:root {
  --green-900: #054D44;
  --green-800: #075E54;
  --green-700: #0A7B6F;
  --green-600: #128C7E;
  --green-500: #25D366;
  --green-400: #4ADE80;
  --green-300: #86EFAC;
  --green-200: #BBF7D0;
  --green-100: #DCFCE7;
  --green-50: #F0FDF4;
  --navy-900: #0F172A;
  --navy-800: #1B2A4A;
  --navy-700: #2D3E63;
  --navy-600: #415A80;
  --navy-500: #5A6C8A;
  --navy-400: #8896AB;
  --navy-300: #B0BBCA;
  --navy-200: #D5DCE5;
  --navy-100: #E8ECF1;
  --navy-50: #F5F7FA;
  --white: #FFFFFF;
  --bg: #FAFBFC;
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, .06);
  --shadow-md: 0 4px 16px rgba(15, 23, 42, .08);
  --shadow-lg: 0 12px 40px rgba(15, 23, 42, .1);
  --shadow-xl: 0 20px 60px rgba(15, 23, 42, .12);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --transition: .3s cubic-bezier(.4, 0, .2, 1);
}

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

html { scroll-behavior: smooth; font-size: 16px; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }

body { font-family: var(--font); color: var(--navy-800); background: var(--bg); line-height: 1.7; overflow-x: hidden; }

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

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

ul, ol { list-style: none; }

button { border: none; cursor: pointer; font-family: inherit; }

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

.section { padding: 100px 0; }

.section-label { display: inline-flex; align-items: center; gap: 8px; font-size: 13px; font-weight: 600; color: var(--green-600); text-transform: uppercase; letter-spacing: 1.5px; margin-bottom: 16px; }
.section-label::before { content: ''; width: 24px; height: 2px; background: var(--green-500); border-radius: 1px; }

.section-title { font-size: clamp(28px, 4vw, 40px); font-weight: 800; line-height: 1.25; color: var(--navy-900); margin-bottom: 16px; letter-spacing: -.02em; }

.section-desc { font-size: 17px; color: var(--navy-500); max-width: 640px; line-height: 1.8; }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 14px 32px; font-size: 15px; font-weight: 600; border-radius: var(--radius-sm); transition: all var(--transition); white-space: nowrap; }
.btn-primary { background: var(--green-500); color: var(--white); box-shadow: 0 4px 14px rgba(37, 211, 102, .35); }
.btn-primary:hover { background: var(--green-400); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(37, 211, 102, .4); }
.btn-secondary { background: var(--white); color: var(--navy-800); border: 1.5px solid var(--navy-200); }
.btn-secondary:hover { border-color: var(--green-500); color: var(--green-800); background: var(--green-50); }
.btn-outline { background: transparent; color: var(--white); border: 1.5px solid rgba(255,255,255,.35); }
.btn-outline:hover { background: rgba(255,255,255,.1); border-color: rgba(255,255,255,.6); }
.btn-sm { padding: 10px 20px; font-size: 14px; }
.btn-lg { padding: 18px 40px; font-size: 16px; }
.btn svg { width: 18px; height: 18px; }

/* ===================== NAVIGATION ===================== */
.nav { position: fixed; top: 0; left: 0; right: 0; z-index: 1000; background: rgba(255,255,255,.85); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px); border-bottom: 1px solid transparent; transition: all var(--transition); }
.nav.scrolled { border-bottom-color: var(--navy-100); box-shadow: var(--shadow-sm); }
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 72px; }
.nav-logo { display: flex; align-items: center; gap: 10px; font-size: 22px; font-weight: 800; color: var(--green-800); letter-spacing: -.02em; }
.nav-logo svg { width: 36px; height: 36px; }
.nav-links { display: flex; align-items: center; gap: 36px; }
.nav-links a { font-size: 15px; font-weight: 500; color: var(--navy-600); position: relative; padding: 4px 0; }
.nav-links a:hover, .nav-links a.active { color: var(--green-800); }
.nav-links a::after { content: ''; position: absolute; bottom: -2px; left: 0; width: 0; height: 2px; background: var(--green-500); border-radius: 1px; transition: width var(--transition); }
.nav-links a:hover::after, .nav-links a.active::after { width: 100%; }
.nav-actions { display: flex; align-items: center; gap: 12px; }
.nav-toggle { display: none; width: 44px; height: 44px; align-items: center; justify-content: center; background: none; border-radius: var(--radius-sm); }
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--navy-800); position: relative; transition: all var(--transition); }
.nav-toggle span::before, .nav-toggle span::after { content: ''; position: absolute; left: 0; width: 100%; height: 2px; background: var(--navy-800); transition: all var(--transition); }
.nav-toggle span::before { top: -7px; }
.nav-toggle span::after { top: 7px; }
.nav-toggle.active span { background: transparent; }
.nav-toggle.active span::before { top: 0; transform: rotate(45deg); }
.nav-toggle.active span::after { top: 0; transform: rotate(-45deg); }

