/* ── Reset & Base ────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:        #f8f9fb;
  --surface:   #ffffff;
  --border:    #e2e6ea;
  --text:      #1c1e26;
  --muted:     #6b7280;
  --accent:    #2563eb;
  --accent-bg: #eff6ff;
  --code-bg:   #f1f5f9;
  --radius:    8px;
  --shadow:    0 1px 4px rgba(0,0,0,.07), 0 4px 16px rgba(0,0,0,.05);

  /* Theory colours */
  --cft:  #2563eb;
  --gft:  #16a34a;
  --qst:  #7c3aed;
  --ict:  #ea580c;
  --tst:  #dc2626;
  --dct:  #0891b2;
}

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  font-size: 16px;
}

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

code, kbd {
  font-family: "SF Mono", "Fira Code", Consolas, monospace;
  font-size: .875em;
  background: var(--code-bg);
  padding: .15em .4em;
  border-radius: 4px;
  border: 1px solid var(--border);
}

pre {
  background: #0d1117;
  color: #e6edf3;
  padding: 1.2rem 1.5rem;
  border-radius: var(--radius);
  overflow-x: auto;
  font-family: "SF Mono", "Fira Code", Consolas, monospace;
  font-size: .85rem;
  line-height: 1.6;
}
pre code { background: none; border: none; padding: 0; font-size: inherit; color: inherit; }

/* ── Layout ──────────────────────────────────────────────────────────── */
.container { max-width: 1120px; margin: 0 auto; padding: 0 1.5rem; }
.wide      { max-width: 1280px; margin: 0 auto; padding: 0 1.5rem; }

section { padding: 5rem 0; }
section + section { border-top: 1px solid var(--border); }

/* ── Nav ─────────────────────────────────────────────────────────────── */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(248,249,251,.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  padding: .75rem 0;
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.nav-brand {
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: -.02em;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: .5rem;
}
.nav-brand .badge {
  font-size: .7rem;
  background: var(--accent-bg);
  color: var(--accent);
  border: 1px solid #bfdbfe;
  padding: .15em .5em;
  border-radius: 999px;
  font-weight: 600;
}
.nav-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}
.nav-links a {
  font-size: .875rem;
  color: var(--muted);
  font-weight: 500;
}
.nav-links a:hover { color: var(--text); text-decoration: none; }
.nav-github {
  font-size: .8rem;
  font-weight: 600;
  background: var(--text);
  color: #fff;
  padding: .4em .9em;
  border-radius: 6px;
  display: flex;
  align-items: center;
  gap: .4rem;
}
.nav-github:hover { background: #374151; text-decoration: none; }

/* ── Hero ────────────────────────────────────────────────────────────── */
#hero {
  background: linear-gradient(160deg, #0d1117 0%, #1a1f2e 60%, #0f1b3d 100%);
  color: #e6edf3;
  padding: 6rem 0 5rem;
  border-top: none;
}
#hero .eyebrow {
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: #58a6ff;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: .5rem;
}
#hero h1 {
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 800;
  letter-spacing: -.03em;
  line-height: 1.15;
  max-width: 780px;
  margin-bottom: 1.25rem;
}
#hero h1 em { color: #58a6ff; font-style: normal; }
#hero .lead {
  font-size: 1.1rem;
  color: #8b949e;
  max-width: 620px;
  margin-bottom: 2rem;
  line-height: 1.7;
}
.hero-actions { display: flex; gap: .75rem; flex-wrap: wrap; }
.btn-primary {
  background: #2563eb;
  color: #fff;
  padding: .65em 1.4em;
  border-radius: 7px;
  font-weight: 600;
  font-size: .95rem;
  display: inline-flex;
  align-items: center;
  gap: .4rem;
}
.btn-primary:hover { background: #1d4ed8; text-decoration: none; }
.btn-ghost {
  color: #e6edf3;
  border: 1px solid #30363d;
  padding: .65em 1.4em;
  border-radius: 7px;
  font-weight: 500;
  font-size: .95rem;
  display: inline-flex;
  align-items: center;
  gap: .4rem;
}
.btn-ghost:hover { border-color: #8b949e; text-decoration: none; }

.hero-stats {
  display: flex;
  gap: 2.5rem;
  margin-top: 3.5rem;
  flex-wrap: wrap;
}
.stat-item { border-left: 2px solid #30363d; padding-left: 1rem; }
.stat-num { font-size: 1.75rem; font-weight: 800; color: #e6edf3; letter-spacing: -.03em; }
.stat-label { font-size: .78rem; color: #6e7681; text-transform: uppercase; letter-spacing: .06em; }

