/* KS4 IDE — Phase 1 styling
 * All rules are scoped under .ks4-ide so the widget can be dropped into
 * any host page without bleeding into surrounding styles. */

.ks4-ide {
  --ks4-bg:        #1f2330;
  --ks4-panel:    #2a2f3e;
  --ks4-border:   #3a4154;
  --ks4-text:     #e6e8ef;
  --ks4-muted:    #9aa3b8;
  --ks4-accent:   #7c4dff;
  --ks4-accent-2: #4dd0e1;
  --ks4-success:  #66bb6a;
  --ks4-error:    #ef5350;
  --ks4-console-bg: #11141c;
  --ks4-sidebar-bg: #e8eef7;
  --ks4-sidebar-text: #1f2330;
  --ks4-sidebar-border: #c8d3e6;

  box-sizing: border-box;
  display: block;
  width: 100%;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color: var(--ks4-text);
  background: var(--ks4-bg);
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid var(--ks4-border);
  margin: 1rem 0;
}

.ks4-ide *, .ks4-ide *::before, .ks4-ide *::after {
  box-sizing: border-box;
}

/* ---------- Toolbar ---------- */
.ks4-ide__toolbar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 0.8rem;
  background: var(--ks4-panel);
  border-bottom: 1px solid var(--ks4-border);
  flex-wrap: wrap;
}

.ks4-ide__title {
  font-weight: 600;
  font-size: 0.95rem;
  margin-right: auto;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.ks4-ide__btn {
  appearance: none;
  border: 0;
  background: var(--ks4-accent);
  color: white;
  font: inherit;
  font-weight: 600;
  font-size: 0.9rem;
  padding: 0.5rem 0.9rem;
  border-radius: 6px;
  cursor: pointer;
  min-height: 38px;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  transition: filter 0.15s, transform 0.05s;
}

.ks4-ide__btn:hover:not(:disabled) { filter: brightness(1.1); }
.ks4-ide__btn:active:not(:disabled) { transform: translateY(1px); }
.ks4-ide__btn:disabled { opacity: 0.5; cursor: not-allowed; }

.ks4-ide__btn--secondary {
  background: transparent;
  color: var(--ks4-text);
  border: 1px solid var(--ks4-border);
}

.ks4-ide__btn--run    { background: var(--ks4-success); }
.ks4-ide__btn--clear  { background: #546e7a; }
.ks4-ide__btn--reset  { background: #ff7043; }

.ks4-ide__mode {
  display: inline-flex;
  border: 1px solid var(--ks4-border);
  border-radius: 6px;
  overflow: hidden;
}
.ks4-ide__mode button {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--ks4-muted);
  font: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.4rem 0.8rem;
  cursor: pointer;
  min-height: 32px;
}
.ks4-ide__mode button[aria-pressed="true"] {
  background: var(--ks4-accent);
  color: white;
}

/* ---------- Body layout ---------- */
.ks4-ide__body {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}

@media (min-width: 980px) {
  .ks4-ide__body { grid-template-columns: minmax(0, 1fr) 300px 260px; }
  .ks4-ide__body--no-sidebar { grid-template-columns: minmax(0, 1fr) 300px; }
  .ks4-ide__body--no-watch   { grid-template-columns: minmax(0, 1fr) 260px; }
  .ks4-ide__body--no-watch.ks4-ide__body--no-sidebar { grid-template-columns: 1fr; }
}

.ks4-ide__main {
  display: flex;
  flex-direction: column;
  min-height: 520px;
}

.ks4-ide__editor {
  flex: 2 1 240px;
  border-bottom: 1px solid var(--ks4-border);
  overflow: hidden;
  position: relative;
  min-height: 200px;
}

.ks4-ide__editor .CodeMirror {
  height: 100%;
  font-size: 0.95rem;
  font-family: "SF Mono", Menlo, Consolas, monospace;
}

/* ---------- Output (console) ---------- */
.ks4-ide__output {
  flex: 1 1 180px;
  background: var(--ks4-console-bg);
  position: relative;
  overflow: hidden;
  min-height: 160px;
  border-bottom: 1px solid var(--ks4-border);
}

