/**
 * Chess Coach - Custom CSS Styles
 * Organized with CSS custom properties and component-based structure
 */

/* ===================================
   CSS CUSTOM PROPERTIES (Design Tokens)
   =================================== */
:root {
  /* Colors - High Contrast Terminal Theme */
  --color-bg-primary: #000000;
  --color-bg-secondary: #0a0a0a;
  --color-bg-tertiary: #1a1a1a;
  --color-surface: #262626;
  --color-surface-hover: #3a3a3a;
  --color-surface-active: #4a4a4a;
  --color-border: #404040;
  --color-border-subtle: #262626;
  --color-text-primary: #d4d4d4;
  --color-text-secondary: #a3a3a3;
  --color-text-muted: #737373;
  --color-accent: #22c55e;
  --color-accent-hover: #16a34a;
  --color-accent-subtle: rgba(34, 197, 94, 0.1);
  --color-accent-border: rgba(34, 197, 94, 0.2);
  
  /* Chess Board Colors */
  --color-square-light: #525252;
  --color-square-dark: #262626;
  --color-square-selected: #262626;
  --color-square-highlight: #3a3a3a;
  --color-ring-selected: #16a34a;
  --color-ring-hover: rgba(34, 197, 94, 0.3);
  --color-ring-valid: rgba(34, 197, 94, 0.5);
  
  /* Typography */
  --font-family-primary: 'Fira Code', monospace;
  --font-size-xs: 10px;
  --font-size-sm: 12px;
  --font-size-base: 14px;
  --font-size-lg: 16px;
  --font-line-height-tight: 1.25;
  --font-line-height-normal: 1.5;
  
  /* Spacing */
  --spacing-1: 0.25rem;
  --spacing-2: 0.5rem;
  --spacing-3: 0.75rem;
  --spacing-4: 1rem;
  --spacing-6: 1.5rem;
  --spacing-8: 2rem;
  
  /* Layout */
  --border-radius-sm: 2px;
  --border-radius-md: 4px;
  --border-radius-lg: 8px;
  --transition-fast: 150ms ease-in-out;
  --transition-normal: 250ms ease-in-out;
  
  /* Scrollbar */
  --scrollbar-width: 6px;
  --scrollbar-track: #1a1a1a;
  --scrollbar-thumb: #404040;
  --scrollbar-thumb-hover: #555;
}

/* ===================================
   BASE STYLES
   =================================== */
* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  height: 100%;
}

body {
  font-family: var(--font-family-primary);
  background-color: var(--color-bg-primary);
  color: var(--color-text-primary);
  margin: 0;
  padding: 0;
  overflow: hidden;
  line-height: var(--font-line-height-normal);
}

#app {
  width: 100%;
  height: 100%;
}

/* ===================================
   SCROLLBAR STYLES
   =================================== */
.custom-scrollbar {
  scrollbar-width: thin;
  scrollbar-color: var(--scrollbar-thumb) var(--scrollbar-track);
}

.custom-scrollbar::-webkit-scrollbar {
  width: var(--scrollbar-width);
  height: var(--scrollbar-width);
}

.custom-scrollbar::-webkit-scrollbar-track {
  background: var(--scrollbar-track);
}

.custom-scrollbar::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb);
  border-radius: var(--border-radius-sm);
}

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

/* ===================================
   LOADING SCREEN
   =================================== */
.loading {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  height: 100vh;
  font-size: var(--font-size-lg);
  gap: var(--spacing-6);
}

.loading-spinner {
  width: 48px;
  height: 48px;
  border: 3px solid var(--color-border);
  border-top: 3px solid var(--color-accent);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.loading-text {
  color: var(--color-text-primary);
  font-family: var(--font-family-primary);
  text-align: center;
}

.loading-status {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-top: var(--spacing-2);
  text-align: center;
  max-width: 300px;
}

.loading-error {
  color: #ef4444;
  font-size: var(--font-size-sm);
  text-align: center;
  max-width: 300px;
  padding: var(--spacing-3);
  border: 1px solid #ef4444;
  border-radius: var(--border-radius-md);
  background-color: rgba(239, 68, 68, 0.1);
}

.loading-hidden {
  display: none;
}

.loading-progress {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-2);
}

.loading-steps {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-1);
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

.loading-step {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
}

.loading-step-icon {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: var(--color-border);
}

.loading-step.active .loading-step-icon {
  background-color: var(--color-accent);
  animation: pulse 1s infinite;
}

.loading-step.complete .loading-step-icon {
  background-color: var(--color-accent);
}

.loading-step-text {
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ===================================
   CHESS BOARD
   =================================== */
.chess-board {
  display: flex;
  flex-direction: column;
  width: 100%;
  height: 100%;
  aspect-ratio: 1;
}

