* { margin: 0; padding: 0; box-sizing: border-box; }
  
  :root {
    --text-primary: #1d1d1f;
    --text-secondary: #6e6e73;
    --text-tertiary: #86868b;
    --bg: #ffffff;
    --bg-secondary: #f5f5f7;
    --bg-tertiary: #fbfbfd;
    --border: #d2d2d7;
    --accent: #0071e3;
    --accent-hover: #0077ed;
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 24px rgba(0,0,0,0.08);
    --shadow-lg: 0 8px 40px rgba(0,0,0,0.12);
    --radius: 18px;
    --radius-sm: 12px;
    --max-w: 780px;
  --max-w-wide: 1120px;
  }

  body {
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Text', 'Helvetica Neue', 'PingFang SC', 'Noto Sans SC', sans-serif;
    color: var(--text-primary);
    background: var(--bg);
    -webkit-font-smoothing: antialiased;
    line-height: 1.6;
  }

  /* ===== NAV ===== */
  nav {
    position: fixed; top: 0; left: 0; right: 0; z-index: 100;
    background: rgba(255,255,255,0.72);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid rgba(0,0,0,0.06);
    transition: background 0.3s;
  }
  .nav-inner {
    max-width: var(--max-w); margin: 0 auto;
    display: flex; align-items: center; justify-content: space-between;
    padding: 0 24px; height: 52px;
  }
  .nav-logo {
    font-size: 18px; font-weight: 700; color: var(--text-primary);
    text-decoration: none; display: flex; align-items: center; gap: 8px;
  }
  .nav-logo span { color: var(--accent); }
  .nav-links { display: flex; gap: 32px; list-style: none; }
  .nav-links a {
    text-decoration: none; color: var(--text-secondary);
    font-size: 14px; font-weight: 500; transition: color 0.2s;
  }
  .nav-links a:hover { color: var(--text-primary); }
  .nav-cta {
    background: var(--accent); color: #fff; border: none;
    padding: 8px 20px; border-radius: 980px; font-size: 14px;
    font-weight: 600; cursor: pointer; transition: background 0.2s;
  }
  .nav-cta:hover { background: var(--accent-hover); }

  /* ===== HERO ===== */
  .hero {
    padding: 140px 24px 100px;
    text-align: center;
    background: var(--bg);
    overflow: hidden;
  }
  .hero-badge {
    display: inline-flex; align-items: center; gap: 6px;
    background: var(--bg-secondary); border: 1px solid var(--border);
    padding: 6px 16px; border-radius: 980px;
    font-size: 13px; color: var(--text-secondary);
    margin-bottom: 28px;
  }
  .hero-badge .dot {
    width: 6px; height: 6px; border-radius: 50%; background: #30d158;
  }
  .hero h1 {
    font-size: 64px; font-weight: 700; letter-spacing: -0.03em;
    line-height: 1.08; margin-bottom: 24px;
    background: linear-gradient(135deg, #1d1d1f 0%, #6e6e73 100%);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    background-clip: text;
  }
  .hero p {
    font-size: 21px; color: var(--text-secondary);
    max-width: 640px; margin: 0 auto 44px; line-height: 1.5;
    font-weight: 400;
  }
  .hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
  .btn-primary {
    background: var(--accent); color: #fff; border: none;
    padding: 14px 32px; border-radius: 980px; font-size: 17px;
    font-weight: 600; cursor: pointer; transition: all 0.3s;
    display: inline-flex; align-items: center; gap: 8px;
  }
  .btn-primary:hover { background: var(--accent-hover); transform: scale(1.02); }
  .btn-secondary {
    background: transparent; color: var(--accent);
    border: 1.5px solid var(--accent);
    padding: 13px 32px; border-radius: 980px; font-size: 17px;
    font-weight: 600; cursor: pointer; transition: all 0.3s;
  }
  .btn-secondary:hover { background: rgba(0,113,227,0.06); }

