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

:root {
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --secondary: #8b5cf6;
  --accent: #3b82f6;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --bg-dark: #0f0f1a;
  --bg-darker: #0a0a12;
  --bg-card: #1a1a2e;
  --text-primary: #ffffff;
  --text-secondary: #a1a1aa;
  --border: #2a2a4a;
  --gradient-primary: linear-gradient(135deg, #6366f1, #8b5cf6);
  --gradient-hero: linear-gradient(135deg, #0f0f1a 0%, #1a1a2e 50%, #2d1b4e 100%);
  --shadow-glow: 0 0 60px rgba(99, 102, 241, 0.3);
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  background: var(--bg-dark);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: inherit;
}

/* Navigation */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(15, 15, 26, 0.95);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

.nav-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo-container {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-icon {
  width: 40px;
  height: 40px;
}

.logo-text {
  font-size: 22px;
  font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  gap: 32px;
  align-items: center;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
  transition: color 0.3s;
}

.nav-links a:hover {
  color: var(--primary);
}

.nav-button {
  padding: 10px 24px;
  background: var(--gradient-primary);
  color: white;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  transition: transform 0.2s, box-shadow 0.2s;
}

.nav-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(99, 102, 241, 0.4);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.lang-switch {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}

.lang-switch:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--primary);
  color: var(--text-primary);
}

.lang-icon {
  font-size: 16px;
}

.lang-text {
  font-weight: 600;
}

/* Hero Section */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 120px 48px 80px;
  background: var(--bg-darker);
  background-image:
    radial-gradient(circle at 20% 50%, rgba(99, 102, 241, 0.2) 0%, transparent 60%),
    radial-gradient(circle at 80% 20%, rgba(139, 92, 246, 0.2) 0%, transparent 60%),
    radial-gradient(circle at 40% 80%, rgba(59, 130, 246, 0.15) 0%, transparent 60%);
  position: relative;
  flex-direction: row;
  max-width: 1600px;
  margin: 0 auto;
  gap: 120px;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url("data:image/svg+xml,%3Csvg width='80' height='80' viewBox='0 0 80 80' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%236366f1' fill-opacity='0.05'%3E%3Cpath d='M40 8c-0.55 0-1 0.45-1 1v4c0 0.55 0.45 1 1 1s1-0.45 1-1V9c0-0.55-0.45-1-1-1zm0 58c-0.55 0-1 0.45-1 1v4c0 0.55 0.45 1 1 1s1-0.45 1-1v-4c0-0.55-0.45-1-1-1zM8 40c0-0.55-0.45-1-1-1H3c-0.55 0-1 0.45-1 1s0.45 1 1 1h4c0.55 0 1-0.45 1-1zm70 0c0-0.55-0.45-1-1-1h-4c-0.55 0-1 0.45-1 1s0.45 1 1 1h4c0.55 0 1-0.45 1-1zM16 16c-0.55 0-1 0.45-1 1v4c0 0.55 0.45 1 1 1s1-0.45 1-1v-4c0-0.55-0.45-1-1-1zm48 48c-0.55 0-1 0.45-1 1v4c0 0.55 0.45 1 1 1s1-0.45 1-1v-4c0-0.55-0.45-1-1-1z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  opacity: 0.8;
  z-index: 1;
}

.hero::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.03) 0%, transparent 70%);
  animation: pulse-glow 4s ease-in-out infinite;
  pointer-events: none;
}

@keyframes pulse-glow {
  0%, 100% { opacity: 0.5; transform: translate(-50%, -50%) scale(1); }
  50% { opacity: 0.8; transform: translate(-50%, -50%) scale(1.1); }
}

.hero-content {
  max-width: 550px;
  text-align: center;
  position: relative;
  z-index: 2;
  flex: 0 0 auto;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.3);
  border-radius: 20px;
  font-size: 13px;
  color: var(--success);
  font-weight: 500;
  margin-bottom: 24px;
}

.hero-title {
  font-size: 64px;
  font-weight: 800;
  letter-spacing: -2px;
  margin-bottom: 16px;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 28px;
  font-weight: 600;
  margin-bottom: 24px;
  color: var(--text-primary);
}

.hero-description {
  font-size: 18px;
  color: var(--text-secondary);
  margin-bottom: 32px;
  line-height: 1.8;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin-bottom: 32px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 12px;
  font-size: 16px;
  font-weight: 600;
  transition: transform 0.2s, box-shadow 0.2s;
  cursor: pointer;
}

.btn-primary {
  background: var(--gradient-primary);
  color: white;
  box-shadow: 0 8px 24px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(99, 102, 241, 0.4);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
}

