:root {
  --bg: #07111d;
  --bg-soft: #0d1b2a;
  --panel: rgba(16, 32, 49, 0.88);
  --panel-strong: #12263a;
  --text: #f3f5f8;
  --muted: #b8c1cb;
  --line: rgba(255, 255, 255, 0.12);
  --gold: #d7b16d;
  --gold-strong: #e0bf83;
  --shadow: 0 18px 60px rgba(0, 0, 0, 0.28);
  --max-width: 1180px;
}

body.light-mode {
  --bg: #f3f4f6;
  --bg-soft: #ffffff;
  --panel: rgba(255,255,255,0.92);
  --panel-strong: #ffffff;
  --text: #142130;
  --muted: #5c6773;
  --line: rgba(20, 33, 48, 0.12);
  --gold: #b78a3f;
  --gold-strong: #8e692f;
  --shadow: 0 18px 44px rgba(30, 41, 59, 0.10);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: 'Inter', sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button, input, select, textarea { font: inherit; }

.container {
  width: min(calc(100% - 2rem), var(--max-width));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(14px);
  background: rgba(7, 17, 29, 0.78);
  border-bottom: 1px solid var(--line);
}
body.light-mode .site-header { background: rgba(255,255,255,0.88); }

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 78px;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  min-width: 0;
}

.brand-mark {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  font-weight: 700;
  background: linear-gradient(135deg, #1d4f7a, #d79a2d);
  color: #fff;
  flex-shrink: 0;
}

.brand-logo {
  height: 56px;
  width: auto;
  object-fit: contain;
  flex-shrink: 0;
}

.brand-title,
.brand-subtitle { display: block; }
.brand-title {
  font-family: 'Cormorant Garamond', serif;
  font-size: 1.65rem;
  font-weight: 700;
  line-height: 1;
}
.brand-subtitle {
  font-size: 0.82rem;
  color: var(--muted);
  margin-top: 0.15rem;
}

.site-nav {
  display: flex;
  gap: 1.2rem;
  align-items: center;
}
.site-nav a {
  color: var(--muted);
  font-weight: 500;
}
.site-nav a:hover { color: var(--text); }

.nav-toggle,
.theme-toggle {
  border: 1px solid var(--line);
  background: transparent;
  color: var(--text);
  border-radius: 12px;
  padding: 0.65rem 0.9rem;
  cursor: pointer;
}
.nav-toggle { display: none; }

.hero {
  position: relative;
  min-height: 92vh;
  display: flex;
  align-items: center;
  background:
    linear-gradient(rgba(6, 14, 24, 0.62), rgba(6, 14, 24, 0.82)),
    url('images/hero-andes.jpg') center/cover no-repeat;
}
body.light-mode .hero {
  background:
    linear-gradient(rgba(255, 255, 255, 0.40), rgba(243, 244, 246, 0.88)),
    url('images/hero-andes.jpg') center/cover no-repeat;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at top left, rgba(215,177,109,0.18), transparent 36%);
}
.hero-content {
  position: relative;
  padding: 7rem 0 5rem;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  border: 1px solid rgba(255,255,255,0.16);
  background: rgba(255,255,255,0.05);
  padding: 0.6rem 1rem;
  border-radius: 999px;
  font-size: 0.94rem;
  color: var(--text);
}
.hero h1 {
  font-family: 'Cormorant Garamond', serif;
  font-size: clamp(3.2rem, 7vw, 6rem);
  line-height: 0.95;
  margin: 1rem 0 1rem;
  max-width: 11ch;
}
.hero-lead {
  font-size: clamp(1.05rem, 2vw, 1.35rem);
  color: var(--muted);
  max-width: 760px;
}
.hero-actions {
  display: flex;
  gap: 1rem;
  margin: 2rem 0;
  flex-wrap: wrap;
}
.hero-meta {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 2rem;
}
.hero-meta div {
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 1rem 1.1rem;
}
.hero-meta strong {
  display: block;
  margin-bottom: 0.2rem;
  color: var(--gold-strong);
}
.hero-meta span { color: var(--muted); }

.section {
  padding: 6rem 0;
}
.section-alt {
  background: linear-gradient(180deg, transparent, rgba(255,255,255,0.02), transparent);
}
body.light-mode .section-alt {
  background: linear-gradient(180deg, rgba(20,33,48,0.02), rgba(20,33,48,0.04), rgba(20,33,48,0.02));
}

.section-heading {
  max-width: 780px;
  margin: 0 auto 2.5rem;
  text-align: center;
}
.section-heading.left-aligned {
  margin-left: 0;
  text-align: left;
}
.eyebrow {
  display: inline-block;
  color: var(--gold);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.82rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}
.section-heading h2 {
  font-family: 'Cormorant Garamond', serif;
  font-size: clamp(2.3rem, 4vw, 3.6rem);
  line-height: 1;
  margin: 0 0 0.8rem;
}
.section-heading p {
  color: var(--muted);
  margin: 0;
}

