/* =============================================
   AX교육플랫폼 - Main CSS Design System
   Charlie / 3분대장 - Task #8
   ============================================= */

/* === CSS Variables (Design Tokens) === */
:root {
  /* Brand Colors */
  --color-primary: #000000;
  --color-accent: #FF6B35;
  --color-green: #00C896;
  --color-bg: #F8F9FA;
  --color-white: #FFFFFF;
  --color-text: #1a1a2e;
  --color-text-muted: #6B7280;
  --color-border: #E5E7EB;

  /* Typography */
  --font-korean: 'Noto Sans KR', 'Inter', sans-serif;
  --font-inter: 'Inter', sans-serif;

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;
  --space-4xl: 80px;

  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 999px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.12), 0 2px 6px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 30px rgba(0,0,0,0.15), 0 4px 12px rgba(0,0,0,0.08);
  --shadow-xl: 0 20px 60px rgba(0,0,0,0.2);

  /* Transitions */
  --transition: 0.2s ease;
  --transition-slow: 0.4s ease;

  /* Z-index layers */
  --z-navbar: 1000;
  --z-modal: 2000;
  --z-toast: 9999;
}

/* === Dark Theme Variables === */
[data-theme="dark"] {
  --color-bg: #0f172a;
  --color-white: #1e293b;
  --color-text: #f1f5f9;
  --color-text-muted: #94a3b8;
  --color-border: #334155;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
  --shadow-lg: 0 10px 30px rgba(0,0,0,0.5);
}

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

/* === Base === */
html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-korean);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

ul, ol {
  list-style: none;
}

/* === Layout === */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.container-sm {
  max-width: 768px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.container-lg {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

/* === Navigation === */
.navbar {
  position: sticky;
  top: 0;
  z-index: var(--z-navbar);
  background: #000000;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  padding: 0 var(--space-lg);
  height: 64px;
  display: flex;
  align-items: center;
  transition: background var(--transition), box-shadow var(--transition);
}

.navbar.scrolled {
  box-shadow: 0 2px 20px rgba(0,0,0,0.4);
}

[data-theme="dark"] .navbar {
  background: #000000;
  border-bottom-color: rgba(255,255,255,0.06);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-lg);
}

.logo {
  text-decoration: none;
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.logo img {
  height: 40px;
  width: auto;
  display: block;
}

.logo-badge {
  background: var(--color-accent);
  color: white;
  font-size: 0.65rem;
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  font-weight: 800;
  letter-spacing: 0.5px;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: var(--space-xl);
  align-items: center;
}

.nav-links a {
  text-decoration: none;
  color: rgba(255,255,255,0.95);
  font-weight: 500;
  font-size: 0.95rem;
  transition: color var(--transition);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width var(--transition);
}

.nav-links a:hover {
  color: var(--color-accent);
}

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

/* === Dropdown Submenu === */
.nav-dropdown { position: relative; }

.nav-dropdown-toggle { display: flex; align-items: center; gap: 2px; white-space: nowrap; }

.nav-submenu {
  display: none;
  position: absolute;
  top: calc(100% + 12px);
  left: 50%;
  transform: translateX(-50%);
  background: #ffffff;
  border: 1px solid #E5E7EB;
  border-radius: 12px;
  box-shadow: 0 12px 32px rgba(45,27,105,0.14);
  min-width: 190px;
  padding: 8px;
  list-style: none;
  z-index: 1100;
}

.nav-submenu::before {
  content: '';
  position: absolute;
  top: -6px;
  left: 50%;
  transform: translateX(-50%);
  width: 12px;
  height: 12px;
  background: #ffffff;
  border-left: 1px solid #E5E7EB;
  border-top: 1px solid #E5E7EB;
  rotate: 45deg;
}

[data-theme="dark"] .nav-submenu {
  background: #1e293b;
  border-color: #334155;
}

[data-theme="dark"] .nav-submenu::before {
  background: #1e293b;
  border-color: #334155;
}

.nav-submenu li a {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  border-radius: 8px;
  color: #374151 !important;
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  transition: background 0.15s;
}

.nav-submenu li a::after { display: none !important; }

.nav-submenu li a:hover {
  background: #F3F4F6;
  color: #FF6B35 !important;
}

[data-theme="dark"] .nav-submenu li a {
  color: #e2e8f0 !important;
}

[data-theme="dark"] .nav-submenu li a:hover {
  background: #334155;
  color: #FF6B35 !important;
}

.nav-dropdown:hover .nav-submenu { display: block; }

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex-shrink: 0;
}

/* Hamburger Menu */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: var(--space-sm);
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: rgba(255,255,255,0.85);
  border-radius: 2px;
  transition: all var(--transition);
}

.hamburger.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* Mobile Menu */
.mobile-menu {
  display: none;
  position: fixed;
  inset: 0;
  top: 64px;
  background: #000000;
  z-index: 999;
  padding: var(--space-xl) var(--space-lg);
  flex-direction: column;
  gap: var(--space-md);
  border-top: 1px solid rgba(255,255,255,0.08);
}

.mobile-menu.open,
.mobile-menu.active {
  display: flex;
}

.mobile-menu a {
  font-size: 1.1rem;
  font-weight: 500;
  padding: var(--space-md) 0;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  color: rgba(255,255,255,0.95);
  transition: color var(--transition);
}