  /* ===== HERO VISUAL ===== */
  .hero-visual {
    margin-top: 64px;
    background: var(--bg-secondary);
    border-radius: var(--radius); overflow: hidden;
    border: 1px solid rgba(0,0,0,0.04);
    box-shadow: var(--shadow-lg);
    max-width: 1000px; margin-left: auto; margin-right: auto;
  }
  .hero-mockup {
    padding: 32px; display: flex; gap: 16px; flex-wrap: wrap; justify-content: center;
  }
  .mockup-card {
    background: #fff; border-radius: var(--radius-sm); padding: 24px;
    flex: 1; min-width: 200px; max-width: 280px;
    border: 1px solid rgba(0,0,0,0.04);
    box-shadow: var(--shadow-sm);
    transition: transform 0.3s, box-shadow 0.3s;
  }
  .mockup-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
  .mockup-icon {
    width: 48px; height: 48px; border-radius: 12px;
    display: flex; align-items: center; justify-content: center;
    font-size: 24px; margin-bottom: 16px;
  }
  .mockup-card h3 { font-size: 15px; font-weight: 600; margin-bottom: 6px; }
  .mockup-card p { font-size: 13px; color: var(--text-tertiary); line-height: 1.4; }
  .icon-translate { background: #e8f4fd; }
  .icon-notes { background: #fef3e2; }
  .icon-dict { background: #e8fce8; }
  .icon-pen { background: #f0e8fd; }

  /* ===== STATS BAR ===== */
  .stats-bar {
    background: var(--bg-secondary);
    padding: 48px 24px;
    border-top: 1px solid rgba(0,0,0,0.04);
    border-bottom: 1px solid rgba(0,0,0,0.04);
  }
  .stats-grid {
    max-width: var(--max-w); margin: 0 auto;
    display: grid; grid-template-columns: repeat(4, 1fr); gap: 32px;
    text-align: center;
  }
  .stat-num {
    font-size: 40px; font-weight: 700; color: var(--text-primary);
    letter-spacing: -0.02em;
  }
  .stat-label { font-size: 14px; color: var(--text-tertiary); margin-top: 4px; }

  /* ===== PRODUCTS SECTION ===== */
  .section {
    padding: 100px 24px;
    max-width: var(--max-w); margin: 0 auto;
  }
  .section-header { text-align: center; margin-bottom: 64px; }
  .section-tag {
    font-size: 14px; font-weight: 600; color: var(--accent);
    text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 12px;
  }
  .section-title {
    font-size: 48px; font-weight: 700; letter-spacing: -0.025em;
    line-height: 1.1; margin-bottom: 16px;
  }
  .section-desc {
    font-size: 19px; color: var(--text-secondary); max-width: 560px; margin: 0 auto;
  }

  /* Product Cards */
  .products-grid {
    display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px;
  }
  .product-card {
    background: var(--bg);
    border: 1px solid rgba(0,0,0,0.06);
    border-radius: var(--radius); padding: 32px 24px; text-align: center;
    transition: all 0.3s; cursor: pointer; position: relative; overflow: hidden;
  }
  .product-card::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; height: 4px;
    border-radius: var(--radius) var(--radius) 0 0;
  }
  .product-card:nth-child(1)::before { background: linear-gradient(90deg, #0071e3, #00c6ff); }
  .product-card:nth-child(2)::before { background: linear-gradient(90deg, #ff9500, #ffcc00); }
  .product-card:nth-child(3)::before { background: linear-gradient(90deg, #af52de, #ff6482); }
  .product-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
  }
  .product-icon {
    width: 56px; height: 56px; border-radius: 16px;
    display: flex; align-items: center; justify-content: center;
    font-size: 28px; margin-bottom: 20px;
  }
  .product-card h3 {
    font-size: 22px; font-weight: 600; margin-bottom: 8px;
    letter-spacing: -0.01em;
  }
  .product-card .desc {
    font-size: 14px; color: var(--text-tertiary); line-height: 1.5;
    margin-bottom: 16px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
  }
  .product-card .meta {
    display: flex; align-items: center; gap: 12px;
    font-size: 13px; color: var(--text-tertiary); justify-content: center;
  }
  .product-card .meta .version {
    background: var(--bg-secondary); padding: 4px 10px;
    border-radius: 980px; font-weight: 500;
  }
  .product-card .link {
    color: var(--accent); font-weight: 500; text-decoration: none;
    display: inline-flex; align-items: center; gap: 4px;
    font-size: 15px; margin-top: 16px; justify-content: center;
  }
  .product-card .link svg { width: 16px; height: 16px; transition: transform 0.2s; }
  .product-card:hover .link svg { transform: translateX(3px); }