.chess-board-row {
  display: flex;
  flex: 1;
  width: 100%;
}

.chess-square {
  position: relative;
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast) ease-in-out;
  aspect-ratio: 1;
}

.chess-square.light {
  background-color: var(--color-square-light);
}

.chess-square.dark {
  background-color: var(--color-square-dark);
}

.chess-square.selected {
  background-color: var(--color-square-selected);
  box-shadow: inset 0 0 0 4px var(--color-ring-selected);
}

.chess-square.last-move {
  background-color: var(--color-square-highlight);
}

.chess-square.valid-move {
  cursor: pointer;
}

.chess-square.valid-move:hover {
  box-shadow: inset 0 0 0 2px var(--color-ring-hover);
}

.chess-square.valid-move-empty::after {
  content: '';
  position: absolute;
  width: 8px;
  height: 8px;
  background-color: var(--color-ring-valid);
  border-radius: 50%;
}

.chess-square.valid-move-capture::before {
  content: '';
  position: absolute;
  inset: 4px;
  border: 2px solid var(--color-ring-valid);
  border-radius: var(--border-radius-sm);
}

/* ===================================
   BOARD COORDINATES
   =================================== */
.coordinate-rank {
  position: absolute;
  left: 2px;
  top: 0;
  font-size: var(--font-size-xs);
  font-weight: bold;
  color: var(--color-text-muted);
  pointer-events: none;
  user-select: none;
}

.coordinate-file {
  position: absolute;
  right: 2px;
  bottom: 0;
  font-size: var(--font-size-xs);
  font-weight: bold;
  color: var(--color-text-muted);
  pointer-events: none;
  user-select: none;
}

.coordinate-rank.on-dark {
  color: var(--color-text-muted);
}

.coordinate-rank.on-light {
  color: var(--color-text-secondary);
}

.coordinate-file.on-dark {
  color: var(--color-text-muted);
}

.coordinate-file.on-light {
  color: var(--color-text-secondary);
}

/* ===================================
   CHESS PIECES
   =================================== */
.chess-piece {
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
  transition: all var(--transition-fast) ease-in-out;
}

.chess-piece.moving {
  transform: scale(1.05);
  z-index: 2;
}

.chess-piece.reverting {
  transition: all var(--transition-normal) ease-in-out;
}

.chess-piece svg {
  width: 100%;
  height: 100%;
}

/* ===================================
   PROCESSING INDICATORS
   =================================== */
.processing-indicator {
  position: fixed;
  top: var(--spacing-4);
  right: var(--spacing-4);
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  padding: var(--spacing-2) var(--spacing-3);
  background-color: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-md);
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  z-index: 1000;
  opacity: 0;
  transition: opacity var(--transition-fast) ease-in-out;
}

.processing-indicator.visible {
  opacity: 1;
}

.processing-dot {
  width: 8px;
  height: 8px;
  background-color: var(--color-accent);
  border-radius: 50%;
  animation: pulse 1.5s infinite;
}

.processing-text {
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ===================================
   ANALYSIS PANEL
   =================================== */
.analysis-panel {
  background-color: var(--color-bg-primary);
  color: var(--color-text-secondary);
  height: 100%;
  display: flex;
  flex-direction: column;
  font-family: var(--font-family-primary);
  font-size: var(--font-size-sm);
  position: relative;
  border-left: 1px solid var(--color-border-subtle);
  overflow: hidden;
}

.analysis-header {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-1);
  padding: var(--spacing-2);
  border-bottom: 1px solid var(--color-border);
  background-color: var(--color-bg-secondary);
}

.analysis-header-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-2);
}

.analysis-title {
  font-weight: bold;
  color: var(--color-text-primary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: var(--font-size-xs);
}

.analysis-controls {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  flex-wrap: wrap;
  justify-content: flex-end;
}

.analysis-status {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  font-size: var(--font-size-xs);
}

.status-label {
  color: var(--color-text-muted);
  text-transform: uppercase;
}

.status-value {
  color: var(--color-text-primary);
  font-weight: bold;
  max-width: 200px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.engine-status.engine-ok .status-value {
  color: var(--color-accent);
}

.engine-status.engine-error .status-value {
  color: #ef4444;
}

.engine-status.engine-unavailable .status-value {
  color: #eab308;
}

/* ===================================
   TOKEN PANEL
   =================================== */
.btn-token {
  white-space: nowrap;
}

.token-status .status-value {
  max-width: none;
}

.token-panel {
  border: 1px solid var(--color-border);
  background-color: var(--color-bg-tertiary);
  padding: var(--spacing-2);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-2);
}

.token-panel-text {
  color: var(--color-text-muted);
  font-size: var(--font-size-xs);
}

.token-form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-2);
}

.token-field {
  display: grid;
  grid-template-columns: 72px 1fr auto;
  gap: var(--spacing-2);
  align-items: center;
}

