/* ===== ARTILIGENT V2 — DESIGN SYSTEM ===== */

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

/* --- THEME TOKENS (Light Default) --- */
:root {
  --bg-primary: #f8fafc;
  --bg-secondary: #f1f5f9;
  --bg-card: #ffffff;
  --bg-nav: rgba(248,250,252,0.92);
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --border: #e2e8f0;
  --border-light: #f1f5f9;
  --bg-hover: rgba(15, 23, 42, 0.05);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 20px rgba(0,0,0,0.06);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.08);
  --shadow-card-hover: 0 12px 40px rgba(0,0,0,0.1);

  /* Brand */
  --brand-teal: #0d9488;
  --brand-teal-light: #82cecd;
  --brand-blue: #3977bb;
  --brand-indigo: #505ca9;
  --brand-magenta: #c856a1;

  /* Era gradients */
  --era1-from: #3977bb; --era1-to: #14b8a6;
  --era2-from: #3977bb; --era2-to: #505ca9;
  --era3-from: #505ca9; --era3-to: #c856a1;

  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --nav-height: 72px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --transition: 0.3s var(--ease);
}

/* --- DARK THEME --- */
[data-theme="dark"] {
  --bg-primary: #09090b;
  --bg-secondary: #0d1224;
  --bg-card: #18181b;
  --bg-nav: rgba(9,9,11,0.95);
  --text-primary: #f4f4f5;
  --text-secondary: rgba(244,244,245,0.8);
  --text-muted: rgba(244,244,245,0.45);
  --border: rgba(255,255,255,0.12);
  --border-light: rgba(255,255,255,0.06);
  --bg-hover: rgba(255, 255, 255, 0.1);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.2);
  --shadow-md: 0 4px 20px rgba(0,0,0,0.3);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.4);
  --shadow-card-hover: 0 12px 40px rgba(0,0,0,0.5);
  --brand-teal: #82cecd;
  --brand-teal-light: #a7dedd;
  --brand-blue: #6a9fd4;
  --brand-indigo: #7b8cdb;
  --brand-magenta: #d87ab8;
}

/* --- BASE --- */
html { scroll-behavior: smooth; }
body {
  font-family: 'IBM Plex Sans Thai', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
  transition: background var(--transition), color var(--transition);
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
button { font-family: inherit; cursor: pointer; }

.container {
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 0 clamp(16px, 4vw, 40px);
}

/* --- NAVIGATION --- */
.nav {
  position: fixed; top: 0; left: 0; right: 0;
  z-index: 1000;
  background: var(--bg-nav);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition), border var(--transition);
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
  padding: 0 clamp(16px, 4vw, 40px);
}

.nav-logo img { height: 28px; width: auto; }

.nav-menu {
  display: flex;
  align-items: center;
  gap: 0;
  list-style: none;
}

.nav-item { position: relative; }

.nav-link {
  display: flex; align-items: center; gap: 4px;
  padding: 24px 16px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: none; border: none;
  transition: color var(--transition);
}
.nav-link:hover { color: var(--text-primary); }
.nav-link .chevron {
  width: 14px; height: 14px;
  transition: transform 0.2s;
}
.nav-item.active .nav-link .chevron { transform: rotate(180deg); }

.nav-actions {
  display: flex; align-items: center; gap: 12px;
}

/* Theme Toggle */
.theme-toggle {
  width: 40px; height: 40px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--bg-card);
  display: flex; align-items: center; justify-content: center;
  transition: all var(--transition);
  color: var(--text-secondary);
  font-size: 1.1rem;
}
.theme-toggle:hover {
  border-color: var(--brand-teal);
  color: var(--brand-teal);
}

/* CTA Button */
.nav-cta {
  padding: 10px 22px;
  background: var(--text-primary);
  color: var(--bg-primary);
  font-weight: 600;
  font-size: 0.85rem;
  border-radius: var(--radius-sm);
  border: none;
  transition: all var(--transition);
}
.nav-cta:hover {
  opacity: 0.85;
  transform: translateY(-1px);
}

