/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; -webkit-text-size-adjust: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: #333333; line-height: 1.7; background: #F7F8FA;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }

/* ===== Container ===== */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ===== Navigation ===== */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(15, 25, 35, 0.97); backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  transition: background 0.3s;
}
.navbar .container {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.nav-logo {
  display: flex; align-items: center; gap: 10px;
  font-size: 22px; font-weight: 700; color: #fff;
}
.nav-logo img { flex-shrink: 0; border-radius: 6px; }
.nav-logo span { color: #2D8C3C; }
.nav-links { display: flex; gap: 32px; align-items: center; }
.nav-links a {
  color: rgba(255,255,255,0.75); font-size: 15px; font-weight: 500;
  transition: color 0.2s;
}
.nav-links a:hover { color: #34A853; }
.nav-download-btn {
  background: #2D8C3C; color: #fff !important; padding: 8px 20px;
  border-radius: 6px; font-weight: 600 !important;
  transition: background 0.2s, transform 0.2s, box-shadow 0.2s;
}
.nav-download-btn:hover {
  background: #34A853; transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(45,140,60,0.4);
}
.mobile-menu-btn {
  display: none; background: none; border: none; cursor: pointer;
  padding: 4px;
}
.mobile-menu-btn span {
  display: block; width: 24px; height: 2px; background: #fff;
  margin: 5px 0; transition: all 0.3s; border-radius: 2px;
}
.mobile-menu {
  display: none; position: fixed; top: 64px; left: 0; right: 0; bottom: 0;
  background: rgba(15,25,35,0.98); z-index: 999; padding: 24px;
  flex-direction: column; gap: 20px;
}
.mobile-menu.active { display: flex; }
.mobile-menu a {
  color: rgba(255,255,255,0.85); font-size: 18px; padding: 12px 0;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.mobile-menu .nav-download-btn {
  text-align: center; margin-top: 12px; font-size: 18px; padding: 14px 20px;
}

/* ===== Hero Section ===== */
.hero {
  position: relative; min-height: 600px; display: flex; align-items: center;
  padding-top: 64px; overflow: hidden;
  background: linear-gradient(135deg, #0F1923 0%, #132a1e 50%, #0F1923 100%);
}
.hero-bg {
  position: absolute; top: 0; left: 0; right: 0; bottom: 0;
  background-image: url('/hero-bg.jpeg');
  background-size: cover; background-position: center;
  opacity: 0.15;
}
.hero::after {
  content: ''; position: absolute; bottom: 0; left: 0; right: 0; height: 120px;
  background: linear-gradient(transparent, #F7F8FA);
}
.hero .container {
  position: relative; z-index: 2; text-align: center; padding: 80px 24px 100px;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(45,140,60,0.15); border: 1px solid rgba(45,140,60,0.3);
  color: #34A853; font-size: 14px; font-weight: 600;
  padding: 6px 16px; border-radius: 20px; margin-bottom: 24px;
}
.hero-badge-dot {
  width: 8px; height: 8px; border-radius: 50%; background: #34A853;
  animation: pulse-dot 2s infinite;
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
}
.hero h1 {
  font-size: 48px; font-weight: 700; color: #fff; line-height: 1.25;
  margin-bottom: 20px; letter-spacing: -0.5px;
}
.hero h1 em { font-style: normal; color: #34A853; }
.hero-desc {
  font-size: 18px; color: rgba(255,255,255,0.7); max-width: 680px;
  margin: 0 auto 36px; line-height: 1.8;
}
.hero-buttons { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn-primary {
  display: inline-flex; align-items: center; gap: 8px;
  background: linear-gradient(135deg, #2D8C3C, #34A853);
  color: #fff; font-size: 17px; font-weight: 600;
  padding: 14px 36px; border-radius: 10px; border: none; cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
  animation: pulse-btn 3s infinite;
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(45,140,60,0.5);
  animation: none;
}
@keyframes pulse-btn {
  0%, 100% { box-shadow: 0 4px 16px rgba(45,140,60,0.3); }
  50% { box-shadow: 0 4px 24px rgba(45,140,60,0.6); }
}
.btn-secondary {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(255,255,255,0.08); border: 1px solid rgba(255,255,255,0.15);
  color: #fff; font-size: 17px; font-weight: 500;
  padding: 14px 32px; border-radius: 10px; cursor: pointer;
  transition: background 0.2s, border-color 0.2s;
}
.btn-secondary:hover {
  background: rgba(255,255,255,0.12); border-color: rgba(255,255,255,0.25);
}
.hero-stats {
  display: flex; justify-content: center; gap: 48px; margin-top: 56px;
  flex-wrap: wrap;
}
.hero-stat { text-align: center; }
.hero-stat-num {
  font-size: 36px; font-weight: 700; color: #34A853;
  font-family: "Inter", -apple-system, sans-serif;
}
.hero-stat-label { font-size: 14px; color: rgba(255,255,255,0.5); margin-top: 4px; }

