/* ========== Base Reset & Variables ========== */
:root {
  --primary: #E60012;
  --primary-dark: #C5000F;
  --primary-light: #FF6B6B;
  --accent: #FF8C00;
  --dark: #0F172A;
  --dark-2: #1E293B;
  --gray-900: #111827;
  --gray-800: #1F2937;
  --gray-700: #374151;
  --gray-600: #4B5563;
  --gray-500: #6B7280;
  --gray-400: #9CA3AF;
  --gray-300: #D1D5DB;
  --gray-200: #E5E7EB;
  --gray-100: #F3F4F6;
  --gray-50: #F9FAFB;
  --white: #FFFFFF;
  --success: #10B981;
  --warning: #F59E0B;
  --info: #3B82F6;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1);
  --shadow-md: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.1);
  --shadow-lg: 0 20px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.1);
  --shadow-xl: 0 25px 50px -12px rgba(0,0,0,0.25);
  --radius-sm: 6px;
  --radius: 12px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--gray-800);
  background: var(--white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

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

button {
  border: none;
  background: none;
  cursor: pointer;
  font-family: inherit;
  transition: var(--transition);
}

ul, ol {
  list-style: none;
}

/* ========== Animation Keyframes ========== */
@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

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

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

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-40px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(40px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

@keyframes float {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-10px); }
}

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

@keyframes gradientShift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

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

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

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

/* ========== Navigation ========== */
.nav-wrapper {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--gray-200);
  transition: var(--transition);
}

.nav-wrapper.scrolled {
  box-shadow: var(--shadow);
  background: rgba(255, 255, 255, 0.95);
}

.navbar {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--dark);
}

.nav-brand svg {
  width: 36px;
  height: 36px;
}

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

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

.nav-link {
  padding: 8px 18px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--gray-600);
  position: relative;
  transition: var(--transition);
}

.nav-link:hover {
  color: var(--primary);
  background: var(--gray-50);
}

.nav-link.active {
  color: var(--primary);
  background: rgba(230, 0, 18, 0.08);
  font-weight: 600;
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 3px;
  background: var(--primary);
  border-radius: 2px;
}

.nav-cta {
  padding: 9px 22px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: var(--white);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  box-shadow: 0 4px 14px rgba(230, 0, 18, 0.35);
}

.nav-cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(230, 0, 18, 0.45);
}

.nav-cta svg {
  width: 16px;
  height: 16px;
}

.mobile-menu-btn {
  display: none;
  padding: 8px;
  border-radius: var(--radius-sm);
}

.mobile-menu-btn:hover {
  background: var(--gray-100);
}

/* ========== Hero Section ========== */
.hero {
  position: relative;
  padding: 140px 24px 100px;
  overflow: hidden;
  background: linear-gradient(180deg, var(--gray-50) 0%, var(--white) 100%);
}

.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero-bg .orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.15;
}

.hero-bg .orb-1 {
  width: 500px;
  height: 500px;
  background: var(--primary);
  top: -100px;
  right: -100px;
}

.hero-bg .orb-2 {
  width: 400px;
  height: 400px;
  background: var(--accent);
  bottom: -50px;
  left: -50px;
}

.hero-container {
  max-width: 1280px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(230, 0, 18, 0.08);
  border: 1px solid rgba(230, 0, 18, 0.15);
  border-radius: 100px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 24px;
}

.hero-badge svg {
  width: 16px;
  height: 16px;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.15;
  color: var(--dark);
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.hero-title .gradient-text {
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 50%, #FF4D00 100%);
  background-size: 200% 200%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: gradientShift 4s ease infinite;
}

.hero-desc {
  font-size: 1.15rem;
  color: var(--gray-600);
  margin-bottom: 36px;
  line-height: 1.7;
  max-width: 520px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: none;
}

.btn svg {
  width: 20px;
  height: 20px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: var(--white);
  box-shadow: 0 8px 24px rgba(230, 0, 18, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(230, 0, 18, 0.45);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background: var(--white);
  color: var(--gray-800);
  border: 2px solid var(--gray-200);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  border-color: var(--gray-300);
  background: var(--gray-50);
  transform: translateY(-2px);
}

.hero-stats {
  display: flex;
  gap: 40px;
}

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

.stat-number {
  font-size: 2rem;
  font-weight: 800;
  color: var(--dark);
  line-height: 1;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--gray-500);
  margin-top: 6px;
}