.hero-tags {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid rgba(99, 102, 241, 0.3);
  border-radius: 8px;
  font-size: 13px;
  font-weight: 500;
  color: var(--primary);
}

.hero-visual {
  position: relative;
  width: 500px;
  height: 500px;
  opacity: 1;
  z-index: 2;
  flex: 0 0 auto;
}

.shield-icon {
  width: 100%;
  height: 100%;
  animation: float 6s ease-in-out infinite;
  filter: drop-shadow(0 0 80px rgba(99, 102, 241, 0.6))
          drop-shadow(0 0 120px rgba(139, 92, 246, 0.4));
}

.hero-visual::before {
  content: '';
  position: absolute;
  top: 10%;
  left: 10%;
  right: 10%;
  bottom: 10%;
  border: 1px solid rgba(99, 102, 241, 0.3);
  border-radius: 50%;
  animation: rotate-border 20s linear infinite;
}

.hero-visual::after {
  content: '';
  position: absolute;
  top: 15%;
  left: 15%;
  right: 15%;
  bottom: 15%;
  border: 1px dashed rgba(139, 92, 246, 0.4);
  border-radius: 50%;
  animation: rotate-border-reverse 25s linear infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-25px) rotate(3deg); }
}

@keyframes rotate-border {
  0% { transform: rotate(0deg); opacity: 0.5; }
  50% { opacity: 1; }
  100% { transform: rotate(360deg); opacity: 0.5; }
}

@keyframes rotate-border-reverse {
  0% { transform: rotate(360deg); opacity: 0.5; }
  50% { opacity: 1; }
  100% { transform: rotate(0deg); opacity: 0.5; }
}

/* Version Banner */
.version-banner {
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 16px 24px;
}

.banner-content {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
}

.version-label {
  background: var(--gradient-primary);
  padding: 4px 12px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 600;
  color: white;
}

.version-number {
  font-size: 14px;
  font-weight: 700;
  color: var(--primary);
}

.version-date {
  font-size: 14px;
  color: var(--text-secondary);
}

/* Sections */
section {
  padding: 100px 24px;
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 64px;
}

.section-badge {
  display: inline-block;
  padding: 6px 16px;
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid rgba(99, 102, 241, 0.3);
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 16px;
}

.section-title {
  font-size: 42px;
  font-weight: 700;
  letter-spacing: -1px;
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: 18px;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* Features Section */
.features {
  background: var(--bg-dark);
}

.features-grid {
  max-width: 1400px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 32px;
  transition: transform 0.3s, box-shadow 0.3s;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 48px rgba(99, 102, 241, 0.15);
  border-color: var(--primary);
}

.feature-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.feature-card h3 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 12px;
}

.feature-card > p {
  font-size: 15px;
  color: var(--text-secondary);
  margin-bottom: 20px;
  line-height: 1.7;
}

.feature-list {
  list-style: none;
  padding-left: 0;
}

.feature-list li {
  position: relative;
  padding-left: 24px;
  margin-bottom: 8px;
  font-size: 14px;
  color: var(--text-secondary);
}

.feature-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  width: 8px;
  height: 8px;
  background: var(--primary);
  border-radius: 50%;
}

/* Security Section */
.security {
  background: linear-gradient(135deg, #0f0f1a 0%, #1a1a2e 100%);
}

.security-content {
  max-width: 1400px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.security-features {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.security-item {
  display: flex;
  gap: 24px;
  align-items: flex-start;
}

.security-number {
  width: 56px;
  height: 56px;
  background: var(--gradient-primary);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  font-weight: 800;
  color: white;
  flex-shrink: 0;
}

.security-text h4 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 8px;
}

.security-text p {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.7;
}

.security-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.security-visual svg {
  width: 100%;
  max-width: 450px;
  height: auto;
}

/* Download Section */
.download {
  background: var(--bg-dark);
}

.download-content {
  max-width: 1200px;
  margin: 0 auto;
}

.download-header {
  text-align: center;
  margin-bottom: 48px;
}

.platform-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  margin-bottom: 32px;
}

.platform-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 32px 24px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  transition: transform 0.3s, border-color 0.3s, box-shadow 0.3s;
}

.platform-card:hover {
  transform: translateY(-4px);
  border-color: var(--primary);
  box-shadow: 0 16px 40px rgba(99, 102, 241, 0.15);
}

