/* ============================================================
   LINE中文官网 - 全局样式
   ============================================================ */

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

:root {
  --line-green: #00B900;
  --line-green-dark: #009900;
  --line-green-light: #e8f9e8;
  --line-black: #1a1a1a;
  --line-gray: #666666;
  --line-light-gray: #f5f5f5;
  --line-border: #e0e0e0;
  --line-white: #ffffff;
  --font-main: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', 'WenQuanYi Micro Hei', sans-serif;
  --transition: all 0.3s ease;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 20px rgba(0,0,0,0.12);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.16);
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
}

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

body {
  font-family: var(--font-main);
  color: var(--line-black);
  background: var(--line-white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--line-green);
  text-decoration: none;
  transition: var(--transition);
}

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

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

ul, ol {
  list-style: none;
}

/* ============================================================
   排版
   ============================================================ */

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.3;
  color: var(--line-black);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.1rem; }
h6 { font-size: 1rem; }

p {
  margin-bottom: 1rem;
  color: var(--line-gray);
}

/* ============================================================
   容器
   ============================================================ */

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.container-wide {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 40px;
}

/* ============================================================
   按钮
   ============================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 50px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  text-decoration: none;
  white-space: nowrap;
}

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

.btn-primary:hover {
  background: var(--line-green-dark);
  color: var(--line-white);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0,185,0,0.35);
}

.btn-outline {
  background: transparent;
  color: var(--line-green);
  border: 2px solid var(--line-green);
}

.btn-outline:hover {
  background: var(--line-green);
  color: var(--line-white);
  transform: translateY(-2px);
}

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

.btn-white:hover {
  background: var(--line-green-light);
  color: var(--line-green-dark);
}

.btn-lg {
  padding: 16px 40px;
  font-size: 1.1rem;
}

.btn-sm {
  padding: 8px 20px;
  font-size: 0.9rem;
}

/* ============================================================
   导航栏
   ============================================================ */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--line-white);
  border-bottom: 1px solid var(--line-border);
  transition: var(--transition);
}

.site-header.scrolled {
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  padding: 0 40px;
  max-width: 1440px;
  margin: 0 auto;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--line-black);
  text-decoration: none;
}

.logo img {
  width: 36px;
  height: 36px;
  border-radius: 8px;
}

.logo span {
  color: var(--line-green);
}

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

.main-nav a {
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--line-black);
  transition: var(--transition);
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--line-green);
  background: var(--line-green-light);
}

.nav-dropdown {
  position: relative;
}

.nav-dropdown > a::after {
  content: ' ▾';
  font-size: 0.75rem;
}

.dropdown-menu {
  display: none;
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  min-width: 200px;
  background: var(--line-white);
  border: 1px solid var(--line-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  padding: 8px 0;
  z-index: 100;
}

.nav-dropdown:hover .dropdown-menu {
  display: block;
}

.dropdown-menu a {
  display: block;
  padding: 10px 20px;
  font-size: 0.9rem;
  color: var(--line-black);
  border-radius: 0;
}

.dropdown-menu a:hover {
  background: var(--line-green-light);
  color: var(--line-green);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  flex-direction: column;
  gap: 5px;
}

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

/* ============================================================
   轮播图 Hero Banner
   ============================================================ */

.hero-slider {
  margin-top: 64px;
  position: relative;
  overflow: hidden;
  background: #1a1a1a;
}

.slider-track {
  display: flex;
  transition: transform 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.slide {
  min-width: 100%;
  position: relative;
  height: 600px;
  overflow: hidden;
}

.slide-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

.slide-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(0,0,0,0.55) 0%, rgba(0,0,0,0.15) 100%);
}

.slide-content {
  position: relative;
  z-index: 2;
  height: 100%;
  display: flex;
  align-items: center;
  padding: 0 80px;
  max-width: 1440px;
  margin: 0 auto;
}

.slide-text {
  max-width: 580px;
  color: var(--line-white);
}

.slide-text .badge {
  display: inline-block;
  background: var(--line-green);
  color: white;
  padding: 4px 14px;
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  margin-bottom: 16px;
  text-transform: uppercase;
}

.slide-text h1 {
  font-size: 3rem;
  font-weight: 800;
  color: var(--line-white);
  line-height: 1.2;
  margin-bottom: 16px;
}

.slide-text p {
  font-size: 1.15rem;
  color: rgba(255,255,255,0.85);
  margin-bottom: 28px;
  line-height: 1.7;
}

