/* ── Reset & Base ─────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --navy:   #0d1b2a;
  --blue:   #1b4f8a;
  --teal:   #1a8fa0;
  --accent: #e07b39;
  --light:  #f4f7fb;
  --white:  #ffffff;
  --text:   #2c3e50;
  --muted:  #6b7c93;
  --border: #dce3ec;
  --radius: 8px;
  --shadow: 0 2px 16px rgba(13,27,42,.10);
}

html { scroll-behavior: smooth; }

body {
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--text);
  background: var(--white);
}

a { color: var(--teal); text-decoration: none; }
a:hover { text-decoration: underline; }

h1, h2, h3, h4 { line-height: 1.25; font-weight: 700; }

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

/* ── Nav ──────────────────────────────────────────────── */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--navy);
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
  box-shadow: 0 2px 8px rgba(0,0,0,.25);
}

.nav-brand {
  color: var(--white);
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: .02em;
}

.nav-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

.nav-links a {
  color: rgba(255,255,255,.82);
  font-size: .9rem;
  font-weight: 500;
  transition: color .2s;
}

.nav-links a:hover { color: var(--white); text-decoration: none; }

/* ── Hero ─────────────────────────────────────────────── */
.hero {
  background: linear-gradient(135deg, #050d16 0%, #0e2545 55%, #0a4a58 100%);
  color: var(--white);
  padding: 6rem 2rem 5rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='60' height='60'%3E%3Ccircle cx='30' cy='30' r='1.5' fill='rgba(255,255,255,.08)'/%3E%3Ccircle cx='0' cy='0' r='1' fill='rgba(255,255,255,.05)'/%3E%3Ccircle cx='60' cy='60' r='1' fill='rgba(255,255,255,.05)'/%3E%3C/svg%3E") repeat;
  pointer-events: none;
}

.hero-content { position: relative; max-width: 800px; margin: 0 auto; }

.hero-tag {
  display: inline-block;
  background: rgba(255,255,255,.15);
  border: 1px solid rgba(255,255,255,.25);
  border-radius: 100px;
  padding: .3rem 1rem;
  font-size: .82rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  margin-bottom: 1.5rem;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  margin-bottom: 1rem;
  text-wrap: balance;
}

.hero-meta {
  font-size: 1.15rem;
  opacity: .88;
  margin-bottom: 2.5rem;
}

.hero-meta span { margin: 0 .5rem; opacity: .5; }

.hero-logos {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2rem;
  margin-bottom: 2rem;
}

.hero-logo {
  height: 68px;
  width: auto;
  filter: brightness(0) invert(1);
  opacity: .9;
}

.hero-logo--wide { height: 68px; }

.hero-buttons { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }

.btn {
  display: inline-block;
  padding: .65rem 1.5rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: .95rem;
  transition: opacity .2s, transform .15s;
  cursor: pointer;
}

.btn:hover { opacity: .88; transform: translateY(-1px); text-decoration: none; }

.btn-primary { background: var(--accent); color: var(--white); }
.btn-outline  { background: transparent; color: var(--white); border: 2px solid rgba(255,255,255,.6); }

/* ── Sections ─────────────────────────────────────────── */
section { padding: 5rem 2rem; }
section:nth-child(even):not(.hero) { background: var(--light); }

.container { max-width: 900px; margin: 0 auto; }
.container-wide { max-width: 1100px; margin: 0 auto; }

.section-title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  color: var(--navy);
  margin-bottom: .5rem;
}

.section-line {
  width: 48px;
  height: 4px;
  background: var(--teal);
  border-radius: 2px;
  margin-bottom: 2.5rem;
}

/* ── About ────────────────────────────────────────────── */
.about-body { font-size: 1.05rem; color: var(--text); }
.about-body p { margin-bottom: 1rem; }
.about-body ul { padding-left: 1.4rem; }
.about-body li { margin-bottom: .85rem; }

.info-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
  margin-top: 2.5rem;
}

.info-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  box-shadow: var(--shadow);
}