.ks4-ide__output-label {
  position: absolute;
  top: 6px;
  right: 10px;
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ks4-muted);
  pointer-events: none;
}

.ks4-ide__console {
  height: 100%;
  width: 100%;
  margin: 0;
  padding: 0.8rem 1rem;
  background: transparent;
  color: #d7e3f5;
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.9rem;
  line-height: 1.45;
  overflow: auto;
  white-space: pre-wrap;
  word-break: break-word;
}

.ks4-ide__console .ks4-ide__line--error { color: var(--ks4-error); }
.ks4-ide__console .ks4-ide__line--system { color: var(--ks4-accent-2); font-style: italic; }

.ks4-ide__input-row {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}
.ks4-ide__input-prompt { color: var(--ks4-accent-2); }
.ks4-ide__input-field {
  background: transparent;
  border: 0;
  border-bottom: 1px dashed var(--ks4-accent-2);
  color: inherit;
  font: inherit;
  outline: none;
  padding: 1px 4px;
  min-width: 8ch;
}

/* ---------- Turtle canvas ---------- */
.ks4-ide__turtle-host {
  height: 100%;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #ffffff;
  overflow: auto;
  padding: 0.5rem;
}

.ks4-ide__turtle {
  display: block;
}

/* ---------- Sidebar (accordion) ---------- */
.ks4-ide__sidebar {
  background: var(--ks4-sidebar-bg);
  color: var(--ks4-sidebar-text);
  border-left: 1px solid var(--ks4-border);
  overflow: auto;
  max-height: 600px;
}

@media (max-width: 979px) {
  .ks4-ide__sidebar {
    border-left: 0;
    border-top: 1px solid var(--ks4-border);
    max-height: 360px;
  }
}

.ks4-ide__sidebar-header {
  padding: 0.7rem 0.9rem;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: #5a6478;
  border-bottom: 1px solid var(--ks4-sidebar-border);
  background: #d9e2f1;
}

.ks4-ide__accordion details {
  border-bottom: 1px solid var(--ks4-sidebar-border);
}

.ks4-ide__accordion summary {
  padding: 0.7rem 0.9rem;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  list-style: none;
  user-select: none;
}
.ks4-ide__accordion summary::-webkit-details-marker { display: none; }
.ks4-ide__accordion summary::after {
  content: "▾";
  margin-left: auto;
  color: #8a93a8;
  transition: transform 0.15s;
}
.ks4-ide__accordion details[open] summary::after { transform: rotate(180deg); }
.ks4-ide__accordion summary:hover { background: #d9e2f1; }

.ks4-ide__accordion .ks4-ide__icon {
  font-size: 1.1rem;
}

.ks4-ide__accordion-body {
  padding: 0 0.9rem 0.8rem;
}

.ks4-ide__topic {
  margin-top: 0.6rem;
}
.ks4-ide__topic h4 {
  margin: 0 0 0.25rem;
  font-size: 0.9rem;
  font-weight: 700;
}
.ks4-ide__topic p {
  margin: 0 0 0.4rem;
  font-size: 0.85rem;
  line-height: 1.4;
  color: #2a3142;
}
.ks4-ide__topic pre {
  margin: 0;
  padding: 0.5rem 0.6rem;
  background: #1f2330;
  color: #d7e3f5;
  border-radius: 5px;
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.78rem;
  line-height: 1.4;
  white-space: pre-wrap;
  word-break: break-word;
}
.ks4-ide__topic-actions {
  display: flex;
  gap: 0.4rem;
  margin-top: 0.35rem;
}
.ks4-ide__topic-actions button {
  appearance: none;
  border: 1px solid #c8d3e6;
  background: white;
  color: #2a3142;
  font: inherit;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.3rem 0.6rem;
  border-radius: 4px;
  cursor: pointer;
}
.ks4-ide__topic-actions button:hover { background: #eef3fb; }
.ks4-ide__topic-actions button.ks4-ide__inserted {
  background: var(--ks4-success);
  border-color: var(--ks4-success);
  color: white;
}