.slide-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

/* 轮播控制 */
.slider-controls {
  position: absolute;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 8px;
  z-index: 10;
}

.slider-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(255,255,255,0.5);
  cursor: pointer;
  transition: var(--transition);
  border: none;
}

.slider-dot.active {
  background: var(--line-white);
  width: 24px;
  border-radius: 4px;
}

.slider-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 10;
  background: rgba(255,255,255,0.2);
  border: 1px solid rgba(255,255,255,0.4);
  color: white;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  transition: var(--transition);
  backdrop-filter: blur(4px);
}

.slider-arrow:hover {
  background: rgba(255,255,255,0.35);
}

.slider-arrow.prev { left: 24px; }
.slider-arrow.next { right: 24px; }

/* ============================================================
   区块通用样式
   ============================================================ */

.section {
  padding: 80px 0;
}

.section-sm {
  padding: 50px 0;
}

.section-lg {
  padding: 100px 0;
}

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

.section-green {
  background: var(--line-green);
  color: var(--line-white);
}

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

.section-header {
  text-align: center;
  margin-bottom: 56px;
}

.section-header .tag {
  display: inline-block;
  color: var(--line-green);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.section-header h2 {
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 16px;
}

.section-header p {
  font-size: 1.05rem;
  max-width: 600px;
  margin: 0 auto;
}

/* ============================================================
   功能卡片
   ============================================================ */

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  background: var(--line-white);
  border-radius: var(--radius-md);
  padding: 36px 28px;
  border: 1px solid var(--line-border);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--line-green);
  transform: scaleX(0);
  transition: var(--transition);
}

.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
  border-color: transparent;
}

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

.feature-icon {
  width: 56px;
  height: 56px;
  background: var(--line-green-light);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  font-size: 1.6rem;
}

.feature-card h3 {
  font-size: 1.2rem;
  margin-bottom: 12px;
}

.feature-card p {
  font-size: 0.95rem;
  line-height: 1.7;
  margin: 0;
}

/* ============================================================
   新闻/文章列表
   ============================================================ */

.news-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.news-card {
  background: var(--line-white);
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--line-border);
  transition: var(--transition);
}

.news-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: transparent;
}

.news-card-img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  background: var(--line-light-gray);
}

.news-card-body {
  padding: 20px;
}

.news-card-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 10px;
  font-size: 0.8rem;
  color: var(--line-gray);
}

.news-card-meta .cat {
  background: var(--line-green-light);
  color: var(--line-green);
  padding: 2px 10px;
  border-radius: 50px;
  font-weight: 600;
}

.news-card h3 {
  font-size: 1rem;
  margin-bottom: 10px;
  line-height: 1.5;
}

.news-card h3 a {
  color: var(--line-black);
}

.news-card h3 a:hover {
  color: var(--line-green);
}

.news-card p {
  font-size: 0.88rem;
  line-height: 1.6;
  margin: 0;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ============================================================
   下载区块
   ============================================================ */

.download-section {
  background: linear-gradient(135deg, #00B900 0%, #009900 100%);
  color: var(--line-white);
  padding: 80px 0;
  text-align: center;
}

.download-section h2 {
  color: var(--line-white);
  font-size: 2.4rem;
  margin-bottom: 16px;
}

.download-section p {
  color: rgba(255,255,255,0.85);
  font-size: 1.1rem;
  margin-bottom: 36px;
}

.download-btns {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.download-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  background: rgba(255,255,255,0.15);
  border: 2px solid rgba(255,255,255,0.6);
  border-radius: 12px;
  color: var(--line-white);
  font-size: 0.95rem;
  font-weight: 600;
  transition: var(--transition);
  backdrop-filter: blur(4px);
}

.download-btn:hover {
  background: rgba(255,255,255,0.3);
  color: var(--line-white);
  transform: translateY(-2px);
}

.download-btn .icon {
  font-size: 1.4rem;
}

.download-btn .text-sm {
  font-size: 0.7rem;
  font-weight: 400;
  opacity: 0.8;
  display: block;
}

.download-btn .text-lg {
  font-size: 1rem;
  font-weight: 700;
  display: block;
}

.qr-section {
  display: flex;
  justify-content: center;
  gap: 40px;
  margin-top: 20px;
}

