/* ========== VARIABLES ========== */
:root {
  --indigo: #2D3561;
  --indigo-dark: #1E2446;
  --indigo-light: #3D4A7A;
  --coral: #FF6B6B;
  --coral-dark: #E85555;
  --coral-light: #FFF0F0;
  --teal: #00BFA5;
  --teal-dark: #009E8A;
  --teal-light: #E6FAF7;
  --gold: #FFB347;
  --bg: #FAFAF8;
  --white: #FFFFFF;
  --text: #1E1E2F;
  --muted: #6B7280;
  --border: #E5E7EB;
  --surface: #F3F4F6;
  --radius: 14px;
  --radius-sm: 8px;
  --shadow: 0 4px 24px rgba(45,53,97,.08);
  --shadow-lg: 0 12px 40px rgba(45,53,97,.12);
}

/* ========== RESET ========== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, 'Segoe UI', 'Microsoft YaHei', 'PingFang SC', sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
ul, ol { list-style: none; }
img { max-width: 100%; display: block; }

/* ========== ANIMATIONS ========== */
@keyframes spin { to { transform: rotate(360deg); } }
@keyframes fadeUp { from { opacity: 0; transform: translateY(24px); } to { opacity: 1; transform: none; } }
@keyframes float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }
@keyframes slideIn { from { opacity: 0; transform: translateX(-20px); } to { opacity: 1; transform: none; } }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: .6; } }
@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

/* ========== CONTAINER ========== */
.container { max-width: 1180px; margin: 0 auto; padding: 0 24px; }

/* ========== NAVBAR ========== */
.navbar {
  position: sticky; top: 0; z-index: 500;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow .3s;
}
.navbar.scrolled { box-shadow: 0 2px 20px rgba(0,0,0,.06); }
.nav-inner {
  max-width: 1180px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 24px; height: 68px;
}
.nav-brand {
  display: flex; align-items: center; gap: 10px;
  font-size: 1.15rem; font-weight: 800; color: var(--indigo);
}
.nav-brand svg { flex-shrink: 0; }
.nav-menu { display: flex; align-items: center; gap: 6px; }
.nav-menu a {
  padding: 8px 18px; border-radius: 24px;
  font-size: .88rem; font-weight: 600;
  color: var(--muted); transition: all .2s;
}
.nav-menu a:hover { color: var(--indigo); background: var(--surface); }
.nav-menu a.active { color: #fff; background: var(--indigo); }
.nav-cta {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 9px 20px; border-radius: 24px;
  background: var(--coral); color: #fff;
  font-size: .85rem; font-weight: 700;
  transition: background .2s, transform .15s;
}
.nav-cta:hover { background: var(--coral-dark); transform: translateY(-1px); }
.nav-hamburger {
  display: none; flex-direction: column; gap: 5px; padding: 4px;
}
.nav-hamburger span {
  width: 22px; height: 2px; background: var(--indigo); border-radius: 2px; transition: .3s;
}

/* ========== MOBILE NAV ========== */
@media (max-width: 768px) {
  .nav-menu, .nav-cta { display: none; }
  .nav-hamburger { display: flex; }
  .nav-menu.open {
    display: flex; flex-direction: column;
    position: absolute; top: 68px; left: 0; right: 0;
    background: #fff; padding: 16px 24px;
    border-bottom: 1px solid var(--border);
    box-shadow: 0 8px 24px rgba(0,0,0,.08);
    gap: 4px;
  }
  .nav-cta.show { display: inline-flex; margin: 8px 24px 16px; }
}

