/* ===================================
   써니데브스토리 - Design System
   =================================== */

/* --- CSS Custom Properties --- */
:root {
  /* Colors */
  --bg-primary: #060612;
  --bg-secondary: #0d0d24;
  --bg-card: rgba(20, 20, 50, 0.6);
  --bg-card-hover: rgba(30, 30, 70, 0.7);
  --bg-glass: rgba(255, 255, 255, 0.04);
  --bg-glass-hover: rgba(255, 255, 255, 0.08);

  --text-primary: #f0f0f8;
  --text-secondary: #a0a0c0;
  --text-muted: #6a6a90;

  --accent-orange: #ff8c42;
  --accent-orange-light: #ffab70;
  --accent-purple: #8b5cf6;
  --accent-purple-light: #a78bfa;
  --accent-teal: #14b8a6;
  --accent-teal-light: #2dd4bf;
  --accent-pink: #ec4899;

  --gradient-warm: linear-gradient(135deg, #ff8c42 0%, #ec4899 100%);
  --gradient-cool: linear-gradient(135deg, #8b5cf6 0%, #14b8a6 100%);
  --gradient-hero: linear-gradient(
    135deg,
    #ff8c42 0%,
    #8b5cf6 50%,
    #14b8a6 100%
  );

  --border-subtle: rgba(255, 255, 255, 0.06);
  --border-light: rgba(255, 255, 255, 0.1);

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;

  /* Typography */
  --font-sans:
    "Inter", "Noto Sans KR", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;
  --font-size-5xl: 3.5rem;
  --font-size-6xl: 4.5rem;

  /* Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 16px 64px rgba(0, 0, 0, 0.5);
  --shadow-glow-warm: 0 0 60px rgba(255, 140, 66, 0.15);
  --shadow-glow-cool: 0 0 60px rgba(139, 92, 246, 0.15);

  /* Transitions */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --duration-fast: 200ms;
  --duration-normal: 400ms;
  --duration-slow: 700ms;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  line-height: 1.7;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

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

/* --- Container --- */
.container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  padding: var(--space-lg) 0;
  transition: all var(--duration-normal) var(--ease-out);
}

.nav.scrolled {
  padding: var(--space-sm) 0;
  background: rgba(6, 6, 18, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
}

.nav-container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 var(--space-xl);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 700;
  font-size: var(--font-size-lg);
  transition: opacity var(--duration-fast);
}

.nav-logo:hover {
  opacity: 0.8;
}

.logo-icon {
  font-size: 1.5rem;
  animation: float 3s ease-in-out infinite;
}

@keyframes float {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-4px);
  }
}

.logo-text {
  background: var(--gradient-warm);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  gap: var(--space-xl);
}

.nav-link {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--text-secondary);
  padding: var(--space-sm) 0;
  position: relative;
  transition: color var(--duration-fast);
}

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

.nav-link:hover,
.nav-link.active {
  color: var(--text-primary);
}

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

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: var(--radius-full);
  transition: all var(--duration-fast);
}

/* --- Hero Section --- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-gradient {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(
      ellipse 80% 60% at 50% 40%,
      rgba(139, 92, 246, 0.12) 0%,
      transparent 60%
    ),
    radial-gradient(
      ellipse 60% 50% at 30% 60%,
      rgba(255, 140, 66, 0.08) 0%,
      transparent 50%
    ),
    radial-gradient(
      ellipse 50% 40% at 70% 30%,
      rgba(20, 184, 166, 0.06) 0%,
      transparent 50%
    );
}

.hero-particles {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.particle {
  position: absolute;
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
  animation: particleFloat linear infinite;
}

@keyframes particleFloat {
  0% {
    transform: translateY(0) scale(1);
    opacity: 0;
  }
  10% {
    opacity: 1;
  }
  90% {
    opacity: 1;
  }
  100% {
    transform: translateY(-100vh) scale(0.5);
    opacity: 0;
  }
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 800px;
  padding: var(--space-xl);
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  background: var(--bg-glass);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: var(--space-2xl);
  backdrop-filter: blur(10px);
}

.hero-title {
  font-size: var(--font-size-5xl);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: var(--space-xl);
  letter-spacing: -0.02em;
}