/* Mobile Toggle */
.nav-hamburger {
  display: none;
  background: none; border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  padding: 8px;
}

/* --- MEGA DROPDOWN --- */
.mega-dropdown {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  min-width: 720px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 32px;
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  opacity: 0;
  visibility: hidden;
  transform: translateX(-50%) translateY(8px);
  transition: all 0.25s var(--ease);
  pointer-events: none;
  z-index: 100;
}

.nav-item.active .mega-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
  pointer-events: auto;
}

.mega-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.mega-column {}

.mega-column-title {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 2px solid;
  display: flex; align-items: center; gap: 8px;
}
.mega-column-title.era1 { color: var(--brand-teal); border-color: var(--brand-teal); }
.mega-column-title.era2 { color: var(--brand-indigo); border-color: var(--brand-indigo); }
.mega-column-title.era3 { color: var(--brand-magenta); border-color: var(--brand-magenta); }

.mega-link {
  display: flex; align-items: center; gap: 10px;
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  color: var(--text-secondary);
  transition: all 0.2s;
}
.mega-link:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  transform: translateX(4px);
}
.mega-link i {
  width: 32px; height: 32px;
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  flex-shrink: 0;
}
.mega-link.era1 i { background: rgba(20,184,166,0.1); color: var(--brand-teal); }
.mega-link.era2 i { background: rgba(80,92,169,0.1); color: var(--brand-indigo); }
.mega-link.era3 i { background: rgba(200,86,161,0.1); color: var(--brand-magenta); }

.mega-footer {
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between;
}
.mega-footer-link {
  display: flex; align-items: center; gap: 8px;
  font-size: 0.85rem; font-weight: 600;
  color: var(--brand-teal);
  transition: opacity 0.2s;
}
.mega-footer-link:hover { opacity: 0.7; }

/* Small dropdown */
.dropdown-sm {
  position: absolute;
  top: 100%; left: 0;
  min-width: 240px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  padding: 8px;
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  opacity: 0; visibility: hidden;
  transform: translateY(8px);
  transition: all 0.25s var(--ease);
  pointer-events: none;
}
.nav-item.active .dropdown-sm {
  opacity: 1; visibility: visible;
  transform: translateY(0);
  pointer-events: auto;
}
.dropdown-sm a {
  display: block;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  color: var(--text-secondary);
  transition: all 0.2s;
}
.dropdown-sm a:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  transform: translateX(4px);
}

/* --- HERO SECTION --- */
.hero {
  min-height: 100dvh;
  display: flex;
  align-items: center;
  padding: calc(var(--nav-height) + 40px) 0 80px;
  position: relative;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(40px, 6vw, 80px);
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center; gap: 8px;
  padding: 6px 16px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 100px;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--brand-teal);
  margin-bottom: 24px;
}

.hero-title {
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.15;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.hero-title .gradient {
  background: linear-gradient(135deg, var(--era3-from), var(--era3-to));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 480px;
  margin-bottom: 32px;
  line-height: 1.7;
}

.hero-cta {
  display: flex; gap: 12px; flex-wrap: wrap;
}

.hero-visual {
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}
.hero-visual svg, .hero-visual img {
  max-width: 100%; height: auto;
}

/* --- BUTTONS --- */
.btn {
  display: inline-flex;
  align-items: center; gap: 8px;
  padding: 14px 28px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius);
  border: none;
  transition: all var(--transition);
  font-family: inherit;
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0) scale(0.98); }

.btn-primary {
  background: linear-gradient(135deg, var(--era3-from), var(--era3-to));
  color: #fff;
  box-shadow: 0 4px 16px rgba(200,86,161,0.2);
}
.btn-primary:hover { box-shadow: 0 8px 24px rgba(200,86,161,0.35); }

.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border: 1.5px solid var(--border);
}
.btn-secondary:hover {
  border-color: var(--brand-teal);
  color: var(--brand-teal);
}

.btn-sm { padding: 10px 20px; font-size: 0.85rem; }

/* --- SECTION COMMON --- */
.section {
  padding: clamp(64px, 10vh, 120px) 0;
  position: relative;
}

.section-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--brand-teal);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 600px;
  line-height: 1.7;
}

.section-header {
  text-align: center;
  margin-bottom: clamp(40px, 6vh, 64px);
}
.section-header .section-desc { margin: 0 auto; }

/* --- SOLUTION CARDS --- */
.solutions-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.solution-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: all 0.4s var(--ease);
  display: flex;
  flex-direction: column;
}
.solution-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-card-hover);
}

.solution-card-header {
  padding: 28px 28px 0;
  display: flex;
  align-items: center;
  gap: 14px;
}
.solution-card-era {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 1px;
  padding: 4px 10px;
  border-radius: 100px;
}
.solution-card-era.era1 { background: rgba(20,184,166,0.1); color: var(--brand-teal); }
.solution-card-era.era2 { background: rgba(80,92,169,0.1); color: var(--brand-indigo); }
.solution-card-era.era3 { background: rgba(200,86,161,0.1); color: var(--brand-magenta); }

.solution-card-body { padding: 20px 28px 28px; flex: 1; display: flex; flex-direction: column; }

.solution-card-title {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.solution-card-subtitle {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.solution-card-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  margin-bottom: 20px;
  line-height: 1.6;
  flex: 1;
}

.solution-card-services {
  list-style: none;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  display: flex; flex-direction: column; gap: 8px;
}
.solution-card-services li {
  display: flex; align-items: center; gap: 8px;
  font-size: 0.85rem;
  color: var(--text-secondary);
}
.solution-card-services li i { font-size: 0.9rem; }
.solution-card-services li.era1 i { color: var(--brand-teal); }
.solution-card-services li.era2 i { color: var(--brand-indigo); }
.solution-card-services li.era3 i { color: var(--brand-magenta); }

.solution-card-cta {
  display: inline-flex;
  align-items: center; gap: 6px;
  margin-top: 20px;
  font-size: 0.88rem;
  font-weight: 600;
  transition: gap 0.2s;
}
.solution-card-cta.era1 { color: var(--brand-teal); }
.solution-card-cta.era2 { color: var(--brand-indigo); }
.solution-card-cta.era3 { color: var(--brand-magenta); }
.solution-card-cta:hover { gap: 12px; }

/* Hover border glow per era */
.solution-card.era1-card:hover { border-color: var(--brand-teal); }
.solution-card.era2-card:hover { border-color: var(--brand-indigo); }
.solution-card.era3-card:hover { border-color: var(--brand-magenta); }

/* --- WHY US (PILLARS) --- */
.pillars-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 20px;
}

.pillar-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: all 0.3s var(--ease);
}
.pillar-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--brand-teal);
}
.pillar-card.featured {
  grid-row: 1 / 3;
  display: flex; flex-direction: column; justify-content: center;
}

.pillar-icon {
  width: 48px; height: 48px;
  border-radius: var(--radius);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 20px;
  background: rgba(20,184,166,0.08);
  color: var(--brand-teal);
}

.pillar-title {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.pillar-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.pillar-metric {
  font-family: 'JetBrains Mono', monospace;
  font-size: 2rem;
  font-weight: 700;
  color: var(--brand-teal);
  margin-bottom: 4px;
}

/* --- CUSTOMER REFERENCES --- */
.refs-section { background: var(--bg-secondary); }

.logo-marquee {
  position: relative;
  overflow: hidden;
  padding: 20px 0;
}
.logo-marquee::before,
.logo-marquee::after {
  content: '';
  position: absolute; top: 0; bottom: 0;
  width: 120px; z-index: 2;
}
.logo-marquee::before { left: 0; background: linear-gradient(to right, var(--bg-secondary), transparent); }
.logo-marquee::after { right: 0; background: linear-gradient(to left, var(--bg-secondary), transparent); }

.logo-track {
  display: flex;
  animation: marquee 25s linear infinite;
  width: max-content;
}
.logo-track img {
  height: 40px;
  margin: 0 40px;
  opacity: 0.5;
  filter: grayscale(50%);
  transition: all 0.3s;
}
.logo-track img:hover { opacity: 1; filter: grayscale(0%); }

@keyframes marquee {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

/* --- CTA SECTION --- */
.cta-section {
  background: linear-gradient(135deg, var(--era3-from), var(--era3-to));
  color: #fff;
  text-align: center;
  padding: clamp(64px, 10vh, 100px) 0;
}
.cta-section .section-title { color: #fff; }
.cta-section .section-desc { color: rgba(255,255,255,0.8); margin: 0 auto 32px; }

.cta-buttons { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

.btn-white {
  background: #fff;
  color: var(--era3-from);
  padding: 14px 28px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius);
  border: none;
  transition: all var(--transition);
  font-family: inherit;
}
.btn-white:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,0.15); }

.btn-outline-white {
  background: transparent;
  color: #fff;
  padding: 14px 28px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius);
  border: 1.5px solid rgba(255,255,255,0.4);
  transition: all var(--transition);
  font-family: inherit;
}
.btn-outline-white:hover { border-color: #fff; background: rgba(255,255,255,0.1); }

/* --- FOOTER --- */
.footer {
  background: var(--bg-primary);
  border-top: 1px solid var(--border);
  padding: 64px 0 32px;
  transition: background var(--transition), border var(--transition);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 48px;
}

.footer-brand p {
  color: var(--text-muted);
  font-size: 0.88rem;
  margin-top: 16px;
  line-height: 1.6;
  max-width: 280px;
}

.footer-col-title {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.footer-links {
  display: flex; flex-direction: column; gap: 10px;
}
.footer-links a {
  font-size: 0.88rem;
  color: var(--text-secondary);
  transition: color 0.2s;
}
.footer-links a:hover { color: var(--brand-teal); }

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap; gap: 12px;
}
.footer-copy {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* --- REVEAL ANIMATION --- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: all 0.7s var(--ease);
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }

/* --- RESPONSIVE --- */
@media (max-width: 1024px) {
  .hero-grid { grid-template-columns: 1fr; text-align: center; }
  .hero-desc { margin: 0 auto 32px; }
  .hero-cta { justify-content: center; }
  .hero-visual { display: none; }
  .solutions-grid { grid-template-columns: repeat(2, 1fr); }
  .pillars-grid { grid-template-columns: 1fr 1fr; }
  .pillar-card.featured { grid-row: auto; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .mega-dropdown { min-width: 600px; }
}

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

  /* Mobile menu overlay */
  .nav-menu.active {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: var(--nav-height);
    left: 0; right: 0; height: calc(100vh - var(--nav-height));
    background: var(--bg-primary);
    padding: 24px;
    gap: 0;
    overflow-y: auto;
    z-index: 999;
  }
  .nav-menu.active .nav-item {
    width: 100%;
  }
  .nav-menu.active .nav-link {
    padding: 16px 0;
    font-size: 1.1rem;
    border-bottom: 1px solid var(--border);
    width: 100%;
    justify-content: space-between;
  }
  .nav-menu.active .mega-dropdown,
  .nav-menu.active .dropdown-sm {
    position: static;
    transform: none;
    min-width: 100%;
    border: none;
    box-shadow: none;
    padding: 20px 0 24px 8px;
    background: transparent;
    opacity: 1; visibility: visible;
    pointer-events: auto;
    display: none;
  }
  .nav-menu.active .nav-item.active .mega-dropdown,
  .nav-menu.active .nav-item.active .dropdown-sm {
    display: block;
  }
  .nav-menu.active .mega-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .nav-menu.active .mega-footer {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
    padding-top: 24px;
  }
  .nav-menu.active .mega-link {
    padding: 10px 0;
  }

  .solutions-grid { grid-template-columns: 1fr; }
  .pillars-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; text-align: center; }
}