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

.qr-item img {
  width: 120px;
  height: 120px;
  border-radius: 12px;
  background: white;
  padding: 8px;
  margin: 0 auto 8px;
}

.qr-item p {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.8);
  margin: 0;
}

/* ============================================================
   统计数字
   ============================================================ */

.stats-section {
  background: var(--line-black);
  padding: 60px 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 40px;
  text-align: center;
}

.stat-item h3 {
  font-size: 3rem;
  font-weight: 800;
  color: var(--line-green);
  margin-bottom: 8px;
}

.stat-item p {
  font-size: 0.95rem;
  color: rgba(255,255,255,0.7);
  margin: 0;
}

/* ============================================================
   面包屑
   ============================================================ */

.breadcrumb {
  padding: 14px 0;
  border-bottom: 1px solid var(--line-border);
  margin-top: 64px;
  background: var(--line-light-gray);
}

.breadcrumb-list {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.88rem;
  flex-wrap: wrap;
}

.breadcrumb-list li {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--line-gray);
}

.breadcrumb-list li a {
  color: var(--line-gray);
}

.breadcrumb-list li a:hover {
  color: var(--line-green);
}

.breadcrumb-list li.active {
  color: var(--line-black);
  font-weight: 500;
}

.breadcrumb-list li::after {
  content: '›';
  color: #ccc;
}

.breadcrumb-list li:last-child::after {
  display: none;
}

/* ============================================================
   侧边栏
   ============================================================ */

.content-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 40px;
  padding: 40px 0;
}

.sidebar {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.sidebar-widget {
  background: var(--line-white);
  border: 1px solid var(--line-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.widget-title {
  background: var(--line-green);
  color: var(--line-white);
  padding: 14px 20px;
  font-size: 1rem;
  font-weight: 700;
}

.widget-body {
  padding: 16px 20px;
}

.widget-list li {
  border-bottom: 1px solid var(--line-border);
  padding: 10px 0;
}

.widget-list li:last-child {
  border-bottom: none;
}

.widget-list li a {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  color: var(--line-black);
  font-size: 0.9rem;
  line-height: 1.5;
}

.widget-list li a:hover {
  color: var(--line-green);
}

.widget-list li a .num {
  min-width: 22px;
  height: 22px;
  background: var(--line-green);
  color: white;
  border-radius: 50%;
  font-size: 0.75rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 1px;
}

/* ============================================================
   分页
   ============================================================ */

.pagination {
  display: flex;
  justify-content: center;
  gap: 8px;
  padding: 40px 0;
}

.page-item {
  display: inline-flex;
}

.page-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line-border);
  color: var(--line-black);
  font-size: 0.9rem;
  transition: var(--transition);
}

.page-link:hover,
.page-link.active {
  background: var(--line-green);
  color: var(--line-white);
  border-color: var(--line-green);
}

/* ============================================================
   文章内容页
   ============================================================ */

.article-header {
  padding: 40px 0 30px;
  border-bottom: 1px solid var(--line-border);
  margin-bottom: 30px;
}

.article-header h1 {
  font-size: 2rem;
  margin-bottom: 16px;
  line-height: 1.4;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 0.88rem;
  color: var(--line-gray);
  flex-wrap: wrap;
}

.article-meta span {
  display: flex;
  align-items: center;
  gap: 5px;
}

.article-content {
  font-size: 1rem;
  line-height: 1.9;
  color: #333;
}

.article-content h2 {
  font-size: 1.6rem;
  margin: 36px 0 16px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--line-green);
  color: var(--line-black);
}

.article-content h3 {
  font-size: 1.3rem;
  margin: 28px 0 12px;
  color: var(--line-black);
}

.article-content p {
  margin-bottom: 1.2rem;
  color: #444;
}

.article-content img {
  border-radius: var(--radius-md);
  margin: 24px auto;
  max-width: 100%;
}

.article-content ul, .article-content ol {
  margin: 16px 0 16px 24px;
}

.article-content ul {
  list-style: disc;
}

.article-content ol {
  list-style: decimal;
}

.article-content li {
  margin-bottom: 8px;
  color: #444;
}

.article-content blockquote {
  border-left: 4px solid var(--line-green);
  padding: 16px 20px;
  background: var(--line-green-light);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 24px 0;
  font-style: italic;
  color: #555;
}