.hero-title-line {
  display: block;
}

.hero-title-highlight {
  display: block;
  background: var(--gradient-hero);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  background-size: 200% 200%;
  animation: gradientShift 5s ease infinite;
}

@keyframes gradientShift {
  0%,
  100% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
}

.hero-description {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: var(--space-2xl);
}

.hero-actions {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  margin-bottom: var(--space-3xl);
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 14px 32px;
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  font-weight: 600;
  border-radius: var(--radius-full);
  border: none;
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-out);
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient-warm);
  color: white;
  box-shadow: 0 4px 20px rgba(255, 140, 66, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(255, 140, 66, 0.45);
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-light);
  backdrop-filter: blur(10px);
}

.btn-outline:hover {
  background: var(--bg-glass-hover);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}

/* --- Hero Stats --- */
.hero-stats {
  display: flex;
  gap: var(--space-3xl);
  justify-content: center;
}

.stat {
  text-align: center;
}

.stat-number {
  display: block;
  font-size: var(--font-size-3xl);
  font-weight: 800;
  background: var(--gradient-cool);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

/* --- Scroll Indicator --- */
.scroll-indicator {
  position: absolute;
  bottom: var(--space-2xl);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  color: var(--text-muted);
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  animation: fadeInUp 1s var(--ease-out) 1.5s both;
}

.scroll-arrow {
  width: 20px;
  height: 30px;
  border: 2px solid var(--text-muted);
  border-radius: 10px;
  position: relative;
}

.scroll-arrow::after {
  content: "";
  position: absolute;
  top: 6px;
  left: 50%;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--accent-orange);
  transform: translateX(-50%);
  animation: scrollDot 2s ease-in-out infinite;
}

@keyframes scrollDot {
  0%,
  100% {
    top: 6px;
    opacity: 1;
  }
  50% {
    top: 18px;
    opacity: 0.3;
  }
}

/* --- Sections --- */
.section {
  padding: var(--space-4xl) 0;
  position: relative;
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-3xl);
}

.section-tag {
  display: inline-block;
  padding: var(--space-xs) var(--space-lg);
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--accent-orange);
  margin-bottom: var(--space-lg);
}

.section-title {
  font-size: var(--font-size-4xl);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-md);
}

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

/* --- About Section --- */
.about-content {
  max-width: 700px;
  margin: 0 auto;
}

.about-lead {
  font-size: var(--font-size-xl);
  line-height: 1.8;
  margin-bottom: var(--space-lg);
  color: var(--text-primary);
}

.about-text p {
  color: var(--text-secondary);
  margin-bottom: var(--space-xl);
}

.about-text em {
  color: var(--accent-orange-light);
  font-style: normal;
  font-weight: 600;
}

.about-highlights {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  margin-top: var(--space-2xl);
}

.highlight-item {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  padding: var(--space-lg);
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  transition: all var(--duration-normal) var(--ease-out);
}

.highlight-item:hover {
  background: var(--bg-glass-hover);
  border-color: var(--border-light);
  transform: translateX(8px);
}

.highlight-icon {
  font-size: 1.8rem;
  flex-shrink: 0;
}

.highlight-item div:last-child {
  display: flex;
  flex-direction: column;
}

.highlight-item strong {
  font-size: var(--font-size-base);
  margin-bottom: 2px;
}

.highlight-item span {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

/* --- Projects Section --- */
.projects {
  background: var(--bg-secondary);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-2xl);
}

.project-card {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: transform var(--duration-normal) var(--ease-out);
}

.project-card:hover {
  transform: translateY(-8px);
}

.project-card-glow {
  position: absolute;
  inset: -1px;
  border-radius: var(--radius-xl);
  z-index: 0;
  opacity: 0;
  transition: opacity var(--duration-slow) var(--ease-out);
}

.project-card-glow--warm {
  background: var(--gradient-warm);
}

.project-card-glow--cool {
  background: var(--gradient-cool);
}

.project-card:hover .project-card-glow {
  opacity: 1;
}

.project-card-inner {
  position: relative;
  z-index: 1;
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  overflow: hidden;
  margin: 1px;
}

