/* HBS OPM 68 · site styles */
:root {
  --crimson: #af1f33;
  --crimson-deep: #861523;
  --crimson-ink: #5e0e18;
  --cream: #f8f3ea;
  --cream-2: #f1e9dc;
  --paper: #fffdf9;
  --ink: #1d1a17;
  --ink-2: #4a443d;
  --muted: #857c71;
  --line: #e4d9c8;
  --gold: #e9c98f;
  --serif: "Fraunces", Georgia, serif;
  --sans: "Instrument Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --max: 1160px;
  --gutter: clamp(16px, 4vw, 40px);
  --radius: 4px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; }
::selection { background: var(--crimson); color: #fff; }

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

/* type */
.eyebrow {
  font-family: var(--sans);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .28em;
  text-transform: uppercase;
  color: var(--crimson);
  margin: 0 0 18px;
}
.eyebrow.light { color: var(--gold); }
h1, h2, h3 { font-family: var(--serif); font-weight: 500; line-height: 1.08; margin: 0; letter-spacing: -.01em; }
h2 { font-size: clamp(34px, 5vw, 56px); }
h2 em, h1 em { font-style: italic; color: var(--crimson); }
.on-crimson h2 em, .on-crimson h1 em { color: var(--gold); }
h3 { font-size: clamp(22px, 2.4vw, 28px); }
.lede { font-size: clamp(18px, 1.6vw, 21px); color: var(--ink-2); max-width: 640px; }

/* nav */
.nav {
  position: fixed; inset: 0 0 auto 0; z-index: 50;
  transition: background .35s ease, box-shadow .35s ease, color .35s ease;
  color: #fff;
}
.nav .wrap { display: flex; align-items: center; justify-content: space-between; height: 72px; }
.nav.solid { background: rgba(255, 253, 249, .94); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); box-shadow: 0 1px 0 var(--line); color: var(--ink); }
.nav.on-light { color: var(--ink); }
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; }
.brand-mark {
  width: 40px; height: 40px; border: 1.5px solid currentColor; display: grid; place-items: center;
  font-family: var(--serif); font-style: italic; font-size: 19px; line-height: 1;
}
.brand-text { font-size: 11px; letter-spacing: .22em; text-transform: uppercase; font-weight: 600; line-height: 1.35; }
.brand-text span { display: block; font-weight: 400; opacity: .75; letter-spacing: .18em; }
.nav-links { display: flex; gap: 30px; align-items: center; }
.nav-links a { text-decoration: none; font-size: 13px; letter-spacing: .12em; text-transform: uppercase; font-weight: 500; opacity: .9; }
.nav-links a:hover { opacity: 1; text-decoration: underline; text-underline-offset: 6px; }
.nav-cta { border: 1px solid currentColor; padding: 9px 16px; }
.nav-toggle { display: none; background: none; border: 0; color: inherit; padding: 8px; cursor: pointer; }
.nav-toggle svg { width: 26px; height: 26px; }
@media (max-width: 860px) {
  .nav-toggle { display: block; }
  .nav-links {
    position: fixed; inset: 72px 0 auto 0; flex-direction: column; align-items: stretch; gap: 0;
    background: var(--paper); color: var(--ink); padding: 8px var(--gutter) 24px;
    box-shadow: 0 12px 30px rgba(0,0,0,.08); transform: translateY(-8px); opacity: 0; pointer-events: none;
    transition: opacity .25s ease, transform .25s ease;
  }
  .nav-links a { padding: 16px 0; border-bottom: 1px solid var(--line); font-size: 14px; }
  .nav-cta { border: 0; }
  .nav.open .nav-links { opacity: 1; transform: none; pointer-events: auto; }
  .nav.open { background: var(--paper); color: var(--ink); }
}

/* buttons */
.btn {
  display: inline-flex; align-items: center; gap: 10px; text-decoration: none; cursor: pointer;
  font-family: var(--sans); font-size: 13px; font-weight: 600; letter-spacing: .14em; text-transform: uppercase;
  padding: 16px 26px; border: 1px solid transparent; border-radius: var(--radius);
  transition: background .2s ease, color .2s ease, border-color .2s ease, transform .2s ease;
}
.btn svg { width: 16px; height: 16px; flex: none; }
.btn:hover { transform: translateY(-1px); }
.btn-crimson { background: var(--crimson); color: #fff; }
.btn-crimson:hover { background: var(--crimson-deep); }
.btn-light { background: var(--cream); color: var(--crimson-ink); }
.btn-light:hover { background: #fff; }
.btn-ghost { border-color: currentColor; color: inherit; background: transparent; }
.btn-ghost:hover { background: rgba(255,255,255,.08); }
.btn-row { display: flex; flex-wrap: wrap; gap: 14px; }

