/* ========================================
   快连VPN | 现代科技风格设计系统
   ======================================== */

/* === CSS Variables === */
:root {
  --bg-primary: #080b1a;
  --bg-secondary: #0d1127;
  --bg-card: rgba(255, 255, 255, 0.03);
  --bg-card-hover: rgba(255, 255, 255, 0.06);
  
  --accent: #00d4aa;
  --accent-light: #00f5d4;
  --accent-dark: #00b894;
  --accent-glow: rgba(0, 212, 170, 0.3);
  
  --text-primary: #ffffff;
  --text-secondary: rgba(255, 255, 255, 0.7);
  --text-muted: rgba(255, 255, 255, 0.4);
  
  --gradient-primary: linear-gradient(135deg, #00d4aa 0%, #5b9cf5 50%, #a78bfa 100%);
  --gradient-card: linear-gradient(135deg, rgba(0, 212, 170, 0.1) 0%, rgba(91, 156, 245, 0.1) 100%);
  --gradient-hero: linear-gradient(180deg, #080b1a 0%, #0d1530 50%, #0d1127 100%);
  
  --border: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(255, 255, 255, 0.15);
  
  --radius-sm: 12px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  
  --shadow-sm: 0 4px 20px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 8px 40px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 60px var(--accent-glow);
  
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

/* === Reset & Base === */
* { margin: 0; padding: 0; box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

::selection {
  background: var(--accent);
  color: var(--bg-primary);
}

/* === Animated Background === */
.bg-canvas {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  z-index: 0;
  pointer-events: none;
}

.bg-grid {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  z-index: 0;
  pointer-events: none;
  background-image: 
    linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
}

/* === Floating Orbs === */
.orb {
  position: fixed;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.4;
  pointer-events: none;
  z-index: 0;
  animation: orbFloat 20s ease-in-out infinite;
}

.orb-1 {
  width: 500px; height: 500px;
  top: -15%; right: -10%;
  background: radial-gradient(circle, rgba(0, 212, 170, 0.3), transparent);
  animation-delay: 0s;
}

.orb-2 {
  width: 400px; height: 400px;
  bottom: -10%; left: -5%;
  background: radial-gradient(circle, rgba(91, 156, 245, 0.25), transparent);
  animation-delay: -7s;
  animation-duration: 18s;
}

.orb-3 {
  width: 300px; height: 300px;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  background: radial-gradient(circle, rgba(167, 139, 250, 0.15), transparent);
  animation-delay: -14s;
  animation-duration: 22s;
}

@keyframes orbFloat {
  0%, 100% { transform: translate(0, 0) scale(1); }
  25% { transform: translate(60px, -40px) scale(1.1); }
  50% { transform: translate(-30px, 50px) scale(0.9); }
  75% { transform: translate(-50px, -30px) scale(1.05); }
}

/* === Navigation === */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 16px 40px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: var(--transition);
}

.navbar.scrolled {
  background: rgba(8, 11, 26, 0.85);
  backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border);
  padding: 12px 40px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand-logo {
  width: 40px; height: 40px;
  background: var(--gradient-primary);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  box-shadow: 0 4px 15px var(--accent-glow);
}

.brand-text {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.5px;
}

.brand-text span {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  gap: 8px;
  align-items: center;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  padding: 10px 20px;
  border-radius: 50px;
  font-size: 14px;
  font-weight: 500;
  transition: var(--transition);
  position: relative;
}

.nav-link:hover {
  color: var(--text-primary);
  background: var(--bg-card);
}

.nav-link.active {
  color: var(--accent);
  background: rgba(0, 212, 170, 0.1);
}

/* === Buttons === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 50px;
  text-decoration: none;
  font-weight: 600;
  font-size: 15px;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  letter-spacing: -0.2px;
}

.btn::before {
  content: '';
  position: absolute;
  top: 0; left: -100%;
  width: 100%; height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.15), transparent);
  transition: left 0.5s;
}

.btn:hover::before {
  left: 100%;
}

.btn-primary {
  background: var(--gradient-primary);
  color: #fff;
  box-shadow: 0 4px 25px var(--accent-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 40px var(--accent-glow);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-2px);
}