.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  padding: 32px;
  width: 100%;
  max-width: 520px;
  position: relative;
  animation: float 6s ease-in-out infinite;
}

.hero-card-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--gray-100);
}

.hero-card-dots {
  display: flex;
  gap: 6px;
}

.hero-card-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.hero-card-dot.red { background: #FF5F57; }
.hero-card-dot.yellow { background: #FFBD2E; }
.hero-card-dot.green { background: #28CA42; }

.hero-card-title {
  font-size: 0.9rem;
  color: var(--gray-500);
  font-weight: 500;
}

.hero-card-body {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.mock-line {
  height: 12px;
  border-radius: 6px;
  background: var(--gray-100);
}

.mock-line.short { width: 60%; }

.mock-line.highlight {
  background: linear-gradient(90deg, rgba(230,0,18,0.1) 0%, rgba(255,140,0,0.1) 100%);
  height: 48px;
  border-radius: var(--radius-sm);
}

.mock-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-top: 8px;
}

.mock-cell {
  height: 60px;
  border-radius: var(--radius-sm);
  background: var(--gray-50);
  border: 1px solid var(--gray-100);
}

/* ========== Section Common ========== */
.section {
  padding: 100px 24px;
}

.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 60px;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background: rgba(230, 0, 18, 0.06);
  border: 1px solid rgba(230, 0, 18, 0.1);
  border-radius: 100px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 16px;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--dark);
  margin-bottom: 16px;
  line-height: 1.2;
}

.section-desc {
  font-size: 1.1rem;
  color: var(--gray-600);
  line-height: 1.7;
}

/* ========== Features Section ========== */
.features-grid {
  max-width: 1280px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-md);
  padding: 32px 24px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary) 0%, var(--accent) 100%);
  transform: scaleX(0);
  transition: transform 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--gray-300);
}

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

.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.feature-icon svg {
  width: 26px;
  height: 26px;
}

.feature-icon.red {
  background: rgba(230, 0, 18, 0.08);
  color: var(--primary);
}

.feature-icon.orange {
  background: rgba(255, 140, 0, 0.08);
  color: var(--accent);
}

.feature-icon.blue {
  background: rgba(59, 130, 246, 0.08);
  color: var(--info);
}

.feature-icon.green {
  background: rgba(16, 185, 129, 0.08);
  color: var(--success);
}

.feature-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 10px;
}

.feature-desc {
  font-size: 0.9rem;
  color: var(--gray-600);
  line-height: 1.6;
}

/* ========== Platform Download Section ========== */
.platform-section {
  background: linear-gradient(180deg, var(--gray-50) 0%, var(--white) 50%, var(--gray-50) 100%);
}

.platform-grid {
  max-width: 1280px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.platform-card {
  background: var(--white);
  border-radius: var(--radius-md);
  padding: 36px 28px;
  text-align: center;
  border: 1px solid var(--gray-200);
  transition: var(--transition);
  position: relative;
}

.platform-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--gray-300);
}

.platform-card.featured {
  border: 2px solid var(--primary);
  box-shadow: 0 8px 24px rgba(230, 0, 18, 0.12);
}

.platform-card.featured::before {
  content: '推荐';
  position: absolute;
  top: -1px;
  right: 20px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: var(--white);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 14px;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
}

.platform-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius);
  background: var(--gray-50);
}

.platform-icon svg {
  width: 36px;
  height: 36px;
}

.platform-name {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 6px;
}

.platform-version {
  font-size: 0.85rem;
  color: var(--gray-500);
  margin-bottom: 20px;
}

.platform-btn {
  width: 100%;
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.platform-btn svg {
  width: 18px;
  height: 18px;
}

.platform-btn.btn-primary {
  box-shadow: 0 4px 14px rgba(230, 0, 18, 0.3);
}

.platform-note {
  font-size: 0.8rem;
  color: var(--gray-500);
  margin-top: 14px;
}

/* ========== Reviews Section ========== */
.reviews-grid {
  max-width: 1280px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-md);
  padding: 32px;
  transition: var(--transition);
}

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

.review-stars {
  display: flex;
  gap: 4px;
  margin-bottom: 16px;
}

.review-stars svg {
  width: 18px;
  height: 18px;
  color: var(--warning);
  fill: currentColor;
}