/* ========== HERO ========== */
.hero {
  background: linear-gradient(135deg, var(--indigo-dark) 0%, var(--indigo) 50%, var(--indigo-light) 100%);
  color: #fff; padding: 88px 24px 72px; position: relative; overflow: hidden;
}
.hero-deco {
  position: absolute; pointer-events: none;
}
.hero-deco-1 {
  width: 400px; height: 400px; border-radius: 50%;
  background: rgba(0,191,165,.08);
  top: -120px; right: -80px;
}
.hero-deco-2 {
  width: 260px; height: 260px; border-radius: 50%;
  background: rgba(255,107,107,.06);
  bottom: -80px; left: -60px;
}
.hero-grid {
  max-width: 1180px; margin: 0 auto;
  display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 16px; border-radius: 24px;
  background: rgba(255,255,255,.12); font-size: .8rem; font-weight: 600;
  margin-bottom: 20px;
}
.hero-badge-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--teal); animation: pulse 2s infinite;
}
.hero h1 {
  font-size: 2.8rem; font-weight: 900; line-height: 1.2; margin-bottom: 18px;
}
.hero h1 .hl {
  background: linear-gradient(90deg, var(--coral), var(--gold));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-desc {
  font-size: 1.05rem; line-height: 1.8; opacity: .85; margin-bottom: 28px; max-width: 480px;
}
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-stats {
  display: flex; gap: 32px; margin-top: 32px;
}
.hero-stat { text-align: center; }
.hero-stat-num { font-size: 1.6rem; font-weight: 800; color: var(--teal); }
.hero-stat-label { font-size: .75rem; opacity: .7; margin-top: 2px; }

/* Hero demo panel */
.hero-demo {
  background: rgba(255,255,255,.07);
  border: 1px solid rgba(255,255,255,.12);
  border-radius: var(--radius); padding: 28px;
  backdrop-filter: blur(8px);
  animation: float 6s ease-in-out infinite;
}
.demo-header {
  display: flex; align-items: center; gap: 8px; margin-bottom: 18px;
  font-size: .8rem; font-weight: 600; opacity: .7;
}
.demo-dots { display: flex; gap: 6px; }
.demo-dots span { width: 10px; height: 10px; border-radius: 50%; }
.demo-dots span:nth-child(1) { background: #FF6B6B; }
.demo-dots span:nth-child(2) { background: #FFB347; }
.demo-dots span:nth-child(3) { background: #00BFA5; }
.demo-input, .demo-output {
  background: rgba(255,255,255,.06); border-radius: var(--radius-sm);
  padding: 16px; margin-bottom: 12px;
}
.demo-lang {
  font-size: .7rem; text-transform: uppercase; letter-spacing: .08em;
  color: var(--teal); margin-bottom: 8px; font-weight: 700;
}
.demo-text { font-size: .95rem; line-height: 1.6; }
.demo-arrow {
  text-align: center; margin: 8px 0; opacity: .5;
}

/* ========== BUTTONS ========== */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 28px; border-radius: 28px;
  font-size: .92rem; font-weight: 700;
  transition: all .2s; border: none; cursor: pointer;
}
.btn svg { width: 18px; height: 18px; flex-shrink: 0; }
.btn-coral { background: var(--coral); color: #fff; }
.btn-coral:hover { background: var(--coral-dark); transform: translateY(-2px); box-shadow: 0 6px 20px rgba(255,107,107,.3); }
.btn-outline {
  background: transparent; color: #fff;
  border: 2px solid rgba(255,255,255,.3);
}
.btn-outline:hover { border-color: #fff; background: rgba(255,255,255,.1); }
.btn-teal { background: var(--teal); color: #fff; }
.btn-teal:hover { background: var(--teal-dark); transform: translateY(-2px); box-shadow: 0 6px 20px rgba(0,191,165,.3); }
.btn-indigo { background: var(--indigo); color: #fff; }
.btn-indigo:hover { background: var(--indigo-dark); transform: translateY(-2px); }
.btn-white { background: #fff; color: var(--indigo); }
.btn-white:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.btn-ghost {
  background: transparent; color: var(--indigo); border: 2px solid var(--border);
}
.btn-ghost:hover { border-color: var(--indigo); background: rgba(45,53,97,.04); }

