/* ── Aurora VPN mirror — arr.network design ── */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@400;500;600;700&display=swap');
@import url('https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.5.1/css/all.min.css');

/* ──────────────────────────────────────────────────────── tokens */
:root {
  --primary:        #5A47FF;
  --primary-dark:   #4736E0;
  --accent:         #15FFB5;
  --bg:             #141B39;
  --bg-alt:         #0F1530;
  --surface:        rgba(255,255,255,0.05);
  --surface-2:      rgba(255,255,255,0.08);
  --text:           #FFFFFF;
  --text-muted:     rgba(234,243,255,0.75);
  --text-nav:       #EAF3FF;
  --border:         rgba(255,255,255,0.10);
  --border-accent:  rgba(21,255,181,0.35);
  --header-bg:      rgba(20,27,57,0.92);
  --header-h:       68px;
  --radius-sm:      8px;
  --radius-md:      14px;
  --radius-lg:      20px;
  --radius-xl:      24px;
  --shadow-card:    0 4px 24px rgba(0,0,0,0.35);
  --shadow-lg:      0 8px 48px rgba(0,0,0,0.5);
  --grad-cta:       linear-gradient(85deg, #7606E0 -9.12%, #057EE1 105.03%, #22A17F 210.72%);
  --grad-brand:     linear-gradient(270deg, #8EF7FF 0%, #2EC7FF 45%, #417CFF 70%, #5A47FF 100%);
  --grad-aurora:    linear-gradient(135deg, #0F0826 0%, #141B39 30%, #1a2060 60%, #0d1f3c 100%);
  --space-xs:       0.5rem;
  --space-sm:       1rem;
  --space-md:       1.5rem;
  --space-lg:       2.5rem;
  --space-xl:       4rem;
  --transition:     0.25s ease;
  --max-w:          1200px;
  --green:          #22c55e;
  --red:            #ef4444;
}

/* ──────────────────────────────────────────────────────── reset */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; overflow-x: clip; max-width: 100%; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Noto Sans SC', sans-serif;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: clip;
}
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
h1,h2,h3,h4 { line-height: 1.3; }
h2 { font-size: clamp(1.6rem,3vw,2.2rem); font-weight: 700; }
h3 { font-size: clamp(1.05rem,2vw,1.25rem); font-weight: 600; }
p { color: var(--text-muted); }

/* ──────────────────────────────────────────────────────── util */
.brand-gradient {
  background: var(--grad-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.btn-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4em;
  background: var(--grad-cta);
  color: #fff;
  font-size: 1rem;
  font-weight: 600;
  padding: 0.75em 1.8em;
  border-radius: 50px;
  border: none;
  cursor: pointer;
  transition: opacity var(--transition), transform var(--transition), box-shadow var(--transition);
  white-space: nowrap;
}
.btn-cta:hover { opacity: 0.9; transform: translateY(-2px); box-shadow: 0 8px 24px rgba(90,71,255,0.45); }
.btn-cta.btn-lg { font-size: 1.1rem; padding: 0.9em 2.4em; }
.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75em 1.8em;
  border-radius: 50px;
  border: 1.5px solid rgba(255,255,255,0.3);
  color: var(--text);
  font-size: 1rem;
  font-weight: 500;
  background: transparent;
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition), transform var(--transition);
  white-space: nowrap;
}
.btn-ghost:hover { border-color: var(--accent); background: rgba(21,255,181,0.07); transform: translateY(-2px); }

/* ──────────────────────────────────────────────────────── header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  background: var(--header-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.5rem;
  height: var(--header-h);
  display: flex;
  align-items: center;
  gap: 2rem;
}
.logo { flex-shrink: 0; display: flex; align-items: center; }
.main-nav {
  flex: 1;
  display: flex;
  gap: 0.25rem;
  align-items: center;
}
.main-nav a {
  color: var(--text-nav);
  font-size: 0.95rem;
  font-weight: 500;
  padding: 0.4em 0.9em;
  border-radius: var(--radius-sm);
  transition: background var(--transition), color var(--transition);
}
.main-nav a:hover, .main-nav a.active { color: #fff; background: var(--surface-2); }
.header-cta { margin-left: auto; flex-shrink: 0; }
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  margin-left: auto;
  flex-shrink: 0;
}
.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}
.hamburger[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.hamburger[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
.mobile-menu {
  display: none;
  flex-direction: column;
  gap: 0.5rem;
  padding: 1rem 1.5rem 1.5rem;
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
}
.mobile-menu ul { display: flex; flex-direction: column; gap: 0.25rem; }
.mobile-menu a {
  display: block;
  padding: 0.65em 1em;
  color: var(--text-nav);
  font-size: 1rem;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
}
.mobile-menu a:hover { background: var(--surface-2); }
.mobile-menu .btn-cta { margin-top: 0.5rem; width: 100%; text-align: center; }
.mobile-menu.open { display: flex; }

