/* ═══════════════════════════════════════════
   Chrome Prism / Spectrum Light Theme
   White base + Chrome 4-color spectrum accents
   ═══════════════════════════════════════════ */

:root {
  --white: #ffffff;
  --gray-50: #f8f9fa;
  --gray-100: #f1f3f4;
  --gray-200: #e8eaed;
  --gray-300: #dadce0;
  --gray-500: #5f6368;
  --gray-700: #3c4043;
  --gray-900: #202124;
  --blue: #4285f4;
  --red: #ea4335;
  --yellow: #fbbc05;
  --green: #34a853;
  --spectrum: linear-gradient(135deg, var(--blue), var(--red), var(--yellow), var(--green));
  --spectrum-h: linear-gradient(90deg, var(--blue), var(--red), var(--yellow), var(--green));
  --shadow-sm: 0 1px 3px rgba(0,0,0,.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,.1);
  --shadow-lg: 0 8px 30px rgba(0,0,0,.12);
  --radius: 12px;
  --radius-sm: 8px;
  --max-w: 1200px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--gray-900);
  background: var(--white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }

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

@keyframes spin { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }
@keyframes fadeInUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
@keyframes prismShift { 0% { background-position: 0% 50%; } 50% { background-position: 100% 50%; } 100% { background-position: 0% 50%; } }
@keyframes float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }

/* ── Navigation ── */
.topnav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--gray-200);
}
.topnav::before {
  content: "";
  position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: var(--spectrum-h);
  background-size: 200% 100%;
  animation: prismShift 6s ease infinite;
}
.nav-inner {
  max-width: var(--max-w); margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 24px; height: 60px;
}
.brand {
  display: flex; align-items: center; gap: 10px;
  font-weight: 700; font-size: 18px; color: var(--gray-900);
}
.brand svg { flex-shrink: 0; }
.navlist { display: flex; gap: 4px; list-style: none; }
.navlist a {
  display: inline-block; padding: 8px 16px;
  font-size: 14px; font-weight: 500; color: var(--gray-500);
  border-radius: 20px; transition: all .2s;
}
.navlist a:hover { color: var(--gray-900); background: var(--gray-100); text-decoration: none; }
.navlist .on a { color: var(--blue); background: rgba(66,133,244,.1); }

/* ── Layout ── */
.wrap { max-width: var(--max-w); margin: 0 auto; padding: 0 24px; }
.sec { padding: 80px 0; }
.sec-alt { background: var(--gray-50); }
.sec-dark { background: var(--gray-900); color: var(--white); }
.sec-head { text-align: center; margin-bottom: 48px; }
.sec-label {
  display: inline-block; font-size: 13px; font-weight: 600;
  text-transform: uppercase; letter-spacing: 1.5px; color: var(--blue);
  margin-bottom: 12px;
}
.sec-title { font-size: 32px; font-weight: 700; line-height: 1.3; margin-bottom: 12px; }
.sec-sub { font-size: 16px; color: var(--gray-500); max-width: 640px; margin: 0 auto; }

