/* ===== WeaverCode Styles ===== */

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

:root {
  --bg: #1a1a2e;
  --panel-bg: #16213e;
  --text: #e0e0e0;
  --accent: #0f3460;
  --primary: #e94560;
  --success: #2ecc71;
  --warning: #f39c12;
  --block-html: #4a90d9;
  --block-css: #27ae60;
  --block-js: #e67e22;
  --block-text: #7f8c8d;
  --border: #2a2a4a;
  --font: 'SF Mono', 'Cascadia Code', 'Fira Code', 'Consolas', monospace;
}

html, body {
  height: 100%;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  overflow: hidden;
}

#app {
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow-y: auto;
}

/* ---- Top Bar ---- */
#topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 16px;
  background: var(--accent);
  border-bottom: 1px solid var(--border);
  height: 48px;
  flex-shrink: 0;
}

.logo {
  font-weight: 700;
  font-size: 16px;
  color: var(--primary);
  text-decoration: none;
}
.logo:hover {
  opacity: 0.85;
}

#level-info {
  display: flex;
  gap: 12px;
  font-size: 13px;
}

#chapter-label {
  color: var(--primary);
  font-weight: 600;
}

#progress-bar {
  flex: 1;
  max-width: 200px;
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  overflow: hidden;
}

#progress-fill {
  height: 100%;
  background: var(--success);
  width: 0%;
  transition: width 0.3s;
}

#topbar-actions {
  display: flex;
  gap: 8px;
}

#topbar-actions button {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 4px 10px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 12px;
}

#topbar-actions button:hover {
  background: rgba(255,255,255,0.1);
}

#hint-btn {
  display: none;
}

#hint-btn:hover {
  background: rgba(243,156,18,0.15);
  border-color: var(--warning);
}

/* ---- Three-Panel Layout ---- */
#panels {
  flex: 1;
  min-height: 0;
  display: flex;
  gap: 1px;
  background: var(--border);
}

/* Block Palette */
#block-palette {
  width: 200px;
  min-width: 200px;
  background: var(--panel-bg);
  display: flex;
  flex-direction: column;
  overflow-y: scroll;
}

.palette-header {
  padding: 8px 12px;
  font-weight: 600;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: #888;
  border-bottom: 1px solid var(--border);
}

#block-container {
  padding: 8px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.draggable-block {
  padding: 6px 10px;
  border-radius: 4px;
  cursor: grab;
  font-size: 13px;
  user-select: none;
  color: #fff;
  transition: opacity 0.2s;
}

.draggable-block:active {
  cursor: grabbing;
  opacity: 0.7;
}

.draggable-block.cat-html { background: var(--block-html); }
.draggable-block.cat-css  { background: var(--block-css); }
.draggable-block.cat-js   { background: var(--block-js); }
.draggable-block.cat-text { background: var(--block-text); }
.draggable-block.cat-newline { background: #2ecc71; }

.palette-divider {
  height: 1px;
  background: var(--border);
  margin: 8px 0;
}

.palette-after-empty {
  margin-top: 8px;
}

.block-distractor {
  opacity: 0.65;
  border: 1px dashed rgba(255,255,255,0.25);
}

.block-ghost {
  opacity: 0.3;
}

.palette-empty {
  padding: 16px 12px;
  color: #555;
  font-size: 12px;
  text-align: center;
  line-height: 1.5;
}

.draggable-block:hover {
  filter: brightness(1.15);
}

/* Code Area */
#code-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: var(--panel-bg);
  overflow: hidden;
}

.area-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 6px 12px;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: #888;
  border-bottom: 1px solid var(--border);
}

#code-editor {
  flex: 1;
  display: flex;
}

.code-textarea {
  flex: 1;
  padding: 12px 16px;
  font-family: var(--font);
  font-size: 14px;
  line-height: 1.6;
  color: var(--text);
  caret-color: #fff;
  background: #0d1117;
  border: none;
  outline: none;
  resize: none;
  white-space: pre;
  tab-size: 2;
}

.code-textarea::placeholder {
  color: #555;
}

.code-textarea::selection {
  background: rgba(233,69,96,0.4);
  color: var(--text);
}

#code-editor.drag-over {
  outline: 2px dashed var(--primary);
  outline-offset: -2px;
}

/* Preview Area */
#preview-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: var(--panel-bg);
  overflow: hidden;
}

#preview-frame {
  flex: 1;
  border: none;
  background: #fff;
  width: 100%;
}

#run-btn {
  background: transparent;
  border: 1px solid var(--success);
  color: var(--success);
  padding: 2px 10px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 11px;
}

/* ---- Bottom Bar ---- */
#bottom-bar {
  display: flex;
  align-items: center;
  padding: 8px 16px;
  background: var(--accent);
  border-top: 1px solid var(--border);
  height: 48px;
  flex-shrink: 0;
}

#level-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  flex: 1;
}

#level-nav button {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 4px 12px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 12px;
}

#level-nav button:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

#level-nav button:hover:not(:disabled) {
  background: rgba(255,255,255,0.1);
}

#next-btn.visible {
  display: inline-block;
}

#level-counter {
  font-size: 13px;
  color: #aaa;
}

#submit-area {
  display: flex;
  align-items: center;
  gap: 12px;
}

#verify-btn {
  background: var(--primary);
  border: none;
  color: #fff;
  padding: 6px 20px;
  border-radius: 4px;
  cursor: pointer;
  font-weight: 600;
  font-size: 13px;
}

