@import url("https://cdn.jsdelivr.net/gh/orioncactus/pretendard@v1.3.9/dist/web/static/pretendard.min.css");

:root {
  --bg-primary: #070913;
  --bg-secondary: #0e1222;
  --bg-tertiary: #171d34;
  --primary: #3b82f6;
  --primary-glow: rgba(59, 130, 246, 0.15);
  --primary-gradient: linear-gradient(135deg, #3b82f6 0%, #6366f1 100%);
  --accent: #06b6d4;
  --accent-gradient: linear-gradient(135deg, #06b6d4 0%, #3b82f6 100%);
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --border: rgba(255, 255, 255, 0.06);
  --border-hover: rgba(255, 255, 255, 0.15);
  --shadow: 0 20px 40px -15px rgba(0, 0, 0, 0.7);
  --glow-shadow: 0 0 30px rgba(59, 130, 246, 0.1);
  --max-width: 1200px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-family: "Pretendard", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

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

html {
  scroll-behavior: smooth;
  background-color: var(--bg-primary);
  color: var(--text-main);
  font-family: var(--font-family);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

/* Scrollbar Customization */
::-webkit-scrollbar {
  width: 10px;
}
::-webkit-scrollbar-track {
  background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
  background: var(--bg-tertiary);
  border-radius: 5px;
  border: 2px solid var(--bg-primary);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--primary);
}

/* Cross-Document View Transitions */
@media (prefers-reduced-motion: no-preference) {
  @view-transition {
    navigation: auto;
  }
}

/* Header & Navigation */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(7, 9, 19, 0.7);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}

header.scrolled {
  background: rgba(7, 9, 19, 0.9);
  box-shadow: var(--shadow);
}

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.25rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 1.4rem;
  font-weight: 800;
  text-decoration: none;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  letter-spacing: -0.03em;
}

.logo-icon {
  width: 26px;
  height: 26px;
  flex-shrink: 0;
  display: inline-block;
  vertical-align: middle;
  filter: drop-shadow(0 0 4px rgba(6, 182, 212, 0.4));
  transition: var(--transition);
}

.logo:hover .logo-icon {
  transform: rotate(15deg) scale(1.05);
}


.logo-dot {
  width: 8px;
  height: 8px;
  background: var(--primary-gradient);
  border-radius: 50%;
  display: inline-block;
  box-shadow: 0 0 10px var(--primary);
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 2.5rem;
  align-items: center;
}

.nav-link {
  text-decoration: none;
  color: var(--text-muted);
  font-weight: 500;
  font-size: 1rem;
  transition: var(--transition);
  position: relative;
  padding: 0.25rem 0;
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary-gradient);
  transition: var(--transition);
  border-radius: 2px;
}

.nav-link:hover {
  color: var(--text-main);
}

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

.nav-link.active {
  color: var(--text-main);
  font-weight: 600;
}

/* Mobile Hamburger Menu */
.hamburger {
  display: none;
  cursor: pointer;
  background: none;
  border: none;
  outline: none;
  padding: 0.5rem;
  z-index: 1100;
}

.hamburger-line {
  display: block;
  width: 24px;
  height: 2px;
  margin: 5px auto;
  background-color: var(--text-main);
  transition: var(--transition);
}

/* Layout Main Content Wrapper */
main {
  flex: 1;
  padding-top: 80px; /* Space for fixed header */
}

/* Hero Section */
.hero {
  position: relative;
  padding: 8rem 2rem 6rem;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
}

.hero-background {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
  opacity: 0.15;
  filter: blur(4px);
  z-index: 1;
  transform: scale(1.05);
}

/* Optimized Background Images with image-set() */
.hero-background.hero-home {
  background-image: url("/images/hero_meeting.jpg");
  background-image: image-set(
    url("/images/hero_meeting.webp") type("image/webp"),
    url("/images/hero_meeting.jpg") type("image/jpeg")
  );
}

.hero-background.hero-software {
  background-image: url("/images/software_hero.jpg");
  background-image: image-set(
    url("/images/software_hero.webp") type("image/webp"),
    url("/images/software_hero.jpg") type("image/jpeg")
  );
}