.project-card:hover .project-card-inner {
  background: var(--bg-card-hover);
}

.project-image {
  position: relative;
  padding: var(--space-2xl);
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 220px;
  background: var(--bg-glass);
}

.project-image img {
  width: 140px;
  height: 140px;
  object-fit: cover;
  border-radius: var(--radius-lg);
  transition: transform var(--duration-normal) var(--ease-spring);
  box-shadow: var(--shadow-md);
}

.project-card:hover .project-image img {
  transform: scale(1.08) rotate(-2deg);
}

.project-badge {
  position: absolute;
  top: var(--space-lg);
  right: var(--space-lg);
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background: rgba(255, 140, 66, 0.15);
  border: 1px solid rgba(255, 140, 66, 0.3);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: 600;
  color: var(--accent-orange-light);
}

.project-badge--teal {
  background: rgba(20, 184, 166, 0.15);
  border-color: rgba(20, 184, 166, 0.3);
  color: var(--accent-teal-light);
}

.project-badge svg {
  width: 14px;
  height: 14px;
}

.project-info {
  padding: var(--space-xl) var(--space-2xl) var(--space-2xl);
}

.project-title {
  font-size: var(--font-size-2xl);
  font-weight: 800;
  margin-bottom: var(--space-xs);
}

.project-tagline {
  font-size: var(--font-size-sm);
  color: var(--accent-orange-light);
  font-weight: 600;
  margin-bottom: var(--space-md);
}

#project-goote .project-tagline {
  color: var(--accent-teal-light);
}

.project-description {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-lg);
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-xl);
}

.tech-badge {
  padding: 4px 12px;
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: 500;
  color: var(--text-muted);
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--accent-orange-light);
  transition: all var(--duration-fast);
}

#project-goote .project-link {
  color: var(--accent-teal-light);
}

.project-link:hover {
  gap: var(--space-md);
}

.project-link svg {
  transition: transform var(--duration-fast);
}

.project-link:hover svg {
  transform: translate(4px, -4px);
}

/* --- Vision Section --- */
.vision {
  position: relative;
  overflow: hidden;
  padding: var(--space-4xl) 0;
}

.vision-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.vision-gradient {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(
      ellipse 80% 60% at 50% 50%,
      rgba(139, 92, 246, 0.08) 0%,
      transparent 60%
    ),
    radial-gradient(
      ellipse 60% 40% at 20% 80%,
      rgba(255, 140, 66, 0.06) 0%,
      transparent 50%
    );
}

.vision-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 700px;
  margin: 0 auto;
}

.vision-title {
  font-size: var(--font-size-4xl);
  font-weight: 800;
  line-height: 1.4;
  margin-bottom: var(--space-2xl);
  letter-spacing: -0.02em;
}

.vision-highlight {
  background: var(--gradient-hero);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.vision-text {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  line-height: 2;
  margin-bottom: var(--space-3xl);
}

.vision-text strong {
  color: var(--text-primary);
}

/* --- Vision Roadmap --- */
.vision-roadmap {
  display: flex;
  flex-direction: column;
  gap: 0;
  max-width: 400px;
  margin: 0 auto;
  text-align: left;
}

.roadmap-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-lg);
  padding: var(--space-lg) 0;
  position: relative;
}

.roadmap-item::before {
  content: "";
  position: absolute;
  left: 9px;
  top: calc(var(--space-lg) + 20px);
  bottom: 0;
  width: 2px;
  background: var(--border-subtle);
}

.roadmap-item:last-child::before {
  display: none;
}

.roadmap-dot {
  width: 20px;
  height: 20px;
  min-width: 20px;
  border-radius: 50%;
  border: 2px solid var(--text-muted);
  background: var(--bg-primary);
  margin-top: 2px;
  position: relative;
  z-index: 1;
}

.roadmap-done .roadmap-dot {
  border-color: var(--accent-orange);
  background: var(--accent-orange);
}

.roadmap-done .roadmap-dot::after {
  content: "✓";
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  color: white;
  font-weight: 700;
}

.roadmap-current .roadmap-dot {
  border-color: var(--accent-purple);
  box-shadow: 0 0 0 4px rgba(139, 92, 246, 0.2);
  animation: pulseRing 2s ease-in-out infinite;
}