/* ===================== HERO ===================== */
.hero { padding: 140px 0 80px; background: linear-gradient(165deg, var(--green-900) 0%, var(--green-800) 30%, var(--green-700) 60%, var(--green-600) 100%); position: relative; overflow: hidden; }
.hero::before { content: ''; position: absolute; top: -40%; right: -20%; width: 800px; height: 800px; background: radial-gradient(circle, rgba(37,211,102,.15) 0%, transparent 70%); pointer-events: none; }
.hero::after { content: ''; position: absolute; bottom: -20%; left: -10%; width: 600px; height: 600px; background: radial-gradient(circle, rgba(37,211,102,.1) 0%, transparent 70%); pointer-events: none; }
.hero-content { position: relative; z-index: 2; text-align: center; max-width: 800px; margin: 0 auto; }
.hero-badge { display: inline-flex; align-items: center; gap: 8px; background: rgba(255,255,255,.12); border: 1px solid rgba(255,255,255,.18); padding: 8px 18px; border-radius: 100px; font-size: 13px; font-weight: 500; color: rgba(255,255,255,.9); margin-bottom: 32px; backdrop-filter: blur(10px); }
.hero-badge svg { width: 16px; height: 16px; }
.hero h1 { font-size: clamp(36px, 5.5vw, 60px); font-weight: 800; color: var(--white); line-height: 1.15; letter-spacing: -.03em; margin-bottom: 20px; }
.hero h1 span { background: linear-gradient(135deg, var(--green-300), var(--green-200)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero-desc { font-size: 18px; color: rgba(255,255,255,.75); line-height: 1.8; max-width: 600px; margin: 0 auto 40px; }
.hero-buttons { display: flex; align-items: center; justify-content: center; gap: 16px; margin-bottom: 60px; }
.hero-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: rgba(255,255,255,.1); border-radius: var(--radius-lg); overflow: hidden; max-width: 720px; margin: 0 auto; }
.hero-stat { background: rgba(255,255,255,.06); backdrop-filter: blur(10px); padding: 28px 20px; text-align: center; }
.hero-stat-value { font-size: 28px; font-weight: 800; color: var(--white); line-height: 1.2; margin-bottom: 6px; }
.hero-stat-label { font-size: 13px; color: rgba(255,255,255,.6); font-weight: 500; }

/* ===================== FEATURES OVERVIEW ===================== */
.features { background: var(--white); }
.features-header { text-align: center; margin-bottom: 60px; }
.features-header .section-desc { margin: 0 auto; }
.features-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.feature-card { padding: 36px 28px; border-radius: var(--radius-md); border: 1px solid var(--navy-100); background: var(--white); transition: all var(--transition); }
.feature-card:hover { border-color: var(--green-200); box-shadow: var(--shadow-md); transform: translateY(-4px); }
.feature-icon { width: 56px; height: 56px; border-radius: var(--radius-sm); display: flex; align-items: center; justify-content: center; margin-bottom: 20px; background: var(--green-50); color: var(--green-600); }
.feature-icon svg { width: 28px; height: 28px; }
.feature-card h3 { font-size: 18px; font-weight: 700; color: var(--navy-900); margin-bottom: 10px; }
.feature-card p { font-size: 14px; color: var(--navy-500); line-height: 1.7; }