/* ── Hero ── */
.hero {
  position: relative; overflow: hidden;
  padding: 80px 0 60px;
  background: linear-gradient(170deg, #e8f0fe 0%, #fce8e6 30%, #fef7e0 60%, #e6f4ea 100%);
}
.hero-inner {
  display: flex; align-items: center; gap: 60px;
  max-width: var(--max-w); margin: 0 auto; padding: 0 24px;
}
.hero-text { flex: 1; animation: fadeInUp .6s ease; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 14px; border-radius: 20px;
  background: rgba(66,133,244,.1); color: var(--blue);
  font-size: 13px; font-weight: 600; margin-bottom: 20px;
}
.hero-badge-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--green); }
.hero-title { font-size: 44px; font-weight: 800; line-height: 1.2; margin-bottom: 16px; }
.hero-title .gradient-text {
  background: var(--spectrum); -webkit-background-clip: text;
  -webkit-text-fill-color: transparent; background-clip: text;
  background-size: 200% 100%; animation: prismShift 4s ease infinite;
}
.hero-desc { font-size: 17px; color: var(--gray-700); margin-bottom: 28px; line-height: 1.8; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }
.hero-visual {
  flex: 1; display: flex; justify-content: center; align-items: center;
  animation: fadeInUp .6s ease .2s both;
}
.hero-prism {
  position: relative; width: 320px; height: 320px;
}
.prism-ring {
  position: absolute; inset: 0; border-radius: 50%;
  border: 3px dashed var(--gray-300);
  animation: spin 20s linear infinite;
}
.prism-core {
  position: absolute; inset: 40px; border-radius: 50%;
  background: var(--spectrum); background-size: 300% 300%;
  animation: prismShift 4s ease infinite;
  box-shadow: 0 0 60px rgba(66,133,244,.25), 0 0 60px rgba(234,67,53,.15);
}
.prism-dot {
  position: absolute; width: 14px; height: 14px; border-radius: 50%;
  box-shadow: var(--shadow-sm);
}
.prism-dot:nth-child(2) { top: -7px; left: 50%; transform: translateX(-50%); background: var(--red); }
.prism-dot:nth-child(3) { right: -7px; top: 50%; transform: translateY(-50%); background: var(--yellow); }
.prism-dot:nth-child(4) { bottom: -7px; left: 50%; transform: translateX(-50%); background: var(--green); }
.prism-dot:nth-child(5) { left: -7px; top: 50%; transform: translateY(-50%); background: var(--blue); }

/* ── Stats Bar ── */
.stats-bar {
  background: var(--white); border-top: 1px solid var(--gray-200);
  border-bottom: 1px solid var(--gray-200); padding: 32px 0;
}
.stats-row {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 24px; max-width: var(--max-w); margin: 0 auto; padding: 0 24px;
  text-align: center;
}
.stat-item { padding: 8px; }
.stat-num {
  font-size: 36px; font-weight: 800; line-height: 1.1;
  background: var(--spectrum); -webkit-background-clip: text;
  -webkit-text-fill-color: transparent; background-clip: text;
}
.stat-lbl { font-size: 14px; color: var(--gray-500); margin-top: 4px; }

/* ── Feature Cards ── */
.feat-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.feat-card {
  background: var(--white); border-radius: var(--radius);
  padding: 32px 28px; position: relative; overflow: hidden;
  box-shadow: var(--shadow-sm); transition: all .3s;
  border: 1px solid var(--gray-200);
}
.feat-card::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 4px;
  background: var(--spectrum-h); opacity: 0; transition: opacity .3s;
}
.feat-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-4px); }
.feat-card:hover::before { opacity: 1; }
.feat-card.blue::before { background: var(--blue); opacity: 1; }
.feat-card.red::before { background: var(--red); opacity: 1; }
.feat-card.yellow::before { background: var(--yellow); opacity: 1; }
.feat-card.green::before { background: var(--green); opacity: 1; }
.feat-icon {
  width: 48px; height: 48px; border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 16px;
}
.feat-icon.blue { background: rgba(66,133,244,.1); color: var(--blue); }
.feat-icon.red { background: rgba(234,67,53,.1); color: var(--red); }
.feat-icon.yellow { background: rgba(251,188,5,.1); color: var(--yellow); }
.feat-icon.green { background: rgba(52,168,83,.1); color: var(--green); }
.feat-name { font-size: 18px; font-weight: 700; margin-bottom: 8px; }
.feat-desc { font-size: 14px; color: var(--gray-500); line-height: 1.7; }

/* ── Platform Cards ── */
.plat-grid {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.plat-card {
  background: var(--white); border-radius: var(--radius);
  padding: 28px 24px; text-align: center;
  border: 1px solid var(--gray-200); transition: all .3s;
}
.plat-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.plat-ico {
  width: 56px; height: 56px; border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 14px;
}
.plat-ico.win { background: rgba(66,133,244,.1); color: var(--blue); }
.plat-ico.mac { background: rgba(52,168,83,.1); color: var(--green); }
.plat-ico.ios { background: rgba(234,67,53,.1); color: var(--red); }
.plat-ico.and { background: rgba(251,188,5,.1); color: var(--yellow); }
.plat-name { font-size: 16px; font-weight: 700; margin-bottom: 4px; }
.plat-ver { font-size: 13px; color: var(--gray-500); margin-bottom: 14px; }

