/* ===== SET 1: 深蓝科技风 ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --blue-dark: #1e3a8a;
  --blue-mid: #2563eb;
  --blue-light: #3b82f6;
  --blue-pale: #dbeafe;
  --accent: #f59e0b;
  --text-dark: #0f172a;
  --text-mid: #334155;
  --text-light: #64748b;
  --bg-light: #f8fafc;
  --border: #e2e8f0;
  --white: #ffffff;
  --radius: 10px;
  --shadow: 0 4px 24px rgba(30,58,138,0.10);
  --shadow-lg: 0 12px 40px rgba(30,58,138,0.16);
}

body { font-family: 'PingFang SC','Microsoft YaHei',sans-serif; color: var(--text-dark); background: var(--white); line-height: 1.7; }

/* ===== NAVBAR ===== */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(30,58,138,0.97); backdrop-filter: blur(8px);
  height: 64px; display: flex; align-items: center;
  box-shadow: 0 2px 16px rgba(30,58,138,0.25);
}
.nav-inner { max-width: 1200px; margin: 0 auto; width: 100%; padding: 0 24px; display: flex; align-items: center; justify-content: space-between; }
.nav-logo { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.nav-logo-text { color: var(--white); font-size: 20px; font-weight: 700; letter-spacing: 1px; }
.nav-links { display: flex; gap: 6px; list-style: none; }
.nav-links a { color: rgba(255,255,255,0.82); text-decoration: none; padding: 8px 16px; border-radius: 6px; font-size: 14px; font-weight: 500; transition: background 0.2s, color 0.2s; }
.nav-links a:hover { background: rgba(255,255,255,0.12); color: #fff; }
.nav-links a.active { background: var(--blue-light); color: #fff; }
.nav-cta { background: var(--accent); color: var(--text-dark) !important; font-weight: 700 !important; border-radius: 6px; }
.nav-cta:hover { background: #fbbf24 !important; }

/* ===== HERO ===== */
.hero {
  min-height: 100vh; padding-top: 64px;
  background: linear-gradient(135deg, #0f172a 0%, #1e3a8a 45%, #2563eb 100%);
  display: flex; align-items: center; justify-content: center;
  text-align: center; position: relative; overflow: hidden;
}
.hero::before {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(circle at 30% 50%, rgba(59,130,246,0.25) 0%, transparent 60%),
              radial-gradient(circle at 70% 30%, rgba(245,158,11,0.12) 0%, transparent 50%);
}
.hero-inner { position: relative; max-width: 860px; padding: 80px 24px; }
.hero-badge { display: inline-block; background: rgba(255,255,255,0.12); border: 1px solid rgba(255,255,255,0.2); color: #bfdbfe; font-size: 13px; padding: 4px 16px; border-radius: 99px; margin-bottom: 24px; }
.hero h1 { font-size: clamp(32px,5vw,60px); font-weight: 800; color: #fff; line-height: 1.2; margin-bottom: 20px; }
.hero h1 span { color: var(--accent); }
.hero p { font-size: clamp(15px,2vw,20px); color: rgba(255,255,255,0.78); max-width: 600px; margin: 0 auto 36px; }
.hero-btns { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.btn-primary { background: var(--accent); color: #0f172a; font-size: 16px; font-weight: 700; padding: 14px 36px; border-radius: 8px; border: none; cursor: pointer; transition: transform 0.15s, box-shadow 0.15s; box-shadow: 0 4px 16px rgba(245,158,11,0.4); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(245,158,11,0.5); }
.btn-ghost { background: transparent; color: #fff; font-size: 15px; font-weight: 600; padding: 13px 28px; border-radius: 8px; border: 2px solid rgba(255,255,255,0.35); cursor: pointer; transition: border-color 0.2s, background 0.2s; }
.btn-ghost:hover { border-color: #fff; background: rgba(255,255,255,0.08); }
.hero-stats { margin-top: 56px; display: flex; gap: 40px; justify-content: center; flex-wrap: wrap; }
.hero-stat { text-align: center; }
.hero-stat-num { font-size: 28px; font-weight: 800; color: var(--accent); }
.hero-stat-label { font-size: 13px; color: rgba(255,255,255,0.6); margin-top: 4px; }