.review-text {
  font-size: 1rem;
  color: var(--gray-700);
  line-height: 1.7;
  margin-bottom: 24px;
}

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

.review-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-weight: 700;
  font-size: 1rem;
}

.review-info {
  display: flex;
  flex-direction: column;
}

.review-name {
  font-weight: 600;
  color: var(--dark);
  font-size: 0.95rem;
}

.review-role {
  font-size: 0.85rem;
  color: var(--gray-500);
}

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

.faq-item {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
  transition: var(--transition);
}

.faq-item:hover {
  border-color: var(--gray-300);
}

.faq-item.active {
  border-color: var(--primary);
  box-shadow: 0 4px 12px rgba(230, 0, 18, 0.08);
}

.faq-question {
  width: 100%;
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  text-align: left;
  font-size: 1rem;
  font-weight: 600;
  color: var(--dark);
  background: none;
  border: none;
  cursor: pointer;
}

.faq-question svg {
  width: 20px;
  height: 20px;
  color: var(--gray-500);
  transition: transform 0.3s ease;
  flex-shrink: 0;
  margin-left: 12px;
}

.faq-item.active .faq-question svg {
  transform: rotate(180deg);
  color: var(--primary);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
}

.faq-item.active .faq-answer {
  max-height: 500px;
  padding: 0 24px 20px;
}

.faq-answer p {
  color: var(--gray-600);
  line-height: 1.7;
  font-size: 0.95rem;
}

/* ========== Comparison Section ========== */
.comparison-table {
  max-width: 900px;
  margin: 0 auto;
  background: var(--white);
  border-radius: var(--radius-md);
  border: 1px solid var(--gray-200);
  overflow: hidden;
}

.comparison-row {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  border-bottom: 1px solid var(--gray-100);
}

.comparison-row:last-child {
  border-bottom: none;
}

.comparison-row.header {
  background: var(--gray-50);
  font-weight: 700;
  color: var(--dark);
}

.comparison-row.header .comparison-cell {
  font-size: 0.9rem;
  padding: 16px 20px;
}

.comparison-cell {
  padding: 14px 20px;
  font-size: 0.9rem;
  color: var(--gray-700);
  display: flex;
  align-items: center;
  gap: 8px;
}

.comparison-cell.feature {
  font-weight: 600;
  color: var(--dark);
}

.comparison-cell .check {
  color: var(--success);
  width: 18px;
  height: 18px;
}

.comparison-cell .cross {
  color: var(--gray-400);
  width: 18px;
  height: 18px;
}

.comparison-cell .partial {
  color: var(--warning);
  width: 18px;
  height: 18px;
}

.comparison-cell.highlight {
  background: rgba(230, 0, 18, 0.03);
  font-weight: 600;
  color: var(--primary);
}

/* ========== CTA Section ========== */
.cta-section {
  background: linear-gradient(135deg, var(--dark) 0%, var(--dark-2) 100%);
  padding: 80px 24px;
  position: relative;
  overflow: hidden;
}

.cta-section .orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.1;
}

.cta-section .orb-1 {
  width: 400px;
  height: 400px;
  background: var(--primary);
  top: -100px;
  left: -100px;
}

.cta-section .orb-2 {
  width: 300px;
  height: 300px;
  background: var(--accent);
  bottom: -50px;
  right: -50px;
}

.cta-container {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
  position: relative;
  z-index: 1;
}

.cta-title {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--white);
  margin-bottom: 16px;
}

.cta-desc {
  font-size: 1.1rem;
  color: var(--gray-400);
  margin-bottom: 36px;
  line-height: 1.7;
}

.cta-btn {
  padding: 16px 48px;
  font-size: 1.1rem;
  box-shadow: 0 8px 32px rgba(230, 0, 18, 0.4);
}

.cta-btn:hover {
  box-shadow: 0 12px 40px rgba(230, 0, 18, 0.55);
}

/* ========== Footer ========== */
.footer {
  background: var(--gray-900);
  color: var(--gray-400);
  padding: 60px 24px 32px;
}

.footer-container {
  max-width: 1280px;
  margin: 0 auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 16px;
}

.footer-brand svg {
  width: 32px;
  height: 32px;
}

.footer-desc {
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--gray-500);
}

.footer-heading {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--white);
  margin-bottom: 20px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-links a {
  font-size: 0.9rem;
  color: var(--gray-500);
  transition: var(--transition);
}