/* ===================== FEATURE DETAIL ===================== */
.feature-detail { position: relative; }
.feature-detail:nth-child(even) { background: var(--navy-50); }
.detail-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: center; }
.detail-grid.reverse { direction: rtl; }
.detail-grid.reverse > * { direction: ltr; }
.detail-info { }
.detail-info h2 { font-size: clamp(24px, 3.5vw, 36px); font-weight: 800; color: var(--navy-900); line-height: 1.25; margin-bottom: 16px; letter-spacing: -.02em; }
.detail-info > p { font-size: 16px; color: var(--navy-500); margin-bottom: 32px; line-height: 1.8; }
.detail-list { display: flex; flex-direction: column; gap: 20px; }
.detail-item { display: flex; gap: 16px; }
.detail-item-icon { flex-shrink: 0; width: 44px; height: 44px; border-radius: 10px; background: var(--green-50); color: var(--green-600); display: flex; align-items: center; justify-content: center; }
.detail-item-icon svg { width: 22px; height: 22px; }
.detail-item h4 { font-size: 15px; font-weight: 700; color: var(--navy-900); margin-bottom: 4px; }
.detail-item p { font-size: 14px; color: var(--navy-500); line-height: 1.65; }
.detail-visual { border-radius: var(--radius-lg); overflow: hidden; background: linear-gradient(135deg, var(--green-50), var(--navy-50)); aspect-ratio: 4/3; display: flex; align-items: center; justify-content: center; position: relative; }
.detail-visual-placeholder { width: 85%; height: 80%; border-radius: var(--radius-md); background: var(--white); box-shadow: var(--shadow-lg); display: flex; flex-direction: column; overflow: hidden; }
.detail-visual-bar { height: 36px; background: var(--navy-50); border-bottom: 1px solid var(--navy-100); display: flex; align-items: center; gap: 6px; padding: 0 14px; }
.detail-visual-dot { width: 10px; height: 10px; border-radius: 50%; }
.detail-visual-dot:nth-child(1) { background: #FF6B6B; }
.detail-visual-dot:nth-child(2) { background: #FFD93D; }
.detail-visual-dot:nth-child(3) { background: #6BCB77; }
.detail-visual-body { flex: 1; padding: 20px; display: flex; gap: 16px; }
.detail-visual-sidebar { width: 30%; display: flex; flex-direction: column; gap: 10px; }
.detail-visual-contact { height: 40px; border-radius: 8px; background: var(--navy-50); }
.detail-visual-contact.active { background: var(--green-100); border: 1px solid var(--green-200); }
.detail-visual-chat { flex: 1; display: flex; flex-direction: column; justify-content: flex-end; gap: 8px; }
.detail-visual-msg { padding: 8px 14px; border-radius: 12px; font-size: 11px; max-width: 75%; }
.detail-visual-msg.received { background: var(--white); border: 1px solid var(--navy-100); align-self: flex-start; color: var(--navy-600); }
.detail-visual-msg.sent { background: var(--green-100); color: var(--green-800); align-self: flex-end; }

/* ===================== SECURITY ===================== */
.security { background: var(--navy-900); color: var(--white); overflow: hidden; position: relative; }
.security::before { content: ''; position: absolute; top: -50%; right: -20%; width: 600px; height: 600px; background: radial-gradient(circle, rgba(37,211,102,.08) 0%, transparent 70%); }
.security-header { text-align: center; margin-bottom: 56px; }
.security .section-title { color: var(--white); }
.security .section-desc { color: var(--navy-400); margin: 0 auto; }
.security-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; position: relative; z-index: 2; }
.security-card { padding: 36px 28px; border-radius: var(--radius-md); background: rgba(255,255,255,.04); border: 1px solid rgba(255,255,255,.08); transition: all var(--transition); }
.security-card:hover { background: rgba(255,255,255,.07); border-color: rgba(37,211,102,.3); }
.security-card-icon { width: 48px; height: 48px; border-radius: 10px; background: rgba(37,211,102,.12); color: var(--green-400); display: flex; align-items: center; justify-content: center; margin-bottom: 20px; }
.security-card-icon svg { width: 24px; height: 24px; }
.security-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 10px; }
.security-card p { font-size: 14px; color: var(--navy-400); line-height: 1.7; }

