/* ============================================================
   Sigma Nu — Gamma Alpha · Georgia Tech
   Theme: Midnight Navy (dark) + GT old gold
   ============================================================ */
:root {
  --bg: #0d1b2a;         /* page background — deep midnight navy */
  --bg-2: #091522;       /* darkest bands: hero, cta, footer, creed */
  --panel: #16273c;      /* raised alt sections, cards, nav surfaces */
  --panel-2: #1b2e46;    /* lifted navy: facts / page hero / afsp band */
  --line: #294056;       /* borders on dark */

  --ink: #e7e3d7;        /* body text — warm off-white */
  --head: #f4f0e6;       /* headings — near white */
  --gray: #9fa9b4;       /* muted / secondary text */

  --gold: #c6ab6b;       /* GT old gold, brightened for dark bg */
  --gold-dark: #a98f52;  /* deeper gold for hovers */
  --gold-soft: rgba(198,171,107,0.16);

  --white: #ffffff;      /* pure white where needed */

  --serif: "Cormorant Garamond", Georgia, serif;
  --sans: "Source Sans 3", "Helvetica Neue", Arial, sans-serif;

  --maxw: 1120px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: var(--sans);
  color: var(--ink);
  background: var(--bg);
  font-size: 1.0625rem;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: var(--gold); }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ---------- Type ---------- */
h1, h2, h3 {
  font-family: var(--serif);
  font-weight: 600;
  color: var(--head);
  line-height: 1.12;
}
h1 { font-size: clamp(2.6rem, 5.5vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 2.75rem); }
h3 { font-size: 1.4rem; }

.kicker {
  font-family: var(--sans);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--gold);
  display: block;
  margin-bottom: 12px;
}

.lede { font-size: 1.15rem; color: var(--gray); max-width: 62ch; }

.rule {
  width: 56px; height: 2px;
  background: var(--gold);
  border: none;
  margin: 22px 0;
}
.rule.center { margin-left: auto; margin-right: auto; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  font-family: var(--sans);
  font-weight: 700;
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  text-decoration: none;
  padding: 15px 30px;
  border: 1px solid transparent;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
  cursor: pointer;
}
.btn:focus-visible { outline: 3px solid var(--gold); outline-offset: 3px; }
.btn-gold { background: var(--gold); color: #12100b; }
.btn-gold:hover { background: #d8bf82; color: #12100b; }
/* solid button on a dark page → panel that lifts to gold on hover */
.btn-dark { background: var(--panel-2); color: var(--head); border-color: var(--line); }
.btn-dark:hover { background: var(--gold); color: #12100b; border-color: var(--gold); }
/* secondary gold outline */
.btn-navy { background: transparent; color: var(--gold); border-color: var(--gold); }
.btn-navy:hover { background: var(--gold); color: #12100b; }
.btn-ghost { border-color: rgba(255,255,255,0.45); color: var(--head); background: transparent; }
.btn-ghost:hover { background: var(--head); color: var(--bg); border-color: var(--head); }
.btn-ghost-light { border-color: rgba(255,255,255,0.6); color: var(--white); background: transparent; }
.btn-ghost-light:hover { background: var(--white); color: var(--bg); border-color: var(--white); }

/* ---------- Top bar + Nav ---------- */
.topbar {
  background: var(--bg-2);
  color: rgba(255,255,255,0.7);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  text-align: center;
  padding: 8px 16px;
  border-bottom: 1px solid rgba(255,255,255,0.05);
}
.topbar strong { color: var(--gold); font-weight: 600; }