/* ===== SECTIONS ===== */
section { padding: 80px 24px; }
.section-inner { max-width: 1200px; margin: 0 auto; }
.section-header { text-align: center; margin-bottom: 56px; }
.section-tag { display: inline-block; background: var(--blue-pale); color: var(--blue-mid); font-size: 12px; font-weight: 700; padding: 4px 14px; border-radius: 99px; margin-bottom: 12px; letter-spacing: 1px; text-transform: uppercase; }
.section-header h2 { font-size: clamp(24px,3.5vw,40px); font-weight: 800; color: var(--text-dark); margin-bottom: 14px; }
.section-header p { color: var(--text-light); font-size: 16px; max-width: 600px; margin: 0 auto; }

/* ===== FEATURES GRID ===== */
.features-section { background: var(--bg-light); }
.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.feature-card { background: var(--white); border-radius: var(--radius); padding: 32px 28px; border: 1px solid var(--border); transition: box-shadow 0.2s, transform 0.2s; }
.feature-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-4px); }
.feature-icon { width: 52px; height: 52px; background: var(--blue-pale); border-radius: 12px; display: flex; align-items: center; justify-content: center; margin-bottom: 18px; }
.feature-icon svg { width: 28px; height: 28px; color: var(--blue-mid); }
.feature-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 10px; color: var(--text-dark); }
.feature-card p { font-size: 14px; color: var(--text-mid); line-height: 1.7; }

/* ===== DOWNLOAD PLATFORMS ===== */
.platforms-section { background: var(--white); }
.platforms-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.platform-card { background: var(--bg-light); border: 2px solid var(--border); border-radius: var(--radius); padding: 28px 20px; text-align: center; transition: border-color 0.2s, box-shadow 0.2s; }
.platform-card:hover { border-color: var(--blue-light); box-shadow: var(--shadow); }
.platform-icon { margin-bottom: 14px; }
.platform-icon svg { width: 44px; height: 44px; }
.platform-card h3 { font-size: 17px; font-weight: 700; margin-bottom: 8px; }
.platform-card p { font-size: 13px; color: var(--text-light); margin-bottom: 18px; }
.platform-card button { width: 100%; background: var(--blue-dark); color: #fff; border: none; border-radius: 7px; padding: 12px; font-size: 14px; font-weight: 600; cursor: pointer; transition: background 0.2s; }
.platform-card button:hover { background: var(--blue-mid); }
.platform-card.win button { background: var(--blue-mid); }
.platform-card.win button:hover { background: var(--blue-dark); }

/* ===== DEEP FEATURE ===== */
.deep-feature-section { background: var(--bg-light); }
.deep-feature { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; margin-bottom: 60px; }
.deep-feature:last-child { margin-bottom: 0; }
.deep-feature.reverse { direction: rtl; }
.deep-feature.reverse > * { direction: ltr; }
.deep-feature-text h2 { font-size: 28px; font-weight: 800; margin-bottom: 14px; color: var(--text-dark); }
.deep-feature-text p { color: var(--text-mid); font-size: 15px; margin-bottom: 12px; line-height: 1.75; }
.deep-feature-text ul { list-style: none; margin-top: 16px; }
.deep-feature-text ul li { padding: 6px 0; font-size: 14px; color: var(--text-mid); display: flex; align-items: flex-start; gap: 8px; }
.deep-feature-text ul li::before { content: ''; display: inline-block; width: 6px; height: 6px; background: var(--blue-mid); border-radius: 50%; margin-top: 8px; flex-shrink: 0; }
.deep-feature-visual { background: linear-gradient(135deg, var(--blue-pale), #c7d2fe); border-radius: 16px; min-height: 280px; display: flex; align-items: center; justify-content: center; }
.deep-feature-visual svg { width: 120px; height: 120px; opacity: 0.6; }

/* ===== STATS ===== */
.stats-section { background: linear-gradient(135deg, var(--blue-dark), var(--blue-mid)); }
.stats-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 32px; text-align: center; }
.stat-item { }
.stat-num { font-size: 48px; font-weight: 900; color: var(--white); line-height: 1; }
.stat-unit { font-size: 20px; color: var(--accent); }
.stat-label { font-size: 14px; color: rgba(255,255,255,0.7); margin-top: 6px; }