.article-tags {
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--line-border);
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.tag-item {
  padding: 5px 14px;
  background: var(--line-light-gray);
  border: 1px solid var(--line-border);
  border-radius: 50px;
  font-size: 0.85rem;
  color: var(--line-gray);
  transition: var(--transition);
}

.tag-item:hover {
  background: var(--line-green-light);
  color: var(--line-green);
  border-color: var(--line-green);
}

/* ============================================================
   下载页
   ============================================================ */

.download-hero {
  background: linear-gradient(135deg, #00B900 0%, #006600 100%);
  padding: 80px 0;
  text-align: center;
  color: white;
  margin-top: 64px;
}

.download-hero h1 {
  color: white;
  font-size: 2.8rem;
  margin-bottom: 16px;
}

.download-hero p {
  color: rgba(255,255,255,0.85);
  font-size: 1.15rem;
  margin-bottom: 0;
}

.download-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  padding: 60px 0;
}

.download-card {
  background: var(--line-white);
  border: 1px solid var(--line-border);
  border-radius: var(--radius-lg);
  padding: 40px 30px;
  text-align: center;
  transition: var(--transition);
}

.download-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
  border-color: var(--line-green);
}

.download-card .platform-icon {
  font-size: 3rem;
  margin-bottom: 20px;
  display: block;
}

.download-card h3 {
  font-size: 1.3rem;
  margin-bottom: 10px;
}

.download-card p {
  font-size: 0.9rem;
  margin-bottom: 24px;
}

.download-card .version {
  font-size: 0.8rem;
  color: var(--line-gray);
  margin-bottom: 20px;
}

/* ============================================================
   列表页
   ============================================================ */

.list-header {
  background: linear-gradient(135deg, #00B900 0%, #009900 100%);
  padding: 50px 0;
  color: white;
  margin-top: 64px;
}

.list-header h1 {
  color: white;
  font-size: 2.2rem;
  margin-bottom: 10px;
}

.list-header p {
  color: rgba(255,255,255,0.85);
  margin: 0;
}

.article-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.article-item {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 24px;
  background: var(--line-white);
  border: 1px solid var(--line-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
}

.article-item:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: transparent;
}

.article-item-img {
  width: 100%;
  height: 180px;
  object-fit: cover;
  background: var(--line-light-gray);
}

.article-item-body {
  padding: 20px 24px 20px 0;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.article-item-body h3 {
  font-size: 1.1rem;
  margin-bottom: 10px;
}

.article-item-body h3 a {
  color: var(--line-black);
}

.article-item-body h3 a:hover {
  color: var(--line-green);
}

.article-item-body p {
  font-size: 0.9rem;
  line-height: 1.6;
  margin-bottom: 16px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-item-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--line-gray);
}

/* ============================================================
   页脚
   ============================================================ */

.site-footer {
  background: #1a1a1a;
  color: rgba(255,255,255,0.7);
  padding: 60px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 50px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-brand .logo {
  color: white;
  margin-bottom: 16px;
}

.footer-brand p {
  font-size: 0.9rem;
  line-height: 1.7;
  color: rgba(255,255,255,0.6);
  margin-bottom: 24px;
}

.footer-social {
  display: flex;
  gap: 12px;
}

.social-link {
  width: 38px;
  height: 38px;
  background: rgba(255,255,255,0.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,0.7);
  font-size: 0.9rem;
  transition: var(--transition);
  text-decoration: none;
}

.social-link:hover {
  background: var(--line-green);
  color: white;
}

.footer-col h4 {
  color: white;
  font-size: 1rem;
  margin-bottom: 20px;
  font-weight: 700;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  color: rgba(255,255,255,0.6);
  font-size: 0.9rem;
  transition: var(--transition);
}

.footer-links a:hover {
  color: var(--line-green);
}

.footer-bottom {
  padding: 20px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  color: rgba(255,255,255,0.4);
  flex-wrap: wrap;
  gap: 12px;
}

.footer-bottom-links {
  display: flex;
  gap: 20px;
}

.footer-bottom-links a {
  color: rgba(255,255,255,0.4);
  font-size: 0.85rem;
}

.footer-bottom-links a:hover {
  color: var(--line-green);
}

/* ============================================================
   公告栏
   ============================================================ */

.notice-bar {
  background: var(--line-green);
  color: white;
  padding: 10px 0;
  text-align: center;
  font-size: 0.9rem;
}

.notice-bar a {
  color: white;
  font-weight: 600;
  text-decoration: underline;
}

