/* ============================================================
   THE INTEREST ALLIANCE — Design System v2
   ------------------------------------------------------------
   01  Variables
   02  Typography
   03  Buttons
   04  Navigation
   05  Hero
   06  Sections
   07  Cards
   08  Tables
   09  Footer
   10  Utilities
   11  Responsive
   ============================================================ */

/* 01 — Variables
   ============================================================ */
:root {
  /* Color */
  --c-navy:        #081B3A;
  --c-navy-mid:    #0A2248;
  --c-navy-soft:   #102C57;
  --c-gold:        #C6A76A;
  --c-gold-text:   #A3854A;
  --c-bg:          #FFFFFF;
  --c-bg-alt:      #F7F8FA;
  --c-charcoal:    #23282F;
  --c-slate:       #5B6472;
  --c-slate-inv:   #8FA0B8;
  --c-border:      #E5E8ED;
  --c-border-inv:  #1D3560;

  /* Typography */
  --f-display: "Manrope", "Inter", -apple-system, "Segoe UI", sans-serif;
  --f-body:    "Inter", -apple-system, "Segoe UI", Helvetica, sans-serif;

  --fs-hero:  clamp(2.75rem, 6vw, 4.5rem);    /* 44–72 */
  --fs-h1:    clamp(2.375rem, 5vw, 3.5rem);   /* 38–56 */
  --fs-h2:    clamp(1.75rem, 3.2vw, 2.5rem);  /* 28–40 */
  --fs-h3:    1.375rem;                       /* 22    */
  --fs-lede:  1.3125rem;                      /* 21    */
  --fs-body:  1.0625rem;                      /* 17    */
  --fs-small: 0.9375rem;                      /* 15    */
  --fs-label: 0.75rem;                        /* 12    */

  /* Spacing scale */
  --s-1: 0.5rem;
  --s-2: 1rem;
  --s-3: 1.75rem;
  --s-4: 3rem;
  --s-5: 5rem;
  --s-6: 8.75rem;   /* section rhythm */

  /* Layout */
  --w-max:     75rem;   /* 1200 */
  --w-text:    42rem;   /* ~65ch */
  --w-lede:    36rem;

  /* Misc */
  --radius:  4px;
  --shadow:  0 20px 50px rgba(8, 27, 58, 0.10);
  --ease:    200ms cubic-bezier(0.33, 1, 0.68, 1);
}

/* 02 — Typography
   ============================================================ */
*,
*::before,
*::after { box-sizing: border-box; margin: 0; padding: 0; }

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

body {
  font-family: var(--f-body);
  font-size: var(--fs-body);
  font-weight: 400;
  line-height: 1.75;
  color: var(--c-charcoal);
  background: var(--c-bg);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
  font-family: var(--f-display);
  font-weight: 700;
  color: var(--c-navy);
  letter-spacing: -0.022em;
  line-height: 1.12;
}

h1 { font-size: var(--fs-h1); max-width: 20ch; }
h2 { font-size: var(--fs-h2); max-width: 24ch; line-height: 1.18; }
h3 { font-size: var(--fs-h3); line-height: 1.35; letter-spacing: -0.01em; }

p { max-width: var(--w-text); }

.lede {
  font-size: var(--fs-lede);
  line-height: 1.6;
  font-weight: 400;
  color: var(--c-slate);
  max-width: var(--w-lede);
}

.label {
  display: block;
  font-size: var(--fs-label);
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--c-gold-text);
  margin-bottom: var(--s-3);
}

img, svg { display: block; max-width: 100%; }

/* 03 — Buttons
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  font-family: var(--f-display);
  font-size: var(--fs-small);
  font-weight: 700;
  letter-spacing: 0.02em;
  text-decoration: none;
  border-radius: var(--radius);
  padding: 1rem 2rem;
  transition: background var(--ease), color var(--ease), border-color var(--ease);
}

