/* -----------------------------------------------------------
   TriadicFrameworks — Theory Page Layout System
   Shared across all Ten‑in‑1 theory modules
----------------------------------------------------------- */

:root {
  --tf-font-main: 'Inter', system-ui, sans-serif;
  --tf-font-mono: ui-monospace, SFMono-Regular, Menlo, monospace;

  --tf-fg: #f5f5f7;
  --tf-muted: #9ca3af;
  --tf-bg: #040509;

  --tf-radius-lg: 18px;
  --tf-radius-md: 10px;
  --tf-radius-pill: 999px;

  --tf-shadow-soft: 0 18px 45px rgba(0,0,0,0.55);
  --tf-shadow-subtle: 0 0 0 1px rgba(255,255,255,0.02);
}

body.tf-module--theory {
  margin: 0;
  padding: 0;
  font-family: var(--tf-font-main);
  color: var(--tf-fg);
  background: var(--tf-bg);
  -webkit-font-smoothing: antialiased;
}

/* -----------------------------------------------------------
   HERO
----------------------------------------------------------- */

.tf-hero {
  padding: 60px 20px 40px;
  text-align: left;
  max-width: 1080px;
  margin: 0 auto;
}

.tf-hero__content h1 {
  margin: 0;
  font-size: 42px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.tf-hero__content h2 {
  margin: 6px 0 14px;
  font-size: 20px;
  font-weight: 400;
  color: var(--tf-muted);
}

.tf-hero__summary {
  max-width: 620px;
  font-size: 16px;
  line-height: 1.55;
  margin-bottom: 22px;
}

/* -----------------------------------------------------------
   BUTTONS
----------------------------------------------------------- */

.tf-button {
  display: inline-block;
  padding: 10px 18px;
  border-radius: var(--tf-radius-pill);
  font-size: 14px;
  text-decoration: none;
  transition: 0.2s ease;
}

.tf-button--primary {
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.25);
  color: var(--tf-fg);
}

.tf-button--primary:hover {
  background: rgba(255,255,255,0.18);
}

.tf-button--ghost {
  border: 1px solid rgba(255,255,255,0.25);
  color: var(--tf-muted);
}

.tf-button--ghost:hover {
  color: var(--tf-fg);
  border-color: rgba(255,255,255,0.4);
}

/* -----------------------------------------------------------
   MAIN + SECTIONS
----------------------------------------------------------- */

.tf-main {
  max-width: 1080px;
  margin: 0 auto;
  padding: 20px;
}

.tf-section {
  margin-bottom: 48px;
}

.tf-section h2 {
  margin: 0 0 14px;
  font-size: 22px;
  letter-spacing: 0.03em;
}

/* -----------------------------------------------------------
   LISTS
----------------------------------------------------------- */

.tf-list {
  padding-left: 18px;
  margin: 0 0 12px;
  line-height: 1.55;
}

.tf-list--numbered {
  list-style: decimal;
}

.tf-list a {
  color: #e0f2fe;
  text-decoration: none;
  border-bottom: 1px dashed rgba(148,163,184,0.6);
}

.tf-list a:hover {
  border-bottom-style: solid;
}

/* -----------------------------------------------------------
   CODE
----------------------------------------------------------- */

code {
  font-family: var(--tf-font-mono);
  font-size: 13px;
  background: rgba(255,255,255,0.08);
  padding: 2px 6px;
  border-radius: 6px;
}

/* -----------------------------------------------------------
   FOOTER
----------------------------------------------------------- */

footer {
  padding: 20px;
  font-size: 12px;
  color: var(--tf-muted);
  text-align: center;
  opacity: 0.8;
}