/* ============================================================
   搜索框
   ============================================================ */

.search-box {
  display: flex;
  align-items: center;
  background: var(--line-light-gray);
  border: 1px solid var(--line-border);
  border-radius: 50px;
  padding: 8px 16px;
  gap: 8px;
  transition: var(--transition);
}

.search-box:focus-within {
  border-color: var(--line-green);
  box-shadow: 0 0 0 3px rgba(0,185,0,0.15);
}

.search-box input {
  background: none;
  border: none;
  outline: none;
  font-size: 0.9rem;
  color: var(--line-black);
  width: 180px;
}

.search-box button {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--line-gray);
  font-size: 1rem;
  padding: 0;
  transition: var(--transition);
}

.search-box button:hover {
  color: var(--line-green);
}

/* ============================================================
   标签云
   ============================================================ */

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag-cloud a {
  padding: 5px 14px;
  background: var(--line-light-gray);
  border: 1px solid var(--line-border);
  border-radius: 50px;
  font-size: 0.85rem;
  color: var(--line-gray);
  transition: var(--transition);
}

.tag-cloud a:hover {
  background: var(--line-green-light);
  color: var(--line-green);
  border-color: var(--line-green);
}

/* ============================================================
   APP 展示区
   ============================================================ */

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

.app-showcase-text h2 {
  font-size: 2.2rem;
  margin-bottom: 16px;
}

.app-showcase-text p {
  font-size: 1.05rem;
  margin-bottom: 24px;
}

.app-showcase-img {
  position: relative;
}

.app-showcase-img img {
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

/* ============================================================
   响应式
   ============================================================ */

@media (max-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 30px;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
  }

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

  .content-layout {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 768px) {
  h1 { font-size: 1.8rem; }
  h2 { font-size: 1.5rem; }
  h3 { font-size: 1.2rem; }

  .header-inner {
    padding: 0 20px;
  }

  .main-nav {
    display: none;
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: white;
    flex-direction: column;
    padding: 20px;
    border-bottom: 1px solid var(--line-border);
    box-shadow: var(--shadow-md);
    gap: 4px;
  }

  .main-nav.open {
    display: flex;
  }

  .main-nav a {
    width: 100%;
    padding: 12px 16px;
  }

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

  .slide {
    height: 450px;
  }

  .slide-content {
    padding: 0 24px;
  }

  .slide-text h1 {
    font-size: 1.8rem;
  }

  .section {
    padding: 50px 0;
  }

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

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

  .article-item {
    grid-template-columns: 1fr;
  }

  .article-item-img {
    height: 200px;
  }

  .article-item-body {
    padding: 16px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

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

  .download-cards {
    grid-template-columns: 1fr;
  }

  .app-showcase {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .download-btns {
    flex-direction: column;
    align-items: center;
  }

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

  .container-wide {
    padding: 0 20px;
  }

  .qr-section {
    flex-direction: column;
    align-items: center;
    gap: 20px;
  }

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

@media (max-width: 480px) {
  .slide {
    height: 380px;
  }

  .slide-text h1 {
    font-size: 1.5rem;
  }

  .slide-actions {
    flex-direction: column;
  }
}

/* ============================================================
   辅助工具类
   ============================================================ */

.text-center { text-align: center; }
.text-green { color: var(--line-green); }
.text-white { color: var(--line-white); }
.text-gray { color: var(--line-gray); }
.font-bold { font-weight: 700; }
.mt-4 { margin-top: 1rem; }
.mb-4 { margin-bottom: 1rem; }
.mt-8 { margin-top: 2rem; }
.mb-8 { margin-bottom: 2rem; }
.hidden { display: none; }
.d-flex { display: flex; }
.align-center { align-items: center; }
.justify-center { justify-content: center; }
.gap-2 { gap: 0.5rem; }
.gap-4 { gap: 1rem; }

/* ============================================================
   动画
   ============================================================ */

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

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

.animate-fadeInUp {
  animation: fadeInUp 0.6s ease forwards;
}

.animate-fadeIn {
  animation: fadeIn 0.5s ease forwards;
}

/* ============================================================
   返回顶部
   ============================================================ */

.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 44px;
  height: 44px;
  background: var(--line-green);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  z-index: 999;
  border: none;
  box-shadow: 0 4px 12px rgba(0,185,0,0.4);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background: var(--line-green-dark);
  transform: translateY(-3px);
}