/* ===== CSS Variables & Base Styles ===== */

/* Light Theme (Default) */
:root,
:root[data-theme="light"] {
  --primary-50:  #f0fdf4;
  --primary-100: #dcfce7;
  --primary-200: #bbf7d0;
  --primary-300: #86efac;
  --primary-400: #4ade80;
  --primary-500: #22c55e;
  --primary-600: #16a34a;
  --primary-700: #15803d;
  --primary-800: #166534;
  --primary-900: #14532d;

  --bg-primary:    #f0fdf4;
  --bg-card:       #ffffff;
  --bg-nav:        #ffffff;
  --bg-input:      #ffffff;
  --bg-hover:      #f0fdf4;
  --bg-modal:      rgba(0,0,0,0.4);

  --text-primary:  #1a2e1a;
  --text-secondary:#4a6a4a;
  --text-muted:    #6b8a6b;
  --text-inverse:  #ffffff;

  --border-color:  #dcfce7;
  --border-focus:  #22c55e;

  --shadow-sm:     0 1px 2px rgba(22,163,74,0.06);
  --shadow:        0 1px 3px rgba(22,163,74,0.08), 0 1px 2px rgba(22,163,74,0.04);
  --shadow-md:     0 4px 6px rgba(22,163,74,0.1), 0 2px 4px rgba(22,163,74,0.06);
  --shadow-lg:     0 10px 15px rgba(22,163,74,0.1), 0 4px 6px rgba(22,163,74,0.05);

  --radius-sm:  6px;
  --radius:     8px;
  --radius-md:  12px;
  --radius-lg:  16px;

  --transition:  0.2s ease;
}

/* Dark Theme */
:root[data-theme="dark"] {
  --primary-50:  #052e16;
  --primary-100: #064e3b;
  --primary-200: #065f46;
  --primary-300: #047857;
  --primary-400: #059669;
  --primary-500: #10b981;
  --primary-600: #34d399;
  --primary-700: #6ee7b7;
  --primary-800: #a7f3d0;
  --primary-900: #d1fae5;

  --bg-primary:    #0a1a0f;
  --bg-card:       #132a1a;
  --bg-nav:        #0f2216;
  --bg-input:      #1a3a22;
  --bg-hover:      #1a3a22;
  --bg-modal:      rgba(0,0,0,0.6);

  --text-primary:  #d1fae5;
  --text-secondary:#86efac;
  --text-muted:    #4ade80;
  --text-inverse:  #0a1a0f;

  --border-color:  #1a3a22;
  --border-focus:  #10b981;

  --shadow-sm:     0 1px 2px rgba(0,0,0,0.2);
  --shadow:        0 1px 3px rgba(0,0,0,0.3), 0 1px 2px rgba(0,0,0,0.2);
  --shadow-md:     0 4px 6px rgba(0,0,0,0.3), 0 2px 4px rgba(0,0,0,0.2);
  --shadow-lg:     0 10px 15px rgba(0,0,0,0.3), 0 4px 6px rgba(0,0,0,0.2);
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

a {
  color: var(--primary-600);
  text-decoration: none;
}

a:hover {
  color: var(--primary-700);
}

/* Utility */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.hidden {
  display: none !important;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border: none;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  line-height: 1.5;
}

.btn i {
  width: 16px;
  height: 16px;
}

.btn-primary {
  background-color: var(--primary-500);
  color: var(--text-inverse);
}

.btn-primary:hover {
  background-color: var(--primary-600);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background-color: var(--primary-100);
  color: var(--primary-700);
}

.btn-secondary:hover {
  background-color: var(--primary-200);
}

.btn-danger {
  background-color: #ef4444;
  color: #fff;
}

.btn-danger:hover {
  background-color: #dc2626;
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  padding: 6px 10px;
}

.btn-ghost:hover {
  background-color: var(--bg-hover);
  color: var(--text-primary);
}

.btn-sm {
  padding: 4px 10px;
  font-size: 13px;
}

.btn-lg {
  padding: 12px 24px;
  font-size: 16px;
}

.btn-icon {
  padding: 6px;
  border-radius: var(--radius);
  background: transparent;
  border: none;
  cursor: pointer;
  color: var(--text-secondary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
}

.btn-icon:hover {
  background-color: var(--bg-hover);
  color: var(--primary-500);
}

.btn-icon i {
  width: 20px;
  height: 20px;
}

/* Form Elements */
.form-group {
  margin-bottom: 16px;
}

.form-label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.form-input,
.form-select {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  font-size: 14px;
  color: var(--text-primary);
  background-color: var(--bg-input);
  transition: all var(--transition);
  outline: none;
}

.form-input:focus,
.form-select:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(34,197,94,0.15);
}

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

/* Toast Notifications */
.toast-container {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toast {
  padding: 12px 20px;
  border-radius: var(--radius);
  font-size: 14px;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 8px;
  animation: slideIn 0.3s ease;
  max-width: 360px;
}

.toast-success {
  background-color: var(--primary-500);
  color: var(--text-inverse);
}

.toast-error {
  background-color: #ef4444;
  color: #fff;
}

.toast-info {
  background-color: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

@keyframes slideIn {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

@keyframes slideOut {
  from { transform: translateX(0); opacity: 1; }
  to { transform: translateX(100%); opacity: 0; }
}

/* Modal */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--bg-modal);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  animation: fadeIn 0.2s ease;
}

.modal {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  width: 90%;
  max-width: 500px;
  max-height: 80vh;
  overflow-y: auto;
  animation: scaleIn 0.2s ease;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
  font-size: 18px;
  font-weight: 600;
}

.modal-body {
  padding: 24px;
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  padding: 16px 24px;
  border-top: 1px solid var(--border-color);
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes scaleIn {
  from { transform: scale(0.95); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

/* Loading Spinner */
.spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid var(--primary-200);
  border-top-color: var(--primary-500);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

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

/* Scrollbar */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--primary-300);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--primary-400);
}