/* LVTField Landing Page — Author: Lộc Vũ Trung */
:root {
  --primary: #1B5E20;
  --primary-light: #2E7D32;
  --primary-dark: #0D3311;
  --accent: #4CAF50;
  --accent-glow: rgba(76, 175, 80, 0.3);
  --bg-dark: #0a0f0a;
  --bg-card: #111a11;
  --bg-glass: rgba(27, 94, 32, 0.08);
  --text-primary: #E8F5E9;
  --text-secondary: #A5D6A7;
  --text-muted: #6B8E6E;
  --border: rgba(76, 175, 80, 0.15);
  --radius: 16px;
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

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

body {
  font-family: 'Inter', -apple-system, sans-serif;
  background: var(--bg-dark);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
}

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

/* Navbar */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(10, 15, 10, 0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 16px 0;
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.4rem;
  font-weight: 700;
}

.logo-icon { font-size: 1.8rem; }
.logo-text { background: linear-gradient(135deg, var(--accent), #81C784); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }

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

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: color 0.3s;
}

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

.lang-switcher {
  display: flex;
  gap: 6px;
}

.lang-btn {
  background: rgba(255, 255, 255, 0.15);
  color: #ffffff;
  border: 1.5px solid rgba(255, 255, 255, 0.35);
  border-radius: 10px;
  padding: 6px 12px;
  font-size: 1.35rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s;
  opacity: 1;
  filter: brightness(1.2) saturate(1.3);
}

.lang-btn.active {
  opacity: 1;
  color: #69f0ae;
  border-color: var(--accent);
  background: rgba(76, 175, 80, 0.25);
  box-shadow: 0 0 8px rgba(76, 175, 80, 0.4);
  filter: brightness(1.3) saturate(1.5);
}

.lang-btn:hover { background: rgba(255, 255, 255, 0.25); box-shadow: 0 0 6px rgba(255, 255, 255, 0.2); }

/* Hero */
.hero {
  padding: 140px 0 80px;
  background: radial-gradient(ellipse at 50% 0%, rgba(76, 175, 80, 0.08) 0%, transparent 70%);
  position: relative;
}

.hero::before {
  content: '';
  position: absolute;
  top: 100px;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 60%);
  opacity: 0.3;
  pointer-events: none;
}

.hero-content {
  position: relative;
  text-align: center;
}

.hero-text h1 {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 24px;
  background: linear-gradient(135deg, #fff 30%, var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  font-size: 1.2rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 40px;
  line-height: 1.8;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin-bottom: 60px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 32px;
  border-radius: 12px;
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s ease;
  border: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-light), var(--accent));
  color: white;
  box-shadow: 0 4px 20px rgba(76, 175, 80, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(76, 175, 80, 0.5);
}

/* Stats */
.hero-stats {
  display: flex;
  gap: 60px;
  justify-content: center;
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--accent);
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* Sections */
.section-title {
  font-size: 2rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 50px;
  background: linear-gradient(135deg, #fff 40%, var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Features */
.features {
  padding: 100px 0;
}

.features-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

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

.feature-column::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), transparent);
}

.column-qgis::before {
  background: linear-gradient(90deg, #2196F3, transparent);
}

.column-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 28px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
}

.column-icon {
  font-size: 2rem;
}

.column-header h3 {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-primary);
  flex: 1;
}

.column-badge {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 4px 12px;
  border-radius: 20px;
  background: rgba(76, 175, 80, 0.15);
  color: var(--accent);
  border: 1px solid rgba(76, 175, 80, 0.3);
}

.badge-qgis {
  background: rgba(33, 150, 243, 0.15);
  color: #64B5F6;
  border-color: rgba(33, 150, 243, 0.3);
}

.feature-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.feature-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 14px 16px;
  border-radius: 12px;
  transition: all 0.3s;
  border: 1px solid transparent;
}

.feature-item:hover {
  background: rgba(76, 175, 80, 0.08);
  border-color: rgba(76, 175, 80, 0.15);
}

.column-qgis .feature-item:hover {
  background: rgba(33, 150, 243, 0.08);
  border-color: rgba(33, 150, 243, 0.15);
}