/* ---------- Status indicator ---------- */
.ks4-ide__status {
  font-size: 0.75rem;
  color: var(--ks4-muted);
  margin-left: 0.5rem;
}
.ks4-ide__status--running { color: var(--ks4-accent-2); }
.ks4-ide__status--error   { color: var(--ks4-error); }
.ks4-ide__status--ok      { color: var(--ks4-success); }

/* ---------- Phase 2: variables watch panel ---------- */
.ks4-ide__btn[data-action="watch"][aria-pressed="false"] {
  opacity: 0.55;
}

.ks4-ide__watch {
  min-height: 200px;
  background: #11141c;
  color: var(--ks4-text);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  border-left: 1px solid var(--ks4-border);
}

@media (max-width: 979px) {
  .ks4-ide__watch {
    border-left: 0;
    border-top: 1px solid var(--ks4-border);
    max-height: 320px;
  }
}

.ks4-ide__watch-header {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 0.55rem 0.8rem;
  background: #181c27;
  border-bottom: 1px solid var(--ks4-border);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--ks4-muted);
}

.ks4-ide__watch-title-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.6rem;
}

.ks4-ide__watch-title {
  color: var(--ks4-accent-2);
  font-weight: 700;
}

.ks4-ide__watch-hint {
  text-transform: none;
  font-style: italic;
  letter-spacing: 0;
  color: #6c7689;
  font-size: 0.78rem;
  line-height: 1.3;
}

.ks4-ide__watch-body {
  flex: 1;
  overflow: auto;
  padding: 0;
}

.ks4-ide__watch-table {
  width: 100%;
  border-collapse: collapse;
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.82rem;
  color: #d7e3f5;
}

.ks4-ide__watch-table thead th {
  position: sticky;
  top: 0;
  background: #1f2330;
  color: var(--ks4-accent-2);
  text-align: left;
  font-weight: 700;
  padding: 0.4rem 0.7rem;
  border-bottom: 1px solid var(--ks4-border);
  white-space: nowrap;
}

.ks4-ide__watch-table tbody td {
  padding: 0.3rem 0.7rem;
  border-bottom: 1px solid #1c212e;
  white-space: nowrap;
}

.ks4-ide__watch-table tbody tr:hover td { background: #181c27; }

.ks4-ide__watch-line {
  color: var(--ks4-muted);
  font-weight: 600;
  width: 1%;
}

.ks4-ide__watch-undef { color: #4a5266; }
.ks4-ide__watch-changed {
  color: #ffd54f;
  background: rgba(255, 213, 79, 0.07);
}

.ks4-ide__watch-note {
  padding: 0.4rem 0.9rem;
  font-size: 0.75rem;
  color: var(--ks4-muted);
  font-style: italic;
  border-top: 1px dashed var(--ks4-border);
}

/* Step-through controls in the watch header */
.ks4-ide__watch-controls {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  flex-wrap: wrap;
}

.ks4-ide__watch-counter {
  font-size: 0.75rem;
  color: var(--ks4-muted);
  text-transform: none;
  letter-spacing: 0;
  white-space: nowrap;
}

.ks4-ide__watch-step-btn {
  appearance: none;
  border: 1px solid var(--ks4-border);
  background: #1f2330;
  color: var(--ks4-text);
  font: inherit;
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.22rem 0.55rem;
  border-radius: 4px;
  cursor: pointer;
  min-height: 26px;
}
.ks4-ide__watch-step-btn:hover:not(:disabled) { background: #2a2f3e; }
.ks4-ide__watch-step-btn:disabled { opacity: 0.4; cursor: not-allowed; }
.ks4-ide__watch-step-btn--primary {
  background: var(--ks4-accent);
  border-color: var(--ks4-accent);
  color: white;
}
.ks4-ide__watch-step-btn--primary:hover:not(:disabled) { filter: brightness(1.1); background: var(--ks4-accent); }

