:root{
  --brick: #B94700;
  --honey: #F0B323;
  --blue:  #009CDE;
  --gray:  #898D8D;
  --light: #E9EAEA;
  --ink:   #0C0C0C;
  --paper: #FFFFFF;
}

/* Dark theme variables */
[data-theme="dark"]{
  --brick: #D16A2B;
  --honey: #F6C24F;
  --blue:  #00a2ff;
  --gray:  #028989;
  --light: #2A2D2D;
  --ink:   #ffffff;
  --paper: #08090a;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body{
  margin:0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  font-size: 19px;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.5;
}

a { color: var(--blue); text-decoration: none; }

/* Header */
header{
  position: sticky; top:0; z-index: 50;
  background: #fff; color:#111;
  border-bottom: 1px solid var(--light);
}
[data-theme="dark"] header{ background:#1d1717; color:#ffffff; border-bottom-color:#000000; }
.nav{ max-width: 1100px; margin: 0 auto; display:flex; align-items:center; gap:20px; padding:14px 20px; }
.logo{ font-weight: 900; letter-spacing: .2px; font-size: 1.02rem; display:flex; align-items:center; gap:.6rem; color:#fff; }
.nav a{ color: #111; text-decoration: none; font-weight: 600; }
[data-theme="dark"] .nav a{ color: rgba(255,255,255,.92); }
.spacer{ flex:1 }
.nav .links{ display:flex; gap:16px; flex-wrap: wrap; align-items:center; }
.btn{ appearance: none; border: 2px solid var(--brick); background: var(--brick); color:#fff; padding:10px 14px; border-radius: 999px; font-weight:800; cursor:pointer; }
.btn:hover{ filter: brightness(.95); }
.btn.secondary{ background: transparent; border-color: var(--brick); color: var(--brick); }
.btn.secondary:hover{ background: rgba(185,71,0,.08); }
[data-theme="dark"] .btn.secondary:hover{ background: rgba(198, 93, 27, 0.1); }

.iconbtn{ border:0; background: transparent; font-size: 1.05rem; cursor: pointer; padding: 6px 8px; line-height: 1; border-radius: 8px; }
.iconbtn:hover{ background: rgba(0,0,0,.06); }
[data-theme="dark"] .iconbtn:hover{ background: rgba(255,255,255,.08); }
.btn:focus{ outline: 3px solid color-mix(in srgb, var(--honey) 45%, transparent); outline-offset: 2px; }

/* Hero */
.hero{ background: var(--paper); border-bottom: 1px solid var(--light); }
.hero-inner{ max-width:1100px; margin:0 auto; padding:64px 20px 40px; display:grid; grid-template-columns: 1.1fr .9fr; gap: 32px; align-items:center; }
h1{ font-size: clamp(2rem, 3.6vw, 3rem); line-height: 1.1; margin: 0; }
.tag{ display:inline-flex; gap:.5rem; align-items:center; background: var(--honey); color:#231f00; border-radius:999px; padding:6px 10px; font-weight:900; letter-spacing:.3px; text-transform: uppercase; font-size:.75rem; }
.hero .meta{ margin-top: 14px; color: #404349; font-weight:650; }
[data-theme="dark"] .hero .meta{ color: #0bff03; }
.hero .cta{ display:flex; gap:12px; margin-top: 18px; flex-wrap: wrap; }
.hero-card{ background: #fff; border:1px solid var(--light); border-radius: 18px; padding:18px; box-shadow: 0 8px 24px rgba(0,0,0,.06); }
.hero-card h3{ margin:.2rem 0 .4rem; }
.hero-logos{ display:flex; align-items:center; gap:16px; margin: 0 0 10px; }
.hero-logos img{ height:60px; width:auto; display:block; }
/* Dark: card surfaces */
[data-theme="dark"] .hero-card{ background:#161718; border-color:#2A2D2D; box-shadow:none; }

/* Sections */
section{ scroll-margin-top: 88px; }
.container{ max-width:1100px; margin:0 auto; padding: 44px 20px; }
.eyebrow{ text-transform: uppercase; letter-spacing: .18em; font-weight: 900; color: var(--brick); font-size: .78rem; }
h2{ font-size: clamp(1.6rem, 2.6vw, 2.2rem); margin:.35rem 0 1rem; }

