/* ==========================================================================
   BTN Consulting — auction advisory
   Palette: black #000, white #FFF, greys for hierarchy only
   Type:    Instrument Serif (display) + Hanken Grotesk (text)
   ========================================================================== */

:root {
  --black: #000000;
  --white: #FFFFFF;
  --grey-700: #3F3F3F;
  --grey-500: #6B6B6B;
  --grey-200: #E3E3E3;
  --grey-100: #F5F5F5;

  --serif: "Instrument Serif", "Times New Roman", serif;
  --sans: "Hanken Grotesk", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  --width: 1120px;
  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.6;
  color: var(--black);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; }
ul { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, p { margin: 0; }

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

.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--black); color: var(--white);
  padding: 12px 18px; z-index: 100;
}
.skip-link:focus { left: 0; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-delay: 0s !important;
    transition-duration: 0.01ms !important;
  }
}

/* ---------- Layout ---------- */
.wrap { max-width: var(--width); margin: 0 auto; padding: 0 28px; }
.section { padding: 112px 0; }
.section + .section { border-top: 1px solid var(--grey-200); }
.section--tight { padding: 72px 0; }

/* ---------- Type ---------- */
.display {
  font-family: var(--serif);
  font-weight: 400;
  line-height: 1.02;
  letter-spacing: -0.015em;
}
h1.display { font-size: clamp(3rem, 7.2vw, 5.8rem); }
h2.display { font-size: clamp(2.2rem, 4.4vw, 3.5rem); }
h3.display { font-size: 1.9rem; line-height: 1.1; }
.lede { font-size: 1.25rem; color: var(--grey-700); max-width: 34em; line-height: 1.55; }
.muted { color: var(--grey-500); }
.prose p + p { margin-top: 1.1em; }
.prose { max-width: 38em; color: var(--grey-700); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  padding: 14px 28px;
  border: 1px solid var(--black);
  background: var(--black);
  color: var(--white);
  font: 600 0.98rem var(--sans);
  text-decoration: none;
  cursor: pointer;
  transition: background 0.2s var(--ease), color 0.2s var(--ease);
}
.btn:hover { background: var(--white); color: var(--black); }
.btn--ghost { background: transparent; color: var(--black); }
.btn--ghost:hover { background: var(--black); color: var(--white); }
.btn--invert { background: var(--white); color: var(--black); border-color: var(--white); }
.btn--invert:hover { background: transparent; color: var(--white); }
.btn-row { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 36px; }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--grey-200);
}
.nav { display: flex; align-items: center; justify-content: space-between; height: 72px; }
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; }
.brand svg { width: 30px; height: 30px; }
.brand span { font: 400 1.5rem var(--serif); letter-spacing: -0.01em; }
.nav-links { display: flex; align-items: center; gap: 34px; }
.nav-links a { text-decoration: none; font-size: 0.97rem; font-weight: 500; color: var(--grey-500); }
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--black); }
.nav-links a[aria-current="page"] { text-decoration: underline; text-underline-offset: 8px; text-decoration-thickness: 1.5px; }
.nav-links .btn { color: var(--white); padding: 10px 20px; }
.nav-links .btn:hover { color: var(--black); }
.nav-toggle { display: none; background: none; border: 0; padding: 8px; cursor: pointer; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--black); margin: 5px 0; transition: transform 0.2s var(--ease), opacity 0.2s; }
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 800px) {
  .nav-toggle { display: block; }
  .nav-links {
    position: fixed; inset: 72px 0 0 0; background: var(--white);
    flex-direction: column; align-items: flex-start; gap: 0;
    padding: 24px 28px; opacity: 0; pointer-events: none;
    transition: opacity 0.2s var(--ease);
  }
  .nav-links.open { opacity: 1; pointer-events: auto; }
  .nav-links a { width: 100%; padding: 16px 0; border-bottom: 1px solid var(--grey-200); font-size: 1.15rem; }
  .nav-links .btn { margin-top: 24px; text-align: center; border-bottom: 1px solid var(--black); }
}

/* ---------- Hero ---------- */
.hero { padding: 96px 0 104px; }
.hero-grid { display: grid; grid-template-columns: 1.25fr 0.75fr; gap: 72px; align-items: center; }
.hero .lede { margin-top: 28px; }

/* Bid ledger: the one memorable element */
.ledger { border: 1px solid var(--black); font-variant-numeric: tabular-nums; }
.ledger-head { display: flex; justify-content: space-between; padding: 16px 20px; border-bottom: 1px solid var(--black); font-weight: 600; font-size: 0.95rem; }
.ledger-limit { padding: 14px 20px; border-bottom: 1px dashed var(--grey-500); display: flex; justify-content: space-between; color: var(--grey-700); font-size: 0.95rem; }
.ledger-row { display: flex; justify-content: space-between; padding: 14px 20px; border-bottom: 1px solid var(--grey-200); opacity: 0; animation: ledger-in 0.4s var(--ease) forwards; }
.ledger-row:nth-of-type(1) { animation-delay: 0.5s; }
.ledger-row:nth-of-type(2) { animation-delay: 1.2s; }
.ledger-row:nth-of-type(3) { animation-delay: 1.9s; }
.ledger-row:nth-of-type(4) { animation-delay: 2.6s; }
.ledger-row--final { border-bottom: 0; background: var(--white); color: var(--black); font-weight: 700; animation: ledger-in 0.4s var(--ease) 3.5s forwards, ledger-sold 0.5s var(--ease) 3.5s forwards; }
.ledger-note { padding: 12px 20px; font-size: 0.85rem; color: var(--grey-500); border-top: 1px solid var(--grey-200); }
@keyframes ledger-in { from { opacity: 0; } to { opacity: 1; } }
@keyframes ledger-sold { from { background: var(--white); color: var(--black); } to { background: var(--black); color: var(--white); } }