/* ──────────────────────────────────────────────────────── hero */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding: calc(var(--header-h) + 2rem) 1.5rem 4rem;
}
.hero-aurora {
  position: absolute;
  inset: 0;
  background: var(--grad-aurora);
  z-index: 0;
}
.hero-aurora::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 20% 40%, rgba(118,6,224,0.25) 0%, transparent 60%),
    radial-gradient(ellipse 60% 50% at 80% 60%, rgba(5,126,225,0.2) 0%, transparent 55%),
    radial-gradient(ellipse 40% 40% at 50% 80%, rgba(34,161,127,0.15) 0%, transparent 50%);
  animation: aurora-shift 12s ease-in-out infinite alternate;
}
@keyframes aurora-shift {
  0%   { opacity: 0.8; transform: scale(1); }
  100% { opacity: 1; transform: scale(1.05); }
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(rgba(20,27,57,0.35) 0%, rgba(20,27,57,0.55) 100%);
  z-index: 1;
}
.hero-inner {
  position: relative;
  z-index: 2;
  max-width: var(--max-w);
  margin: 0 auto;
  width: 100%;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: center;
}
.hero-content { display: flex; flex-direction: column; gap: 1.4rem; }
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.15);
  backdrop-filter: blur(8px);
  padding: 0.4em 1em;
  border-radius: 50px;
  font-size: 0.85rem;
  color: var(--text-nav);
  width: fit-content;
}
.hero-content h1 {
  font-size: clamp(2rem, 5vw, 3.4rem);
  font-weight: 700;
  line-height: 1.2;
  color: #fff;
}
.update-time {
  display: inline-block;
  font-size: 0.8rem;
  color: rgba(255,255,255,0.45);
}
.hero-sub {
  font-size: 1.05rem;
  color: rgba(255,255,255,0.78);
  max-width: 520px;
  line-height: 1.75;
}
.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
}
.hero-scroll-indicator {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  margin-top: 0.5rem;
}
.hero-scroll-indicator span {
  display: block;
  width: 2px;
  height: 40px;
  background: linear-gradient(to bottom, rgba(255,255,255,0.6), transparent);
  border-radius: 2px;
  animation: scroll-flow 1.4s ease-in-out infinite;
}
@keyframes scroll-flow {
  0%   { transform: scaleY(0); transform-origin: top; }
  50%  { transform: scaleY(1); transform-origin: top; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}
/* device mockup */
.hero-visual {
  display: flex;
  align-items: center;
  justify-content: center;
}
.hero-device-wrap {
  position: relative;
  width: 300px;
  height: 300px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.orbit-ring {
  position: absolute;
  inset: 0;
  border: 1.5px solid rgba(90,71,255,0.4);
  border-radius: 50%;
  animation: orbit-spin 40s linear infinite;
}
.orbit-ring::after {
  content: '';
  position: absolute;
  top: -5px;
  left: 50%;
  transform: translateX(-50%);
  width: 10px;
  height: 10px;
  background: var(--accent);
  border-radius: 50%;
  box-shadow: 0 0 12px var(--accent);
}
@keyframes orbit-spin { to { transform: rotate(360deg); } }
.device-mockup {
  width: 220px;
  background: rgba(20,27,57,0.85);
  border: 1px solid rgba(90,71,255,0.35);
  border-radius: var(--radius-xl);
  backdrop-filter: blur(12px);
  overflow: hidden;
  box-shadow: var(--shadow-lg), 0 0 60px rgba(90,71,255,0.2);
}
.device-screen {
  padding: 1.5rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: center;
  text-align: center;
}
.device-status {
  display: flex;
  align-items: center;
  gap: 0.5em;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
}
.status-dot {
  width: 8px;
  height: 8px;
  background: var(--accent);
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
  box-shadow: 0 0 8px var(--accent);
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: 0.6; transform: scale(1.2); }
}
.device-location {
  display: flex;
  align-items: center;
  gap: 0.4em;
  font-size: 0.8rem;
  color: var(--text-muted);
  background: var(--surface-2);
  padding: 0.4em 0.9em;
  border-radius: 50px;
}
.device-speed {
  display: flex;
  gap: 1.5rem;
  font-size: 0.75rem;
  color: var(--text-muted);
}
.speed-val { font-weight: 700; color: #fff; font-size: 1rem; }
.device-btn { display: flex; justify-content: center; }
.device-btn .btn-cta { font-size: 0.8rem; padding: 0.55em 1.3em; }