.mobile-menu a:hover {
  color: var(--color-accent);
}

/* === Buttons === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 10px 24px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  font-family: var(--font-korean);
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition);
  border: 2px solid transparent;
  white-space: nowrap;
  line-height: 1.4;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
}

.btn-primary {
  background: var(--color-accent);
  color: white;
  border-color: var(--color-accent);
}

.btn-primary:hover:not(:disabled) {
  background: #e55a27;
  border-color: #e55a27;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(255,107,53,0.35);
}

.btn-secondary {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

.btn-secondary:hover:not(:disabled) {
  background: #1e0a44;
  border-color: #1e0a44;
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  color: rgba(255,255,255,0.9);
  border-color: rgba(255,255,255,0.4);
}

.btn-outline:hover:not(:disabled) {
  background: rgba(255,255,255,0.12);
  color: white;
  border-color: rgba(255,255,255,0.7);
}

.btn-outline-white {
  background: transparent;
  color: white;
  border-color: rgba(255,255,255,0.7);
}

.btn-outline-white:hover:not(:disabled) {
  background: rgba(255,255,255,0.15);
  border-color: white;
  color: white;
}

.btn-outline-accent {
  background: transparent;
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.btn-outline-accent:hover:not(:disabled) {
  background: var(--color-accent);
  color: white;
}

.btn-green {
  background: var(--color-green);
  color: white;
  border-color: var(--color-green);
}

.btn-green:hover:not(:disabled) {
  background: #00b085;
  border-color: #00b085;
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  color: var(--color-text);
  border-color: transparent;
}

.btn-ghost:hover:not(:disabled) {
  background: var(--color-border);
}

.btn-danger {
  background: #EF4444;
  color: white;
  border-color: #EF4444;
}

.btn-danger:hover:not(:disabled) {
  background: #dc2626;
  border-color: #dc2626;
}

/* Button Sizes */
.btn-xs { padding: 4px 12px; font-size: 0.8rem; border-radius: 6px; }
.btn-sm { padding: 6px 16px; font-size: 0.875rem; }
.btn-md { padding: 10px 24px; font-size: 0.95rem; }
.btn-lg { padding: 14px 32px; font-size: 1.05rem; }
.btn-xl { padding: 18px 40px; font-size: 1.1rem; border-radius: var(--radius-md); }
.btn-block { width: 100%; justify-content: center; }

/* === Cards === */
.card {
  background: #ffffff;
  border-radius: var(--radius-md);
  box-shadow: 0 2px 12px rgba(45,27,105,0.10);
  padding: var(--space-lg);
  transition: box-shadow var(--transition), transform var(--transition);
  border: 1px solid rgba(45,27,105,0.12);
}
[data-theme="dark"] .card {
  background: #1e293b;
  border-color: rgba(255,255,255,0.08);
  box-shadow: 0 2px 12px rgba(0,0,0,0.3);
}

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

.card-hover:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.card-header {
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--color-border);
}

.card-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--space-xs);
}

.card-subtitle {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.card-body {
  flex: 1;
}

.card-footer {
  margin-top: var(--space-md);
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
}

.card-img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  margin: calc(-1 * var(--space-lg)) calc(-1 * var(--space-lg)) var(--space-lg);
  width: calc(100% + var(--space-lg) * 2);
}

/* Feature Card */
.feature-card {
  background: var(--color-white);
  border-radius: var(--radius-md);
  padding: var(--space-xl);
  border: 1px solid var(--color-border);
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-green));
  transform: scaleX(0);
  transition: transform var(--transition);
}

.feature-card:hover::before {
  transform: scaleX(1);
}

.feature-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.feature-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: var(--space-md);
}

.feature-icon-primary { background: rgba(45,27,105,0.08); }
.feature-icon-accent { background: rgba(255,107,53,0.1); }
.feature-icon-green { background: rgba(0,200,150,0.1); }

/* === Badges === */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  line-height: 1.4;
}

.badge-primary { background: rgba(45,27,105,0.1); color: var(--color-primary); }
.badge-accent, .badge-orange { background: rgba(255,107,53,0.12); color: var(--color-accent); }
.badge-green { background: rgba(0,200,150,0.12); color: #00a07a; }
.badge-gray { background: var(--color-border); color: var(--color-text-muted); }
.badge-red { background: rgba(239,68,68,0.12); color: #dc2626; }
.badge-blue { background: rgba(59,130,246,0.12); color: #2563eb; }
.badge-purple { background: rgba(139,92,246,0.12); color: #7c3aed; }
.badge-yellow { background: rgba(245,158,11,0.12); color: #d97706; }

/* Badge with border */
.badge-outline { background: transparent; border: 1px solid currentColor; }

/* Large badge */
.badge-lg {
  padding: 6px 14px;
  font-size: 0.875rem;
}

/* === Progress Bar === */
.progress-bar {
  background: var(--color-border);
  border-radius: var(--radius-full);
  height: 8px;
  overflow: hidden;
}

.progress-fill {
  background: linear-gradient(90deg, var(--color-accent), var(--color-green));
  height: 100%;
  border-radius: var(--radius-full);
  transition: width 0.6s ease;
}