@media (max-width: 900px) {
  .hero { padding: 64px 0 72px; }
  .hero-grid { grid-template-columns: 1fr; gap: 56px; }
}

/* ---------- Page header (inner pages) ---------- */
.page-head { padding: 88px 0 72px; border-bottom: 1px solid var(--grey-200); }
.page-head .lede { margin-top: 24px; }

/* ---------- Service rows ---------- */
.rows { border-top: 1px solid var(--black); }
.row { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 48px; padding: 44px 0; border-bottom: 1px solid var(--grey-200); }
.row p { color: var(--grey-700); max-width: 34em; }
.row ul { margin-top: 18px; display: grid; gap: 8px; color: var(--grey-700); }
.row li { padding-left: 20px; position: relative; }
.row li::before { content: ""; position: absolute; left: 0; top: 0.72em; width: 8px; height: 1px; background: var(--black); }
.row-label { font-weight: 600; margin-bottom: 6px; }
@media (max-width: 800px) { .row { grid-template-columns: 1fr; gap: 16px; padding: 32px 0; } }

/* ---------- Section head ---------- */
.split-head { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 48px; margin-bottom: 56px; align-items: end; }
@media (max-width: 800px) { .split-head { grid-template-columns: 1fr; gap: 20px; margin-bottom: 40px; } }

/* ---------- Steps (a real sequence, so numbered) ---------- */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 32px; counter-reset: step; }
.step { border-top: 1px solid var(--black); padding-top: 20px; counter-increment: step; }
.step::before { content: counter(step); font: 400 2.6rem/1 var(--serif); display: block; margin-bottom: 18px; }
.step h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 8px; }
.step p { color: var(--grey-700); font-size: 0.98rem; }
@media (max-width: 900px) { .steps { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .steps { grid-template-columns: 1fr; } }

/* ---------- Principles ---------- */
.principles { display: grid; grid-template-columns: repeat(3, 1fr); gap: 48px; }
.principles h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 10px; }
.principles p { color: var(--grey-700); }
@media (max-width: 800px) { .principles { grid-template-columns: 1fr; gap: 32px; } }

/* ---------- Notice ---------- */
.notice { padding: 28px 0; border-top: 1px solid var(--grey-200); color: var(--grey-500); font-size: 0.95rem; }

/* ---------- CTA band ---------- */
.cta { background: var(--black); color: var(--white); padding: 104px 0; }
.cta-inner { display: flex; justify-content: space-between; align-items: end; gap: 40px; flex-wrap: wrap; }
.cta p { color: #BDBDBD; margin-top: 18px; max-width: 30em; }

/* ---------- Contact ---------- */
.contact-grid { display: grid; grid-template-columns: 0.8fr 1.2fr; gap: 72px; }
.contact-list { display: grid; gap: 28px; }
.contact-list dt { font-weight: 600; margin-bottom: 4px; }
.contact-list dd { margin: 0; color: var(--grey-700); }
.contact-list a { text-underline-offset: 4px; }
.field { display: grid; gap: 8px; margin-bottom: 24px; }
.field label { font-weight: 600; font-size: 0.95rem; }
.field input, .field textarea {
  font: inherit; padding: 14px 16px; border: 1px solid var(--black);
  background: var(--white); border-radius: 0; width: 100%;
}
.field textarea { min-height: 160px; resize: vertical; }
.field input:focus, .field textarea:focus { outline: 2px solid var(--black); outline-offset: 2px; }
.form-note { margin-top: 16px; font-size: 0.92rem; color: var(--grey-500); }
@media (max-width: 800px) { .contact-grid { grid-template-columns: 1fr; gap: 48px; } }

/* ---------- Legal ---------- */
.legal { max-width: 44em; }
.legal h2 { font: 400 2rem/1.15 var(--serif); margin: 52px 0 14px; }
.legal h2:first-of-type { margin-top: 0; }
.legal p, .legal li { color: var(--grey-700); }
.legal p + p { margin-top: 1em; }
.legal ul { margin: 12px 0; padding-left: 20px; list-style: disc; display: grid; gap: 6px; }
.legal .updated { color: var(--grey-500); margin-bottom: 40px; }

/* ---------- 404 ---------- */
.lost { min-height: 62vh; display: flex; align-items: center; }
.lost .display { font-size: clamp(4rem, 12vw, 9rem); }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--black); padding: 64px 0 40px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 48px; }
.footer-grid h2 { font-size: 0.95rem; font-weight: 700; margin-bottom: 16px; font-family: var(--sans); }
.footer-grid ul { display: grid; gap: 10px; }
.footer-grid a { text-decoration: none; color: var(--grey-700); }
.footer-grid a:hover { color: var(--black); text-decoration: underline; text-underline-offset: 4px; }
.footer-brand { font: 400 1.6rem var(--serif); margin-bottom: 12px; }
.footer-grid p { color: var(--grey-500); max-width: 24em; }
.footer-bottom { margin-top: 56px; padding-top: 24px; border-top: 1px solid var(--grey-200); color: var(--grey-500); font-size: 0.92rem; }
@media (max-width: 800px) { .footer-grid { grid-template-columns: 1fr; gap: 36px; } }

/* ---------- Company facts ---------- */
.facts { border-top: 1px solid var(--black); margin: 0; }
.facts > div { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 48px; padding: 24px 0; border-bottom: 1px solid var(--grey-200); }
.facts dt { font-weight: 600; }
.facts dd { margin: 0; color: var(--grey-700); }
.facts a { text-underline-offset: 4px; }
@media (max-width: 800px) { .facts > div { grid-template-columns: 1fr; gap: 6px; } }