/* The Third Horizon Group — premium consulting identity
   Brand system: warm minimalism, horizon motif, charcoal/ivory/brass.
   Voice in copy: calm, capable, exact. */

:root {
  --navy: #15233E;
  --navy-700: #1d2f4f;
  --ink: #191B1F;
  --ivory: #F5F0E6;
  --paper: #FBF8F1;
  --sand: #EFE7D8;
  --brass: #B89B5E;
  --brass-deep: #9a7e44;
  --slate: #61707E;
  --bluegray: #8DA0AE;
  --line: rgba(25, 27, 31, 0.12);
  --line-strong: rgba(25, 27, 31, 0.22);

  --serif: "Didot", "Didot LT STD", "Bodoni 72", "Hoefler Text", "Playfair Display", Georgia, serif;
  --sans: "Avenir Next", "Avenir Next LT Pro", "Avenir", "Segoe UI", Roboto, system-ui, sans-serif;

  --maxw: 1180px;
  --gutter: clamp(1.25rem, 5vw, 4rem);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--sans);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.65;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding-inline: var(--gutter); }

/* ---------- Type ---------- */
h1, h2, h3 { font-family: var(--serif); font-weight: 400; color: var(--navy); margin: 0; letter-spacing: -0.01em; }
h1 { font-size: clamp(2.6rem, 6.2vw, 4.6rem); line-height: 1.04; }
h2 { font-size: clamp(2rem, 4.2vw, 3.1rem); line-height: 1.08; }
h3 { font-size: 1.3rem; line-height: 1.25; }
p { margin: 0 0 1.1rem; }
.lead { font-size: clamp(1.12rem, 1.9vw, 1.4rem); color: #41454b; line-height: 1.55; max-width: 40ch; }

.eyebrow {
  font-family: var(--sans);
  text-transform: uppercase;
  letter-spacing: 0.22em;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--brass-deep);
  margin: 0 0 1.1rem;
}
.eyebrow.on-dark { color: var(--brass); }

/* ---------- Horizon mark + wordmark ---------- */
.horizon-mark { width: 46px; height: auto; flex: none; }
.horizon-mark .a1 { fill: var(--brass); }
.horizon-mark .a2 { fill: var(--bluegray); }
.horizon-mark .a3 { fill: var(--navy); }
.on-dark .horizon-mark .a3, .lockup--invert .horizon-mark .a3 { fill: var(--ivory); }

.lockup { display: inline-flex; align-items: center; gap: 0.85rem; }
.lockup .wm { font-family: var(--serif); color: var(--navy); line-height: 1; }
.lockup .wm b { display: block; font-weight: 500; font-size: 1.04rem; letter-spacing: 0.02em; }
.lockup .wm span { display: block; font-family: var(--sans); font-size: 0.56rem; letter-spacing: 0.34em; text-transform: uppercase; color: var(--brass-deep); margin-top: 0.28rem; }
.lockup--invert .wm, .lockup--invert .wm b { color: var(--ivory); }
.lockup--invert .wm span { color: var(--brass); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  font-family: var(--sans); font-weight: 600; font-size: 0.92rem; letter-spacing: 0.01em;
  padding: 0.85rem 1.5rem; border-radius: 2px; border: 1px solid var(--navy);
  background: var(--navy); color: var(--ivory); cursor: pointer;
  transition: background .2s, color .2s, border-color .2s, transform .2s;
}
.btn:hover { background: var(--navy-700); transform: translateY(-1px); }
.btn--ghost { background: transparent; color: var(--navy); border-color: var(--line-strong); }
.btn--ghost:hover { background: transparent; border-color: var(--navy); }
.btn--brass { background: var(--brass); border-color: var(--brass); color: var(--navy); }
.btn--brass:hover { background: var(--brass-deep); border-color: var(--brass-deep); color: var(--ivory); }
.btn--on-dark.btn--ghost { color: var(--ivory); border-color: rgba(245,240,230,0.3); }
.btn--on-dark.btn--ghost:hover { border-color: var(--ivory); }

