:root {
  /* Colors - Light Theme */
  --primary: #6366F1;
  --primary-hover: #4F46E5;
  --surface: rgba(255, 255, 255, 0.75);
  --surface-solid: #FFFFFF;
  --text-main: #111827;
  --text-muted: #6B7280;
  --border: rgba(229, 231, 235, 0.5);
  --border-solid: #E5E7EB;
  
  /* Status Colors */
  --status-draft: #6B7280;
  --status-draft-bg: rgba(107, 114, 128, 0.1);
  --status-submitted: #D97706;
  --status-submitted-bg: rgba(245, 158, 11, 0.15);
  --status-confirmed: #059669;
  --status-confirmed-bg: rgba(16, 185, 129, 0.15);
  --status-cancelled: #DC2626;
  --status-cancelled-bg: rgba(239, 68, 68, 0.15);

  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.02);
  --shadow-md: 0 8px 24px rgba(149, 157, 165, 0.15);
  --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.08);
  --shadow-primary: 0 8px 16px rgba(99, 102, 241, 0.25);
  
  /* Radii */
  --radius-sm: 8px;
  --radius: 16px;
  --radius-lg: 24px;
}

body.dark-theme {
  /* Colors - Dark Theme */
  --primary: #818CF8;
  --primary-hover: #6366F1;
  --surface: rgba(30, 41, 59, 0.6);
  --surface-solid: #1E293B;
  --text-main: #F8FAFC;
  --text-muted: #94A3B8;
  --border: rgba(255, 255, 255, 0.08);
  --border-solid: #334155;
  
  --status-draft: #94A3B8;
  --status-draft-bg: rgba(148, 163, 184, 0.1);
  --status-submitted: #FBBF24;
  --status-submitted-bg: rgba(251, 191, 36, 0.15);
  --status-confirmed: #34D399;
  --status-confirmed-bg: rgba(52, 211, 153, 0.15);
  --status-cancelled: #F87171;
  --status-cancelled-bg: rgba(248, 113, 113, 0.15);
  
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.5);
  --shadow-primary: 0 8px 16px rgba(129, 140, 248, 0.25);
}

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

/* Global Transition variables for smooth theme switching */
:root {
  --theme-transition: background-color 0.6s ease, border-color 0.6s ease, color 0.6s ease, fill 0.6s ease, stroke 0.6s ease, box-shadow 0.6s ease;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color: var(--text-main);
  line-height: 1.6;
  min-height: 100vh;
  transition: color 0.6s ease, background-color 0.6s ease;
  background-color: #ebedee;
}

/* Crossfade background gradients with pseudo elements */
body::before, body::after {
  content: '';
  position: fixed;
  top: 0; left: 0; width: 100%; height: 100%;
  pointer-events: none;
  transition: opacity 0.6s ease-in-out;
}

body::before {
  background-image: linear-gradient(135deg, #fdfbfb 0%, #ebedee 100%);
  z-index: -10;
  opacity: 1;
}

body::after {
  background-image: linear-gradient(135deg, #0F172A 0%, #1E1B4B 100%);
  z-index: -9;
  opacity: 0;
}

body.dark-theme::after {
  opacity: 1;
}

body.dark-theme {
  background-color: #0F172A;
}

/* Glassmorphism Utilities */
.glass {
  background: var(--surface);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  transition: var(--theme-transition);
}

/* Header */
.app-header {
  position: sticky;
  top: 0;
  z-index: 40;
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  background: var(--surface);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  padding: 1rem 0;
  transition: var(--theme-transition);
}

.header-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--primary);
  transition: transform 0.2s ease, color 0.6s ease;
}

.logo:hover {
  transform: scale(1.02);
}

.logo h1 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.02em;
  transition: color 0.6s ease;
}

.header-actions {
  display: flex;
  gap: 0.75rem;
  align-items: center;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.6rem 1.25rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.875rem;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1), background-color 0.6s ease, color 0.6s ease, border-color 0.6s ease;
  border: none;
  font-family: inherit;
  letter-spacing: 0.01em;
}

.btn:active {
  transform: scale(0.96);
}

.btn-primary {
  background-color: var(--primary);
  color: white;
  box-shadow: var(--shadow-primary);
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 10px 20px rgba(99, 102, 241, 0.3);
}

.btn-secondary {
  background-color: transparent;
  color: var(--text-main);
  border: 1px solid var(--border-solid);
}

.btn-secondary:hover {
  background-color: var(--border);
  border-color: var(--text-muted);
}

.btn-danger {
  background-color: transparent;
  color: var(--status-cancelled);
  border: 1px solid var(--status-cancelled);
}

