:root {
  --bg: #05111f;
  --bg-elev: #0a1d33;
  --bg-glass: rgba(14, 32, 54, 0.65);
  --bg-glass-strong: rgba(14, 32, 54, 0.85);
  --ink: #e6edf6;
  --ink-muted: #8aa0bd;
  --ink-soft: #b8c7dd;
  --line: rgba(120, 180, 220, 0.14);
  --line-strong: rgba(120, 180, 220, 0.28);
  --cyan: #22d3ee;
  --cyan-soft: #67e8f9;
  --cyan-deep: #0891b2;
  --blue: #60a5fa;
  --gradient: linear-gradient(135deg, #0891b2 0%, #22d3ee 45%, #60a5fa 100%);
  --gradient-soft: linear-gradient(135deg, rgba(8,145,178,0.15) 0%, rgba(34,211,238,0.12) 50%, rgba(96,165,250,0.15) 100%);
  --pass: #4ade80;
  --fail: #f87171;
  --serif: "Iowan Old Style", "Charter", "Georgia", serif;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --radius: 14px;
  --shadow: 0 10px 40px rgba(0, 0, 0, 0.35);
}

* { box-sizing: border-box; }
html, body {
  margin: 0; padding: 0;
  background: var(--bg);
  color: var(--ink);
  min-height: 100vh;
}
body {
  font-family: var(--sans);
  line-height: 1.55;
  background-image:
    radial-gradient(ellipse at 20% -10%, rgba(8, 145, 178, 0.25), transparent 55%),
    radial-gradient(ellipse at 85% 5%, rgba(96, 165, 250, 0.16), transparent 55%),
    radial-gradient(ellipse at 50% 110%, rgba(34, 211, 238, 0.12), transparent 60%);
  background-attachment: fixed;
}

a { color: var(--cyan-soft); text-decoration: none; transition: color 0.15s ease; }
a:hover { color: var(--cyan); }

/* ---- Header / brand / track badge ---- */
header {
  display: flex; justify-content: space-between; align-items: center;
  padding: 1rem 2rem;
  border-bottom: 1px solid var(--line);
  background: rgba(5, 17, 31, 0.78);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  position: sticky; top: 0; z-index: 10;
  gap: 1.5rem;
}
.brand-wrap { display: flex; align-items: center; gap: 1rem; min-width: 0; }
.brand-mark {
  display: inline-flex; align-items: center; gap: 0.55rem;
  color: var(--ink); text-decoration: none;
}
.brand-text {
  font-family: var(--serif);
  font-size: 1.2rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.track-badge {
  display: inline-flex; align-items: center; gap: 0.45rem;
  padding: 0.3rem 0.7rem;
  background: rgba(34, 211, 238, 0.08);
  border: 1px solid rgba(34, 211, 238, 0.35);
  border-radius: 999px;
  font-size: 0.72rem; font-weight: 500;
  color: var(--cyan-soft);
  text-transform: uppercase; letter-spacing: 0.08em;
  white-space: nowrap;
}
.track-badge-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 10px var(--cyan);
}
nav { display: flex; gap: 0.5rem; flex-wrap: wrap; }
nav a {
  padding: 0.4rem 0.75rem;
  color: var(--ink-soft);
  font-size: 0.92rem;
  letter-spacing: 0.01em;
  border-radius: 6px;
  transition: background 0.15s ease, color 0.15s ease;
}
nav a:hover { color: var(--ink); background: rgba(34, 211, 238, 0.06); }

main { max-width: 76ch; margin: 0 auto; padding: 3rem 2rem 5rem; }

/* ---- Track header (above H1 on sub pages) ---- */
.track-header {
  display: flex; flex-wrap: wrap; align-items: center; gap: 0.5rem;
  margin-bottom: 1.25rem;
}
.outline-badge {
  display: inline-flex; align-items: center; gap: 0.4rem;
  padding: 0.3rem 0.7rem;
  background: rgba(250, 204, 21, 0.08);
  border: 1px solid rgba(250, 204, 21, 0.35);
  border-radius: 999px;
  font-size: 0.72rem; font-weight: 500;
  color: #fde68a;
  text-transform: uppercase; letter-spacing: 0.08em;
  white-space: nowrap;
}

