/* InVal Risk — site styles
   Palette: ink, paper, slate + one color per module.
   Type: Bricolage Grotesque (display), IBM Plex Sans (text). */

:root {
  --ink: #0f1e2e;
  --paper: #eef0f2;
  --paper-deep: #e3e6ea;
  --slate: #5a6875;
  --rule: #c9ced4;
  --white: #ffffff;

  --momentum: #1c7f67;
  --rmis: #2353b8;
  --mastery: #b9671a;

  --font-display: "Bricolage Grotesque", "Helvetica Neue", Arial, sans-serif;
  --font-text: "IBM Plex Sans", "Segoe UI", Roboto, sans-serif;

  --measure: 62ch;
  --gutter: 16px;
  --spine-x: 28px;
  --radius: 2px;
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-text);
  font-size: 1.0625rem;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }
a:focus-visible, button:focus-visible {
  outline: 3px solid var(--ink);
  outline-offset: 3px;
}

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.015em;
  line-height: 1.08;
  margin: 0;
}
h1 { font-size: clamp(2.5rem, 6.2vw, 4.75rem); }
h2 { font-size: clamp(1.75rem, 3.4vw, 2.5rem); }
h3 { font-size: 1.375rem; line-height: 1.2; }

p { margin: 0; max-width: var(--measure); }
p + p { margin-top: 1em; }

.wrap {
  width: min(1180px, 100% - 2 * var(--gutter));
  margin-inline: auto;
}

/* ---------- Header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--rule);
}
.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 64px;
}
.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.25rem;
  letter-spacing: -0.01em;
}
.logo svg { width: 26px; height: 26px; display: block; }

.site-nav { display: flex; gap: 4px; }
.site-nav a {
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  padding: 8px 12px;
  border-radius: var(--radius);
  color: var(--slate);
  border-bottom: 2px solid transparent;
}
.site-nav a:hover { color: var(--ink); }
.site-nav a[aria-current="page"] { color: var(--ink); }
.site-nav a[data-module="momentum"][aria-current="page"] { border-bottom-color: var(--momentum); }
.site-nav a[data-module="rmis"][aria-current="page"] { border-bottom-color: var(--rmis); }
.site-nav a[data-module="mastery"][aria-current="page"] { border-bottom-color: var(--mastery); }

/* ---------- Hero ---------- */

.hero { padding: clamp(56px, 9vw, 120px) 0 clamp(40px, 6vw, 80px); }
.hero .wrap {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  gap: clamp(32px, 6vw, 96px);
  align-items: center;
}
.hero-copy p {
  margin-top: 24px;
  font-size: 1.2rem;
  color: var(--slate);
  max-width: 48ch;
}
.hero-figure { justify-self: end; width: 100%; max-width: 460px; }
.hero-figure svg { width: 100%; height: auto; display: block; }
.diagram[data-highlight="momentum"] .block:not(.momentum),
.diagram[data-highlight="rmis"] .block:not(.rmis),
.diagram[data-highlight="mastery"] .block:not(.mastery) { opacity: 0.2; }
.diagram[data-highlight="momentum"] .label:not(.momentum),
.diagram[data-highlight="rmis"] .label:not(.rmis),
.diagram[data-highlight="mastery"] .label:not(.mastery) { opacity: 0; }

/* Module hero variant */
.hero.module .hero-copy .kicker {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.1rem;
  margin: 0 0 14px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
}
.hero.module .kicker::before {
  content: "";
  width: 14px; height: 14px;
  background: var(--module);
  border-radius: var(--radius);
}
.status {
  display: inline-block;
  margin-top: 20px;
  padding: 6px 10px;
  font-size: 0.9rem;
  font-weight: 500;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--white);
  color: var(--slate);
}

/* ---------- Sections ---------- */

.section { padding: clamp(48px, 7vw, 96px) 0; }
.section + .section { border-top: 1px solid var(--rule); }
.section-head { margin-bottom: clamp(28px, 4vw, 48px); }
.section-head p {
  margin-top: 14px;
  color: var(--slate);
  font-size: 1.1rem;
}