.btn-danger:hover {
  background-color: var(--status-cancelled-bg);
}

.btn-success {
  background-color: transparent;
  color: var(--status-confirmed);
  border: 1px solid var(--status-confirmed);
}

.btn-success:hover {
  background-color: var(--status-confirmed-bg);
}

.btn-icon {
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.25rem;
  border-radius: 50%;
  transition: all 0.2s ease, color 0.6s ease, background-color 0.6s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

.btn-icon:hover {
  color: var(--text-main);
  background-color: var(--border);
}

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

/* Dashboard */
.dashboard {
  max-width: 1200px;
  margin: 3rem auto 2rem;
  padding: 0 1.5rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
}

.stat-card {
  padding: 1.5rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  position: relative;
  overflow: hidden;
  transition: transform 0.3s ease, box-shadow 0.3s ease, var(--theme-transition);
  background: var(--surface);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border);
}

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

.stat-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  transition: background-color 0.6s ease;
}

.stat-card.total::before { background-color: var(--primary); }
.stat-card.pending::before { background-color: var(--status-submitted); }
.stat-card.confirmed::before { background-color: var(--status-confirmed); }

.stat-card h3 {
  font-size: 0.875rem;
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: color 0.6s ease;
}

.stat-card p {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1;
  transition: color 0.6s ease;
}

/* Main Content */
.main-content {
  max-width: 1200px;
  margin: 0 auto 4rem;
  padding: 0 1.5rem;
}

.controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
  flex-wrap: wrap;
  gap: 1rem;
  padding: 1rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  background: var(--surface);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  transition: var(--theme-transition);
}

.filters, .sorting {
  display: flex;
  gap: 1rem;
}

.select-input {
  padding: 0.625rem 2.5rem 0.625rem 1rem;
  border: 1px solid var(--border-solid);
  border-radius: var(--radius-sm);
  background-color: var(--surface-solid);
  font-family: inherit;
  font-size: 0.875rem;
  color: var(--text-main);
  outline: none;
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%236B7280'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'%3E%3C/path%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  background-size: 1.2rem;
  transition: all 0.2s ease, var(--theme-transition);
  box-shadow: var(--shadow-sm);
}

body.dark-theme .select-input {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%2394A3B8'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'%3E%3C/path%3E%3C/svg%3E");
}

.select-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

/* Request List */
.request-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

.request-card {
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow-md);
  transition: transform 0.3s cubic-bezier(0.2, 0.8, 0.2, 1), var(--theme-transition);
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  border: 1px solid var(--border);
  position: relative;
  overflow: hidden;
  background: var(--surface);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.request-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, rgba(255,255,255,0.05) 0%, rgba(255,255,255,0) 100%);
  pointer-events: none;
}

.request-card:hover {
  transform: translateY(-4px) scale(1.005);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
}

.card-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.35rem;
  line-height: 1.3;
}

.card-subject {
  font-size: 0.875rem;
  color: var(--primary);
  font-weight: 600;
  letter-spacing: 0.02em;
  transition: color 0.6s ease;
}

/* Badges with dot indicator */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.35rem 0.85rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  white-space: nowrap;
  transition: var(--theme-transition);
}

.badge::before {
  content: '';
  display: block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  transition: background-color 0.6s ease;
}

.badge.status-Draft {
  background-color: var(--status-draft-bg);
  color: var(--status-draft);
}
.badge.status-Draft::before { background-color: var(--status-draft); }

.badge.status-Submitted {
  background-color: var(--status-submitted-bg);
  color: var(--status-submitted);
}
.badge.status-Submitted::before { background-color: var(--status-submitted); }

.badge.status-Confirmed {
  background-color: var(--status-confirmed-bg);
  color: var(--status-confirmed);
}
.badge.status-Confirmed::before { background-color: var(--status-confirmed); }

.badge.status-Cancelled {
  background-color: var(--status-cancelled-bg);
  color: var(--status-cancelled);
}
.badge.status-Cancelled::before { background-color: var(--status-cancelled); }

.card-details {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  font-size: 0.875rem;
  color: var(--text-muted);
  transition: color 0.6s ease;
}

.detail-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--surface-solid);
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: var(--theme-transition);
}

.card-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
  margin-top: 0.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
  transition: border-color 0.6s ease;
}

.empty-state {
  text-align: center;
  padding: 5rem 2rem;
  color: var(--text-muted);
  border-radius: var(--radius);
  border: 2px dashed var(--border);
  font-size: 1.125rem;
  font-weight: 500;
  background: var(--surface);
  backdrop-filter: blur(16px);
  transition: var(--theme-transition);
}

/* Modal */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 50;
  visibility: visible;
  opacity: 1;
  transition: visibility 0s, opacity 0.3s ease;
}

