/* =============================================
   爱思助手下载 - 官网主样式
   品牌色：#1677FF（主蓝）| #0052CC（深蓝）
   ============================================= */

:root {
  --primary: #1677FF;
  --primary-dark: #0052CC;
  --primary-light: #E8F4FF;
  --accent: #00C853;
  --accent-dark: #009624;
  --text-primary: #1a1a2e;
  --text-secondary: #4a5568;
  --text-muted: #718096;
  --bg-white: #ffffff;
  --bg-light: #F5F7FA;
  --bg-section: #EEF4FF;
  --border: #E2E8F0;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 16px rgba(22,119,255,0.12);
  --shadow-lg: 0 8px 32px rgba(22,119,255,0.18);
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --font-cn: 'PingFang SC', 'Microsoft YaHei', '微软雅黑', 'Hiragino Sans GB', sans-serif;
}

/* Reset */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-cn);
  color: var(--text-primary);
  background: var(--bg-white);
  line-height: 1.7;
  font-size: 15px;
}
a { color: var(--primary); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--primary-dark); }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }

/* ===================== HEADER ===================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: #fff;
  border-bottom: 1px solid var(--border);
  box-shadow: 0 2px 12px rgba(22,119,255,0.08);
}
.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.logo-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex-shrink: 0;
}
.logo-wrap img {
  width: 40px;
  height: 40px;
  border-radius: 10px;
}
.logo-text {
  font-size: 18px;
  font-weight: 700;
  color: var(--primary);
  line-height: 1.2;
}
.logo-sub {
  font-size: 11px;
  color: var(--text-muted);
  font-weight: 400;
}

/* Main Nav */
.main-nav { display: flex; align-items: center; gap: 4px; }
.main-nav a {
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all 0.2s;
}
.main-nav a:hover, .main-nav a.active {
  color: var(--primary);
  background: var(--primary-light);
}

.header-download {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff !important;
  padding: 8px 20px !important;
  border-radius: 24px !important;
  font-weight: 600 !important;
  font-size: 14px !important;
  box-shadow: 0 3px 10px rgba(22,119,255,0.35);
  transition: all 0.2s !important;
}
.header-download:hover {
  transform: translateY(-1px);
  box-shadow: 0 5px 16px rgba(22,119,255,0.45) !important;
  background: linear-gradient(135deg, #2688FF, var(--primary)) !important;
}

/* Hamburger (mobile) */
.hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 4px; }
.hamburger span { display: block; width: 22px; height: 2px; background: var(--text-secondary); border-radius: 2px; transition: 0.3s; }

/* ===================== BREADCRUMB ===================== */
.breadcrumb {
  background: var(--bg-light);
  border-bottom: 1px solid var(--border);
  padding: 10px 0;
}
.breadcrumb-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--text-muted);
}
.breadcrumb-inner a { color: var(--text-muted); }
.breadcrumb-inner a:hover { color: var(--primary); }
.breadcrumb-inner .sep { color: #CBD5E0; }
.breadcrumb-inner .current { color: var(--text-secondary); }

/* ===================== HERO / SLIDER ===================== */
.hero-slider {
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, #0052CC 0%, #1677FF 50%, #00AAFF 100%);
}
.slider-track {
  display: flex;
  transition: transform 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}
.slide {
  min-width: 100%;
  position: relative;
}
.slide img {
  width: 100%;
  height: 480px;
  object-fit: cover;
  object-position: center;
}
.slider-dots {
  position: absolute;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 8px;
}
.slider-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(255,255,255,0.5);
  cursor: pointer;
  transition: all 0.3s;
  border: none;
}
.slider-dot.active {
  background: #fff;
  width: 24px;
  border-radius: 4px;
}
.slider-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(255,255,255,0.2);
  border: 1px solid rgba(255,255,255,0.4);
  color: #fff;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  cursor: pointer;
  font-size: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
  backdrop-filter: blur(4px);
}
.slider-btn:hover { background: rgba(255,255,255,0.35); }
.slider-btn.prev { left: 20px; }
.slider-btn.next { right: 20px; }