.progress-fill-primary {
  background: var(--color-primary);
}

.progress-fill-green {
  background: var(--color-green);
}

.progress-sm { height: 4px; }
.progress-md { height: 8px; }
.progress-lg { height: 12px; }

.progress-label {
  display: flex;
  justify-content: space-between;
  margin-bottom: var(--space-xs);
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* === Form Elements === */
.form-group {
  margin-bottom: var(--space-lg);
}

.form-label {
  display: block;
  font-weight: 600;
  margin-bottom: var(--space-sm);
  color: var(--color-text);
  font-size: 0.95rem;
}

.form-label.required::after {
  content: ' *';
  color: var(--color-accent);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 12px 16px;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-family: var(--font-korean);
  color: var(--color-text);
  background: var(--color-white);
  transition: border-color var(--transition), box-shadow var(--transition);
  line-height: 1.5;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(255,107,53,0.15);
}

.form-input.error,
.form-select.error,
.form-textarea.error {
  border-color: #EF4444;
}

.form-input.success,
.form-select.success,
.form-textarea.success {
  border-color: var(--color-green);
}

.form-select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%236B7280' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 16px center;
  padding-right: 40px;
}

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

.form-hint {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-top: var(--space-xs);
}

.form-error {
  font-size: 0.8rem;
  color: #EF4444;
  margin-top: var(--space-xs);
}

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

/* Checkbox & Radio */
.form-check {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  cursor: pointer;
  margin-bottom: var(--space-sm);
}

.form-check input {
  width: 18px;
  height: 18px;
  accent-color: var(--color-accent);
  cursor: pointer;
}

.form-check label {
  cursor: pointer;
  font-size: 0.95rem;
}

/* Range Slider */
.form-range {
  width: 100%;
  height: 6px;
  accent-color: var(--color-accent);
  cursor: pointer;
}

/* File Upload */
.upload-area {
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-2xl) var(--space-lg);
  text-align: center;
  cursor: pointer;
  transition: all var(--transition);
  background: var(--color-bg);
}

.upload-area:hover,
.upload-area.dragover {
  border-color: var(--color-accent);
  background: rgba(255,107,53,0.04);
}

.upload-placeholder {
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

.upload-placeholder .upload-icon {
  font-size: 2.5rem;
  margin-bottom: var(--space-sm);
  display: block;
}

/* === Modal === */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  z-index: var(--z-modal);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-lg);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition), visibility var(--transition);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  max-width: 540px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  transform: translateY(20px);
  transition: transform var(--transition);
  position: relative;
}

.modal-overlay.active .modal {
  transform: translateY(0);
}

.modal-lg { max-width: 720px; }
.modal-sm { max-width: 400px; }
.modal-full { max-width: 960px; }

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--color-border);
}

.modal-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
}

.modal-close {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: none;
  background: var(--color-border);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  transition: background var(--transition);
  flex-shrink: 0;
}

.modal-close:hover {
  background: var(--color-text-muted);
  color: white;
}

.modal-footer {
  margin-top: var(--space-lg);
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-border);
  display: flex;
  gap: var(--space-sm);
  justify-content: flex-end;
}

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

.section-sm { padding: var(--space-2xl) 0; }
.section-lg { padding: 100px 0; }

.section-title {
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-primary);
  text-align: center;
  margin-bottom: var(--space-md);
  line-height: 1.3;
}

.section-subtitle {
  color: var(--color-text-muted);
  text-align: center;
  margin-bottom: var(--space-2xl);
  font-size: 1.05rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-2xl);
}

.section-tag {
  display: inline-block;
  background: rgba(255,107,53,0.1);
  color: var(--color-accent);
  padding: 4px 14px;
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 700;
  margin-bottom: var(--space-sm);
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

/* === Grid System === */
.grid {
  display: grid;
  gap: var(--space-lg);
}

.grid-1 { grid-template-columns: 1fr; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-5 { grid-template-columns: repeat(5, 1fr); }
.grid-6 { grid-template-columns: repeat(6, 1fr); }

.grid-auto { grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }
.grid-auto-sm { grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); }
.grid-auto-lg { grid-template-columns: repeat(auto-fill, minmax(340px, 1fr)); }

.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.gap-lg { gap: var(--space-lg); }
.gap-xl { gap: var(--space-xl); }

/* Flex utilities */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-end { justify-content: flex-end; }
.gap-xs { gap: var(--space-xs); }

/* === Toast Notifications === */
#toast-container {
  position: fixed;
  top: 80px;
  right: var(--space-lg);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  pointer-events: none;
}

.toast {
  padding: 14px 20px;
  border-radius: var(--radius-sm);
  background: var(--color-white);
  box-shadow: var(--shadow-lg);
  border-left: 4px solid;
  min-width: 280px;
  max-width: 380px;
  animation: slideInRight 0.3s ease;
  pointer-events: all;
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
}

.toast.removing {
  animation: slideOutRight 0.3s ease forwards;
}

.toast-success { border-color: var(--color-green); }
.toast-error { border-color: #EF4444; }
.toast-info { border-color: var(--color-accent); }
.toast-warning { border-color: #F59E0B; }

