/* ============================================
   Design System & Variables
   ============================================ */
:root {
  --color-primary: #3b82f6;
  --color-primary-dark: #2563eb;
  --color-primary-light: #60a5fa;
  --color-accent: #8b5cf6;
  --color-bg: #0f172a;
  --color-bg-light: #1e293b;
  --color-surface: #ffffff;
  --color-surface-alt: #f8fafc;
  --color-text: #1e293b;
  --color-text-soft: #475569;
  --color-text-muted: #94a3b8;
  --color-border: #e2e8f0;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 20px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.12);
  --shadow-glow: 0 0 60px rgba(59,130,246,0.15);
  --font-sans: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-surface);
  line-height: 1.7;
}

::selection {
  background: rgba(59, 130, 246, 0.2);
  color: var(--color-text);
}

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

a:hover {
  color: var(--color-primary-dark);
}

img {
  max-width: 100%;
  display: block;
}

/* ============================================
   Navbar
   ============================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(226, 232, 240, 0.6);
  transition: all var(--transition);
}

.navbar.scrolled {
  background: rgba(255, 255, 255, 0.95);
  box-shadow: var(--shadow-sm);
}

.nav-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 2rem;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--color-text);
  font-weight: 600;
  font-size: 1.1rem;
}

.logo-icon {
  font-size: 1.5rem;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 2rem;
}

.nav-links a {
  color: var(--color-text-soft);
  font-size: 0.95rem;
  font-weight: 500;
  padding: 0.5rem 0;
  position: relative;
  transition: color var(--transition);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  border-radius: 1px;
  transition: width var(--transition);
}

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

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 6rem 2rem 4rem;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-gradient {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% 40%, rgba(59,130,246,0.08), transparent),
    radial-gradient(ellipse 60% 50% at 80% 20%, rgba(139,92,246,0.06), transparent),
    radial-gradient(ellipse 50% 40% at 20% 80%, rgba(59,130,246,0.04), transparent);
}

.hero-particles {
  position: absolute;
  inset: 0;
}

.particle {
  position: absolute;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-primary-light);
  opacity: 0.2;
  animation: float 8s ease-in-out infinite;
}

.particle:nth-child(1) { top: 20%; left: 10%; animation-delay: 0s; animation-duration: 8s; }
.particle:nth-child(2) { top: 60%; left: 80%; animation-delay: 2s; animation-duration: 10s; }
.particle:nth-child(3) { top: 40%; left: 50%; animation-delay: 4s; animation-duration: 7s; width: 4px; height: 4px; }
.particle:nth-child(4) { top: 80%; left: 30%; animation-delay: 1s; animation-duration: 9s; width: 8px; height: 8px; opacity: 0.1; }
.particle:nth-child(5) { top: 15%; left: 70%; animation-delay: 3s; animation-duration: 11s; }

@keyframes float {
  0%, 100% { transform: translate(0, 0); }
  25% { transform: translate(20px, -30px); }
  50% { transform: translate(-15px, 15px); }
  75% { transform: translate(25px, 10px); }
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 700px;
}

.hero-title {
  font-size: 3.2rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1.5rem;
  letter-spacing: -0.02em;
}

.hero-title-line {
  display: block;
}

.hero-title-line.accent {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--color-text-soft);
  font-weight: 400;
  margin-bottom: 1rem;
  letter-spacing: 0.1em;
}

.hero-desc {
  font-size: 1.1rem;
  color: var(--color-text-muted);
  margin-bottom: 2.5rem;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
}

/* ============================================
   Buttons
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  padding: 0.85rem 2rem;
  border-radius: 50px;
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  border: none;
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: #fff;
  box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 25px rgba(59, 130, 246, 0.4);
  color: #fff;
}

.btn-outline {
  background: transparent;
  color: var(--color-text);
  border: 1.5px solid var(--color-border);
}

.btn-outline:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: rgba(59, 130, 246, 0.04);
  transform: translateY(-2px);
}

/* ============================================
   Sections
   ============================================ */
.section {
  padding: 6rem 2rem;
}

.section-alt {
  background: var(--color-surface-alt);
}

.section-container {
  max-width: 1100px;
  margin: 0 auto;
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 1rem;
  letter-spacing: -0.01em;
}

.section-desc {
  font-size: 1.1rem;
  color: var(--color-text-soft);
  text-align: center;
  max-width: 650px;
  margin: 0 auto 3.5rem;
  line-height: 1.8;
}

/* ============================================
   Feature Cards
   ============================================ */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}

.feature-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2rem;
  text-align: center;
  transition: all var(--transition);
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

.feature-icon {
  font-size: 2.5rem;
  margin-bottom: 1.25rem;
}

.feature-card h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  color: var(--color-text);
}

.feature-card p {
  font-size: 0.95rem;
  color: var(--color-text-soft);
  line-height: 1.7;
}

/* ============================================
   Product Showcase
   ============================================ */
.product-showcase {
  display: flex;
  justify-content: center;
}

.product-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 3rem;
  max-width: 550px;
  width: 100%;
  position: relative;
  transition: all var(--transition);
}

.product-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.product-badge {
  display: inline-block;
  padding: 0.35rem 1rem;
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 600;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: #fff;
  margin-bottom: 1.5rem;
  letter-spacing: 0.05em;
}

.product-card h3 {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.product-card > p {
  color: var(--color-text-soft);
  line-height: 1.8;
  margin-bottom: 1.5rem;
}

.product-features {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.product-features li {
  font-size: 0.95rem;
  color: var(--color-text-soft);
  padding: 0.5rem 0;
}