.btn::after { content: "→"; font-weight: 400; transition: transform var(--ease); }
.btn:hover::after { transform: translateX(4px); }

.btn-solid { background: var(--c-navy); color: #fff; border: 1px solid var(--c-navy); }
.btn-solid:hover { background: var(--c-navy-soft); border-color: var(--c-navy-soft); }

.btn-gold { background: var(--c-gold); color: var(--c-navy); border: 1px solid var(--c-gold); }
.btn-gold:hover { background: #D4B87E; border-color: #D4B87E; }

.btn-outline { background: transparent; color: #fff; border: 1px solid rgba(255,255,255,0.4); }
.btn-outline:hover { border-color: var(--c-gold); color: var(--c-gold); }

.link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--f-display);
  font-size: var(--fs-small);
  font-weight: 700;
  color: var(--c-navy);
  text-decoration: none;
  border-bottom: 2px solid var(--c-gold);
  padding-bottom: 0.25rem;
  transition: color var(--ease);
}
.link::after { content: "→"; font-weight: 400; transition: transform var(--ease); }
.link:hover { color: var(--c-gold-text); }
.link:hover::after { transform: translateX(4px); }

/* 04 — Navigation
   ============================================================ */
.nav {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--c-border);
}

.nav-inner {
  max-width: var(--w-max);
  margin-inline: auto;
  padding: 0 var(--s-3);
  min-height: 5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-3);
}

.nav-logo { flex: none; }
.nav-logo img { height: 2.375rem; width: auto; }

.nav-menu { display: flex; align-items: center; gap: 2.5rem; list-style: none; }

.nav-menu a {
  font-family: var(--f-display);
  font-size: var(--fs-small);
  font-weight: 600;
  color: var(--c-slate);
  text-decoration: none;
  padding: 0.5rem 0;
  position: relative;
  transition: color var(--ease);
}

.nav-menu a::after {
  content: "";
  position: absolute;
  left: 0; right: 100%;
  bottom: 0;
  height: 2px;
  background: var(--c-gold);
  transition: right var(--ease);
}

.nav-menu a:hover { color: var(--c-navy); }
.nav-menu a:hover::after,
.nav-menu a[aria-current="page"]::after { right: 0; }
.nav-menu a[aria-current="page"] { color: var(--c-navy); }

.nav-cta { margin-left: 0.5rem; }
.nav-cta .btn { padding: 0.75rem 1.5rem; }

/* Mobile toggle */
.nav-check { position: absolute; opacity: 0; pointer-events: none; }
.nav-burger {
  display: none;
  width: 2.75rem;
  height: 2.75rem;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
}
.nav-burger span,
.nav-burger span::before,
.nav-burger span::after {
  content: "";
  display: block;
  width: 1.25rem;
  height: 2px;
  background: var(--c-navy);
  position: relative;
  transition: transform var(--ease), background var(--ease);
}
.nav-burger span::before { position: absolute; top: -6px; }
.nav-burger span::after  { position: absolute; top: 6px; }

/* 05 — Hero
   ============================================================ */
.hero {
  background:
    radial-gradient(1200px 500px at 85% -10%, rgba(198, 167, 106, 0.14), transparent 60%),
    linear-gradient(170deg, var(--c-navy-mid) 0%, var(--c-navy) 65%);
  color: #fff;
  padding: var(--s-6) 0;
}

.hero-inner {
  max-width: var(--w-max);
  margin-inline: auto;
  padding: 0 var(--s-3);
}

.hero .label { color: var(--c-gold); margin-bottom: var(--s-2); }

.hero h1 {
  color: #fff;
  font-size: var(--fs-hero);
  max-width: 17ch;
}

.hero .lede {
  color: var(--c-slate-inv);
  margin-top: var(--s-3);
}

.hero-actions { display: flex; flex-wrap: wrap; gap: var(--s-2); margin-top: var(--s-4); }