  /* ===== DOWNLOAD SECTION ===== */
  .download-section {
    background: var(--bg-secondary);
    padding: 100px 24px;
  }
  .download-grid {
    max-width: var(--max-w); margin: 0 auto;
    display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
  }
  .dl-card {
    background: #fff; border-radius: var(--radius); padding: 40px 32px;
    text-align: center; border: 1px solid rgba(0,0,0,0.04);
    transition: all 0.3s;
  }
  .dl-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-4px); }
  .dl-icon {
    width: 64px; height: 64px; border-radius: 16px; margin: 0 auto 20px;
    display: flex; align-items: center; justify-content: center;
    font-size: 32px;
  }
  .dl-card h3 { font-size: 20px; font-weight: 600; margin-bottom: 8px; }
  .dl-card .sys { font-size: 14px; color: var(--text-tertiary); margin-bottom: 24px; }
  .dl-btn {
    display: inline-block; width: 100%;
    background: var(--accent); color: #fff;
    padding: 14px 0; border-radius: 12px;
    font-size: 16px; font-weight: 600;
    text-decoration: none; transition: all 0.2s;
    border: none; cursor: pointer;
  }
  .dl-btn:hover { background: var(--accent-hover); }
  .dl-info {
    font-size: 12px; color: var(--text-tertiary); margin-top: 12px;
  }

  /* ===== COMPARE SECTION ===== */
  .compare-grid {
    display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px;
  }
  .compare-card {
    background: var(--bg-tertiary); border: 1px solid rgba(0,0,0,0.04);
    border-radius: var(--radius); padding: 36px 28px;
    transition: all 0.3s; cursor: pointer;
  }
  .compare-card:hover { box-shadow: var(--shadow-md); border-color: rgba(0,0,0,0.08); }
  .compare-vs {
    font-size: 12px; font-weight: 600; color: var(--accent);
    text-transform: uppercase; letter-spacing: 0.1em; margin-bottom: 16px;
  }
  .compare-card h3 { font-size: 19px; font-weight: 600; margin-bottom: 10px; }
  .compare-card p { font-size: 14px; color: var(--text-secondary); line-height: 1.5; }

  /* ===== GUIDES SECTION ===== */
  .guides-grid {
    display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px;
  }
  .guide-card {
    display: flex; flex-direction: column; gap: 10px;
    background: var(--bg-tertiary); border: 1px solid rgba(0,0,0,0.04);
    border-radius: var(--radius); padding: 28px;
    transition: all 0.3s; cursor: pointer; text-decoration: none; color: inherit;
  }
  .guide-card:hover { box-shadow: var(--shadow-md); border-color: rgba(0,0,0,0.08); }
  .guide-thumb {
    width: 44px; height: 44px; border-radius: 12px;
    display: flex; align-items: center; justify-content: center;
    font-size: 22px; margin: 0 auto;
  }
  .guide-card h3 { font-size: 16px; font-weight: 600; margin-bottom: 6px; }
  .guide-card p { font-size: 14px; color: var(--text-secondary); line-height: 1.5; }
  .guide-tag {
    display: inline-block; font-size: 11px; font-weight: 600;
    padding: 3px 8px; border-radius: 6px; margin-top: 10px;
  }
  .tag-tutorial { background: #e8f4fd; color: #0071e3; }
  .tag-compare { background: #f0e8fd; color: #af52de; }
  .tag-feature { background: #e8fce8; color: #30a14e; }

