/* ============================================================
   易歪歪官网模板 - 全局样式
   符合谷歌SEO/GEO标准，贴近官网风格
   ============================================================ */

/* ---------- CSS Reset & Base ---------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Helvetica Neue", Arial, sans-serif;
  color: #333;
  background: #fff;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: #1a6dff;
}

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

ul, ol {
  list-style: none;
}

/* ---------- CSS Variables ---------- */
:root {
  --primary: #1a6dff;
  --primary-dark: #0052d9;
  --primary-light: #e8f0fe;
  --secondary: #ff6b35;
  --text-main: #1a1a2e;
  --text-body: #444;
  --text-muted: #888;
  --bg-white: #ffffff;
  --bg-light: #f5f7fa;
  --bg-dark: #0d1117;
  --border: #e5e8ef;
  --shadow-sm: 0 2px 8px rgba(26,109,255,0.08);
  --shadow-md: 0 8px 32px rgba(26,109,255,0.12);
  --shadow-lg: 0 16px 48px rgba(26,109,255,0.16);
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --transition: 0.25s ease;
  --container: 1200px;
}

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

/* ---------- Header / Navbar ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary);
}

.navbar-brand .logo-icon {
  width: 36px;
  height: 36px;
  background: var(--primary);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.1rem;
  font-weight: 900;
  letter-spacing: -1px;
}

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

.navbar-nav a {
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  color: var(--text-body);
  font-weight: 500;
  transition: background var(--transition), color var(--transition);
}

.navbar-nav a:hover,
.navbar-nav a.active {
  background: var(--primary-light);
  color: var(--primary);
}

.navbar-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 20px;
  background: var(--primary);
  color: #fff !important;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.9rem;
  transition: background var(--transition), box-shadow var(--transition);
}

.navbar-cta:hover {
  background: var(--primary-dark);
  box-shadow: 0 4px 16px rgba(26,109,255,0.3);
  color: #fff !important;
}

.navbar-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}

.navbar-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-body);
  border-radius: 2px;
  transition: var(--transition);
}

/* ---------- Breadcrumb ---------- */
.breadcrumb-wrap {
  background: var(--bg-light);
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.875rem;
  color: var(--text-muted);
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

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

.breadcrumb a:hover {
  text-decoration: underline;
}

.breadcrumb .sep {
  color: var(--text-muted);
}

/* ---------- Hero Section ---------- */
.hero {
  background: linear-gradient(135deg, #f0f5ff 0%, #e8f0fe 40%, #f5f7fa 100%);
  padding: 80px 0 60px;
  overflow: hidden;
  position: relative;
}

.hero::before {
  content: '';
  position: absolute;
  top: -80px;
  right: -80px;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(26,109,255,0.08) 0%, transparent 70%);
  border-radius: 50%;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--primary-light);
  color: var(--primary);
  padding: 4px 14px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 16px;
}

.hero h1 {
  font-size: 2.8rem;
  font-weight: 800;
  line-height: 1.2;
  color: var(--text-main);
  margin-bottom: 16px;
}

.hero h1 .brand {
  color: var(--primary);
}

.hero-desc {
  font-size: 1.05rem;
  color: var(--text-body);
  margin-bottom: 12px;
  line-height: 1.8;
}

.hero-stats {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-bottom: 32px;
}

.hero-stats .stat-num {
  font-size: 2rem;
  font-weight: 800;
  color: var(--secondary);
}

.hero-stats .stat-label {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.hero-download-group {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.btn-download {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 600;
  transition: all var(--transition);
  border: 2px solid transparent;
}

.btn-download.primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 4px 16px rgba(26,109,255,0.3);
}

.btn-download.primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(26,109,255,0.4);
  color: #fff;
}

.btn-download.outline {
  background: #fff;
  color: var(--text-body);
  border-color: var(--border);
}

.btn-download.outline:hover {
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-2px);
}

.hero-image {
  position: relative;
}

.hero-image img {
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  width: 100%;
}