.platform-icon {
  width: 72px;
  height: 72px;
  margin-bottom: 8px;
}

.platform-icon svg {
  width: 100%;
  height: 100%;
}

.platform-card h3 {
  font-size: 20px;
  font-weight: 700;
}

.platform-card > p {
  font-size: 14px;
  color: var(--text-secondary);
}

.download-size {
  font-size: 12px;
  color: var(--primary);
  font-weight: 600;
}

.download-note {
  display: flex;
  gap: 16px;
  padding: 20px 24px;
  background: rgba(245, 158, 11, 0.1);
  border: 1px solid rgba(245, 158, 11, 0.3);
  border-radius: 12px;
  align-items: flex-start;
}

.download-note svg {
  flex-shrink: 0;
  margin-top: 2px;
}

.download-note p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* FAQ Section */
.faq {
  background: linear-gradient(135deg, #1a1a2e 0%, #0f0f1a 100%);
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  transition: border-color 0.3s;
}

.faq-item:hover {
  border-color: var(--primary);
}

.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  font-size: 18px;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary svg {
  color: var(--primary);
  transition: transform 0.3s;
}

.faq-item[open] summary svg {
  transform: rotate(45deg);
}

.faq-item p {
  padding: 0 24px 24px;
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* Footer */
.footer {
  background: var(--bg-darker);
  border-top: 1px solid var(--border);
  padding: 48px 24px;
}

.footer-content {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 32px;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.footer-logo {
  width: 48px;
  height: 48px;
}

.footer-brand span {
  font-size: 22px;
  font-weight: 700;
}

.footer-brand > p {
  font-size: 14px;
  color: var(--text-secondary);
}

.footer-links {
  display: flex;
  gap: 32px;
}

.footer-links a {
  font-size: 14px;
  color: var(--text-secondary);
  transition: color 0.3s;
}

.footer-links a:hover {
  color: var(--primary);
}

.footer-copy {
  text-align: center;
  font-size: 13px;
  color: var(--text-secondary);
}

.footer-copy p {
  margin-bottom: 4px;
}

/* Toast Notification */
.toast-container {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.toast {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
  font-size: 15px;
  font-weight: 500;
  min-width: 220px;
  animation: toast-in 0.3s ease-out;
  opacity: 0;
  transform: translateX(20px);
  animation-fill-mode: forwards;
}

.toast-info {
  border-color: var(--warning);
}

.toast-info .toast-icon {
  color: var(--warning);
}

.toast-success {
  border-color: var(--success);
}

.toast-success .toast-icon {
  color: var(--success);
}

.toast-toast-icon {
  flex-shrink: 0;
}

.toast-hide {
  animation: toast-out 0.3s ease-in forwards;
}

@keyframes toast-in {
  from {
    opacity: 0;
    transform: translateX(20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes toast-out {
  from {
    opacity: 1;
    transform: translateX(0);
  }
  to {
    opacity: 0;
    transform: translateX(20px);
  }
}

/* Responsive */
@media (max-width: 1200px) {
  .hero {
    gap: 60px;
    padding: 120px 32px 80px;
  }

  .hero-visual {
    width: 400px;
    height: 400px;
  }
}

@media (max-width: 1024px) {
  .hero {
    flex-direction: column;
    gap: 40px;
    padding: 100px 24px 60px;
  }

  .hero-visual {
    width: 320px;
    height: 320px;
  }

  .hero-title {
    font-size: 48px;
  }

  .hero-subtitle {
    font-size: 22px;
  }

  .security-content {
    grid-template-columns: 1fr;
  }

  .security-visual {
    order: -1;
  }

  .section-title {
    font-size: 36px;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .hero {
    padding: 100px 20px 60px;
    min-height: auto;
  }

  .hero::before {
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%236366f1' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  }

  .hero-visual {
    display: none;
  }

  .hero-title {
    font-size: 36px;
    letter-spacing: -1px;
  }

  .hero-subtitle {
    font-size: 18px;
  }

  .hero-description {
    font-size: 16px;
  }

  .hero-buttons {
    flex-direction: column;
  }

  .btn {
    width: 100%;
    justify-content: center;
  }

  .features-grid {
    grid-template-columns: 1fr;
  }

  section {
    padding: 60px 20px;
  }

  .footer-links {
    flex-direction: column;
    gap: 16px;
    align-items: center;
  }
}

@media (max-width: 480px) {
  .hero-tags {
    flex-direction: column;
    align-items: center;
  }

  .feature-card {
    padding: 24px;
  }

  .toast-container {
    left: 20px;
    right: 20px;
  }

  .toast {
    min-width: auto;
    width: 100%;
  }

  .faq-item summary {
    font-size: 16px;
    padding: 16px 20px;
  }
}