/* ──────────────────────────────────────────────────────── page hero */
.page-hero {
  position: relative;
  padding: calc(var(--header-h) + 3rem) 1.5rem 4rem;
  text-align: center;
  overflow: hidden;
}
.page-hero-aurora {
  position: absolute;
  inset: 0;
  background: var(--grad-aurora);
}
.page-hero-aurora::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 70% 80% at 50% 50%, rgba(90,71,255,0.2) 0%, transparent 65%);
}
.page-hero-inner {
  position: relative;
  z-index: 2;
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
}
.page-hero-inner h1 { font-size: clamp(1.8rem,4vw,2.8rem); font-weight: 700; text-align: center; }
.page-hero-inner p { font-size: 1.05rem; color: rgba(255,255,255,0.75); text-align: center; }
.page-hero-cta { margin-top: 0.5rem; }

/* ──────────────────────────────────────────────────────── sections */
.content-section {
  padding: var(--space-xl) 1.5rem;
}
.content-section.alt {
  background: var(--bg-alt);
}
.section-inner {
  max-width: var(--max-w);
  margin: 0 auto;
}
.section-header {
  text-align: center;
  margin-bottom: var(--space-lg);
}
.section-header h2 { margin-bottom: 0.6rem; }
.section-sub { font-size: 1.05rem; color: var(--text-muted); max-width: 580px; margin: 0 auto; }
.content-section p { margin-bottom: 1rem; color: var(--text-muted); }
.content-section p:last-child { margin-bottom: 0; }

/* ──────────────────────────────────────────────────────── features with images */
.features-img-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
.feature-img-block {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}
.feature-img-block:hover {
  transform: translateY(-4px);
  border-color: rgba(90,71,255,0.4);
  box-shadow: 0 8px 32px rgba(90,71,255,0.15);
}
.feature-img-wrap { width: 100%; height: 160px; overflow: hidden; }
.feature-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.feature-img-block:hover .feature-img-wrap img { transform: scale(1.05); }
.feature-img-body { padding: 1.25rem 1.25rem 1.5rem; }
.feature-img-body h3 { font-size: 1.05rem; margin-bottom: 0.5rem; color: #fff; }
.feature-img-body p { font-size: 0.875rem; color: var(--text-muted); margin: 0; line-height: 1.6; }

/* ──────────────────────────────────────────────────────── device cards */
.device-cards-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}
.device-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 2rem 1.25rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}
.device-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-accent);
  box-shadow: 0 8px 32px rgba(21,255,181,0.1);
}
.device-icon { width: 64px; height: 64px; display: flex; align-items: center; justify-content: center; }
.device-icon i { font-size: 2.5rem; color: var(--accent); }
.device-card h3 { font-size: 1.1rem; color: #fff; }
.device-card ul { text-align: left; width: 100%; }
.device-card li {
  font-size: 0.85rem;
  color: var(--text-muted);
  padding: 0.3em 0;
  padding-left: 1.2em;
  position: relative;
}
.device-card li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 700;
}
.device-card .btn-cta { width: 100%; }

/* ──────────────────────────────────────────────────────── pricing */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  align-items: start;
}
.price-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 2rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  position: relative;
  transition: transform var(--transition), box-shadow var(--transition);
}
.price-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-card); }
.price-card--popular {
  border-color: var(--border-accent);
  background: linear-gradient(145deg, rgba(21,255,181,0.08) 0%, rgba(90,71,255,0.08) 100%);
  box-shadow: 0 0 40px rgba(21,255,181,0.1);
}
.popular-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent);
  color: #0a1428;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.25em 1em;
  border-radius: 50px;
  white-space: nowrap;
}
.price-name { font-size: 1.05rem; font-weight: 700; color: #fff; }
.price-amount { font-size: 2.5rem; font-weight: 800; color: #fff; line-height: 1; }
.price-period { font-size: 0.8rem; color: var(--text-muted); }
.price-features { display: flex; flex-direction: column; gap: 0.5rem; margin: 0.5rem 0; flex: 1; }
.price-features li {
  font-size: 0.88rem;
  color: var(--text-muted);
  padding-left: 1.4em;
  position: relative;
}
.price-features li::before { content: '✓'; position: absolute; left: 0; color: var(--accent); font-weight: 700; }
.price-card .btn-cta { width: 100%; text-align: center; margin-top: auto; }

