:root {
  --color-base: #f8faf9;
  --color-surface: #ffffff;
  --color-primary: #10b981;
  --color-primary-hover: #059669;
  --color-primary-light: #d1fae5;
  --color-dark: #0f172a;
  --color-text-main: #334155;
  --color-text-muted: #64748b;
  --color-border: #e2e8f0;
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  
  --radius-md: 12px;
  --radius-lg: 24px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: var(--color-base);
  color: var(--color-text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

ul {
  list-style: none;
}

/* Animations */
@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes float {
  0% { transform: translateY(0px); }
  50% { transform: translateY(-10px); }
  100% { transform: translateY(0px); }
}

/* Layout */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

section {
  padding: 100px 0;
}

.section-title {
  text-align: center;
  font-size: 36px;
  color: var(--color-dark);
  margin-bottom: 16px;
  font-weight: 700;
}

.section-subtitle {
  text-align: center;
  font-size: 18px;
  color: var(--color-text-muted);
  margin-bottom: 64px;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

/* Navbar */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 70px;
  background-color: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  display: flex;
  align-items: center;
  transition: all 0.3s ease;
}

.nav-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 20px;
  font-weight: 700;
  color: var(--color-dark);
}

.nav-menu {
  display: flex;
  gap: 32px;
}

.nav-link {
  font-size: 15px;
  color: var(--color-text-muted);
  font-weight: 500;
  transition: color 0.2s ease;
  position: relative;
}

.nav-link:hover, .nav-link.active {
  color: var(--color-primary);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -24px;
  left: 0;
  width: 100%;
  height: 3px;
  background-color: var(--color-primary);
  border-radius: 3px 3px 0 0;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  border: none;
}

.btn-primary {
  background-color: var(--color-primary);
  color: #fff;
  box-shadow: 0 4px 14px rgba(16, 185, 129, 0.3);
}

.btn-primary:hover {
  background-color: var(--color-primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(16, 185, 129, 0.4);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn-outline:hover {
  background-color: var(--color-primary-light);
}

.btn-lg {
  padding: 16px 36px;
  font-size: 18px;
}

/* Hero Section */
.hero {
  padding: 160px 0 80px;
  background: radial-gradient(circle at top right, var(--color-primary-light) 0%, var(--color-base) 40%);
  text-align: center;
}

.hero-tag {
  display: inline-block;
  padding: 6px 16px;
  background-color: rgba(16, 185, 129, 0.1);
  color: var(--color-primary-hover);
  border-radius: 20px;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 24px;
}

.hero h1 {
  font-size: 56px;
  line-height: 1.2;
  color: var(--color-dark);
  margin-bottom: 24px;
  font-weight: 800;
}

.hero p {
  font-size: 20px;
  color: var(--color-text-muted);
  max-width: 800px;
  margin: 0 auto 40px;
}

.hero-actions {
  display: flex;
  gap: 20px;
  justify-content: center;
  margin-bottom: 60px;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 60px;
  padding-top: 40px;
  border-top: 1px solid var(--color-border);
  max-width: 900px;
  margin: 0 auto;
}

.stat-item {
  text-align: center;
}

.stat-num {
  font-size: 32px;
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: 4px;
}

.stat-desc {
  font-size: 14px;
  color: var(--color-text-muted);
}

/* Features Section */
.features {
  background-color: var(--color-surface);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  margin-bottom: 80px;
}

.feature-card {
  background-color: var(--color-base);
  padding: 40px 30px;
  border-radius: var(--radius-lg);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  border: 1px solid var(--color-border);
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary-light);
}

.feature-icon {
  width: 60px;
  height: 60px;
  border-radius: 16px;
  background-color: var(--color-primary-light);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
}

.feature-icon svg {
  width: 32px;
  height: 32px;
}

.feature-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 12px;
}

.feature-desc {
  color: var(--color-text-muted);
  font-size: 15px;
}

.deep-dive {
  display: flex;
  align-items: center;
  gap: 60px;
  margin-top: 100px;
}

.deep-dive.reverse {
  flex-direction: row-reverse;
}

.deep-dive-content {
  flex: 1;
}

.deep-dive-content h3 {
  font-size: 32px;
  color: var(--color-dark);
  margin-bottom: 20px;
}

.deep-dive-content p {
  color: var(--color-text-muted);
  font-size: 16px;
  margin-bottom: 24px;
}

.deep-dive-visual {
  flex: 1;
  background: linear-gradient(135deg, var(--color-primary-light), #f0fdf4);
  border-radius: var(--radius-lg);
  padding: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.deep-dive-visual svg {
  width: 100%;
  max-width: 400px;
  height: auto;
  animation: float 6s ease-in-out infinite;
}

/* Platforms */
.platforms {
  background-color: var(--color-base);
}

.platform-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.platform-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 40px 30px;
  text-align: center;
  transition: all 0.3s ease;
}

.platform-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary);
}

.plat-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto 24px;
  color: var(--color-dark);
}

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

.platform-card h3 {
  font-size: 24px;
  margin-bottom: 12px;
}

.platform-card p {
  color: var(--color-text-muted);
  font-size: 14px;
  margin-bottom: 24px;
}

.plat-req {
  font-size: 13px;
  color: #94a3b8;
  margin-top: 16px;
  display: block;
}

