/* Design System & Theme Variables */
:root {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-card: rgba(255, 255, 255, 0.85);
  --bg-input: #f1f5f9;
  --text-main: #0f172a;
  --text-muted: #64748b;
  --text-inverse: #ffffff;
  --border-color: #e2e8f0;
  --border-hover: #cbd5e1;

  --accent-primary: #4f46e5;
  --accent-hover: #4338ca;
  --accent-gradient: linear-gradient(135deg, #6366f1 0%, #4f46e5 100%);
  --accent-glow: rgba(99, 102, 241, 0.25);
  
  --success-color: #10b981;
  --danger-color: #ef4444;
  --warning-color: #f59e0b;
  
  --card-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.03);
  --glass-border: 1px solid rgba(255, 255, 255, 0.6);
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;
  
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  --bg-primary: #0b0f17;
  --bg-secondary: #111827;
  --bg-card: rgba(17, 24, 39, 0.75);
  --bg-input: #1f2937;
  --text-main: #f3f4f6;
  --text-muted: #9ca3af;
  --text-inverse: #0f172a;
  --border-color: #1f2937;
  --border-hover: #374151;

  --accent-primary: #6366f1;
  --accent-hover: #818cf8;
  --accent-gradient: linear-gradient(135deg, #818cf8 0%, #6366f1 100%);
  --accent-glow: rgba(129, 140, 248, 0.25);
  
  --card-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.5), 0 8px 10px -6px rgba(0, 0, 0, 0.4);
  --glass-border: 1px solid rgba(255, 255, 255, 0.08);
}

/* Reset & Global Base */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  transition: background-color var(--transition-normal), border-color var(--transition-normal), color var(--transition-normal);
}

body {
  background-color: var(--bg-primary);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.6;
  overflow-x: hidden;
}

/* App Header & Navbar */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  background-color: var(--bg-card);
  border-bottom: var(--glass-border);
  padding: 1rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.25rem;
  font-weight: 700;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-decoration: none;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.theme-toggle-btn {
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  width: 42px;
  height: 42px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: transform var(--transition-fast), background-color var(--transition-fast);
}

.theme-toggle-btn:hover {
  transform: scale(1.08);
  border-color: var(--accent-primary);
}

.btn-nav-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-md);
  background-color: var(--bg-input);
  color: var(--text-main);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
  transition: all var(--transition-fast);
  border: 1px solid var(--border-color);
}

.btn-nav-link:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

/* Container & Layout */
.container {
  width: 100%;
  max-width: 800px;
  margin: 2.5rem auto;
  padding: 0 1.25rem;
  flex: 1;
}

.admin-container {
  max-width: 1200px;
}

/* Survey Header Card */
.survey-header {
  background: var(--bg-card);
  border: var(--glass-border);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2rem;
  box-shadow: var(--card-shadow);
  margin-bottom: 2rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.survey-header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 6px;
  background: var(--accent-gradient);
}

.survey-title {
  font-size: 1.85rem;
  font-weight: 800;
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
}

.survey-subtitle {
  color: var(--text-muted);
  font-size: 1rem;
  max-width: 600px;
  margin: 0 auto;
}

/* Question Cards */
.question-card {
  background: var(--bg-card);
  border: var(--glass-border);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--card-shadow);
  margin-bottom: 1.75rem;
  position: relative;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.question-card:focus-within,
.question-card:hover {
  border-color: rgba(99, 102, 241, 0.4);
}

.question-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--accent-gradient);
  color: #ffffff;
  font-size: 0.85rem;
  font-weight: 700;
  margin-right: 0.5rem;
}

.question-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.badge-multi {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.2rem 0.6rem;
  border-radius: 20px;
  background-color: var(--accent-glow);
  color: var(--accent-primary);
}

/* Choice Group (Radio & Checkbox) */
.options-group {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.option-label {
  display: flex;
  align-items: center;
  padding: 0.85rem 1.15rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background-color: var(--bg-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  user-select: none;
  font-weight: 500;
}

.option-label:hover {
  border-color: var(--accent-primary);
  background-color: var(--bg-input);
}

.option-label input[type="radio"],
.option-label input[type="checkbox"] {
  appearance: none;
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  border: 2px solid var(--text-muted);
  border-radius: 50%;
  margin-right: 0.85rem;
  outline: none;
  display: grid;
  place-content: center;
  transition: all var(--transition-fast);
}

.option-label input[type="checkbox"] {
  border-radius: 6px;
}

.option-label input[type="radio"]::before {
  content: "";
  width: 10px;
  height: 10px;
  border-radius: 50%;
  transform: scale(0);
  transition: 120ms transform ease-in-out;
  background-color: #ffffff;
}