/* ──────────────────────────────────────────────────────── compare table */
.compare-table {
  width: 100%;
  border-collapse: collapse;
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.compare-table th, .compare-table td {
  padding: 1rem 1.25rem;
  text-align: left;
  font-size: 0.9rem;
  border-bottom: 1px solid var(--border);
}
.compare-table thead { background: var(--surface-2); }
.compare-table th { font-weight: 600; color: var(--text); }
.compare-table th.highlight, .compare-table td.highlight {
  background: rgba(21,255,181,0.07);
  color: var(--accent);
  font-weight: 600;
}
.compare-table tbody tr:hover { background: var(--surface); }
.compare-table td { color: var(--text-muted); }

/* ──────────────────────────────────────────────────────── stats */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  margin-top: 0.5rem;
}
.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 2rem 1.5rem;
  text-align: center;
  transition: transform var(--transition), border-color var(--transition);
}
.stat-card:hover { transform: translateY(-4px); border-color: rgba(90,71,255,0.4); }
.stat-card i { font-size: 1.75rem; color: var(--accent); margin-bottom: 0.75rem; display: block; }
.stat-num { font-size: 2.2rem; font-weight: 800; color: #fff; line-height: 1.2; }
.stat-label { font-size: 0.9rem; color: var(--text-muted); margin-top: 0.35rem; }

/* ──────────────────────────────────────────────────────── marquee reviews */
.reviews-section {
  padding: var(--space-xl) 0;
  overflow: hidden;
  background: var(--bg-alt);
}
.reviews-section .section-inner {
  padding: 0 1.5rem;
}
.marquee-wrap {
  overflow: hidden;
  margin-top: var(--space-lg);
  padding: 0.5rem 0;
  cursor: grab;
}
.marquee-track {
  display: flex;
  gap: 1.25rem;
  width: max-content;
  animation: marquee-scroll 60s linear infinite;
}
.marquee-track:hover { animation-play-state: paused; }
@keyframes marquee-scroll {
  0%   { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}
@media (prefers-reduced-motion: reduce) {
  .marquee-track { animation: none; }
}
.review-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 1.5rem;
  width: 260px;
  flex-shrink: 0;
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}
.review-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--grad-cta);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1rem;
  color: #fff;
  flex-shrink: 0;
}
.review-body { flex: 1; min-width: 0; }
.review-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.5rem;
}
.review-name { font-size: 0.9rem; font-weight: 600; color: #fff; }
.review-stars { color: var(--accent); font-size: 0.75rem; letter-spacing: 1px; }
.review-text { font-size: 0.85rem; color: var(--text-muted); line-height: 1.6; margin: 0; }

/* ──────────────────────────────────────────────────────── certifications */
.certs-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
.cert-block {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}
.cert-block:hover {
  transform: translateY(-4px);
  border-color: rgba(90,71,255,0.4);
  box-shadow: var(--shadow-card);
}
.cert-img-wrap { width: 100%; height: 180px; overflow: hidden; }
.cert-img-wrap img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s ease; }
.cert-block:hover .cert-img-wrap img { transform: scale(1.05); }
.cert-body { padding: 1.5rem; }
.cert-date { font-size: 0.8rem; color: var(--text-muted); display: block; margin-bottom: 0.5rem; }
.cert-body h3 { font-size: 1.05rem; color: #fff; margin-bottom: 0.75rem; }
.cert-body p { font-size: 0.875rem; color: var(--text-muted); margin-bottom: 1rem; line-height: 1.6; }
.cert-link {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--accent);
  transition: opacity var(--transition);
}
.cert-link:hover { opacity: 0.75; }

/* ──────────────────────────────────────────────────────── payment methods */
.payment-methods {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
  margin-top: 1rem;
}
.payment-methods li {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.5em 1.25em;
  font-size: 0.9rem;
  color: var(--text-nav);
}

/* ──────────────────────────────────────────────────────── content list */
.content-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.content-list li {
  color: var(--text-muted);
  padding-left: 1.5em;
  position: relative;
  font-size: 0.95rem;
  line-height: 1.65;
}
.content-list li::before {
  content: '●';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-size: 0.6em;
  top: 0.45em;
}