/* ===== Section Common ===== */
.section { padding: 80px 0; }
.section-alt { background: #fff; }
.section-title {
  font-size: 32px; font-weight: 700; text-align: center; margin-bottom: 12px;
  color: #1a1a1a;
}
.section-subtitle {
  font-size: 16px; color: #666; text-align: center; max-width: 640px;
  margin: 0 auto 48px;
}

/* ===== Features Section ===== */
.features-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}
.feature-card {
  background: #fff; border-radius: 12px; padding: 32px 28px;
  border: 1px solid #E5E7EB; transition: transform 0.2s, border-color 0.2s, box-shadow 0.2s;
}
.feature-card:hover {
  transform: translateY(-2px); border-color: #2D8C3C;
  box-shadow: 0 8px 24px rgba(0,0,0,0.06);
}
.feature-icon {
  width: 52px; height: 52px; border-radius: 12px;
  background: linear-gradient(135deg, rgba(45,140,60,0.1), rgba(52,168,83,0.1));
  display: flex; align-items: center; justify-content: center;
  font-size: 24px; margin-bottom: 20px;
}
.feature-card h3 {
  font-size: 18px; font-weight: 600; margin-bottom: 10px; color: #1a1a1a;
}
.feature-card p { font-size: 14px; color: #666; line-height: 1.7; }

/* ===== Format Section ===== */
.format-tags {
  display: flex; flex-wrap: wrap; gap: 12px; justify-content: center;
}
.format-tag {
  background: #fff; border: 1px solid #E5E7EB; padding: 10px 20px;
  border-radius: 8px; font-size: 14px; font-weight: 600; color: #333;
  font-family: "Inter", -apple-system, sans-serif;
  transition: border-color 0.2s, color 0.2s, background 0.2s;
}
.format-tag:hover {
  border-color: #2D8C3C; color: #2D8C3C;
  background: rgba(45,140,60,0.04);
}
.format-tag-primary {
  background: linear-gradient(135deg, #2D8C3C, #34A853);
  color: #fff; border-color: transparent;
}
.format-tag-primary:hover {
  background: linear-gradient(135deg, #248334, #2D9A4A);
  color: #fff;
}

/* ===== Download Section ===== */
.download-cards {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}
.download-card {
  background: #fff; border-radius: 12px; padding: 36px 28px;
  border: 1px solid #E5E7EB; text-align: center;
  transition: transform 0.2s, border-color 0.2s, box-shadow 0.2s;
}
.download-card:hover {
  transform: translateY(-2px); border-color: #2D8C3C;
  box-shadow: 0 8px 24px rgba(0,0,0,0.06);
}
.download-card.recommended {
  border-color: #2D8C3C; position: relative;
}
.download-card.recommended::before {
  content: '推荐'; position: absolute; top: -12px; left: 50%; transform: translateX(-50%);
  background: linear-gradient(135deg, #2D8C3C, #34A853);
  color: #fff; font-size: 12px; font-weight: 600;
  padding: 4px 14px; border-radius: 12px;
}
.download-icon {
  font-size: 40px; margin-bottom: 16px;
}
.download-card h3 { font-size: 20px; font-weight: 600; margin-bottom: 8px; }
.download-card .version { font-size: 13px; color: #999; margin-bottom: 20px; }
.download-card .size { font-size: 14px; color: #666; margin-bottom: 24px; }
.btn-download {
  display: inline-flex; align-items: center; gap: 6px;
  background: linear-gradient(135deg, #2D8C3C, #34A853);
  color: #fff; font-size: 15px; font-weight: 600;
  padding: 12px 28px; border-radius: 8px; border: none; cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
}
.btn-download:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(45,140,60,0.4);
}

