/* Colossal Cave Adventure -- retro terminal look: green phosphor on a near-black screen,
   system monospace (no external fonts), a hint of CRT glow and scanlines. */

:root {
  --bg: #071007;
  --bg-bar: #0a150a;
  --ink: #6dff8b;
  --ink-dim: #2f8f4c;
  --ink-bright: #c9ffd6;
  --amber: #ffb454;
  --line: #1c3a24;
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
  margin: 0;
  /* The transcript is the only scroller on the page; the viewport itself
     must never grow a scrollbar. */
  overflow: hidden;
}

body {
  display: flex;
  flex-direction: column;
  background: var(--bg);
  color: var(--ink);
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  font-size: 16px;
  line-height: 1.45;
}

/* ---- header bar ---- */

.bar {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1em;
  padding: 0.5em 1em;
  border-bottom: 1px solid var(--line);
  background: var(--bg-bar);
  flex: none;
}

.brand {
  color: var(--ink-bright);
  letter-spacing: 0.35em;
  text-shadow: 0 0 8px rgba(109, 255, 139, 0.35);
  white-space: nowrap;
}

.brand .sub {
  margin-left: 1em;
  color: var(--ink-dim);
  letter-spacing: 0.05em;
  font-size: 0.75em;
}

.tools {
  display: flex;
  gap: 0.5em;
}

.tools button,
.tools select {
  font: inherit;
  font-size: 0.8em;
  color: var(--ink);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 0;
  padding: 0.25em 0.75em;
  cursor: pointer;
}

.tools button:hover:not(:disabled),
.tools select:hover {
  border-color: var(--ink-dim);
  color: var(--ink-bright);
}

.tools button:disabled {
  opacity: 0.4;
  cursor: default;
}

/* ---- transcript ---- */

#screen {
  flex: 1;
  width: 100%;
  max-width: 85ch;
  margin-left: auto;
  margin-right: auto;
  overflow-y: auto;
  padding: 1em 1em 1.5em;
  white-space: pre-wrap;
  overflow-wrap: break-word;
  text-shadow: 0 0 6px rgba(109, 255, 139, 0.18);
  /* A terminal has no scrollbar: scrolling still works (wheel, touch,
     keyboard), but nothing flickers while the transcript grows. */
  scrollbar-width: none; /* Firefox */
}
#screen::-webkit-scrollbar {
  display: none; /* Chrome, Safari, Edge */
}

#screen .echo {
  color: var(--ink-bright);
  font-weight: bold;
}

#screen .note {
  color: var(--amber);
}

/* faint CRT scanlines over the whole page */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(
    to bottom,
    transparent 0,
    transparent 2px,
    rgba(0, 0, 0, 0.16) 3px,
    transparent 4px
  );
}

/* ---- input line ---- */

#form {
  display: flex;
  align-items: center;
  gap: 0.5em;
  padding: 0.6em 1em 0.9em;
  border-top: 1px solid var(--line);
  background: var(--bg-bar);
  flex: none;
}

#form .prompt {
  color: var(--amber);
  font-weight: bold;
}

#input {
  flex: 1;
  font: inherit;
  color: var(--ink-bright);
  background: transparent;
  border: none;
  outline: none;
  caret-color: var(--amber);
  min-width: 0; /* let flex shrink the input on narrow screens */
}

#form.idle .prompt {
  visibility: hidden;
}

#input:disabled {
  opacity: 0.35;
}

/* keep mobile keyboards comfortable */
@media (max-width: 640px) {
  #input {
    font-size: 16px; /* prevents iOS zoom-on-focus */
  }

  .brand .sub {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    scroll-behavior: auto !important;
  }
}