/* ===================== ARTICLES ===================== */
.articles { background: var(--white); }
.articles-header { display: flex; align-items: flex-end; justify-content: space-between; margin-bottom: 48px; }
.articles-more { font-size: 15px; font-weight: 600; color: var(--green-600); display: flex; align-items: center; gap: 6px; }
.articles-more:hover { color: var(--green-800); }
.articles-more svg { width: 18px; height: 18px; transition: transform var(--transition); }
.articles-more:hover svg { transform: translateX(4px); }
.articles-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.article-card { border-radius: var(--radius-md); border: 1px solid var(--navy-100); overflow: hidden; background: var(--white); transition: all var(--transition); display: flex; flex-direction: column; }
.article-card:hover { box-shadow: var(--shadow-md); transform: translateY(-4px); border-color: var(--green-200); }
.article-thumb { aspect-ratio: 16/9; background: linear-gradient(135deg, var(--green-100), var(--green-50)); display: flex; align-items: center; justify-content: center; overflow: hidden; position: relative; }
.article-thumb-icon { width: 56px; height: 56px; border-radius: 50%; background: var(--white); color: var(--green-600); display: flex; align-items: center; justify-content: center; box-shadow: var(--shadow-sm); }
.article-thumb-icon svg { width: 28px; height: 28px; }
.article-tag { position: absolute; top: 12px; left: 12px; padding: 4px 12px; background: var(--white); border-radius: 100px; font-size: 12px; font-weight: 600; color: var(--green-700); }
.article-body { padding: 24px; flex: 1; display: flex; flex-direction: column; }
.article-body h3 { font-size: 17px; font-weight: 700; color: var(--navy-900); line-height: 1.45; margin-bottom: 10px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.article-body h3:hover { color: var(--green-700); }
.article-body p { font-size: 14px; color: var(--navy-500); line-height: 1.7; flex: 1; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; margin-bottom: 16px; }
.article-meta { display: flex; align-items: center; justify-content: space-between; font-size: 13px; color: var(--navy-400); border-top: 1px solid var(--navy-100); padding-top: 16px; }
.article-meta span { display: flex; align-items: center; gap: 4px; }
.article-meta svg { width: 14px; height: 14px; }

/* ===================== PRICING ===================== */
.pricing { background: var(--navy-50); }
.pricing-header { text-align: center; margin-bottom: 56px; }
.pricing-header .section-desc { margin: 0 auto; }
.pricing-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; max-width: 800px; margin: 0 auto; }
.pricing-card { padding: 40px 36px; border-radius: var(--radius-lg); background: var(--white); border: 2px solid var(--navy-100); transition: all var(--transition); }
.pricing-card.popular { border-color: var(--green-500); position: relative; }
.pricing-card.popular::before { content: '推荐'; position: absolute; top: -14px; left: 50%; transform: translateX(-50%); background: var(--green-500); color: var(--white); padding: 4px 20px; border-radius: 100px; font-size: 13px; font-weight: 600; }
.pricing-card:hover { box-shadow: var(--shadow-lg); }
.pricing-name { font-size: 20px; font-weight: 700; color: var(--navy-900); margin-bottom: 8px; }
.pricing-desc { font-size: 14px; color: var(--navy-500); margin-bottom: 24px; }
.pricing-price { margin-bottom: 28px; }
.pricing-amount { font-size: 44px; font-weight: 800; color: var(--navy-900); }
.pricing-period { font-size: 15px; color: var(--navy-500); }
.pricing-features { display: flex; flex-direction: column; gap: 14px; margin-bottom: 32px; }
.pricing-feature { display: flex; align-items: center; gap: 10px; font-size: 14px; color: var(--navy-700); }
.pricing-feature svg { width: 18px; height: 18px; color: var(--green-500); flex-shrink: 0; }
.pricing-card .btn { width: 100%; }