/* ---------- Carousel ---------- */
.carousel-section {
  padding: 48px 0;
  background: #fff;
}

.carousel-wrap {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.carousel-track {
  display: flex;
  transition: transform 0.5s ease;
}

.carousel-slide {
  min-width: 100%;
  position: relative;
}

.carousel-slide img {
  width: 100%;
  height: 420px;
  object-fit: cover;
}

.carousel-caption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(transparent, rgba(0,0,0,0.6));
  color: #fff;
  padding: 32px 32px 24px;
}

.carousel-caption h3 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.carousel-caption p {
  font-size: 0.95rem;
  opacity: 0.9;
}

.carousel-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(255,255,255,0.9);
  border: none;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  z-index: 10;
  font-size: 1.1rem;
  color: var(--text-body);
}

.carousel-btn:hover {
  background: var(--primary);
  color: #fff;
}

.carousel-btn.prev { left: 16px; }
.carousel-btn.next { right: 16px; }

.carousel-dots {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 16px;
}

.carousel-dots span {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--border);
  cursor: pointer;
  transition: var(--transition);
}

.carousel-dots span.active {
  background: var(--primary);
  width: 24px;
  border-radius: 4px;
}

/* ---------- Section Common ---------- */
.section {
  padding: 72px 0;
}

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

.section-header {
  text-align: center;
  margin-bottom: 48px;
}

.section-tag {
  display: inline-block;
  background: var(--primary-light);
  color: var(--primary);
  padding: 4px 14px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.section-header h2 {
  font-size: 2rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 12px;
}

.section-header p {
  font-size: 1rem;
  color: var(--text-muted);
  max-width: 560px;
  margin: 0 auto;
}

/* ---------- Feature Cards ---------- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: #fff;
  border-radius: var(--radius-md);
  padding: 32px 24px;
  border: 1px solid var(--border);
  transition: all var(--transition);
  text-align: center;
}

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

.feature-icon {
  width: 64px;
  height: 64px;
  background: var(--primary-light);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  font-size: 1.8rem;
}

.feature-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 8px;
}

.feature-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ---------- Function Grid ---------- */
.func-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.func-item {
  background: #fff;
  border-radius: var(--radius-md);
  padding: 24px 16px;
  text-align: center;
  border: 1px solid var(--border);
  transition: all var(--transition);
  cursor: default;
}

.func-item:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-sm);
  transform: translateY(-2px);
}

.func-item .func-icon {
  width: 52px;
  height: 52px;
  margin: 0 auto 12px;
  background: var(--bg-light);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
}

.func-item span {
  font-size: 0.9rem;
  color: var(--text-body);
  font-weight: 500;
}

/* ---------- Platform Support ---------- */
.platform-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.platform-item {
  background: #fff;
  border-radius: var(--radius-md);
  padding: 28px 20px;
  text-align: center;
  border: 1px solid var(--border);
  transition: all var(--transition);
}

.platform-item:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-sm);
}

.platform-item .plat-icon {
  font-size: 2.4rem;
  margin-bottom: 10px;
}

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

.platform-item p {
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* ---------- Article List ---------- */
.article-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.article-card {
  background: #fff;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
}

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

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

.article-card .card-img-placeholder {
  width: 100%;
  height: 180px;
  background: linear-gradient(135deg, var(--primary-light), #dce8ff);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
}

.card-body {
  padding: 20px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

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

.card-tag {
  background: var(--primary-light);
  color: var(--primary);
  padding: 2px 10px;
  border-radius: 12px;
  font-size: 0.75rem;
  font-weight: 600;
}

.card-body h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 8px;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-body p {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.6;
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-footer {
  padding: 12px 20px;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.card-read-more {
  font-size: 0.85rem;
  color: var(--primary);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 4px;
}

.card-views {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ---------- Download Section ---------- */
.download-section {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  padding: 72px 0;
  color: #fff;
  text-align: center;
}

.download-section h2 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 12px;
}

.download-section p {
  font-size: 1rem;
  opacity: 0.85;
  margin-bottom: 36px;
}