.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(13,27,42,0.92);
  backdrop-filter: saturate(1.2) blur(8px);
  border-bottom: 1px solid var(--line);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 78px; }
.brand { display: flex; align-items: center; gap: 14px; text-decoration: none; }
.brand-letters {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 1.7rem;
  color: var(--head);
  border: 2px solid var(--gold);
  padding: 2px 10px;
  line-height: 1.3;
}
.brand-name {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--head);
  line-height: 1.2;
}
.brand-name small {
  display: block;
  font-family: var(--sans);
  font-weight: 700;
  font-size: 0.62rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gold);
}
.nav-links { display: flex; align-items: center; gap: 26px; list-style: none; }
.nav-links a {
  text-decoration: none;
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink);
  padding: 6px 0;
  border-bottom: 2px solid transparent;
}
.nav-links a:hover { color: var(--head); border-bottom-color: var(--gold); }
.nav-links a.active { border-bottom-color: var(--gold); color: var(--head); }
.nav-links .btn { padding: 11px 20px; border-bottom: none; }
.nav-links .btn:hover { border-bottom: none; }
.nav-toggle {
  display: none;
  background: none; border: none;
  font-size: 1.6rem; color: var(--head);
  cursor: pointer;
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 82vh;
  display: grid;
  place-items: center;
  text-align: center;
  color: var(--white);
  background: var(--bg-2);
}
.hero-photo {
  position: absolute; inset: 0;
  display: grid; place-items: center;
  background:
    linear-gradient(rgba(6,14,24,0.55), rgba(6,14,24,0.78)),
    repeating-linear-gradient(0deg, #12283f 0 2px, #16304a 2px 4px);
}
.hero-photo span {
  position: absolute; bottom: 18px; right: 18px;
  font-size: 0.68rem; letter-spacing: 0.18em; text-transform: uppercase;
  color: rgba(255,255,255,0.45);
  border: 1px dashed rgba(255,255,255,0.3);
  padding: 6px 12px;
}
.hero-content { position: relative; padding: 96px 24px; max-width: 760px; }
.hero-letters {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 1.4rem;
  letter-spacing: 0.35em;
  color: var(--gold);
  margin-bottom: 18px;
}
.hero h1 { color: var(--white); font-weight: 500; }
.hero .motto {
  font-family: var(--serif);
  font-style: italic;
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  color: var(--gold);
  margin: 18px 0 8px;
}
.hero .est {
  font-size: 0.78rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.7);
  margin-bottom: 36px;
}
.hero-ctas { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* ---------- Facts strip ---------- */
.facts {
  background: var(--panel-2);
  color: var(--white);
  background-image: linear-gradient(180deg, rgba(255,255,255,0.03), rgba(0,0,0,0.06));
  border-top: 3px solid var(--gold);
  border-bottom: 1px solid var(--line);
}
.facts-inner {
  display: grid; grid-template-columns: repeat(4, 1fr);
  text-align: center;
}
.fact { padding: 34px 16px; border-left: 1px solid rgba(255,255,255,0.10); }
.fact:first-child { border-left: none; }
.fact .num { font-family: var(--serif); font-weight: 600; font-size: 2.1rem; color: var(--gold); line-height: 1.1; font-variant-numeric: tabular-nums; }
.fact .label {
  font-size: 0.7rem; letter-spacing: 0.2em; text-transform: uppercase;
  color: rgba(255,255,255,0.6); margin-top: 6px;
}

/* ---------- Sections ---------- */
.section { padding: 92px 0; }
.section-off { background: var(--panel); }
.section-dark { background: var(--bg-2); color: var(--white); }
.section-dark h2, .section-dark h3 { color: var(--head); }
.section-head { margin-bottom: 48px; }
.section-head.center { text-align: center; }
.section-head.center .lede { margin: 0 auto; }

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }

/* ---------- Photo placeholders ---------- */
.photo {
  background:
    linear-gradient(rgba(255,255,255,0.02), rgba(255,255,255,0.02)),
    repeating-linear-gradient(0deg, #12283f 0 2px, #16304a 2px 4px);
  border: 1px solid var(--line);
  min-height: 300px;
  display: grid; place-items: center;
  color: var(--gray);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  text-align: center;
  padding: 16px;
  line-height: 2;
}
.photo.tall { min-height: 460px; }
.photo.short { min-height: 220px; }
/* .photo.filled — real image; pair with inline style="background-image:url('assets/…')" */
.photo.filled {
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  color: transparent;
  font-size: 0;
}
.hero-photo.filled { background-repeat: no-repeat; }
.hero-photo.filled span { display: none; }
.photo.dark {
  background:
    linear-gradient(rgba(6,14,24,0.4), rgba(6,14,24,0.4)),
    repeating-linear-gradient(0deg, #0f2136 0 2px, #13263c 2px 4px);
  border-color: var(--line);
  color: rgba(255,255,255,0.55);
}

