/* ============================================
   2026 NECCT Conference — style.css
   ============================================ */

:root {
  --paper: #f8f5ee;
  --paper-alt: #f1ece0;
  --ink: #2a2724;
  --ink-soft: #5c564d;
  --rule: #ddd5c4;
  --vermillion: #a4402c;
  --vermillion-dark: #832f1f;
  --serif: "Noto Serif", Georgia, "Times New Roman", serif;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --max: 980px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
  font-family: var(--serif);
  font-weight: 700;
  color: var(--ink);
  margin: 0 0 .4em;
}

a { color: inherit; }

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

/* ---------- Header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(248, 245, 238, 0.92);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--rule);
}

.header-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: .04em;
  text-decoration: none;
  color: var(--ink);
}

.brand span { color: var(--vermillion); }

.site-nav {
  display: flex;
  gap: 28px;
}

.site-nav a {
  text-decoration: none;
  font-size: .92rem;
  font-weight: 500;
  color: var(--ink-soft);
  letter-spacing: .02em;
  transition: color .15s ease;
}

.site-nav a:hover { color: var(--vermillion); }

/* ---------- Hero ---------- */

.hero {
  padding: 72px 24px 56px;
}

.hero-inner {
  max-width: var(--max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 56px;
  align-items: center;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: .14em;
  font-size: .78rem;
  font-weight: 600;
  color: var(--vermillion);
  margin: 0 0 14px;
}

.hero-text h1 {
  font-size: clamp(2.2rem, 4vw, 3.1rem);
  line-height: 1.12;
  margin-bottom: .35em;
}

.hero-dates {
  font-family: var(--serif);
  font-size: 1.3rem;
  color: var(--ink);
  margin: 0 0 .25em;
}

.hero-location {
  color: var(--ink-soft);
  margin: 0 0 28px;
  font-size: 1.02rem;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 12px 24px;
  border-radius: 3px;
  text-decoration: none;
  font-weight: 600;
  font-size: .92rem;
  letter-spacing: .02em;
  transition: all .15s ease;
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--vermillion);
  color: #fff;
}
.btn-primary:hover { background: var(--vermillion-dark); }

.btn-ghost {
  border-color: var(--ink);
  color: var(--ink);
}
.btn-ghost:hover { background: var(--ink); color: var(--paper); }

.hero-art {
  border-radius: 2px;
  overflow: hidden;
  box-shadow: 0 18px 44px -18px rgba(42, 39, 36, 0.35);
  border: 1px solid var(--rule);
}

.hero-art img {
  width: 100%;
  height: auto;
  display: block;
}

/* ---------- Info strip ---------- */

.info-strip {
  background: var(--ink);
  color: var(--paper);
}

.info-strip-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 22px 24px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.info-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  text-align: center;
}

.info-label {
  text-transform: uppercase;
  letter-spacing: .12em;
  font-size: .68rem;
  color: #c9a08f;
  font-weight: 600;
}

.info-value {
  font-family: var(--serif);
  font-size: 1rem;
}

/* ---------- Program sections ---------- */

.program {
  padding: 64px 24px 72px;
}

.program-heading {
  max-width: var(--max);
  margin: 0 auto 32px;
  font-size: clamp(1.6rem, 2.6vw, 2rem);
  text-align: center;
}

.program-columns {
  max-width: var(--max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0 56px;
}

.day-column {
  padding-bottom: 8px;
}

.day-column#saturday {
  border-left: 1px solid var(--rule);
  padding-left: 56px;
}

.program-inner {
  max-width: var(--max);
  margin: 0 auto;
}

.day-title {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 28px;
  padding-bottom: 16px;
  border-bottom: 2px solid var(--vermillion);
  font-weight: 700;
}

.day-name {
  font-size: clamp(1.8rem, 3vw, 2.4rem);
}

.day-date {
  font-family: var(--sans);
  font-size: 1rem;
  color: var(--ink-soft);
  font-weight: 500;
}

