/* ========================================
   CSS Variables & Design System
   ======================================== */

:root {
  --font-sans: 'Inter', sans-serif;
  --font-mono: 'Fira Code', monospace;
  
  /* Transitions */
  --transition-base: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

:root[data-theme='dark'] {
  --bg-primary: hsl(222, 47%, 11%);
  --bg-secondary: hsl(217, 33%, 17%);
  --bg-card: hsl(217, 33%, 17%);
  --text-primary: hsl(210, 40%, 98%);
  --text-secondary: hsl(215, 20%, 65%);
  --border-color: hsl(217, 33%, 24%);
  --primary-accent: hsl(199, 89%, 48%);
  --primary-hover: hsl(210, 98%, 62%);
  --success: hsl(142, 76%, 36%);
  --danger: hsl(0, 84%, 60%);
  --shadow: rgba(0, 0, 0, 0.5);
  --shadow-glow: rgba(14, 165, 233, 0.3);
  --code-path: hsl(142, 76%, 36%);
  --code-operator: hsl(215, 20%, 65%);
  --code-value: hsl(199, 89%, 48%);
}

:root[data-theme='light'] {
  --bg-primary: hsl(0, 0%, 100%);
  --bg-secondary: hsl(210, 40%, 96%);
  --bg-card: hsl(0, 0%, 100%);
  --text-primary: hsl(222, 47%, 11%);
  --text-secondary: hsl(215, 16%, 47%);
  --border-color: hsl(214, 32%, 91%);
  --primary-accent: hsl(199, 89%, 48%);
  --primary-hover: hsl(210, 98%, 62%);
  --success: hsl(142, 76%, 36%);
  --danger: hsl(0, 84%, 60%);
  --shadow: rgba(0, 0, 0, 0.1);
  --shadow-glow: rgba(14, 165, 233, 0.2);
  --code-path: hsl(142, 76%, 36%);
  --code-operator: hsl(215, 16%, 47%);
  --code-value: hsl(199, 89%, 48%);
}

/* ========================================
   Base Styles
   ======================================== */

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.app-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ========================================
   Header Styles
   ======================================== */

.app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--bg-card);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  box-shadow: 0 1px 3px var(--shadow);
}

.header-content {
  max-width: 1400px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

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

.brand-logo {
  width: 2rem;
  height: 2rem;
  border-radius: 0.5rem;
  background: linear-gradient(135deg, var(--primary-accent), var(--primary-hover));
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.875rem;
  color: var(--bg-primary);
  box-shadow: 0 0 20px var(--shadow-glow);
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 0.125rem;
}

.brand-name {
  font-size: 1.25rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary-accent), var(--primary-hover));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.brand-subtitle {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.header-actions {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  flex-wrap: wrap;
}

/* ========================================
   Main Layout
   ======================================== */

.main-layout {
  display: flex;
  flex: 1;
  overflow: hidden;
}

.builder-area {
  flex: 1;
  overflow-y: auto;
  padding: 2rem;
}

#builder-container {
  max-width: 1200px;
  margin: 0 auto;
}

/* ========================================
   Button Styles
   ======================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.625rem 1rem;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  border: none;
  border-radius: 0.5rem;
  cursor: pointer;
  transition: var(--transition-base);
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--primary-accent);
  color: var(--bg-primary);
  box-shadow: 0 1px 2px var(--shadow);
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  box-shadow: 0 4px 12px var(--shadow-glow);
}

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

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

.btn-icon {
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  position: relative;
}

.btn-full {
  width: 100%;
}

.btn-sm {
  padding: 0.375rem 0.75rem;
  font-size: 0.8125rem;
}

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

/* Theme Toggle Icons */
.sun-icon,
.moon-icon {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  transition: var(--transition-base);
}

[data-theme='dark'] .sun-icon {
  opacity: 1;
  transform: translate(-50%, -50%) rotate(0deg);
}

[data-theme='dark'] .moon-icon {
  opacity: 0;
  transform: translate(-50%, -50%) rotate(90deg);
}

[data-theme='light'] .sun-icon {
  opacity: 0;
  transform: translate(-50%, -50%) rotate(-90deg);
}

[data-theme='light'] .moon-icon {
  opacity: 1;
  transform: translate(-50%, -50%) rotate(0deg);
}

/* ========================================
   Rule Builder Styles
   ======================================== */

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 500px;
  text-align: center;
  gap: 1.5rem;
}

.empty-icon {
  width: 4rem;
  height: 4rem;
  border-radius: 50%;
  background-color: rgba(14, 165, 233, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary-accent);
}

.empty-state h3 {
  font-size: 1.5rem;
  font-weight: 600;
}

.empty-state p {
  color: var(--text-secondary);
  max-width: 400px;
}

.rule-group {
  background: linear-gradient(135deg, rgba(14, 165, 233, 0.05), rgba(14, 165, 233, 0.02));
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--primary-accent);
  border-radius: 0.75rem;
  padding: 1.25rem;
  margin-bottom: 1rem;
  animation: fadeIn 0.3s ease;
}

.rule-group-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.rule-group-children {
  padding-left: 1.5rem;
  border-left: 2px dashed var(--border-color);
  margin-left: 0.5rem;
  margin-top: 1rem;
}

.rule-group-children > * {
  margin-bottom: 0.75rem;
}

.rule-condition {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  padding: 1rem;
  animation: fadeIn 0.3s ease;
  transition: var(--transition-base);
  flex-wrap: wrap;
}