/* ========== SECTIONS ========== */
.section { padding: 80px 24px; }
.section-dark { background: var(--indigo); color: #fff; }
.section-teal { background: linear-gradient(135deg, #00897B, #00BFA5); color: #fff; }
.section-surface { background: var(--surface); }
.section-header { text-align: center; margin-bottom: 52px; }
.section-header h2 { font-size: 2rem; font-weight: 800; margin-bottom: 12px; }
.section-header p { font-size: 1rem; color: var(--muted); max-width: 560px; margin: 0 auto; }
.section-dark .section-header p { color: rgba(255,255,255,.7); }
.section-tag {
  display: inline-block; padding: 4px 14px; border-radius: 20px;
  font-size: .72rem; font-weight: 700; text-transform: uppercase; letter-spacing: .1em;
  margin-bottom: 14px;
}
.tag-coral { background: var(--coral-light); color: var(--coral); }
.tag-teal { background: var(--teal-light); color: var(--teal-dark); }
.tag-indigo { background: rgba(45,53,97,.08); color: var(--indigo); }

/* ========== FEATURE MOSAIC ========== */
.mosaic {
  max-width: 1180px; margin: 0 auto;
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}
.mosaic-card {
  background: var(--white); border-radius: var(--radius);
  padding: 32px; border: 1px solid var(--border);
  transition: transform .25s, box-shadow .25s;
}
.mosaic-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.mosaic-card.span-2 { grid-column: span 2; }
.mosaic-icon {
  width: 52px; height: 52px; border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 18px;
}
.mosaic-icon svg { width: 26px; height: 26px; }
.icon-coral { background: var(--coral-light); color: var(--coral); }
.icon-teal { background: var(--teal-light); color: var(--teal); }
.icon-indigo { background: rgba(45,53,97,.08); color: var(--indigo); }
.icon-gold { background: #FFF3E0; color: #E8900C; }
.mosaic-card h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 8px; }
.mosaic-card p { font-size: .88rem; color: var(--muted); line-height: 1.7; }

/* ========== PLATFORM STRIP ========== */
.platform-strip {
  max-width: 1180px; margin: 0 auto;
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px;
}
.platform-card {
  background: var(--white); border-radius: var(--radius);
  padding: 28px; text-align: center;
  border: 1px solid var(--border); transition: all .25s;
}
.platform-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.platform-card.featured {
  background: var(--indigo); color: #fff; border-color: var(--indigo);
}
.platform-card.featured .platform-name { color: #fff; }
.platform-card.featured .platform-desc { color: rgba(255,255,255,.7); }
.platform-icon {
  width: 56px; height: 56px; border-radius: 16px;
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 16px;
}
.platform-icon svg { width: 28px; height: 28px; }
.platform-name { font-size: 1rem; font-weight: 700; margin-bottom: 6px; }
.platform-desc { font-size: .8rem; color: var(--muted); margin-bottom: 16px; }
.platform-card button, .platform-card .btn { width: 100%; justify-content: center; }

/* ========== REVIEW CARDS ========== */
.reviews-grid {
  max-width: 1180px; margin: 0 auto;
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}
.review-card {
  background: var(--white); border-radius: var(--radius);
  padding: 28px; border: 1px solid var(--border);
  position: relative;
}
.review-card::before {
  content: '\201C'; position: absolute; top: 16px; right: 24px;
  font-size: 3.5rem; color: var(--coral); opacity: .15; font-family: Georgia, serif; line-height: 1;
}
.review-stars { display: flex; gap: 3px; margin-bottom: 12px; }
.review-stars svg { width: 16px; height: 16px; color: var(--gold); }
.review-text { font-size: .88rem; color: var(--text); line-height: 1.7; margin-bottom: 16px; }
.review-author { display: flex; align-items: center; gap: 10px; }
.review-avatar {
  width: 36px; height: 36px; border-radius: 50%;
  background: linear-gradient(135deg, var(--indigo), var(--teal));
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-size: .75rem; font-weight: 700;
}
.review-name { font-size: .82rem; font-weight: 600; }
.review-role { font-size: .72rem; color: var(--muted); }