.hero-background.hero-system {
  background-image: url("/images/cloud_datacenter.jpg");
  background-image: image-set(
    url("/images/cloud_datacenter.webp") type("image/webp"),
    url("/images/cloud_datacenter.jpg") type("image/jpeg")
  );
}

.hero-glow {
  position: absolute;
  top: 20%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.15) 0%, rgba(7, 9, 19, 0) 70%);
  z-index: 2;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 3;
  max-width: 800px;
  margin: 0 auto;
}

.hero-tagline {
  display: inline-block;
  padding: 0.5rem 1.25rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border);
  border-radius: 9999px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 2rem;
  backdrop-filter: blur(8px);
  box-shadow: var(--glow-shadow);
  animation: fadeInDown 0.8s ease-out;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 1.5rem;
  background: linear-gradient(135deg, #ffffff 40%, #a5b4fc 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: fadeInUp 0.8s ease-out;
}

.hero-description {
  font-size: 1.25rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 2.5rem;
  animation: fadeInUp 1s ease-out;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  animation: fadeInUp 1.2s ease-out;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.875rem 2rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: 12px;
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition);
}

.btn-primary {
  background: var(--primary-gradient);
  color: #ffffff;
  border: none;
  box-shadow: 0 4px 20px rgba(59, 130, 246, 0.3), var(--glow-shadow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(59, 130, 246, 0.4), var(--primary-glow);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.03);
  color: var(--text-main);
  border: 1px solid var(--border);
  backdrop-filter: blur(8px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--border-hover);
  transform: translateY(-2px);
}

/* Sections */
.section {
  padding: 6rem 2rem;
  max-width: var(--max-width);
  margin: 0 auto;
  width: 100%;
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 4rem;
}

.section-subtitle {
  color: var(--accent);
  font-size: 0.9rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.75rem;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.02em;
}

.section-desc {
  margin-top: 1rem;
  color: var(--text-muted);
  font-size: 1.1rem;
}

/* Card Grid Styles */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
}

.card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 20px;
  overflow: hidden;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.card:hover {
  transform: translateY(-6px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow), var(--glow-shadow);
}

.card-img-wrapper {
  position: relative;
  height: 220px;
  overflow: hidden;
}

.card-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}

.card:hover .card-img {
  transform: scale(1.05);
}

.card-img-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(to bottom, rgba(14, 18, 34, 0) 50%, rgba(14, 18, 34, 0.9) 100%);
}

.card-body {
  padding: 2rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.card-title {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.card-desc {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* Row-based Layout Blocks (For Details Pages) */
.content-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
  margin-bottom: 6rem;
}

.content-row:nth-child(even) {
  direction: rtl;
}

.content-row:nth-child(even) .content-text-block {
  direction: ltr;
}

.content-text-block h3 {
  font-size: 1.8rem;
  font-weight: 800;
  margin-bottom: 1.25rem;
  background: linear-gradient(135deg, #ffffff 70%, #818cf8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.content-text-block p {
  color: var(--text-muted);
  font-size: 1.05rem;
  line-height: 1.8;
  margin-bottom: 1.5rem;
}

.content-media-block {
  position: relative;
  border-radius: 24px;
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.content-media-block img {
  width: 100%;
  display: block;
  transition: var(--transition);
  max-height: 380px;
  object-fit: cover;
}

.content-row:hover .content-media-block img {
  transform: scale(1.03);
}

/* Platform & Brand Grid */
.brand-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
  margin-top: 3rem;
}

.brand-card {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 2rem;
  text-align: center;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
}

.brand-card:hover {
  background: rgba(255, 255, 255, 0.04);
  border-color: rgba(59, 130, 246, 0.3);
  transform: translateY(-4px);
  box-shadow: var(--glow-shadow);
}

.brand-logo-wrapper {
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.brand-logo {
  width: 100%;
  height: 100%;
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  transition: var(--transition);
}

.brand-logo.invert-dark {
  filter: brightness(0) invert(0.85);
  opacity: 0.85;
}