  /* ===== FOOTER ===== */
  footer {
    background: var(--bg-secondary);
    border-top: 1px solid rgba(0,0,0,0.04);
    padding: 48px 24px 32px;
  }
  .footer-inner {
    max-width: var(--max-w); margin: 0 auto;
    display: flex; justify-content: space-between; align-items: start;
  }
  .footer-brand { max-width: 300px; }
  .footer-brand p { font-size: 13px; color: var(--text-tertiary); margin-top: 8px; line-height: 1.5; }
  .footer-links { display: flex; gap: 64px; }
  .footer-col h4 { font-size: 13px; font-weight: 600; color: var(--text-primary); margin-bottom: 12px; }
  .footer-col a {
    display: block; font-size: 13px; color: var(--text-tertiary);
    text-decoration: none; margin-bottom: 8px; transition: color 0.2s;
  }
  .footer-col a:hover { color: var(--text-primary); }
  .footer-bottom {
    max-width: var(--max-w); margin: 32px auto 0;
    padding-top: 24px; border-top: 1px solid rgba(0,0,0,0.06);
    font-size: 12px; color: var(--text-tertiary); text-align: center;
  }

  /* ===== RESPONSIVE ===== */
  @media (max-width: 768px) {
    .hero h1 { font-size: 36px; }
    .hero p { font-size: 17px; }
    .section-title { font-size: 32px; }
    .products-grid, .download-grid, .compare-grid { grid-template-columns: 1fr; }
    .guides-grid { grid-template-columns: repeat(2, 1fr); }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .nav-links { display: none; }
    .footer-links { flex-direction: column; gap: 32px; }
  }

/* ===== ARTICLE PAGE STYLES ===== */

/* Breadcrumb */
.breadcrumb-bar{max-width:var(--max-w-wide);margin:0 auto;padding:72px 24px 0}
.breadcrumb{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--text-tertiary)}
.breadcrumb a{color:var(--text-secondary);text-decoration:none}
.breadcrumb a:hover{color:var(--accent)}
.breadcrumb .sep{opacity:.4}
.breadcrumb .current{color:var(--text-tertiary)}

/* Article Header */
.article-header{max-width:var(--max-w);margin:0 auto;padding:32px 24px 0}
.article-tag{display:inline-flex;align-items:center;gap:6px;background:var(--bg-secondary);border:1px solid var(--border);padding:5px 14px;border-radius:980px;font-size:13px;color:var(--text-secondary);margin-bottom:20px;font-weight:500}
.article-header h1{font-size:40px;font-weight:700;letter-spacing:-.025em;line-height:1.15;margin-bottom:16px;color:var(--text-primary)}
.article-meta{display:flex;align-items:center;gap:20px;padding-bottom:28px;border-bottom:1px solid rgba(0,0,0,.06);flex-wrap:wrap}
.meta-item{display:flex;align-items:center;gap:6px;font-size:14px;color:var(--text-tertiary)}
.meta-avatar{width:32px;height:32px;border-radius:50%;background:linear-gradient(135deg,#667eea,#764ba2);display:flex;align-items:center;justify-content:center;color:#fff;font-size:14px;font-weight:600}
.meta-author{font-weight:500;color:var(--text-secondary)}

/* Cover Image */
.cover-image{max-width:var(--max-w);margin:28px auto 0;padding:0 24px}
.cover-img{width:100%;aspect-ratio:16/9;border-radius:var(--radius);background:linear-gradient(135deg,#e8f4fd,#d1ecf9);display:flex;align-items:center;justify-content:center;overflow:hidden;position:relative;border:1px solid rgba(0,0,0,.04)}
.cover-img img{width:100%;height:100%;object-fit:cover}
.cover-badge{position:absolute;bottom:16px;right:16px;background:rgba(255,255,255,.9);backdrop-filter:blur(10px);padding:6px 14px;border-radius:10px;font-size:12px;font-weight:600;color:var(--text-secondary);border:1px solid rgba(0,0,0,.06)}