/* ========== FAQ ========== */
.faq-grid {
  max-width: 1180px; margin: 0 auto;
  display: grid; grid-template-columns: 1fr 1fr; gap: 16px;
}
.faq-item {
  background: var(--white); border-radius: var(--radius-sm);
  border: 1px solid var(--border); overflow: hidden;
  transition: box-shadow .2s;
}
.faq-item:hover { box-shadow: 0 2px 12px rgba(0,0,0,.04); }
.faq-q {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 22px; cursor: pointer; gap: 12px;
  font-size: .9rem; font-weight: 600; color: var(--text);
  user-select: none;
}
.faq-q svg { width: 18px; height: 18px; flex-shrink: 0; color: var(--muted); transition: transform .3s; }
.faq-item.open .faq-q svg { transform: rotate(180deg); }
.faq-a {
  max-height: 0; overflow: hidden;
  transition: max-height .35s ease, padding .35s;
}
.faq-item.open .faq-a { max-height: 400px; }
.faq-a-inner {
  padding: 0 22px 18px;
  font-size: .85rem; color: var(--muted); line-height: 1.75;
}

/* ========== FOOTER ========== */
.footer {
  background: var(--indigo-dark); color: rgba(255,255,255,.7);
  padding: 48px 24px 32px; text-align: center;
}
.footer-links { display: flex; justify-content: center; gap: 28px; margin-bottom: 20px; }
.footer-links a { font-size: .85rem; transition: color .2s; }
.footer-links a:hover { color: #fff; }
.footer-divider { width: 60px; height: 2px; background: rgba(255,255,255,.15); margin: 20px auto; border-radius: 2px; }
.footer-safe {
  font-size: .8rem; margin-bottom: 8px; display: flex; align-items: center; justify-content: center; gap: 6px;
}
.footer-safe svg { width: 16px; height: 16px; color: var(--teal); }
.footer-copy { font-size: .72rem; opacity: .5; line-height: 1.6; }

/* ========== DOWNLOAD PAGE ========== */
.dl-hero {
  background: linear-gradient(135deg, var(--indigo-dark), var(--indigo));
  color: #fff; padding: 72px 24px 56px; text-align: center;
}
.dl-hero h1 { font-size: 2.2rem; font-weight: 800; margin-bottom: 12px; }
.dl-hero p { opacity: .8; max-width: 500px; margin: 0 auto; }

.dl-main-card {
  max-width: 900px; margin: -40px auto 0;
  background: var(--white); border-radius: var(--radius);
  box-shadow: var(--shadow-lg); overflow: hidden;
  display: grid; grid-template-columns: 1fr 1fr;
}
.dl-main-left {
  background: linear-gradient(135deg, var(--indigo), var(--indigo-light));
  padding: 48px 40px; color: #fff;
  display: flex; flex-direction: column; justify-content: center;
}
.dl-main-left h2 { font-size: 1.6rem; font-weight: 800; margin-bottom: 12px; }
.dl-main-left p { opacity: .8; font-size: .9rem; margin-bottom: 24px; }
.dl-main-right { padding: 48px 40px; }
.dl-info-row {
  display: flex; justify-content: space-between; align-items: center;
  padding: 12px 0; border-bottom: 1px solid var(--border);
  font-size: .88rem;
}
.dl-info-row:last-child { border-bottom: none; }
.dl-info-label { color: var(--muted); }
.dl-info-value { font-weight: 600; }

/* ========== STEPS TIMELINE ========== */
.steps-wrap { max-width: 800px; margin: 0 auto; }
.step-item {
  display: flex; gap: 24px; position: relative; padding-bottom: 36px;
}
.step-item:last-child { padding-bottom: 0; }
.step-line {
  display: flex; flex-direction: column; align-items: center;
}
.step-num {
  width: 40px; height: 40px; border-radius: 50%;
  background: var(--indigo); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: .85rem; font-weight: 700; flex-shrink: 0;
  position: relative; z-index: 1;
}
.step-connector {
  width: 2px; flex: 1; background: var(--border); margin-top: 4px;
}
.step-item:last-child .step-connector { display: none; }
.step-content { padding-top: 8px; }
.step-content h4 { font-size: 1rem; font-weight: 700; margin-bottom: 6px; }
.step-content p { font-size: .85rem; color: var(--muted); }

