/* =============================================
   Design Tokens (CSS Custom Properties)
   ============================================= */
:root {
  /* Colors */
  --color-primary: #5BA3D9;
  --color-primary-dark: #4A8BC2;
  --color-secondary: #10B981;
  --color-accent: #F59E0B;
  --color-bg: #FAFAF9;
  --color-text: #1C1917;
  --color-text-light: #78716C;
  --color-card-bg: #FFFFFF;
  --color-card-shadow: rgba(0, 0, 0, 0.08);
  --color-card-hover-shadow: rgba(0, 0, 0, 0.16);
  --color-header-bg: rgba(250, 250, 249, 0.95);
  --color-footer-bg: #1C1917;
  --color-footer-text: #F5F5F4;

  /* Typography */
  --font-family: "Pretendard", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-size-hero: clamp(2rem, 5vw, 3.5rem);
  --font-size-h2: clamp(1.5rem, 3vw, 2rem);
  --font-size-h3: clamp(1.125rem, 2vw, 1.375rem);
  --font-size-body: 1rem;
  --font-size-small: 0.875rem;
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;
  --line-height-tight: 1.2;
  --line-height-normal: 1.6;

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 5rem;
  --space-3xl: 8rem;

  /* Layout */
  --max-width: 1200px;
  --container-padding: clamp(1rem, 5vw, 2rem);
  --card-radius: 20px;
  --card-shadow: 0 4px 24px var(--color-card-shadow);
  --card-hover-shadow: 0 16px 48px var(--color-card-hover-shadow);

  /* Animation */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
  --animation-duration: 0.6s;
  --animation-easing: cubic-bezier(0.16, 1, 0.3, 1);
}

/* prefers-reduced-motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* =============================================
   Base Styles
   ============================================= */
body {
  font-family: var(--font-family);
  font-size: var(--font-size-body);
  font-weight: var(--font-weight-regular);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: var(--line-height-normal);
}

/* =============================================
   Layout
   ============================================= */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--container-padding);
}

/* =============================================
   Header
   ============================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-header-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
  padding-block: var(--space-sm);
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo-img {
  border-radius: 50%;
}

.logo-text {
  font-size: 1.25rem;
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
  letter-spacing: -0.02em;
}

/* =============================================
   Hero Section
   ============================================= */
.hero {
  padding-block: var(--space-3xl) var(--space-2xl);
  text-align: center;
  background: linear-gradient(
    135deg,
    color-mix(in srgb, var(--color-primary) 8%, var(--color-bg)) 0%,
    var(--color-bg) 60%,
    color-mix(in srgb, var(--color-secondary) 6%, var(--color-bg)) 100%
  );
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 70% 20%, rgba(37, 99, 235, 0.06) 0%, transparent 60%),
              radial-gradient(ellipse at 20% 80%, rgba(16, 185, 129, 0.05) 0%, transparent 60%);
  pointer-events: none;
}

.hero-title {
  font-size: var(--font-size-hero);
  font-weight: var(--font-weight-extrabold);
  line-height: var(--line-height-tight);
  letter-spacing: -0.03em;
  color: var(--color-text);
  margin-bottom: var(--space-md);
  opacity: 0;
  transform: translateY(24px);
  animation: fadeInUp var(--animation-duration) var(--animation-easing) 0.1s forwards;
}

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--color-text-light);
  max-width: 560px;
  margin-inline: auto;
  margin-bottom: var(--space-lg);
  opacity: 0;
  transform: translateY(24px);
  animation: fadeInUp var(--animation-duration) var(--animation-easing) 0.25s forwards;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  background-color: var(--color-primary);
  color: #FFFFFF;
  font-weight: var(--font-weight-bold);
  font-size: 1rem;
  padding: 0.875rem 2rem;
  border-radius: 50px;
  transition: background-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
  box-shadow: 0 4px 14px rgba(91, 163, 217, 0.35);
  opacity: 0;
  animation: fadeInUp var(--animation-duration) var(--animation-easing) 0.4s forwards;
  min-height: 48px;
}

.hero-cta:hover {
  background-color: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(91, 163, 217, 0.5);
}

.hero-cta:active {
  transform: translateY(0);
}

.hero-photos {
  position: relative;
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  margin-top: var(--space-xl);
  opacity: 0;
  animation: fadeInUp var(--animation-duration) var(--animation-easing) 0.6s forwards;
}