/* Download CTA Banner */
.dl-banner{max-width:var(--max-w);margin:40px auto 0;padding:0 24px}
.dl-banner-inner{background:linear-gradient(135deg,#0071e3,#00a8e8);border-radius:var(--radius);padding:28px 36px;display:flex;align-items:center;justify-content:space-between;gap:24px}
.dl-banner-text h3{font-size:20px;font-weight:700;color:#fff;margin-bottom:4px}
.dl-banner-text p{font-size:14px;color:rgba(255,255,255,.8)}
.dl-banner-btn{background:#fff;color:var(--accent);border:none;padding:14px 32px;border-radius:12px;font-size:16px;font-weight:700;cursor:pointer;transition:all .2s;white-space:nowrap;box-shadow:0 4px 16px rgba(0,0,0,.15);text-decoration:none;display:inline-block}
.dl-banner-btn:hover{transform:scale(1.03);color:var(--accent)}

/* Article Layout (two-column) */
.article-layout{max-width:var(--max-w-wide);margin:40px auto 0;padding:0 24px;display:grid;grid-template-columns:1fr 300px;gap:48px}
.article-body{min-width:0}

/* Article Body Content */
.article-body h2{font-size:28px;font-weight:700;letter-spacing:-.02em;line-height:1.2;margin:48px 0 20px;padding-top:24px;color:var(--text-primary)}
.article-body h3{font-size:22px;font-weight:600;margin:36px 0 14px;color:var(--text-primary)}
.article-body p{font-size:17px;line-height:1.8;color:var(--text-secondary);margin-bottom:20px}
.article-body strong{color:var(--text-primary);font-weight:600}
.article-body a{color:var(--accent);text-decoration:none}
.article-body a:hover{text-decoration:underline}
.article-body ul,.article-body ol{color:var(--text-secondary);margin-bottom:20px;padding-left:24px;font-size:17px;line-height:1.8}
.article-body li{margin-bottom:8px}

/* Inline Image */
.article-img{width:100%;border-radius:var(--radius-sm);margin:24px 0;background:var(--bg-secondary);aspect-ratio:16/9;display:flex;align-items:center;justify-content:center;font-size:40px;border:1px solid rgba(0,0,0,.04);overflow:hidden}
.article-img img{width:100%;height:auto}
.img-caption{text-align:center;font-size:13px;color:var(--text-tertiary);margin-top:-12px;margin-bottom:24px}

/* Callout */
.callout{background:var(--bg-secondary);border-radius:var(--radius-sm);padding:24px 28px;margin:24px 0;border-left:4px solid var(--accent)}
.callout-title{font-size:15px;font-weight:700;color:var(--text-primary);margin-bottom:8px;display:flex;align-items:center;gap:8px}
.callout p{font-size:15px;margin-bottom:0}

/* Spec Table */
.spec-table{width:100%;border-collapse:collapse;margin:24px 0;font-size:15px}
.spec-table th{text-align:left;font-weight:600;color:var(--text-primary);padding:12px 16px;background:var(--bg-secondary);border-bottom:2px solid var(--border)}
.spec-table th:first-child{border-radius:var(--radius-sm) 0 0 0}
.spec-table th:last-child{border-radius:0 var(--radius-sm) 0 0}
.spec-table td{padding:12px 16px;border-bottom:1px solid rgba(0,0,0,.04);color:var(--text-secondary)}
.spec-table tr:last-child td{border-bottom:none}
.spec-table .check{color:#30d158;font-weight:600}

/* Step List */
.step-list{margin:24px 0}
.step-item{display:flex;gap:20px;margin-bottom:28px}
.step-num{width:40px;height:40px;border-radius:50%;flex-shrink:0;background:var(--accent);color:#fff;display:flex;align-items:center;justify-content:center;font-size:17px;font-weight:700;margin-top:2px}
.step-content h4{font-size:17px;font-weight:600;margin-bottom:6px}
.step-content p{font-size:15px;margin-bottom:0}