/* ── Deep Feature Rows ── */
.deep-row {
  display: flex; align-items: center; gap: 48px;
  margin-bottom: 48px;
}
.deep-row.rev { flex-direction: row-reverse; }
.deep-info { flex: 1; }
.deep-badge {
  display: inline-block; font-size: 12px; font-weight: 600;
  padding: 4px 12px; border-radius: 12px; margin-bottom: 12px;
}
.deep-badge.blue { background: rgba(66,133,244,.1); color: var(--blue); }
.deep-badge.red { background: rgba(234,67,53,.1); color: var(--red); }
.deep-badge.yellow { background: rgba(251,188,5,.15); color: #b8860b; }
.deep-badge.green { background: rgba(52,168,83,.1); color: var(--green); }
.deep-title { font-size: 24px; font-weight: 700; margin-bottom: 10px; }
.deep-desc { font-size: 15px; color: var(--gray-500); line-height: 1.8; }
.deep-visual {
  flex: 1; display: flex; justify-content: center; align-items: center;
  min-height: 240px; border-radius: var(--radius);
  background: var(--gray-50); border: 1px solid var(--gray-200);
  overflow: hidden;
}
.deep-visual svg { width: 200px; height: 200px; }

/* ── Reviews ── */
.rev-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.rev-card {
  background: var(--white); border-radius: var(--radius);
  padding: 24px; border: 1px solid var(--gray-200);
  transition: box-shadow .3s;
}
.rev-card:hover { box-shadow: var(--shadow-md); }
.rev-top { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
.rev-avatar {
  width: 40px; height: 40px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 16px; color: var(--white);
}
.rev-avatar.blue { background: var(--blue); }
.rev-avatar.red { background: var(--red); }
.rev-avatar.yellow { background: var(--yellow); color: var(--gray-900); }
.rev-avatar.green { background: var(--green); }
.rev-info { flex: 1; }
.rev-name { font-size: 14px; font-weight: 600; }
.rev-stars { color: var(--yellow); font-size: 14px; }
.rev-text { font-size: 14px; color: var(--gray-500); line-height: 1.7; }

/* ── Comparison Table ── */
.cmp-wrap { overflow-x: auto; }
.cmp-table {
  width: 100%; border-collapse: collapse;
  background: var(--white); border-radius: var(--radius);
  overflow: hidden; box-shadow: var(--shadow-sm);
}
.cmp-table th {
  padding: 14px 20px; text-align: left;
  font-size: 14px; font-weight: 600; color: var(--white);
  background: var(--gray-900);
}
.cmp-table th:first-child { background: var(--gray-700); }
.cmp-table td {
  padding: 12px 20px; font-size: 14px;
  border-bottom: 1px solid var(--gray-200);
}
.cmp-table tr:hover td { background: var(--gray-50); }
.hl { color: var(--green); font-weight: 600; }

/* ── FAQ ── */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  border: 1px solid var(--gray-200); border-radius: var(--radius-sm);
  margin-bottom: 10px; overflow: hidden; transition: box-shadow .3s;
}
.faq-item:hover { box-shadow: var(--shadow-sm); }
.faq-q {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 20px; cursor: pointer; font-weight: 600; font-size: 15px;
  user-select: none; gap: 12px;
}
.faq-q:hover { color: var(--blue); }
.faq-chevron { transition: transform .3s; flex-shrink: 0; }
.faq-item.open .faq-chevron { transform: rotate(180deg); }
.faq-a {
  max-height: 0; overflow: hidden; transition: max-height .3s ease;
}
.faq-item.open .faq-a { max-height: 500px; }
.faq-a-inner {
  padding: 0 20px 16px; font-size: 14px; color: var(--gray-500); line-height: 1.8;
}

/* ── CTA Banner ── */
.cta-banner {
  text-align: center; padding: 60px 24px;
  border-radius: var(--radius); position: relative; overflow: hidden;
  background: linear-gradient(135deg, #e8f0fe, #fce8e6, #fef7e0, #e6f4ea);
  background-size: 300% 300%; animation: prismShift 8s ease infinite;
}
.cta-banner::before {
  content: ""; position: absolute; inset: 0;
  background: rgba(255,255,255,.7);
}
.cta-title { font-size: 28px; font-weight: 700; margin-bottom: 10px; position: relative; }
.cta-desc { font-size: 16px; color: var(--gray-500); margin-bottom: 24px; position: relative; }
.cta-banner .btn { position: relative; z-index: 1; }