.brand-card:hover .brand-logo.invert-dark {
  filter: brightness(0) invert(1);
  opacity: 1;
}

.brand-name {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-main);
}

/* Contact Area */
.contact-section {
  background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
  border-top: 1px solid var(--border);
  padding: 6rem 2rem;
  text-align: center;
}

.contact-box {
  max-width: 600px;
  margin: 0 auto;
  background: rgba(255, 255, 255, 0.01);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 3.5rem 2rem;
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow);
}

.contact-box h3 {
  font-size: 1.75rem;
  font-weight: 800;
  margin-bottom: 1rem;
}

.contact-box p {
  color: var(--text-muted);
  margin-bottom: 2rem;
}

/* Footer styling */
footer {
  background-color: #04050a;
  border-top: 1px solid var(--border);
  padding: 4rem 2rem 2.5rem;
}

.footer-content {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 4rem;
  margin-bottom: 3rem;
}

.footer-info {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.footer-brand {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-main);
}

.footer-meta {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.8;
}

.footer-meta span {
  display: block;
}

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

.footer-links-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-main);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-nav {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  list-style: none;
}

.footer-nav a {
  text-decoration: none;
  color: var(--text-muted);
  font-size: 0.95rem;
  transition: var(--transition);
}

.footer-nav a:hover {
  color: var(--text-main);
  padding-left: 4px;
}

.footer-bottom {
  max-width: var(--max-width);
  margin: 0 auto;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.04);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: var(--text-muted);
}

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

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

/* Responsive adjustments */
@media (max-width: 900px) {
  .nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: var(--bg-secondary);
    border-left: 1px solid var(--border);
    flex-direction: column;
    justify-content: center;
    gap: 2rem;
    transition: var(--transition);
    z-index: 1050;
  }

  .nav-menu.open {
    right: 0;
    box-shadow: -10px 0 30px rgba(0, 0, 0, 0.5);
  }

  .hamburger {
    display: block;
  }

  .hamburger.active .hamburger-line:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .hamburger.active .hamburger-line:nth-child(2) {
    opacity: 0;
  }

  .hamburger.active .hamburger-line:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  .hero-title {
    font-size: 2.5rem;
  }

  .content-row {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .content-row:nth-child(even) {
    direction: ltr;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

@media (max-width: 600px) {
  .hero-title {
    font-size: 2rem;
  }
  
  .hero-description {
    font-size: 1rem;
  }

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

  .btn {
    width: 100%;
  }
  
  .section {
    padding: 4rem 1.5rem;
  }
  
  .footer-bottom {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
}

/* Header Actions & Language Switcher */
.header-actions {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.lang-switcher {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border);
  padding: 0.35rem 0.85rem;
  border-radius: 9999px;
  font-size: 0.8rem;
  font-weight: 700;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  letter-spacing: 0.05em;
}

.lang-btn {
  text-decoration: none;
  color: var(--text-muted);
  transition: var(--transition);
  cursor: pointer;
}

.lang-btn:hover {
  color: var(--text-main);
}

.lang-btn.active {
  color: var(--primary);
  text-shadow: 0 0 10px rgba(59, 130, 246, 0.4);
}

.lang-divider {
  color: rgba(255, 255, 255, 0.12);
  font-size: 0.75rem;
  user-select: none;
}

@media (max-width: 900px) {
  .header-actions {
    gap: 0.75rem;
  }
}

/* Toast Notification */
#toast-notification {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: rgba(14, 18, 34, 0.95);
  color: var(--text-main);
  border: 1px solid var(--primary);
  padding: 0.85rem 2rem;
  border-radius: 12px;
  font-size: 0.95rem;
  font-weight: 600;
  z-index: 2000;
  box-shadow: 0 10px 30px rgba(59, 130, 246, 0.2), var(--glow-shadow);
  opacity: 0;
  transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275), opacity 0.3s ease;
  pointer-events: none;
  backdrop-filter: blur(8px);
}

#toast-notification.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

/* Contact Button Layout */
.contact-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  margin-top: 1.5rem;
}

@media (max-width: 600px) {
  .contact-buttons {
    flex-direction: column;
    width: 100%;
  }
}