/* ============================================
   Contact Grid
   ============================================ */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
}

.contact-card {
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  text-align: center;
  transition: all var(--transition);
}

.contact-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.contact-icon {
  font-size: 2rem;
  margin-bottom: 1rem;
}

.contact-card h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  color: var(--color-text);
}

.contact-card p {
  font-size: 0.9rem;
  color: var(--color-text-soft);
  line-height: 1.6;
}

/* ============================================
   Footer
   ============================================ */
.footer {
  background: var(--color-bg);
  color: rgba(255, 255, 255, 0.7);
  padding: 3rem 2rem 2rem;
}

.footer-container {
  max-width: 1100px;
  margin: 0 auto;
}

.footer-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin-bottom: 2rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 600;
  font-size: 1.1rem;
  color: #fff;
}

.footer-brand .logo-icon {
  -webkit-text-fill-color: unset;
  background: none;
  color: var(--color-primary-light);
}

.footer-credit {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.4);
}

.footer-links {
  display: flex;
  gap: 1.5rem;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.9rem;
  transition: color var(--transition);
}

.footer-links a:hover {
  color: #fff;
}

.footer-copyright {
  text-align: center;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.35);
}

/* ============================================
   Fade-in Animations
   ============================================ */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================
   Page Header (Privacy page)
   ============================================ */
.page-header {
  background: linear-gradient(135deg, var(--color-bg) 0%, var(--color-bg-light) 100%);
  padding: 8rem 2rem 3rem;
  text-align: center;
}

.page-header h1 {
  font-size: 2.5rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 0.75rem;
}

.page-header-sub {
  font-size: 1.1rem;
  color: rgba(255, 255, 255, 0.5);
}

/* ============================================
   Privacy Policy Styles
   ============================================ */
.policy-wrapper {
  background: var(--color-surface-alt);
  padding: 3rem 1rem;
}

.policy-container {
  max-width: 900px;
  margin: 0 auto;
  background: var(--color-surface);
  padding: 3rem;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.update-date {
  display: inline-block;
  background: var(--color-surface-alt);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  color: var(--color-text-soft);
  margin-bottom: 2rem;
}

.policy-container > p {
  line-height: 1.8;
  color: var(--color-text-soft);
  margin-bottom: 1.5rem;
  text-align: justify;
  font-size: 1.05rem;
}

.policy-container section {
  margin-top: 2.5rem;
}

.policy-container h2 {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-text);
  border-bottom: 2px solid var(--color-primary);
  padding-bottom: 0.75rem;
  margin-bottom: 1.5rem;
  text-align: left;
}

.policy-container h3.subsection {
  font-size: 1.15rem;
  color: var(--color-text);
  margin-top: 1.5rem;
  margin-bottom: 1rem;
  padding: 0.75rem 1rem;
  padding-left: 1rem;
  border-left: 3px solid var(--color-primary);
  background: var(--color-surface-alt);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-weight: 500;
}

.policy-container p {
  line-height: 1.8;
  color: var(--color-text-soft);
  margin-bottom: 1.25rem;
  text-align: justify;
  font-size: 1.05rem;
}

.policy-container ul {
  padding-left: 1.75rem;
  margin-bottom: 2rem;
}

.policy-container li {
  margin-bottom: 0.75rem;
  line-height: 1.7;
  color: var(--color-text-soft);
  font-size: 1.05rem;
}

.policy-container strong {
  color: var(--color-text);
  font-weight: 600;
}

/* Table */
.table-wrapper {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: 2rem 0;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.policy-container table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  background: var(--color-surface);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.policy-container th,
.policy-container td {
  padding: 1rem 1.25rem;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.policy-container th {
  background: var(--color-surface-alt);
  font-weight: 600;
  color: var(--color-text);
  font-size: 0.95rem;
  white-space: nowrap;
}

.policy-container tr:last-child td {
  border-bottom: none;
}

.policy-container tr:hover {
  background: var(--color-surface-alt);
  transition: background-color 0.2s ease;
}

/* Contact info */
.contact-info {
  background: var(--color-surface-alt);
  padding: 2rem;
  border-radius: var(--radius-md);
  margin-top: 1.5rem;
  border: 1px solid var(--color-border);
}

.contact-info address {
  line-height: 1.8;
  margin-bottom: 1.5rem;
  color: var(--color-text-soft);
  font-style: normal;
}

.contact-info a {
  color: var(--color-primary);
  border-bottom: 1px solid transparent;
  transition: all var(--transition);
}

.contact-info a:hover {
  color: var(--color-primary-dark);
  border-bottom-color: var(--color-primary-dark);
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 768px) {
  .hero-title {
    font-size: 2.2rem;
  }

  .hero-subtitle {
    font-size: 1.1rem;
  }

  .hero-actions {
    flex-direction: column;
    align-items: center;
  }

  .section {
    padding: 4rem 1rem;
  }

  .section-title {
    font-size: 1.6rem;
  }

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

  .product-card {
    padding: 2rem;
  }

  .footer-content {
    flex-direction: column;
    text-align: center;
  }

  .policy-container {
    padding: 1.5rem;
    margin: 0 0.5rem;
  }

  .policy-container h2 {
    font-size: 1.3rem;
  }

  .policy-container th,
  .policy-container td {
    padding: 0.75rem;
    font-size: 0.9rem;
  }

  .page-header {
    padding: 7rem 1.5rem 2.5rem;
  }

  .page-header h1 {
    font-size: 2rem;
  }

  .contact-info {
    padding: 1.5rem;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.8rem;
  }

  .nav-container {
    padding: 0 1rem;
  }

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

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