/* ========== TABS ========== */
.tabs-bar {
  display: flex; gap: 4px; background: var(--surface); border-radius: 10px;
  padding: 4px; margin-bottom: 24px; width: fit-content;
}
.tab-btn {
  padding: 10px 22px; border-radius: 8px;
  font-size: .85rem; font-weight: 600; color: var(--muted);
  transition: all .2s;
}
.tab-btn.active { background: var(--white); color: var(--indigo); box-shadow: 0 2px 8px rgba(0,0,0,.06); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ========== SPEC TABLE ========== */
.spec-table {
  width: 100%; border-collapse: collapse;
  background: var(--white); border-radius: var(--radius); overflow: hidden;
  box-shadow: var(--shadow);
}
.spec-table th, .spec-table td {
  padding: 14px 20px; text-align: left; font-size: .85rem;
}
.spec-table th {
  background: var(--indigo); color: #fff; font-weight: 600;
}
.spec-table td { border-bottom: 1px solid var(--border); }
.spec-table tr:last-child td { border-bottom: none; }
.spec-table tr:hover td { background: rgba(45,53,97,.02); }

/* ========== SECURITY BANNER ========== */
.security-banner {
  background: var(--teal-light); border-radius: var(--radius);
  padding: 24px 32px; display: flex; align-items: center; gap: 16px;
  max-width: 1180px; margin: 0 auto;
}
.security-banner svg { width: 32px; height: 32px; color: var(--teal); flex-shrink: 0; }
.security-banner h4 { font-size: .95rem; font-weight: 700; margin-bottom: 4px; }
.security-banner p { font-size: .82rem; color: var(--muted); }

/* ========== ARTICLE PAGE ========== */
.article-hero {
  background: linear-gradient(135deg, var(--indigo-dark), var(--indigo));
  color: #fff; padding: 72px 24px 48px;
}
.article-hero .container { max-width: 800px; }
.breadcrumb { font-size: .8rem; opacity: .6; margin-bottom: 16px; }
.breadcrumb a:hover { opacity: 1; }
.article-hero h1 { font-size: 2.2rem; font-weight: 800; margin-bottom: 14px; }
.article-meta {
  display: flex; gap: 20px; font-size: .82rem; opacity: .7;
}
.article-meta span { display: flex; align-items: center; gap: 5px; }

.article-layout {
  max-width: 1180px; margin: 0 auto;
  display: grid; grid-template-columns: 1fr 280px; gap: 40px;
  padding: 48px 24px;
}
.article-body h2 {
  font-size: 1.45rem; font-weight: 800; margin: 40px 0 16px;
  padding-bottom: 10px; border-bottom: 2px solid var(--coral);
  display: inline-block;
}
.article-body h2:first-child { margin-top: 0; }
.article-body p { font-size: .92rem; color: var(--text); margin-bottom: 16px; line-height: 1.85; }
.article-body ul, .article-body ol {
  margin: 0 0 16px 20px; font-size: .92rem; color: var(--text);
}
.article-body li { margin-bottom: 8px; line-height: 1.7; }
.article-body ul li { list-style: disc; }
.article-body ol li { list-style: decimal; }