/* sections */
section { position: relative; overflow-x: clip; }
.pad { padding: clamp(80px, 11vw, 140px) 0; }
.on-crimson { background: var(--crimson); color: #fff; }
.on-cream { background: var(--cream); }
.section-head { display: grid; grid-template-columns: 1fr; gap: 20px; margin-bottom: clamp(40px, 6vw, 72px); }
@media (min-width: 900px) { .section-head.split { grid-template-columns: 1fr 1fr; align-items: end; gap: 60px; } }
.rule { width: 64px; height: 1px; background: currentColor; opacity: .6; border: 0; margin: 28px 0; }

/* hero */
.hero {
  min-height: 100svh; display: flex; align-items: center; color: #fff; overflow: hidden;
  background:
    radial-gradient(1200px 600px at 85% 10%, rgba(255,255,255,.10), transparent 60%),
    radial-gradient(900px 700px at 0% 100%, rgba(0,0,0,.28), transparent 60%),
    var(--crimson);
  padding: 120px 0 80px;
}
.hero .wrap { position: relative; z-index: 2; }
.hero-pattern { position: absolute; inset: 0; opacity: .08; z-index: 1; pointer-events: none; }
.hero-kicker { display: flex; justify-content: space-between; gap: 20px; font-size: 11px; letter-spacing: .3em; text-transform: uppercase; opacity: .8; margin-bottom: clamp(40px, 8vh, 90px); }
.hero h1 { font-size: clamp(64px, 13vw, 176px); line-height: .9; font-weight: 400; }
.hero h1 .num { font-style: italic; display: inline-block; }
.hero-sub { font-family: var(--serif); font-style: italic; font-size: clamp(22px, 2.6vw, 32px); margin: 26px 0 10px; opacity: .95; }
.hero-tag { font-size: 12px; letter-spacing: .34em; text-transform: uppercase; color: var(--gold); margin: 0 0 44px; }
.hero-foot { position: absolute; left: 0; right: 0; bottom: 28px; z-index: 2; }
.hero-foot .wrap { display: flex; justify-content: space-between; align-items: center; font-size: 11px; letter-spacing: .26em; text-transform: uppercase; opacity: .75; }
.scroll-cue { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; }
.scroll-cue i { width: 1px; height: 34px; background: currentColor; display: block; animation: cue 2.2s ease-in-out infinite; transform-origin: top; }
@keyframes cue { 0%,100% { transform: scaleY(.3); opacity: .4; } 50% { transform: scaleY(1); opacity: 1; } }
@media (max-width: 600px) { .hero-foot .hide-sm { display: none; } }

/* intro / about */
.about-grid { display: grid; gap: 50px; }
@media (min-width: 900px) { .about-grid { grid-template-columns: 5fr 6fr; gap: 90px; } }
.big-quote { font-family: var(--serif); font-size: clamp(28px, 3.4vw, 42px); line-height: 1.25; margin: 0; }
.big-quote em { color: var(--crimson); }
.pillars { display: grid; gap: 0; margin-top: 10px; }
.pillar { display: grid; grid-template-columns: 56px 1fr; gap: 16px; padding: 24px 0; border-top: 1px solid var(--line); }
.pillar:last-child { border-bottom: 1px solid var(--line); }
.pillar b { font-family: var(--serif); font-style: italic; font-weight: 400; font-size: 28px; color: var(--crimson); line-height: 1; }
.pillar h3 { font-size: 22px; margin-bottom: 6px; }
.pillar p { margin: 0; color: var(--ink-2); font-size: 16px; }

/* featured event */
.feature { display: grid; gap: 0; background: var(--crimson); color: #fff; border-radius: var(--radius); overflow: hidden; box-shadow: 0 30px 60px -30px rgba(94,14,24,.55); }
@media (min-width: 900px) { .feature { grid-template-columns: 5fr 6fr; } }
.feature-media { background: var(--crimson-deep); display: grid; place-items: center; padding: clamp(28px, 4vw, 54px); }
.feature-media img { width: 100%; max-width: 360px; box-shadow: 0 24px 50px rgba(0,0,0,.35); border-radius: 2px; }
.feature-body { padding: clamp(32px, 5vw, 64px); display: flex; flex-direction: column; }
.feature-body h3 { font-size: clamp(40px, 5vw, 64px); font-weight: 400; }
.feature-body h3 em { font-style: italic; }
.feature-meta { display: flex; flex-wrap: wrap; gap: 8px 24px; font-size: 12px; letter-spacing: .2em; text-transform: uppercase; color: var(--gold); margin: 16px 0 24px; }
.feature-body p { opacity: .92; margin: 0 0 28px; }
.feature-body .btn-row { margin-top: auto; }