/* ===== Tutorial Section ===== */
.tutorial-steps {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px;
  counter-reset: step;
}
.tutorial-step {
  background: #fff; border-radius: 12px; padding: 28px 24px;
  border: 1px solid #E5E7EB; position: relative;
  counter-increment: step;
  transition: transform 0.2s, border-color 0.2s;
}
.tutorial-step:hover {
  transform: translateY(-2px); border-color: #2D8C3C;
}
.step-number {
  width: 36px; height: 36px; border-radius: 50%;
  background: linear-gradient(135deg, #2D8C3C, #34A853);
  color: #fff; font-size: 16px; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 16px;
  font-family: "Inter", -apple-system, sans-serif;
}
.tutorial-step h3 { font-size: 16px; font-weight: 600; margin-bottom: 8px; }
.tutorial-step p { font-size: 13px; color: #666; line-height: 1.7; }

/* ===== Comparison Section ===== */
.comparison-table {
  width: 100%; border-collapse: collapse; background: #fff;
  border-radius: 12px; overflow: hidden; border: 1px solid #E5E7EB;
}
.comparison-table th, .comparison-table td {
  padding: 16px 20px; text-align: center; border-bottom: 1px solid #E5E7EB;
}
.comparison-table th {
  background: #0F1923; color: #fff; font-weight: 600; font-size: 14px;
}
.comparison-table th:first-child { text-align: left; }
.comparison-table td:first-child { text-align: left; font-weight: 500; }
.comparison-table tr:last-child td { border-bottom: none; }
.comparison-table .highlight { color: #2D8C3C; font-weight: 600; }
.comparison-table .check { color: #2D8C3C; font-size: 18px; }
.comparison-table .cross { color: #ccc; font-size: 18px; }

/* ===== FAQ Section ===== */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  background: #fff; border: 1px solid #E5E7EB; border-radius: 10px;
  margin-bottom: 12px; overflow: hidden;
  transition: border-color 0.2s;
}
.faq-item:hover { border-color: rgba(45,140,60,0.3); }
.faq-question {
  display: flex; justify-content: space-between; align-items: center;
  padding: 20px 24px; cursor: pointer; font-weight: 600; font-size: 15px;
  transition: color 0.2s;
  user-select: none;
}
.faq-question:hover { color: #2D8C3C; }
.faq-arrow {
  font-size: 12px; transition: transform 0.3s; color: #999; flex-shrink: 0;
  margin-left: 12px;
}
.faq-item.active .faq-arrow { transform: rotate(180deg); }
.faq-answer {
  max-height: 0; overflow: hidden; transition: max-height 0.35s ease;
}
.faq-item.active .faq-answer { max-height: 500px; }
.faq-answer-inner {
  padding: 0 24px 20px; font-size: 14px; color: #666; line-height: 1.8;
}

/* ===== SEO Content Section ===== */
.seo-content {
  background: #fff; border-radius: 12px; padding: 40px; border: 1px solid #E5E7EB;
  font-size: 14px; color: #555; line-height: 2;
}
.seo-content h2 { font-size: 22px; color: #1a1a1a; margin-bottom: 16px; font-weight: 700; }
.seo-content h3 { font-size: 17px; color: #1a1a1a; margin: 20px 0 10px; font-weight: 600; }
.seo-content p { margin-bottom: 14px; }
.seo-content strong { color: #2D8C3C; }

/* ===== Footer ===== */
.footer {
  background: #0F1923; color: rgba(255,255,255,0.6); padding: 48px 0 24px;
}
.footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px;
  margin-bottom: 40px;
}
.footer-brand p { font-size: 14px; line-height: 1.8; margin-top: 12px; }
.footer-col h4 { color: #fff; font-size: 15px; font-weight: 600; margin-bottom: 16px; }
.footer-col a {
  display: block; font-size: 14px; padding: 4px 0;
  transition: color 0.2s;
}
.footer-col a:hover { color: #34A853; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08); padding-top: 24px;
  display: flex; justify-content: space-between; align-items: center;
  font-size: 13px; flex-wrap: wrap; gap: 12px;
}