/* Sidebar */
.sidebar-sticky { position: sticky; top: 88px; }
.toc-card {
  background: var(--white); border-radius: var(--radius);
  border: 1px solid var(--border); padding: 24px; margin-bottom: 20px;
}
.toc-card h3 { font-size: .9rem; font-weight: 700; margin-bottom: 14px; }
.toc-list a {
  display: block; padding: 7px 12px; border-radius: 6px;
  font-size: .8rem; color: var(--muted); transition: all .15s;
  border-left: 2px solid transparent;
}
.toc-list a:hover, .toc-list a.active {
  color: var(--indigo); background: rgba(45,53,97,.04);
  border-left-color: var(--coral);
}
.sidebar-dl {
  background: linear-gradient(135deg, var(--indigo), var(--indigo-light));
  border-radius: var(--radius); padding: 24px; color: #fff; text-align: center;
}
.sidebar-dl h4 { font-size: .95rem; font-weight: 700; margin-bottom: 8px; }
.sidebar-dl p { font-size: .78rem; opacity: .7; margin-bottom: 16px; }
.sidebar-dl .btn { width: 100%; justify-content: center; font-size: .85rem; }

/* Comparison table in article */
.compare-table { width: 100%; border-collapse: collapse; margin: 16px 0 24px; }
.compare-table th, .compare-table td {
  padding: 12px 16px; text-align: left; font-size: .83rem; border-bottom: 1px solid var(--border);
}
.compare-table th { background: var(--surface); font-weight: 700; }
.compare-table td:first-child { font-weight: 600; }
.compare-table tr:hover td { background: rgba(45,53,97,.02); }

/* Tips grid */
.tips-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 14px;
  margin: 16px 0 24px;
}
.tip-card {
  background: var(--surface); border-radius: var(--radius-sm);
  padding: 18px; border-left: 3px solid var(--teal);
}
.tip-card h4 { font-size: .88rem; font-weight: 700; margin-bottom: 6px; }
.tip-card p { font-size: .82rem; color: var(--muted); }

/* Version log */
.version-log { margin: 16px 0 24px; }
.version-item {
  display: flex; gap: 16px; padding: 14px 0;
  border-bottom: 1px solid var(--border);
}
.version-item:last-child { border-bottom: none; }
.version-badge {
  padding: 4px 12px; border-radius: 6px; font-size: .75rem; font-weight: 700;
  background: var(--coral-light); color: var(--coral); white-space: nowrap;
  height: fit-content;
}
.version-info h4 { font-size: .88rem; font-weight: 600; margin-bottom: 4px; }
.version-info p { font-size: .8rem; color: var(--muted); }

/* CTA box */
.cta-box {
  background: linear-gradient(135deg, var(--coral), var(--coral-dark));
  border-radius: var(--radius); padding: 40px; text-align: center; color: #fff;
  margin: 40px 0;
}
.cta-box h3 { font-size: 1.4rem; font-weight: 800; margin-bottom: 10px; }
.cta-box p { opacity: .85; margin-bottom: 20px; max-width: 400px; margin-left: auto; margin-right: auto; }

/* ========== RESPONSIVE ========== */
@media (max-width: 1024px) {
  .mosaic { grid-template-columns: 1fr 1fr; }
  .mosaic-card.span-2 { grid-column: span 1; }
  .platform-strip { grid-template-columns: 1fr 1fr; }
  .article-layout { grid-template-columns: 1fr; }
  .sidebar-sticky { position: static; display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
}

@media (max-width: 768px) {
  .hero { padding: 64px 20px 48px; }
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .hero h1 { font-size: 2rem; }
  .hero-stats { gap: 20px; }
  .hero-demo { display: none; }
  .mosaic { grid-template-columns: 1fr; }
  .reviews-grid { grid-template-columns: 1fr; }
  .faq-grid { grid-template-columns: 1fr; }
  .platform-strip { grid-template-columns: 1fr; }
  .dl-main-card { grid-template-columns: 1fr; }
  .dl-main-left { padding: 32px 28px; }
  .dl-main-right { padding: 28px; }
  .section { padding: 56px 20px; }
  .section-header h2 { font-size: 1.6rem; }
  .security-banner { flex-direction: column; text-align: center; }
  .sidebar-sticky { grid-template-columns: 1fr; }
  .tips-grid { grid-template-columns: 1fr; }
  .article-hero h1 { font-size: 1.6rem; }
}