/* ── Download Hero ── */
.dl-hero {
  padding: 60px 0 40px;
  background: linear-gradient(170deg, #e8f0fe 0%, #fce8e6 30%, #fef7e0 60%, #e6f4ea 100%);
}
.dl-hero-inner {
  max-width: var(--max-w); margin: 0 auto; padding: 0 24px;
  text-align: center;
}
.dl-title { font-size: 36px; font-weight: 800; margin-bottom: 8px; }
.dl-sub { font-size: 16px; color: var(--gray-500); margin-bottom: 32px; }
.dl-main {
  display: inline-flex; flex-direction: column; align-items: center;
  background: var(--white); border-radius: var(--radius);
  padding: 36px 48px; box-shadow: var(--shadow-lg);
  border: 2px solid var(--blue); position: relative;
}
.dl-main::before {
  content: ""; position: absolute; top: -2px; left: -2px; right: -2px;
  height: 4px; border-radius: var(--radius) var(--radius) 0 0;
  background: var(--spectrum-h);
}
.dl-main-icon { margin-bottom: 16px; }
.dl-main-title { font-size: 22px; font-weight: 700; margin-bottom: 6px; }
.dl-meta { display: flex; gap: 16px; margin-bottom: 20px; flex-wrap: wrap; justify-content: center; }
.dl-meta-item {
  font-size: 13px; color: var(--gray-500);
  display: flex; align-items: center; gap: 4px;
}
.dl-specs {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 12px; margin-top: 20px; width: 100%;
}
.dl-spec {
  text-align: center; padding: 10px;
  background: var(--gray-50); border-radius: var(--radius-sm);
}
.dl-spec-label { font-size: 11px; color: var(--gray-500); }
.dl-spec-val { font-size: 14px; font-weight: 600; }

/* ── Other Platforms ── */
.other-plats {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.op-card {
  background: var(--white); border-radius: var(--radius);
  padding: 28px 24px; text-align: center;
  border: 1px solid var(--gray-200); transition: all .3s;
}
.op-card:hover { box-shadow: var(--shadow-md); }
.op-ico {
  width: 48px; height: 48px; border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 12px;
}
.op-ico.mac { background: rgba(52,168,83,.1); color: var(--green); }
.op-ico.ios { background: rgba(234,67,53,.1); color: var(--red); }
.op-ico.and { background: rgba(251,188,5,.1); color: var(--yellow); }
.op-name { font-size: 16px; font-weight: 700; margin-bottom: 4px; }
.op-ver { font-size: 13px; color: var(--gray-500); margin-bottom: 14px; }

/* ── Guide Steps ── */
.guide-steps { max-width: 700px; margin: 0 auto; }
.gstep {
  display: flex; gap: 20px; margin-bottom: 24px;
  padding: 20px; background: var(--white);
  border-radius: var(--radius-sm); border: 1px solid var(--gray-200);
}
.gstep-num {
  width: 36px; height: 36px; border-radius: 50%; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 16px; color: var(--white);
  background: var(--blue);
}
.gstep-body { flex: 1; }
.gstep-title { font-size: 16px; font-weight: 600; margin-bottom: 4px; }
.gstep-desc { font-size: 14px; color: var(--gray-500); line-height: 1.7; }

/* ── Requirements ── */
.req-grid {
  display: grid; grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}
.req-card {
  background: var(--white); border-radius: var(--radius);
  padding: 24px; border: 1px solid var(--gray-200);
}
.req-ico {
  width: 40px; height: 40px; border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 12px; background: rgba(66,133,244,.1); color: var(--blue);
}
.req-title { font-size: 16px; font-weight: 700; margin-bottom: 8px; }
.req-desc { font-size: 14px; color: var(--gray-500); line-height: 1.7; }