.hero-photo {
  border-radius: 16px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
  object-fit: cover;
}

.hero-photo--1 { transform: rotate(-3deg); }
.hero-photo--2 { transform: rotate(1deg) translateY(12px); }
.hero-photo--3 { transform: rotate(3deg); }

@media (max-width: 767px) {
  .hero-photos {
    gap: var(--space-xs);
  }
  .hero-photo {
    width: 100px;
    height: 67px;
  }
}

/* =============================================
   Portfolio Section
   ============================================= */
.portfolio {
  padding-block: var(--space-2xl);
}

.section-title {
  font-size: var(--font-size-h2);
  font-weight: var(--font-weight-extrabold);
  letter-spacing: -0.02em;
  text-align: center;
  margin-bottom: var(--space-xs);
}

.section-subtitle {
  color: var(--color-text-light);
  text-align: center;
  margin-bottom: var(--space-xl);
}

/* =============================================
   Site Grid
   ============================================= */
.site-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}

@media (min-width: 768px) {
  .site-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* =============================================
   Site Card
   ============================================= */
.site-card {
  background-color: var(--color-card-bg);
  border-radius: var(--card-radius);
  box-shadow: var(--card-shadow);
  overflow: hidden;
  cursor: pointer;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
  display: flex;
  flex-direction: column;
}

@media (hover: hover) {
  .site-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--card-hover-shadow);
  }

  .site-card:hover .card-image {
    transform: scale(1.04);
  }

  .site-card:hover .card-link {
    background-color: var(--color-primary-dark);
  }
}

.site-card:active {
  transform: scale(0.99);
}

/* =============================================
   Card Image
   ============================================= */
.card-image-wrap {
  overflow: hidden;
  aspect-ratio: 16 / 10;
  background-color: #F3F4F6;
}

.card-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
  display: block;
}

/* =============================================
   Card Body
   ============================================= */
.card-body {
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  flex: 1;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.375rem;
}

.tag {
  font-size: 0.75rem;
  font-weight: var(--font-weight-medium);
  color: var(--color-primary);
  background-color: color-mix(in srgb, var(--color-primary) 10%, transparent);
  padding: 0.25rem 0.625rem;
  border-radius: 50px;
}

.card-title {
  font-size: var(--font-size-h3);
  font-weight: var(--font-weight-bold);
  letter-spacing: -0.01em;
  color: var(--color-text);
  margin-top: var(--space-xs);
}

.card-desc {
  font-size: var(--font-size-small);
  color: var(--color-text-light);
  line-height: var(--line-height-normal);
  flex: 1;
}

.card-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-primary);
  color: #FFFFFF;
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-small);
  padding: 0.625rem 1.25rem;
  border-radius: 50px;
  transition: background-color var(--transition-fast);
  margin-top: var(--space-sm);
  align-self: flex-start;
  min-height: 44px;
}

/* =============================================
   Footer
   ============================================= */
.site-footer {
  background-color: var(--color-footer-bg);
  color: var(--color-footer-text);
  padding-block: var(--space-xl);
  text-align: center;
}

.footer-brand {
  font-size: 1.125rem;
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--space-xs);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.375rem;
}

.footer-logo {
  border-radius: 50%;
}

.footer-desc {
  font-size: var(--font-size-small);
  opacity: 0.7;
  margin-bottom: var(--space-sm);
}

.footer-copy {
  font-size: var(--font-size-small);
  opacity: 0.5;
}

/* =============================================
   Scroll Animations
   ============================================= */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-on-scroll {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity var(--animation-duration) var(--animation-easing),
              transform var(--animation-duration) var(--animation-easing);
}

.animate-on-scroll.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* =============================================
   Trust Section
   ============================================= */
.trust-section {
  padding-block: var(--space-2xl);
  background-color: color-mix(in srgb, var(--color-primary) 4%, var(--color-bg));
}

.trust-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
  margin-top: var(--space-xl);
}

@media (min-width: 768px) {
  .trust-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.trust-card {
  background-color: var(--color-card-bg);
  border-radius: var(--card-radius);
  padding: var(--space-lg);
  text-align: center;
  box-shadow: var(--card-shadow);
}

.trust-icon {
  font-size: 2.5rem;
  margin-bottom: var(--space-sm);
}

.trust-title {
  font-size: 1.125rem;
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
  margin-bottom: var(--space-xs);
}