/* The spine ledger: rows hanging off a vertical rule */
.ledger {
  position: relative;
  padding-left: var(--spine-x);
  list-style: none;
  margin: 0;
}
.ledger::before {
  content: "";
  position: absolute;
  left: 6px; top: 0; bottom: 0;
  width: 2px;
  background: var(--ink);
}
.ledger > li {
  position: relative;
  padding: 26px 0 30px;
  border-top: 1px solid var(--rule);
  display: grid;
  grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
  gap: 16px 40px;
  align-items: start;
}
.ledger > li:last-child { border-bottom: 1px solid var(--rule); }
.ledger > li::before {
  content: "";
  position: absolute;
  left: calc(-1 * var(--spine-x));
  top: 30px;
  width: 14px; height: 14px;
  background: var(--module, var(--ink));
  border-radius: var(--radius);
}
.ledger h3 a { text-decoration: none; }
.ledger h3 a:hover { text-decoration: underline; text-underline-offset: 4px; }
.ledger .tag {
  display: block;
  margin-top: 6px;
  font-size: 0.95rem;
  color: var(--slate);
}
.ledger p { color: var(--ink); }
.ledger .more {
  display: inline-block;
  margin-top: 14px;
  font-weight: 500;
  font-size: 0.95rem;
  text-decoration-thickness: 1.5px;
  text-underline-offset: 4px;
}

/* Plain two-column point list (no spine) */
.points {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 40px;
}
.points li { border-top: 2px solid var(--ink); padding-top: 18px; }
.points h3 { margin-bottom: 10px; }
.points p { color: var(--slate); font-size: 1rem; }

/* Feature list on module pages */
.features {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 32px 48px;
}
.features li {
  padding-left: 22px;
  border-left: 3px solid var(--module, var(--ink));
}
.features h3 { font-size: 1.2rem; margin-bottom: 8px; }
.features p { color: var(--slate); font-size: 1rem; }

/* Dark band */
.band {
  background: var(--ink);
  color: var(--paper);
  padding: clamp(48px, 7vw, 96px) 0;
}
.band .wrap {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: clamp(32px, 6vw, 96px);
  align-items: start;
}
.band p { color: color-mix(in srgb, var(--paper) 78%, var(--ink)); }
.band .points li { border-top-color: var(--paper); }
.band .points h3 { color: var(--paper); }
.band .points { grid-template-columns: 1fr; gap: 28px; }

/* Standalone / together */
.pair {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
  border: 1px solid var(--rule);
  background: var(--white);
}
.pair > div { padding: clamp(24px, 3vw, 40px); }
.pair > div + div { border-left: 1px solid var(--rule); }
.pair h3 { margin-bottom: 10px; }
.pair p { color: var(--slate); font-size: 1rem; }

/* In-development notice */
.notice {
  border: 1px solid var(--rule);
  background: var(--white);
  padding: clamp(24px, 3vw, 40px);
  max-width: 72ch;
}
.notice p { color: var(--slate); }
.notice p:first-child { color: var(--ink); font-weight: 500; }

/* Next-module links */
.siblings {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}
.siblings a {
  display: block;
  text-decoration: none;
  padding: 24px;
  border: 1px solid var(--rule);
  background: var(--white);
  border-left: 6px solid var(--module);
}
.siblings a:hover { border-color: var(--ink); border-left-color: var(--module); }
.siblings h3 { font-size: 1.2rem; margin-bottom: 4px; }
.siblings span { color: var(--slate); font-size: 0.95rem; }

/* ---------- Footer ---------- */

.site-footer {
  border-top: 1px solid var(--rule);
  padding: 32px 0 40px;
  color: var(--slate);
  font-size: 0.9rem;
}
.site-footer .wrap {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px 24px;
}
.site-footer nav { display: flex; gap: 20px; }
.site-footer a { text-decoration: none; }
.site-footer a:hover { text-decoration: underline; }

/* ---------- Responsive ---------- */

@media (max-width: 880px) {
  .hero .wrap { grid-template-columns: 1fr; }
  .hero-figure { justify-self: start; max-width: 340px; }
  .band .wrap { grid-template-columns: 1fr; }
  .points { grid-template-columns: 1fr; gap: 28px; }
  .features { grid-template-columns: 1fr; gap: 24px; }
  .pair { grid-template-columns: 1fr; }
  .pair > div + div { border-left: 0; border-top: 1px solid var(--rule); }
  .ledger > li { grid-template-columns: 1fr; gap: 10px; }
  .siblings { grid-template-columns: 1fr; }
}

@media (max-width: 560px) {
  .site-header .wrap { min-height: 56px; }
  .site-nav a { padding: 8px 7px; font-size: 0.88rem; }
  .logo { font-size: 1.1rem; }
  body { font-size: 1rem; }
}