/* Current row highlight in the trace table */
.ks4-ide__watch-table tbody tr.ks4-ide__watch-current td {
  background: rgba(255, 213, 79, 0.18);
  box-shadow: inset 3px 0 0 #ffd54f;
}
.ks4-ide__watch-table tbody tr.ks4-ide__watch-current .ks4-ide__watch-line {
  color: #ffd54f;
}

/* CodeMirror line highlight while stepping */
.ks4-ide__cm-current-line {
  background: rgba(255, 213, 79, 0.18) !important;
}

/* ---------- Phase 2: trace-exercise mode ---------- */
.ks4-ide--trace {
  background: var(--ks4-bg);
}

.ks4-ide__trace {
  display: flex;
  flex-direction: column;
  min-height: 480px;
}

.ks4-ide__trace-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem;
  padding: 0.7rem 0.9rem;
  background: var(--ks4-panel);
  border-bottom: 1px solid var(--ks4-border);
}

.ks4-ide__trace-title {
  font-weight: 700;
  font-size: 1rem;
  margin: 0;
  margin-right: auto;
}

.ks4-ide__trace-picker {
  appearance: none;
  background: #1f2330;
  color: var(--ks4-text);
  border: 1px solid var(--ks4-border);
  border-radius: 6px;
  padding: 0.35rem 0.6rem;
  font: inherit;
  font-size: 0.85rem;
  min-width: 220px;
}

.ks4-ide__trace-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}
@media (min-width: 900px) {
  .ks4-ide__trace-body { grid-template-columns: minmax(280px, 1fr) minmax(360px, 1.3fr); }
}

.ks4-ide__trace-code {
  border-right: 1px solid var(--ks4-border);
  border-bottom: 1px solid var(--ks4-border);
}
.ks4-ide__trace-code .CodeMirror {
  height: 100%;
  min-height: 240px;
  font-size: 0.9rem;
}

.ks4-ide__trace-prompt {
  background: var(--ks4-panel);
  border-bottom: 1px solid var(--ks4-border);
  padding: 0.6rem 0.9rem;
  font-size: 0.9rem;
  color: var(--ks4-text);
  line-height: 1.45;
}

.ks4-ide__trace-table-wrap {
  background: #ffffff;
  color: #1f2330;
  padding: 0.8rem 1rem;
  overflow: auto;
  min-height: 240px;
}

.ks4-ide__trace-table {
  width: 100%;
  border-collapse: collapse;
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.88rem;
}

.ks4-ide__trace-table th,
.ks4-ide__trace-table td {
  border: 1px solid #c8d3e6;
  padding: 0.4rem 0.5rem;
  text-align: left;
  vertical-align: middle;
}

.ks4-ide__trace-table thead th {
  background: #e8eef7;
  font-weight: 700;
  color: #2a3142;
  white-space: nowrap;
}

.ks4-ide__trace-table tbody tr.ks4-ide__trace-row--new {
  background: #f4f8ff;
}

.ks4-ide__trace-cell-input {
  width: 100%;
  border: 0;
  background: transparent;
  font: inherit;
  font-size: 0.88rem;
  padding: 0.1rem 0.2rem;
  outline: none;
}

.ks4-ide__trace-cell--correct {
  background: #c8e6c9 !important;
  color: #1b5e20;
}

.ks4-ide__trace-cell--wrong {
  background: #ffcdd2 !important;
  color: #b71c1c;
}

.ks4-ide__trace-cell--revealed {
  background: #fff9c4 !important;
  color: #5d4037;
}

.ks4-ide__trace-correct-hint {
  display: block;
  font-size: 0.75rem;
  color: #b71c1c;
  margin-top: 2px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

.ks4-ide__trace-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 0.7rem 0.9rem;
  background: var(--ks4-panel);
  border-top: 1px solid var(--ks4-border);
}

.ks4-ide__trace-feedback {
  padding: 0.6rem 0.9rem;
  background: var(--ks4-panel);
  color: var(--ks4-muted);
  border-top: 1px solid var(--ks4-border);
  font-size: 0.85rem;
}
.ks4-ide__trace-feedback--ok    { color: var(--ks4-success); }
.ks4-ide__trace-feedback--error { color: var(--ks4-error); }