.token-label {
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  color: var(--color-text-secondary);
}

.token-input {
  width: 100%;
  font-size: var(--font-size-xs);
  padding: 4px 6px;
  border: 1px solid var(--color-border);
  background-color: var(--color-bg-primary);
  color: var(--color-text-primary);
  font-family: var(--font-family-primary);
}

.token-input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 1px var(--color-accent-border);
}

.token-actions {
  display: flex;
  justify-content: flex-end;
}

/* ===================================
   CONTROL BUTTONS
   =================================== */
.btn {
  font-size: var(--font-size-xs);
  border: 1px solid var(--color-border);
  padding: 2px 6px;
  text-transform: uppercase;
  transition: all var(--transition-fast) ease-in-out;
  cursor: pointer;
  background-color: transparent;
  font-family: var(--font-family-primary);
}

.btn:hover {
  color: var(--color-text-primary);
  border-color: var(--color-border-subtle);
}

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

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

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

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

.btn-link {
  border: none;
  text-decoration: underline;
  text-decoration-color: var(--color-text-muted);
  text-underline-offset: 4px;
  color: var(--color-text-secondary);
  padding: 0;
}

.btn-link:hover {
  color: var(--color-text-primary);
  text-decoration-color: var(--color-border);
}

/* ===================================
    CHAT AREA
    =================================== */
.chat-container {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-1);
  display: flex;
  flex-direction: column-reverse;
  gap: var(--spacing-1);
}

/* Custom chat container to replace Tailwind utilities */
.chat-container-custom {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-2);
  display: flex;
  flex-direction: column-reverse;
  gap: var(--spacing-3);
}

.chat-message {
  width: 100%;
  display: flex;
}

.chat-message.user {
  justify-content: flex-end;
}

.chat-message.assistant {
  justify-content: flex-start;
}

.chat-bubble {
  display: inline-block;
  max-width: 95%;
  padding: var(--spacing-2);
  font-size: var(--font-size-xs);
  border: 1px solid;
  line-height: var(--font-line-height-tight);
}

.chat-bubble.user {
  border-color: var(--color-border);
  background-color: var(--color-bg-secondary);
  color: var(--color-text-secondary);
  border-radius: 0 var(--border-radius-md) var(--border-radius-md) 0;
}

.chat-bubble.assistant {
  border-color: var(--color-accent-border);
  background-color: var(--color-accent-subtle);
  color: var(--color-accent);
  border-radius: var(--border-radius-md) 0 0 var(--border-radius-md);
}

.analysis-result {
  margin-bottom: var(--spacing-2);
  background-color: var(--color-bg-secondary);
  border-left: 2px solid var(--color-border);
  padding: var(--spacing-2);
  text-align: left;
}

.analysis-result-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  margin-bottom: var(--spacing-1);
}

.analysis-evaluation {
  font-size: var(--font-size-xs);
  font-weight: bold;
  text-transform: uppercase;
}

.analysis-evaluation.best {
  color: var(--color-accent);
}

.analysis-evaluation.good {
  color: #60a5fa;
}

.analysis-evaluation.inaccuracy {
  color: #eab308;
}

.analysis-evaluation.mistake {
  color: #f97316;
}

.analysis-evaluation.blunder {
  color: #ef4444;
}

.analysis-content {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  line-height: var(--font-line-height-tight);
}

.analysis-best-move {
  margin-top: var(--spacing-1);
  font-size: var(--font-size-xs);
}

.analysis-label {
  color: var(--color-text-muted);
  text-transform: uppercase;
}

.analysis-move {
  color: var(--color-accent);
  margin-left: var(--spacing-1);
}

/* ===================================
   INPUT AREA
   =================================== */
.input-area {
  padding: var(--spacing-2);
  background-color: var(--color-bg-primary);
  border-top: 1px solid var(--color-border);
}

.input-form {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
}

.input-prompt {
  color: var(--color-accent);
  font-weight: bold;
  font-size: var(--font-size-sm);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

.input-field {
  flex: 1;
  background-color: transparent;
  border: none;
  outline: none;
  color: var(--color-text-primary);
  placeholder-color: var(--color-text-muted);
  font-family: var(--font-family-primary);
  font-size: var(--font-size-xs);
}

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

/* ===================================
   HINT DISPLAY
   =================================== */
.hint-display {
  margin: var(--spacing-1);
  padding: var(--spacing-2);
  border: 1px dashed var(--color-accent-border);
  background-color: var(--color-accent-subtle);
  font-size: var(--font-size-xs);
  color: var(--color-accent);
}