.arrowlink { font-weight: 600; font-size: 0.92rem; color: var(--navy); border-bottom: 1px solid var(--brass); padding-bottom: 2px; }
.arrowlink:hover { color: var(--brass-deep); }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(251, 248, 241, 0.86); backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; height: 76px; }
.nav-links { display: flex; align-items: center; gap: 2rem; }
.nav-links a { font-size: 0.9rem; font-weight: 500; color: #3a3e44; letter-spacing: 0.01em; }
.nav-links a:hover { color: var(--brass-deep); }
.header-cta { display: inline-flex; align-items: center; gap: 1.5rem; }

/* ---------- Hero ---------- */
.hero { position: relative; padding: clamp(3.5rem, 9vw, 7.5rem) 0 clamp(3rem, 7vw, 6rem); overflow: hidden; }
.hero::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 1px;
  background: linear-gradient(90deg, transparent, var(--line-strong) 20%, var(--line-strong) 80%, transparent);
}
.hero-grid { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: clamp(2rem, 5vw, 4.5rem); align-items: center; }
.hero h1 { margin-bottom: 1.4rem; }
.hero h1 em { font-style: italic; color: var(--brass-deep); }
.hero .lead { max-width: 46ch; margin-bottom: 2rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 0.9rem; align-items: center; }
.hero-aside { display: flex; justify-content: center; }
.hero-aside .horizon-mark { width: min(320px, 80%); }

/* Pillar strip under hero */
.pillars { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; border-top: 0; }
.pillars .wrap { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; }
.pillar { padding: 2.2rem 0; }
.pillar + .pillar { border-left: 1px solid var(--line); padding-left: clamp(1rem, 3vw, 2.5rem); }
.pillar .n { font-family: var(--serif); font-size: 1.5rem; color: var(--brass); }
.pillar h3 { margin: 0.4rem 0 0.4rem; }
.pillar p { font-size: 0.95rem; color: var(--slate); margin: 0; max-width: 30ch; }

/* ---------- Sections ---------- */
section { padding-block: clamp(3.5rem, 8vw, 7rem); }
.section-head { max-width: 56ch; margin-bottom: clamp(2.2rem, 4vw, 3.5rem); }
.section-head p { color: #41454b; margin-top: 0.9rem; }

/* Thesis band (dark) */
.band-dark { background: var(--navy); color: var(--ivory); position: relative; overflow: hidden; }
.band-dark h2, .band-dark h3 { color: var(--ivory); }
.band-dark .thesis-grid { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(2rem, 6vw, 5rem); align-items: center; }
.band-dark .quote { font-family: var(--serif); font-size: clamp(1.8rem, 3.4vw, 2.7rem); line-height: 1.18; color: var(--ivory); }
.band-dark .quote em { font-style: italic; color: var(--brass); }
.band-dark p { color: #c8cdd6; }
.band-dark .horizon-bg {
  position: absolute; right: -6%; top: 50%; transform: translateY(-50%);
  width: 46%; opacity: 0.14; pointer-events: none;
}

/* Services */
.svc-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.svc {
  background: var(--paper); padding: 2.2rem 1.9rem 2.4rem;
  display: flex; flex-direction: column; gap: 0.7rem; position: relative;
  transition: background .25s;
}
.svc:hover { background: #fff; }
.svc::before { content: ""; position: absolute; top: 0; left: 0; width: 38px; height: 2px; background: var(--brass); }
.svc .num { font-family: var(--serif); font-size: 0.95rem; color: var(--brass-deep); letter-spacing: 0.05em; }
.svc h3 { color: var(--navy); }
.svc p { font-size: 0.95rem; color: #4a4e54; margin: 0; line-height: 1.6; }
.svc .tag { margin-top: auto; padding-top: 1rem; font-size: 0.74rem; letter-spacing: 0.16em; text-transform: uppercase; color: var(--slate); }

