/* Big Rank Theory — editorial static site */

:root {
  --ink: #10131a;
  --ink-soft: #454b57;
  --paper: #f8f4ea;      /* cream off-white */
  --paper-warm: #efe9d9; /* deeper cream */
  --line: #ddd5c1;
  --accent: #0a46ff;     /* brand blue */
  --accent-dark: #0836c8;
  --maxw: 1140px;
  --pad: clamp(1.25rem, 5vw, 4rem);
  --serif: "Fraunces", Georgia, "Times New Roman", serif;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

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

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }

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

h1, h2, h3 {
  font-family: var(--serif);
  font-weight: 460;
  font-optical-sizing: auto;
  line-height: 1.1;
  letter-spacing: -0.015em;
  margin: 0 0 0.5em;
}
h1 { font-size: clamp(2.5rem, 6.2vw, 4.25rem); }
h2 { font-size: clamp(1.85rem, 4vw, 2.85rem); }
h3 { font-size: clamp(1.3rem, 2.5vw, 1.65rem); }
p { margin: 0 0 1.2em; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding-inline: var(--pad); }
.lead { font-size: clamp(1.15rem, 2vw, 1.4rem); color: var(--ink-soft); line-height: 1.55; max-width: 46ch; }
.eyebrow { font-family: var(--sans); font-size: 0.76rem; font-weight: 600; letter-spacing: 0.18em; text-transform: uppercase; color: var(--accent); margin: 0 0 1.25rem; }

/* Buttons */
.btn {
  display: inline-block;
  font-family: var(--sans);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  padding: 0.9rem 1.6rem;
  background: var(--accent);
  color: #fff;
  border: 1px solid var(--accent);
  transition: background .2s, color .2s, border-color .2s;
}
.btn:hover { background: var(--accent-dark); border-color: var(--accent-dark); color: #fff; }
.btn--ghost { background: transparent; color: var(--ink); border-color: var(--ink); }
.btn--ghost:hover { background: var(--ink); color: var(--paper); }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(248,244,234,0.9);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--line);
}
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; padding-block: 0.9rem; }
.brand { display: flex; align-items: center; gap: 0.6rem; font-family: var(--serif); font-size: 1.15rem; font-weight: 500; color: var(--ink); letter-spacing: -0.01em; }
.brand-mark { width: 30px; height: 30px; border-radius: 8px; }
.brand span { color: var(--accent); }
.nav { display: flex; gap: 1.9rem; align-items: center; font-family: var(--sans); font-size: 0.92rem; }
.nav a { color: var(--ink-soft); font-weight: 500; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--ink); }
.nav .btn { color: #fff; }
.nav-toggle { display: none; background: none; border: 0; font-size: 1.5rem; color: var(--ink); cursor: pointer; }

@media (max-width: 760px) {
  .nav-toggle { display: block; }
  .nav {
    position: absolute; top: 100%; left: 0; right: 0;
    flex-direction: column; align-items: flex-start; gap: 1.1rem;
    background: var(--paper); border-bottom: 1px solid var(--line);
    padding: 1.5rem var(--pad); display: none;
  }
  .nav.open { display: flex; }
}

/* Sections */
section { padding-block: clamp(3.5rem, 9vw, 7rem); }
.section-tight { padding-block: clamp(2.5rem, 6vw, 4.5rem); }
.divider { border: 0; border-top: 1px solid var(--line); margin: 0; }
.bg-warm { background: var(--paper-warm); }
.bg-ink { background: var(--ink); color: var(--paper); }
.bg-ink h1, .bg-ink h2, .bg-ink h3 { color: var(--paper); }
.bg-ink .eyebrow { color: #7fa0ff; }
.bg-ink a:not(.btn) { color: #a9c0ff; }
.bg-blue { background: var(--accent); color: #fff; }
.bg-blue h1, .bg-blue h2, .bg-blue h3 { color: #fff; }
.bg-blue .eyebrow { color: #cddaff; }
.bg-blue .lead { color: #e6ecff; }
.bg-blue a:not(.btn) { color: #fff; text-decoration: underline; }

/* Hero */
.hero { padding-block: clamp(4.5rem, 12vw, 9rem); }
.hero h1 { max-width: 16ch; }
.hero .lead { margin-top: 1.5rem; max-width: 60ch; }
.hero .btn { margin-top: 2.5rem; }

/* Grid of services */
.grid { display: grid; gap: 1px; background: var(--line); border: 1px solid var(--line); }
@media (min-width: 720px) { .grid--2 { grid-template-columns: 1fr 1fr; } }
.card { background: var(--paper); padding: clamp(1.75rem, 4vw, 2.75rem); }
.card h3 { margin-bottom: 0.35em; }
.card .sub { font-family: var(--serif); font-size: 1.1rem; color: var(--ink); margin-bottom: 0.8em; display: block; }
.card p { color: var(--ink-soft); }
.card .more { font-family: var(--sans); font-size: 0.82rem; font-weight: 600; letter-spacing: 0.05em; text-transform: uppercase; }

/* Service detail blocks */
.service { display: grid; gap: 2rem; padding-block: clamp(3rem, 7vw, 5rem); }
@media (min-width: 860px) { .service { grid-template-columns: 1fr 1.1fr; gap: 4rem; } }
.service + .service { border-top: 1px solid var(--line); }
.service h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); }
.service .sub { font-family: var(--serif); font-size: 1.2rem; color: var(--ink-soft); margin-bottom: 1em; }
.tags { list-style: none; margin: 1.5rem 0 0; padding: 0; display: flex; flex-wrap: wrap; gap: 0.5rem; }
.tags li { font-family: var(--sans); font-size: 0.82rem; color: var(--ink-soft); background: var(--paper-warm); border: 1px solid var(--line); padding: 0.35rem 0.7rem; }
.result { margin-top: 1.5rem; font-style: italic; font-family: var(--serif); font-size: 1.1rem; color: var(--ink); }

/* Refrain / list section */
.refrain { columns: 2; column-gap: 3rem; max-width: 640px; font-family: var(--serif); font-size: 1.35rem; line-height: 1.9; }
.refrain p { margin: 0; break-inside: avoid; }
@media (max-width: 620px) { .refrain { columns: 1; } }

/* Contact */
.contact-cta { text-align: center; }
.contact-cta h2 { max-width: 20ch; margin-inline: auto; }
.contact-cta .lead { margin-inline: auto; text-align: center; }

/* Footer */
.site-footer { background: var(--ink); color: var(--paper-warm); font-family: var(--sans); font-size: 0.9rem; }
.site-footer .wrap { padding-block: 3.5rem; display: flex; flex-wrap: wrap; gap: 2rem; justify-content: space-between; }
.site-footer a { color: var(--paper-warm); }
.site-footer a:hover { color: #fff; }
.site-footer .brand { color: #fff; margin-bottom: 0.6rem; }
.site-footer .brand span { color: #7fa0ff; }
.site-footer nav { display: flex; gap: 1.4rem; flex-wrap: wrap; }
.site-footer .fine { width: 100%; border-top: 1px solid #2a2f3a; padding-top: 1.5rem; color: #7f8592; }

/* Utility */
.stack > * + * { margin-top: 1.5rem; }
.center { text-align: center; }
.mt-0 { margin-top: 0; }