:root {
  --primary-color: #0078d7;
  --primary-dark: #005fa3;
  --bg: #f3f4f6;
  --text-main: #111827;
  --text-muted: #6b7280;
  --border: #e5e7eb;
  --danger: #d13438;
}

* {
  box-sizing: border-box;
}

html, body {
  height: 100%;
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: radial-gradient(circle at top left, #e5edff 0, #f9fafb 50%, #ffffff 100%);
  color: var(--text-main);
}

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

/* Header */

header {
  padding: 16px 20px;
  background-color: #ffffff;
  border-bottom: 1px solid rgba(148, 163, 184, 0.25);
  box-shadow: 0 4px 16px rgba(15, 23, 42, 0.06);
}

.title-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-circle {
  width: 36px;
  height: 36px;
  border-radius: 14px;
  background: conic-gradient(from 210deg, #0078d7, #00a6ff, #4ade80, #0078d7);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 800;
  box-shadow: 0 8px 18px rgba(37, 99, 235, 0.35);
}

h1 {
  margin: 0;
  font-size: 1.3rem;
  letter-spacing: -0.02em;
}

.subtitle {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Layout */

#blockly-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* Toolbar */

#toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 16px;
  background: #ffffff;
  border-bottom: 1px solid var(--border);
  gap: 8px;
}

.toolbar-left,
.toolbar-right {
  display: flex;
  gap: 8px;
  align-items: center;
}

.toolbar-center {
  flex: 1;
  display: flex;
  justify-content: center;
}

button {
  border: none;
  border-radius: 999px;
  padding: 8px 14px;
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: 0.15s ease all;
}

button .btn-icon {
  font-size: 0.9rem;
}

#show-script-btn {
  background: linear-gradient(135deg, var(--primary-color), #00a6ff);
  color: #ffffff;
  box-shadow: 0 12px 25px rgba(37, 99, 235, 0.35);
}

#show-script-btn:hover {
  background: linear-gradient(135deg, var(--primary-dark), #0086d0);
  transform: translateY(-1px);
}

button.ghost {
  background-color: #f9fafb;
  color: var(--text-main);
  border: 1px solid var(--border);
}

button.ghost:hover {
  background-color: #ffffff;
}

button.danger {
  background-color: var(--danger);
  color: #ffffff;
}

button.danger:hover {
  background-color: #b32d30;
}

#block-search {
  width: 100%;
  max-width: 320px;
  padding: 7px 14px;
  border-radius: 999px;
  border: 1px solid var(--border);
  font-size: 0.85rem;
  outline: none;
  background-color: #f9fafb;
  transition: 0.15s ease all;
}

#block-search::placeholder {
  color: #9ca3af;
}

#block-search:focus {
  background-color: #ffffff;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 1px rgba(0,120,215,0.35);
}

/* Tabs */

#module-tabs {
  display: flex;
  gap: 4px;
  padding: 6px 10px 6px 16px;
  background-color: #f3f4f6;
  border-bottom: 1px solid var(--border);
  overflow-x: auto;
}

.tab {
  background-color: transparent;
  border-radius: 999px;
  border: 1px solid transparent;
  padding: 6px 12px;
  font-size: 0.8rem;
  color: #4b5563;
  cursor: pointer;
  white-space: nowrap;
}

.tab.active {
  border-color: rgba(37, 99, 235, 0.35);
  background-color: #e0ebff;
  color: #1d4ed8;
}

/* Blockly wrapper */

#blockly-wrapper {
  position: relative;
  flex: 1;
}

#blocklyDiv {
  height: calc(100% - 0px);
  width: 100%;
}

/* Zoom controls */

.zoom-controls {
  position: absolute;
  right: 12px;
  bottom: 12px;
  background-color: #ffffff;
  border-radius: 10px;
  box-shadow: 0 4px 12px rgba(15, 23, 42, 0.18);
  overflow: hidden;
}

.zoom-btn {
  padding: 6px 10px;
  background: transparent;
  color: #374151;
  border-radius: 0;
}

.zoom-btn + .zoom-btn {
  border-top: 1px solid var(--border);
}

.zoom-btn:hover {
  background-color: #f3f4f6;
}

/* Modal */

.modal {
  position: fixed;
  inset: 0;
  background-color: rgba(15, 23, 42, 0.45);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 999;
}

.modal-content {
  background-color: #ffffff;
  border-radius: 14px;
  padding: 18px 20px 20px;
  width: min(900px, 90vw);
  max-height: 80vh;
  overflow-y: auto;
  box-shadow: 0 20px 60px rgba(15, 23, 42, 0.45);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.modal-title {
  margin: 0;
  font-size: 1rem;
}

.close-btn {
  border: none;
  background: transparent;
  font-size: 1.5rem;
  cursor: pointer;
}

.code-block {
  background-color: #0b1120;
  color: #e5e7eb;
  border-radius: 10px;
  padding: 12px;
  font-family: Consolas, Menlo, Monaco, monospace;
  font-size: 0.8rem;
  overflow-x: auto;
  margin-bottom: 12px;
}

/* Notification */

.notification {
  position: fixed;
  bottom: 16px;
  right: 16px;
  background-color: #111827;
  color: #f9fafb;
  padding: 10px 16px;
  border-radius: 999px;
  font-size: 0.82rem;
  opacity: 0;
  transition: 0.3s ease opacity, 0.3s ease transform;
  transform: translateY(4px);
  z-index: 1000;
}

.notification.show {
  opacity: 1;
  transform: translateY(0);
}

/* Toolbox tweaks */

.blocklyToolboxDiv {
  border-right: 1px solid var(--border) !important;
}

.blocklyMainBackground {
  stroke-width: 0;
}

/* Responsive tweaks */

@media (max-width: 768px) {
  header {
    padding-inline: 12px;
  }
  #toolbar {
    flex-wrap: wrap;
  }
  .toolbar-left, .toolbar-right {
    order: 2;
    justify-content: flex-start;
  }
  .toolbar-center {
    order: 1;
    margin-bottom: 4px;
  }
}