/* Reviews */
.reviews {
  background-color: var(--color-surface);
}

.review-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.review-card {
  background-color: var(--color-base);
  padding: 32px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

.stars {
  color: #fbbf24;
  margin-bottom: 16px;
  display: flex;
  gap: 4px;
}

.stars svg {
  width: 20px;
  height: 20px;
}

.review-text {
  font-size: 15px;
  color: var(--color-text-main);
  margin-bottom: 24px;
  font-style: italic;
}

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

.reviewer-av {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: var(--color-primary-light);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  font-size: 18px;
}

.reviewer-info h4 {
  font-size: 16px;
  color: var(--color-dark);
}

.reviewer-info span {
  font-size: 13px;
  color: var(--color-text-muted);
}

/* Security */
.security {
  background-color: var(--color-dark);
  color: #fff;
}

.security .section-title {
  color: #fff;
}

.security .section-subtitle {
  color: #94a3b8;
}

.sec-badges {
  display: flex;
  justify-content: center;
  gap: 40px;
  margin-bottom: 80px;
}

.sec-badge {
  text-align: center;
  max-width: 200px;
}

.sec-badge svg {
  width: 48px;
  height: 48px;
  color: var(--color-primary);
  margin-bottom: 16px;
}

.sec-badge h4 {
  font-size: 18px;
  margin-bottom: 8px;
}

.sec-badge p {
  font-size: 14px;
  color: #cbd5e1;
}

.cmp-table {
  width: 100%;
  max-width: 900px;
  margin: 0 auto;
  border-collapse: collapse;
  background-color: #1e293b;
  border-radius: var(--radius-md);
  overflow: hidden;
}

.cmp-table th, .cmp-table td {
  padding: 20px;
  text-align: center;
  border-bottom: 1px solid #334155;
}

.cmp-table th {
  font-size: 18px;
  color: #fff;
  background-color: #0f172a;
}

.cmp-table th:first-child, .cmp-table td:first-child {
  text-align: left;
  padding-left: 30px;
}

.cmp-table tr:last-child td {
  border-bottom: none;
}

.cmp-icon-yes {
  color: var(--color-primary);
  width: 24px;
  height: 24px;
}

.cmp-icon-no {
  color: #ef4444;
  width: 24px;
  height: 24px;
}

/* Versions */
.versions {
  background-color: var(--color-surface);
}

.version-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  max-width: 1000px;
  margin: 0 auto;
}

.version-card {
  background-color: var(--color-base);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 40px;
  position: relative;
  transition: transform 0.3s ease;
}

.version-card:hover {
  transform: translateY(-10px);
}

.version-card.featured {
  border-color: var(--color-primary);
  box-shadow: 0 20px 25px -5px rgba(16, 185, 129, 0.1);
  background-color: #fff;
}

.v-tag {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--color-primary);
  color: #fff;
  padding: 4px 16px;
  border-radius: 20px;
  font-size: 14px;
  font-weight: bold;
}

.version-card h3 {
  font-size: 24px;
  color: var(--color-dark);
  margin-bottom: 16px;
}

.v-price {
  font-size: 40px;
  font-weight: 800;
  color: var(--color-dark);
  margin-bottom: 24px;
  display: flex;
  align-items: baseline;
}

.v-price span {
  font-size: 16px;
  font-weight: normal;
  color: var(--color-text-muted);
  margin-left: 8px;
}

.v-list {
  margin-bottom: 32px;
}

.v-list li {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
  font-size: 15px;
}

.v-list svg {
  width: 20px;
  height: 20px;
  color: var(--color-primary);
  flex-shrink: 0;
}

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

/* FAQ */
.faq {
  background-color: var(--color-base);
}

.faq-container {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 16px;
  overflow: hidden;
  transition: all 0.3s ease;
}

.faq-q {
  padding: 24px 30px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 18px;
  font-weight: 600;
  color: var(--color-dark);
  user-select: none;
}

.faq-q svg {
  width: 24px;
  height: 24px;
  color: var(--color-text-muted);
  transition: transform 0.3s ease;
}

.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.faq-a-inner {
  padding: 0 30px 24px;
  color: var(--color-text-muted);
  font-size: 16px;
  line-height: 1.7;
}

.faq-item.open {
  border-color: var(--color-primary-light);
  box-shadow: var(--shadow-sm);
}

.faq-item.open .faq-q {
  color: var(--color-primary);
}

.faq-item.open .faq-q svg {
  transform: rotate(180deg);
  color: var(--color-primary);
}

.faq-item.open .faq-a {
  max-height: 500px; /* arbitrary large value */
}

/* Footer */
.footer {
  background-color: var(--color-dark);
  padding: 40px 0;
  text-align: center;
  border-top: 1px solid #334155;
}

.footer-text {
  color: #94a3b8;
  font-size: 14px;
}

/* Responsive */
@media (max-width: 992px) {
  .feature-grid, .platform-grid, .review-grid, .version-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .deep-dive, .deep-dive.reverse {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    display: none;
  }
  .hero h1 {
    font-size: 40px;
  }
  .hero-stats {
    flex-direction: column;
    gap: 30px;
  }
  .sec-badges {
    flex-direction: column;
    align-items: center;
  }
}

@media (max-width: 576px) {
  .feature-grid, .platform-grid, .review-grid, .version-grid {
    grid-template-columns: 1fr;
  }
  .hero-actions {
    flex-direction: column;
  }
}