@keyframes pulseRing {
  0%,
  100% {
    box-shadow: 0 0 0 4px rgba(139, 92, 246, 0.2);
  }
  50% {
    box-shadow: 0 0 0 8px rgba(139, 92, 246, 0.1);
  }
}

.roadmap-content strong {
  display: block;
  font-size: var(--font-size-base);
  margin-bottom: 2px;
}

.roadmap-content span {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

.roadmap-current .roadmap-content strong {
  color: var(--accent-purple-light);
}

/* --- Contact Section --- */
.contact {
  background: var(--bg-secondary);
}

.contact-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
  max-width: 800px;
  margin: 0 auto;
}

.contact-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: var(--space-sm);
  padding: var(--space-2xl) var(--space-xl);
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  transition: all var(--duration-normal) var(--ease-out);
  cursor: pointer;
}

.contact-card:hover {
  background: var(--bg-glass-hover);
  border-color: var(--border-light);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.contact-icon {
  font-size: 2rem;
  margin-bottom: var(--space-sm);
}

.contact-card strong {
  font-size: var(--font-size-base);
}

.contact-card span {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  word-break: break-all;
}

/* --- Footer --- */
.footer {
  padding: var(--space-2xl) 0;
  border-top: 1px solid var(--border-subtle);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.footer-name {
  font-weight: 700;
  font-size: var(--font-size-base);
}

.footer-copy {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

/* --- Reveal Animations --- */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: all var(--duration-slow) var(--ease-out);
}

.reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translate(-50%, 20px);
  }
  to {
    opacity: 1;
    transform: translate(-50%, 0);
  }
}

/* --- Responsive --- */
@media (max-width: 968px) {
  .hero-title {
    font-size: var(--font-size-4xl);
  }

  .section-title,
  .vision-title {
    font-size: var(--font-size-3xl);
  }

  .projects-grid {
    grid-template-columns: 1fr;
    max-width: 550px;
    margin: 0 auto;
  }
}

@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: rgba(6, 6, 18, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 100px var(--space-2xl) var(--space-2xl);
    gap: var(--space-lg);
    transition: right var(--duration-normal) var(--ease-out);
    border-left: 1px solid var(--border-subtle);
  }

  .nav-links.open {
    right: 0;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }

  .nav-toggle.active span:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
  }

  .hero-title {
    font-size: var(--font-size-3xl);
  }

  .hero-description {
    font-size: var(--font-size-base);
  }

  .hero-actions {
    flex-direction: column;
    align-items: center;
  }

  .hero-stats {
    gap: var(--space-2xl);
  }

  .contact-cards {
    grid-template-columns: 1fr;
    max-width: 400px;
  }

  .footer-content {
    flex-direction: column;
    gap: var(--space-md);
    text-align: center;
  }

  .section-title,
  .vision-title {
    font-size: var(--font-size-2xl);
  }

  .vision-text {
    font-size: var(--font-size-base);
  }

  .about-lead {
    font-size: var(--font-size-lg);
  }
}

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

  .hero-title {
    font-size: var(--font-size-2xl);
  }

  .btn {
    padding: 12px 24px;
    font-size: var(--font-size-sm);
  }

  .project-info {
    padding: var(--space-lg);
  }

  .project-image {
    padding: var(--space-xl);
    min-height: 180px;
  }

  .project-image img {
    width: 110px;
    height: 110px;
  }
}

/* --- GEO Content Blocks --- */
.hero-summary {
  max-width: 720px;
  margin: 0 auto var(--space-2xl);
  color: var(--text-secondary);
  font-size: var(--font-size-base);
  line-height: 1.9;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

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

/* --- Container --- */
.container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  padding: var(--space-lg) 0;
  transition: all var(--duration-normal) var(--ease-out);
}

.nav.scrolled {
  padding: var(--space-sm) 0;
  background: rgba(6, 6, 18, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
}

/* Language Visibility Toggles */
:root:not([lang="en"]) [lang="en"] {
  display: none !important;
}
:root[lang="en"] [lang="ko"] {
  display: none !important;
}