/* ---------- Creed ---------- */
.creed { text-align: center; padding: 110px 24px; }
.creed .kicker { color: var(--gold); }
.creed-lines {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 500;
  font-size: clamp(1.5rem, 3.4vw, 2.3rem);
  line-height: 1.55;
  color: var(--white);
  max-width: 640px;
  margin: 0 auto;
}
.creed-lines em { color: var(--gold); font-style: italic; }

/* ---------- Officer cards ---------- */
.officers {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
  max-width: 1000px;
  margin: 0 auto;
}
.officer { text-align: center; }
.officer .photo { aspect-ratio: 4 / 5; min-height: 0; margin-bottom: 18px; }
.officer h3 { font-size: 1.3rem; }
.officer .title {
  font-size: 0.72rem; font-weight: 700;
  letter-spacing: 0.2em; text-transform: uppercase;
  color: var(--gold);
}
.officer .year { font-size: 0.9rem; color: var(--gray); }

/* ---------- Info cards ---------- */
.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-top: 3px solid var(--gold);
  padding: 36px 32px;
}
.card h3 { margin-bottom: 12px; }
.card p { color: var(--gray); font-size: 0.98rem; margin-bottom: 18px; }
.card a.more {
  font-size: 0.78rem; font-weight: 700;
  letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--head); text-decoration: none;
  border-bottom: 2px solid var(--gold);
  padding-bottom: 3px;
}
.card a.more:hover { color: var(--gold); }

/* ---------- Contact blocks ---------- */
.contact-block { border-left: 3px solid var(--gold); padding-left: 24px; margin-bottom: 36px; }
.contact-block h3 { margin-bottom: 6px; }
.contact-block p { color: var(--gray); }
.contact-block a { color: var(--gold); font-weight: 600; text-decoration: none; }
.contact-block a:hover { text-decoration: underline; }

/* ---------- Gallery ---------- */
.gallery { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.gallery .photo { min-height: 0; aspect-ratio: 1; }
.gallery .wide { grid-column: span 2; aspect-ratio: auto; }
.gallery .tall { grid-row: span 2; aspect-ratio: auto; }

/* ---------- Forms ---------- */
.form { display: grid; gap: 18px; max-width: 540px; }
.form label {
  font-size: 0.72rem; font-weight: 700;
  letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--gray);
  display: block; margin-bottom: 6px;
}
.form input, .form textarea, .form select {
  width: 100%;
  font-family: var(--sans);
  font-size: 1rem;
  padding: 13px 16px;
  border: 1px solid var(--line);
  background: var(--bg-2);
  color: var(--ink);
}
.form input::placeholder, .form textarea::placeholder { color: rgba(159,169,180,0.6); }
.form input:focus, .form textarea:focus, .form select:focus {
  outline: 2px solid var(--gold); border-color: var(--gold);
}

/* ---------- CTA band ---------- */
.cta-band { background: var(--bg-2); color: var(--white); text-align: center; padding: 96px 24px; }
.cta-band h2 { color: var(--head); margin-bottom: 14px; font-weight: 500; }
.cta-band p { color: rgba(255,255,255,0.7); max-width: 54ch; margin: 0 auto 34px; }

/* ---------- Footer ---------- */
.footer { background: var(--bg-2); color: rgba(255,255,255,0.7); padding: 64px 0 32px; font-size: 0.95rem; border-top: 1px solid var(--line); }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 48px; }
.footer h4 {
  font-size: 0.72rem; letter-spacing: 0.2em; text-transform: uppercase;
  color: var(--gold); margin-bottom: 16px; font-weight: 700;
}
.footer ul { list-style: none; }
.footer li { margin-bottom: 10px; }
.footer a { color: rgba(255,255,255,0.7); text-decoration: none; }
.footer a:hover { color: var(--white); }
.footer .brand-letters { color: var(--head); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.12);
  padding-top: 24px;
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px;
  font-size: 0.75rem; letter-spacing: 0.1em; text-transform: uppercase;
  color: rgba(255,255,255,0.4);
}