.btn-large {
  padding: 18px 40px;
  font-size: 17px;
}

.btn-download {
  width: 100%;
  padding: 18px;
  font-size: 17px;
}

/* === Hero Section === */
.hero-section {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 100px 24px 60px;
  position: relative;
  z-index: 1;
}

.hero-content {
  text-align: center;
  max-width: 900px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  border-radius: 50px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  font-size: 14px;
  color: var(--accent);
  margin-bottom: 32px;
  animation: fadeInUp 0.8s ease-out;
}

.hero-badge .dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 10px var(--accent);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.8); }
}

.hero-title {
  font-size: clamp(42px, 7vw, 72px);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 24px;
  letter-spacing: -1.5px;
}

.hero-title .gradient-text {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: clamp(16px, 2vw, 20px);
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 48px;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* === Hero Visual === */
.hero-visual {
  position: relative;
  width: 260px;
  height: 260px;
  margin: 0 auto 50px;
}

.shield {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: 100px;
  height: 120px;
  background: var(--gradient-primary);
  clip-path: polygon(50% 0%, 100% 25%, 100% 55%, 50% 100%, 0% 55%, 0% 25%);
  z-index: 2;
  animation: shieldFloat 4s ease-in-out infinite;
  box-shadow: 0 0 60px var(--accent-glow);
}

@keyframes shieldFloat {
  0%, 100% { transform: translate(-50%, -50%); }
  50% { transform: translate(-50%, -60%); }
}

.shield-ring {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  border: 1.5px solid rgba(255,255,255,0.1);
  border-radius: 50%;
  animation: ringExpand 3s ease-out infinite;
}

.shield-ring:nth-child(2) { width: 180px; height: 180px; animation-delay: 0s; }
.shield-ring:nth-child(3) { width: 220px; height: 220px; animation-delay: 1s; }
.shield-ring:nth-child(4) { width: 260px; height: 260px; animation-delay: 2s; }

@keyframes ringExpand {
  0% { opacity: 0.6; transform: translate(-50%, -50%) scale(0.85); }
  100% { opacity: 0; transform: translate(-50%, -50%) scale(1.15); }
}

/* === Stats Section === */
.stats-row {
  display: flex;
  gap: 24px;
  margin-top: 80px;
  flex-wrap: wrap;
  justify-content: center;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 48px;
  text-align: center;
  backdrop-filter: blur(10px);
  transition: var(--transition);
  min-width: 180px;
}

.stat-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent);
  box-shadow: 0 0 40px rgba(0, 212, 170, 0.1);
  transform: translateY(-4px);
}

.stat-icon {
  font-size: 28px;
  margin-bottom: 12px;
}

.stat-number {
  display: block;
  font-size: 36px;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -1px;
}

.stat-label {
  display: block;
  color: var(--text-muted);
  font-size: 13px;
  margin-top: 6px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* === Features Section === */
.features-section {
  padding: 120px 40px;
  position: relative;
  z-index: 1;
}

.section-header {
  text-align: center;
  margin-bottom: 80px;
}

.section-label {
  display: inline-block;
  padding: 6px 16px;
  border-radius: 50px;
  background: rgba(0, 212, 170, 0.1);
  border: 1px solid rgba(0, 212, 170, 0.2);
  color: var(--accent);
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 20px;
}

.section-title {
  font-size: clamp(32px, 5vw, 48px);
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: -1px;
}

.section-desc {
  color: var(--text-secondary);
  font-size: 18px;
  max-width: 500px;
  margin: 0 auto;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  max-width: 1200px;
  margin: 0 auto;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 40px 32px;
  transition: var(--transition-slow);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background: var(--gradient-card);
  opacity: 0;
  transition: var(--transition);
}

.feature-card:hover::before {
  opacity: 1;
}

.feature-card:hover {
  border-color: var(--accent);
  transform: translateY(-8px);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3), 0 0 40px rgba(0, 212, 170, 0.05);
}

.feature-icon {
  width: 56px; height: 56px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: 24px;
  position: relative;
  z-index: 1;
}

.feature-card:nth-child(1) .feature-icon { background: linear-gradient(135deg, rgba(0,212,170,0.2), rgba(0,212,170,0.05)); }
.feature-card:nth-child(2) .feature-icon { background: linear-gradient(135deg, rgba(91,156,245,0.2), rgba(91,156,245,0.05)); }
.feature-card:nth-child(3) .feature-icon { background: linear-gradient(135deg, rgba(167,139,250,0.2), rgba(167,139,250,0.05)); }
.feature-card:nth-child(4) .feature-icon { background: linear-gradient(135deg, rgba(245,158,11,0.2), rgba(245,158,11,0.05)); }