/* countdown */
.countdown { display: flex; gap: clamp(10px, 2vw, 22px); margin: 6px 0 32px; flex-wrap: wrap; }
.countdown div { min-width: 64px; }
.countdown b { display: block; font-family: var(--serif); font-size: clamp(34px, 4vw, 48px); font-weight: 400; line-height: 1; font-variant-numeric: tabular-nums; }
.countdown span { font-size: 10px; letter-spacing: .24em; text-transform: uppercase; opacity: .75; }
.countdown.dark b { color: var(--crimson); }
.countdown.dark span { color: var(--muted); opacity: 1; }

/* event list */
.events { display: grid; gap: 0; border-top: 1px solid var(--line); }
.event-row {
  display: grid; grid-template-columns: 90px 1fr auto; gap: 20px; align-items: center;
  padding: 28px 0; border-bottom: 1px solid var(--line); text-decoration: none; transition: background .2s ease;
}
a.event-row:hover { background: var(--cream); }
a.event-row:hover .arrow { transform: translateX(6px); color: var(--crimson); }
.event-date { font-family: var(--serif); line-height: 1; }
.event-date b { display: block; font-size: 40px; font-weight: 400; color: var(--crimson); }
.event-date span { font-family: var(--sans); font-size: 11px; letter-spacing: .22em; text-transform: uppercase; color: var(--muted); }
.event-row h3 { font-size: clamp(22px, 2.6vw, 30px); }
.event-row p { margin: 4px 0 0; color: var(--ink-2); font-size: 15px; }
.tag { display: inline-block; font-size: 10px; font-weight: 600; letter-spacing: .2em; text-transform: uppercase; padding: 5px 10px; border-radius: 99px; background: var(--crimson); color: #fff; margin-left: 10px; vertical-align: middle; }
.tag.soft { background: var(--cream-2); color: var(--ink-2); }
.arrow { width: 28px; height: 28px; color: var(--muted); transition: transform .25s ease, color .25s ease; }
.event-row.tbc { opacity: .75; }
.event-row.tbc .event-date b { color: var(--muted); font-style: italic; }
@media (max-width: 600px) {
  .event-row { grid-template-columns: 64px 1fr; padding: 22px 0; }
  .event-row .arrow { display: none; }
  .event-date b { font-size: 32px; }
}

/* connect cards */
.cards { display: grid; gap: 1px; background: var(--line); border: 1px solid var(--line); }
@media (min-width: 700px) { .cards { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1000px) { .cards { grid-template-columns: repeat(4, 1fr); } }
.card { background: var(--paper); padding: 34px 28px; text-decoration: none; display: flex; flex-direction: column; gap: 10px; transition: background .2s ease; min-height: 210px; }
.card:hover { background: var(--cream); }
.card small { font-size: 11px; letter-spacing: .24em; text-transform: uppercase; color: var(--crimson); font-weight: 600; }
.card h3 { font-size: 24px; }
.card p { margin: 0; color: var(--ink-2); font-size: 15px; word-break: break-word; }
.card .go { margin-top: auto; font-size: 13px; color: var(--crimson); font-weight: 600; letter-spacing: .08em; }

/* footer */
.footer { background: var(--crimson-ink); color: rgba(255,255,255,.85); padding: 70px 0 34px; font-size: 14px; }
.footer-top { display: grid; gap: 40px; padding-bottom: 44px; border-bottom: 1px solid rgba(255,255,255,.15); }
@media (min-width: 800px) { .footer-top { grid-template-columns: 2fr 1fr 1fr; } }
.footer h4 { font-family: var(--sans); font-size: 11px; letter-spacing: .26em; text-transform: uppercase; color: var(--gold); margin: 0 0 16px; font-weight: 600; }
.footer ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.footer a { text-decoration: none; }
.footer a:hover { color: #fff; text-decoration: underline; text-underline-offset: 4px; }
.footer-sign { font-family: var(--serif); font-style: italic; font-size: 30px; color: #fff; margin: 14px 0 8px; line-height: 1.15; }
.footer-bottom span:last-child { max-width: 560px; }
.footer-bottom { display: flex; flex-wrap: wrap; gap: 10px 30px; justify-content: space-between; padding-top: 26px; font-size: 12px; opacity: .7; letter-spacing: .04em; }