/* ---------- Page hero (interior) ---------- */
.page-hero {
  background: var(--panel-2);
  background-image: linear-gradient(180deg, var(--panel-2) 0%, var(--bg-2) 100%);
  color: var(--white);
  text-align: center;
  padding: 84px 24px 72px;
  border-bottom: 3px solid var(--gold);
}
.page-hero .kicker { color: var(--gold); }
.page-hero h1 { color: var(--white); font-weight: 500; }
.page-hero .lede { color: rgba(255,255,255,0.72); margin: 16px auto 0; }

/* ---------- Map embed ---------- */
.map {
  width: 100%;
  min-height: 460px;
  border: 1px solid var(--line);
  border-top: 3px solid var(--gold);
  /* darken the light Google map so it blends into the dark theme */
  filter: invert(0.9) hue-rotate(180deg) brightness(0.95) contrast(0.9) grayscale(0.15);
  display: block;
}
.map.short { min-height: 320px; }

/* ---------- Scroll reveal ---------- */
.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.7s cubic-bezier(0.22, 0.61, 0.36, 1),
              transform 0.7s cubic-bezier(0.22, 0.61, 0.36, 1);
  will-change: opacity, transform;
}
.reveal.is-visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* ---------- Philanthropy ---------- */
.afsp-band {
  background: var(--panel-2);
  background-image: linear-gradient(180deg, var(--panel-2) 0%, var(--bg-2) 100%);
  color: var(--white);
  text-align: center;
  padding: 72px 24px;
}
.afsp-band h2 { color: var(--head); }
.afsp-band .kicker { color: var(--gold); }
.afsp-band p { color: rgba(255,255,255,0.78); max-width: 60ch; margin: 0 auto; }
.event-list { display: grid; gap: 0; margin-top: 8px; }
.event {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 24px;
  padding: 26px 0;
  border-bottom: 1px solid var(--line);
  align-items: baseline;
}
.event:first-child { border-top: 1px solid var(--line); }
.event .when {
  font-size: 0.72rem; font-weight: 700;
  letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--gold);
}
.event h3 { margin-bottom: 6px; }
.event p { color: var(--gray); font-size: 0.98rem; margin: 0; }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .grid-2 { grid-template-columns: 1fr; gap: 36px; }
  .grid-3 { grid-template-columns: 1fr 1fr; }
  .officers { grid-template-columns: 1fr 1fr; max-width: 560px; }
  .facts-inner { grid-template-columns: 1fr 1fr; }
  .fact:nth-child(3) { border-left: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .gallery { grid-template-columns: 1fr 1fr; }
  .gallery .wide { grid-column: span 2; aspect-ratio: 2 / 1; }
}

/* Collapse the nav to a hamburger before the 7 links get cramped */
@media (max-width: 840px) {
  .nav-links {
    display: none;
    position: absolute; top: 78px; left: 0; right: 0;
    background: var(--bg); border-bottom: 1px solid var(--line);
    flex-direction: column; align-items: stretch;
    padding: 12px 24px 20px; gap: 4px;
  }
  .nav-links.open { display: flex; }
  .nav-toggle { display: block; }
  /* full-width, comfortably tappable rows in the dropdown */
  .nav-links li { width: 100%; }
  .nav-links a { display: block; width: 100%; padding: 12px 0; }
  .nav-links .btn { width: 100%; text-align: center; margin-top: 8px; padding: 14px 20px; }
}

@media (max-width: 680px) {
  /* Keep the announcement bar to one tidy line on phones */
  .topbar { font-size: 0.6rem; letter-spacing: 0.08em; padding: 7px 14px; line-height: 1.5; }
  /* Tighter vertical rhythm so phones aren't all whitespace */
  .section { padding: 64px 0; }
  .section-head { margin-bottom: 34px; }
  .hero-content { padding: 68px 22px; }
  .creed { padding: 76px 22px; }
  .cta-band, .afsp-band { padding-top: 68px; padding-bottom: 68px; }
  .page-hero { padding: 60px 22px 52px; }
  .footer { padding-top: 52px; }
  .grid-3 { grid-template-columns: 1fr; }
  .officers { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .gallery { grid-template-columns: 1fr; }
  .gallery .wide { grid-column: span 1; aspect-ratio: 3 / 2; }
  .gallery .tall { grid-row: span 1; aspect-ratio: 3 / 4; }
  .hero { min-height: 70vh; }
  .event { grid-template-columns: 1fr; gap: 6px; }
  .map { min-height: 320px; }
}