text);
  transition: var(--transition);
}

.nav-dropdown a:hover {
  background: var(--bg-tint);
  color: var(--primary);
  padding-left: 26px;
}

/* Header CTA */
.header-cta {
  display: flex;
  align-items: center;
  gap: 12px;
}

.btn-header {
  padding: 10px 24px;
  font-size: 0.875rem;
}

/* Mobile menu toggle */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
}

.menu-toggle span {
  width: 24px;
  height: 2px;
  background: var(--black);
  transition: var(--transition);
  border-radius: 2px;
}

.menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

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

.menu-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Nav */
.mobile-nav {
  display: none;
  position: fixed;
  top: 90px;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--white);
  z-index: 999;
  overflow-y: auto;
  padding: 20px;
}

.mobile-nav.active {
  display: block;
}

.mobile-nav-item {
  border-bottom: 1px solid var(--gray-light);
}

.mobile-nav-item > a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
}

.mobile-nav-item > a:hover {
  color: var(--primary);
}

.mobile-nav-sub {
  display: none;
  padding: 0 0 10px 20px;
}

.mobile-nav-item.open .mobile-nav-sub {
  display: block;
}

.mobile-nav-sub a {
  display: block;
  padding: 8px 0;
  font-size: 0.9rem;
  color: var(--text-light);
}

.mobile-nav-sub a:hover {
  color: var(--primary);
}

/* Page Banner - 红底白字，简洁有力 */
.page-banner {
  margin-top: 90px;
  padding: 60px 0;
  background: var(--primary);
  color: var(--white);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.page-banner::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="50" cy="50" r="40" fill="none" stroke="rgba(255,255,255,0.05)" stroke-width="1"/></svg>');
  background-size: 200px;
  opacity: 0.5;
}

.page-banner h1 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 12px;
  position: relative;
}

.page-banner p {
  font-size: 1.1rem;
  opacity: 0.9;
  position: relative;
}

.breadcrumb {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-top: 16px;
  font-size: 0.875rem;
  position: relative;
}

.breadcrumb a {
  color: rgba(255, 255, 255, 0.8);
}

.breadcrumb a:hover {
  color: var(--white);
}

.breadcrumb span {
  opacity: 0.6;
}

/* Cards */
.card {
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: var(--transition);
}

.card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-4px);
}

.card-body {
  padding: 28px;
}

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

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

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

/* Feature Icon - 红色方块图标 */
.feature-icon {
  width: 64px;
  height: 64px;
  border-radius: var(--radius);
  background: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  margin-bottom: 20px;
  transition: var(--transition);
  color: var(--white);
}

.card:hover .feature-icon {
  background: var(--black);
  color: var(--white);
}

.feature-icon svg {
  width: 32px;
  height: 32px;
  stroke: var(--white);
  transition: var(--transition);
}

.card:hover .feature-icon svg {
  stroke: var(--white);
}

/* Stats - 超大数字，黄色高亮 */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.stat-item {
  text-align: center;
  padding: 32px 16px;
}

.stat-number {
  font-size: 3.5rem;
  font-weight: 900;
  color: var(--accent);
  line-height: 1.1;
  margin-bottom: 8px;
  text-shadow: 0 2px 10px rgba(255, 215, 0, 0.2);
}

.stat-label {
  font-size: 0.95rem;
  color: var(--text-light);
  font-weight: 500;
}

/* Footer - 纯黑底色 */
.site-footer {
  background: var(--black);
  color: rgba(255, 255, 255, 0.8);
  padding: 60px 0 20px;
}

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

.footer-brand img {
  height: 100px;
  width: auto;
  display: block;
  margin-bottom: 16px;
}

.footer-brand p {
  font-size: 0.875rem;
  line-height: 1.8;
  margin-bottom: 16px;
}

.footer-brand .slogan {
  font-size: 1.1rem;
  color: var(--accent);
  font-weight: 700;
  letter-spacing: 2px;
}

.footer-qr-codes {
  display: flex;
  gap: 24px;
  justify-content: center;
}

.footer-qr-codes .qr-item {
  text-align: center;
}

.footer-qr-codes .qr-placeholder {
  width: 110px;
  height: 110px;
  background: rgba(255, 255, 255, 0.12);
  border: 2px dashed rgba(255, 255, 255, 0.3);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.6);
  margin-bottom: 10px;
}

.footer-qr-codes p {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.8);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 20px;
  text-align: center;
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.5);
}

/* Animations */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

.fade-in-up {
  animation: fadeInUp 0.8s ease forwards;
}

.fade-in {
  animation: fadeIn 0.8s ease forwards;
}

/* Scroll animation */
.scroll-reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.scroll-reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

/* Responsive */
@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
  }
  
  .footer-brand {
    grid-column: 1 / -1;
  }

  .footer-brand img {
    height: 90px;
  }
  
  .footer-qr-codes {
    justify-content: flex-start;
  }
  
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .main-nav,
  .header-cta {
    display: none;
  }
  
  .menu-toggle {
    display: flex;
  }
  
  .section {
    padding: 48px 0;
  }
  
  .section-title {
    font-size: 1.6rem;
  }
  
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
  
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .stat-number {
    font-size: 2rem;
  }
  
  .page-banner h1 {
    font-size: 1.8rem;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
    text-align: center;
  }

  .footer-brand img {
    height: 80px;
    margin: 0 auto;
  }

  .footer-qr-codes {
    justify-content: center;
  }
  
  .footer-brand {
    grid-column: 1 / -1;
  }
  
  .footer-contact p {
    justify-content: center;
  }
  
  .btn {
    padding: 12px 28px;
  }
}

@media (max-width: 480px) {
  .stats-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
  }
  
  .container {
    padding: 0 16px;
  }
}