/* ===== Event page ===== */
.ev-hero { min-height: 100svh; }
.ev-hero h1 { font-size: clamp(58px, 8.5vw, 112px); font-style: italic; font-weight: 600; line-height: .94; letter-spacing: -.02em; }
.ev-hero .assoc { margin: -14px 0 34px; }
.ev-hero .assoc small { display: block; font-size: 11px; letter-spacing: .3em; text-transform: uppercase; color: var(--gold); }
.ev-hero .assoc b { display: block; font-family: var(--serif); font-weight: 500; font-size: clamp(22px, 2.6vw, 30px); margin-top: 4px; }
.ev-hero .pre { font-size: clamp(16px, 2vw, 22px); letter-spacing: .3em; text-transform: uppercase; margin: 0 0 6px; font-weight: 500; }
.ev-hero .city { font-size: clamp(18px, 2.4vw, 30px); letter-spacing: .14em; text-transform: uppercase; margin: 10px 0 0; font-weight: 500; }
.ev-hero .dates { font-family: var(--serif); font-size: clamp(30px, 3.6vw, 46px); margin: 26px 0 6px; line-height: 1.1; }
.ev-hero .where { font-size: 12px; letter-spacing: .32em; text-transform: uppercase; opacity: .85; margin: 0 0 36px; }
.ev-hero .center { text-align: center; }
.ev-hero .center .btn-row, .ev-hero .center .countdown { justify-content: center; }

.stats { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }
@media (min-width: 760px) { .stats { grid-template-columns: repeat(5, 1fr); } }
.stat { background: var(--paper); padding: 34px 20px; text-align: center; }
.stat b { display: block; font-family: var(--serif); font-size: clamp(44px, 5vw, 64px); font-weight: 400; color: var(--crimson); line-height: 1; }
.stat span { display: block; margin-top: 10px; font-size: 11px; letter-spacing: .22em; text-transform: uppercase; color: var(--ink-2); font-weight: 600; }
@media (max-width: 759px) { .stat:last-child { grid-column: 1 / -1; } }

/* timeline */
.days { border-top: 1px solid var(--crimson); }
.day { display: grid; grid-template-columns: 96px 1fr; gap: 24px; padding: 34px 0; border-bottom: 1px solid var(--line); }
@media (min-width: 900px) { .day { grid-template-columns: 140px 1fr 1fr; gap: 40px; padding: 44px 0; } }
.day-date { color: var(--crimson); line-height: 1; }
.day-date small { display: block; font-size: 11px; letter-spacing: .24em; text-transform: uppercase; font-weight: 600; }
.day-date b { display: block; font-family: var(--serif); font-weight: 400; font-size: clamp(48px, 5vw, 64px); margin: 6px 0; }
.day-main .eyebrow { margin-bottom: 10px; }
.day-main h3 { font-size: clamp(24px, 2.6vw, 32px); margin-bottom: 10px; }
.day-main p { margin: 0; color: var(--ink-2); }
.day-items { list-style: none; margin: 0; padding: 0; display: grid; gap: 12px; align-content: start; }
.day-items li { padding-left: 22px; position: relative; font-size: 16px; }
.day-items li::before { content: ""; position: absolute; left: 0; top: 11px; width: 10px; height: 1px; background: var(--crimson); }
.day-items li b { font-weight: 600; }
.day-note { grid-column: 2 / -1; font-size: 14px; color: var(--muted); margin: -4px 0 0; display: flex; gap: 10px; align-items: baseline; }
.day-note::before { content: "Note"; font-size: 10px; letter-spacing: .2em; text-transform: uppercase; font-weight: 600; color: var(--crimson); }
@media (max-width: 899px) { .day-items { grid-column: 2; } }
.fine { font-size: 14px; color: var(--muted); margin-top: 26px; font-style: italic; }