/* Feature Grid */
.feature-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;margin:24px 0}
.feature-item{background:var(--bg-secondary);border-radius:var(--radius-sm);padding:20px 24px;transition:all .2s}
.feature-item:hover{background:var(--bg-tertiary);box-shadow:var(--shadow-sm)}
.feature-item .fi-icon{font-size:24px;margin-bottom:10px}
.feature-item h4{font-size:16px;font-weight:600;margin-bottom:6px}
.feature-item p{font-size:14px;color:var(--text-tertiary);margin-bottom:0}

/* FAQ Section */
.faq-section{margin-top:56px;padding-top:40px;border-top:1px solid rgba(0,0,0,.06)}
.faq-section h2{margin-top:0}
.faq-item{border:1px solid rgba(0,0,0,.06);border-radius:var(--radius-sm);margin-bottom:12px;overflow:hidden;transition:border-color .2s}
.faq-item:hover{border-color:rgba(0,0,0,.1)}
.faq-question{padding:20px 24px;cursor:pointer;display:flex;align-items:center;justify-content:space-between;font-size:16px;font-weight:600;color:var(--text-primary);background:var(--bg-tertiary);border:none;text-align:left;font-family:inherit;width:100%}
.faq-question svg{width:20px;height:20px;color:var(--text-tertiary);transition:transform .2s;flex-shrink:0}
.faq-item.active .faq-question svg{transform:rotate(45deg)}
.faq-answer{padding:0 24px;max-height:0;overflow:hidden;transition:all .3s}
.faq-item.active .faq-answer{padding:0 24px 20px;max-height:500px}
.faq-answer p{font-size:15px;line-height:1.7}

/* Sidebar */
.sidebar{position:sticky;top:72px;align-self:start}
.sidebar-card{background:var(--bg-secondary);border:1px solid rgba(0,0,0,.04);border-radius:var(--radius-sm);padding:24px;margin-bottom:20px}
.sidebar-card h4{font-size:14px;font-weight:700;color:var(--text-primary);margin-bottom:16px;padding-bottom:12px;border-bottom:1px solid rgba(0,0,0,.06)}

/* TOC */
#TableOfContents{list-style:none;padding:0}
#TableOfContents ul{list-style:none;padding:0}
#TableOfContents li{margin-bottom:8px}
#TableOfContents a{font-size:14px;color:var(--text-secondary);text-decoration:none;transition:color .2s;display:block;padding:4px 0}
#TableOfContents a:hover,#TableOfContents a.active{color:var(--accent)}
#TableOfContents a.active{font-weight:600}

/* Sidebar Download */
.sidebar-btn{display:block;width:100%;background:var(--accent);color:#fff;padding:14px 0;border-radius:12px;font-size:16px;font-weight:700;text-align:center;text-decoration:none;border:none;cursor:pointer;transition:background .2s;margin-top:12px}
.sidebar-btn:hover{background:var(--accent-hover);color:#fff}
.sidebar-info{font-size:13px;color:var(--text-tertiary);text-align:center;margin-top:10px}

/* Related List */
.related-list{list-style:none;padding:0}
.related-list li{padding:14px 0;border-bottom:1px solid rgba(0,0,0,.04)}
.related-list li:last-child{border-bottom:none}
.related-list a{font-size:14px;color:var(--text-primary);text-decoration:none;font-weight:500;transition:color .2s;line-height:1.4;display:block}
.related-list a:hover{color:var(--accent)}
.r-tag{font-size:11px;font-weight:600;color:var(--accent);background:rgba(0,113,227,.08);padding:2px 8px;border-radius:6px;margin-right:6px}

/* Responsive */
@media(max-width:900px){
  .article-layout{grid-template-columns:1fr}
  .sidebar{position:static}
  .feature-grid{grid-template-columns:1fr}
  .dl-banner-inner{flex-direction:column;text-align:center}
  .article-header h1{font-size:30px}
}