.toast-icon { font-size: 1.1rem; flex-shrink: 0; margin-top: 1px; }
.toast-content { flex: 1; }
.toast-title { font-weight: 600; font-size: 0.9rem; margin-bottom: 2px; }
.toast-message { font-size: 0.85rem; color: var(--color-text-muted); }

/* === Loading === */
.loading-spinner {
  display: inline-block;
  width: 24px;
  height: 24px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.loading-spinner-sm { width: 16px; height: 16px; border-width: 2px; }
.loading-spinner-lg { width: 40px; height: 40px; border-width: 4px; }

.loading-overlay {
  position: fixed;
  inset: 0;
  background: rgba(255,255,255,0.9);
  z-index: 3000;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
}

.skeleton {
  background: linear-gradient(90deg, var(--color-border) 25%, rgba(255,255,255,0.5) 50%, var(--color-border) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-sm);
}

/* === Footer === */
.footer {
  background: var(--color-primary);
  color: rgba(255,255,255,0.95);
  padding: 60px var(--space-lg) var(--space-xl);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-xl);
  max-width: 1200px;
  margin: 0 auto var(--space-2xl);
}

.footer-brand h3 {
  color: white;
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

.footer-brand p {
  font-size: 0.9rem;
  line-height: 1.7;
}

.footer-section h4 {
  color: white;
  font-weight: 700;
  margin-bottom: var(--space-md);
  font-size: 0.95rem;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.footer-links a {
  color: rgba(255,255,255,0.95);
  text-decoration: none;
  font-size: 0.875rem;
  transition: color var(--transition);
}

.footer-links a:hover {
  color: white;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  max-width: 1200px;
  margin: 0 auto;
  padding-top: var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  font-size: 0.875rem;
}

.footer-social {
  display: flex;
  gap: var(--space-sm);
}

.footer-social a {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255,255,255,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  transition: background var(--transition);
  text-decoration: none;
}

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

/* === Theme Toggle === */
#themeToggle {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 2px solid var(--color-border);
  background: var(--color-white);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  transition: all var(--transition);
}

#themeToggle:hover {
  border-color: var(--color-accent);
  transform: rotate(15deg);
}

/* === Help Button === */
.help-btn {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--color-accent);
  color: white;
  border: none;
  font-size: 1.4rem;
  font-weight: 700;
  cursor: pointer;
  box-shadow: var(--shadow-lg);
  transition: all var(--transition);
  z-index: 500;
  display: flex;
  align-items: center;
  justify-content: center;
}

.help-btn:hover {
  transform: scale(1.1);
  box-shadow: 0 8px 24px rgba(255,107,53,0.4);
}

/* === Avatar === */
.avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-primary);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
  flex-shrink: 0;
  overflow: hidden;
}

.avatar img { width: 100%; height: 100%; object-fit: cover; }
.avatar-sm { width: 32px; height: 32px; font-size: 0.75rem; }
.avatar-lg { width: 56px; height: 56px; font-size: 1.1rem; }
.avatar-xl { width: 80px; height: 80px; font-size: 1.5rem; }
.avatar-xxl { width: 100px; height: 100px; font-size: 2rem; }

.avatar-accent { background: var(--color-accent); }
.avatar-green { background: var(--color-green); }
.avatar-purple { background: #7c3aed; }
.avatar-blue { background: #2563eb; }

/* === Tabs === */
.tabs {
  border-bottom: 2px solid var(--color-border);
  display: flex;
  gap: 0;
  overflow-x: auto;
  scrollbar-width: none;
}

.tabs::-webkit-scrollbar { display: none; }

.tab-btn {
  padding: 12px 20px;
  border: none;
  background: none;
  color: var(--color-text-muted);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  font-family: var(--font-korean);
}

.tab-btn:hover {
  color: var(--color-primary);
}

.tab-btn.active {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

.tab-content {
  display: none;
  padding-top: var(--space-xl);
}

.tab-content.active {
  display: block;
}

/* === Table === */
.table-container {
  overflow-x: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

table {
  width: 100%;
  border-collapse: collapse;
  background: var(--color-white);
}

th {
  background: var(--color-bg);
  padding: 12px 16px;
  text-align: left;
  font-weight: 700;
  font-size: 0.875rem;
  color: var(--color-text-muted);
  border-bottom: 1px solid var(--color-border);
}

td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.95rem;
}

tr:last-child td { border-bottom: none; }
tr:hover td { background: var(--color-bg); }

/* === Stat Cards === */
.stat-card {
  background: var(--color-white);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  border: 1px solid var(--color-border);
  position: relative;
  overflow: hidden;
}

.stat-value {
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1.2;
}

.stat-label {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-top: var(--space-xs);
}

.stat-change {
  font-size: 0.8rem;
  font-weight: 600;
  margin-top: var(--space-xs);
}

.stat-change.up { color: var(--color-green); }
.stat-change.down { color: #EF4444; }

/* === Timeline === */
.timeline {
  position: relative;
  padding-left: 24px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 8px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-border);
}

.timeline-item {
  position: relative;
  margin-bottom: var(--space-xl);
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -20px;
  top: 4px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-accent);
  border: 2px solid white;
  box-shadow: 0 0 0 2px var(--color-accent);
}