/* two-up feature blocks */
.duo { display: grid; gap: 24px; }
@media (min-width: 900px) { .duo { grid-template-columns: 1fr 1fr; } }
.panel { padding: clamp(32px, 5vw, 56px); border-radius: var(--radius); display: flex; flex-direction: column; gap: 14px; }
.panel.crimson { background: var(--crimson); color: #fff; }
.panel.cream { background: var(--cream); }
.panel h3 { font-size: clamp(30px, 3.4vw, 42px); }
.panel h3 em { font-style: italic; }
.panel.crimson h3 em { color: var(--gold); }
.panel.cream h3 em { color: var(--crimson); }
.panel p { margin: 0; }
.panel .meta { font-size: 13px; letter-spacing: .1em; opacity: .85; margin-top: auto; padding-top: 18px; border-top: 1px solid currentColor; border-color: rgba(127,127,127,.3); }
.prof { display: flex; gap: 18px; align-items: center; margin: 6px 0; }
.prof .mono { width: 64px; height: 64px; border-radius: 50%; border: 1px solid rgba(255,255,255,.5); display: grid; place-items: center; font-family: var(--serif); font-style: italic; font-size: 22px; flex: none; }
.prof b { font-family: var(--serif); font-size: 24px; font-weight: 500; display: block; line-height: 1.2; }
.prof span { font-size: 14px; opacity: .85; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip { font-size: 12px; letter-spacing: .06em; padding: 7px 12px; border: 1px solid rgba(127,127,127,.35); border-radius: 99px; }
.panel.crimson .chip { border-color: rgba(255,255,255,.4); }

/* download band */
.download { display: grid; gap: 40px; align-items: center; }
@media (min-width: 900px) { .download { grid-template-columns: 1fr 1.2fr; gap: 80px; } }
.pdf-stack { position: relative; max-width: 380px; margin: 0 auto; width: 100%; }
.pdf-stack img { position: relative; z-index: 2; box-shadow: 0 30px 60px -20px rgba(0,0,0,.5); border-radius: 2px; transform: rotate(-2deg); }
.pdf-stack::before { content: ""; position: absolute; inset: 0; background: var(--cream); transform: rotate(4deg) translate(16px, 6px); z-index: 1; border-radius: 2px; opacity: .9; }
.file-meta { display: flex; gap: 18px; font-size: 12px; letter-spacing: .18em; text-transform: uppercase; opacity: .75; margin: 18px 0 0; flex-wrap: wrap; }

/* committee */
.committee { display: grid; gap: 50px; }
@media (min-width: 900px) { .committee { grid-template-columns: 2fr 1fr; gap: 80px; } }
.people { display: grid; grid-template-columns: repeat(auto-fill, minmax(190px, 1fr)); gap: 14px; list-style: none; padding: 0; margin: 0; }
.person { display: flex; align-items: center; gap: 14px; padding: 14px; background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius); }
.person i { font-style: normal; width: 44px; height: 44px; border-radius: 50%; background: var(--crimson); color: #fff; display: grid; place-items: center; font-family: var(--serif); font-size: 16px; flex: none; }
.person span { font-size: 15px; font-weight: 500; line-height: 1.3; }
.committee h3 { font-size: 13px; font-family: var(--sans); letter-spacing: .24em; text-transform: uppercase; font-weight: 600; color: var(--crimson); margin-bottom: 18px; }

/* contact list */
.contact-grid { display: grid; gap: 1px; background: rgba(255,255,255,.18); border: 1px solid rgba(255,255,255,.18); }
@media (min-width: 760px) { .contact-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1100px) { .contact-grid { grid-template-columns: repeat(4, 1fr); } }
.contact { background: var(--crimson); padding: 30px 26px; text-decoration: none; display: flex; flex-direction: column; gap: 8px; transition: background .2s ease; }
.contact:hover { background: var(--crimson-deep); }
.contact small { font-size: 11px; letter-spacing: .24em; text-transform: uppercase; color: var(--gold); font-weight: 600; }
.contact b { font-family: var(--serif); font-size: 22px; font-weight: 500; }
.contact span { font-size: 14px; opacity: .85; word-break: break-word; }

/* floating WhatsApp */
.wa {
  position: fixed; right: 18px; bottom: 18px; z-index: 60; width: 56px; height: 56px; border-radius: 50%;
  background: #25d366; color: #fff; display: grid; place-items: center; box-shadow: 0 10px 24px rgba(0,0,0,.25);
  transition: transform .2s ease;
}
.wa:hover { transform: scale(1.06); }
.wa svg { width: 28px; height: 28px; }

/* reveal */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .9s cubic-bezier(.2,.7,.2,1), transform .9s cubic-bezier(.2,.7,.2,1); }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
  .scroll-cue i { animation: none; }
}
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }