/* ============================================
   GigtoEV Official Website
   Design: Black & White + Electric Blue
   Inspired by: Tesla, Hyundai, LG Energy Solution
   ============================================ */

/* ---------- Reset & Base ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  font-weight: 400;
  line-height: 1.6;
  color: #ffffff;
  background: #0a0a0a;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img, svg, video { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; transition: color .2s ease; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
ul, ol { list-style: none; }

/* ---------- CSS Variables ---------- */
:root {
  --bg-black: #0a0a0a;
  --bg-dark: #111111;
  --bg-card: #161616;
  --bg-card-hover: #1c1c1c;
  --border: #232323;
  --border-light: #2d2d2d;
  --text-primary: #ffffff;
  --text-secondary: #b5b5b5;
  --text-muted: #7a7a7a;
  --accent: #00d4ff;
  --accent-dark: #0066ff;
  --accent-glow: rgba(0, 212, 255, .25);
  --max-width: 1280px;
  --nav-height: 72px;
  --section-pad: 120px;
  --radius: 12px;
  --radius-lg: 20px;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: var(--text-primary);
}
h1 { font-size: clamp(2.5rem, 6vw, 4.5rem); font-weight: 800; }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: clamp(1.5rem, 2.5vw, 2rem); }
h4 { font-size: 1.25rem; }
p { color: var(--text-secondary); font-size: 1rem; }
.eyebrow {
  display: inline-block;
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
}

/* ---------- Layout ---------- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}
section {
  padding: var(--section-pad) 0;
  position: relative;
}
.section-header {
  text-align: center;
  margin-bottom: 64px;
}
.section-header p {
  max-width: 640px;
  margin: 16px auto 0;
  font-size: 1.125rem;
}

/* ---------- Navigation ---------- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-height);
  background: rgba(10, 10, 10, 0.72);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
  transition: background .3s ease;
}
.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  height: 100%;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}
.nav-logo .logo-mark {
  width: 32px; height: 32px;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
  border-radius: 8px;
  display: grid;
  place-items: center;
  color: #000;
  font-weight: 900;
  font-size: 0.875rem;
}
.nav-menu {
  display: flex;
  align-items: center;
  gap: 32px;
}
.nav-menu a {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
}
.nav-menu a:hover, .nav-menu a.active { color: var(--text-primary); }
.nav-menu a.active::after {
  content: '';
  position: absolute;
  bottom: -8px; left: 0; right: 0;
  height: 2px;
  background: var(--accent);
}
.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 18px;
  background: var(--accent);
  color: #000 !important;
  border-radius: 999px;
  font-size: 0.875rem;
  font-weight: 600;
  transition: all .2s ease;
}
.nav-cta:hover { background: #ffffff; transform: translateY(-1px); }
.nav-toggle {
  display: none;
  width: 32px; height: 32px;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
}
.nav-toggle span {
  display: block;
  height: 2px;
  width: 22px;
  background: var(--text-primary);
  transition: all .3s ease;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 999px;
  font-size: 0.9375rem;
  font-weight: 600;
  transition: all .25s ease;
  border: 1px solid transparent;
  cursor: pointer;
}
.btn-primary {
  background: var(--accent);
  color: #000;
}
.btn-primary:hover {
  background: #ffffff;
  transform: translateY(-2px);
  box-shadow: 0 12px 30px var(--accent-glow);
}
.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border-color: var(--border-light);
}
.btn-secondary:hover {
  background: rgba(255, 255, 255, .05);
  border-color: var(--text-secondary);
}

/* ---------- Hero ---------- */
.hero {
  min-height: 100vh;
  padding-top: var(--nav-height);
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 70% 30%, rgba(0, 102, 255, .18), transparent 60%),
    radial-gradient(ellipse 60% 50% at 20% 80%, rgba(0, 212, 255, .12), transparent 60%);
  z-index: 0;
}
.hero-grid-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, .03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .03) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
  z-index: 1;
}
.hero-inner {
  position: relative;
  z-index: 2;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  width: 100%;
}
.hero-content {
  max-width: 820px;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: rgba(0, 212, 255, .08);
  border: 1px solid rgba(0, 212, 255, .25);
  border-radius: 999px;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--accent);
  margin-bottom: 24px;
}
.hero-badge .dot {
  width: 6px; height: 6px;
  background: var(--accent);
  border-radius: 50%;
  box-shadow: 0 0 12px var(--accent);
}
.hero h1 {
  margin-bottom: 24px;
  background: linear-gradient(180deg, #ffffff 0%, #b5b5b5 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-sub {
  font-size: clamp(1.0625rem, 1.5vw, 1.25rem);
  color: var(--text-secondary);
  max-width: 620px;
  margin-bottom: 40px;
  line-height: 1.65;
}
.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}
.hero-stats {
  margin-top: 80px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 32px;
  max-width: 760px;
  padding-top: 40px;
  border-top: 1px solid var(--border);
}
.hero-stat-num {
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}
.hero-stat-num .unit { color: var(--accent); }
.hero-stat-label {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ---------- Page Header (Sub-pages) ---------- */
.page-header {
  padding-top: calc(var(--nav-height) + 100px);
  padding-bottom: 80px;
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--border);
}
.page-header::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 60% 70% at 50% 0%, rgba(0, 102, 255, .15), transparent 70%);
}
.page-header-inner {
  position: relative;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  text-align: center;
}
.page-header h1 {
  font-size: clamp(1.4rem, 3.5vw, 2.45rem);
}
.page-header p {
  max-width: 700px;
  margin: 20px auto 0;
  font-size: 1.125rem;
}

