/* common.css */

/* ============================================================
   CSS Variables
   ============================================================ */
:root {
  --color-primary: #7c5cfc;
  --color-primary-dark: #6a4ce0;
  --color-primary-light: rgba(124, 92, 252, 0.15);
  --color-text: #e8e8f0;
  --color-text-secondary: #a0a0b8;
  --color-text-light: #6b6b80;
  --color-bg: #0a0a1a;
  --color-bg-light: #12122a;
  --color-bg-dark: #06060f;
  --color-bg-card: rgba(255, 255, 255, 0.05);
  --color-border: rgba(255, 255, 255, 0.1);
  --color-success: #10b981;

  --font-sans: 'Pretendard', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-en: 'Inter', var(--font-sans);

  --max-width: 1200px;
  --header-height: 72px;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);

  --transition: 0.3s ease;
}

/* ============================================================
   Typography
   ============================================================ */
body {
  font-family: var(--font-sans);
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-text);
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
}

/* ============================================================
   Layout
   ============================================================ */
.container {
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

.section {
  padding-top: 80px;
  padding-bottom: 80px;
}

main {
  padding-top: var(--header-height);
}

/* ============================================================
   Header
   ============================================================ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  background-color: rgba(10, 10, 26, 0.9);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.header-logo img {
  height: 32px;
  width: auto;
}

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

.nav-item {
  position: relative;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text);
  transition: color var(--transition);
}

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

/* Dropdown */
.dropdown {
  position: absolute;
  top: calc(100% + 12px);
  left: 50%;
  transform: translateX(-50%) translateY(8px);
  min-width: 200px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: 8px 0;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition), visibility var(--transition), transform var(--transition);
  z-index: 100;
}

.nav-item:hover .dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.dropdown a {
  display: block;
  padding: 10px 16px;
  font-size: 0.9rem;
  color: var(--color-text);
  transition: background var(--transition), color var(--transition);
}

.dropdown a:hover {
  background: var(--color-bg-light);
  color: var(--color-primary);
}

/* Header CTA buttons */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-primary);
  color: #ffffff;
  padding: 10px 24px;
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  font-weight: 600;
  transition: background-color var(--transition), box-shadow var(--transition);
  white-space: nowrap;
}

.btn-primary:hover {
  background-color: var(--color-primary-dark);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: transparent;
  color: var(--color-primary);
  padding: 10px 24px;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--color-primary);
  font-size: 0.9375rem;
  font-weight: 600;
  transition: background-color var(--transition), color var(--transition);
  white-space: nowrap;
}

.btn-outline:hover {
  background-color: var(--color-primary-light);
}

/* Mobile toggle */
.mobile-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 28px;
  height: 28px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 0;
}

.mobile-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

/* ============================================================
   Footer
   ============================================================ */
.site-footer {
  background-color: var(--color-bg-dark);
  color: var(--color-text-secondary);
  border-top: 1px solid var(--color-border);
}

.footer-inner {
  padding-top: 64px;
  padding-bottom: 40px;
}

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

.footer-links h4 {
  color: #ffffff;
  font-size: 0.9375rem;
  font-weight: 600;
  margin-bottom: 16px;
}

.footer-links a {
  display: block;
  color: var(--color-text-light);
  font-size: 0.875rem;
  margin-bottom: 10px;
  transition: color var(--transition);
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.8125rem;
  color: var(--color-text-light);
}

.footer-company-info {
  font-size: 0.8125rem;
  color: var(--color-text-light);
  line-height: 1.8;
}

/* ============================================================
   Scroll Animation
   ============================================================ */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

/* ============================================================
   Responsive — 1199px and below
   ============================================================ */
@media (max-width: 1199px) {
  .footer-top {
    grid-template-columns: 1fr 1fr;
  }
}

/* ============================================================
   Responsive — 767px and below (mobile)
   ============================================================ */
@media (max-width: 767px) {
  /* Header mobile mode */
  .header-nav {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: 16px 24px;
    box-shadow: var(--shadow-md);
  }

  .header-nav.open {
    display: flex;
  }

  .nav-item {
    width: 100%;
    padding: 12px 0;
    border-bottom: 1px solid var(--color-border);
  }

  .nav-item:last-child {
    border-bottom: none;
  }

  .dropdown {
    position: static;
    transform: none;
    opacity: 1;
    visibility: visible;
    box-shadow: none;
    border: none;
    padding: 0;
    min-width: unset;
  }

  .nav-item:hover .dropdown {
    transform: none;
  }

  .mobile-toggle {
    display: flex;
  }

  /* Section */
  .section {
    padding-top: 48px;
    padding-bottom: 48px;
  }

  .section-title {
    font-size: 1.5rem;
  }

  /* Footer */
  .footer-top {
    grid-template-columns: 1fr;
  }
}