/* ── Section headers ─────────────────────────────────────────────────── */
.section-header { margin-bottom: 2.5rem; }
.section-label {
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: .5rem;
}
.section-header h2 {
  font-size: clamp(1.6rem, 3vw, 2.25rem);
  font-weight: 800;
  letter-spacing: -.03em;
  line-height: 1.2;
}
.section-header p {
  margin-top: .6rem;
  color: var(--muted);
  max-width: 600px;
  font-size: 1rem;
}

/* ── Theories grid ───────────────────────────────────────────────────── */
.theories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.25rem;
}
.theory-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.5rem;
  box-shadow: var(--shadow);
  border-top: 3px solid var(--c, var(--accent));
  transition: transform .15s, box-shadow .15s;
}
.theory-card:hover { transform: translateY(-2px); box-shadow: 0 4px 20px rgba(0,0,0,.1); }
.theory-card[data-theory="CFT"] { --c: var(--cft); }
.theory-card[data-theory="GFT"] { --c: var(--gft); }
.theory-card[data-theory="QST"] { --c: var(--qst); }
.theory-card[data-theory="ICT"] { --c: var(--ict); }
.theory-card[data-theory="TST"] { --c: var(--tst); }
.theory-card[data-theory="DCT"] { --c: var(--dct); }

.theory-tag {
  display: inline-block;
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--c);
  background: color-mix(in srgb, var(--c) 10%, transparent);
  padding: .2em .6em;
  border-radius: 4px;
  margin-bottom: .75rem;
}
.theory-card h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: .4rem; }
.theory-card .mechanism {
  font-size: .82rem;
  color: var(--muted);
  font-style: italic;
  margin-bottom: .85rem;
  line-height: 1.5;
}
.theory-card .prediction-list {
  list-style: none;
  font-size: .85rem;
}
.theory-card .prediction-list li {
  padding: .25rem 0;
  padding-left: 1.1rem;
  position: relative;
  color: #374151;
}
.theory-card .prediction-list li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--c);
  font-size: .8em;
}
.theory-params {
  margin-top: .85rem;
  padding-top: .85rem;
  border-top: 1px solid var(--border);
  font-size: .8rem;
  color: var(--muted);
}
.theory-params code { font-size: .8rem; }

/* ── Results ─────────────────────────────────────────────────────────── */
.results-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: start;
}
@media (max-width: 768px) { .results-layout { grid-template-columns: 1fr; } }

.result-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.5rem;
  box-shadow: var(--shadow);
}
.result-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: .25rem; }
.result-card .subtitle { font-size: .82rem; color: var(--muted); margin-bottom: 1.2rem; }

.ranking-row {
  display: flex;
  align-items: center;
  gap: .75rem;
  padding: .6rem 0;
  border-bottom: 1px solid var(--border);
}
.ranking-row:last-child { border-bottom: none; }
.rank-num {
  width: 1.5rem;
  text-align: center;
  font-size: .8rem;
  font-weight: 700;
  color: var(--muted);
}
.rank-num.gold { color: #d97706; }
.theory-pill {
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .05em;
  padding: .2em .6em;
  border-radius: 4px;
  min-width: 42px;
  text-align: center;
}
.nmi-bar-wrap { flex: 1; }
.nmi-bar-label { font-size: .75rem; color: var(--muted); margin-bottom: .2rem; }
.nmi-bar-outer { height: 6px; background: var(--border); border-radius: 3px; overflow: hidden; }
.nmi-bar-inner { height: 100%; border-radius: 3px; }
.nmi-score { font-size: .85rem; font-weight: 700; min-width: 3.5rem; text-align: right; }

/* ── Scenario pills ──────────────────────────────────────────────────── */
.scenario-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}
.scenario-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.2rem;
  box-shadow: var(--shadow);
}
.scenario-card .icon { font-size: 1.5rem; margin-bottom: .5rem; }
.scenario-card h4 { font-size: .9rem; font-weight: 700; }
.scenario-card p  { font-size: .8rem; color: var(--muted); margin-top: .25rem; }

/* ── Methodology ─────────────────────────────────────────────────────── */
.method-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1rem;
}
.method-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.25rem;
  box-shadow: var(--shadow);
}
.method-card .m-label {
  font-size: .7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--accent);
  margin-bottom: .4rem;
}
.method-card h4 { font-size: .95rem; font-weight: 700; margin-bottom: .4rem; }
.method-card p  { font-size: .83rem; color: var(--muted); line-height: 1.55; }
.issue-ref {
  margin-top: .75rem;
  font-size: .75rem;
  color: #9ca3af;
}
.issue-ref a { color: var(--accent); }

