/* ========================================
   Khlangfile Landing Page - Global Styles
   ======================================== */

:root {
  --primary: #2ECC71;
  --primary-dark: #27AE60;
  --secondary: #1a2332;
  --accent: #3498DB;
  --text: #333;
  --text-light: #666;
  --bg: #ffffff;
  --bg-light: #f8f9fa;
  --border: #e0e0e0;
  --shadow: 0 4px 20px rgba(0,0,0,0.08);
  --radius: 12px;
  --transition: all 0.3s ease;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'Noto Sans Thai', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: var(--text);
  line-height: 1.7;
  background: var(--bg);
}

a { text-decoration: none; color: var(--primary); transition: var(--transition); }
a:hover { color: var(--primary-dark); }

img { max-width: 100%; height: auto; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* ========== Navbar ========== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(26, 35, 50, 0.95);
  backdrop-filter: blur(10px);
  padding: 15px 0;
  box-shadow: 0 2px 20px rgba(0,0,0,0.1);
}

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

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.navbar-brand img {
  height: 40px;
  width: auto;
  border-radius: 8px;
}

.navbar-brand span {
  font-size: 22px;
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.5px;
}

.navbar-nav {
  display: flex;
  list-style: none;
  gap: 30px;
  align-items: center;
}

.navbar-nav a {
  color: #ccc;
  font-weight: 500;
  font-size: 15px;
  transition: var(--transition);
}

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

.navbar-nav .btn-register {
  background: var(--primary);
  color: #fff;
  padding: 10px 24px;
  border-radius: 25px;
  font-weight: 600;
}

.navbar-nav .btn-register:hover {
  background: var(--primary-dark);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(46,204,113,0.3);
}

.navbar-toggle {
  display: none;
  background: none;
  border: none;
  color: #fff;
  font-size: 24px;
  cursor: pointer;
}

/* ========== Hero / Slideshow ========== */
.hero {
  margin-top: 70px;
  position: relative;
  overflow: hidden;
  background: var(--secondary);
}

.slideshow {
  position: relative;
  height: 500px;
}

.slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  transition: opacity 1s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--secondary) 0%, #2c3e50 100%);
}

.slide.active { opacity: 1; }

.slide-content {
  text-align: center;
  color: #fff;
  padding: 40px;
  max-width: 700px;
}

.slide-content h2 {
  font-size: 36px;
  margin-bottom: 15px;
  font-weight: 700;
}

.slide-content p {
  font-size: 18px;
  opacity: 0.9;
  margin-bottom: 25px;
}

.slide-content .btn {
  display: inline-block;
  background: var(--primary);
  color: #fff;
  padding: 14px 32px;
  border-radius: 30px;
  font-weight: 600;
  font-size: 16px;
  transition: var(--transition);
}

.slide-content .btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(46,204,113,0.4);
  color: #fff;
}

.slide-dots {
  position: absolute;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 10px;
}

.slide-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: rgba(255,255,255,0.4);
  cursor: pointer;
  transition: var(--transition);
}

.slide-dot.active { background: var(--primary); transform: scale(1.2); }

/* ========== Sections ========== */
.section {
  padding: 80px 0;
}

.section-dark { background: var(--bg-light); }

.section-title {
  text-align: center;
  margin-bottom: 50px;
}

.section-title h2 {
  font-size: 32px;
  font-weight: 700;
  color: var(--secondary);
  margin-bottom: 10px;
}

.section-title p {
  font-size: 16px;
  color: var(--text-light);
}

/* ========== Feature Cards ========== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.feature-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 40px 30px;
  text-align: center;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 40px rgba(0,0,0,0.12);
}

.feature-card .icon { font-size: 48px; margin-bottom: 20px; }
.feature-card h3 { font-size: 20px; margin-bottom: 12px; color: var(--secondary); }
.feature-card p { font-size: 14px; color: var(--text-light); }

/* ========== Pricing Table ========== */
.pricing-table {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.pricing-table th, .pricing-table td {
  padding: 16px 24px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.pricing-table th {
  background: var(--secondary);
  color: #fff;
  font-weight: 600;
}

.pricing-table tr:last-child td { border-bottom: none; }
.pricing-table tr:hover td { background: #f0fdf4; }

/* ========== How To ========== */
.howto-list {
  max-width: 800px;
  margin: 0 auto;
}

.howto-item {
  background: #fff;
  border-radius: var(--radius);
  padding: 25px 30px;
  margin-bottom: 15px;
  box-shadow: var(--shadow);
  display: flex;
  gap: 20px;
  align-items: flex-start;
}

.howto-item .category {
  background: var(--primary);
  color: #fff;
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  white-space: nowrap;
}

.howto-item .commands { flex: 1; }
.howto-item .commands li {
  list-style: none;
  padding: 5px 0;
  font-size: 14px;
  color: var(--text);
}

.howto-item .commands code {
  background: #f0f0f0;
  padding: 2px 8px;
  border-radius: 4px;
  font-family: monospace;
  font-size: 13px;
}

/* ========== Register / QR ========== */
.register-section {
  text-align: center;
  padding: 60px 0;
}

.qr-container {
  background: #fff;
  display: inline-block;
  padding: 30px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  margin: 30px 0;
}

.qr-container img {
  width: 250px;
  height: 250px;
}

.register-steps {
  max-width: 600px;
  margin: 30px auto 0;
  text-align: left;
}

.register-steps li {
  padding: 10px 0;
  font-size: 16px;
  list-style: none;
  counter-increment: step;
}

.register-steps li::before {
  content: counter(step);
  background: var(--primary);
  color: #fff;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 14px;
  margin-right: 12px;
}

/* ========== Footer ========== */
.footer {
  background: var(--secondary);
  color: #aaa;
  padding: 40px 0;
  text-align: center;
  font-size: 14px;
}

.footer-links {
  margin-bottom: 15px;
}

.footer-links a {
  color: #ccc;
  margin: 0 15px;
}

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

/* ========== Legal Pages ========== */
.legal-content {
  max-width: 800px;
  margin: 100px auto 60px;
  padding: 40px;
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.legal-content h1 { font-size: 28px; margin-bottom: 20px; color: var(--secondary); }
.legal-content h2 { font-size: 20px; margin-top: 30px; margin-bottom: 15px; color: var(--secondary); }
.legal-content p, .legal-content li { margin-bottom: 10px; font-size: 15px; line-height: 1.8; }
.legal-content ol, .legal-content ul { padding-left: 25px; }
.legal-content table { width: 100%; border-collapse: collapse; margin: 15px 0; font-size: 14px; }
.legal-content table th, .legal-content table td { padding: 10px; border: 1px solid var(--border); text-align: left; }
.legal-content table th { background: var(--bg-light); }

/* ========== Responsive ========== */
@media (max-width: 768px) {
  .navbar-nav { display: none; flex-direction: column; position: absolute; top: 70px; left: 0; right: 0; background: var(--secondary); padding: 20px; gap: 15px; }
  .navbar-nav.active { display: flex; }
  .navbar-toggle { display: block; }
  .features-grid { grid-template-columns: 1fr; }
  .slideshow { height: 400px; }
  .slide-content h2 { font-size: 24px; }
  .slide-content p { font-size: 15px; }
  .howto-item { flex-direction: column; }
}