.hero-page { padding: var(--s-5) 0 var(--s-5); }
.hero-page h1 { font-size: var(--fs-h1); }

/* Hero stat strip */
.hero-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--s-3);
  margin-top: var(--s-6);
  padding-top: var(--s-4);
  border-top: 1px solid var(--c-border-inv);
}

.strip-item .strip-k {
  font-family: var(--f-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: #fff;
}
.strip-item .strip-k em { font-style: normal; color: var(--c-gold); }
.strip-item .strip-v {
  font-size: var(--fs-small);
  color: var(--c-slate-inv);
  margin-top: 0.375rem;
  max-width: 30ch;
}

/* 06 — Sections
   ============================================================ */
.section { padding: var(--s-6) 0; }
.section-alt { background: var(--c-bg-alt); }
.section-navy { background: var(--c-navy); color: #fff; }
.section-navy h2 { color: #fff; }
.section-navy .lede { color: var(--c-slate-inv); }

.container {
  max-width: var(--w-max);
  margin-inline: auto;
  padding: 0 var(--s-3);
}

.section-head { margin-bottom: var(--s-5); }
.section-head .lede { margin-top: var(--s-2); }

.divider {
  border: 0;
  height: 1px;
  background: var(--c-border);
  max-width: var(--w-max);
  margin: 0 auto;
}

.prose > * + * { margin-top: var(--s-3); }
.prose h2 { margin-top: var(--s-5); }
.prose h3 { margin-top: var(--s-4); }
.prose a { color: var(--c-navy); font-weight: 500; text-decoration: none; border-bottom: 1px solid var(--c-gold); transition: color var(--ease); }
.prose a:hover { color: var(--c-gold-text); }

.callout {
  background: var(--c-bg-alt);
  border-left: 3px solid var(--c-gold);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: var(--s-3) var(--s-4);
  max-width: 46rem;
}
.callout p {
  font-family: var(--f-display);
  font-size: 1.3125rem;
  font-weight: 600;
  line-height: 1.5;
  color: var(--c-navy);
  letter-spacing: -0.01em;
}
.section-alt .callout,
.section-navy .callout { background: var(--c-bg); }

/* Split layout (label rail + content) */
.split {
  display: grid;
  grid-template-columns: 16rem 1fr;
  gap: var(--s-5);
  align-items: start;
}
.split-rail { position: sticky; top: 7rem; }
.split-rail .label { margin-bottom: var(--s-2); }
.split-rail h2 { font-size: var(--fs-h2); }

/* CTA band */
.cta {
  background:
    radial-gradient(900px 400px at 15% 120%, rgba(198, 167, 106, 0.16), transparent 60%),
    var(--c-navy);
  color: #fff;
  padding: var(--s-6) 0;
}
.cta h2 { color: #fff; max-width: 20ch; }
.cta .lede { color: var(--c-slate-inv); margin-top: var(--s-2); }
.cta-actions { margin-top: var(--s-4); display: flex; flex-wrap: wrap; gap: var(--s-2); }

/* 07 — Cards
   ============================================================ */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--s-3); }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--s-3); }

.card {
  background: var(--c-bg);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: var(--s-4) var(--s-3);
  display: flex;
  flex-direction: column;
  gap: var(--s-2);
  transition: transform var(--ease), box-shadow var(--ease), border-color var(--ease);
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow);
  border-color: rgba(8, 27, 58, 0.35);
}

.card-index {
  font-family: var(--f-display);
  font-size: var(--fs-label);
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-gold-text);
}

.card p { font-size: var(--fs-small); line-height: 1.7; color: var(--c-slate); }
.card .link { margin-top: auto; align-self: flex-start; }

/* Dark cards (navy sections) */
.card-dark {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--c-border-inv);
  border-radius: var(--radius);
  padding: var(--s-4) var(--s-3);
}
.card-dark h3 { color: #fff; }
.card-dark p { font-size: var(--fs-small); color: var(--c-slate-inv); line-height: 1.7; margin-top: var(--s-1); }
.card-dark .card-index { color: var(--c-gold); }