/* ===== REVIEWS ===== */
.reviews-section { background: var(--white); }
.reviews-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 24px; }
.review-card { background: var(--bg-light); border-radius: var(--radius); padding: 28px 24px; border: 1px solid var(--border); }
.review-stars { color: #f59e0b; font-size: 18px; margin-bottom: 12px; display: flex; gap: 3px; }
.review-text { font-size: 14px; color: var(--text-mid); line-height: 1.75; margin-bottom: 16px; font-style: italic; }
.reviewer { display: flex; align-items: center; gap: 12px; }
.reviewer-avatar { width: 36px; height: 36px; background: var(--blue-pale); border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 14px; font-weight: 700; color: var(--blue-mid); }
.reviewer-name { font-size: 14px; font-weight: 700; }
.reviewer-role { font-size: 12px; color: var(--text-light); }

/* ===== COMPARE TABLE ===== */
.compare-section { background: var(--bg-light); }
.compare-table { width: 100%; border-collapse: collapse; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }
.compare-table th { padding: 16px 20px; font-size: 15px; font-weight: 700; }
.compare-table td { padding: 14px 20px; font-size: 14px; border-bottom: 1px solid var(--border); }
.compare-table tr:last-child td { border-bottom: none; }
.compare-table thead { background: var(--blue-dark); color: #fff; }
.compare-table thead th:first-child { text-align: left; }
.compare-table thead th { text-align: center; }
.compare-table tbody tr:nth-child(odd) { background: var(--white); }
.compare-table tbody tr:nth-child(even) { background: var(--bg-light); }
.compare-table td:first-child { font-weight: 600; color: var(--text-dark); }
.compare-table td:not(:first-child) { text-align: center; }
.check { color: #16a34a; font-size: 18px; }
.cross { color: #dc2626; font-size: 18px; }
.wps-col { background: rgba(37,99,235,0.06) !important; }

/* ===== FAQ ===== */
.faq-section { background: var(--white); }
.faq-list { max-width: 860px; margin: 0 auto; }
.faq-item { border-bottom: 1px solid var(--border); }
.faq-q { display: flex; justify-content: space-between; align-items: center; padding: 20px 0; cursor: pointer; font-weight: 700; font-size: 16px; color: var(--text-dark); user-select: none; }
.faq-q .faq-icon { width: 24px; height: 24px; flex-shrink: 0; transition: transform 0.3s; }
.faq-item input[type="checkbox"] { display: none; }
.faq-item input:checked ~ .faq-q .faq-icon { transform: rotate(45deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height 0.35s ease; }
.faq-item input:checked ~ .faq-a { max-height: 400px; }
.faq-a-inner { padding: 0 0 20px; font-size: 14px; color: var(--text-mid); line-height: 1.8; }

/* ===== FOOTER ===== */
footer { background: var(--blue-dark); color: rgba(255,255,255,0.75); padding: 40px 24px 28px; text-align: center; }
.footer-inner { max-width: 1200px; margin: 0 auto; }
.footer-logo { font-size: 18px; font-weight: 700; color: #fff; margin-bottom: 12px; }
.footer-security { display: inline-flex; align-items: center; gap: 8px; background: rgba(255,255,255,0.08); border: 1px solid rgba(255,255,255,0.15); padding: 10px 20px; border-radius: 8px; font-size: 13px; color: rgba(255,255,255,0.8); margin-bottom: 16px; }
.footer-copyright { font-size: 12px; color: rgba(255,255,255,0.5); line-height: 1.6; }

