/* crunch-c lesson view.
   Palette and chrome match ware/magmascript/ so the two read as a set; the
   layout differs because this page carries prose beside the editor. */

:root { color-scheme: dark; }

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font: 14px/1.5 'Courier Prime', ui-monospace, SFMono-Regular, Menlo, monospace;
  background: #14141b; color: #e8e6f0;
  display: flex; flex-direction: column;
  height: 100vh; overflow: hidden;
}

/* ── Header ─────────────────────────────────────────────── */

header {
  display: flex; align-items: center; gap: 1rem;
  padding: .6rem 1.25rem;
  border-bottom: 1px solid #33304a;
  background: #1c1b26;
  flex-shrink: 0;
}

header h1 {
  font-family: 'Press Start 2P', monospace;
  font-size: 12px; font-weight: 400; white-space: nowrap;
  letter-spacing: 0.05em;
}
header h1 code { color: #ff6b6b; }

.controls {
  display: flex; align-items: center; gap: .6rem;
  flex-wrap: wrap; margin-left: auto;
}

.controls select {
  font: 12px/1 'Courier Prime', monospace;
  color: #e8e6f0;
  background: #282a36;
  border: 1px solid #33304a; border-radius: 6px;
  padding: .35rem 1.8rem .35rem .6rem;
  cursor: pointer;
  max-width: 46vw;
  appearance: none; -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%239d99b5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right .6rem center;
}
.controls select:hover { border-color: #7cc7ff; }
.controls select:focus {
  outline: none; border-color: #3b82f6;
  box-shadow: 0 0 0 1px #3b82f6;
}

.controls button {
  font: 12px/1 'Courier Prime', monospace;
  background: #282a36; color: #e8e6f0;
  border: 1px solid #33304a; border-radius: 6px;
  padding: .35rem .6rem; cursor: pointer;
}
.controls button:hover:not(:disabled) { border-color: #7cc7ff; }
.controls button.primary {
  background: #3b82f6; border-color: #3b82f6; color: #fff;
}
.controls button.primary:hover:not(:disabled) { background: #2563eb; }
.controls button:disabled { opacity: .4; cursor: not-allowed; }

/* ── Loading indicator ──────────────────────────────────── */

.loading-bar {
  height: 2px; flex-shrink: 0;
  background: linear-gradient(90deg, #3b82f6, #ff6b6b, #3b82f6);
  background-size: 200% 100%;
  animation: loading-slide 1.5s ease-in-out infinite;
}
.loading-bar.hidden { display: none; }

@keyframes loading-slide {
  0%   { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ── Tool nav ───────────────────────────────────────────── */

.tool-nav {
  display: flex; align-items: center; gap: .9rem;
  padding: .4rem 1.25rem;
  border-bottom: 1px solid #33304a;
  background: #1c1b26;
  flex-shrink: 0;
}
.tool-nav .back-link {
  font-family: 'Press Start 2P', monospace;
  font-size: 7px;
  color: #9d99b5;
  background: #282a36;
  padding: 6px 10px;
  border: 1px solid #33304a;
  text-decoration: none;
  letter-spacing: 0.1em;
  transition: color .15s, border-color .15s;
}
.tool-nav .back-link:hover { color: #e8e6f0; border-color: #7cc7ff; }

.breadcrumb { font-size: 11px; color: #9d99b5; }

/* ── Layout ─────────────────────────────────────────────── */

main {
  display: grid;
  grid-template-columns: 44% 4px 1fr;
  flex: 1; min-height: 0;
}

#lesson-panel {
  overflow: auto;
  background: #1a1922;
  border-right: 1px solid #33304a;
  min-width: 0;
}

#divider {
  cursor: col-resize;
  background: #33304a;
}
#divider:hover { background: #7cc7ff; }

#work-panel {
  display: flex; flex-direction: column;
  min-width: 0; min-height: 0;
}

#editor-panel {
  flex: 1 1 55%;
  min-height: 0; overflow: hidden;
  display: flex; flex-direction: column;
}

#output-panel {
  flex: 1 1 45%;
  min-height: 0;
  display: flex; flex-direction: column;
  border-top: 1px solid #33304a;
  background: #14141b;
}

/* ── Lesson prose ───────────────────────────────────────── */

#lesson-content { padding: 1.5rem 1.5rem 3rem; }

.lesson-kicker {
  font-size: 11px; color: #9d99b5;
  text-transform: uppercase; letter-spacing: .08em;
  margin-bottom: .5rem;
}