.feature-card h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 10px;
  position: relative;
  z-index: 1;
}

.feature-card p {
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 1.7;
  position: relative;
  z-index: 1;
}

/* === Pricing Section === */
.pricing-section {
  padding: 80px 40px 120px;
  position: relative;
  z-index: 1;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
  max-width: 1000px;
  margin: 0 auto;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 40px 32px;
  text-align: center;
  transition: var(--transition);
  position: relative;
}

.pricing-card.featured {
  border-color: var(--accent);
  background: linear-gradient(180deg, rgba(0, 212, 170, 0.08) 0%, var(--bg-card) 50%);
  box-shadow: 0 0 60px rgba(0, 212, 170, 0.08);
}

.pricing-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-hover);
}

.pricing-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient-primary);
  color: #fff;
  padding: 6px 20px;
  border-radius: 50px;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.pricing-name {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--text-primary);
}

.pricing-price {
  font-size: 48px;
  font-weight: 800;
  margin-bottom: 8px;
  letter-spacing: -2px;
}

.pricing-price .currency {
  font-size: 24px;
  font-weight: 600;
}

.pricing-period {
  color: var(--text-muted);
  font-size: 14px;
  margin-bottom: 32px;
}

.pricing-features {
  list-style: none;
  text-align: left;
  margin-bottom: 32px;
}

.pricing-features li {
  padding: 10px 0;
  color: var(--text-secondary);
  font-size: 14px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.pricing-features li::before {
  content: '✓';
  color: var(--accent);
  font-weight: 700;
  font-size: 16px;
}

.pricing-card .btn {
  width: 100%;
}

/* === Testimonials Section === */
.testimonials-section {
  padding: 80px 40px 120px;
  position: relative;
  z-index: 1;
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
  max-width: 1100px;
  margin: 0 auto;
}

.testimonial-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 32px;
  transition: var(--transition);
}

.testimonial-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-4px);
}

.testimonial-stars {
  color: #fbbf24;
  font-size: 18px;
  margin-bottom: 16px;
  letter-spacing: 2px;
}

.testimonial-text {
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 1.8;
  margin-bottom: 20px;
  font-style: italic;
}

.testimonial-user {
  display: flex;
  align-items: center;
  gap: 12px;
}

.testimonial-avatar {
  width: 40px; height: 40px;
  border-radius: 50%;
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
}

.testimonial-author {
  font-size: 14px;
  font-weight: 600;
}

.testimonial-role {
  font-size: 12px;
  color: var(--text-muted);
}

/* === CTA Section === */
.cta-section {
  padding: 60px 40px 120px;
  position: relative;
  z-index: 1;
}

.cta-card {
  max-width: 800px;
  margin: 0 auto;
  padding: 60px 40px;
  border-radius: var(--radius-xl);
  background: linear-gradient(135deg, rgba(0, 212, 170, 0.1) 0%, rgba(91, 156, 245, 0.08) 100%);
  border: 1px solid rgba(0, 212, 170, 0.2);
  text-align: center;
  backdrop-filter: blur(10px);
}

.cta-title {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: -1px;
}

.cta-desc {
  color: var(--text-secondary);
  font-size: 16px;
  margin-bottom: 36px;
  max-width: 450px;
  margin-left: auto;
  margin-right: auto;
}

/* === Download Page === */
.download-section {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 120px 24px 60px;
  position: relative;
  z-index: 1;
}

.download-card {
  max-width: 480px;
  width: 100%;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 48px 40px;
  text-align: center;
  backdrop-filter: blur(20px);
}

.download-visual {
  position: relative;
  width: 120px;
  height: 120px;
  margin: 0 auto 32px;
}

.app-icon {
  width: 100px; height: 100px;
  background: var(--gradient-primary);
  border-radius: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 44px;
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  z-index: 2;
  box-shadow: 0 10px 40px var(--accent-glow);
}

.app-rings .ring {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  border: 1.5px solid rgba(0, 212, 170, 0.2);
  border-radius: 50%;
  animation: ringExpand 3s ease-out infinite;
}