/* ===== Back to Top ===== */
.back-to-top {
  position: fixed; bottom: 32px; right: 32px; z-index: 900;
  width: 44px; height: 44px; border-radius: 50%;
  background: #2D8C3C; color: #fff; border: none; cursor: pointer;
  display: none; align-items: center; justify-content: center;
  box-shadow: 0 4px 12px rgba(45,140,60,0.4);
  transition: opacity 0.3s, transform 0.3s, background 0.2s;
  opacity: 0;
}
.back-to-top.visible { display: flex; opacity: 1; }
.back-to-top:hover {
  background: #34A853; transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(45,140,60,0.5);
}

/* ===== Smooth scroll offset for fixed nav ===== */
section[id] { scroll-margin-top: 80px; }

/* ===== Breadcrumb ===== */
.breadcrumb {
  padding: 12px 0; font-size: 13px; color: #999;
}
.breadcrumb a { color: #666; transition: color 0.2s; }
.breadcrumb a:hover { color: #2D8C3C; }
.breadcrumb span { margin: 0 6px; }

/* ===== Table scroll hint ===== */
.table-hint { display: none; }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .download-cards { grid-template-columns: repeat(2, 1fr); }
  .tutorial-steps { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .mobile-menu-btn { display: block; }
  .hero { min-height: auto; }
  .hero h1 { font-size: 26px; }
  .hero-desc { font-size: 15px; }
  .hero-stats { gap: 20px; }
  .hero-stat-num { font-size: 26px; }
  .hero-stat-label { font-size: 12px; }
  .section { padding: 48px 0; }
  .section-title { font-size: 22px; }
  .section-subtitle { font-size: 14px; margin-bottom: 32px; }
  .features-grid { grid-template-columns: 1fr; }
  .feature-card { padding: 24px 20px; }
  .download-cards { grid-template-columns: 1fr; max-width: 400px; margin: 0 auto; }
  .download-card { padding: 28px 20px; }
  .tutorial-steps { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .comparison-table { font-size: 12px; min-width: 520px; }
  .comparison-table th, .comparison-table td { padding: 10px 8px; }
  .hero .container { padding: 48px 16px 64px; }
  .btn-primary, .btn-secondary { font-size: 15px; padding: 12px 24px; width: 100%; max-width: 300px; justify-content: center; }
  .hero-buttons { flex-direction: column; align-items: center; gap: 12px; }
  .seo-content { padding: 20px 16px; font-size: 13px; }
  .seo-content h2 { font-size: 18px; }
  .seo-content h3 { font-size: 15px; }
  .format-tags { gap: 8px; }
  .format-tag { padding: 8px 14px; font-size: 13px; }
  .faq-question { font-size: 14px; padding: 16px 18px; }
  .faq-answer-inner { padding: 0 18px 16px; font-size: 13px; }
  .back-to-top { bottom: 20px; right: 16px; width: 40px; height: 40px; }
  .breadcrumb { font-size: 12px; padding: 10px 0; }
  .table-hint { display: block; }
}

@media (max-width: 480px) {
  .hero h1 { font-size: 22px; letter-spacing: -0.3px; }
  .hero-badge { font-size: 12px; padding: 5px 12px; }
  .container { padding: 0 16px; }
  .hero-stat-num { font-size: 22px; }
  .hero-stat-label { font-size: 11px; }
  .hero-stats { gap: 16px; margin-top: 36px; }
  .feature-icon { width: 44px; height: 44px; font-size: 20px; }
  .feature-card h3 { font-size: 16px; }
  .footer-bottom { flex-direction: column; text-align: center; gap: 8px; font-size: 12px; }
  .section-title { font-size: 20px; }
  .download-card h3 { font-size: 18px; }
  .btn-download { width: 100%; justify-content: center; }
  .step-number { width: 32px; height: 32px; font-size: 14px; }
}