/* ==================== PYTHON & C++ CODE TRACER ==================== */

#tracer {
  width: 100%;
  max-width: 100vw;
  box-sizing: border-box;
  overflow-x: hidden;
}

.tracer-container {
  width: 100%;
  max-width: 1300px;
  margin: 0 auto;
  padding: 16px 20px 48px;
  box-sizing: border-box;
  overflow-x: hidden;
}

.tracer-header-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
  width: 100%;
  max-width: 100%;
  box-sizing: border-box;
}

.tracer-title-group {
  min-width: 0;
}

.tracer-title-group h2 {
  margin: 0;
  font-size: 22px;
  font-weight: 800;
  color: var(--ink);
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.tracer-title-logo {
  width: 26px;
  height: 26px;
  object-fit: contain;
  flex-shrink: 0;
  display: inline-block;
}

.tracer-sel-logo {
  width: 18px;
  height: 18px;
  object-fit: contain;
  flex-shrink: 0;
  display: inline-block;
}

.tracer-lang-picker {
  display: flex;
  align-items: center;
  gap: 8px;
  font: 700 13px 'JetBrains Mono', monospace;
  color: var(--ink);
  background: var(--code);
  padding: 5px 12px;
  border-radius: 8px;
  border: 1px solid var(--line);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
}

.tracer-title-group p {
  margin: 4px 0 0;
  font-size: 13px;
  color: var(--mute);
}

.tracer-actions-group {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  max-width: 100%;
}

.tracer-status-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 20px;
  font: 600 12px 'JetBrains Mono', monospace;
  background: var(--code);
  border: 1px solid var(--line);
  color: var(--mute);
  transition: all 0.3s ease;
}

.tracer-status-badge.ready {
  background: rgba(31, 157, 138, 0.12);
  border-color: var(--ok);
  color: var(--ok);
}

.tracer-status-badge.loading {
  background: rgba(242, 169, 59, 0.12);
  border-color: var(--cmp);
  color: var(--cmp);
}

.tracer-status-badge.error {
  background: rgba(228, 87, 46, 0.12);
  border-color: var(--wr);
  color: var(--wr);
}

.tracer-status-badge.clickable {
  cursor: pointer;
  user-select: none;
}

.tracer-status-badge.clickable:hover {
  filter: brightness(1.15);
  transform: translateY(-1px);
}

.tracer-status-badge .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: currentColor;
}

.tracer-status-badge.loading .dot {
  animation: pulseDot 1s infinite alternate;
}

@keyframes pulseDot {
  from { opacity: 0.3; transform: scale(0.8); }
  to { opacity: 1; transform: scale(1.2); }
}

/* Two-Column Grid */
.tracer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
  gap: 18px;
  align-items: start;
  width: 100%;
  max-width: 100%;
  min-width: 0;
  box-sizing: border-box;
}

/* Card Styling - Strictly bounded to prevent horizontal expansion */
.tracer-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 16px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
  min-width: 0;
  max-width: 100%;
  box-sizing: border-box;
  overflow: hidden;
}

.tracer-card-title {
  font: 700 12px 'JetBrains Mono', monospace;
  text-transform: uppercase;
  color: var(--mute);
  letter-spacing: 0.04em;
  margin: 0 0 8px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* Color-Highlighted Code Editor */
.ed {
  position: relative;
  height: 240px;
  border: 1px solid var(--line, #ccc);
  border-radius: 10px;
  background: var(--code, #f7f6f2);
  overflow: hidden;
  width: 100%;
  max-width: 100%;
  box-sizing: border-box;
  transition: border-color 0.2s;
}

.ed:focus-within {
  border-color: var(--ok);
}

.ed pre,
.ed textarea {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 12px;
  border: 0;
  box-sizing: border-box;
  font-family: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace !important;
  font-size: 13px !important;
  line-height: 1.6 !important;
  font-weight: 500 !important;
  letter-spacing: normal !important;
  word-spacing: normal !important;
  white-space: pre !important;
  tab-size: 4 !important;
  -moz-tab-size: 4 !important;
  text-rendering: auto !important;
  font-variant-ligatures: none !important;
}

.ed pre {
  pointer-events: none;
  overflow: hidden;
  color: var(--ink, #1f2937);
  background: transparent;
  z-index: 1;
}

.ed textarea {
  background: transparent;
  color: transparent !important;
  -webkit-text-fill-color: transparent !important;
  caret-color: var(--ink, #1f2937) !important;
  resize: none;
  outline: none;
  overflow: auto;
  overflow-x: auto;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  z-index: 2;
}

.ed textarea::selection {
  background: rgba(31, 157, 138, 0.35) !important;
  color: transparent !important;
  -webkit-text-fill-color: transparent !important;
}