/* ===================== FAQ ===================== */
.faq { background: var(--white); }
.faq-header { text-align: center; margin-bottom: 56px; }
.faq-header .section-desc { margin: 0 auto; }
.faq-list { max-width: 760px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
.faq-item { border: 1px solid var(--navy-100); border-radius: var(--radius-md); overflow: hidden; transition: all var(--transition); }
.faq-item.active { border-color: var(--green-200); box-shadow: var(--shadow-sm); }
.faq-question { display: flex; align-items: center; justify-content: space-between; padding: 20px 24px; cursor: pointer; font-size: 16px; font-weight: 600; color: var(--navy-900); background: none; width: 100%; text-align: left; }
.faq-question:hover { color: var(--green-700); }
.faq-question svg { width: 20px; height: 20px; color: var(--navy-400); transition: transform var(--transition); flex-shrink: 0; margin-left: 16px; }
.faq-item.active .faq-question svg { transform: rotate(180deg); color: var(--green-600); }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height .35s ease; }
.faq-answer-inner { padding: 0 24px 20px; font-size: 15px; color: var(--navy-500); line-height: 1.8; }

/* ===================== CTA BANNER ===================== */
.cta-banner { background: linear-gradient(135deg, var(--green-800), var(--green-600)); padding: 80px 0; text-align: center; position: relative; overflow: hidden; }
.cta-banner::before { content: ''; position: absolute; top: -50%; right: -30%; width: 500px; height: 500px; background: radial-gradient(circle, rgba(255,255,255,.08) 0%, transparent 70%); }
.cta-banner h2 { font-size: clamp(28px, 4vw, 40px); font-weight: 800; color: var(--white); margin-bottom: 16px; letter-spacing: -.02em; }
.cta-banner p { font-size: 17px; color: rgba(255,255,255,.75); margin-bottom: 36px; max-width: 500px; margin-left: auto; margin-right: auto; }
.cta-banner .btn-primary { background: var(--white); color: var(--green-800); box-shadow: 0 4px 20px rgba(0,0,0,.15); }
.cta-banner .btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(0,0,0,.2); }

/* ===================== FOOTER ===================== */
.footer { background: var(--navy-900); color: var(--navy-400); padding: 64px 0 0; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 48px; padding-bottom: 48px; border-bottom: 1px solid rgba(255,255,255,.08); }
.footer-brand p { font-size: 14px; line-height: 1.8; margin-top: 16px; max-width: 300px; }
.footer-logo { font-size: 22px; font-weight: 800; color: var(--white); display: flex; align-items: center; gap: 10px; }
.footer-logo svg { width: 32px; height: 32px; }
.footer-col h4 { font-size: 14px; font-weight: 700; color: var(--white); margin-bottom: 20px; text-transform: uppercase; letter-spacing: 1px; }
.footer-col a { display: block; font-size: 14px; padding: 5px 0; transition: color var(--transition); }
.footer-col a:hover { color: var(--green-400); }
.footer-bottom { display: flex; align-items: center; justify-content: space-between; padding: 24px 0; font-size: 13px; }
.footer-bottom a:hover { color: var(--green-400); }

/* ===================== BLOG PAGE ===================== */
.blog-hero { padding: 130px 0 60px; background: linear-gradient(165deg, var(--green-900), var(--green-700)); text-align: center; }
.blog-hero h1 { font-size: clamp(32px, 4.5vw, 48px); font-weight: 800; color: var(--white); margin-bottom: 12px; letter-spacing: -.02em; }
.blog-hero p { font-size: 17px; color: rgba(255,255,255,.7); max-width: 520px; margin: 0 auto; }
.blog-content { padding: 60px 0 100px; }
.blog-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.blog-tags { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; margin-bottom: 48px; }
.blog-tag { padding: 8px 20px; border-radius: 100px; font-size: 14px; font-weight: 500; border: 1px solid var(--navy-200); color: var(--navy-600); background: var(--white); transition: all var(--transition); cursor: pointer; }
.blog-tag:hover, .blog-tag.active { background: var(--green-50); border-color: var(--green-300); color: var(--green-700); }