.option-label input[type="checkbox"]::before {
  content: "✓";
  color: #ffffff;
  font-size: 12px;
  font-weight: bold;
  transform: scale(0);
  transition: 120ms transform ease-in-out;
}

.option-label input:checked {
  background: var(--accent-gradient);
  border-color: var(--accent-primary);
}

.option-label input:checked::before {
  transform: scale(1);
}

.option-label.checked {
  border-color: var(--accent-primary);
  background-color: var(--accent-glow);
}

/* Custom Text Inputs & Textarea */
.other-input-wrapper {
  margin-top: 0.75rem;
  display: none;
}

.other-input-wrapper.active {
  display: block;
  animation: fadeIn 0.3s ease;
}

.form-control {
  width: 100%;
  padding: 0.85rem 1rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background-color: var(--bg-secondary);
  color: var(--text-main);
  font-size: 0.95rem;
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-control:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

textarea.form-control {
  resize: vertical;
  min-height: 110px;
}

/* Recommendation Rating Bar (Q7) */
.nps-container {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 0.5rem;
}

.nps-buttons {
  display: grid;
  grid-template-columns: repeat(11, 1fr);
  gap: 0.4rem;
}

@media (max-width: 640px) {
  .nps-buttons {
    grid-template-columns: repeat(6, 1fr);
  }
}

.nps-btn {
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background-color: var(--bg-secondary);
  color: var(--text-main);
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.nps-btn:hover {
  border-color: var(--accent-primary);
  background-color: var(--bg-input);
}

.nps-btn.active {
  background: var(--accent-gradient);
  color: #ffffff;
  border-color: var(--accent-primary);
  box-shadow: 0 4px 12px var(--accent-glow);
}

.nps-labels {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* Submit Action Button */
.submit-btn-wrapper {
  margin-top: 2rem;
  margin-bottom: 3rem;
  text-align: center;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  width: 100%;
  max-width: 320px;
  padding: 1rem 2rem;
  border: none;
  border-radius: var(--radius-md);
  background: var(--accent-gradient);
  color: #ffffff;
  font-size: 1.1rem;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 10px 20px -5px var(--accent-glow);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 24px -5px var(--accent-glow);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

/* Toast & Modal */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
  padding: 1rem;
}

.modal-backdrop.show {
  opacity: 1;
  pointer-events: auto;
}

.modal-card {
  background: var(--bg-secondary);
  color: var(--text-main);
  border: var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  max-width: 500px;
  width: 100%;
  box-shadow: var(--card-shadow);
  text-align: center;
  transform: scale(0.9);
  transition: transform 0.3s ease;
}

.modal-backdrop.show .modal-card {
  transform: scale(1);
}

.modal-icon {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: rgba(16, 185, 129, 0.15);
  color: var(--success-color);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.5rem auto;
}

.modal-title {
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
}

.modal-desc {
  color: var(--text-muted);
  margin-bottom: 1.75rem;
}

/* Admin Dashboard Specific Styles */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.stat-card {
  background: var(--bg-card);
  border: var(--glass-border);
  backdrop-filter: blur(12px);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--card-shadow);
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.stat-icon {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  background: var(--accent-glow);
  color: var(--accent-primary);
  display: flex;
  align-items: center;
  justify-content: center;
}

.stat-val {
  font-size: 1.85rem;
  font-weight: 800;
  line-height: 1.2;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 600;
}

/* Table & Filters */
.admin-card {
  background: var(--bg-card);
  border: var(--glass-border);
  backdrop-filter: blur(12px);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--card-shadow);
  margin-bottom: 2rem;
}

.admin-header-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.table-wrapper {
  overflow-x: auto;
  width: 100%;
}

.custom-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.92rem;
}

.custom-table th,
.custom-table td {
  padding: 1rem 0.85rem;
  border-bottom: 1px solid var(--border-color);
}

.custom-table th {
  background-color: var(--bg-input);
  color: var(--text-muted);
  font-weight: 700;
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.05em;
}

.custom-table tbody tr:hover {
  background-color: var(--bg-input);
}

.action-btn-sm {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.4rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.action-btn-sm:hover {
  color: var(--accent-primary);
  background-color: var(--accent-glow);
}

.action-btn-sm.delete:hover {
  color: var(--danger-color);
  background-color: rgba(239, 68, 68, 0.15);
}

/* Footer */
.footer {
  text-align: center;
  padding: 2rem 1rem;
  color: var(--text-muted);
  font-size: 0.85rem;
  border-top: 1px solid var(--border-color);
  margin-top: auto;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}