:root {
  color-scheme: light;
  --bg: #f6f8fc;
  --panel: #ffffff;
  --text: #1f2430;
  --muted: #566074;
  --accent: #1357dd;
  --accent-hover: #0e47b5;
  --border: #d5deef;
  --success: #126b3e;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(140deg, #eef3ff 0%, var(--bg) 50%, #e9f5ff 100%);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.format-complete-indicator {
  position: fixed;
  top: 0.85rem;
  left: 50%;
  z-index: 20;
  width: 42px;
  height: 42px;
  border-radius: 999px;
  background: var(--success);
  box-shadow: 0 12px 28px rgba(18, 107, 62, 0.26);
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, -14px) scale(0.78);
}

.format-complete-indicator::before {
  content: "";
  position: absolute;
  top: 12px;
  left: 11px;
  width: 18px;
  height: 10px;
  border-bottom: 3px solid #fff;
  border-left: 3px solid #fff;
  border-radius: 2px;
  transform: rotate(-45deg) scale(0);
  transform-origin: center;
}

.format-complete-indicator.is-visible {
  animation: format-complete-pop 920ms ease-in-out;
}

.format-complete-indicator.is-visible::before {
  animation: format-checkmark-draw 920ms ease-in-out;
}

.app-shell {
  flex: 1;
  min-height: 0;
  margin: 1rem 1rem 0;
  padding: 1rem;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: 0 14px 30px rgba(20, 45, 90, 0.08);
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.app-footer {
  margin: 0.5rem 1rem 0.75rem;
  color: var(--muted);
  text-align: right;
  font-size: 0.85rem;
}

.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
  justify-content: space-between;
}

.toolbar-title {
  font-weight: 700;
  letter-spacing: 0.2px;
}

.toolbar-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  align-items: center;
}

select {
  min-width: 240px;
  padding: 0.58rem 0.7rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #fbfdff;
  color: var(--text);
  font-size: 14px;
}

.editor {
  flex: 1;
  min-height: 0;
  width: 100%;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #fbfdff;
  overflow: hidden;
  transition: border-color 0.22s ease-in-out, box-shadow 0.22s ease-in-out;
}

.editor.applied-flash {
  border-color: var(--success);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--success) 20%, transparent);
}

.CodeMirror {
  height: 100%;
  font-family: "Cascadia Code", Consolas, "Courier New", monospace;
  font-size: 14px;
  line-height: 1.5;
}

.editor-fallback {
  width: 100%;
  height: 100%;
  border: none;
  outline: none;
  resize: none;
  background: #fbfdff;
  color: var(--text);
  font-family: "Cascadia Code", Consolas, "Courier New", monospace;
  font-size: 14px;
  line-height: 1.5;
  padding: 0.85rem;
}

.cm-changed-line {
  background: color-mix(in srgb, var(--success) 18%, transparent);
}

.status {
  min-height: 1.2rem;
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

button {
  cursor: pointer;
  border: none;
  border-radius: 8px;
  padding: 0.65rem 1rem;
  font-weight: 600;
  background: var(--accent);
  color: #fff;
  transition: background 0.2s ease-in-out;
}

button:hover {
  background: var(--accent-hover);
}

.help-dialog {
  width: min(520px, calc(100vw - 2rem));
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0;
  color: var(--text);
  background: var(--panel);
  box-shadow: 0 18px 48px rgba(20, 45, 90, 0.18);
}

.help-dialog::backdrop {
  background: rgba(31, 36, 48, 0.28);
}

.help-dialog-content {
  padding: 1.1rem;
}

.help-dialog h2 {
  margin: 0 0 0.65rem;
  font-size: 1.1rem;
  line-height: 1.3;
}

.help-dialog p {
  margin: 0 0 0.8rem;
  color: var(--muted);
  line-height: 1.45;
}

.help-dialog ul {
  margin: 0 0 1rem;
  padding-left: 1.15rem;
  color: var(--text);
  line-height: 1.45;
}

.help-dialog li + li {
  margin-top: 0.35rem;
}

@keyframes format-complete-pop {
  0% {
    opacity: 0;
    transform: translate(-50%, -14px) scale(0.78);
  }

  16% {
    opacity: 1;
    transform: translate(-50%, 0) scale(1.06);
  }

  72% {
    opacity: 1;
    transform: translate(-50%, 0) scale(1);
  }

  100% {
    opacity: 0;
    transform: translate(-50%, -8px) scale(0.92);
  }
}

@keyframes format-checkmark-draw {
  0%,
  18% {
    transform: rotate(-45deg) scale(0);
  }

  34%,
  78% {
    transform: rotate(-45deg) scale(1);
  }

  100% {
    transform: rotate(-45deg) scale(0.92);
  }
}

@media (max-width: 700px) {
  .app-shell {
    margin: 0.75rem 0.75rem 0;
    padding: 0.75rem;
  }

  .toolbar-controls {
    flex-direction: column;
    align-items: stretch;
  }

  select {
    width: 100%;
    min-width: 0;
  }

  button {
    width: 100%;
  }
}