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

.btn-dl {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  background: rgba(255,255,255,0.15);
  border: 2px solid rgba(255,255,255,0.4);
  border-radius: var(--radius-md);
  color: #fff;
  font-size: 0.95rem;
  font-weight: 600;
  transition: all var(--transition);
  backdrop-filter: blur(4px);
}

.btn-dl:hover {
  background: rgba(255,255,255,0.25);
  border-color: #fff;
  transform: translateY(-2px);
  color: #fff;
}

.btn-dl .dl-icon {
  font-size: 1.3rem;
}

.btn-dl .dl-info {
  text-align: left;
}

.btn-dl .dl-info small {
  display: block;
  font-size: 0.75rem;
  opacity: 0.8;
}

/* ---------- FAQ Section ---------- */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  overflow: hidden;
}

.faq-question {
  padding: 18px 24px;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-main);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: #fff;
  transition: background var(--transition);
}

.faq-question:hover {
  background: var(--bg-light);
}

.faq-question .faq-icon {
  font-size: 1.1rem;
  color: var(--primary);
  transition: transform var(--transition);
}

.faq-item.open .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  padding: 0 24px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.8;
  background: var(--bg-light);
}

.faq-item.open .faq-answer {
  max-height: 300px;
  padding: 16px 24px;
}

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

.testimonial-card {
  background: #fff;
  border-radius: var(--radius-md);
  padding: 28px;
  border: 1px solid var(--border);
  position: relative;
}

.testimonial-card::before {
  content: '"';
  position: absolute;
  top: 16px;
  left: 20px;
  font-size: 4rem;
  color: var(--primary-light);
  font-family: Georgia, serif;
  line-height: 1;
}

.testimonial-text {
  font-size: 0.9rem;
  color: var(--text-body);
  line-height: 1.7;
  margin-bottom: 16px;
  padding-top: 20px;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 12px;
}

.author-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
}

.author-info .name {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-main);
}

.author-info .role {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ---------- Stats Banner ---------- */
.stats-banner {
  background: var(--primary);
  padding: 48px 0;
  color: #fff;
}

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

.stat-item .num {
  font-size: 2.4rem;
  font-weight: 800;
  margin-bottom: 4px;
}

.stat-item .label {
  font-size: 0.9rem;
  opacity: 0.85;
}

/* ---------- Sidebar ---------- */
.page-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 32px;
  padding: 48px 0;
}

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

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

.widget-title {
  padding: 14px 20px;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
  border-bottom: 1px solid var(--border);
  background: var(--bg-light);
}

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

.widget-list li {
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.875rem;
}

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

.widget-list a {
  color: var(--text-body);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.widget-list a:hover {
  color: var(--primary);
}

.widget-list .views {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* ---------- Pagination ---------- */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  margin-top: 40px;
}

.pagination a,
.pagination span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  border: 1px solid var(--border);
  color: var(--text-body);
  transition: all var(--transition);
}

.pagination a:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.pagination .current {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

/* ---------- Article Content ---------- */
.article-content {
  background: #fff;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  padding: 40px;
}

.article-header {
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border);
}

.article-header h1 {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.4;
  margin-bottom: 16px;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.article-meta .meta-item {
  display: flex;
  align-items: center;
  gap: 4px;
}

.article-body {
  font-size: 0.95rem;
  line-height: 1.9;
  color: var(--text-body);
}

.article-body h2 {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-main);
  margin: 28px 0 12px;
  padding-left: 12px;
  border-left: 4px solid var(--primary);
}

.article-body h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-main);
  margin: 20px 0 10px;
}

.article-body p {
  margin-bottom: 16px;
}

.article-body ul, .article-body ol {
  margin: 12px 0 16px 20px;
  list-style: disc;
}

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

.article-body li {
  margin-bottom: 6px;
}

.article-body img {
  border-radius: var(--radius-md);
  margin: 20px 0;
  box-shadow: var(--shadow-sm);
}

.article-body blockquote {
  border-left: 4px solid var(--primary);
  background: var(--primary-light);
  padding: 16px 20px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 20px 0;
  font-style: italic;
  color: var(--text-body);
}