/* ---- Home / hero ---- */
.hero { padding: 3rem 0 2.5rem; }
.hero-eyebrow {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.35rem 0.85rem;
  background: rgba(34, 211, 238, 0.08);
  border: 1px solid rgba(34, 211, 238, 0.25);
  border-radius: 999px;
  font-size: 0.78rem;
  color: var(--cyan-soft);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 1.5rem;
}
.eyebrow-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 12px var(--cyan);
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}
.hero h1 {
  font-family: var(--serif);
  font-size: clamp(2.5rem, 6vw, 4.25rem);
  line-height: 1;
  letter-spacing: -0.02em;
  margin: 0 0 1.25rem;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.lede {
  font-size: 1.2rem;
  color: var(--ink-soft);
  max-width: 58ch;
  line-height: 1.6;
  margin: 0 0 1rem;
}
.hero-ctas { display: flex; gap: 0.75rem; flex-wrap: wrap; margin-top: 2rem; }
.cta {
  display: inline-block;
  padding: 0.85rem 1.75rem;
  background: var(--gradient);
  color: #041020 !important;
  font-weight: 600;
  letter-spacing: 0.01em;
  border-radius: 999px;
  box-shadow: 0 8px 24px rgba(34, 211, 238, 0.25);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 12px 32px rgba(34, 211, 238, 0.35);
}
.cta-ghost {
  display: inline-block;
  padding: 0.85rem 1.5rem;
  background: transparent;
  border: 1px solid var(--line-strong);
  color: var(--ink) !important;
  font-weight: 500;
  border-radius: 999px;
  transition: border-color 0.15s ease, color 0.15s ease;
}
.cta-ghost:hover {
  border-color: var(--cyan);
  color: var(--cyan) !important;
}
.hero-viz {
  margin: 2.5rem 0 1rem;
  padding: 1rem;
  background: var(--bg-glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}
.hero-viz svg { width: 100%; height: auto; display: block; }

/* ---- How it works ---- */
.how { margin-top: 3rem; }
.how h2 {
  font-family: var(--serif);
  font-size: 1.5rem;
  color: var(--ink);
  margin: 0 0 1rem;
}
.how ol {
  list-style: none; counter-reset: step;
  padding: 0; margin: 0;
  display: grid; gap: 0.75rem;
}
.how li {
  counter-increment: step;
  padding: 1rem 1.25rem 1rem 3.5rem;
  background: var(--bg-glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--ink-soft);
  position: relative;
  font-size: 0.98rem;
}
.how li::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 1rem; top: 1rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.75rem; font-weight: 600;
  color: var(--cyan);
  background: rgba(34, 211, 238, 0.1);
  border: 1px solid rgba(34, 211, 238, 0.3);
  border-radius: 6px;
  padding: 0.15rem 0.45rem;
}

/* ---- Sub-heading paragraph ---- */
.sub {
  color: var(--ink-soft);
  font-size: 1rem;
  line-height: 1.6;
  max-width: 62ch;
  margin: 0 0 2rem;
}

/* ---- Track cards (home's "other tracks" + /tracks page) ---- */
.track-other { margin-top: 4rem; }
.track-other h2 {
  font-family: var(--serif);
  font-size: 1.5rem;
  color: var(--ink);
  margin: 0 0 0.5rem;
}
.track-other .sub { margin-bottom: 1.5rem; }
.track-list {
  list-style: none; padding: 0; margin: 0;
  display: grid; gap: 0.85rem;
}
.track-list-lg { gap: 1rem; }
.track-card {
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-rows: auto auto auto;
  grid-template-areas:
    "tag tag"
    "title title"
    "desc desc";
  gap: 0.35rem;
  padding: 1.25rem 1.4rem;
  background: var(--bg-glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.track-card:hover { border-color: var(--line-strong); transform: translateY(-1px); }
.track-card.active {
  border: 1px solid rgba(34, 211, 238, 0.4);
  background: var(--gradient-soft), var(--bg-glass);
}
.track-card.coming { opacity: 0.7; }
.track-tag {
  grid-area: tag; justify-self: start;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.7rem; letter-spacing: 0.08em; text-transform: uppercase;
  padding: 0.2rem 0.55rem;
  border-radius: 6px;
  background: rgba(120, 180, 220, 0.08);
  border: 1px solid var(--line);
  color: var(--ink-muted);
}
.track-tag.active {
  color: var(--cyan);
  background: rgba(34, 211, 238, 0.1);
  border-color: rgba(34, 211, 238, 0.4);
}
.track-card strong {
  grid-area: title;
  font-family: var(--serif);
  font-size: 1.25rem;
  color: var(--ink);
  font-weight: 600;
}
.track-desc {
  grid-area: desc;
  color: var(--ink-soft);
  font-size: 0.95rem;
  line-height: 1.55;
}
.track-link {
  grid-column: 1 / -1;
  margin-top: 0.5rem;
  color: var(--cyan-soft);
  font-size: 0.92rem; font-weight: 500;
}

/* ---- Modules list ---- */
h1 {
  font-family: var(--serif);
  font-size: 2.25rem;
  letter-spacing: -0.01em;
  margin: 0 0 0.75rem;
  color: var(--ink);
}
.modules { list-style: none; padding: 0; margin: 0; display: grid; gap: 0.65rem; }
.module {
  display: flex; align-items: center; gap: 1rem;
  padding: 1.1rem 1.25rem;
  background: var(--bg-glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.module:hover:not(.locked) {
  border-color: rgba(34, 211, 238, 0.4);
  transform: translateY(-1px);
}
.module .num {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.78rem; font-weight: 600;
  color: var(--cyan);
  background: rgba(34, 211, 238, 0.08);
  border: 1px solid rgba(34, 211, 238, 0.3);
  border-radius: 6px;
  padding: 0.2rem 0.5rem;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.05em;
}
.module a {
  color: var(--ink); flex: 1;
  font-size: 1.05rem; font-weight: 500;
}
.module a:hover { color: var(--cyan-soft); }
.module .status {
  font-size: 0.7rem;
  color: var(--ink-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 500;
}
.module.locked { opacity: 0.7; }
.module.locked a { color: var(--ink-soft); }
.module.locked a:hover { color: var(--cyan-soft); }
.module.locked .num { color: var(--ink-muted); border-color: var(--line); background: transparent; }

/* ---- Reading (module prose) ---- */
.reading {
  font-family: var(--serif);
  font-size: 1.08rem; line-height: 1.75;
  color: var(--ink-soft);
  padding: 2rem 0;
}
.reading h1 {
  font-family: var(--serif);
  font-size: clamp(2rem, 4vw, 2.75rem); line-height: 1.1;
  margin: 1rem 0 1.5rem;
  background: var(--gradient);
  -webkit-background-clip: text; background-clip: text;
  color: transparent;
}
.reading h2 {
  font-family: var(--serif);
  font-size: 1.5rem; color: var(--ink);
  margin: 2.75rem 0 0.5rem;
  padding-top: 1.25rem; border-top: 1px solid var(--line);
}
.reading h3 {
  font-family: var(--serif);
  font-size: 1.2rem; color: var(--ink);
  margin: 2rem 0 0.4rem;
}
.reading p { margin: 1rem 0; }
.reading ul, .reading ol { margin: 1rem 0 1rem 1.5rem; }
.reading li { margin: 0.4rem 0; }
.reading strong { color: var(--ink); }
.reading em { color: var(--cyan-soft); font-style: normal; }
.reading code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.9em;
  background: rgba(34, 211, 238, 0.08);
  border: 1px solid rgba(34, 211, 238, 0.18);
  padding: 0.1rem 0.35rem;
  border-radius: 4px;
  color: var(--cyan-soft);
}
.reading pre {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.88rem; line-height: 1.55;
  background: var(--bg-elev);
  border: 1px solid var(--line);
  padding: 1rem 1.15rem;
  border-radius: var(--radius);
  overflow-x: auto;
  white-space: pre;
  color: var(--ink-soft);
  margin: 1.25rem 0;
}
.reading pre code {
  background: transparent; border: 0; padding: 0; color: inherit;
}

.module-footer {
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 1rem;
  margin-top: 3rem; padding-top: 1.25rem;
  border-top: 1px solid var(--line);
  font-size: 0.95rem;
}
.module-footer a { color: var(--cyan-soft); }
.cta-inline { font-weight: 600; }