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

.footer-bottom {
  border-top: 1px solid var(--gray-800);
  padding-top: 24px;
  text-align: center;
}

.footer-disclaimer {
  font-size: 0.85rem;
  color: var(--gray-600);
  line-height: 1.7;
  margin-bottom: 8px;
}

.footer-copyright {
  font-size: 0.8rem;
  color: var(--gray-600);
}

/* ========== Download Page Specific ========== */
.download-hero {
  padding: 140px 24px 80px;
  background: linear-gradient(180deg, var(--gray-50) 0%, var(--white) 100%);
  text-align: center;
}

.download-hero .hero-title {
  margin: 0 auto 16px;
}

.download-hero .hero-desc {
  margin: 0 auto 32px;
}

.download-cards {
  max-width: 1280px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  padding: 0 24px 80px;
}

.download-card-main {
  grid-column: 1 / -1;
  background: linear-gradient(135deg, var(--white) 0%, var(--gray-50) 100%);
  border: 2px solid var(--primary);
  border-radius: var(--radius-lg);
  padding: 48px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.download-card-main::before {
  content: 'Windows 推荐版本';
  position: absolute;
  top: 20px;
  right: -45px;
  background: var(--primary);
  color: var(--white);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 6px 50px;
  transform: rotate(45deg);
}

.download-card-main .download-info h2 {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--dark);
  margin-bottom: 12px;
}

.download-card-main .download-info .version-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: rgba(230, 0, 18, 0.08);
  border-radius: 100px;
  font-size: 0.85rem;
  color: var(--primary);
  font-weight: 600;
  margin-bottom: 16px;
}

.download-card-main .download-info p {
  color: var(--gray-600);
  line-height: 1.7;
  margin-bottom: 24px;
}

.download-card-main .download-meta {
  display: flex;
  gap: 24px;
  margin-bottom: 24px;
}

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

.download-meta-label {
  font-size: 0.8rem;
  color: var(--gray-500);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.download-meta-value {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--dark);
}

.download-card-main .download-actions {
  display: flex;
  gap: 12px;
}

.download-card-main .download-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.download-card-main .download-visual .platform-icon-large {
  width: 140px;
  height: 140px;
  background: linear-gradient(135deg, rgba(230,0,18,0.1) 0%, rgba(255,140,0,0.1) 100%);
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
}

.download-card-main .download-visual .platform-icon-large svg {
  width: 72px;
  height: 72px;
  color: var(--primary);
}

.download-card-secondary {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-md);
  padding: 36px;
  text-align: center;
  transition: var(--transition);
}

.download-card-secondary:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--gray-300);
}

.download-card-secondary .platform-icon {
  width: 72px;
  height: 72px;
  margin: 0 auto 20px;
  background: var(--gray-50);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
}

.download-card-secondary .platform-icon svg {
  width: 40px;
  height: 40px;
}

.download-card-secondary h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 8px;
}

.download-card-secondary .version {
  font-size: 0.9rem;
  color: var(--gray-500);
  margin-bottom: 20px;
}

.download-card-secondary .desc {
  font-size: 0.9rem;
  color: var(--gray-600);
  line-height: 1.6;
  margin-bottom: 24px;
}

.download-card-secondary .btn {
  width: 100%;
}

/* ========== SEO Page Specific ========== */
.seo-article {
  max-width: 900px;
  margin: 0 auto;
  padding: 140px 24px 80px;
}

.seo-breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--gray-500);
  margin-bottom: 32px;
}

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

.seo-breadcrumb svg {
  width: 14px;
  height: 14px;
  color: var(--gray-400);
}

.seo-title {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--dark);
  margin-bottom: 20px;
  line-height: 1.2;
}

.seo-meta {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-bottom: 40px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--gray-200);
}

.seo-meta-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--gray-500);
}

.seo-meta-item svg {
  width: 16px;
  height: 16px;
}

.seo-content h2 {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--dark);
  margin: 48px 0 20px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--gray-100);
}

.seo-content h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--gray-800);
  margin: 32px 0 14px;
}

.seo-content p {
  font-size: 1rem;
  color: var(--gray-700);
  line-height: 1.8;
  margin-bottom: 16px;
}

.seo-content ul, .seo-content ol {
  margin: 16px 0 16px 24px;
  color: var(--gray-700);
}

.seo-content ul li, .seo-content ol li {
  margin-bottom: 10px;
  line-height: 1.7;
  position: relative;
}