.hint-label {
  font-weight: bold;
  margin-right: var(--spacing-2);
}

/* ===================================
   TYPING INDICATOR
   =================================== */
.typing-indicator {
  color: var(--color-accent);
  animation: pulse 1s infinite;
  font-size: var(--font-size-xs);
  padding: 0 var(--spacing-2);
}

/* ===================================
    SIMPLE LAYOUT SYSTEM
    =================================== */
.chess-wrapper {
  --sidebar-min: 180px;
  --sidebar-max: 420px;
  --sidebar-split: 33vh;
  --sidebar-width: clamp(
    var(--sidebar-min),
    calc(100vw - 100vh),
    var(--sidebar-max)
  );
  --sidebar-height: var(--sidebar-split);
  --board-size: min(100vw, calc(100vh - var(--sidebar-height)));
  display: grid;
  width: 100vw;
  height: 100vh;
  grid-template-columns: minmax(0, 1fr) var(--sidebar-width);
  grid-template-rows: 100vh;
  background-color: var(--color-bg-primary);
  overflow: hidden;
}

.chess-board-container {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 0;
  min-height: 0;
  background-color: var(--color-bg-primary);
  overflow: hidden;
  border-right: 1px solid var(--color-border);
}

.chess-sidebar {
  width: var(--sidebar-width);
  height: 100%;
  min-width: var(--sidebar-min);
  max-width: var(--sidebar-max);
  min-height: 0;
  overflow: hidden;
}

.chess-board {
  width: var(--board-size);
  height: var(--board-size);
  max-width: 100%;
  max-height: 100%;
  flex: 0 0 auto;
}

/* Wide screens: sidebar on the right */
@media (min-aspect-ratio: 1/1) {
  .chess-wrapper {
    --board-size: min(100vh, calc(100vw - var(--sidebar-width)));
    grid-template-columns: minmax(0, 1fr) var(--sidebar-width);
    grid-template-rows: 100vh;
  }

  .chess-sidebar {
    height: 100%;
  }
}

/* Square and tall screens: sidebar on the bottom */
@media (max-aspect-ratio: 1/1) {
  .chess-wrapper {
    --board-size: min(100vw, calc(100vh - var(--sidebar-height)));
    grid-template-columns: 100vw;
    grid-template-rows: minmax(0, 1fr) var(--sidebar-height);
  }

  .chess-board-container {
    border-right: none;
    border-bottom: 1px solid var(--color-border);
  }

  .chess-sidebar {
    width: 100%;
    height: var(--sidebar-height);
    min-width: 0;
    max-width: none;
  }
}

/* ===================================
     FILE GRID (Flexbox-based)
     =================================== */
.file-grid {
  display: flex;
  flex-direction: column;
  flex-wrap: wrap;
  gap: var(--spacing-2);
}

.file-grid-item {
  flex: 0 0 100%;
}

/* Responsive file grid - 2 columns */
@media (min-width: 640px) {
  .file-grid.cols-2 .file-grid-item {
    flex: 0 0 calc(50% - var(--spacing-1));
  }
}

/* Responsive file grid - 3 columns */
@media (min-width: 768px) {
  .file-grid.cols-3 .file-grid-item {
    flex: 0 0 calc(33.333% - var(--spacing-1.5));
  }
}

/* Responsive file grid - 4 columns */
@media (min-width: 1024px) {
  .file-grid.cols-4 .file-grid-item {
    flex: 0 0 calc(25% - var(--spacing-1.5));
  }
}

/* ===================================
     UTILITY CLASSES (replacing common Tailwind utilities)
     =================================== */
.opacity-50 {
  opacity: 0.5;
}

.cursor-not-allowed {
  cursor: not-allowed;
}

.h-screen {
  height: 100vh;
}

.w-screen {
  width: 100vw;
}

.h-full {
  height: 100%;
}

.w-full {
  width: 100%;
}

.overflow-hidden {
  overflow: hidden;
}

.text-xs {
  font-size: var(--font-size-xs);
}

.mb-1 {
  margin-bottom: var(--spacing-1);
}

.p-2 {
  padding: var(--spacing-2);
}

.rounded {
  border-radius: var(--border-radius-md);
}

.border {
  border: 1px solid var(--color-border);
}

.bg-neutral-900 {
  background-color: var(--color-bg-tertiary);
}

.border-neutral-700 {
  border-color: var(--color-border);
}

.text-neutral-300 {
  color: var(--color-text-primary);
}

.text-neutral-400 {
  color: var(--color-text-secondary);
}

.text-neutral-500 {
  color: var(--color-text-muted);
}

.font-bold {
  font-weight: 700;
}

/* ===================================
     RESPONSIVE UTILITIES
     =================================== */
.hidden-lg {
  display: block;
}

.visible-lg {
  display: none;
}

@media (min-width: 1024px) {
  .hidden-lg {
    display: none;
  }
  
  .visible-lg {
    display: block;
  }
}