/* ---------- Cards & Grids ---------- */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}
.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  transition: all .3s ease;
  position: relative;
  overflow: hidden;
}
.card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-light);
  transform: translateY(-4px);
}
.card-icon {
  width: 56px; height: 56px;
  background: linear-gradient(135deg, rgba(0, 212, 255, .15), rgba(0, 102, 255, .15));
  border: 1px solid rgba(0, 212, 255, .3);
  border-radius: 14px;
  display: grid;
  place-items: center;
  margin-bottom: 24px;
  font-size: 1.5rem;
}
.card h3 { margin-bottom: 12px; }
.card p { font-size: 0.9375rem; }
.card-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-top: 20px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--accent);
}
.card-link:hover { gap: 8px; }

/* ---------- Feature Section (alternating) ---------- */
.feature-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
  margin-bottom: 120px;
}
.feature-row:last-child { margin-bottom: 0; }
.feature-row.reverse { direction: rtl; }
.feature-row.reverse > * { direction: ltr; }
.feature-text h2 { margin-bottom: 24px; }
.feature-text p {
  font-size: 1.0625rem;
  margin-bottom: 24px;
  line-height: 1.75;
}
.feature-list { margin-top: 24px; }
.feature-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 10px 0;
  color: var(--text-secondary);
  font-size: 0.9375rem;
}
.feature-list li::before {
  content: '';
  flex-shrink: 0;
  width: 18px; height: 18px;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  border-radius: 50%;
  margin-top: 4px;
  position: relative;
}
.feature-visual {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  aspect-ratio: 4 / 3;
  display: grid;
  place-items: center;
  overflow: hidden;
  position: relative;
}
.feature-visual::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 30% 30%, rgba(0, 212, 255, .15), transparent 60%),
    radial-gradient(ellipse at 70% 70%, rgba(0, 102, 255, .15), transparent 60%);
}
.feature-visual svg { position: relative; z-index: 1; max-width: 60%; height: auto; }

/* ---------- CTA Banner ---------- */
.cta-banner {
  background: linear-gradient(135deg, rgba(0, 102, 255, .12), rgba(0, 212, 255, .06));
  border: 1px solid rgba(0, 212, 255, .25);
  border-radius: var(--radius-lg);
  padding: 64px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.cta-banner::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 60% 100% at 50% 100%, rgba(0, 212, 255, .15), transparent 60%);
}
.cta-banner > * { position: relative; }
.cta-banner h2 { margin-bottom: 16px; }
.cta-banner p {
  font-size: 1.0625rem;
  margin-bottom: 32px;
  max-width: 540px;
  margin-left: auto;
  margin-right: auto;
}

/* ---------- Tables ---------- */
.info-table {
  width: 100%;
  border-collapse: collapse;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
}
.info-table th, .info-table td {
  padding: 18px 24px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  font-size: 0.9375rem;
}
.info-table tr:last-child th, .info-table tr:last-child td { border-bottom: none; }
.info-table th {
  background: var(--bg-card);
  color: var(--text-secondary);
  font-weight: 500;
  width: 200px;
  vertical-align: top;
}
.info-table td { color: var(--text-primary); }

/* ---------- Timeline ---------- */
.timeline {
  position: relative;
  padding-left: 32px;
  max-width: 720px;
  margin: 0 auto;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 8px; top: 8px; bottom: 8px;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent), var(--border));
}
.timeline-item {
  position: relative;
  padding-bottom: 40px;
}
.timeline-item::before {
  content: '';
  position: absolute;
  left: -32px; top: 6px;
  width: 18px; height: 18px;
  border-radius: 50%;
  background: var(--bg-black);
  border: 3px solid var(--accent);
  box-shadow: 0 0 0 4px rgba(0, 212, 255, .15);
}
.timeline-date {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 6px;
}
.timeline-item h4 { margin-bottom: 6px; }
.timeline-item p { font-size: 0.9375rem; }

