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

[hidden] {
  display: none !important;
}

:root {
  --bg: #f5f7fa;
  --chrome: #ffffff;
  --border: #e2e8f0;
  --text: #1e293b;
  --muted: #64748b;
  --accent: #4f46e5;
  --accent-soft: #eef2ff;
}

html, body {
  height: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
}

/* ---- Toolbar ---- */
.toolbar {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 8px 14px;
  background: var(--chrome);
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}

.toolbar-group {
  display: flex;
  align-items: center;
  gap: 6px;
}

.toolbar-group.right {
  margin-left: auto;
}

.brand strong {
  font-size: 0.95rem;
  letter-spacing: -0.2px;
}

.toolbar button {
  font-family: inherit;
  font-size: 0.85rem;
  cursor: pointer;
  border: 1px solid var(--border);
  background: var(--chrome);
  color: var(--text);
  border-radius: 7px;
  padding: 6px 10px;
  line-height: 1;
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.toolbar button:hover {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent);
}

.toolbar button.active,
.toolbar button[aria-pressed="true"] {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.format button {
  min-width: 34px;
}

/* Segmented control */
.seg {
  display: inline-flex;
  border: 1px solid var(--border);
  border-radius: 7px;
  overflow: hidden;
}

.seg-btn {
  border: none !important;
  border-radius: 0 !important;
}

.seg-btn:not(:last-child) {
  border-right: 1px solid var(--border) !important;
}

.save-status {
  font-size: 0.75rem;
  color: var(--muted);
  min-width: 48px;
}

/* ---- Workspace ---- */
.workspace {
  flex: 1;
  display: flex;
  min-height: 0;
  position: relative;
}

.canvas {
  flex: 1;
  border: none;
  background: #fff;
  min-width: 0;
}

.source {
  flex: 1;
  border: none;
  resize: none;
  padding: 18px;
  font-family: "SF Mono", Monaco, Consolas, "Liberation Mono", monospace;
  font-size: 0.85rem;
  line-height: 1.6;
  tab-size: 2;
  color: var(--text);
  background: #fff;
  outline: none;
}

/* ---- Side panels ---- */
.panel {
  flex-shrink: 0;
  width: 320px;
  max-width: 80vw;
  display: flex;
  flex-direction: column;
  background: var(--chrome);
  border-left: 1px solid var(--border);
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  font-weight: 600;
  font-size: 0.85rem;
}

.panel-close {
  border: none;
  background: none;
  font-size: 1.3rem;
  line-height: 1;
  cursor: pointer;
  color: var(--muted);
  padding: 0 4px;
}

.panel-close:hover { color: var(--text); }

.panel .source.css {
  flex: 1;
}

.panel-hint {
  padding: 10px 14px;
  font-size: 0.75rem;
  color: var(--muted);
}

.panel-hint code,
.asset-ref code {
  font-family: "SF Mono", Monaco, Consolas, monospace;
  background: var(--accent-soft);
  color: var(--accent);
  padding: 1px 5px;
  border-radius: 4px;
}

/* ---- Asset list ---- */
.asset-list {
  list-style: none;
  overflow-y: auto;
  flex: 1;
}

.asset-item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  align-items: start;
  gap: 8px 10px;
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
}

.asset-thumb {
  grid-row: span 2;
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  border-radius: 6px;
  border: 1px solid var(--border);
  object-fit: cover;
  background: var(--bg);
  display: grid;
  place-items: center;
  font-size: 1.1rem;
  overflow: hidden;
}

.asset-meta {
  min-width: 0;
}

.asset-name {
  font-size: 0.82rem;
  font-weight: 600;
  width: 100%;
  border: 1px solid transparent;
  background: transparent;
  color: var(--text);
  border-radius: 4px;
  padding: 2px 4px;
  font-family: inherit;
  overflow: hidden;
  text-overflow: ellipsis;
}

.asset-name:focus {
  border-color: var(--accent);
  background: #fff;
  outline: none;
}

.asset-ref {
  font-size: 0.7rem;
  color: var(--muted);
  margin-top: 3px;
  line-height: 1.5;
}

.asset-ref code {
  word-break: break-all;
}

.asset-actions {
  grid-column: 2;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.asset-actions button {
  font-size: 0.72rem;
  padding: 4px 7px;
  border: 1px solid var(--border);
  background: var(--chrome);
  color: var(--text);
  border-radius: 6px;
  cursor: pointer;
}

.asset-actions button:hover {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent);
}

.asset-actions .del:hover {
  background: #fef2f2;
  border-color: #ef4444;
  color: #ef4444;
}

.asset-empty {
  padding: 18px 14px;
  font-size: 0.8rem;
  color: var(--muted);
  text-align: center;
}

/* ---- Drop overlay ---- */
.drop-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: rgba(79, 70, 229, 0.18);
  backdrop-filter: blur(2px);
  display: grid;
  place-items: center;
}

.drop-card {
  background: #fff;
  border: 2px dashed var(--accent);
  color: var(--accent);
  font-weight: 600;
  font-size: 1.1rem;
  padding: 40px 56px;
  border-radius: 16px;
  box-shadow: 0 10px 40px rgba(0,0,0,0.15);
}

@media (max-width: 640px) {
  .panel { width: 100%; position: absolute; inset: 0; z-index: 5; }
  .brand { display: none; }
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1117;
    --chrome: #1a1d27;
    --border: #2e3248;
    --text: #e8e9f0;
    --muted: #8b8fa8;
    --accent: #818cf8;
    --accent-soft: #6c63ff22;
  }
  .canvas, .source { background: #14161e; color: var(--text); }
  .asset-name:focus { background: #0f1117; }
  .asset-actions .del:hover { background: #7f1d1d33; border-color: #ef4444; color: #fca5a5; }
  .drop-card { background: var(--chrome); box-shadow: 0 10px 40px #0009; }
}