.timeline-date {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-bottom: 4px;
}

.timeline-title {
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 4px;
}

.timeline-desc {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

/* === Alert / Notice === */
.alert {
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-sm);
  border: 1px solid;
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
}

.alert-info { background: rgba(59,130,246,0.06); border-color: rgba(59,130,246,0.2); color: #1d4ed8; }
.alert-success { background: rgba(0,200,150,0.06); border-color: rgba(0,200,150,0.2); color: #00a07a; }
.alert-warning { background: rgba(245,158,11,0.06); border-color: rgba(245,158,11,0.2); color: #d97706; }
.alert-error { background: rgba(239,68,68,0.06); border-color: rgba(239,68,68,0.2); color: #dc2626; }

/* === Divider === */
.divider {
  height: 1px;
  background: var(--color-border);
  margin: var(--space-lg) 0;
}

.divider-text {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin: var(--space-lg) 0;
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

.divider-text::before,
.divider-text::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--color-border);
}

/* === Text Utilities === */
.text-primary { color: var(--color-primary); }
.text-accent { color: var(--color-accent); }
.text-green { color: var(--color-green); }
.text-muted { color: var(--color-text-muted); }
.text-white { color: white; }
.text-sm { font-size: 0.875rem; }
.text-xs { font-size: 0.75rem; }
.text-lg { font-size: 1.1rem; }
.text-xl { font-size: 1.25rem; }
.text-2xl { font-size: 1.5rem; }
.text-3xl { font-size: 2rem; }
.text-center { text-align: center; }
.text-right { text-align: right; }
.font-bold { font-weight: 700; }
.font-black { font-weight: 900; }

/* === Spacing Utilities === */
.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }
.p-md { padding: var(--space-md); }
.p-lg { padding: var(--space-lg); }
.w-full { width: 100%; }
.hidden { display: none !important; }

/* === Animations === */
@keyframes slideInRight {
  from { transform: translateX(120%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

@keyframes slideOutRight {
  from { transform: translateX(0); opacity: 1; }
  to { transform: translateX(120%); opacity: 0; }
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

@keyframes countUp {
  from { opacity: 0; transform: scale(0.8); }
  to { opacity: 1; transform: scale(1); }
}

.animate-fadeIn { animation: fadeIn 0.5s ease; }
.animate-pulse { animation: pulse 2s infinite; }
.animate-bounce { animation: bounce 1s infinite; }

/* Intersection Observer Animation */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* === Responsive - Tablet (max 1024px) === */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-5 { grid-template-columns: repeat(3, 1fr); }
  .grid-6 { grid-template-columns: repeat(3, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

/* === Responsive - Mobile (max 768px) === */
@media (max-width: 768px) {
  :root { font-size: 15px; }

  .nav-links { display: none; }
  .nav-actions .btn:not(:last-child) { display: none; }
  .hamburger { display: flex; }

  .grid-2,
  .grid-3,
  .grid-4,
  .grid-5,
  .grid-6 { grid-template-columns: 1fr; }

  .grid-2.keep-2 { grid-template-columns: repeat(2, 1fr); }

  .section { padding: var(--space-2xl) 0; }
  .section-title { font-size: 1.6rem; }
  .section-subtitle { font-size: 0.95rem; }

  .footer-grid { grid-template-columns: 1fr; gap: var(--space-xl); }
  .footer-bottom { flex-direction: column; text-align: center; }

  .form-row { grid-template-columns: 1fr; }

  .modal {
    margin: var(--space-md);
    max-height: calc(100vh - 32px);
  }

  .modal-footer { flex-direction: column-reverse; }
  .modal-footer .btn { width: 100%; justify-content: center; }

  #toast-container { left: var(--space-md); right: var(--space-md); }
  .toast { min-width: unset; max-width: 100%; }

  .help-btn { bottom: 20px; right: 20px; width: 44px; height: 44px; font-size: 1.2rem; }
}

/* === Responsive - Small Mobile (max 480px) === */
@media (max-width: 480px) {
  .container { padding: 0 var(--space-md); }
  .btn-primary,
  .btn-outline,
  .btn-secondary { width: 100%; justify-content: center; margin-bottom: var(--space-xs); }
  .card { padding: var(--space-md); }
}

/* =============================================
   PREMIUM DESIGN ENHANCEMENTS v2
   고급스럽고 전문적인 디자인 + 모바일 최적화
   ============================================= */

/* === 텍스트 가독성 최대화 === */
:root {
  --color-text: #0f172a;          /* 거의 순수 블랙 — 최대 가독성 */
  --color-text-muted: #374151;    /* 보조 텍스트 (충분히 어두움) */
  --color-text-light: #6B7280;    /* 경량 힌트 텍스트 */
  --color-text-on-dark: rgba(255,255,255,0.92); /* 어두운 배경 위 텍스트 */
}

/* body 기본 텍스트 강화 */
body { color: var(--color-text); line-height: 1.7; }
[data-theme="dark"] body { color: #e2e8f0; }

/* ─────────────────────────────────────────────
   CARDS — 컬러 테두리 + 그라데이션 배경
   ───────────────────────────────────────────── */
.card {
  background: linear-gradient(160deg, #ffffff 0%, #f8fafd 100%);
  border: 1px solid rgba(45,27,105,0.1);
  border-top: 3px solid var(--color-accent);
  box-shadow: 0 2px 12px rgba(45,27,105,0.06);
}
.card:hover {
  border-top-color: var(--color-accent);
  border-color: rgba(255,107,53,0.2);
  box-shadow: 0 8px 32px rgba(45,27,105,0.11);
  transform: translateY(-2px);
}
[data-theme="dark"] .card {
  background: linear-gradient(160deg, #1e293b 0%, #192132 100%);
  border-color: rgba(255,255,255,0.07);
  border-top-color: var(--color-accent);
}
[data-theme="dark"] .card:hover { border-color: rgba(255,107,53,0.3); }

/* Feature Card */
.feature-card {
  background: linear-gradient(160deg, #ffffff 0%, #f8fafd 100%);
  border: 1px solid rgba(45,27,105,0.08);
  box-shadow: 0 2px 10px rgba(45,27,105,0.05);
}
.feature-card::before {
  height: 4px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-green));
}
.feature-card:hover {
  border-color: rgba(255,107,53,0.18);
  box-shadow: 0 14px 44px rgba(45,27,105,0.13);
}
[data-theme="dark"] .feature-card {
  background: linear-gradient(160deg, #1e293b 0%, #192132 100%);
  border-color: rgba(255,255,255,0.07);
}

/* Stat Card */
.stat-card {
  background: linear-gradient(160deg, #ffffff 0%, #f8fafd 100%);
  border: 1px solid rgba(45,27,105,0.09);
  border-bottom: 3px solid var(--color-green);
  box-shadow: 0 2px 10px rgba(45,27,105,0.05);
  transition: all 0.25s ease;
}
.stat-card:hover {
  border-color: rgba(0,200,150,0.3);
  box-shadow: 0 8px 28px rgba(45,27,105,0.1);
  transform: translateY(-3px);
}
[data-theme="dark"] .stat-card {
  background: linear-gradient(160deg, #1e293b 0%, #192132 100%);
  border-color: rgba(255,255,255,0.07);
  border-bottom-color: var(--color-green);
}
.stat-value {
  background: linear-gradient(135deg, var(--color-primary) 0%, #4A1D96 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
[data-theme="dark"] .stat-value {
  background: linear-gradient(135deg, #60a5fa, #93c5fd);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Card accent helpers */
.card-accent-left { border-left: 4px solid var(--color-accent) !important; border-top: 1px solid rgba(45,27,105,0.1) !important; }
.card-accent-green { border-top: 3px solid var(--color-green) !important; }

/* ─────────────────────────────────────────────
   BUTTONS — 그라데이션 + 글로우 + 컬러 테두리
   ───────────────────────────────────────────── */
.btn-primary {
  background: linear-gradient(135deg, #FF6B35 0%, #FF8C5A 100%);
  border: 2px solid #FF6B35;
  box-shadow: 0 2px 10px rgba(255,107,53,0.28);
  font-weight: 700;
  letter-spacing: 0.01em;
}
.btn-primary:hover:not(:disabled) {
  background: linear-gradient(135deg, #e55a27 0%, #FF6B35 100%);
  border-color: #e55a27;
  box-shadow: 0 6px 22px rgba(255,107,53,0.45);
  transform: translateY(-2px);
}

.btn-secondary {
  background: linear-gradient(135deg, #000000 0%, #4A1D96 100%);
  border: 2px solid #000000;
  box-shadow: 0 2px 10px rgba(45,27,105,0.22);
  font-weight: 700;
}
.btn-secondary:hover:not(:disabled) {
  background: linear-gradient(135deg, #1e0a44 0%, #000000 100%);
  box-shadow: 0 6px 22px rgba(45,27,105,0.38);
  transform: translateY(-2px);
}

.btn-green {
  background: linear-gradient(135deg, #00C896 0%, #00b085 100%);
  border: 2px solid #00C896;
  box-shadow: 0 2px 10px rgba(0,200,150,0.22);
  font-weight: 700;
}
.btn-green:hover:not(:disabled) {
  box-shadow: 0 6px 22px rgba(0,200,150,0.38);
  transform: translateY(-2px);
}

.btn-ghost {
  border: 1.5px solid rgba(45,27,105,0.15);
  color: var(--color-text);
}
.btn-ghost:hover:not(:disabled) {
  background: rgba(45,27,105,0.05);
  border-color: rgba(45,27,105,0.25);
}

/* ─────────────────────────────────────────────
   SECTIONS — 교대 배경 + 헤더 강화
   ───────────────────────────────────────────── */
.section-alt {
  background: linear-gradient(180deg, #eef3f9 0%, #f8fafd 100%);
}
[data-theme="dark"] .section-alt {
  background: linear-gradient(180deg, #0c1828 0%, #0f172a 100%);
}

.section-title {
  color: #000000;
  letter-spacing: -0.025em;
  font-weight: 900;
}
[data-theme="dark"] .section-title { color: #f1f5f9; }

.section-subtitle { color: var(--color-text-muted); font-size: 1.05rem; line-height: 1.75; }
[data-theme="dark"] .section-subtitle { color: #94a3b8; }