/* Calendar */
.filterbar{ display:flex; gap: 12px; align-items:center; flex-wrap: wrap; }
.input{ border:1px solid var(--light); padding:10px 12px; border-radius: 12px; min-width: 220px; }
[data-theme="dark"] .input{ background:#121314; color:#e6e7e8; border-color:#2A2D2D; }
.tabs{ display:inline-flex; background: #F7F7F7; padding: 4px; border-radius: 12px; border:1px solid var(--light); }
[data-theme="dark"] .tabs{ background:#161718; border-color:#2A2D2D; }
.tab{ border:0; background: transparent; padding:8px 12px; border-radius: 10px; font-weight: 800; cursor:pointer; }
.tab[aria-selected="true"]{ background: #fff; border:1px solid var(--light); }
[data-theme="dark"] .tab[aria-selected="true"]{ background:#121314; border-color:#2A2D2D; color:#e6e7e8; }

.monthbar{ display:flex; align-items:center; gap:10px; margin-top: 12px; }
.chip{ border:1px solid var(--light); padding:8px 12px; border-radius: 999px; font-weight:800; background:#fff; }
[data-theme="dark"] .chip{ background:#121314; border-color:#2A2D2D; color:#e6e7e8; }
.arrow{ width:36px; height:36px; border-radius:10px; border:1px solid var(--light); background:#fff; display:grid; place-items:center; cursor:pointer; }
[data-theme="dark"] .arrow{ background:#121314; border-color:#2A2D2D; color:#e6e7e8; }

.list{ margin-top: 20px; }
.month{ border-top:2px solid #E2E2E2; padding-top: 12px; margin-top: 30px; }
[data-theme="dark"] .month{ border-top-color:#2A2D2D; }

/* Events */
.event{ display:grid; grid-template-columns: 110px 1fr; gap:14px; padding:14px 10px; border-radius:14px; border:1px solid var(--light); background: #fff; margin: 10px 0; align-items: start; }
[data-theme="dark"] .event{ background:#161718; border-color:#2A2D2D; }
.event .date{
  position: relative;
  display:grid;
  place-items:center;
  text-align:center;
  font-weight:900;
  color:#fff;
  background: linear-gradient(180deg, #8F2D00 0%, var(--brick) 60%, var(--honey) 160%); /* fallback when no photo */
  border-radius: 12px;
  padding: 10px 8px;
  overflow: hidden;
}
.event .date .dow{ font-size:.78rem; opacity:.9; }
.event .date .day{ font-size:1.9rem; line-height:1; }

/* Photos */
.date-photo{
  position:absolute; inset:0;
  width:100%; height:100%;
  object-fit: cover;
  display:block;
}
.date.has-photo::after{
  content:"";
  position:absolute; inset:0;
  background: linear-gradient(145deg, rgba(0,0,0,.30), rgba(0,0,0,.10) 55%, rgba(0,0,0,0));
}
.date-overlay{ position: relative; z-index: 1; transition: opacity .18s ease, transform .18s ease; }
.date:hover .date-overlay{ opacity:0; transform: translateY(-2px); }

.event h4{ margin: 0; color: #111; }
[data-theme="dark"] .event h4{ color:#fff; }
.event .meta{ color: #4b4f56; font-weight:600; margin: 4px 0; }
[data-theme="dark"] .event .meta{ color:#c6c8cc; }
.event .tags{ display:flex; gap:8px; flex-wrap:wrap; }
.pill{ font-size:.75rem; font-weight:900; padding:4px 8px; border-radius:999px; border:1px solid var(--light); background: #FAFAFA; }
[data-theme="dark"] .pill{ background:#1b1d1e; border-color:#2A2D2D; color:#e6e7e8; }
.event .actions{ margin-top: 6px; display:flex; gap:8px; }

