/* IllinixOS page styles */
:root {
  --bg:        #0b0f17;
  --bg-soft:   #111726;
  --panel:     #0e1422;
  --border:    #1f2b40;
  --text:      #c9d4e5;
  --muted:     #7d8aa3;
  --accent:    #4f9dff;   /* shell / blue   (was #57c7ff cyan) */
  --accent2:   #ff8c42;   /* console / orange (was #7ee787 green) */
  --accent3:   #7fb4ff;   /* tour / light blue (was #d2a8ff purple) */
  --warn:      #ffb86b;
  --illini-orange: #ff5f05;  /* UIUC */
  --illini-blue:   #13294b;  /* UIUC */
  --radius:    12px;
  --mono: "SFMono-Regular", ui-monospace, "JetBrains Mono", Menlo, Consolas, monospace;
  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Inter, sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; overflow-x: hidden; }
body {
  background: radial-gradient(1200px 600px at 70% -10%, #15203a 0%, var(--bg) 55%);
  color: var(--text);
  font-family: var(--sans);
  line-height: 1.55;
  min-height: 100vh;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { max-width: 1240px; margin: 0 auto; padding: 28px 20px 64px; }

/* ---- header ---- */
header.masthead { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.logo {
  font-family: var(--mono); font-weight: 700; font-size: 13px;
  color: var(--illini-blue); background: var(--illini-orange);
  padding: 6px 10px; border-radius: 8px; letter-spacing: .5px;
}
.masthead h1 { font-size: 26px; margin: 0; letter-spacing: -.4px; }
.masthead .tag { color: var(--muted); font-size: 14px; margin-top: 2px; }
.spacer { flex: 1; }
.links a {
  display: inline-flex; align-items: center; gap: 6px;
  border: 1px solid var(--border); background: var(--bg-soft);
  color: var(--text); padding: 8px 12px; border-radius: 9px; font-size: 13px; margin-left: 8px;
}
.links a:hover { border-color: var(--accent); text-decoration: none; }

/* ---- authors box ---- */
.authors {
  border: 1px solid var(--border); background: var(--bg-soft);
  border-radius: 10px; padding: 10px 14px; font-size: 13px;
}
.authors-title {
  font-size: 11px; text-transform: uppercase; letter-spacing: .12em;
  color: var(--muted); font-weight: 600; margin-bottom: 6px;
}
.authors .author { color: var(--text); }
.authors .author + .author { margin-top: 4px; }
.authors .email { color: var(--muted); font-family: var(--mono); font-size: 12px; margin-left: 6px; }
.authors-course {
  margin-top: 8px; padding-top: 8px; border-top: 1px solid var(--border);
  color: var(--muted); font-size: 12px;
}

/* ---- intro card ---- */
.card {
  margin-top: 22px; background: var(--panel); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 18px 20px;
}
.card p { margin: 0 0 12px; color: #b6c2d6; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  font-family: var(--mono); font-size: 12px; color: var(--text);
  background: #0c1322; border: 1px solid var(--border); border-radius: 999px; padding: 5px 11px;
}
.chip b { color: var(--accent); font-weight: 600; }

/* ---- toolbar ---- */
.toolbar {
  margin-top: 20px; display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
}
button.btn {
  font-family: var(--sans); font-size: 13px; font-weight: 600;
  color: var(--text); background: var(--bg-soft); border: 1px solid var(--border);
  padding: 9px 14px; border-radius: 9px; cursor: pointer; transition: .15s;
}
button.btn:hover:not(:disabled) { border-color: var(--accent); color: #fff; }
button.btn:disabled { opacity: .4; cursor: not-allowed; }
button.btn.primary { background: var(--accent); color: #04121d; border-color: var(--accent); }
button.btn.primary:hover { filter: brightness(1.08); }
.status {
  margin-left: auto; font-family: var(--mono); font-size: 12.5px; color: var(--muted);
  display: inline-flex; align-items: center; gap: 8px;
}
.dot { width: 9px; height: 9px; border-radius: 50%; background: var(--muted); }
.dot.boot { background: var(--warn); animation: pulse 1.1s infinite; }
.dot.ready { background: #46d369; }   /* green = live, distinct from the orange boot dot */
.dot.err  { background: #ff6b6b; }
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:.35} }

.cmds { margin: 10px 0 0; color: var(--muted); font-size: 13px; }
.cmds code {
  font-family: var(--mono); background: #0c1322; padding: 1px 6px;
  border-radius: 5px; color: var(--accent); margin: 0 1px;
}

/* ---- terminals ---- */
.screens { margin-top: 16px; display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 900px) { .screens { grid-template-columns: 1fr; } }
.screen {
  background: #000; border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden;
  display: flex; flex-direction: column; min-width: 0;
}
.screen .bar {
  display: flex; align-items: center; gap: 8px; padding: 8px 12px;
  background: var(--bg-soft); border-bottom: 1px solid var(--border);
  font-family: var(--mono); font-size: 12px; color: var(--muted);
}
.screen .bar .taglabel { font-weight: 700; }
.screen.console .bar .taglabel { color: var(--accent2); }
.screen.shell   .bar .taglabel { color: var(--accent); }
.screen .bar .uart { margin-left: auto; opacity: .7; }
.term { height: 460px; padding: 8px 6px 6px 10px; }
.term .xterm { height: 100%; }

/* ---- tour ---- */
.tour { margin-top: 22px; background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); }
.tour summary {
  cursor: pointer; padding: 14px 18px; font-weight: 600; color: var(--accent3);
  list-style: none; display: flex; align-items: center; gap: 8px;
}
.tour summary::-webkit-details-marker { display: none; }
.tour summary::before { content: "▸"; transition: .15s; }
.tour[open] summary::before { transform: rotate(90deg); }
.tour .body { padding: 0 18px 18px; }
.steps { display: grid; gap: 10px; margin: 6px 0 14px; }
.step {
  display: flex; gap: 12px; align-items: flex-start;
  border: 1px solid var(--border); border-radius: 10px; padding: 10px 12px; background: #0c1322;
  opacity: .5; transition: .25s;
}
.step.active { opacity: 1; border-color: var(--accent3); }
.step.done   { opacity: .85; }
.step .num {
  font-family: var(--mono); font-size: 12px; color: var(--bg); background: var(--muted);
  min-width: 22px; height: 22px; border-radius: 6px; display: grid; place-items: center; font-weight: 700;
}
.step.active .num { background: var(--accent3); }
.step.done .num { background: var(--accent2); }
.step h4 { margin: 0 0 2px; font-size: 14px; }
.step p { margin: 0; font-size: 13px; color: var(--muted); }
.tour h3 { margin: 16px 0 8px; font-size: 15px; }
.tour ul { margin: 0; padding-left: 18px; color: #b6c2d6; font-size: 13.5px; }
.tour code { font-family: var(--mono); background: #0c1322; padding: 1px 5px; border-radius: 5px; color: var(--accent); }

/* ---- launch overlay ---- */
.overlay {
  position: fixed; inset: 0; background: rgba(6,9,15,.86); backdrop-filter: blur(4px);
  display: grid; place-items: center; z-index: 50; text-align: center; padding: 20px;
}
.overlay .box { max-width: 520px; }
.overlay h2 { font-size: 22px; margin: 0 0 8px; }
.overlay p { color: var(--muted); font-size: 14px; }
.overlay .launch {
  margin-top: 18px; font-size: 16px; padding: 13px 26px;
}
.hidden { display: none !important; }
footer { margin-top: 36px; color: var(--muted); font-size: 12.5px; text-align: center; }