.section-tag {
  background: rgba(255,107,53,0.1);
  color: #d95a1f;
  border: 1px solid rgba(255,107,53,0.25);
  font-weight: 800;
  letter-spacing: 0.06em;
}

/* ─────────────────────────────────────────────
   BADGES — 컬러 테두리
   ───────────────────────────────────────────── */
.badge-primary  { background: rgba(45,27,105,0.07);    color: #000000;  border: 1px solid rgba(45,27,105,0.18); }
.badge-accent,
.badge-orange   { background: rgba(255,107,53,0.09);  color: #c95220;  border: 1px solid rgba(255,107,53,0.25); }
.badge-green    { background: rgba(0,200,150,0.09);   color: #00705c;  border: 1px solid rgba(0,200,150,0.25); }
.badge-blue     { background: rgba(59,130,246,0.09);  color: #1a44c4;  border: 1px solid rgba(59,130,246,0.25); }
.badge-purple   { background: rgba(139,92,246,0.09);  color: #5b21b6;  border: 1px solid rgba(139,92,246,0.25); }
.badge-red      { background: rgba(239,68,68,0.09);   color: #991b1b;  border: 1px solid rgba(239,68,68,0.25); }
.badge-yellow   { background: rgba(245,158,11,0.09);  color: #92400e;  border: 1px solid rgba(245,158,11,0.25); }
.badge-gray     { background: #f1f5f9; color: #475569; border: 1px solid #cbd5e1; }

/* ─────────────────────────────────────────────
   PROGRESS BAR
   ───────────────────────────────────────────── */
.progress-bar { background: rgba(45,27,105,0.07); border: 1px solid rgba(45,27,105,0.05); }
.progress-fill {
  background: linear-gradient(90deg, #FF6B35 0%, #00C896 100%);
  box-shadow: 0 0 8px rgba(255,107,53,0.3);
}
[data-theme="dark"] .progress-bar { background: rgba(255,255,255,0.1); }

/* ─────────────────────────────────────────────
   FORMS
   ───────────────────────────────────────────── */
.form-input, .form-select, .form-textarea {
  border: 1.5px solid rgba(45,27,105,0.16);
  background: #ffffff;
  color: #0f172a;
  font-size: 1rem;
}
.form-input:focus, .form-select:focus, .form-textarea:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(255,107,53,0.12);
}
[data-theme="dark"] .form-input,
[data-theme="dark"] .form-select,
[data-theme="dark"] .form-textarea {
  border-color: rgba(255,255,255,0.13);
  background: #1e293b;
  color: #f1f5f9;
}

/* ─────────────────────────────────────────────
   TABLE
   ───────────────────────────────────────────── */
th {
  background: linear-gradient(180deg, #f0f5fb 0%, #e8f0f9 100%);
  color: #1e3a5c;
  font-weight: 800;
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border-bottom: 2px solid rgba(45,27,105,0.12);
}
td { color: var(--color-text); }
tr:hover td { background: rgba(255,107,53,0.03); }
[data-theme="dark"] th {
  background: linear-gradient(180deg, #1e293b, #192132);
  color: #94a3b8;
  border-bottom-color: rgba(255,255,255,0.08);
}
[data-theme="dark"] td { color: #e2e8f0; }

/* ─────────────────────────────────────────────
   TOAST / MODAL / ALERT
   ───────────────────────────────────────────── */
.toast { border: 1px solid rgba(45,27,105,0.09); box-shadow: 0 8px 32px rgba(45,27,105,0.15); }
.modal { border: 1px solid rgba(45,27,105,0.1); box-shadow: 0 24px 80px rgba(45,27,105,0.22); }
[data-theme="dark"] .modal { background: #1e293b; border-color: rgba(255,255,255,0.08); }

.alert-info    { background: rgba(59,130,246,0.07);  border-color: rgba(59,130,246,0.28);  border-left: 4px solid #3B82F6; }
.alert-success { background: rgba(0,200,150,0.07);   border-color: rgba(0,200,150,0.28);   border-left: 4px solid #00C896; }
.alert-warning { background: rgba(245,158,11,0.07);  border-color: rgba(245,158,11,0.28);  border-left: 4px solid #F59E0B; }
.alert-error   { background: rgba(239,68,68,0.07);   border-color: rgba(239,68,68,0.28);   border-left: 4px solid #EF4444; }

/* ─────────────────────────────────────────────
   TEXT 가독성 최대화 — 전역 적용
   ───────────────────────────────────────────── */

/* 기본 body 텍스트 */
body { color: var(--color-text); }

/* 헤딩 — 밝은 배경 영역만 진하게 */
:is(.card, .feature-card, .stat-card, main, .section, section, article, .container) h1,
:is(.card, .feature-card, .stat-card, main, .section, section, article, .container) h2,
:is(.card, .feature-card, .stat-card, main, .section, section, article, .container) h3,
:is(.card, .feature-card, .stat-card, main, .section, section, article, .container) h4 { color: var(--color-primary); }

[data-theme="dark"] :is(.card, .feature-card, .stat-card, main, .section, section, article, .container) h1,
[data-theme="dark"] :is(.card, .feature-card, .stat-card, main, .section, section, article, .container) h2,
[data-theme="dark"] :is(.card, .feature-card, .stat-card, main, .section, section, article, .container) h3,
[data-theme="dark"] :is(.card, .feature-card, .stat-card, main, .section, section, article, .container) h4 { color: #f8fafc; }