.fi-icon {
  font-size: 1.8rem;
  flex-shrink: 0;
  margin-top: 2px;
  filter: saturate(1.4) brightness(1.1);
}

.feature-item strong {
  display: block;
  font-size: 1.05rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 4px;
  letter-spacing: 0.2px;
}

.feature-item p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin: 0;
}

/* Countries */
.countries {
  padding: 80px 0;
  background: var(--bg-glass);
}

.countries-grid {
  display: flex;
  gap: 24px;
  justify-content: center;
}

.country-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 48px;
  transition: all 0.3s;
}

.country-card:hover {
  border-color: var(--accent);
  transform: scale(1.02);
}

.country-flag { font-size: 3rem; }
.country-name { font-size: 1.1rem; font-weight: 600; }
.country-detail { font-size: 0.8rem; color: var(--text-muted); }

/* Download */
.download {
  padding: 100px 0;
  text-align: center;
}

.download-desc {
  color: var(--text-secondary);
  margin-bottom: 40px;
  font-size: 1.1rem;
}

.btn-download {
  display: inline-flex;
  align-items: center;
  gap: 16px;
  background: var(--bg-card);
  border: 2px solid var(--accent);
  color: var(--text-primary);
  padding: 20px 40px;
  border-radius: var(--radius);
  text-decoration: none;
  font-size: 1rem;
  transition: all 0.3s;
}

.btn-download:hover {
  background: rgba(76, 175, 80, 0.1);
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(76, 175, 80, 0.2);
}

.btn-download .btn-icon { font-size: 2rem; }
.btn-download small { display: block; font-size: 0.8rem; color: var(--text-muted); }
.btn-download strong { font-size: 1.2rem; }

.btn-download-qgis {
  border-color: #2196F3;
}

.btn-download-qgis:hover {
  background: rgba(33, 150, 243, 0.1);
  box-shadow: 0 8px 30px rgba(33, 150, 243, 0.2);
}

.download-buttons {
  display: flex;
  gap: 20px;
  justify-content: center;
  flex-wrap: wrap;
}

.download-version {
  margin-top: 16px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.btn-download-ios {
  border-color: #9E9E9E;
}

.btn-download-ios:hover {
  background: rgba(158, 158, 158, 0.1);
  box-shadow: 0 8px 30px rgba(158, 158, 158, 0.2);
}

.download-ios-note {
  margin-top: 16px;
  font-size: 0.85rem;
  color: #FF9800;
  font-style: italic;
}

/* Footer */
.footer {
  border-top: 1px solid var(--border);
  padding: 40px 0;
}

.footer-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
}

.footer-copy {
  color: var(--text-muted);
  font-size: 0.85rem;
}

.footer-links {
  display: flex;
  gap: 20px;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
}

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

/* Responsive */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .hero-text h1 { font-size: 2.2rem; }
  .hero-desc { font-size: 1rem; }
  .hero-stats { gap: 30px; }
  .stat-number { font-size: 1.8rem; }
  .features-columns { grid-template-columns: 1fr; }
  .countries-grid { flex-direction: column; align-items: center; }
  .footer-content { flex-direction: column; gap: 16px; text-align: center; }
  .hero-buttons { flex-direction: column; align-items: center; }
}

/* Download Counter Badges */
.download-count {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent);
  margin-top: 4px;
  opacity: 0.9;
  letter-spacing: 0.3px;
}

.btn-download-qgis .download-count {
  color: #64B5F6;
}

.btn-download-ios .download-count {
  color: #BDBDBD;
}

/* Counter animation */
@keyframes countUp {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.download-count.loaded {
  animation: countUp 0.5s ease-out;
}

/* Install Guide Link */
.install-guide-link {
  margin-top: 20px;
  margin-bottom: 8px;
}

.guide-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: #81C784;
  text-decoration: none;
  font-weight: 600;
  font-size: 1rem;
  padding: 10px 24px;
  border: 1px solid rgba(76, 175, 80, 0.3);
  border-radius: 10px;
  background: rgba(76, 175, 80, 0.08);
  transition: all 0.3s;
}

.guide-link:hover {
  background: rgba(76, 175, 80, 0.18);
  border-color: var(--accent);
  transform: translateY(-1px);
}