:root {
  --primary: #124E3F;
  --primary-dark: #0B352A;
  --primary-light: #2A8B73;
  --accent-tint: #EEF7F4;
  --accent-mint: #E8F5F1;
  --danger: #D32F2F;
  --danger-bg: #FDF2F2;
  --warning-bg: #FFF8E7;
  --warning-text: #8C6D1F;
  --bg-page: #F8F9F8;
  --bg-card: #FFFFFF;
  --text-main: #191F28;
  --text-sub: #4E5968;
  --text-muted: #8B95A1;
  --border-light: #E5E8EB;
  --border-card: #ECEFF1;
  --shadow-sm: 0 2px 8px rgba(18, 78, 63, 0.04);
  --shadow-card: 0 4px 20px rgba(18, 78, 63, 0.06);
  --shadow-hover: 0 8px 30px rgba(18, 78, 63, 0.12);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-pill: 9999px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Pretendard Variable", Pretendard, "Apple SD Gothic Neo", "Segoe UI", Roboto, "Noto Sans KR", sans-serif;
  --max-width: 960px;
  --nav-max-width: 1120px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-page);
  color: var(--text-main);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color 0.15s ease;
}

a:hover {
  color: var(--primary-light);
}

/* Header & Nav */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-light);
}

.nav-container {
  max-width: var(--nav-max-width);
  margin: 0 auto;
  padding: 12px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary-dark);
  flex-shrink: 0;
  white-space: nowrap;
}

.brand-icon {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
  display: block;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
  flex-wrap: nowrap;
}

.nav-links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-sub);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: all 0.15s ease;
  white-space: nowrap;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--primary);
  background-color: var(--accent-tint);
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  background-color: #F0F4F2;
  border-radius: var(--radius-pill);
  padding: 3px;
  border: 1px solid var(--border-light);
  flex-shrink: 0;
}

.lang-btn {
  background: none;
  border: none;
  font-family: inherit;
  font-size: 0.82rem;
  font-weight: 600;
  padding: 5px 14px;
  border-radius: var(--radius-pill);
  cursor: pointer;
  color: var(--text-muted);
  transition: all 0.2s ease;
  white-space: nowrap;
  line-height: 1.2;
}

.lang-btn.active {
  background-color: var(--bg-card);
  color: var(--primary);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.08);
}

/* Main Container */
.main-wrapper {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 40px 20px 80px;
}

/* Page Header */
.page-header {
  margin-bottom: 32px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background-color: var(--accent-tint);
  color: var(--primary);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  margin-bottom: 12px;
}

.badge-danger {
  background-color: var(--danger-bg);
  color: var(--danger);
}

.page-title {
  font-size: 2.1rem;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}

.page-subtitle {
  font-size: 1.05rem;
  color: var(--text-sub);
}

.doc-meta {
  margin-top: 14px;
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.88rem;
  color: var(--text-muted);
}

/* Notice / Alert Box */
.notice-box {
  background-color: var(--accent-mint);
  border-left: 4px solid var(--primary);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  margin-bottom: 28px;
  font-size: 0.95rem;
  color: var(--primary-dark);
}

.notice-box.danger {
  background-color: var(--danger-bg);
  border-left-color: var(--danger);
  color: #8B1A1A;
}

.notice-box.warning {
  background-color: var(--warning-bg);
  border-left-color: #E5A000;
  color: var(--warning-text);
}

/* Section Card */
.section-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 28px;
  margin-bottom: 20px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.section-card:hover {
  box-shadow: var(--shadow-card);
}

.section-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.section-body {
  font-size: 0.98rem;
  color: var(--text-sub);
  line-height: 1.8;
}

.section-body p + p {
  margin-top: 12px;
}

.section-body ul, .section-body ol {
  padding-left: 24px;
  margin: 12px 0;
}

.section-body li {
  margin-bottom: 8px;
}

/* Table Style */
.data-table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 0.92rem;
}

.data-table th,
.data-table td {
  padding: 12px 14px;
  border: 1px solid var(--border-light);
  text-align: left;
}

.data-table th {
  background-color: var(--accent-tint);
  color: var(--primary-dark);
  font-weight: 600;
}

.data-table td {
  background-color: #FFFFFF;
}

/* Hub / Grid Cards (2x2 Balanced Layout) */
.hub-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-top: 24px;
}

.hub-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.hub-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
  border-color: var(--primary-light);
}

.hub-card-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background-color: var(--accent-tint);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 18px;
}

.hub-card-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 8px;
  line-height: 1.35;
}

.hub-card-desc {
  font-size: 0.92rem;
  color: var(--text-sub);
  line-height: 1.6;
  margin-bottom: 20px;
  flex-grow: 1;
}

.hub-card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--primary);
}

.hub-card-link::after {
  content: "→";
  transition: transform 0.15s ease;
}

.hub-card:hover .hub-card-link::after {
  transform: translateX(4px);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  cursor: pointer;
  text-decoration: none;
  border: none;
  transition: all 0.2s ease;
  white-space: nowrap;
}

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

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

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

.btn-danger:hover {
  background-color: #B71C1C;
  color: #FFFFFF;
}

.btn-outline {
  background-color: transparent;
  border: 1px solid var(--border-light);
  color: var(--text-sub);
}

.btn-outline:hover {
  background-color: var(--accent-tint);
  color: var(--primary);
  border-color: var(--primary);
}

/* Form Styles */
.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 8px;
}

.form-control {
  width: 100%;
  padding: 12px 16px;
  font-family: inherit;
  font-size: 0.95rem;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  background-color: #FAFAFA;
  transition: border-color 0.15s ease, background-color 0.15s ease;
}

.form-control:focus {
  outline: none;
  border-color: var(--primary);
  background-color: #FFFFFF;
  box-shadow: 0 0 0 3px rgba(18, 78, 63, 0.1);
}

textarea.form-control {
  min-height: 120px;
  resize: vertical;
}

/* FAQ Accordion */
.faq-item {
  border-bottom: 1px solid var(--border-light);
  padding: 18px 0;
}

.faq-item:first-child {
  padding-top: 0;
}

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

.faq-question {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 8px;
}

.faq-answer {
  font-size: 0.95rem;
  color: var(--text-sub);
  line-height: 1.7;
}

/* Footer */
.footer {
  border-top: 1px solid var(--border-light);
  background-color: #FFFFFF;
  padding: 40px 20px;
  font-size: 0.88rem;
  color: var(--text-muted);
}

.footer-container {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-nav a {
  color: var(--text-sub);
}

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

.footer-info {
  line-height: 1.6;
}

/* Responsive Styles */
@media (max-width: 960px) {
  .nav-container {
    flex-wrap: wrap;
    padding: 10px 16px;
    gap: 10px;
  }
  .brand-link {
    order: 1;
  }
  .lang-switch {
    order: 2;
  }
  .nav-links {
    order: 3;
    width: 100%;
    justify-content: flex-start;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding: 4px 0 2px;
    gap: 6px;
    scrollbar-width: none;
  }
  .nav-links::-webkit-scrollbar {
    display: none;
  }
  .nav-links a {
    font-size: 0.85rem;
    padding: 6px 12px;
    background-color: #F0F4F2;
    border-radius: var(--radius-pill);
  }
  .nav-links a.active {
    background-color: var(--accent-tint);
    color: var(--primary);
    font-weight: 600;
  }
}

@media (max-width: 680px) {
  .hub-grid {
    grid-template-columns: 1fr;
  }
  .page-title {
    font-size: 1.7rem;
  }
  .section-card {
    padding: 20px;
  }
}