/* ------------------------------------------------------------------
   Accelerated AI Progress — standalone (no Streamlit) styles
   Clean card / pill-tab aesthetic; sidebar-controls + main-content
   layout mirroring the original Streamlit app.
------------------------------------------------------------------ */

:root {
  --blue: #1a56f0;
  --blue-dark: #1442c4;
  --blue-soft: #eaf0ff;
  --ink: #1b1f27;
  --ink-soft: #48505e;
  --muted: #6b7280;
  --line: #e5e7eb;
  --line-soft: #eef0f3;
  --bg: #f4f5f7;
  --card: #ffffff;
  --green-bg: #eaf7ee;
  --green-line: #b6e2c2;
  --green-ink: #1e7a3d;
  --radius: 14px;
  --shadow: 0 1px 3px rgba(16, 24, 40, 0.06), 0 1px 2px rgba(16, 24, 40, 0.04);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }

.page {
  max-width: 1180px;
  margin: 0 auto;
  padding: 28px 22px 80px;
}

/* ---- Header ---- */
.app-header { text-align: left; margin-bottom: 18px; }
.app-header h1 {
  font-size: 30px;
  line-height: 1.15;
  margin: 0 0 6px;
  letter-spacing: -0.01em;
}
.app-header .subtitle { color: var(--muted); font-size: 15px; margin: 0; }

/* ---- Top pill tab bar (replaces sidebar dropdown) ---- */
.tabbar {
  display: flex;
  gap: 6px;
  background: var(--card);
  border: 2px solid var(--blue);
  border-radius: 999px;
  padding: 6px;
  margin: 0 0 22px;
  box-shadow: var(--shadow);
}
.tabbar button {
  flex: 1 1 0;
  appearance: none;
  border: none;
  background: transparent;
  color: var(--blue);
  font-family: var(--font);
  font-size: 17px;
  font-weight: 700;
  padding: 12px 18px;
  border-radius: 999px;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
}
.tabbar button:hover { background: var(--blue-soft); }
.tabbar button.active {
  background: var(--blue);
  color: #fff;
}
.tabbar button.active:hover { background: var(--blue-dark); }

/* ---- Two-column layout ---- */
.layout {
  display: grid;
  grid-template-columns: 340px 1fr;
  gap: 22px;
  align-items: start;
}
@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
}

/* ---- Cards ---- */
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px 22px;
}
.sidebar { position: sticky; top: 18px; }
@media (max-width: 900px) {
  .sidebar { position: static; }
}

.sidebar h2 {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin: 4px 0 14px;
}
.group-label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  font-weight: 700;
  margin: 20px 0 10px;
  padding-top: 14px;
  border-top: 1px solid var(--line-soft);
}
.group-label:first-of-type { border-top: none; padding-top: 0; margin-top: 6px; }

/* ---- Controls ---- */
.control { margin-bottom: 15px; }
.control label.field-label {
  display: block;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--ink-soft);
  margin-bottom: 6px;
}
.info {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 15px; height: 15px;
  margin-left: 5px;
  border-radius: 50%;
  background: var(--line);
  color: var(--muted);
  font-size: 10px;
  font-weight: 700;
  cursor: help;
  vertical-align: middle;
}
.info:hover { background: var(--blue); color: #fff; }
.info.no-tip { display: none; }

/* Custom immediate hover tooltip (replaces the slow native title tooltip) */
.info[data-tip]:hover::after {
  content: attr(data-tip);
  position: absolute;
  left: 50%;
  top: calc(100% + 9px);
  transform: translateX(-50%);
  width: 230px;
  max-width: 230px;
  background: #1b1f27;
  color: #fff;
  padding: 9px 11px;
  border-radius: 8px;
  font-size: 12px;
  font-weight: 400;
  line-height: 1.45;
  text-align: left;
  white-space: normal;
  z-index: 60;
  box-shadow: 0 6px 20px rgba(16, 24, 40, 0.22);
  pointer-events: none;
}
.info[data-tip]:hover::before {
  content: '';
  position: absolute;
  left: 50%;
  top: calc(100% + 3px);
  transform: translateX(-50%);
  border: 6px solid transparent;
  border-bottom-color: #1b1f27;
  z-index: 60;
  pointer-events: none;
}
.control input[type="number"] {
  width: 100%;
  padding: 9px 11px;
  font-size: 14px;
  font-family: var(--font);
  color: var(--ink);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 9px;
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
.control input[type="number"]:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px var(--blue-soft);
}
.control input[type="number"]:disabled {
  background: #f2f3f5;
  color: #9aa1ac;
  cursor: not-allowed;
}

.checkbox-row {
  display: flex;
  align-items: flex-start;
  gap: 9px;
  margin: 12px 0;
  font-size: 14px;
  color: var(--ink-soft);
}
.checkbox-row input[type="checkbox"] {
  width: 17px; height: 17px;
  margin: 1px 0 0;
  accent-color: var(--blue);
  cursor: pointer;
  flex: 0 0 auto;
}
.checkbox-row label { cursor: pointer; }