/* 08 — Tables (definition rows, contact details)
   ============================================================ */
.rows { border-top: 1px solid var(--c-border); }

.row {
  display: grid;
  grid-template-columns: 10rem 1fr;
  gap: var(--s-3);
  padding: 1.125rem 0;
  border-bottom: 1px solid var(--c-border);
}

.row dt {
  font-size: var(--fs-label);
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-slate);
  padding-top: 0.25rem;
}

.row dd { font-size: var(--fs-body); color: var(--c-charcoal); }
.row dd a { color: var(--c-navy); font-weight: 500; text-decoration: none; border-bottom: 1px solid var(--c-gold); }
.row dd a:hover { color: var(--c-gold-text); }

/* 09 — Footer
   ============================================================ */
.footer {
  background: var(--c-navy);
  color: var(--c-slate-inv);
  padding: var(--s-6) 0 var(--s-4);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: var(--s-5);
  padding-bottom: var(--s-5);
  border-bottom: 1px solid var(--c-border-inv);
}

.footer-brand img { height: 2.5rem; width: auto; margin-bottom: var(--s-3); }
.footer-brand p { font-size: var(--fs-small); line-height: 1.7; max-width: 34ch; }

.footer-col-title {
  font-family: var(--f-display);
  font-size: var(--fs-label);
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: #fff;
  margin-bottom: var(--s-3);
}

.footer-links { list-style: none; }
.footer-links li + li { margin-top: 0.875rem; }
.footer-links a {
  font-size: var(--fs-small);
  color: var(--c-slate-inv);
  text-decoration: none;
  transition: color var(--ease);
}
.footer-links a:hover { color: var(--c-gold); }

.footer-meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--s-2);
  padding-top: var(--s-3);
  font-size: 0.8125rem;
}

/* 10 — Utilities
   ============================================================ */
.skip {
  position: absolute;
  left: -999px;
  z-index: 60;
  background: var(--c-navy);
  color: #fff;
  padding: 0.875rem 1.5rem;
}
.skip:focus { left: 0; top: 0; }

:focus-visible { outline: 2px solid var(--c-gold); outline-offset: 3px; }

.mt-2 { margin-top: var(--s-2); }
.mt-3 { margin-top: var(--s-3); }
.mt-4 { margin-top: var(--s-4); }
.measure { max-width: var(--w-text); }

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

/* 11 — Responsive
   ============================================================ */
@media (max-width: 64rem) {
  :root { --s-6: 6rem; }
  .grid-3 { grid-template-columns: 1fr 1fr; }
  .split { grid-template-columns: 1fr; gap: var(--s-4); }
  .split-rail { position: static; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 44rem) {
  :root { --s-6: 4.5rem; --s-5: 3.5rem; }

  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .hero-strip { grid-template-columns: 1fr; gap: var(--s-3); }
  .footer-grid { grid-template-columns: 1fr; gap: var(--s-4); }
  .row { grid-template-columns: 1fr; gap: 0.25rem; }

  .nav-burger { display: flex; }
  .nav-cta { display: none; }

  .nav-menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--c-bg);
    border-bottom: 1px solid var(--c-border);
    padding: var(--s-2) var(--s-3) var(--s-3);
    display: none;
  }
  .nav-menu a { display: block; padding: 0.875rem 0; font-size: 1rem; }

  .nav-check:checked ~ .nav-menu { display: flex; }
  .nav-check:checked ~ .nav-burger span { background: transparent; }
  .nav-check:checked ~ .nav-burger span::before { top: 0; transform: rotate(45deg); }
  .nav-check:checked ~ .nav-burger span::after  { top: 0; transform: rotate(-45deg); }

  .btn { width: 100%; justify-content: center; }
  .hero-actions .btn, .cta-actions .btn { width: 100%; }
}