/* 본문 p, li — 카드/섹션 내부만 */
:is(.card, .feature-card, .stat-card, main, .section, section, article) p,
:is(.card, .feature-card, .stat-card, main, .section, section, article) li { color: var(--color-text); }
[data-theme="dark"] :is(.card, .feature-card, .stat-card, main, .section, section, article) p,
[data-theme="dark"] :is(.card, .feature-card, .stat-card, main, .section, section, article) li { color: #e2e8f0; }

/* 다크 배경 섹션 (hero, 배너, 푸터 등) — 흰색 강제 유지 */
.hero h1, .hero h2, .hero h3, .hero h4, .hero h5,
.hero p, .hero li, .hero span:not(.highlight),
[class*="-hero"] h1, [class*="-hero"] h2, [class*="-hero"] h3,
[class*="-hero"] p, [class*="-hero"] li,
.page-hero h1, .page-hero h2, .page-hero p,
.about-hero h1, .about-hero p,
.qna-hero h1, .qna-hero p,
.sitemap-hero h1, .sitemap-hero p,
.cta-section h1, .cta-section h2, .cta-section p,
.contact-cta h1, .contact-cta h2, .contact-cta h3, .contact-cta p { color: inherit; }

/* 흐릿한 보조 텍스트도 최소 #374151 이상 */
.text-muted, .form-label, .card-meta, .badge-text,
small, .small { color: var(--color-text-muted); }
[data-theme="dark"] .text-muted,
[data-theme="dark"] .form-label,
[data-theme="dark"] small,
[data-theme="dark"] .small { color: #94a3b8; }

/* 카드 내부 텍스트 — 다크모드 */
[data-theme="dark"] .card,
[data-theme="dark"] .feature-card,
[data-theme="dark"] .stat-card { color: #e2e8f0; }

/* 푸터는 제외 (자체 흰색) */
.footer p, .footer li, .footer a { color: inherit; }

/* ─────────────────────────────────────────────
   모바일 최적화
   ───────────────────────────────────────────── */

/* 태블릿 (768px) */
@media (max-width: 768px) {
  .container, .container-sm, .container-lg { padding: 0 20px; }
  .section-title { font-size: 1.65rem; }
  .section-subtitle { font-size: 0.95rem; }
  .feature-card { padding: 20px; }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-3.force-1 { grid-template-columns: 1fr; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }

  /* 네비 링크 숨김 — 햄버거 사용 */
  .nav-links { display: none; }

  /* 터치 기기 hover 제거 */
  @media (hover: none) {
    .card:hover, .feature-card:hover, .stat-card:hover { transform: none; box-shadow: none; }
  }
}

/* 모바일 (480px) */
@media (max-width: 480px) {
  .container, .container-sm, .container-lg { padding: 0 16px; }

  /* 헤딩 크기 */
  h1 { font-size: 1.75rem !important; }
  h2 { font-size: 1.4rem !important; }
  .section-title { font-size: 1.4rem; }

  /* 카드 */
  .card, .feature-card, .stat-card { padding: 16px; }

  /* 버튼 */
  .hero-ctas { flex-direction: column; gap: 8px; }
  .hero-ctas .btn { width: 100%; justify-content: center; }
  .btn-lg { padding: 12px 20px; font-size: 0.95rem; }
  .btn-xl { padding: 13px 22px; font-size: 0.95rem; }

  /* 그리드 단열화 */
  .grid-4 { grid-template-columns: repeat(2, 1fr) !important; }
  .grid-2, .grid-3 { grid-template-columns: 1fr !important; }

  /* 섹션 여백 */
  .section { padding: 40px 0; }

  /* 폼 — iOS 자동 확대 방지 */
  .form-input, .form-select, .form-textarea { font-size: 16px !important; }
  .form-row { grid-template-columns: 1fr !important; }

  /* 모달 */
  .modal { padding: 20px 16px; margin: 16px; max-width: calc(100vw - 32px); }

  /* 히어로 */
  .hero-stats { gap: 16px; flex-wrap: wrap; }

  /* 드롭다운 서브메뉴 — 모바일에서 숨김 (모바일 메뉴 사용) */
  .nav-submenu { display: none !important; }

  /* 테이블 — 가로 스크롤 */
  table { display: block; overflow-x: auto; -webkit-overflow-scrolling: touch; }
}

/* ─────────────────────────────────────────────
   유틸리티
   ───────────────────────────────────────────── */
.border-accent  { border: 2px solid var(--color-accent) !important; }
.border-primary { border: 2px solid var(--color-primary) !important; }
.border-green   { border: 2px solid var(--color-green) !important; }
.bg-accent-soft  { background: rgba(255,107,53,0.06); }
.bg-primary-soft { background: rgba(45,27,105,0.05); }
.bg-green-soft   { background: rgba(0,200,150,0.06); }

/* === Print === */
@media print {
  .navbar, .footer, .help-btn, #toast-container { display: none !important; }
  body { background: white; }
  .card { box-shadow: none; border: 1px solid #ccc; }
}