.modal.hidden {
  visibility: hidden;
  opacity: 0;
  pointer-events: none;
}

.modal-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.modal-content {
  position: relative;
  background: var(--surface-solid);
  width: 100%;
  max-width: 550px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  max-height: 90vh;
  z-index: 51;
  transform: scale(1);
  transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1), var(--theme-transition);
  border: 1px solid var(--border);
}

.modal.hidden .modal-content {
  transform: scale(0.95) translateY(20px);
}

.modal-header {
  padding: 1.5rem 2rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: border-color 0.6s ease;
}

.modal-header h2 {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

#request-form {
  padding: 2rem;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-main);
  letter-spacing: 0.01em;
  transition: color 0.6s ease;
}

.required {
  color: var(--status-cancelled);
  transition: color 0.6s ease;
}

.text-input {
  padding: 0.75rem 1rem;
  border: 1px solid var(--border-solid);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 0.95rem;
  color: var(--text-main);
  outline: none;
  transition: all 0.2s ease, var(--theme-transition);
  background-color: var(--surface-solid);
  box-shadow: inset 0 1px 2px rgba(0,0,0,0.02);
}

.text-input:focus {
  border-color: var(--primary);
  box-shadow: inset 0 1px 2px rgba(0,0,0,0.02), 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.text-input:disabled, .text-input[readonly] {
  background-color: var(--border-solid);
  cursor: not-allowed;
  color: var(--text-muted);
  opacity: 0.7;
}

textarea.text-input {
  resize: vertical;
  min-height: 120px;
  line-height: 1.5;
}

.form-errors {
  background-color: var(--status-cancelled-bg);
  color: var(--status-cancelled);
  padding: 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  white-space: pre-line;
  border-left: 4px solid var(--status-cancelled);
  transition: var(--theme-transition);
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 1rem;
  margin-top: 1rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  transition: border-color 0.6s ease;
}

/* Utilities */
.hidden {
  display: none !important;
}

/* Responsive */
@media (max-width: 640px) {
  .header-container {
    flex-direction: column;
    gap: 0.75rem;
    align-items: stretch;
  }

  .header-actions {
    gap: 0.5rem;
    flex-wrap: wrap;
    justify-content: flex-end;
  }

  /* Hide nickname on very small screens */
  .user-profile {
    display: none;
  }

  /* Make reset button text-only compact */
  #btn-reset span {
    display: none;
  }

  .controls {
    flex-direction: column;
    align-items: stretch;
  }

  .filters {
    flex-direction: column;
  }

  .sorting {
    flex-direction: column;
  }

  /* Make search full-width on mobile */
  #search-input {
    max-width: 100% !important;
    width: 100%;
  }

  .form-row {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .card-actions {
    flex-wrap: wrap;
  }

  .dashboard {
    margin-top: 1.5rem;
  }

  .modal-content {
    margin: 1rem;
    max-width: calc(100vw - 2rem);
  }

  .stat-card p {
    font-size: 2rem;
  }
}

/* Tablet adjustments */
@media (max-width: 900px) and (min-width: 641px) {
  .nickname-input {
    width: 80px;
  }

  #btn-reset span {
    display: none;
  }
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--border-solid);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* Toast Notifications */
#toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  z-index: 9999;
  pointer-events: none;
}
.toast {
  background: var(--surface-solid);
  color: var(--text-main);
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 500;
  font-size: 0.875rem;
  pointer-events: auto;
  transform: translateX(120%);
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.3s ease;
  opacity: 0;
}
.toast.show {
  transform: translateX(0);
  opacity: 1;
}
.toast.success { border-left: 4px solid var(--status-confirmed); }
.toast.error { border-left: 4px solid var(--status-cancelled); }

/* Inline Validation */
.error-text {
  color: var(--status-cancelled);
  font-size: 0.75rem;
  font-weight: 600;
  margin-top: 4px;
  display: flex;
  align-items: center;
  gap: 4px;
  animation: slideDown 0.2s ease-out forwards;
}
.input-error {
  border-color: var(--status-cancelled) !important;
  box-shadow: inset 0 1px 2px rgba(0,0,0,0.02), 0 0 0 3px rgba(239, 68, 68, 0.2) !important;
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* User Profile & Nickname */
.user-profile {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  border: 1px solid var(--border-solid);
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-sm);
  background: var(--surface-solid);
  transition: var(--theme-transition);
}

.nickname-input {
  border: none;
  background: transparent;
  outline: none;
  color: var(--text-main);
  font-family: inherit;
  font-size: 0.875rem;
  width: 110px;
  transition: color 0.6s ease;
}

.nickname-input::placeholder {
  color: var(--text-muted);
}