/* Lang Toggle Button */
.lang-toggle-wrapper {
  display: flex;
  align-items: center;
  margin-left: var(--space-md);
}
.lang-toggle {
  background: var(--bg-glass);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-full);
  display: flex;
  padding: 2px;
  cursor: pointer;
  transition: all var(--duration-fast);
}
.lang-toggle span {
  padding: 4px 10px;
  font-size: var(--font-size-xs);
  font-weight: 600;
  color: var(--text-muted);
  border-radius: var(--radius-full);
  transition: all var(--duration-fast);
}
.lang-toggle span.active {
  background: var(--gradient-warm);
  color: #fff;
}

.nav-container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 var(--space-xl);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 700;
  font-size: var(--font-size-lg);
  transition: opacity var(--duration-fast);
}

.nav-logo:hover {
  opacity: 0.8;
}

.logo-icon {
  font-size: 1.5rem;
  animation: float 3s ease-in-out infinite;
}

@keyframes float {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-4px);
  }
}

.logo-text {
  background: var(--gradient-warm);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  gap: var(--space-xl);
}

.nav-link {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--text-secondary);
  padding: var(--space-sm) 0;
  position: relative;
  transition: color var(--duration-fast);
}

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

.nav-link:hover,
.nav-link.active {
  color: var(--text-primary);
}

.about-facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-md);
  margin: 0 0 var(--space-2xl);
}

.fact-item {
  padding: var(--space-lg);
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
}

.fact-label {
  display: block;
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.fact-value {
  display: block;
  color: var(--text-primary);
  font-weight: 600;
  line-height: 1.5;
}

.faq {
  background: linear-gradient(180deg, rgba(6, 6, 18, 1) 0%, rgba(13, 13, 36, 1) 100%);
}

.faq-list {
  max-width: 920px;
  margin: 0 auto;
  display: grid;
  gap: var(--space-lg);
}

.faq-item {
  padding: var(--space-xl);
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.faq-question {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-sm);
  letter-spacing: -0.02em;
}

.faq-answer {
  color: var(--text-secondary);
}

@media (max-width: 768px) {
  .about-facts {
    grid-template-columns: 1fr;
  }

  .faq-question {
    font-size: var(--font-size-lg);
  }
}

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

  .hero-title {
    font-size: var(--font-size-2xl);
  }

  .btn {
    padding: 12px 24px;
    font-size: var(--font-size-sm);
  }

  .project-info {
    padding: var(--space-lg);
  }

  .project-image {
    padding: var(--space-xl);
    min-height: 180px;
  }

  .project-image img {
    width: 110px;
    height: 110px;
  }
}

/* --- GEO Content Blocks --- */
.hero-summary {
  max-width: 720px;
  margin: 0 auto var(--space-2xl);
  color: var(--text-secondary);
  font-size: var(--font-size-base);
  line-height: 1.9;
}

.hero-summary strong {
  color: var(--text-primary);
}

.about-facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-md);
  margin: 0 0 var(--space-2xl);
}

.fact-item {
  padding: var(--space-lg);
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
}

.fact-label {
  display: block;
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.fact-value {
  display: block;
  color: var(--text-primary);
  font-weight: 600;
  line-height: 1.5;
}

.faq {
  background: linear-gradient(180deg, rgba(6, 6, 18, 1) 0%, rgba(13, 13, 36, 1) 100%);
}

.faq-list {
  max-width: 920px;
  margin: 0 auto;
  display: grid;
  gap: var(--space-lg);
}

.faq-item {
  padding: var(--space-xl);
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.faq-question {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-sm);
  letter-spacing: -0.02em;
}

.faq-answer {
  color: var(--text-secondary);
}

@media (max-width: 768px) {
  .about-facts {
    grid-template-columns: 1fr;
  }

  .faq-question {
    font-size: var(--font-size-lg);
  }
}

.fact-link {
  color: var(--text-primary);
  font-weight: 600;
  word-break: break-all;
}

.fact-link:hover {
  color: var(--accent-orange-light);
}

.contact-cards--four {
  grid-template-columns: repeat(4, 1fr);
  max-width: 1040px;
}

@media (max-width: 968px) {
  .contact-cards--four {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .contact-cards--four {
    grid-template-columns: 1fr;
    max-width: 400px;
  }
}