/* ============================================================
   CodeLens — Main Stylesheet
   Layout, theme, global styles
   ============================================================ */

/* --- Theme Custom Properties --- */
:root {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-tertiary: #21262d;
  --bg-overlay: rgba(1, 4, 9, 0.85);
  --accent: #58a6ff;
  --accent-hover: #79c0ff;
  --accent-glow: rgba(88, 166, 255, 0.25);
  --text-primary: #c9d1d9;
  --text-secondary: #8b949e;
  --text-muted: #484f58;
  --border: #30363d;
  --border-light: #21262d;
  --danger: #f85149;
  --warning: #d29922;
  --success: #3fb950;
  --info: #58a6ff;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', Consolas, monospace;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.5);
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 400ms ease;
}

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

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

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

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

a:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

/* --- Scrollbar --- */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
  background: var(--bg-tertiary);
  border-radius: 4px;
}

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

/* --- Typography --- */
h1, h2, h3, h4 {
  color: var(--text-primary);
  font-weight: 600;
  line-height: 1.3;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  user-select: none;
}

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

.btn:active {
  transform: scale(0.97);
}

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #ffffff;
  font-weight: 600;
}

.btn-primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  box-shadow: 0 0 20px var(--accent-glow);
}

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

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

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

.btn-danger:hover {
  background: rgba(248, 81, 73, 0.15);
}

.btn-ghost {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  padding: 8px;
}

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

/* --- Inputs --- */
.input,
.select {
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  transition: border-color var(--transition-fast);
  outline: none;
  width: 100%;
}

.input:focus,
.select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%238b949e' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 36px;
  cursor: pointer;
}

/* --- Top Bar --- */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
}

.topbar-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.topbar-logo {
  width: 32px;
  height: 32px;
}

.topbar-title {
  font-size: 1.25rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent), #a371f7);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.topbar-tagline {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-left: 4px;
  display: none;
}

@media (min-width: 768px) {
  .topbar-tagline {
    display: inline;
  }
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 4px;
}

/* --- Main Layout (Two Panels) --- */
.main-container {
  display: flex;
  flex: 1;
  min-height: 0;
}

.panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.panel-input {
  border-right: 1px solid var(--border);
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-secondary);
  flex-shrink: 0;
}

.panel-header h3 {
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
}

.panel-body {
  flex: 1;
  overflow-y: auto;
  position: relative;
}

/* --- Code Editor Area --- */
.code-editor {
  display: flex;
  height: 100%;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.65;
}

.line-numbers {
  padding: 16px 12px;
  text-align: right;
  user-select: none;
  white-space: pre;
  color: var(--text-muted);
  font-size: 0.85rem;
  line-height: 1.65;
  min-width: 48px;
  border-right: 1px solid var(--border);
  background: var(--bg-secondary);
  overflow: hidden;
  flex-shrink: 0;
}

.code-textarea {
  flex: 1;
  resize: none;
  border: none;
  outline: none;
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.65;
  padding: 16px;
  tab-size: 2;
  white-space: pre;
  overflow-wrap: normal;
  overflow-x: auto;
}

.code-textarea::placeholder {
  color: var(--text-muted);
}

/* --- Input Controls Bar --- */
.input-controls {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 20px;
  border-top: 1px solid var(--border);
  background: var(--bg-secondary);
  flex-shrink: 0;
}

.input-controls .select {
  width: auto;
  min-width: 160px;
}

.input-controls .btn-primary {
  margin-left: auto;
}

/* --- Spinner --- */
.spinner {
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  display: none;
}

.btn-primary.loading .spinner {
  display: inline-block;
}

.btn-primary.loading .btn-text {
  display: none;
}

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

/* --- Empty State (Report Panel) --- */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  padding: 40px;
  text-align: center;
  color: var(--text-muted);
}

.empty-state-icon {
  font-size: 4rem;
  margin-bottom: 16px;
  opacity: 0.4;
}

.empty-state h3 {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.empty-state p {
  font-size: 0.875rem;
  max-width: 300px;
  line-height: 1.5;
}

/* --- Settings Modal --- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: var(--bg-overlay);
  z-index: 500;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  width: 90%;
  max-width: 440px;
  box-shadow: var(--shadow-lg);
  transform: translateY(20px) scale(0.96);
  transition: transform var(--transition-normal);
}

.modal-overlay.active .modal {
  transform: translateY(0) scale(1);
}

.modal-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.modal-field {
  margin-bottom: 18px;
}

.modal-field label {
  display: block;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.modal-field .input-hint {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 6px;
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 24px;
}

/* --- History Sidebar --- */
.history-sidebar {
  position: fixed;
  top: 0;
  right: 0;
  width: 380px;
  max-width: 90vw;
  height: 100vh;
  background: var(--bg-secondary);
  border-left: 1px solid var(--border);
  z-index: 400;
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  transition: transform var(--transition-slow);
  box-shadow: var(--shadow-lg);
}

.history-sidebar.active {
  transform: translateX(0);
}

.history-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.history-header h3 {
  font-size: 1rem;
  font-weight: 600;
}

.history-list {
  flex: 1;
  overflow-y: auto;
  padding: 12px;
}

.history-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background var(--transition-fast);
  border: 1px solid transparent;
}

.history-item:hover {
  background: var(--bg-tertiary);
  border-color: var(--border);
}

.history-item-grade {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.8rem;
  flex-shrink: 0;
}

.history-item-info {
  flex: 1;
  min-width: 0;
}

.history-item-lang {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
}

.history-item-snippet {
  font-size: 0.8rem;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.history-item-time {
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-top: 2px;
}

.history-footer {
  padding: 12px;
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}

.history-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  color: var(--text-muted);
  font-size: 0.875rem;
  text-align: center;
  padding: 40px;
}

/* --- Toast Notifications --- */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 1000;
  display: flex;
  flex-direction: column-reverse;
  gap: 10px;
}

.toast {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 18px;
  border-radius: var(--radius-sm);
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-md);
  color: var(--text-primary);
  font-size: 0.85rem;
  min-width: 280px;
  max-width: 420px;
  animation: toastIn 0.3s ease forwards;
}

.toast.toast-exit {
  animation: toastOut 0.3s ease forwards;
}

.toast-error {
  border-color: var(--danger);
  background: rgba(248, 81, 73, 0.1);
}

.toast-success {
  border-color: var(--success);
  background: rgba(63, 185, 80, 0.1);
}

.toast-icon {
  font-size: 1.1rem;
  flex-shrink: 0;
}

@keyframes toastIn {
  from {
    opacity: 0;
    transform: translateY(12px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes toastOut {
  from {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
  to {
    opacity: 0;
    transform: translateY(12px) scale(0.95);
  }
}

/* --- History Backdrop --- */
.history-backdrop {
  position: fixed;
  inset: 0;
  background: var(--bg-overlay);
  z-index: 350;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.history-backdrop.active {
  opacity: 1;
  visibility: visible;
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .main-container {
    flex-direction: column;
  }

  .panel-input {
    border-right: none;
    border-bottom: 1px solid var(--border);
    max-height: 45vh;
  }

  .topbar {
    padding: 12px 16px;
  }

  .topbar-title {
    font-size: 1.1rem;
  }

  .input-controls {
    flex-wrap: wrap;
  }

  .input-controls .select {
    flex: 1;
    min-width: 120px;
  }

  .input-controls .btn-primary {
    flex: 1;
    justify-content: center;
    margin-left: 0;
  }
}

/* --- Utility --- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.hidden {
  display: none !important;
}