.seo-content ul li::marker {
  color: var(--primary);
}

.seo-content strong {
  color: var(--dark);
  font-weight: 600;
}

.seo-content a {
  color: var(--primary);
  text-decoration: underline;
  text-underline-offset: 2px;
}

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

.seo-highlight-box {
  background: linear-gradient(135deg, rgba(230,0,18,0.04) 0%, rgba(255,140,0,0.04) 100%);
  border: 1px solid rgba(230, 0, 18, 0.12);
  border-radius: var(--radius);
  padding: 24px;
  margin: 24px 0;
}

.seo-highlight-box h4 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.seo-highlight-box h4 svg {
  width: 20px;
  height: 20px;
  color: var(--primary);
}

.seo-cta-box {
  background: linear-gradient(135deg, var(--dark) 0%, var(--dark-2) 100%);
  border-radius: var(--radius-md);
  padding: 40px;
  text-align: center;
  margin: 48px 0;
  position: relative;
  overflow: hidden;
}

.seo-cta-box h3 {
  color: var(--white);
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 12px;
  margin-top: 0;
}

.seo-cta-box p {
  color: var(--gray-400);
  margin-bottom: 24px;
}

.seo-table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 0.95rem;
}

.seo-table th {
  background: var(--gray-50);
  padding: 14px 16px;
  text-align: left;
  font-weight: 600;
  color: var(--dark);
  border-bottom: 2px solid var(--gray-200);
}

.seo-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--gray-100);
  color: var(--gray-700);
}

.seo-table tr:hover td {
  background: var(--gray-50);
}

/* ========== Version History ========== */
.version-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin: 24px 0;
}

.version-item {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 20px 24px;
  display: flex;
  align-items: flex-start;
  gap: 16px;
  transition: var(--transition);
}

.version-item:hover {
  border-color: var(--gray-300);
  box-shadow: var(--shadow);
}

.version-badge {
  flex-shrink: 0;
  padding: 4px 12px;
  background: var(--primary);
  color: var(--white);
  border-radius: 100px;
  font-size: 0.8rem;
  font-weight: 700;
}

.version-content h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--dark);
  margin-bottom: 6px;
}

.version-content p {
  font-size: 0.9rem;
  color: var(--gray-600);
  margin-bottom: 0;
}

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

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

/* ========== Responsive ========== */
@media (max-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .platform-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  .comparison-row {
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .hero-container {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero-title {
    font-size: 2.5rem;
  }
  .hero-desc {
    margin-left: auto;
    margin-right: auto;
  }
  .hero-stats {
    justify-content: center;
  }
  .hero-visual {
    order: -1;
  }
  .hero-card {
    max-width: 400px;
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .platform-grid {
    grid-template-columns: 1fr;
  }
  .reviews-grid {
    grid-template-columns: 1fr;
  }
  .download-cards {
    grid-template-columns: 1fr;
  }
  .download-card-main {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .download-card-main::before {
    display: none;
  }
  .download-card-main .download-actions {
    justify-content: center;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .comparison-row {
    grid-template-columns: 1fr;
  }
  .comparison-row.header {
    display: none;
  }
  .comparison-cell {
    padding: 8px 16px;
  }
  .comparison-cell.feature {
    background: var(--gray-50);
    font-weight: 700;
  }
  .section {
    padding: 60px 20px;
  }
  .cta-title {
    font-size: 1.75rem;
  }
  .seo-title {
    font-size: 1.75rem;
  }
  .section-title {
    font-size: 1.75rem;
  }
  .nav-menu {
    display: none;
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    background: var(--white);
    flex-direction: column;
    padding: 16px;
    border-bottom: 1px solid var(--gray-200);
    box-shadow: var(--shadow-lg);
    gap: 4px;
  }
  .nav-menu.open {
    display: flex;
  }
  .nav-link {
    width: 100%;
    text-align: center;
    padding: 12px;
  }
  .nav-link.active::after {
    display: none;
  }
  .mobile-menu-btn {
    display: block;
  }
  .nav-cta-wrapper {
    display: none;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 2rem;
  }
  .hero-actions {
    flex-direction: column;
    align-items: center;
  }
  .btn {
    width: 100%;
    justify-content: center;
  }
  .hero-stats {
    gap: 24px;
  }
  .stat-number {
    font-size: 1.5rem;
  }
}