/* ============================================================
   Module 07 — style.css
   Same editor-chrome language as the hub, applied to a page
   whose real job is to run the student's script and show the
   real console output next to the real source.
   ============================================================ */

:root {
  --bg: #1e1e1e;
  --bg-panel: #252526;
  --bg-elevated: #2d2d30;
  --bg-terminal: #181818;
  --border: #3c3c3c;
  --border-soft: #333333;

  --text: #d4d4d4;
  --text-dim: #8a8a8a;
  --text-faint: #5a5a5a;

  --accent-yellow: #f7df1e;
  --accent-blue: #3794ff;
  --accent-green: #6a9955;
  --accent-orange: #ce9178;

  --radius: 6px;
  --font-mono:
    "JetBrains Mono", "Fira Code", ui-monospace, Menlo, Consolas, monospace;
  --font-sans:
    "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  --shadow-lift: 0 12px 24px -8px rgba(0, 0, 0, 0.55);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  line-height: 1.5;
  padding-bottom: 44px;
  -webkit-font-smoothing: antialiased;
}

/* ---------------- Title bar ---------------- */
.titlebar {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 10px 18px;
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border);
}

.titlebar .dots {
  display: flex;
  gap: 7px;
  flex-shrink: 0;
}

.titlebar .dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
}

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

.titlebar .tab {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-panel);
  border: 1px solid var(--border-soft);
  border-bottom: none;
  padding: 6px 14px;
  border-radius: 5px 5px 0 0;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-dim);
}

.titlebar .tab::before {
  content: "JS";
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  font-size: 0.6rem;
  font-weight: 700;
  color: #1e1e1e;
  background: var(--accent-yellow);
  border-radius: 3px;
}

.titlebar .back {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-dim);
  text-decoration: none;
  padding: 5px 10px;
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  transition:
    color 0.15s ease,
    border-color 0.15s ease;
}

.titlebar .back:hover,
.titlebar .back:focus-visible {
  color: var(--accent-yellow);
  border-color: var(--accent-yellow);
}

/* ---------------- Header ---------------- */
header {
  padding: 48px 24px 32px;
  max-width: 920px;
  margin: 0 auto;
}

header .eyebrow {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-green);
  margin: 0 0 14px;
}

header .eyebrow::before {
  content: "// ";
  color: var(--text-faint);
}

header h1 {
  font-family: var(--font-mono);
  font-size: clamp(1.7rem, 4.5vw, 2.4rem);
  font-weight: 700;
  margin: 0 0 10px;
  letter-spacing: -0.01em;
}

header h1 .accent {
  color: var(--accent-yellow);
}

header p {
  font-family: var(--font-mono);
  font-size: 0.92rem;
  color: var(--text-dim);
  margin: 0;
}

/* ---------------- Tab switcher ---------------- */
.panel-tabs {
  max-width: 920px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  gap: 8px;
}

.panel-tab {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-dim);
  background: var(--bg-panel);
  border: 1px solid var(--border-soft);
  border-bottom: none;
  padding: 9px 18px;
  border-radius: 6px 6px 0 0;
  cursor: pointer;
  transition:
    color 0.15s ease,
    background 0.15s ease;
}

.panel-tab.active {
  color: var(--accent-yellow);
  background: var(--bg-terminal);
}

.panel-tab:hover:not(.active) {
  color: var(--text);
}

.panel-tab:focus-visible {
  outline: 2px solid var(--accent-blue);
  outline-offset: -2px;
}

/* ---------------- Panels ---------------- */
.panels {
  max-width: 920px;
  margin: 0 auto;
  padding: 0 24px 56px;
}

.panel {
  display: none;
  border: 1px solid var(--border-soft);
  border-radius: 0 var(--radius) var(--radius) var(--radius);
  background: var(--bg-terminal);
  overflow: hidden;
  box-shadow: var(--shadow-lift);
}

.panel.active {
  display: block;
}

.panel-chrome {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 16px;
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border-soft);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--text-dim);
}

.panel-chrome .chrome-dots {
  display: flex;
  gap: 6px;
}

.panel-chrome .chrome-dots span {
  width: 9px;
  height: 9px;
  border-radius: 50%;
}

.panel-chrome button.copy-btn {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-dim);
  background: transparent;
  border: 1px solid var(--border-soft);
  border-radius: 4px;
  padding: 4px 10px;
  cursor: pointer;
  transition:
    color 0.15s ease,
    border-color 0.15s ease;
}

.panel-chrome button.copy-btn:hover,
.panel-chrome button.copy-btn:focus-visible {
  color: var(--accent-yellow);
  border-color: var(--accent-yellow);
}

/* ---------------- Terminal output ---------------- */
.terminal-output {
  padding: 18px 20px 24px;
  font-family: var(--font-mono);
  font-size: 0.86rem;
  max-height: 70vh;
  overflow-y: auto;
}

.terminal-output .term-prompt {
  color: var(--accent-green);
  margin-bottom: 10px;
}

.terminal-output .term-prompt::before {
  content: "$ ";
  color: var(--text-faint);
}

/* ---------------- Difficulty tabs ---------------- */
:root {
  --diff-easy: #89d185;
  --diff-intermediate: #cca700;
  --diff-hard: #f14c4c;
}

.panel-tab .diff-dot {
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  margin-right: 7px;
  background: currentColor;
  opacity: 0.85;
}

.panel-tab.diff-easy.active {
  color: var(--diff-easy);
}
.panel-tab.diff-intermediate.active {
  color: var(--diff-intermediate);
}
.panel-tab.diff-hard.active {
  color: var(--diff-hard);
}

.panel-tab.diff-easy:hover:not(.active) {
  color: var(--diff-easy);
}
.panel-tab.diff-intermediate:hover:not(.active) {
  color: var(--diff-intermediate);
}
.panel-tab.diff-hard:hover:not(.active) {
  color: var(--diff-hard);
}

.diff-label {
  font-weight: 600;
}

.diff-label.easy {
  color: var(--diff-easy);
}
.diff-label.intermediate {
  color: var(--diff-intermediate);
}
.diff-label.hard {
  color: var(--diff-hard);
}

.term-line {
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--text);
  padding: 1px 0;
}

.term-line.blank {
  height: 0.9em;
}

/* ---------------- Source panel ---------------- */
.source-wrap {
  max-height: 70vh;
  overflow: auto;
  margin: 0;
}

.source-wrap pre {
  margin: 0;
}

.source-wrap code {
  font-family: var(--font-mono) !important;
  font-size: 0.82rem !important;
  padding: 20px !important;
  display: block;
  background: transparent !important;
  /* for break word horizontally */
  white-space: pre-wrap !important;
  word-break: break-word !important;
  overflow-wrap: anywhere !important;
}

/* ---------------- Status bar ---------------- */
.statusbar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 18px;
  background: var(--accent-blue);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  z-index: 10;
}

.statusbar .left,
.statusbar .right {
  display: flex;
  align-items: center;
  gap: 16px;
}

.statusbar .live {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.statusbar .live-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #27c93f;
  animation: pulse 1.8s ease-in-out infinite;
}

@keyframes pulse {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.35;
  }
}

@media (prefers-reduced-motion: reduce) {
  .statusbar .live-dot {
    animation: none !important;
  }
}

/* ---------------- Responsive ---------------- */
@media (max-width: 600px) {
  header {
    padding: 36px 18px 24px;
  }

  .panel-tabs,
  .panels {
    padding-left: 18px;
    padding-right: 18px;
  }

  .terminal-output,
  .source-wrap code {
    font-size: 0.78rem !important;
  }
}