/* ===================== ARTICLE PAGE ===================== */
.article-hero { padding: 130px 0 50px; background: linear-gradient(165deg, var(--green-900), var(--green-700)); }
.article-hero .container { max-width: 800px; }
.article-hero .article-tag { position: static; margin-bottom: 16px; display: inline-block; }
.article-hero h1 { font-size: clamp(28px, 4vw, 42px); font-weight: 800; color: var(--white); line-height: 1.3; margin-bottom: 20px; letter-spacing: -.02em; }
.article-hero-meta { display: flex; align-items: center; gap: 20px; font-size: 14px; color: rgba(255,255,255,.6); }
.article-hero-meta span { display: flex; align-items: center; gap: 6px; }
.article-hero-meta svg { width: 16px; height: 16px; }

.article-layout { display: grid; grid-template-columns: 1fr 280px; gap: 48px; max-width: 1100px; margin: 0 auto; padding: 48px 24px 100px; }
.article-main { min-width: 0; }
.article-content { background: var(--white); border-radius: var(--radius-md); padding: 48px; border: 1px solid var(--navy-100); }
.article-content h2 { font-size: 24px; font-weight: 700; color: var(--navy-900); margin: 40px 0 16px; padding-bottom: 12px; border-bottom: 2px solid var(--green-100); }
.article-content h2:first-child { margin-top: 0; }
.article-content h3 { font-size: 19px; font-weight: 700; color: var(--navy-900); margin: 28px 0 12px; }
.article-content p { font-size: 16px; color: var(--navy-700); line-height: 1.9; margin-bottom: 16px; }
.article-content ul, .article-content ol { margin: 12px 0 20px 20px; }
.article-content li { font-size: 15px; color: var(--navy-700); line-height: 1.8; margin-bottom: 8px; list-style: disc; }
.article-content ol li { list-style: decimal; }
.article-content strong { color: var(--navy-900); font-weight: 600; }
.article-content a { color: var(--green-600); font-weight: 500; border-bottom: 1px solid var(--green-200); }
.article-content a:hover { color: var(--green-800); border-bottom-color: var(--green-500); }
.article-content blockquote { border-left: 4px solid var(--green-500); background: var(--green-50); padding: 16px 20px; margin: 20px 0; border-radius: 0 var(--radius-sm) var(--radius-sm) 0; }
.article-content blockquote p { color: var(--green-800); margin: 0; font-size: 15px; }
.article-content .step-box { background: var(--navy-50); border: 1px solid var(--navy-100); border-radius: var(--radius-sm); padding: 20px 24px; margin: 16px 0; }
.article-content .step-box h4 { font-size: 16px; font-weight: 700; color: var(--green-800); margin-bottom: 8px; display: flex; align-items: center; gap: 8px; }
.article-content .step-num { display: inline-flex; align-items: center; justify-content: center; width: 28px; height: 28px; background: var(--green-500); color: var(--white); border-radius: 50%; font-size: 14px; font-weight: 700; }
.article-content .tip-box { background: #FFF8E1; border: 1px solid #FFE082; border-radius: var(--radius-sm); padding: 16px 20px; margin: 20px 0; }
.article-content .tip-box p { color: #7B6B00; margin: 0; font-size: 14px; }
.article-content .tip-box strong { color: #5D4E00; }
.article-content img { border-radius: var(--radius-sm); margin: 20px 0; box-shadow: var(--shadow-md); }
.article-content table { width: 100%; border-collapse: collapse; margin: 20px 0; font-size: 14px; }
.article-content th, .article-content td { padding: 12px 16px; text-align: left; border-bottom: 1px solid var(--navy-100); }
.article-content th { background: var(--navy-50); font-weight: 700; color: var(--navy-900); }
.article-content td { color: var(--navy-700); }