/* Calendar grid */
.calgrid{ margin-top: 16px; border:1px solid var(--light); border-radius: 14px; overflow:hidden; }
.calgrid .head, .calgrid .row{ display:grid; grid-template-columns: repeat(7, 1fr); }
.calgrid .head div{ background: #F7F7F7; padding:10px; font-weight:900; text-transform:uppercase; letter-spacing:.06em; font-size:.8rem; }
[data-theme="dark"] .calgrid{ border-color:#2A2D2D; }
[data-theme="dark"] .calgrid .head div{ background:#161718; color:#e6e7e8; }
.cell{ min-height: 92px; border-top:1px solid var(--light); border-right:1px solid var(--light); padding:8px; position:relative; }
.cell:nth-child(7n){ border-right:0; }
.cell .d{ position:absolute; top:6px; right:8px; font-weight:800; font-size:.85rem; color: #6a6e73; }
[data-theme="dark"] .cell{ border-color:#2A2D2D; }
[data-theme="dark"] .cell .d{ color:#9aa0a6; }
.chip-event{ display:block; width:100%; text-align:left; margin-top: 24px; border-left: 4px solid var(--brick); padding:6px 8px; background: #B94700; border-radius: 10px; box-shadow: 0 1px 0 rgba(0,0,0,.03); font-weight:800; font-size:.86rem; color:#fff; cursor: pointer; }
.chip-event:hover{ filter: brightness(.95); }

/* Today highlight */
.cell.today{ outline: 2px solid var(--blue); outline-offset: -2px; background: #F3F9FF; }

/* Next talk bar */
.nextbar{ margin: 10px 0 6px; }
.nextbar .event{ margin-top: 8px; }

/* About */
.about p{ max-width: 70ch; }
.organizers{ display:grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; margin-top: 18px; }
.card{ background:#fff; border:1px solid var(--light); border-radius: 16px; padding: 16px; }
[data-theme="dark"] .card{ background:#161718; border-color:#2A2D2D; }

.org-list{ display:grid; grid-template-columns: 1fr; gap: 10px; }
.org{ display:flex; align-items:center; gap: 10px; }
.avatar{ width: 52px; height: 52px; border-radius: 50%; object-fit: cover; border: 2px solid var(--light); background:#f2f2f2; font-size:0; }
.avatar-lg{ width: 72px; height: 72px; border-radius: 50%; object-fit: cover; border: 2px solid var(--light); background:#f2f2f2; font-size:0; }
.org-card-head{ display:flex; align-items:center; gap: 12px; }
.org-name{ font-weight: 900; }
.org-email{ color:#5b5f64; font-size:.92rem; }

footer{ margin-top: 40px; border-top:1px solid var(--light); }
footer .container{ display:flex; align-items:center; justify-content: space-between; gap: 10px; padding-top: 22px; padding-bottom: 22px; color: #5b5f64; font-size: .9rem; }
[data-theme="dark"] footer .container{ color:#aeb3b8; }

@media (max-width: 880px){
  .hero-inner{ grid-template-columns: 1fr; }
}

/* Hide weekends and widen Tuesday */
.calgrid.hide-weekends .head div:nth-child(6),
.calgrid.hide-weekends .head div:nth-child(7){ display:none; }
.calgrid.hide-weekends .row .cell:nth-child(6n){ border-right:0; }

/* Reflow cells into 5 columns (Mon-Fri) */
.calgrid.hide-weekends .head, .calgrid.hide-weekends .row{ grid-template-columns: 1.2fr 2fr 1.2fr 1.2fr 1.2fr 0 0; }

/* Modal styles */
.modal{ position: fixed; inset: 0; background: rgba(0,0,0,.45); display:none; align-items: center; justify-content: center; padding: 20px; z-index: 100; }
.modal.open{ display:flex; }
.modal-dialog{ background: #fff; border-radius: 14px; border:1px solid var(--light); padding: 16px; max-width: 560px; width: 100%; position: relative; }
[data-theme="dark"] .modal-dialog{ background:#161718; border-color:#2A2D2D; color:#e6e7e8; }
.modal-close{ position: absolute; top: 8px; right: 8px; border:0; background: transparent; font-size: 1.1rem; cursor: pointer; }
.modal-photo{ width: 100%; height: 180px; object-fit: cover; border-radius: 10px; margin-bottom: 10px; }
.modal-title{ margin: 6px 0; }
.modal-meta{ color:#4b4f56; font-weight:600; display:grid; gap:4px; margin-bottom: 8px; }
.modal-actions{ display:flex; gap:8px; margin-top: 10px; flex-wrap: wrap; }