.article-body code {
  background: var(--bg-light);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: 'Courier New', monospace;
  font-size: 0.875em;
  color: var(--primary-dark);
}

.article-body pre {
  background: var(--bg-dark);
  color: #e8f0fe;
  padding: 20px;
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin: 20px 0;
}

.article-body pre code {
  background: none;
  color: inherit;
  padding: 0;
}

.article-tags {
  margin-top: 32px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.article-tags .tag {
  background: var(--bg-light);
  color: var(--text-muted);
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.8rem;
  border: 1px solid var(--border);
  transition: var(--transition);
}

.article-tags .tag:hover {
  background: var(--primary-light);
  color: var(--primary);
  border-color: var(--primary);
}

/* ---------- Download Cards ---------- */
.download-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.dl-card {
  background: #fff;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  padding: 32px;
  display: flex;
  align-items: flex-start;
  gap: 20px;
  transition: all var(--transition);
}

.dl-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
}

.dl-card .dl-platform-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: var(--primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  flex-shrink: 0;
}

.dl-card-info {
  flex: 1;
}

.dl-card-info h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 6px;
}

.dl-card-info p {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 12px;
  line-height: 1.6;
}

.dl-card-meta {
  display: flex;
  gap: 16px;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.btn-dl-card {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 20px;
  background: var(--primary);
  color: #fff;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 600;
  transition: all var(--transition);
}

.btn-dl-card:hover {
  background: var(--primary-dark);
  color: #fff;
  transform: translateY(-1px);
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--bg-dark);
  color: rgba(255,255,255,0.75);
  padding: 60px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-brand .brand-name {
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.footer-brand .brand-logo {
  width: 32px;
  height: 32px;
  background: var(--primary);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 900;
  font-size: 1rem;
}

.footer-brand p {
  font-size: 0.875rem;
  line-height: 1.7;
  margin-bottom: 20px;
}

.footer-social {
  display: flex;
  gap: 10px;
}

.footer-social a {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: rgba(255,255,255,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  transition: var(--transition);
}

.footer-social a:hover {
  background: var(--primary);
  color: #fff;
}

.footer-col h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 16px;
}

.footer-col ul li {
  margin-bottom: 10px;
}

.footer-col ul li a {
  font-size: 0.875rem;
  color: rgba(255,255,255,0.65);
  transition: color var(--transition);
}

.footer-col ul li a:hover {
  color: #fff;
}

.footer-bottom {
  padding: 20px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  color: rgba(255,255,255,0.45);
  flex-wrap: wrap;
  gap: 8px;
}

.footer-bottom a {
  color: rgba(255,255,255,0.6);
}

.footer-bottom a:hover {
  color: #fff;
}

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

@media (max-width: 768px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero h1 { font-size: 2rem; }
  .hero-image { display: none; }
  .article-list { grid-template-columns: 1fr; }
  .testimonials-grid { grid-template-columns: 1fr; }
  .download-grid { grid-template-columns: 1fr; }
  .platform-grid { grid-template-columns: repeat(2, 1fr); }
  .page-layout { grid-template-columns: 1fr; }
  .sidebar { display: none; }
  .navbar-nav { display: none; }
  .navbar-toggle { display: flex; }
  .navbar-nav.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: #fff;
    padding: 16px;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-md);
    z-index: 999;
  }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .article-content { padding: 24px; }
}

@media (max-width: 480px) {
  .hero-download-group { flex-direction: column; }
  .features-grid { grid-template-columns: 1fr; }
  .func-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .section { padding: 48px 0; }
  .section-header h2 { font-size: 1.6rem; }
}

/* ---------- Utility Classes ---------- */
.text-center { text-align: center; }
.text-primary { color: var(--primary); }
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mt-32 { margin-top: 32px; }
.mb-8 { margin-bottom: 8px; }
.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px; }
.mb-32 { margin-bottom: 32px; }
.hidden { display: none; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  border: 0;
}