:root {
  --color-primary: #065f46; /* Emerald 800 */
  --color-primary-light: #10b981; /* Emerald 500 */
  --color-primary-dark: #064e3b; /* Emerald 900 */
  --color-accent: #f59e0b; /* Amber 500 */
  --color-bg: #f8fafc; /* Slate 50 */
  --color-surface: #ffffff;
  --color-text: #1e293b; /* Slate 800 */
  --color-text-muted: #64748b; /* Slate 500 */
  --color-border: #e2e8f0; /* Slate 200 */
  --radius-lg: 16px;
  --radius-md: 8px;
  --radius-sm: 4px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1);
  --transition: all 0.2s ease-in-out;
}

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

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
}

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

/* Navbar */
.navbar {
  background-color: var(--color-surface);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 2px solid var(--color-primary-light);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 70px;
}

.brand {
  display: flex;
  align-items: center;
  font-size: 24px;
  font-weight: 700;
  color: var(--color-primary-dark);
}

.brand svg {
  margin-right: 12px;
  fill: var(--color-primary-light);
}

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

.nav-item {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text-muted);
  position: relative;
  padding: 8px 0;
  transition: var(--transition);
}

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

.nav-item.active {
  color: var(--color-primary-dark);
}

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  border-radius: var(--radius-md);
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: var(--transition);
}

.btn-primary {
  background-color: var(--color-primary);
  color: #fff;
}

.btn-primary:hover {
  background-color: var(--color-primary-dark);
  box-shadow: var(--shadow-md);
}

.btn-accent {
  background-color: var(--color-accent);
  color: #fff;
}

.btn-accent:hover {
  background-color: #d97706;
  box-shadow: var(--shadow-md);
}

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

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

/* Typography & Layout Utilities */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 60px 24px;
}

.text-center { text-align: center; }
.mt-4 { margin-top: 16px; }
.mb-4 { margin-bottom: 16px; }
.mb-8 { margin-bottom: 32px; }
.section-title { font-size: 36px; font-weight: 800; color: var(--color-primary-dark); margin-bottom: 16px; }
.section-subtitle { font-size: 18px; color: var(--color-text-muted); margin-bottom: 48px; }

/* Heroes */
.hero {
  background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
  color: #fff;
  padding: 100px 24px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::after {
  content: '';
  position: absolute;
  top: -50%;
  right: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(16,185,129,0.2) 0%, transparent 70%);
  border-radius: 50%;
}

.hero h1 {
  font-size: 48px;
  font-weight: 800;
  margin-bottom: 24px;
  line-height: 1.2;
}

.hero p {
  font-size: 20px;
  opacity: 0.9;
  max-width: 700px;
  margin: 0 auto 40px;
}

.hero-actions {
  display: flex;
  gap: 20px;
  justify-content: center;
  position: relative;
  z-index: 10;
}

/* Feature Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 32px;
}

.feature-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-sm);
  border-top: 4px solid var(--color-primary-light);
  transition: var(--transition);
}

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

.feature-icon {
  width: 64px;
  height: 64px;
  background: #ecfdf5;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  color: var(--color-primary);
}

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

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

.faq-item {
  background: var(--color-surface);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.faq-question {
  padding: 24px;
  font-size: 18px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--color-primary-dark);
  transition: var(--transition);
}

.faq-question:hover {
  background: #f1f5f9;
}

.faq-icon {
  width: 24px;
  height: 24px;
  transition: transform 0.3s ease;
}

.faq-item.active .faq-icon {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  padding: 0 24px;
  transition: all 0.3s ease;
  color: var(--color-text-muted);
}

.faq-item.active .faq-answer {
  max-height: 500px;
  padding: 0 24px 24px 24px;
}

/* Downloads Layout */
.dl-platforms {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 32px;
  margin-top: 48px;
}

.dl-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  text-align: center;
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
}

.dl-card.highlight {
  border: 2px solid var(--color-primary);
  transform: scale(1.05);
  box-shadow: var(--shadow-lg);
}

.dl-card-icon {
  margin-bottom: 20px;
  color: var(--color-text);
}

/* SEO Article */
.article-content {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 48px;
  box-shadow: var(--shadow-sm);
  max-width: 900px;
  margin: 0 auto;
}

.article-content h2 {
  color: var(--color-primary-dark);
  margin: 32px 0 16px;
  font-size: 28px;
}

.article-content p {
  margin-bottom: 20px;
  font-size: 18px;
  color: #334155;
}

/* Footer */
.footer {
  background: var(--color-primary-dark);
  color: #e2e8f0;
  padding: 40px 24px;
  text-align: center;
}

.footer-security {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(16, 185, 129, 0.2);
  padding: 12px 24px;
  border-radius: 50px;
  color: #34d399;
  font-weight: 600;
  margin-bottom: 24px;
}

.footer-text {
  font-size: 14px;
  opacity: 0.7;
}

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