.info-card .label {
  font-size: .75rem;
  text-transform: uppercase;
  letter-spacing: .07em;
  color: var(--muted);
  margin-bottom: .3rem;
}

.info-card .value { font-weight: 700; color: var(--navy); font-size: 1rem; }

/* ── Schedule ─────────────────────────────────────────── */
.schedule-placeholder {
  background: var(--white);
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 3rem 2rem;
  text-align: center;
  color: var(--muted);
  font-size: 1rem;
}

.schedule-note {
  font-size: .9rem;
  color: var(--muted);
  margin-bottom: 2.5rem;
}

/* Weekly grid table */
.schedule-wrap { overflow-x: auto; }

.schedule-grid {
  width: 100%;
  border-collapse: collapse;
  font-size: .85rem;
  min-width: 680px;
}

.schedule-grid thead th {
  background: var(--navy);
  color: var(--white);
  padding: .6rem .75rem;
  text-align: center;
  font-weight: 700;
  font-size: .9rem;
}

.schedule-grid thead th small {
  display: block;
  font-weight: 400;
  opacity: .75;
  font-size: .78rem;
}

.schedule-grid thead th.sg-time { width: 56px; }

.schedule-grid td {
  border: 1px solid #d0d8e4;
  padding: .45rem .6rem;
  vertical-align: middle;
  text-align: center;
  line-height: 1.35;
}

.schedule-grid td.sg-time {
  background: var(--navy);
  color: rgba(255,255,255,.75);
  font-size: .78rem;
  font-weight: 600;
  white-space: nowrap;
  text-align: center;
  width: 56px;
}

/* Event type colours */
.ev-talk   { background: #d6ede4; color: #1a5c42; font-weight: 500; }
.ev-break  { background: #fef3cd; color: #856404; }
.ev-lunch  { background: #fff0b3; color: #7a5c00; }
.ev-work   { background: #ead5f5; color: #5a2d82; }
.ev-other  { background: #d0e8f5; color: #0d5273; }
.ev-empty  { background: #f8f9fa; }

.day-block { margin-bottom: 2.5rem; }

.day-header {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  margin-bottom: 1rem;
}

.day-header h3 { font-size: 1.15rem; color: var(--navy); }
.day-header .day-date { font-size: .9rem; color: var(--muted); }

.schedule-table {
  width: 100%;
  border-collapse: collapse;
  font-size: .95rem;
}

.schedule-table th {
  text-align: left;
  padding: .6rem 1rem;
  background: var(--navy);
  color: var(--white);
  font-weight: 600;
}

.schedule-table td {
  padding: .7rem 1rem;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

.schedule-table tr:last-child td { border-bottom: none; }
.schedule-table tr:hover td { background: rgba(26,143,160,.05); }

.schedule-table .time {
  white-space: nowrap;
  color: var(--teal);
  font-weight: 600;
  width: 110px;
}

.tag-talk   { display:inline-block; background:#e8f4f6; color:#1a8fa0; border-radius:4px; padding:.1rem .5rem; font-size:.78rem; font-weight:600; }
.tag-break  { display:inline-block; background:#fef3e8; color:#e07b39; border-radius:4px; padding:.1rem .5rem; font-size:.78rem; font-weight:600; }
.tag-social { display:inline-block; background:#eef2fb; color:#3b5fc0; border-radius:4px; padding:.1rem .5rem; font-size:.78rem; font-weight:600; }

/* ── Speakers ─────────────────────────────────────────── */
.speakers-grid {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.speaker-card {
  display: flex;
  flex-direction: column;
  gap: .75rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border);
}

.speaker-card:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.speaker-header {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.speaker-avatar {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  object-fit: cover;
  background: linear-gradient(135deg, var(--blue), var(--teal));
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: 1.1rem;
  font-weight: 700;
}

.speaker-info h3 { font-size: 1.05rem; color: var(--navy); margin-bottom: .1rem; }
.speaker-info h3 a { color: var(--navy); }
.speaker-info h3 a:hover { color: var(--teal); text-decoration: none; }
.speaker-info .affiliation { font-size: .87rem; color: var(--muted); }