/* ---- Forms (login, ask, corpus upload) ---- */
form {
  margin-top: 1.5rem;
  display: flex; flex-direction: column; gap: 1rem;
  max-width: 42rem;
}
form label {
  display: flex; flex-direction: column; gap: 0.45rem;
  font-size: 0.8rem;
  color: var(--ink-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 500;
}
form input, form textarea, form select {
  font-family: var(--sans);
  font-size: 1rem;
  padding: 0.75rem 0.95rem;
  background: var(--bg-glass-strong);
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  color: var(--ink);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
  text-transform: none; letter-spacing: normal;
}
form input:focus, form textarea:focus, form select:focus {
  outline: none;
  border-color: var(--cyan);
  box-shadow: 0 0 0 3px rgba(34, 211, 238, 0.15);
}
form textarea {
  font-family: var(--serif);
  font-size: 1.05rem;
  line-height: 1.55;
  resize: vertical;
  min-height: 7rem;
}
form button {
  align-self: flex-start;
  background: var(--gradient);
  color: #041020;
  border: 0;
  padding: 0.8rem 1.75rem;
  border-radius: 999px;
  font-family: var(--sans);
  font-size: 0.95rem; font-weight: 600;
  cursor: pointer;
  transition: transform 0.12s ease, box-shadow 0.15s ease;
}
form button:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 24px rgba(34, 211, 238, 0.3);
}
form button:disabled {
  background: var(--bg-elev);
  color: var(--ink-muted);
  cursor: wait;
  box-shadow: none;
  transform: none;
}

.row { display: flex; gap: 1rem; }
.row label { flex: 1; }

.msg {
  margin-top: 1rem;
  color: var(--ink-soft);
  font-size: 0.95rem;
  padding: 0.85rem 1.1rem;
  background: var(--bg-glass);
  border-left: 3px solid var(--cyan);
  border-radius: 6px;
}

/* ---- Sources (ask page output) ---- */
.sources { list-style: none; padding: 0; margin: 1.5rem 0; display: grid; gap: 0.65rem; }
.sources li {
  padding: 0.9rem 1.1rem;
  background: var(--bg-glass);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--line);
  border-radius: 10px;
}
.src-id {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-weight: 600;
  color: var(--cyan-soft);
  font-size: 0.88rem;
}
.src-score {
  float: right;
  color: var(--ink-muted);
  font-variant-numeric: tabular-nums;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.82rem;
}
.src-text {
  margin-top: 0.55rem;
  font-family: var(--serif);
  font-size: 0.95rem;
  line-height: 1.55;
  color: var(--ink-soft);
  white-space: pre-wrap;
}
.metrics {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.82rem;
  background: var(--bg-elev);
  border: 1px solid var(--line);
  padding: 0.9rem 1.1rem;
  border-radius: 10px;
  color: var(--ink-soft);
  margin-top: 1rem;
}

/* ---- Footer ---- */
footer {
  display: flex; justify-content: space-between; align-items: center;
  padding: 1.75rem 2rem;
  margin-top: 4rem;
  border-top: 1px solid var(--line);
  color: var(--ink-muted);
  font-size: 0.85rem;
  letter-spacing: 0.02em;
  flex-wrap: wrap; gap: 0.75rem;
}
.footer-brand { display: inline-flex; align-items: center; gap: 0.6rem; }
.footer-sep { opacity: 0.4; }
.footer-track { color: var(--cyan-soft); }

@media (max-width: 700px) {
  header { padding: 0.85rem 1rem; flex-wrap: wrap; }
  .brand-wrap { flex-wrap: wrap; gap: 0.6rem; }
  nav { order: 3; width: 100%; padding-top: 0.5rem; }
  nav a { padding: 0.35rem 0.55rem; font-size: 0.85rem; }
  main { padding: 2rem 1.25rem 4rem; }
  .hero { padding: 2rem 0 1rem; }
  .hero-ctas { flex-direction: column; align-items: stretch; }
  .cta, .cta-ghost { text-align: center; }
  .row { flex-direction: column; }
  footer { padding: 1.5rem 1.25rem; flex-direction: column; align-items: flex-start; }
}