/* ── Version Timeline ── */
.ver-list { max-width: 700px; margin: 0 auto; }
.ver-item {
  display: flex; gap: 16px; padding: 16px 0;
  border-bottom: 1px solid var(--gray-200);
}
.ver-item:last-child { border-bottom: none; }
.ver-dot {
  width: 12px; height: 12px; border-radius: 50%; margin-top: 6px;
  flex-shrink: 0; background: var(--blue);
  box-shadow: 0 0 0 4px rgba(66,133,244,.2);
}
.ver-tag {
  display: inline-block; font-size: 12px; font-weight: 600;
  padding: 2px 10px; border-radius: 10px;
  background: rgba(66,133,244,.1); color: var(--blue); margin-right: 8px;
}
.ver-date { font-size: 13px; color: var(--gray-500); }
.ver-body { flex: 1; }
.ver-body p { font-size: 14px; color: var(--gray-500); line-height: 1.7; margin-top: 4px; }

/* ── Security Banner ── */
.sec-banner {
  display: flex; align-items: center; gap: 16px;
  padding: 24px; border-radius: var(--radius);
  background: rgba(52,168,83,.06); border: 1px solid rgba(52,168,83,.2);
}
.sec-ico {
  width: 48px; height: 48px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0; background: rgba(52,168,83,.1); color: var(--green);
}
.sec-text { font-size: 14px; color: var(--gray-700); line-height: 1.7; }

/* ── Article Hero ── */
.article-hero {
  padding: 60px 0 40px;
  background: linear-gradient(170deg, #e8f0fe 0%, #fce8e6 30%, #fef7e0 60%, #e6f4ea 100%);
}
.article-hero-inner {
  max-width: var(--max-w); margin: 0 auto; padding: 0 24px;
}
.article-title { font-size: 36px; font-weight: 800; margin-bottom: 10px; }
.article-desc { font-size: 16px; color: var(--gray-500); margin-bottom: 20px; max-width: 700px; }
.kw-strip { display: flex; flex-wrap: wrap; gap: 8px; }
.kw {
  display: inline-block; padding: 5px 14px; border-radius: 16px;
  font-size: 13px; font-weight: 500; border: 1px solid var(--gray-300);
  color: var(--gray-700); background: var(--white);
}

/* ── Article Layout ── */
.article-layout {
  display: grid; grid-template-columns: 1fr 300px;
  gap: 40px; align-items: start;
}
.article-body h3 {
  font-size: 22px; font-weight: 700; margin: 36px 0 12px;
  padding-left: 14px; border-left: 4px solid var(--blue);
}
.article-body h3:nth-of-type(4n+2) { border-left-color: var(--red); }
.article-body h3:nth-of-type(4n+3) { border-left-color: var(--yellow); }
.article-body h3:nth-of-type(4n+4) { border-left-color: var(--green); }
.article-body p { font-size: 15px; color: var(--gray-500); line-height: 1.8; margin-bottom: 16px; }
.article-body ul { margin: 0 0 16px 20px; }
.article-body li { font-size: 15px; color: var(--gray-500); line-height: 1.8; margin-bottom: 4px; }

.inline-cta {
  background: linear-gradient(135deg, #e8f0fe, #fce8e6, #fef7e0, #e6f4ea);
  background-size: 300% 300%; animation: prismShift 8s ease infinite;
  border-radius: var(--radius); padding: 24px; text-align: center;
  margin: 32px 0; position: relative;
}
.inline-cta::before {
  content: ""; position: absolute; inset: 0;
  background: rgba(255,255,255,.75); border-radius: var(--radius);
}
.inline-cta p { position: relative; font-size: 15px; color: var(--gray-700); margin-bottom: 14px; }
.inline-cta .btn { position: relative; z-index: 1; }