.speaker-body {
  padding-left: calc(52px + 1rem);
  display: flex;
  flex-direction: column;
  gap: .6rem;
}

.talk-title {
  font-size: .97rem;
  font-weight: 500;
  font-style: italic;
  color: var(--text);
}

.abstract-toggle {
  align-self: flex-start;
  background: none;
  border: none;
  color: var(--teal);
  font-size: .87rem;
  cursor: pointer;
  padding: 0;
  font-weight: 600;
}

.abstract-toggle:hover { text-decoration: underline; }

.abstract-text {
  display: none;
  font-size: .97rem;
  color: var(--text);
  line-height: 1.75;
}

.abstract-text.open { display: block; }

/* ── Venue ────────────────────────────────────────────── */
.venue-map {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  margin-bottom: 2rem;
}

.venue-map img { width: 100%; height: auto; display: block; }

.venue-info h3 { font-size: 1.1rem; color: var(--navy); margin: 1.5rem 0 .5rem; }
.venue-info h3:first-child { margin-top: 0; }

.venue-info p, .venue-info li { font-size: .95rem; color: var(--text); margin-bottom: .4rem; }
.venue-info ul { padding-left: 1.2rem; }

.transport-icon { margin-right: .4rem; }

/* ── Funding ──────────────────────────────────────────── */
.funding-intro {
  font-size: 1.05rem;
  color: var(--text);
  margin-bottom: 2rem;
}

.funding-logos {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 2.5rem;
  margin-bottom: 2rem;
}

.funding-logos a { display: flex; align-items: center; }

.funding-logos img {
  height: 56px;
  width: auto;
  filter: grayscale(1);
  opacity: .75;
  transition: filter .2s, opacity .2s;
}

.funding-logos img:hover { filter: none; opacity: 1; }

.funding-text {
  font-size: .95rem;
  color: var(--muted);
  text-align: center;
}

/* ── Contact ──────────────────────────────────────────── */
.organizers-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}

.organizer-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  box-shadow: var(--shadow);
}

.organizer-name {
  font-weight: 700;
  color: var(--navy);
  margin-bottom: .35rem;
}

.organizer-email {
  font-size: .9rem;
  color: var(--teal);
  word-break: break-all;
}

.organizer-phone {
  display: flex;
  align-items: center;
  gap: .75rem;
  font-size: .95rem;
  color: var(--text);
}

.organizer-phone-label {
  font-size: .75rem;
  text-transform: uppercase;
  letter-spacing: .07em;
  color: var(--muted);
}

/* ── Footer ───────────────────────────────────────────── */
footer {
  background: var(--navy);
  color: rgba(255,255,255,.65);
  text-align: center;
  padding: 2.5rem 2rem 2rem;
  font-size: .88rem;
}

footer a { color: rgba(255,255,255,.75); }
footer a:hover { color: var(--white); }

.footer-logos {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2.5rem;
  margin-bottom: 1.5rem;
}

.footer-logo {
  height: 48px;
  width: auto;
  filter: brightness(0) invert(1);
  opacity: .85;
}

.footer-logo--wide { height: 48px; }

/* ── Hamburger button (hidden on desktop) ─────────────── */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px 4px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--white);
  border-radius: 2px;
  transition: transform .2s, opacity .2s;
}

/* ── Responsive ───────────────────────────────────────── */
@media (max-width: 640px) {
  nav {
    padding: 0 1rem;
    flex-wrap: wrap;
    height: auto;
    min-height: 60px;
    align-items: center;
  }

  .nav-toggle { display: flex; }

  .nav-links {
    display: none;
    flex-direction: column;
    gap: 0;
    width: 100%;
    padding: .25rem 0 .75rem;
    order: 3;
  }

  .nav-links.nav-open { display: flex; }

  .nav-links a {
    display: block;
    padding: .65rem 0;
    font-size: .95rem;
    border-bottom: 1px solid rgba(255,255,255,.1);
  }

  section { padding: 3.5rem 1.25rem; }
  .hero { padding: 4rem 1.25rem 3.5rem; }
}