/* Approach steps */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: clamp(1.2rem, 3vw, 2.4rem); }
.step { border-top: 1px solid var(--line-strong); padding-top: 1.3rem; }
.step .s-n { font-family: var(--sans); font-weight: 700; font-size: 0.78rem; letter-spacing: 0.18em; color: var(--brass-deep); }
.step h3 { font-size: 1.15rem; margin: 0.7rem 0 0.5rem; }
.step p { font-size: 0.92rem; color: var(--slate); margin: 0; }

/* Engagements */
.eng-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(1.2rem, 3vw, 2rem); }
.eng { background: var(--ivory); border: 1px solid var(--line); padding: 2rem 1.8rem; border-radius: 2px; }
.eng h3 { font-size: 1.2rem; margin-bottom: 0.6rem; }
.eng p { font-size: 0.94rem; color: #4a4e54; margin: 0; }
.eng .k { display: block; font-size: 0.74rem; letter-spacing: 0.16em; text-transform: uppercase; color: var(--brass-deep); margin-bottom: 0.9rem; }

/* About */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(2rem, 6vw, 5rem); align-items: start; }
.about-grid .lede { font-family: var(--serif); font-size: clamp(1.4rem, 2.6vw, 1.9rem); line-height: 1.35; color: var(--navy); }
.about-meta { border-top: 1px solid var(--line); }
.about-meta .row { display: flex; justify-content: space-between; gap: 1rem; padding: 0.95rem 0; border-bottom: 1px solid var(--line); font-size: 0.92rem; }
.about-meta .row dt { color: var(--slate); }
.about-meta .row dd { margin: 0; color: var(--ink); font-weight: 500; text-align: right; }

/* Contact */
.contact { background: var(--sand); }
.contact-grid { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: clamp(2rem, 5vw, 4rem); align-items: center; }
.contact h2 { margin-bottom: 1rem; }
.contact .lead { color: #41454b; }
.contact-card { background: var(--paper); border: 1px solid var(--line); padding: 2.2rem; border-radius: 2px; }
.contact-card .k { font-size: 0.74rem; letter-spacing: 0.16em; text-transform: uppercase; color: var(--brass-deep); }
.contact-card .email { font-family: var(--serif); font-size: clamp(1.25rem, 2.4vw, 1.7rem); color: var(--navy); margin: 0.5rem 0 1.6rem; word-break: break-word; }

/* ---------- Footer ---------- */
.site-footer { background: var(--navy); color: #aeb6c2; padding-block: clamp(3rem, 6vw, 4.5rem) 2rem; }
.site-footer .top { display: flex; justify-content: space-between; align-items: flex-start; gap: 2rem; flex-wrap: wrap; padding-bottom: 2.2rem; border-bottom: 1px solid rgba(245,240,230,0.12); }
.site-footer .tagline { font-family: var(--serif); color: var(--ivory); font-size: 1.25rem; max-width: 24ch; }
.site-footer nav { display: flex; gap: 1.6rem; flex-wrap: wrap; }
.site-footer nav a { color: #aeb6c2; font-size: 0.9rem; }
.site-footer nav a:hover { color: var(--brass); }
.site-footer .legal { display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; padding-top: 1.6rem; font-size: 0.8rem; color: #7c8696; }

/* ---------- Reveal ---------- */
.reveal { opacity: 0; transform: translateY(14px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in { opacity: 1; transform: none; }

/* ---------- Responsive ---------- */
.menu-toggle { display: none; }
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-aside { display: none; }
  .pillars .wrap, .svc-grid, .eng-grid { grid-template-columns: 1fr; }
  .pillar + .pillar { border-left: 0; border-top: 1px solid var(--line); padding-left: 0; }
  .svc-grid { gap: 1px; }
  .steps { grid-template-columns: 1fr 1fr; }
  .band-dark .thesis-grid, .about-grid, .contact-grid { grid-template-columns: 1fr; }
  .band-dark .horizon-bg { display: none; }
  .nav-links { display: none; }
}
@media (max-width: 520px) {
  .steps { grid-template-columns: 1fr; }
  .header-cta .btn { padding: 0.7rem 1.1rem; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { transition: none; opacity: 1; transform: none; }
  .btn:hover { transform: none; }
}