#verify-btn:hover {
  opacity: 0.9;
}

#verify-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

#feedback-message {
  font-size: 12px;
}

.feedback-success { color: var(--success); }
.feedback-error { color: var(--primary); }
.feedback-hint { color: var(--warning); }

/* ---- Modals ---- */
.modal {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.modal.hidden { display: none; }

.modal-content {
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 24px;
  max-width: 400px;
  width: 90%;
  text-align: center;
}

.modal-content h3 {
  margin-bottom: 12px;
  font-size: 18px;
}

.modal-content button {
  margin-top: 16px;
  padding: 8px 20px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 13px;
}

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

.modal-close {
  float: right;
  cursor: pointer;
  font-size: 20px;
  opacity: 0.6;
}

/* ---- Level Description (clickable title bar) ---- */
#level-description {
  padding: 8px 16px;
  background: #0d1117;
  border-bottom: 1px solid var(--border);
  font-size: 13px;
  color: #aaa;
  cursor: pointer;
  user-select: none;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
  transition: background 0.15s;
}

#level-description:hover {
  background: #161b22;
}

#level-description .desc-icon {
  font-size: 11px;
  opacity: 0.5;
}

#level-description .desc-title {
  flex: 1;
  color: #ccc;
  font-weight: 500;
}

#level-description .desc-hint {
  font-size: 11px;
  color: #555;
}

/* ---- Instruction Modal ---- */
.modal-wide {
  max-width: 540px;
  text-align: left;
}

#instruction-title {
  margin-bottom: 16px;
  font-size: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}

#instruction-body {
  font-size: 13px;
  line-height: 1.7;
  color: #ccc;
}

#instruction-body .inst-section {
  margin-bottom: 16px;
}

#instruction-body .inst-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--primary);
  font-weight: 600;
  margin-bottom: 4px;
}

#instruction-body .inst-goal {
  color: #e0e0e0;
}

/* ---- Level Selector Panel ---- */
#selector-overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.5);
  z-index: 500;
}
#selector-overlay.hidden { display: none; }

.selector-panel {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: 340px;
  background: var(--panel-bg);
  border-right: 1px solid var(--border);
  z-index: 600;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: transform 0.25s ease;
}
.selector-panel.hidden {
  display: flex;
  transform: translateX(-100%);
  pointer-events: none;
}

.selector-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  font-weight: 600;
  font-size: 14px;
}
.selector-header button {
  background: none;
  border: none;
  color: var(--text);
  font-size: 22px;
  cursor: pointer;
  opacity: 0.6;
}
.selector-header button:hover { opacity: 1; }

#selector-body {
  flex: 1;
  overflow-y: scroll;
  padding: 12px 16px;
}

.selector-chapter {
  margin-bottom: 20px;
}
.selector-chapter-title {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--primary);
  font-weight: 600;
  margin-bottom: 8px;
  padding-bottom: 4px;
  border-bottom: 1px solid var(--border);
}

.selector-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 6px;
}

.selector-level {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 8px 4px;
  border-radius: 6px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.15s;
  font-size: 12px;
  text-align: center;
}
.selector-level .level-num {
  font-weight: 700;
  font-size: 14px;
}
.selector-level .level-status {
  font-size: 10px;
  margin-top: 2px;
}
.selector-level:hover {
  border-color: var(--border);
  background: rgba(255,255,255,0.05);
}
.selector-level.current {
  border-color: var(--primary);
  background: rgba(233,69,96,0.15);
}
.selector-level.locked {
  opacity: 0.35;
  cursor: not-allowed;
}
.selector-level.locked:hover {
  border-color: transparent;
  background: transparent;
}
.selector-level.completed .level-num {
  color: var(--success);
}
.selector-level.unlocked .level-num {
  color: var(--text);
}
.selector-level .score-badge {
  font-size: 9px;
  background: var(--success);
  color: #000;
  padding: 0 4px;
  border-radius: 3px;
  margin-top: 2px;
}

/* ---- Scrollbar Styling ---- */
#app::-webkit-scrollbar,
#block-palette::-webkit-scrollbar,
#selector-body::-webkit-scrollbar {
  width: 8px;
}
#app::-webkit-scrollbar-track,
#block-palette::-webkit-scrollbar-track,
#selector-body::-webkit-scrollbar-track {
  background: var(--bg);
}
#app::-webkit-scrollbar-thumb,
#block-palette::-webkit-scrollbar-thumb,
#selector-body::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 4px;
}
#app::-webkit-scrollbar-thumb:hover,
#block-palette::-webkit-scrollbar-thumb:hover,
#selector-body::-webkit-scrollbar-thumb:hover {
  background: #3a3a5a;
}
/* Firefox scrollbar */
#app, #block-palette, #selector-body {
  scrollbar-width: thin;
  scrollbar-color: var(--border) var(--bg);
}

/* ---- Responsive ---- */
@media (max-width: 768px) {
  #panels {
    flex-direction: column;
  }
  #block-palette {
    width: 100%;
    min-width: 100%;
    max-height: 120px;
    flex-direction: row;
    flex-wrap: wrap;
  }
  #block-container {
    flex-direction: row;
    flex-wrap: wrap;
  }
}