/* SAIT-inspired theme */
:root {
  --bg: #ffffff;
  --page: #f8f9fa;
  --card: #ffffff;
  --text: #0f172a; /* dark text */
  --muted: #6b7280; /* muted gray */
  --accent: #b31b1b; /* SAIT red-ish */
  --accent-2: #ef4444; /* action red */
  --card-border: #e6e9ef;
  --shadow: 0 6px 18px rgba(17,24,39,0.07);
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--page);
  color: var(--text);
  font-family: Inter, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
header, footer { padding: 0; }

.container { max-width: 2300px; margin: 0 auto; padding: 0 1.25rem; }

.topbar {
  background: var(--accent);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  padding: 0.35rem 0;
}
.topbar .logo-link { display:flex; align-items:center; margin-left: 1rem; }
.logo-img { height: 44px; width: auto; display: block; margin: 6px 0; }
/* Header styling */
.site-header { background: linear-gradient(180deg, rgba(179,27,27,0.06), transparent); padding: 1.25rem 0; border-bottom: 1px solid var(--card-border); }
.site-header h1 { margin: 0 0 .125rem 0; font-weight: 700; font-size: 1.65rem; }
.site-header p { color: var(--muted); margin: 0 0 0.25rem 0; }

.main, main { padding: 0 0 2rem; }
.controls, .summary, .plots, .notes { margin-top: 1rem; }
/* content grid */
.controls .grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
}
.control {
  background: var(--card);
  padding: 1rem;
  border-radius: .75rem;
  border: 1px solid var(--card-border);
  box-shadow: var(--shadow);
}
.control label { display: block; margin-bottom: .5rem; font-weight: 600; color: var(--text); }
.control input[type=range] { width: 100%; }
.control input[type=range] { -webkit-appearance: none; height: 6px; border-radius: 999px; background: linear-gradient(90deg, var(--accent) 0%, var(--accent) 50%, #e5e7eb 50%); }
.control input[type=range]::-webkit-slider-thumb { -webkit-appearance: none; width: 18px; height: 18px; border-radius: 50%; background: var(--accent); border: 4px solid #fff; box-shadow: 0 2px 6px rgba(0,0,0,0.15); }
.control input[type=range]::-moz-range-thumb { width: 18px; height: 18px; border-radius: 50%; background: var(--accent); border: 4px solid #fff; box-shadow: 0 2px 6px rgba(0,0,0,0.15); }
.control input[type=number] { width: 100%; padding: .5rem; border-radius: .5rem; border: 1px solid var(--card-border); background: #fff; color: var(--text); }
.control span { display: inline-block; margin-top: .25rem; color: var(--muted); }

.muted { color: var(--muted); }
.advanced summary { cursor: pointer; }

.actions { display: flex; gap: .5rem; align-items: center; }
button {
  padding: .6rem 1rem;
  border-radius: .6rem;
  border: none;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 8px 18px rgba(179,27,27,0.14);
}
button.secondary { background: transparent; color: var(--accent); border: 1px solid var(--card-border); }
button:disabled { opacity: .6; cursor: not-allowed; }

.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1rem; }
.card { background: var(--card); padding: 1rem; border-radius: .75rem; border: 1px solid var(--card-border); box-shadow: var(--shadow); }
.card h3 { margin-top: 0; }
.card h3 { margin-top: 0; }

.plots { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 1rem; align-items: start; }
.plot { background: var(--card); padding: .5rem; border-radius: .75rem; border: 1px solid var(--card-border); box-shadow: var(--shadow); }
.plot { position: relative; }
.plot-header { display:flex; justify-content:space-between; align-items:center; padding:0 .5rem .5rem .5rem; color:var(--muted); }
.plot-header .toggle-plot { background:transparent; border:none; color:var(--muted); font-weight:700; cursor:pointer; font-size:1.2rem; }
.plot-content { padding: 0.5rem; }
.plot.minimized .plot-content { display:none; }

footer { color: var(--muted); padding: 1.25rem 0; border-top: 1px solid var(--card-border); background: #fff; }

/* small utilities */
.small-row { display:flex; align-items:center; gap:.5rem; }
.spacer { flex: 1 1 auto; }

@media (max-width: 640px) {
  .site-header h1 { font-size: 1.25rem; }
  .logo-img { height: 38px; }
}

/* anchors and small UI elements */
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
input:focus, select:focus, button:focus { outline: 3px solid rgba(179,27,27,0.12); }
code { background: #f3f4f6; padding: 0 .2rem; border-radius: 3px; color: var(--text); }