/* Syntax Highlighting Tokens (Default / Light Mode) */
.ed pre .k, .code-view-container .k, .cl .k, .k { color: #8e5bd6; font-weight: 600; }
.ed pre .s, .code-view-container .s, .cl .s, .s { color: #10b981; }
.ed pre .n, .code-view-container .n, .cl .n, .n { color: #d97706; font-weight: 600; }
.ed pre .c, .code-view-container .c, .cl .c, .c { color: #64748b; font-style: italic; }
.ed pre .b, .code-view-container .b, .cl .b, .b { color: #2563eb; font-weight: 600; }

/* Dark & Midnight Theme Syntax Tokens */
:root[data-theme="dark"] .k,
:root[data-theme="midnight"] .k,
:root[data-theme="dark"] .ed pre .k,
:root[data-theme="midnight"] .ed pre .k,
:root[data-theme="dark"] .cl .k,
:root[data-theme="midnight"] .cl .k { color: #c084fc; font-weight: 600; }

:root[data-theme="dark"] .s,
:root[data-theme="midnight"] .s,
:root[data-theme="dark"] .ed pre .s,
:root[data-theme="midnight"] .ed pre .s,
:root[data-theme="dark"] .cl .s,
:root[data-theme="midnight"] .cl .s { color: #4ade80; }

:root[data-theme="dark"] .n,
:root[data-theme="midnight"] .n,
:root[data-theme="dark"] .ed pre .n,
:root[data-theme="midnight"] .ed pre .n,
:root[data-theme="dark"] .cl .n,
:root[data-theme="midnight"] .cl .n { color: #fbbf24; font-weight: 600; }

:root[data-theme="dark"] .c,
:root[data-theme="midnight"] .c,
:root[data-theme="dark"] .ed pre .c,
:root[data-theme="midnight"] .ed pre .c,
:root[data-theme="dark"] .cl .c,
:root[data-theme="midnight"] .cl .c { color: #94a3b8; font-style: italic; }

:root[data-theme="dark"] .b,
:root[data-theme="midnight"] .b,
:root[data-theme="dark"] .ed pre .b,
:root[data-theme="midnight"] .ed pre .b,
:root[data-theme="dark"] .cl .b,
:root[data-theme="midnight"] .cl .b { color: #60a5fa; font-weight: 600; }

/* System Dark Mode (when data-theme is unset / auto) */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]):not([data-theme="paper"]) .k,
  :root:not([data-theme="light"]):not([data-theme="paper"]) .ed pre .k,
  :root:not([data-theme="light"]):not([data-theme="paper"]) .cl .k { color: #c084fc; font-weight: 600; }

  :root:not([data-theme="light"]):not([data-theme="paper"]) .s,
  :root:not([data-theme="light"]):not([data-theme="paper"]) .ed pre .s,
  :root:not([data-theme="light"]):not([data-theme="paper"]) .cl .s { color: #4ade80; }

  :root:not([data-theme="light"]):not([data-theme="paper"]) .n,
  :root:not([data-theme="light"]):not([data-theme="paper"]) .ed pre .n,
  :root:not([data-theme="light"]):not([data-theme="paper"]) .cl .n { color: #fbbf24; font-weight: 600; }

  :root:not([data-theme="light"]):not([data-theme="paper"]) .c,
  :root:not([data-theme="light"]):not([data-theme="paper"]) .ed pre .c,
  :root:not([data-theme="light"]):not([data-theme="paper"]) .cl .c { color: #94a3b8; font-style: italic; }

  :root:not([data-theme="light"]):not([data-theme="paper"]) .b,
  :root:not([data-theme="light"]):not([data-theme="paper"]) .ed pre .b,
  :root:not([data-theme="light"]):not([data-theme="paper"]) .cl .b { color: #60a5fa; font-weight: 600; }
}

/* Editor Section */
.tracer-textarea {
  width: 100%;
  border: 1px solid var(--line);
  background: var(--code);
  color: var(--ink);
  font: 500 13px/1.6 'JetBrains Mono', monospace;
  padding: 12px;
  border-radius: 10px;
  resize: vertical;
  tab-size: 4;
  outline: none;
  transition: border-color 0.2s;
  box-sizing: border-box;
}

.tracer-textarea:focus {
  border-color: var(--ok);
}

.stdin-box {
  margin-top: 10px;
}

/* Source Code Run Bar */
.tracer-src-footer {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--line);
}

.tracer-src-footer .main-run {
  background: var(--ok);
  border: 1px solid var(--ok);
  color: #ffffff;
  font: 700 13.5px inherit;
  padding: 9px 22px;
  border-radius: 9px;
  cursor: pointer;
  box-shadow: 0 3px 12px rgba(31, 157, 138, 0.35);
  transition: all 0.2s ease;
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.tracer-src-footer .main-run:hover:not(:disabled) {
  filter: brightness(1.1);
  transform: translateY(-1px);
  box-shadow: 0 5px 16px rgba(31, 157, 138, 0.45);
}