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

/* ===== DOWNLOAD PAGE ===== */
.dl-hero { padding-top: 64px; background: linear-gradient(135deg, #0f172a 0%, #1e3a8a 60%, #1d4ed8 100%); min-height: 320px; display: flex; align-items: center; }
.dl-hero-inner { max-width: 1200px; margin: 0 auto; padding: 60px 24px; text-align: center; }
.dl-hero h1 { font-size: clamp(28px,4vw,48px); font-weight: 800; color: #fff; margin-bottom: 12px; }
.dl-hero p { color: rgba(255,255,255,0.75); font-size: 16px; }
.dl-main { background: var(--bg-light); }
.dl-win-card { background: var(--white); border-radius: 16px; padding: 48px 40px; box-shadow: var(--shadow-lg); max-width: 700px; margin: 0 auto 48px; border-top: 4px solid var(--blue-mid); }
.dl-win-card h2 { font-size: 26px; font-weight: 800; margin-bottom: 8px; }
.dl-win-card .ver-info { font-size: 13px; color: var(--text-light); margin-bottom: 24px; }
.dl-big-btn { display: inline-flex; align-items: center; gap: 10px; background: var(--blue-mid); color: #fff; border: none; border-radius: 10px; padding: 18px 48px; font-size: 18px; font-weight: 700; cursor: pointer; transition: background 0.2s, transform 0.15s; box-shadow: 0 6px 20px rgba(37,99,235,0.4); }
.dl-big-btn:hover { background: var(--blue-dark); transform: translateY(-2px); }
.sys-req { display: flex; gap: 24px; flex-wrap: wrap; margin-top: 20px; font-size: 13px; color: var(--text-light); }
.sys-req span { display: flex; align-items: center; gap: 6px; }
.platforms-dl { display: grid; grid-template-columns: repeat(3,1fr); gap: 24px; max-width: 1000px; margin: 0 auto 60px; }
.platform-dl-card { background: var(--white); border-radius: 12px; padding: 32px 24px; border: 1px solid var(--border); text-align: center; box-shadow: var(--shadow); }
.platform-dl-card h3 { font-size: 19px; font-weight: 700; margin: 14px 0 8px; }
.platform-dl-card .ver-meta { font-size: 12px; color: var(--text-light); margin-bottom: 6px; }
.platform-dl-card p { font-size: 13px; color: var(--text-mid); margin-bottom: 18px; line-height: 1.6; }
.platform-dl-card button { background: var(--blue-dark); color: #fff; border: none; border-radius: 8px; padding: 12px 28px; font-size: 14px; font-weight: 600; cursor: pointer; transition: background 0.2s; width: 100%; }
.platform-dl-card button:hover { background: var(--blue-mid); }
.install-guide { background: var(--white); border-radius: 12px; padding: 40px; box-shadow: var(--shadow); max-width: 860px; margin: 0 auto 48px; }
.install-guide h2 { font-size: 22px; font-weight: 800; margin-bottom: 28px; color: var(--text-dark); }
.guide-steps { }
.guide-step { display: flex; gap: 20px; margin-bottom: 28px; }
.guide-step:last-child { margin-bottom: 0; }
.step-num { width: 36px; height: 36px; background: var(--blue-mid); color: #fff; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: 800; font-size: 14px; flex-shrink: 0; }
.step-body h4 { font-size: 16px; font-weight: 700; margin-bottom: 6px; }
.step-body p { font-size: 14px; color: var(--text-mid); line-height: 1.7; }
.sysreq-table { width: 100%; border-collapse: collapse; border-radius: 10px; overflow: hidden; }
.sysreq-table th { background: var(--blue-dark); color: #fff; padding: 12px 16px; text-align: left; font-size: 14px; }
.sysreq-table td { padding: 12px 16px; border-bottom: 1px solid var(--border); font-size: 14px; }
.sysreq-table tr:nth-child(even) td { background: var(--bg-light); }
.changelog-list { list-style: none; }
.changelog-item { padding: 18px 0; border-bottom: 1px solid var(--border); }
.changelog-item:last-child { border-bottom: none; }
.changelog-ver { font-weight: 800; color: var(--blue-mid); font-size: 15px; }
.changelog-date { font-size: 12px; color: var(--text-light); margin-left: 12px; }
.changelog-desc { font-size: 14px; color: var(--text-mid); margin-top: 6px; line-height: 1.7; }
.security-box { background: linear-gradient(135deg, var(--blue-pale), #e0e7ff); border-radius: 12px; padding: 32px; display: flex; gap: 20px; align-items: flex-start; border: 1px solid #bfdbfe; }
.security-box svg { width: 40px; height: 40px; color: var(--blue-mid); flex-shrink: 0; }
.security-box h3 { font-size: 16px; font-weight: 700; margin-bottom: 8px; }
.security-box p { font-size: 14px; color: var(--text-mid); line-height: 1.7; }