.schedule {
  list-style: none;
  margin: 0;
  padding: 0;
}

.event {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding: 16px 0;
  border-bottom: 1px solid var(--rule);
}

.event:last-child { border-bottom: none; }

.event-time {
  font-family: var(--serif);
  font-weight: 600;
  color: var(--vermillion);
  font-size: .82rem;
  letter-spacing: .01em;
}

.event-body h3 {
  font-size: 1.08rem;
  margin-bottom: .1em;
}

.event-break .event-body h3,
.event-meal .event-body h3 {
  font-family: var(--sans);
  font-weight: 600;
  color: var(--ink-soft);
  font-style: italic;
}

.event-break, .event-meal, .event-closing { opacity: .82; }

.talks {
  list-style: none;
  margin: 10px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.talks li {
  list-style: none;
}

.talks details summary {
  display: flex;
  flex-direction: column;
  gap: 2px;
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 26px;
}

.talks details summary::-webkit-details-marker {
  display: none;
}

.talks details summary::after {
  content: "+";
  position: absolute;
  top: 0;
  right: 0;
  font-family: var(--serif);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--vermillion);
  line-height: 1.3;
  transition: transform .15s ease;
}

.talks details[open] summary::after {
  content: "\2212";
}

.talks details summary:hover .talk-title {
  color: var(--vermillion-dark);
}

.abstract {
  margin: 12px 0 2px;
  padding: 14px 16px;
  background: rgba(164, 64, 44, 0.045);
  border-left: 2px solid var(--vermillion);
  border-radius: 2px;
  font-size: .92rem;
  line-height: 1.7;
  color: var(--ink);
}

.abstract p {
  margin: 0 0 .85em;
}

.abstract p:last-child {
  margin-bottom: 0;
}

.talk-title {
  font-size: .98rem;
}

.talk-speaker {
  font-size: .88rem;
  color: var(--ink-soft);
}

.talk-speaker::before {
  content: "— ";
}

.talk-speaker a {
  color: var(--vermillion-dark);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid rgba(131, 47, 31, 0.35);
}

.talk-speaker a:hover {
  border-bottom-color: var(--vermillion-dark);
}

.event-keynote {
  background: rgba(164, 64, 44, 0.06);
  border-radius: 4px;
  padding: 24px;
  border-bottom: none;
  margin-top: 8px;
}

.event-keynote .event-time { color: var(--vermillion-dark); }
.event-keynote h3 { font-size: 1.25rem; }
.event-keynote .talk-title { font-size: 1.05rem; font-weight: 500; }

/* ---------- Sponsors ---------- */

.sponsors {
  padding: 64px 24px;
  text-align: center;
}

.sponsors-inner { max-width: 640px; margin: 0 auto; }

.sponsors-inner .eyebrow {
  display: block;
  text-align: center;
}

.sponsors p {
  color: var(--ink-soft);
  font-size: 1.05rem;
  margin-bottom: 0;
}

/* ---------- Footer ---------- */

.site-footer {
  background: var(--ink);
  color: #b7b0a5;
  padding: 28px 24px;
  text-align: center;
  font-size: .85rem;
}

/* ---------- Responsive ---------- */

@media (max-width: 900px) {
  .program-columns {
    grid-template-columns: 1fr;
    gap: 0;
  }
  .day-column#saturday {
    border-left: none;
    padding-left: 0;
    margin-top: 48px;
    padding-top: 40px;
    border-top: 1px solid var(--rule);
  }
}

@media (max-width: 780px) {
  .hero-inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .hero-art { max-width: 340px; margin: 0 auto; order: -1; }
  .info-strip-inner { grid-template-columns: repeat(2, 1fr); }
  .event-time { font-size: .8rem; }
  .site-nav { gap: 16px; }
  .site-nav a { font-size: .82rem; }
}

@media (max-width: 480px) {
  .hero { padding: 48px 18px 40px; }
  .header-inner { padding: 14px 18px; }
}