.tracer-src-footer .main-run:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
}

/* Execution Bar (Desktop: cleanly styled below Variables Watch Table) */
.tracer-exec-bar {
  margin-top: 14px;
  margin-bottom: 16px;
  padding: 12px 14px;
  background: var(--code);
  border: 1px solid var(--line);
  border-radius: 10px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.tracer-progress-row {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
}

.tracer-progress-row input[type="range"] {
  flex: 1;
}

.tracer-step-counter {
  font: 700 12.5px 'JetBrains Mono', monospace;
  color: var(--mute);
  white-space: nowrap;
}

.tracer-exec-ctl {
  display: flex;
  gap: 8px;
  align-items: center;
}

.tracer-exec-ctl button {
  flex: 1;
  padding: 7px 14px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--ink);
  font: inherit;
  font-size: 13px;
  cursor: pointer;
  transition: all 0.15s ease;
  min-height: 40px;
  text-align: center;
}

.tracer-exec-ctl button.main {
  background: var(--ok);
  color: #ffffff;
  border-color: var(--ok);
  font-weight: 700;
}

.tracer-exec-ctl button.main:hover:not(:disabled) {
  background: color-mix(in srgb, var(--ok) 88%, #000);
  border-color: var(--ok);
  color: #ffffff;
}

.tracer-exec-ctl button:hover:not(:disabled) {
  border-color: var(--ink);
}

.tracer-exec-ctl button:focus-visible {
  outline: 2px solid var(--hole);
  outline-offset: 2px;
}

.tracer-exec-ctl button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
}

.tracer-trace-title {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}

.tracer-progress-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 10px;
  margin-bottom: 16px;
  width: 100%;
}

.tracer-progress-row input[type="range"] {
  flex: 1;
}

.tracer-step-counter {
  font: 700 12.5px 'JetBrains Mono', monospace;
  color: var(--mute);
  white-space: nowrap;
}

/* Right Column: Execution Tracing */
.tracer-info-banner {
  background: var(--code);
  border: 1px solid var(--line);
  border-left: 4px solid var(--ok);
  border-radius: 8px;
  padding: 10px 14px;
  font: 600 13px 'JetBrains Mono', monospace;
  color: var(--ink);
  margin-bottom: 14px;
  min-height: 20px;
  display: flex;
  align-items: center;
}

.tracer-info-banner.finished {
  border-left-color: var(--ok);
  color: var(--ok);
}

.tracer-info-banner.error {
  border-left-color: var(--wr);
  color: var(--wr);
}

/* Code Line View */
.code-view-container {
  background: var(--code);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 8px 0;
  max-height: 280px;
  overflow-x: auto;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  width: 100%;
  max-width: 100%;
  box-sizing: border-box;
  font: 13px/1.7 'JetBrains Mono', monospace;
  margin-bottom: 14px;
  position: relative;
}

.cl {
  white-space: pre;
  padding: 2px 14px 2px 0;
  color: var(--ink);
  display: flex;
  align-items: baseline;
  width: max-content;
  min-width: 100%;
  min-height: 1.7em;
  box-sizing: border-box;
  transition: background 0.15s ease;
}

.cl .no {
  display: inline-block;
  width: 36px;
  min-width: 36px;
  margin-right: 12px;
  padding-right: 8px;
  text-align: right;
  color: var(--mute);
  opacity: 0.75;
  user-select: none;
  font-size: 11.5px;
  flex-shrink: 0;
  border-right: 1px solid var(--line);
  position: sticky;
  left: 0;
  background: var(--code);
  z-index: 2;
}

.cl .cl-code {
  white-space: pre;
}

.cl.on {
  background: rgba(242, 169, 59, 0.22);
  border-left: 3px solid var(--cmp);
  font-weight: 700;
}

.cl.on .no {
  background: var(--code);
  color: var(--cmp);
  border-right-color: var(--cmp);
  font-weight: 700;
}

:root[data-theme="dark"] .cl.on,
:root[data-theme="midnight"] .cl.on {
  background: rgba(255, 179, 71, 0.18);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]):not([data-theme="paper"]) .cl.on {
    background: rgba(255, 179, 71, 0.18);
  }
}

.cl.bad {
  background: rgba(228, 87, 46, 0.25);
  border-left: 3px solid var(--wr);
  color: var(--wr);
  font-weight: 700;
}

/* Variable Watch Table */
.vars-table-wrapper {
  margin-bottom: 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
  max-height: 190px;
  overflow-y: auto;
}