.run-btn {
  width: 100%;
  appearance: none;
  border: none;
  background: var(--blue);
  color: #fff;
  font-family: var(--font);
  font-size: 15px;
  font-weight: 700;
  padding: 12px 16px;
  border-radius: 10px;
  cursor: pointer;
  margin: 6px 0 16px;
  transition: background 0.15s ease;
}
.run-btn:hover { background: var(--blue-dark); }
.run-btn:disabled { background: #9db4f5; cursor: default; }

.hidden { display: none !important; }

/* ---- Main content ---- */
.content .prose { font-size: 15.5px; color: var(--ink-soft); }
.content .prose p { margin: 0 0 14px; }
.content h2.section {
  font-size: 22px;
  margin: 26px 0 10px;
  letter-spacing: -0.01em;
}
.content h3.subsection {
  font-size: 18px;
  margin: 22px 0 8px;
}
.content ul { margin: 0 0 14px; padding-left: 20px; }
.content li { margin-bottom: 6px; }

.note {
  font-style: italic;
  color: var(--muted);
  font-size: 14px;
  margin: 8px 2px 4px;
}

/* ---- Explosion / info box ---- */
.infobox {
  background: var(--green-bg);
  border: 1px solid var(--green-line);
  color: var(--green-ink);
  border-radius: 10px;
  padding: 12px 16px;
  font-size: 14.5px;
  margin: 10px 0 18px;
}
.infobox.neutral {
  background: #eef2ff;
  border-color: #cdd7ff;
  color: #2740a6;
}

/* ---- Plot cards ---- */
.plot-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 12px 14px 6px;
  margin: 0 0 18px;
}
.plot { width: 100%; height: 420px; }

/* ---- Results table ---- */
table.result-table, table.params-table {
  width: 100%;
  border-collapse: collapse;
  margin: 8px 0 18px;
  font-size: 14.5px;
  background: var(--card);
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid var(--line);
}
table.result-table th, table.result-table td,
table.params-table th, table.params-table td {
  border: 1px solid var(--line);
  padding: 9px 12px;
  text-align: left;
  vertical-align: top;
}
table.result-table th, table.params-table th {
  background: #f7f8fa;
  font-weight: 700;
  color: var(--ink);
}
table.result-table td:first-child { font-weight: 600; }
.params-table td:nth-child(3),
.params-table td:nth-child(4),
.params-table td:nth-child(5) { text-align: center; white-space: nowrap; }

.download-btn {
  display: inline-block;
  background: #fff;
  color: var(--blue);
  border: 1.5px solid var(--blue);
  border-radius: 9px;
  padding: 9px 16px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  margin: 4px 0 8px;
  transition: background 0.15s ease;
}
.download-btn:hover { background: var(--blue-soft); }

.placeholder {
  color: var(--muted);
  font-size: 15px;
  padding: 40px 8px;
  text-align: center;
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  background: #fbfcfd;
}

.progress-wrap {
  height: 8px;
  background: var(--line);
  border-radius: 999px;
  overflow: hidden;
  margin: 12px 0;
}
.progress-bar {
  height: 100%;
  width: 0%;
  background: var(--blue);
  transition: width 0.05s linear;
}

/* ---- Inline math ---- */
.m { font-family: "Cambria Math", "Times New Roman", Georgia, serif; font-style: italic; }
.m sub { font-style: normal; }
.mathblock {
  font-family: "Cambria Math", "Times New Roman", Georgia, serif;
  font-size: 18px;
  text-align: center;
  margin: 14px 0;
  color: var(--ink);
}
.mathblock .m { font-size: 19px; }

/* ---- Speed-up calculator hero ---- */
.speedup-hero {
  text-align: center;
  background: linear-gradient(135deg, #eef3ff 0%, #f7f9ff 100%);
  border: 1px solid #cdd9ff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 30px 24px 26px;
  margin: 4px 0 22px;
}
.speedup-label {
  font-size: 14px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
  margin-bottom: 6px;
}
.speedup-value {
  font-size: 68px;
  line-height: 1.05;
  font-weight: 800;
  color: var(--blue);
  letter-spacing: -0.02em;
}
.speedup-value.explosion { font-size: 46px; color: #b21f2d; }
.speedup-sub {
  margin-top: 8px;
  font-size: 15px;
  color: var(--ink-soft);
  font-family: "Cambria Math", "Times New Roman", Georgia, serif;
}
.mathblock sup { font-style: normal; }

/* inline stacked fraction */
.frac {
  display: inline-flex;
  flex-direction: column;
  vertical-align: middle;
  text-align: center;
  margin: 0 0.22em;
}
.frac > .num { border-bottom: 1px solid currentColor; padding: 0 0.4em; }
.frac > .den { padding: 0 0.4em; }

.footer {
  margin-top: 40px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
}