.trust-desc {
  font-size: var(--font-size-small);
  color: var(--color-text-light);
  line-height: var(--line-height-normal);
}

/* =============================================
   Contact Section
   ============================================= */
.contact-section {
  padding-block: var(--space-2xl);
}

.contact-inner {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  border-radius: calc(var(--card-radius) * 1.5);
  padding: var(--space-2xl) var(--space-xl);
  text-align: center;
  color: #FFFFFF;
}

.contact-title {
  font-size: clamp(1.25rem, 3vw, 1.875rem);
  font-weight: var(--font-weight-extrabold);
  letter-spacing: -0.02em;
  margin-bottom: var(--space-sm);
}

.contact-desc {
  font-size: clamp(0.875rem, 1.5vw, 1rem);
  opacity: 0.85;
  margin-bottom: var(--space-lg);
}

.contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  justify-content: center;
}

.contact-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.875rem 1.75rem;
  border-radius: 50px;
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-body);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
  min-height: 48px;
}

.contact-btn--primary {
  background-color: #FFFFFF;
  color: var(--color-primary);
}

.contact-btn--secondary {
  background-color: rgba(255, 255, 255, 0.15);
  color: #FFFFFF;
  border: 2px solid rgba(255, 255, 255, 0.4);
}

.contact-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}

/* =============================================
   FAQ Section
   ============================================= */
.faq-section {
  padding: var(--space-3xl) 0;
  background: var(--color-bg);
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.faq-item {
  background: var(--color-card-bg);
  border-radius: var(--card-radius);
  box-shadow: var(--card-shadow);
  overflow: hidden;
  transition: box-shadow var(--transition-normal);
}

.faq-item[open] {
  box-shadow: var(--card-hover-shadow);
}

.faq-question {
  padding: var(--space-md) var(--space-lg);
  font-size: var(--font-size-h3);
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-sm);
  transition: color var(--transition-fast);
}

.faq-question::-webkit-details-marker { display: none; }
.faq-question::marker { display: none; }

.faq-question::after {
  content: '+';
  font-size: 1.5rem;
  font-weight: var(--font-weight-regular);
  color: var(--color-primary);
  flex-shrink: 0;
  transition: transform var(--transition-normal);
}

.faq-item[open] .faq-question::after {
  transform: rotate(45deg);
}

.faq-question:hover {
  color: var(--color-primary);
}

.faq-answer {
  padding: 0 var(--space-lg) var(--space-md);
  border-top: 1px solid rgba(0,0,0,0.06);
}

.faq-answer p {
  color: var(--color-text-light);
  line-height: var(--line-height-normal);
  margin: var(--space-sm) 0 0;
}

/* =============================================
   Breadcrumb Navigation
   ============================================= */
.breadcrumb {
  padding: var(--space-sm) 0;
  font-size: var(--font-size-small);
  color: var(--color-text-light);
}

.breadcrumb a {
  color: var(--color-primary);
  text-decoration: none;
}

.breadcrumb a:hover {
  text-decoration: underline;
}

.breadcrumb-sep {
  margin: 0 0.4rem;
  opacity: 0.5;
}

/* =============================================
   Regional Page — Hero
   ============================================= */
.region-hero {
  padding: var(--space-2xl) 0 var(--space-xl);
  background: linear-gradient(135deg, #EBF5FF 0%, #F0FAF8 100%);
}

.region-hero-title {
  font-size: var(--font-size-h2);
  font-weight: var(--font-weight-extrabold);
  color: var(--color-text);
  line-height: var(--line-height-tight);
  margin-bottom: var(--space-sm);
}

.region-hero-subtitle {
  font-size: var(--font-size-body);
  color: var(--color-text-light);
  max-width: 600px;
}

/* =============================================
   Regional Page — Content
   ============================================= */
.region-content {
  padding: var(--space-2xl) 0;
}

.region-content h2 {
  font-size: var(--font-size-h2);
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
  margin-bottom: var(--space-md);
}

.region-content p {
  color: var(--color-text-light);
  line-height: var(--line-height-normal);
  margin-bottom: var(--space-md);
  max-width: 800px;
}

.region-areas {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-top: var(--space-sm);
}