.article-sidebar { position: sticky; top: 96px; }
.sidebar-widget { background: var(--white); border: 1px solid var(--navy-100); border-radius: var(--radius-md); padding: 24px; margin-bottom: 20px; }
.sidebar-widget h3 { font-size: 15px; font-weight: 700; color: var(--navy-900); margin-bottom: 16px; padding-bottom: 12px; border-bottom: 2px solid var(--green-100); }
.toc-list { display: flex; flex-direction: column; gap: 2px; }
.toc-list a { display: block; font-size: 13px; color: var(--navy-500); padding: 6px 12px; border-radius: 6px; border-left: 2px solid transparent; transition: all var(--transition); }
.toc-list a:hover, .toc-list a.active { color: var(--green-700); background: var(--green-50); border-left-color: var(--green-500); }
.sidebar-cta { background: linear-gradient(135deg, var(--green-800), var(--green-600)); color: var(--white); border-radius: var(--radius-md); padding: 28px; text-align: center; }
.sidebar-cta h3 { font-size: 18px; font-weight: 700; margin-bottom: 10px; }
.sidebar-cta p { font-size: 13px; color: rgba(255,255,255,.75); margin-bottom: 20px; }
.sidebar-cta .btn { width: 100%; background: var(--white); color: var(--green-800); }
.sidebar-cta .btn:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }

.related-articles { padding: 60px 0 100px; background: var(--navy-50); }
.related-articles h2 { font-size: 28px; font-weight: 800; color: var(--navy-900); text-align: center; margin-bottom: 40px; }
.related-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }

/* ===================== BREADCRUMB ===================== */
.breadcrumb { display: flex; align-items: center; gap: 8px; font-size: 13px; color: rgba(255,255,255,.5); margin-bottom: 20px; flex-wrap: wrap; }
.breadcrumb a { color: rgba(255,255,255,.7); }
.breadcrumb a:hover { color: var(--white); }
.breadcrumb svg { width: 14px; height: 14px; }

/* ===================== SCROLL ANIMATIONS ===================== */
.fade-up { opacity: 0; transform: translateY(30px); transition: opacity .6s ease, transform .6s ease; }
.fade-up.visible { opacity: 1; transform: translateY(0); }
.fade-up-delay-1 { transition-delay: .1s; }
.fade-up-delay-2 { transition-delay: .2s; }
.fade-up-delay-3 { transition-delay: .3s; }

/* ===================== BACK TO TOP ===================== */
.back-to-top { position: fixed; bottom: 32px; right: 32px; width: 48px; height: 48px; border-radius: 50%; background: var(--green-500); color: var(--white); display: flex; align-items: center; justify-content: center; box-shadow: var(--shadow-md); opacity: 0; visibility: hidden; transform: translateY(10px); transition: all var(--transition); z-index: 999; }
.back-to-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover { background: var(--green-400); transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.back-to-top svg { width: 22px; height: 22px; }

/* ===================== RESPONSIVE ===================== */
@media (max-width: 1024px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .detail-grid { grid-template-columns: 1fr; gap: 40px; }
  .detail-grid.reverse { direction: ltr; }
  .detail-visual { max-width: 500px; margin: 0 auto; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 36px; }
}

@media (max-width: 768px) {
  .section { padding: 72px 0; }
  .nav-links { display: none; position: fixed; top: 72px; left: 0; right: 0; bottom: 0; background: var(--white); flex-direction: column; align-items: center; justify-content: center; gap: 28px; }
  .nav-links.open { display: flex; }
  .nav-toggle { display: flex; }
  .nav-actions .btn { display: none; }
  .hero { padding: 120px 0 60px; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
  .hero-buttons { flex-direction: column; align-items: stretch; }
  .features-grid { grid-template-columns: 1fr; }
  .security-grid { grid-template-columns: 1fr; }
  .articles-grid, .blog-grid, .related-grid { grid-template-columns: 1fr; }
  .articles-header { flex-direction: column; align-items: flex-start; gap: 16px; }
  .pricing-grid { grid-template-columns: 1fr; }
  .article-layout { grid-template-columns: 1fr; }
  .article-sidebar { position: static; }
  .article-content { padding: 28px 20px; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .hero h1 { font-size: 30px; }
  .hero-stat { padding: 20px 12px; }
  .hero-stat-value { font-size: 22px; }
}