/* ===================== SECTIONS ===================== */
.section { padding: 64px 0; }
.section-alt { background: var(--bg-light); }
.section-blue { background: linear-gradient(135deg, #EEF4FF, #E8F4FF); }
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.section-header { text-align: center; margin-bottom: 48px; }
.section-title {
  font-size: 32px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
  line-height: 1.3;
}
.section-title span { color: var(--primary); }
.section-subtitle {
  font-size: 16px;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* ===================== DOWNLOAD CARDS ===================== */
.download-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}
.download-card {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border);
  transition: all 0.3s;
  text-align: center;
}
.download-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary);
}
.download-card-icon {
  width: 72px;
  height: 72px;
  margin: 0 auto 16px;
  border-radius: 18px;
  overflow: hidden;
}
.download-card-icon img { width: 100%; height: 100%; object-fit: cover; }
.download-card h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}
.download-card p {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 20px;
  line-height: 1.6;
}
.version-info {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 16px;
  padding: 8px 12px;
  background: var(--bg-light);
  border-radius: var(--radius-sm);
}
.btn-download {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: #fff;
  padding: 12px 28px;
  border-radius: 30px;
  font-weight: 600;
  font-size: 15px;
  box-shadow: 0 4px 14px rgba(0,200,83,0.35);
  transition: all 0.2s;
  cursor: pointer;
  border: none;
  text-decoration: none;
}
.btn-download:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0,200,83,0.45);
  color: #fff;
}
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  padding: 12px 28px;
  border-radius: 30px;
  font-weight: 600;
  font-size: 15px;
  box-shadow: var(--shadow-md);
  transition: all 0.2s;
  cursor: pointer;
  border: none;
  text-decoration: none;
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  color: #fff;
}
.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  color: var(--primary);
  padding: 11px 26px;
  border-radius: 30px;
  font-weight: 600;
  font-size: 15px;
  border: 2px solid var(--primary);
  transition: all 0.2s;
  text-decoration: none;
}
.btn-outline:hover {
  background: var(--primary);
  color: #fff;
}

/* ===================== FEATURES ===================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
}
.feature-card {
  background: #fff;
  border-radius: var(--radius-md);
  padding: 28px 24px;
  border: 1px solid var(--border);
  transition: all 0.3s;
}
.feature-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: var(--primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: 16px;
}
.feature-card h4 {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}
.feature-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ===================== ARTICLE LIST ===================== */
.article-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 24px;
}
.article-card {
  background: #fff;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  overflow: hidden;
  transition: all 0.3s;
}
.article-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
  border-color: var(--primary);
}
.article-card-body { padding: 20px; }
.article-tag {
  display: inline-block;
  padding: 3px 10px;
  background: var(--primary-light);
  color: var(--primary);
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 10px;
}
.article-card h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.article-card h3 a { color: inherit; }
.article-card h3 a:hover { color: var(--primary); }
.article-excerpt {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 12px;
}
.article-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 12px;
  color: var(--text-muted);
}
.article-meta span { display: flex; align-items: center; gap: 4px; }

/* ===================== ARTICLE DETAIL ===================== */
.article-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 32px;
  align-items: start;
}
.article-content {
  background: #fff;
  border-radius: var(--radius-md);
  padding: 40px;
  border: 1px solid var(--border);
}
.article-content h1 {
  font-size: 28px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
  line-height: 1.4;
}
.article-content h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
  margin: 32px 0 16px;
  padding-left: 12px;
  border-left: 4px solid var(--primary);
}
.article-content h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  margin: 24px 0 12px;
}
.article-content p {
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 16px;
}
.article-content ul, .article-content ol {
  margin: 16px 0 16px 24px;
  color: var(--text-secondary);
  line-height: 1.8;
}
.article-content li { margin-bottom: 6px; }
.article-content ul li { list-style: disc; }
.article-content ol li { list-style: decimal; }
.article-info-bar {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 12px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  margin-bottom: 28px;
  font-size: 13px;
  color: var(--text-muted);
}
.article-info-bar span { display: flex; align-items: center; gap: 5px; }

/* Sidebar */
.sidebar { display: flex; flex-direction: column; gap: 24px; }
.sidebar-card {
  background: #fff;
  border-radius: var(--radius-md);
  padding: 24px;
  border: 1px solid var(--border);
}
.sidebar-card h4 {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--primary-light);
}
.sidebar-links li {
  padding: 8px 0;
  border-bottom: 1px solid var(--bg-light);
}
.sidebar-links li:last-child { border-bottom: none; }
.sidebar-links a {
  font-size: 14px;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 6px;
}
.sidebar-links a:hover { color: var(--primary); }
.sidebar-download-box {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  border-radius: var(--radius-md);
  padding: 24px;
  text-align: center;
  color: #fff;
}
.sidebar-download-box h4 { color: #fff; border-bottom-color: rgba(255,255,255,0.2); }
.sidebar-download-box p { font-size: 13px; opacity: 0.85; margin-bottom: 16px; }
.sidebar-download-box .btn-download { width: 100%; justify-content: center; }