/* ── Sidebar ── */
.sidebar { position: sticky; top: 80px; }
.sbox {
  background: var(--white); border-radius: var(--radius);
  padding: 20px; border: 1px solid var(--gray-200);
  margin-bottom: 16px;
}
.sbox-title {
  font-size: 15px; font-weight: 700; margin-bottom: 12px;
  padding-bottom: 8px; border-bottom: 2px solid var(--gray-100);
}
.sbox-links { display: flex; flex-direction: column; gap: 8px; }
.stoc a {
  display: block; font-size: 13px; color: var(--gray-500);
  padding: 4px 0; border-bottom: 1px solid var(--gray-100);
}
.stoc a:hover { color: var(--blue); text-decoration: none; }
.sstat { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.sstat-item { text-align: center; padding: 10px; background: var(--gray-50); border-radius: var(--radius-sm); }
.sstat-num { font-size: 20px; font-weight: 700; color: var(--blue); }
.sstat-lbl { font-size: 11px; color: var(--gray-500); }
.side-security {
  display: flex; align-items: center; gap: 8px;
  padding: 12px; border-radius: var(--radius-sm);
  background: rgba(52,168,83,.06); font-size: 13px; color: var(--green);
}

/* ── Footer ── */
.site-footer {
  background: var(--gray-900); color: var(--gray-300);
  padding: 40px 0 24px;
}
.footer-inner {
  max-width: var(--max-w); margin: 0 auto; padding: 0 24px;
  text-align: center;
}
.footer-brand { font-size: 18px; font-weight: 700; color: var(--white); margin-bottom: 12px; }
.security-line {
  font-size: 14px; color: var(--green); margin-bottom: 8px;
  display: flex; align-items: center; justify-content: center; gap: 6px;
}
.footer-note { font-size: 12px; color: var(--gray-500); line-height: 1.7; }

/* ── Buttons ── */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: 8px; padding: 12px 28px; border-radius: 24px;
  font-size: 15px; font-weight: 600; border: none; cursor: pointer;
  transition: all .2s; text-decoration: none;
}
.btn:hover { text-decoration: none; }
.btn-primary {
  background: var(--blue); color: var(--white);
  box-shadow: 0 2px 8px rgba(66,133,244,.3);
}
.btn-primary:hover { background: #3b78e7; box-shadow: 0 4px 16px rgba(66,133,244,.4); }
.btn-red { background: var(--red); color: var(--white); box-shadow: 0 2px 8px rgba(234,67,53,.3); }
.btn-red:hover { background: #d63328; }
.btn-green { background: var(--green); color: var(--white); box-shadow: 0 2px 8px rgba(52,168,83,.3); }
.btn-green:hover { background: #2d9449; }
.btn-outline {
  background: transparent; color: var(--gray-700);
  border: 2px solid var(--gray-300);
}
.btn-outline:hover { border-color: var(--blue); color: var(--blue); }
.btn-white { background: var(--white); color: var(--blue); box-shadow: var(--shadow-sm); }
.btn-white:hover { box-shadow: var(--shadow-md); }
.btn-lg { padding: 16px 36px; font-size: 17px; border-radius: 28px; }
.btn-sm { padding: 8px 18px; font-size: 13px; border-radius: 18px; }

/* ── Responsive ── */
@media (max-width: 900px) {
  .hero-inner { flex-direction: column; gap: 32px; text-align: center; }
  .hero-title { font-size: 32px; }
  .hero-actions { justify-content: center; }
  .hero-visual { order: -1; }
  .hero-prism { width: 220px; height: 220px; }
  .feat-grid { grid-template-columns: repeat(2, 1fr); }
  .plat-grid { grid-template-columns: repeat(2, 1fr); }
  .deep-row, .deep-row.rev { flex-direction: column; gap: 24px; }
  .rev-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-row { grid-template-columns: repeat(2, 1fr); }
  .article-layout { grid-template-columns: 1fr; }
  .sidebar { position: static; }
  .other-plats { grid-template-columns: 1fr; }
  .dl-specs { grid-template-columns: repeat(2, 1fr); }
  .req-grid { grid-template-columns: 1fr; }
}
@media (max-width: 600px) {
  .feat-grid { grid-template-columns: 1fr; }
  .plat-grid { grid-template-columns: 1fr; }
  .rev-grid { grid-template-columns: 1fr; }
  .stats-row { grid-template-columns: repeat(2, 1fr); }
  .navlist { gap: 0; }
  .navlist a { padding: 8px 10px; font-size: 13px; }
  .sec { padding: 48px 0; }
  .sec-title { font-size: 24px; }
  .dl-main { padding: 24px; }
  .dl-specs { grid-template-columns: 1fr 1fr; }
}