/* ===== ZH-CN PAGE ===== */
.zh-hero { padding-top: 64px; background: linear-gradient(135deg, #0f172a, #1e3a8a); min-height: 280px; display: flex; align-items: center; }
.zh-hero-inner { max-width: 1000px; margin: 0 auto; padding: 60px 24px; }
.zh-hero h1 { font-size: clamp(26px,3.5vw,44px); font-weight: 800; color: #fff; margin-bottom: 12px; }
.zh-hero p { color: rgba(255,255,255,0.72); font-size: 16px; max-width: 700px; }
.zh-content { max-width: 1000px; margin: 0 auto; padding: 60px 24px; }
.zh-content h2 { font-size: 24px; font-weight: 800; margin-bottom: 14px; color: var(--text-dark); border-left: 4px solid var(--blue-mid); padding-left: 16px; }
.zh-content h3 { font-size: 18px; font-weight: 700; margin-bottom: 10px; color: var(--text-dark); }
.zh-content p { font-size: 15px; color: var(--text-mid); line-height: 1.85; margin-bottom: 14px; }
.zh-content ul { list-style: none; margin-bottom: 20px; }
.zh-content ul li { padding: 5px 0; font-size: 15px; color: var(--text-mid); display: flex; align-items: flex-start; gap: 10px; }
.zh-content ul li::before { content: ''; display: inline-block; width: 5px; height: 5px; background: var(--blue-mid); border-radius: 50%; margin-top: 10px; flex-shrink: 0; }
.zh-section { margin-bottom: 48px; padding-bottom: 48px; border-bottom: 1px solid var(--border); }
.zh-section:last-of-type { border-bottom: none; }
.cta-banner { background: linear-gradient(135deg, var(--blue-dark), var(--blue-mid)); border-radius: 16px; padding: 48px 40px; text-align: center; margin: 48px 0; }
.cta-banner h2 { font-size: 28px; font-weight: 800; color: #fff; margin-bottom: 12px; }
.cta-banner p { color: rgba(255,255,255,0.78); margin-bottom: 28px; font-size: 15px; }
.cta-banner a { display: inline-block; background: var(--accent); color: #0f172a; font-weight: 700; font-size: 18px; padding: 16px 48px; border-radius: 10px; text-decoration: none; transition: transform 0.15s, box-shadow 0.15s; box-shadow: 0 4px 16px rgba(245,158,11,0.4); }
.cta-banner a:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(245,158,11,0.5); }
.ver-table { width: 100%; border-collapse: collapse; border-radius: 10px; overflow: hidden; margin-bottom: 20px; }
.ver-table th { background: var(--blue-dark); color: #fff; padding: 12px 16px; text-align: left; font-size: 14px; }
.ver-table td { padding: 12px 16px; border-bottom: 1px solid var(--border); font-size: 14px; color: var(--text-mid); }
.ver-table tr:nth-child(even) td { background: var(--bg-light); }
.tip-grid { display: grid; grid-template-columns: repeat(2,1fr); gap: 16px; }
.tip-card { background: var(--bg-light); border-radius: 10px; padding: 20px; border: 1px solid var(--border); }
.tip-card h4 { font-size: 15px; font-weight: 700; margin-bottom: 8px; color: var(--text-dark); }
.tip-card p { font-size: 13px; color: var(--text-mid); line-height: 1.7; }

/* ===== RESPONSIVE ===== */
@media (max-width: 900px) {
  .features-grid { grid-template-columns: repeat(2,1fr); }
  .reviews-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2,1fr); }
  .deep-feature { grid-template-columns: 1fr; gap: 30px; }
  .deep-feature.reverse { direction: ltr; }
  .platforms-grid { grid-template-columns: repeat(2,1fr); }
  .platforms-dl { grid-template-columns: 1fr; }
  .tip-grid { grid-template-columns: 1fr; }
}
@media (max-width: 600px) {
  .features-grid { grid-template-columns: 1fr; }
  .platforms-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2,1fr); }
  .hero-stats { gap: 24px; }
  .dl-win-card { padding: 28px 20px; }
  .cta-banner { padding: 32px 20px; }
  .nav-links { display: none; }
}