.app-rings .ring:nth-child(1) { width: 100px; height: 100px; animation-delay: 0s; }
.app-rings .ring:nth-child(2) { width: 120px; height: 120px; animation-delay: 1s; }

.download-title {
  font-size: 32px;
  font-weight: 800;
  margin-bottom: 8px;
}

.download-desc {
  color: var(--text-secondary);
  font-size: 15px;
  margin-bottom: 24px;
}

.version-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 24px;
  border-radius: 50px;
  background: rgba(0, 212, 170, 0.1);
  border: 1px solid rgba(0, 212, 170, 0.2);
  color: var(--accent);
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 32px;
}

.download-info {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 36px;
}

.download-info .info-item {
  padding: 16px 12px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}

.info-label {
  display: block;
  color: var(--text-muted);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 6px;
}

.info-value {
  display: block;
  color: var(--text-primary);
  font-weight: 600;
  font-size: 14px;
}

.platform-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  margin-bottom: 28px;
}

.platform-tag {
  padding: 8px 16px;
  border-radius: 50px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 13px;
  cursor: pointer;
  transition: var(--transition);
}

.platform-tag:hover,
.platform-tag.active {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(0, 212, 170, 0.1);
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 14px;
  margin-top: 24px;
  transition: var(--transition);
}

.back-link:hover {
  color: var(--accent);
}

/* === 404 Page === */
.error-section {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 120px 24px 60px;
  position: relative;
  z-index: 1;
}

.error-content {
  text-align: center;
  max-width: 500px;
}

.error-code {
  font-size: clamp(100px, 15vw, 160px);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -4px;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 16px;
}

.error-visual {
  font-size: 64px;
  margin-bottom: 24px;
  opacity: 0.5;
}

.error-title {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 12px;
}

.error-message {
  color: var(--text-secondary);
  font-size: 16px;
  margin-bottom: 40px;
  line-height: 1.7;
}

.error-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* === Footer === */
.footer {
  padding: 40px;
  text-align: center;
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--border);
}

.footer p {
  color: var(--text-muted);
  font-size: 13px;
}

/* === Animations === */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.animate-in {
  animation: fadeInUp 0.8s ease-out forwards;
}

.stagger-1 { animation-delay: 0.1s; opacity: 0; }
.stagger-2 { animation-delay: 0.2s; opacity: 0; }
.stagger-3 { animation-delay: 0.3s; opacity: 0; }
.stagger-4 { animation-delay: 0.4s; opacity: 0; }

/* === Scroll Reveal === */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* === Responsive === */
@media (max-width: 768px) {
  .navbar {
    padding: 12px 20px;
  }
  
  .navbar.scrolled {
    padding: 10px 20px;
  }
  
  .brand-text {
    font-size: 16px;
  }
  
  .nav-link {
    padding: 8px 14px;
    font-size: 13px;
  }
  
  .hero-section {
    padding-top: 100px;
  }
  
  .features-section,
  .pricing-section,
  .testimonials-section,
  .cta-section {
    padding-left: 20px;
    padding-right: 20px;
  }
  
  .features-grid,
  .pricing-grid,
  .testimonials-grid {
    grid-template-columns: 1fr;
  }
  
  .stats-row {
    flex-direction: column;
    align-items: center;
    gap: 16px;
  }
  
  .stat-card {
    padding: 24px 32px;
    min-width: auto;
    width: 100%;
    max-width: 280px;
  }
  
  .hero-actions {
    flex-direction: column;
    align-items: center;
  }
  
  .hero-actions .btn {
    width: 100%;
    max-width: 300px;
  }
  
  .download-card {
    padding: 32px 24px;
  }
  
  .download-info {
    grid-template-columns: 1fr;
  }
  
  .cta-card {
    padding: 40px 24px;
  }
  
  .error-actions {
    flex-direction: column;
    align-items: center;
  }
  
  .error-actions .btn {
    width: 100%;
    max-width: 260px;
  }

  .hero-visual {
    width: 200px;
    height: 200px;
  }
  
  .shield {
    width: 80px;
    height: 100px;
  }
  
  .shield-ring:nth-child(2) { width: 140px; height: 140px; }
  .shield-ring:nth-child(3) { width: 170px; height: 170px; }
  .shield-ring:nth-child(4) { width: 200px; height: 200px; }
}