/* ============================================
   Pixal3D - Main Stylesheet
   ============================================ */

:root {
  --bg-primary: #0b0b12;
  --bg-secondary: #111118;
  --bg-card: #16161f;
  --bg-card-hover: #1c1c28;
  --border-color: #1e1e2e;
  --border-hover: #2e2e4a;
  --text-primary: #f1f1f7;
  --text-secondary: #9494b8;
  --text-muted: #6b6b8a;
  --accent-1: #6366f1;
  --accent-2: #8b5cf6;
  --accent-3: #a855f7;
  --accent-4: #d946ef;
  --gradient-bg: linear-gradient(135deg, #6366f1, #8b5cf6, #a855f7);
  --gradient-text: linear-gradient(135deg, #6366f1, #a855f7);
  --gradient-card: linear-gradient(180deg, rgba(99, 102, 241, 0.06), transparent);
  --glow-color: rgba(99, 102, 241, 0.15);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --max-width: 1200px;
}

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

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

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

/* ============================================
   Container
   ============================================ */

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ============================================
   Navigation / Header
   ============================================ */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(11, 11, 18, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo-link {
  display: flex;
  align-items: center;
  gap: 2px;
}

.logo-link img {
  height: 36px;
  width: auto;
  display: block;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.header-nav a {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color 0.2s ease;
}

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

.header-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 20px;
  font-size: 14px;
  font-weight: 600;
  color: #fff;
  background: var(--gradient-bg);
  border-radius: 100px;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.header-cta:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: 0.3s ease;
}

/* ============================================
   Hero Section
   ============================================ */

.hero {
  position: relative;
  padding: 100px 0 80px;
  text-align: center;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -40%;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, var(--glow-color) 0%, transparent 70%);
  pointer-events: none;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 16px;
  font-size: 13px;
  font-weight: 500;
  color: var(--accent-2);
  background: rgba(139, 92, 246, 0.1);
  border: 1px solid rgba(139, 92, 246, 0.2);
  border-radius: 100px;
  margin-bottom: 24px;
}

.hero h1 {
  font-size: clamp(42px, 7vw, 76px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -2px;
  margin-bottom: 20px;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  max-width: 640px;
  margin: 0 auto 36px;
  font-size: 18px;
  color: var(--text-secondary);
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  font-size: 15px;
  font-weight: 600;
  color: #fff;
  background: var(--gradient-bg);
  border: none;
  border-radius: 100px;
  cursor: pointer;
  transition: opacity 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
  box-shadow: 0 4px 24px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
  opacity: 0.95;
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(99, 102, 241, 0.4);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 100px;
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-2px);
}

.hero-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 48px;
  margin-top: 64px;
  padding-top: 40px;
  border-top: 1px solid var(--border-color);
}

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

.stat-number {
  font-size: 28px;
  font-weight: 700;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 2px;
}

/* ============================================
   Section Shared
   ============================================ */

.section {
  padding: 80px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 56px;
}

.section-header h2 {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  letter-spacing: -1px;
  margin-bottom: 12px;
}

.section-header p {
  max-width: 560px;
  margin: 0 auto;
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ============================================
   Features / Advantages
   ============================================ */

.features {
  background: var(--bg-secondary);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 20px;
}

.feature-card {
  padding: 32px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.feature-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-2px);
}

.feature-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: rgba(99, 102, 241, 0.1);
  margin-bottom: 16px;
  font-size: 20px;
}

.feature-card h3 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 8px;
  letter-spacing: -0.3px;
}

.feature-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ============================================
   Showcase / Gallery
   ============================================ */

.showcase-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 16px;
}

.showcase-item {
  position: relative;
  aspect-ratio: 1;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.showcase-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-card);
  font-size: 48px;
  opacity: 0.6;
}

.showcase-label {
  position: absolute;
  bottom: 12px;
  left: 12px;
  right: 12px;
  padding: 8px 12px;
  background: rgba(11, 11, 18, 0.8);
  backdrop-filter: blur(8px);
  border-radius: var(--radius-sm);
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
  text-align: center;
}

/* ============================================
   How It Works
   ============================================ */