.lesson-title {
  font-family: 'Press Start 2P', monospace;
  font-size: 15px; font-weight: 400; line-height: 1.5;
  color: #ff6b6b;
  margin-bottom: 1.5rem;
}

.lesson-section { margin-bottom: 1.75rem; }

.lesson-section h3 {
  font-family: 'Press Start 2P', monospace;
  font-size: 9px; font-weight: 400;
  color: #7cc7ff;
  letter-spacing: .08em;
  margin-bottom: .85rem;
  padding-bottom: .4rem;
  border-bottom: 1px solid #33304a;
}

.lesson-section p { margin-bottom: .85rem; color: #c9c6da; }

.lesson-section ol,
.lesson-section ul { margin: 0 0 .85rem 1.25rem; color: #c9c6da; }
.lesson-section li { margin-bottom: .45rem; }

.lesson-section code {
  color: #7cc7ff;
  background: #14141b;
  padding: 1px 4px;
  border-radius: 3px;
}

.lesson-section pre {
  background: #14141b;
  border: 1px solid #33304a;
  border-left: 3px solid #3b82f6;
  padding: .75rem .9rem;
  margin-bottom: .85rem;
  overflow-x: auto;
  font-size: 13px;
}
.lesson-section pre code {
  background: none; padding: 0; color: #c9c6da;
}

/* ── Editor ─────────────────────────────────────────────── */

#editor-panel .cm-editor { flex: 1; overflow: auto; }
#editor-panel .cm-editor .cm-scroller { overflow: auto; }
#editor-panel .cm-editor .cm-content {
  font-family: 'Courier Prime', ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 14px;
}

/* ── Output ─────────────────────────────────────────────── */

#output-content {
  flex: 1; padding: 1rem; overflow: auto;
  font-size: 13px;
}

/* Three streams: what the program printed, the "spooked:" warnings it raised
   on stderr, and the fault that stopped it. In this course the warnings are
   often the whole lesson, so they are painted as their own block. */
.out-stdout,
.out-warn,
.out-error {
  white-space: pre-wrap;
  word-break: break-word;
}
.out-stdout { color: #e8e6f0; }
.out-warn   { color: #e5c07b; }
.out-error  { color: #ff6b6b; }

.out-warn,
.out-error { margin-top: .75rem; }

.out-empty { color: #9d99b5; }

#console-log {
  border-top: 1px solid #33304a;
  padding: .4rem 1rem;
  max-height: 22vh; overflow: auto;
  font-size: 12px;
  background: #1c1b26;
  flex-shrink: 0;
}
.console-line {
  padding: .1rem 0;
  white-space: pre-wrap; word-break: break-all;
}
.console-line.log { color: #9d99b5; }
.console-line.error { color: #ff6b6b; }

.empty-state {
  display: flex; align-items: center; justify-content: center;
  flex-direction: column; gap: .5rem;
  height: 100%;
  color: #9d99b5; font-size: 12px;
}
.empty-state code { font-size: 11px; color: #7cc7ff; }

/* ── Footer ─────────────────────────────────────────────── */

footer {
  display: flex; align-items: center; gap: .9rem;
  padding: .5rem 1.25rem;
  border-top: 1px solid #33304a;
  background: #1c1b26;
  font-size: 11px; color: #9d99b5;
  flex-shrink: 0;
}

.navbtn {
  font: 11px/1 'Courier Prime', monospace;
  background: #282a36; color: #e8e6f0;
  border: 1px solid #33304a; border-radius: 6px;
  padding: .35rem .7rem; cursor: pointer;
}
.navbtn:hover:not(:disabled) { border-color: #7cc7ff; }
.navbtn:disabled { opacity: .35; cursor: not-allowed; }

footer .spacer { flex: 1; }

.dot {
  display: inline-block;
  width: 7px; height: 7px; border-radius: 50%;
  margin-right: .4rem;
  background: #9d99b5;
}
.dot.ok { background: #6ee7a0; }
.dot.err { background: #ff6b6b; }
.dot.loading { background: #e5c07b; }

/* ── Narrow screens ─────────────────────────────────────── */

@media (max-width: 780px) {
  body { height: auto; overflow: auto; }
  main {
    display: flex; flex-direction: column;
    height: auto;
  }
  #lesson-panel {
    border-right: none;
    border-bottom: 1px solid #33304a;
    overflow: visible;
  }
  #divider { display: none; }
  #editor-panel { min-height: 45vh; }
  #output-panel { min-height: 35vh; }
  .controls select { max-width: 100%; }
}