.vars-table {
  width: 100%;
  border-collapse: collapse;
  font: 12.5px 'JetBrains Mono', monospace;
  text-align: left;
}

.vars-table th {
  background: var(--code);
  color: var(--mute);
  padding: 7px 12px;
  font-weight: 700;
  text-transform: uppercase;
  font-size: 11px;
  border-bottom: 1px solid var(--line);
}

.vars-table td {
  padding: 6px 12px;
  border-bottom: 1px solid var(--line);
  color: var(--ink);
}

.vars-table tr:last-child td {
  border-bottom: none;
}

.vars-table tr.chg td {
  animation: fl 1.2s ease-out;
}

@keyframes fl {
  0% { background: rgba(242, 169, 59, 0.45); }
  100% { background: transparent; }
}

.var-empty-text {
  padding: 12px;
  color: var(--mute);
  font-size: 12px;
  text-align: center;
}

/* Call Stack */
.stack-container {
  background: var(--code);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px;
  min-height: 44px;
  max-height: 140px;
  overflow-y: auto;
  margin-bottom: 14px;
  display: flex;
  flex-direction: column-reverse;
  gap: 5px;
}

.stack-frame-item {
  padding: 5px 10px;
  border-radius: 6px;
  background: var(--panel);
  border: 1px solid var(--line);
  font: 12px 'JetBrains Mono', monospace;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.stack-frame-item.top-frame {
  border-color: var(--hole);
  background: rgba(142, 91, 214, 0.12);
  font-weight: 700;
}

.stack-frame-item .frame-name {
  color: var(--hole);
}

.stack-frame-item .frame-vars {
  color: var(--mute);
  font-size: 11px;
}

/* Terminal Console Output */
.terminal-window {
  background: #0d1117;
  border: 1px solid #30363d;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.2);
}

.terminal-titlebar {
  background: #161b22;
  padding: 6px 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid #30363d;
}

.terminal-dots {
  display: flex;
  gap: 5px;
}

.terminal-dots span {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  display: inline-block;
}

.dot-red { background: #ff5f56; }
.dot-yellow { background: #ffbd2e; }
.dot-green { background: #27c93f; }

.terminal-label {
  font: 600 11px 'JetBrains Mono', monospace;
  color: #8b949e;
}

.terminal-body {
  margin: 0;
  padding: 10px 12px;
  font: 12.5px/1.5 'JetBrains Mono', monospace;
  color: #58a6ff;
  min-height: 55px;
  max-height: 140px;
  overflow-y: auto;
  white-space: pre-wrap;
  word-break: break-all;
}

.terminal-body:empty::before {
  content: "(stdout empty)";
  color: #484f58;
}

/* Error Banner */
.tracer-error-banner {
  margin-top: 10px;
  padding: 10px 14px;
  border-radius: 8px;
  background: rgba(228, 87, 46, 0.15);
  border: 1px solid var(--wr);
  color: var(--wr);
  font: 600 12.5px 'JetBrains Mono', monospace;
  display: none;
}

.tracer-error-banner.show {
  display: block;
}

/* Responsive adjustments */
@media (max-width: 900px) {
  .tracer-container {
    padding: 12px 14px calc(115px + env(safe-area-inset-bottom, 0px));
    width: 100%;
    max-width: 100vw;
    box-sizing: border-box;
    overflow-x: hidden;
  }

  .tracer-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 16px;
    width: 100%;
    max-width: 100%;
    min-width: 0;
    box-sizing: border-box;
  }

  .tracer-card {
    padding: 14px;
    min-width: 0;
    max-width: 100%;
    box-sizing: border-box;
  }

  .tracer-src-footer .main-run {
    width: 100%;
    justify-content: center;
    font-size: 15px;
    padding: 12px 20px;
    min-height: 46px;
  }

  /* Fixed to Screen Bottom on Mobile (like sorting & searching visualizer #bar) */
  .tracer-exec-bar {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 40;
    margin: 0;
    padding: 8px 12px calc(8px + env(safe-area-inset-bottom, 0px));
    background: var(--panel);
    border-top: 1px solid var(--line);
    border-radius: 0;
    border-left: none;
    border-right: none;
    border-bottom: none;
    box-shadow: 0 -4px 18px rgba(0, 0, 0, 0.16);
    gap: 6px;
  }

  .tracer-progress-row {
    margin: 0;
    gap: 8px;
  }

  .tracer-progress-row label {
    font-size: 11px !important;
  }

  .tracer-title-logo {
    width: 22px;
    height: 22px;
  }

  .tracer-sel-logo {
    width: 16px;
    height: 16px;
  }

  .tracer-exec-ctl {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 8px;
    margin: 0;
  }

  .tracer-exec-ctl button {
    padding: 0 4px;
    font-size: 13px;
    min-height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
  }
}