/* ===================== STATS ===================== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.stat-card {
  text-align: center;
  padding: 32px 16px;
  background: #fff;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}
.stat-number {
  font-size: 40px;
  font-weight: 800;
  color: var(--primary);
  line-height: 1;
  margin-bottom: 8px;
}
.stat-label {
  font-size: 14px;
  color: var(--text-secondary);
}

/* ===================== STEPS ===================== */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 0;
  position: relative;
}
.steps-grid::before {
  content: '';
  position: absolute;
  top: 40px;
  left: 10%;
  right: 10%;
  height: 2px;
  background: linear-gradient(90deg, var(--primary-light), var(--primary), var(--primary-light));
}
.step-item {
  text-align: center;
  padding: 0 16px;
  position: relative;
  z-index: 1;
}
.step-num {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  font-size: 28px;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  box-shadow: 0 4px 16px rgba(22,119,255,0.35);
}
.step-item h4 {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}
.step-item p { font-size: 14px; color: var(--text-secondary); }

/* ===================== FAQ ===================== */
.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;
  background: #fff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-weight: 600;
  font-size: 15px;
  color: var(--text-primary);
  transition: background 0.2s;
}
.faq-question:hover { background: var(--primary-light); }
.faq-question.active { background: var(--primary-light); color: var(--primary); }
.faq-icon { font-size: 18px; transition: transform 0.3s; }
.faq-question.active .faq-icon { transform: rotate(45deg); }
.faq-answer {
  display: none;
  padding: 16px 24px 20px;
  background: var(--bg-light);
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}
.faq-answer.open { display: block; }

/* ===================== PAGINATION ===================== */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-top: 48px;
}
.page-btn {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text-secondary);
  font-size: 14px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
  text-decoration: none;
}
.page-btn:hover, .page-btn.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

/* ===================== FOOTER ===================== */
.site-footer {
  background: #0A1628;
  color: rgba(255,255,255,0.75);
  padding: 56px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}
.footer-brand .logo-wrap { margin-bottom: 16px; }
.footer-brand .logo-text { color: #fff; }
.footer-brand p {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(255,255,255,0.6);
  margin-bottom: 20px;
}
.footer-col h5 {
  font-size: 15px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 16px;
}
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a {
  font-size: 14px;
  color: rgba(255,255,255,0.6);
  transition: color 0.2s;
}
.footer-col ul li a:hover { color: #fff; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  margin-top: 40px;
  padding: 20px 24px;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  color: rgba(255,255,255,0.45);
}
.footer-bottom-full {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding: 20px 0;
  text-align: center;
  font-size: 13px;
  color: rgba(255,255,255,0.45);
}

/* ===================== NOTICE BAR ===================== */
.notice-bar {
  background: linear-gradient(90deg, var(--primary), #00AAFF);
  color: #fff;
  text-align: center;
  padding: 10px 24px;
  font-size: 14px;
}
.notice-bar a { color: #fff; text-decoration: underline; }

/* ===================== TAGS ===================== */
.tag-cloud { display: flex; flex-wrap: wrap; gap: 8px; }
.tag {
  padding: 5px 14px;
  background: var(--bg-light);
  border: 1px solid var(--border);
  border-radius: 20px;
  font-size: 13px;
  color: var(--text-secondary);
  transition: all 0.2s;
}
.tag:hover {
  background: var(--primary-light);
  border-color: var(--primary);
  color: var(--primary);
}

/* ===================== TABLE ===================== */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}
.data-table th {
  background: var(--primary);
  color: #fff;
  padding: 12px 16px;
  text-align: left;
  font-weight: 600;
}
.data-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  color: var(--text-secondary);
}
.data-table tr:nth-child(even) td { background: var(--bg-light); }
.data-table tr:hover td { background: var(--primary-light); }

/* ===================== RESPONSIVE ===================== */
@media (max-width: 1024px) {
  .article-layout { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .main-nav { display: none; 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); }
  .main-nav.open { display: flex; }
  .hamburger { display: flex; }
  .header-download { display: none; }
  .slide img { height: 260px; }
  .section { padding: 40px 0; }
  .section-title { font-size: 24px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .steps-grid::before { display: none; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
  .article-content { padding: 24px 16px; }
}
@media (max-width: 480px) {
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .download-grid { grid-template-columns: 1fr; }
  .article-grid { grid-template-columns: 1fr; }
}

/* ===================== UTILITIES ===================== */
.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; }
.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.gap-16 { gap: 16px; }
.badge {
  display: inline-block;
  padding: 2px 8px;
  background: #FFF3CD;
  color: #856404;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 600;
}
.badge-new { background: #D1FAE5; color: #065F46; }
.badge-hot { background: #FEE2E2; color: #991B1B; }