.rule-condition:hover {
  border-color: rgba(14, 165, 233, 0.5);
  box-shadow: 0 2px 8px var(--shadow-glow);
}

.rule-condition:hover .condition-actions {
  opacity: 1;
}

.condition-details {
  flex: 1;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.condition-path {
  color: var(--code-path);
  font-weight: 500;
}

.condition-operator {
  color: var(--code-operator);
}

.condition-value {
  color: var(--code-value);
}

.negate-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.5rem;
  background-color: var(--danger);
  color: white;
  border-radius: 0.25rem;
  font-size: 0.75rem;
  font-weight: 600;
  font-family: var(--font-sans);
}

.condition-actions {
  display: flex;
  gap: 0.5rem;
  opacity: 0;
  transition: var(--transition-base);
}

.action-button {
  padding: 0.375rem;
  min-width: 2rem;
  height: 2rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

/* ========================================
   Form Styles
   ======================================== */

.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  font-size: 0.875rem;
}

.form-input,
.form-select {
  width: 100%;
  padding: 0.625rem 0.875rem;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  transition: var(--transition-base);
}

.form-input:focus,
.form-select:focus {
  outline: none;
  border-color: var(--primary-accent);
  box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.1);
}

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

.form-input[type="text"] {
  font-family: var(--font-mono);
}

.form-group-checkbox {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.form-group-checkbox input[type="checkbox"] {
  width: 1.125rem;
  height: 1.125rem;
  cursor: pointer;
}

.form-group-checkbox label {
  margin: 0;
  cursor: pointer;
  font-size: 0.875rem;
}

.logic-select {
  width: 100px;
  padding: 0.5rem;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 0.375rem;
  color: var(--text-primary);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
}

/* ========================================
   Sidebar Styles
   ======================================== */

.sidebar {
  width: 450px;
  background-color: var(--bg-card);
  backdrop-filter: blur(12px);
  border-left: 1px solid var(--border-color);
  overflow-y: auto;
}

.sidebar-content {
  padding: 1.5rem;
}

.sidebar-section {
  margin-bottom: 2rem;
}

.sidebar-title {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
}

.sidebar-subtitle {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
  margin-top: 0;
}

.code-block {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  padding: 1rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  white-space: pre-wrap;
  word-wrap: break-word;
  max-height: 300px;
  overflow-y: auto;
  overflow-x: auto;
}

.code-textarea {
  width: 100%;
  min-height: 150px;
  padding: 0.875rem;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  resize: vertical;
  margin-bottom: 1rem;
  transition: var(--transition-base);
}

.code-textarea:focus {
  outline: none;
  border-color: var(--primary-accent);
  box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.1);
}

.endpoint-display {
  position: relative;
}

.btn-copy {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.375rem 0.625rem;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 0.375rem;
  color: var(--text-primary);
  font-size: 0.75rem;
  cursor: pointer;
  transition: var(--transition-base);
}

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

.btn-copy .check-icon {
  display: none;
}

.btn-copy.copied .copy-icon {
  display: none;
}

.btn-copy.copied .check-icon {
  display: block;
}

.btn-copy.copied {
  background-color: var(--success);
  color: white;
  border-color: var(--success);
}

/* ========================================
   Modal Styles
   ======================================== */

.modal-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.7);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  animation: fadeIn 0.2s ease;
  backdrop-filter: blur(4px);
}

.modal {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 0.75rem;
  width: 90%;
  max-width: 600px;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 20px 50px var(--shadow);
  animation: scaleIn 0.2s ease;
}

.modal-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-header h2 {
  margin: 0;
  font-size: 1.125rem;
  font-weight: 600;
}

.modal-close {
  background: none;
  border: none;
  font-size: 1.75rem;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 0;
  width: 2rem;
  height: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 0.375rem;
  transition: var(--transition-base);
}

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

.modal-content {
  padding: 1.5rem;
  overflow-y: auto;
  flex: 1;
}

.modal-code {
  max-height: 500px;
  margin-bottom: 1rem;
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
  padding-top: 1rem;
}

/* ========================================
   Footer Styles
   ======================================== */

.app-footer {
  border-top: 1px solid var(--border-color);
  background-color: var(--bg-card);
  backdrop-filter: blur(12px);
}

.footer-content {
  max-width: 1400px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.heart-icon {
  color: var(--danger);
  animation: pulse 2s ease-in-out infinite;
}

.footer-link {
  color: var(--primary-accent);
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition-base);
}

.footer-link:hover {
  color: var(--primary-hover);
  text-decoration: underline;
}

/* ========================================
   Animations
   ======================================== */

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

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

@keyframes pulse {
  0%, 100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.1);
  }
}

/* ========================================
   Responsive Styles
   ======================================== */

@media (max-width: 1024px) {
  .main-layout {
    flex-direction: column;
  }

  .sidebar {
    width: 100%;
    border-left: none;
    border-top: 1px solid var(--border-color);
  }

  .brand-subtitle {
    display: none;
  }
}

@media (max-width: 640px) {
  .header-content {
    padding: 1rem;
  }

  .brand-name {
    font-size: 1.125rem;
  }

  .builder-area {
    padding: 1rem;
  }

  .sidebar-content {
    padding: 1rem;
  }

  .modal {
    width: 95%;
  }

  .rule-group-header,
  .condition-actions {
    opacity: 1;
  }

  .rule-condition {
    flex-direction: column;
    align-items: flex-start;
  }

  .condition-actions {
    width: 100%;
    justify-content: flex-end;
  }
}