/* ──────────────────────────────────────────────────────── FAQ */
.faq-section {
  padding: var(--space-xl) 1.5rem;
  background: var(--bg-alt);
}
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  max-width: 800px;
  margin: 0 auto;
}
.faq-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition);
}
.faq-item[open] { border-color: rgba(90,71,255,0.4); }
.faq-item summary {
  padding: 1.1rem 1.5rem;
  font-size: 0.95rem;
  font-weight: 600;
  color: #fff;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  user-select: none;
  transition: background var(--transition);
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: '+';
  font-size: 1.25rem;
  color: var(--accent);
  flex-shrink: 0;
  transition: transform var(--transition);
}
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-item summary:hover { background: var(--surface-2); }
.faq-ans {
  padding: 0 1.5rem 1.25rem;
}
.faq-ans p { margin: 0; color: var(--text-muted); font-size: 0.9rem; line-height: 1.7; }

/* ──────────────────────────────────────────────────────── closing CTA */
.content-section .hero-cta-group {
  justify-content: center;
  margin-top: 1rem;
}

/* ──────────────────────────────────────────────────────── footer */
.site-footer {
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  padding: var(--space-xl) 1.5rem var(--space-lg);
}
.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
}
.footer-brand .logo { margin-bottom: 1rem; }
.footer-tagline { font-size: 0.875rem; color: var(--text-muted); line-height: 1.6; }
.footer-col h3 { font-size: 0.9rem; font-weight: 700; color: #fff; margin-bottom: 1rem; text-transform: uppercase; letter-spacing: 0.05em; }
.footer-col ul { display: flex; flex-direction: column; gap: 0.5rem; }
.footer-col a { font-size: 0.875rem; color: var(--text-muted); transition: color var(--transition); }
.footer-col a:hover { color: #fff; }
.footer-bottom {
  max-width: var(--max-w);
  margin: var(--space-lg) auto 0;
  padding-top: var(--space-sm);
  border-top: 1px solid var(--border);
  text-align: center;
}
.footer-bottom p { font-size: 0.8rem; color: rgba(255,255,255,0.35); margin: 0; }

/* ──────────────────────────────────────────────────────── scroll fade-in */
.fade-in { opacity: 0; transform: translateY(20px); transition: opacity 0.6s ease-out, transform 0.6s ease-out; }
.fade-in.visible { opacity: 1; transform: translateY(0); }
@media (prefers-reduced-motion: reduce) { .fade-in { opacity: 1; transform: none; } }

/* ──────────────────────────────────────────────────────── responsive */
@media (max-width: 1024px) {
  .pricing-grid { grid-template-columns: repeat(2, 1fr); }
  .features-img-grid { grid-template-columns: repeat(2, 1fr); }
  .device-cards-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-inner { grid-template-columns: 1fr 1fr; gap: 2rem; }
  .certs-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  :root { --space-xl: 3rem; --space-lg: 2rem; }
  .main-nav, .header-cta { display: none; }
  .hamburger { display: flex; }
  .hero-inner { grid-template-columns: 1fr; text-align: center; }
  .hero-content { align-items: center; order: 2; }
  .hero-visual { order: 1; }
  .hero-cta-group { justify-content: center; flex-direction: column; align-items: center; }
  .hero-sub { max-width: 100%; }
  .hero-scroll-indicator { justify-content: center; }
  .features-img-grid { grid-template-columns: 1fr; }
  .device-cards-grid { grid-template-columns: repeat(2, 1fr); }
  .pricing-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .certs-grid { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr 1fr; gap: 1.5rem; }
  .footer-brand { grid-column: 1 / -1; }
  .compare-table { font-size: 0.8rem; overflow-x: auto; display: block; }
  .compare-table th, .compare-table td { padding: 0.7rem 0.75rem; }
  .hero-device-wrap { width: 220px; height: 220px; }
  .device-mockup { width: 180px; }
}
@media (max-width: 480px) {
  .hero-inner { gap: var(--space-md); }
  .device-cards-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 360px) {
  .header-inner { padding: 0 1rem; }
  .hero { padding: calc(var(--header-h) + 1rem) 1rem 3rem; }
  .hero-badge { font-size: 0.78rem; }
  .btn-cta, .btn-ghost { font-size: 0.9rem; padding: 0.7em 1.4em; }
}