/* ── Limitations ─────────────────────────────────────────────────────── */
.limitations-list {
  display: flex;
  flex-direction: column;
  gap: .75rem;
}
.limitation-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 3px solid var(--c, #e5e7eb);
  border-radius: 0 8px 8px 0;
  padding: 1rem 1.25rem;
}
.limitation-item.open    { --c: #f59e0b; }
.limitation-item.wip     { --c: #3b82f6; }
.limitation-item.closed  { --c: #22c55e; opacity: .7; }
.limitation-meta {
  display: flex;
  align-items: center;
  gap: .6rem;
  margin-bottom: .35rem;
  flex-wrap: wrap;
}
.lim-issue  { font-size: .75rem; font-weight: 700; color: var(--muted); }
.lim-status {
  font-size: .68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .07em;
  padding: .15em .5em;
  border-radius: 4px;
}
.status-open   { background: #fef3c7; color: #92400e; }
.status-wip    { background: #eff6ff; color: #1e40af; }
.status-closed { background: #dcfce7; color: #166534; }
.limitation-item h4 { font-size: .9rem; font-weight: 700; margin-bottom: .3rem; }
.limitation-item p  { font-size: .82rem; color: var(--muted); line-height: 1.55; }

/* ── Dev log ─────────────────────────────────────────────────────────── */
.devlog { background: #0d1117; color: #e6edf3; }
.devlog .section-label { color: #58a6ff; }
.devlog .section-header h2 { color: #e6edf3; }
.devlog .section-header p  { color: #6e7681; }

.log-entries {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-left: 2px solid #21262d;
  margin-left: .5rem;
}
.log-entry {
  padding: 0 0 2rem 2rem;
  position: relative;
}
.log-entry::before {
  content: "";
  width: 10px;
  height: 10px;
  background: #21262d;
  border: 2px solid #30363d;
  border-radius: 50%;
  position: absolute;
  left: -6px;
  top: .3rem;
}
.log-entry.latest::before { background: #58a6ff; border-color: #58a6ff; }
.log-date {
  font-size: .72rem;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: #6e7681;
  margin-bottom: .35rem;
  font-family: "SF Mono", monospace;
}
.log-entry h4 { font-size: .95rem; font-weight: 700; color: #e6edf3; margin-bottom: .35rem; }
.log-entry p  { font-size: .85rem; color: #8b949e; line-height: 1.6; }
.log-tags {
  display: flex;
  gap: .4rem;
  flex-wrap: wrap;
  margin-top: .5rem;
}
.log-tag {
  font-size: .68rem;
  font-weight: 600;
  padding: .15em .55em;
  border-radius: 4px;
  letter-spacing: .04em;
}
.tag-fix    { background: #0d2137; color: #58a6ff; }
.tag-feat   { background: #0d2a1e; color: #3fb950; }
.tag-method { background: #1f1535; color: #bc8cff; }

/* ── Install ─────────────────────────────────────────────────────────── */
.install-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  align-items: start;
}
@media (max-width: 768px) { .install-grid { grid-template-columns: 1fr; } }
.install-step { margin-bottom: 1rem; }
.install-step-label {
  font-size: .72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--muted);
  margin-bottom: .4rem;
}

/* ── Footer ──────────────────────────────────────────────────────────── */
footer {
  background: #0d1117;
  color: #6e7681;
  padding: 2.5rem 0;
  font-size: .82rem;
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}
footer a { color: #8b949e; }
footer a:hover { color: #e6edf3; }

/* ── Comparison table ────────────────────────────────────────────────── */
.compare-table-wrap { overflow-x: auto; }
.compare-table {
  width: 100%;
  border-collapse: collapse;
  font-size: .85rem;
}
.compare-table th, .compare-table td {
  padding: .6rem .9rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}
.compare-table th { background: var(--code-bg); font-weight: 700; font-size: .78rem; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); }
.compare-table tbody tr:hover td { background: #f9fafb; }
.compare-table td:first-child { font-weight: 700; }

/* ── Responsive ──────────────────────────────────────────────────────── */
@media (max-width: 640px) {
  .nav-links { display: none; }
  .hero-stats { gap: 1.5rem; }
  .theories-grid { grid-template-columns: 1fr; }
}