.steps {
  background: var(--bg-secondary);
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.step-card {
  position: relative;
  padding: 32px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  transition: background 0.2s ease, border-color 0.2s ease;
}

.step-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--gradient-bg);
  color: #fff;
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 16px;
}

.step-card h3 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 8px;
}

.step-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ============================================
   FAQ
   ============================================ */

.faq-list {
  max-width: 720px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color 0.2s ease;
}

.faq-item:hover {
  border-color: var(--border-hover);
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  text-align: left;
  font-family: var(--font-sans);
  transition: color 0.2s ease;
}

.faq-question:hover {
  color: var(--accent-2);
}

.faq-icon {
  font-size: 18px;
  color: var(--text-muted);
  transition: transform 0.3s ease;
  flex-shrink: 0;
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  padding: 0 24px;
}

.faq-item.active .faq-answer {
  max-height: 300px;
  padding: 0 24px 20px;
}

.faq-answer p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ============================================
   Blog Section
   ============================================ */

.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}

.blog-card {
  padding: 28px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.blog-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-2px);
}

.blog-card .blog-tag {
  display: inline-block;
  padding: 4px 10px;
  font-size: 11px;
  font-weight: 600;
  color: var(--accent-2);
  background: rgba(139, 92, 246, 0.1);
  border-radius: 100px;
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.blog-card h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
  line-height: 1.4;
}

.blog-card p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 16px;
}

.blog-card .blog-link {
  font-size: 13px;
  font-weight: 600;
  color: var(--accent-1);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: gap 0.2s ease;
}

.blog-card .blog-link:hover {
  gap: 8px;
}

/* ============================================
   CTA Banner
   ============================================ */

.cta-banner {
  text-align: center;
  padding: 80px 0;
  position: relative;
}

.cta-banner::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--glow-color) 0%, transparent 70%);
  pointer-events: none;
}

.cta-banner h2 {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  letter-spacing: -1px;
  margin-bottom: 12px;
}

.cta-banner p {
  max-width: 520px;
  margin: 0 auto 32px;
  font-size: 16px;
  color: var(--text-secondary);
}

/* ============================================
   Footer
   ============================================ */

.site-footer {
  border-top: 1px solid var(--border-color);
  padding: 48px 0 32px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
  margin-top: 12px;
  max-width: 320px;
}

.footer-col h4 {
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.footer-col a {
  display: block;
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 10px;
  transition: color 0.2s ease;
}

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

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
  font-size: 13px;
  color: var(--text-muted);
}

/* ============================================
   Smooth Scrollbar
   ============================================ */

::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--border-hover);
}

/* ============================================
   Animations
   ============================================ */

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fadeInUp 0.6s ease forwards;
}

.fade-in-delay-1 { animation-delay: 0.1s; }
.fade-in-delay-2 { animation-delay: 0.2s; }
.fade-in-delay-3 { animation-delay: 0.3s; }

/* ============================================
   Responsive
   ============================================ */

@media (max-width: 900px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

  .footer-brand {
    grid-column: 1 / -1;
  }

  .hero-stats {
    gap: 24px;
    flex-wrap: wrap;
  }
}

@media (max-width: 768px) {
  .header-nav {
    display: none;
  }

  .header-nav.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: rgba(11, 11, 18, 0.98);
    backdrop-filter: blur(20px);
    padding: 24px;
    gap: 16px;
    border-bottom: 1px solid var(--border-color);
  }

  .header-nav.open a {
    font-size: 16px;
    padding: 8px 0;
  }

  .hamburger {
    display: flex;
  }

  .hero {
    padding: 60px 0 40px;
  }

  .hero-stats {
    flex-direction: column;
    gap: 16px;
    margin-top: 40px;
    padding-top: 24px;
  }

  .section {
    padding: 48px 0;
  }

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

  .showcase-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }

  .header-cta {
    display: none;
  }

  .header-nav.open .header-cta-mobile {
    display: inline-flex;
    justify-content: center;
    margin-top: 8px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
  }

  .btn-primary,
  .btn-secondary {
    width: 100%;
    justify-content: center;
  }

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