/* Toss Design System - Custom Styles */

:root {
  /* Colors */
  --primary-blue: #3182F6;
  --primary-blue-hover: #1B64DA;
  --primary-blue-light: #EBF4FF;
  --text-primary: #191F28;
  --text-secondary: #4E5968;
  --text-tertiary: #8B95A1;
  --background: #FFFFFF;
  --background-secondary: #F9FAFB;
  --border: #E5E8EB;
  --error: #F04452;
  --success: #0BC07B;
  --shadow: rgba(0, 0, 0, 0.05);
  --shadow-hover: rgba(0, 0, 0, 0.1);

  /* Spacing */
  --container-max-width: 600px;
  --padding-mobile: 20px;
  --padding-desktop: 40px;
  --gap: 12px;

  /* Border Radius */
  --radius-sm: 10px;
  --radius-md: 12px;
  --radius-lg: 16px;

  /* Transitions */
  --transition: 0.2s ease;
}

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

body {
  font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  color: var(--text-primary);
  background-color: var(--background-secondary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: var(--padding-mobile);
  min-height: 100vh;
}

@media (min-width: 768px) {
  .container {
    padding: var(--padding-desktop);
  }
}

/* Header */
.header {
  margin-bottom: 32px;
  padding-top: 20px;
}

.title {
  font-size: 28px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.5px;
}

@media (min-width: 768px) {
  .title {
    font-size: 32px;
  }
}

/* Main Content */
.main-content {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

/* Input Section */
.input-section {
  background: var(--background);
  padding: 24px;
  border-radius: var(--radius-lg);
  box-shadow: 0 1px 3px var(--shadow);
}

.input-form {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

@media (min-width: 768px) {
  .input-form {
    flex-direction: row;
    align-items: flex-start;
  }
}

.input-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1;
}

.input-field {
  width: 100%;
  padding: 14px 16px;
  font-size: 16px;
  color: var(--text-primary);
  background: var(--background);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  outline: none;
  transition: all var(--transition);
  font-family: inherit;
}

.input-field::placeholder {
  color: var(--text-tertiary);
}

.input-field:focus {
  border-color: var(--primary-blue);
  box-shadow: 0 0 0 3px var(--primary-blue-light);
}

.input-field-small {
  font-size: 14px;
  padding: 12px 16px;
}

/* Buttons */
.btn-primary {
  padding: 14px 24px;
  font-size: 16px;
  font-weight: 600;
  color: white;
  background: var(--primary-blue);
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
  font-family: inherit;
}

.btn-primary:hover:not(:disabled) {
  background: var(--primary-blue-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(49, 130, 246, 0.3);
}

.btn-primary:active:not(:disabled) {
  transform: translateY(0);
}

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-secondary {
  padding: 12px 20px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--background-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
  font-family: inherit;
}

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

.btn-delete {
  padding: 8px 16px;
  font-size: 14px;
  font-weight: 500;
  color: var(--error);
  background: transparent;
  border: 1px solid var(--error);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
  font-family: inherit;
}

.btn-delete:hover {
  background: var(--error);
  color: white;
}

.btn-edit {
  padding: 8px 16px;
  font-size: 14px;
  font-weight: 500;
  color: var(--primary-blue);
  background: transparent;
  border: 1px solid var(--primary-blue);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
  font-family: inherit;
}

.btn-edit:hover {
  background: var(--primary-blue);
  color: white;
}

/* Todo List Section */
.todo-list-section {
  min-height: 300px;
}

/* Loading State */
.loading-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 60px 20px;
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border);
  border-top-color: var(--primary-blue);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.loading-text {
  margin-top: 16px;
  font-size: 14px;
  color: var(--text-tertiary);
}

/* Empty State */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 60px 20px;
  text-align: center;
}

.empty-icon {
  width: 64px;
  height: 64px;
  color: var(--text-tertiary);
  opacity: 0.5;
  margin-bottom: 16px;
}

.empty-text {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.empty-subtext {
  font-size: 14px;
  color: var(--text-tertiary);
}

/* Todo List */
.todo-list {
  display: flex;
  flex-direction: column;
  gap: var(--gap);
}

.todo-item {
  background: var(--background);
  padding: 20px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  box-shadow: 0 1px 3px var(--shadow);
  transition: all var(--transition);
}

.todo-item:hover {
  box-shadow: 0 4px 12px var(--shadow-hover);
  transform: translateY(-2px);
}

.todo-content {
  margin-bottom: 16px;
}

.todo-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 6px;
  word-break: break-word;
}

.todo-details {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.5;
  word-break: break-word;
}

.todo-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

/* Modal */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  animation: fadeIn 0.2s ease;
}

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

.modal-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
}

.modal-content {
  position: relative;
  background: var(--background);
  border-radius: var(--radius-lg);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  max-width: 500px;
  width: 100%;
  animation: slideUp 0.2s ease;
}

@keyframes slideUp {
  from {
    transform: translateY(20px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 24px 16px;
  border-bottom: 1px solid var(--border);
}

.modal-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
}

.modal-close {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-tertiary);
  padding: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

.modal-close:hover {
  background: var(--background-secondary);
  color: var(--text-primary);
}

.modal-body {
  padding: 24px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group:last-child {
  margin-bottom: 0;
}

.form-label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.modal-actions {
  display: flex;
  gap: 12px;
  margin-top: 24px;
}

.modal-actions button {
  flex: 1;
}

/* Toast Notification */
.toast {
  position: fixed;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--text-primary);
  color: white;
  padding: 16px 24px;
  border-radius: var(--radius-md);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
  z-index: 2000;
  max-width: 90%;
  width: auto;
  min-width: 200px;
  text-align: center;
  transition: transform var(--transition);
}

.toast.show {
  transform: translateX(-50%) translateY(0);
}

.toast.error {
  background: var(--error);
}

.toast.success {
  background: var(--success);
}

#toast-message {
  font-size: 14px;
  font-weight: 500;
}

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

/* Responsive */
@media (max-width: 767px) {
  .btn-primary {
    width: 100%;
  }

  .todo-actions {
    justify-content: stretch;
  }

  .btn-edit,
  .btn-delete {
    flex: 1;
  }
}

/* Accessibility */
.input-field:focus,
.btn-primary:focus,
.btn-secondary:focus,
.btn-edit:focus,
.btn-delete:focus {
  outline: 2px solid var(--primary-blue);
  outline-offset: 2px;
}

/* Smooth Scrolling */
html {
  scroll-behavior: smooth;
}