.region-area-tag {
  background: rgba(91, 163, 217, 0.12);
  color: var(--color-primary-dark);
  border-radius: 999px;
  padding: 0.3rem 0.9rem;
  font-size: var(--font-size-small);
  font-weight: var(--font-weight-medium);
}

.region-services {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.region-service-card {
  background: var(--color-card-bg);
  border-radius: var(--card-radius);
  box-shadow: var(--card-shadow);
  padding: var(--space-md);
}

.region-service-card h3 {
  font-size: var(--font-size-h3);
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
  margin-bottom: var(--space-xs);
}

.region-service-card p {
  color: var(--color-text-light);
  font-size: var(--font-size-small);
  line-height: var(--line-height-normal);
  margin: 0;
}

/* =============================================
   Footer Extensions
   ============================================= */
.footer-address {
  font-size: var(--font-size-small);
  color: rgba(245, 245, 244, 0.7);
  margin-top: var(--space-xs);
}

.footer-social {
  margin-top: var(--space-xs);
  font-size: var(--font-size-small);
}

.footer-social a {
  color: rgba(245, 245, 244, 0.8);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-social a:hover {
  color: var(--color-primary);
}

/* =============================================
   Responsive — FAQ & Regional
   ============================================= */
@media (max-width: 640px) {
  .faq-question {
    padding: var(--space-sm) var(--space-md);
    font-size: var(--font-size-body);
  }

  .faq-answer {
    padding: 0 var(--space-md) var(--space-sm);
  }

  .region-hero-title {
    font-size: clamp(1.5rem, 5vw, 2rem);
  }

  .region-services {
    grid-template-columns: 1fr;
  }
}

/* =============================================
   Service Regions Section — Main Landing
   ============================================= */
.service-regions {
  padding: var(--space-2xl) 0;
  background: linear-gradient(135deg, #EBF5FF 0%, #F0FAF8 100%);
}

.region-groups {
  max-width: 800px;
  margin: var(--space-xl) auto 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.region-group {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
}

.region-group-label {
  font-size: var(--font-size-small);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-light);
  white-space: nowrap;
  padding-top: 0.45rem;
  min-width: 48px;
}

.region-group-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
}

.region-tag-link {
  display: inline-flex;
  align-items: center;
  padding: 0.35rem 0.95rem;
  border-radius: 999px;
  border: 1.5px solid rgba(91, 163, 217, 0.3);
  background: var(--color-card-bg);
  color: var(--color-primary);
  font-size: var(--font-size-small);
  font-weight: var(--font-weight-medium);
  text-decoration: none;
  transition: background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.region-tag-link:hover {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(91, 163, 217, 0.3);
}

.region-tag-hash {
  opacity: 0.5;
  margin-right: 2px;
  font-size: 0.85em;
}

/* =============================================
   Nearby Regions — Regional Page Cross-links
   ============================================= */
.nearby-regions {
  padding: var(--space-xl) 0;
}

.nearby-regions .container {
  text-align: center;
}

.nearby-regions-title {
  font-size: var(--font-size-h3);
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

.nearby-regions-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-xs);
  margin-bottom: var(--space-md);
}

.nearby-regions-back {
  display: inline-block;
  color: var(--color-text-light);
  font-size: var(--font-size-small);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.nearby-regions-back:hover {
  color: var(--color-primary);
}

/* =============================================
   Footer — Regional Navigation
   ============================================= */
.footer-regions {
  margin-top: var(--space-sm);
  padding-top: var(--space-sm);
  border-top: 1px solid rgba(245, 245, 244, 0.15);
}

.footer-regions-title {
  font-size: var(--font-size-small);
  color: rgba(245, 245, 244, 0.5);
  font-weight: var(--font-weight-bold);
  margin-bottom: 0.25rem;
}

.footer-regions-links {
  font-size: var(--font-size-small);
  color: rgba(245, 245, 244, 0.5);
  line-height: 1.8;
}

.footer-regions-links a {
  color: rgba(245, 245, 244, 0.7);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-regions-links a:hover {
  color: var(--color-primary);
}

/* =============================================
   Responsive — Service Regions & Nearby & Footer
   ============================================= */
@media (max-width: 640px) {
  .region-group {
    flex-direction: column;
    gap: var(--space-xs);
  }

  .region-group-label {
    padding-top: 0;
  }

  .footer-regions-links {
    line-height: 2;
  }
}