/* ---------- News Cards ---------- */
.news-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: all .3s ease;
  display: block;
}
.news-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
}
.news-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}
.news-tag {
  padding: 4px 10px;
  background: rgba(0, 212, 255, .1);
  border: 1px solid rgba(0, 212, 255, .25);
  color: var(--accent);
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.75rem;
}
.news-card h3 {
  font-size: 1.125rem;
  margin-bottom: 12px;
  line-height: 1.4;
}
.news-card p { font-size: 0.9375rem; }

/* ---------- Contact Form ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 64px;
}
.contact-info-card {
  display: flex;
  gap: 16px;
  padding: 24px 0;
  border-bottom: 1px solid var(--border);
}
.contact-info-card:last-child { border-bottom: none; }
.contact-info-card .icon {
  flex-shrink: 0;
  width: 44px; height: 44px;
  background: rgba(0, 212, 255, .1);
  border: 1px solid rgba(0, 212, 255, .25);
  border-radius: 12px;
  display: grid;
  place-items: center;
  color: var(--accent);
  font-size: 1.25rem;
}
.contact-info-card h4 { font-size: 0.875rem; color: var(--text-muted); margin-bottom: 4px; font-weight: 500; }
.contact-info-card .value { font-size: 1.0625rem; color: var(--text-primary); }

.form-group {
  margin-bottom: 20px;
}
.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 8px;
}
.form-input, .form-textarea, .form-select {
  width: 100%;
  padding: 14px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text-primary);
  font-size: 0.9375rem;
  font-family: inherit;
  transition: all .2s ease;
}
.form-input:focus, .form-textarea:focus, .form-select:focus {
  outline: none;
  border-color: var(--accent);
  background: var(--bg-card-hover);
}
.form-textarea {
  min-height: 140px;
  resize: vertical;
}
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

/* ---------- Footer ---------- */
.footer {
  background: #050505;
  border-top: 1px solid var(--border);
  padding: 80px 0 32px;
  color: var(--text-muted);
}
.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 56px;
}
.footer-brand h4 {
  font-size: 1.125rem;
  margin-bottom: 12px;
  color: var(--text-primary);
}
.footer-brand p { font-size: 0.875rem; line-height: 1.7; }
.footer-col h5 {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 20px;
  letter-spacing: 0.02em;
}
.footer-col ul li { margin-bottom: 10px; }
.footer-col a {
  font-size: 0.875rem;
  color: var(--text-muted);
}
.footer-col a:hover { color: var(--accent); }
.footer-bottom {
  padding-top: 32px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.8125rem;
}

/* ---------- Animations ---------- */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity .8s ease, transform .8s ease;
}
.reveal.in-view {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .feature-row { gap: 48px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  :root { --section-pad: 72px; --nav-height: 64px; }
  .nav-menu {
    position: fixed;
    top: var(--nav-height); left: 0; right: 0;
    background: rgba(10, 10, 10, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    align-items: stretch;
    padding: 24px;
    gap: 0;
    transform: translateY(-120%);
    transition: transform .3s ease;
    border-bottom: 1px solid var(--border);
  }
  .nav-menu.open { transform: translateY(0); }
  .nav-menu a {
    padding: 14px 0;
    border-bottom: 1px solid var(--border);
    font-size: 1rem;
  }
  .nav-menu a.active::after { display: none; }
  .nav-cta { margin-top: 16px; justify-content: center; }
  .nav-toggle { display: flex; }
  .grid-3, .grid-4, .grid-2 { grid-template-columns: 1fr; }
  .feature-row, .feature-row.reverse { grid-template-columns: 1fr; direction: ltr; }
  .form-row { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; gap: 40px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .cta-banner { padding: 40px 24px; }
  .info-table th, .info-table td { padding: 14px 16px; font-size: 0.875rem; }
  .info-table th { width: 120px; }
  .hero-stats { margin-top: 48px; gap: 20px; padding-top: 32px; }
}
@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .hero-actions .btn { justify-content: center; }
}

/* ---------- Print ---------- */
@media print {
  .nav, .footer, .hero-grid-bg { display: none; }
  body { color: #000; background: #fff; }
}

/* ---------- Section/CTA Title size (70%) ---------- */
.section-header h2 { font-size: clamp(1.4rem, 2.8vw, 2.1rem); }
.cta-banner h2 { font-size: clamp(1.4rem, 2.8vw, 2.1rem); }
/* ---------- Feature Title size (60%) ---------- */
.feature-text h2 { font-size: clamp(1.2rem, 2.4vw, 1.8rem); }
/* ---------- Card Title size (70%) ---------- */
.card h3 { font-size: clamp(1.05rem, 1.75vw, 1.4rem); }