.topics-grid,
.speakers-grid,
.venue-grid,
.organizers-grid,
.three-col-layout {
  display: grid;
  gap: 1.25rem;
}
.topics-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.speakers-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.venue-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.organizers-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.three-col-layout { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.topic-card,
.speaker-card,
.venue-card,
.organizer-card,
.info-card,
.schedule-box,
.registration-form {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 24px;
  box-shadow: var(--shadow);
}
.topic-card {
  padding: 1.4rem;
  font-weight: 600;
  text-align: center;
}
.speaker-card,
.venue-card,
.organizer-card,
.info-card {
  padding: 1.5rem;
}
.speaker-card h3,
.venue-card h3,
.organizer-card h3,
.info-card h3,
.schedule-day h3 {
  font-family: 'Cormorant Garamond', serif;
  font-size: 1.75rem;
  margin: 0 0 0.35rem;
}
.speaker-card p,
.venue-card p,
.organizer-card p,
.info-card p,
.schedule-day p,
.info-card ol {
  color: var(--muted);
  margin: 0;
}
.info-card ol {
  padding-left: 1.25rem;
}

.two-col-layout,
.form-layout {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 2rem;
  align-items: start;
}
.schedule-box {
  padding: 1.3rem;
}
.schedule-day {
  padding: 1rem 0.5rem;
  border-bottom: 1px solid var(--line);
}
.schedule-day:last-child { border-bottom: 0; }

.registration-form {
  padding: 1.5rem;
}
.form-row { margin-bottom: 1rem; }
.form-row label,
.form-row legend {
  display: block;
  margin-bottom: 0.45rem;
  font-weight: 600;
}
.two-up {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}
input,
select,
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 0.95rem 1rem;
  background: rgba(255,255,255,0.03);
  color: var(--text);
}
body.light-mode input,
body.light-mode select,
body.light-mode textarea {
  background: rgba(20,33,48,0.03);
}
textarea { resize: vertical; }
.radio-group {
  border: 0;
  padding: 0;
}
.radio-group label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-right: 1rem;
  font-weight: 500;
}
.radio-group input {
  width: auto;
}
.form-status {
  min-height: 1.5rem;
  margin: 0.9rem 0 0;
  color: var(--muted);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  border-radius: 999px;
  padding: 0.95rem 1.35rem;
  font-weight: 700;
  border: 1px solid transparent;
  transition: transform 0.18s ease, opacity 0.18s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary {
  background: var(--gold);
  color: #10151c;
}
.btn-secondary {
  border-color: var(--line);
  background: transparent;
  color: var(--text);
}
.btn-full { width: 100%; }

.site-footer {
  border-top: 1px solid var(--line);
  padding: 2rem 0 3rem;
}
.footer-content {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}
.footer-note,
.site-footer p { color: var(--muted); }
.site-footer h3 {
  font-family: 'Cormorant Garamond', serif;
  font-size: 2rem;
  margin: 0 0 0.5rem;
}

@media (max-width: 1000px) {
  .speakers-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .topics-grid,
  .organizers-grid,
  .three-col-layout,
  .venue-grid,
  .two-col-layout,
  .form-layout,
  .hero-meta { grid-template-columns: 1fr; }
}

@media (max-width: 760px) {
  .nav-toggle { display: inline-flex; }
  .site-nav {
    position: absolute;
    top: calc(100% + 1px);
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 1rem;
    background: var(--bg-soft);
    border-bottom: 1px solid var(--line);
  }
  .site-nav.open { display: flex; }
  .site-nav a {
    padding: 0.7rem 0;
    border-bottom: 1px solid var(--line);
  }
  .site-nav a:last-child { border-bottom: 0; }
  .brand-title { font-size: 1.3rem; }
  .hero { min-height: auto; }
  .hero-content { padding: 6rem 0 4rem; }
  .hero h1 { max-width: 12ch; }
  .two-up,
  .speakers-grid { grid-template-columns: 1fr; }
  .section { padding: 4.2rem 0; }
}

/* ===== Fix dropdown contrast ===== */

select {
  background-color: #1e2a38;
  color: #ffffff;
  border: 1px solid #3a4a5a;
}

select option {
  background-color: #ffffff;
  color: #000000;
}

/* ===== Venue map improvements ===== */

.venue-card iframe {
  margin-top: 12px;
  border-radius: 14px;
  width: 100%;
  height: 220px;
}

.venue-card {
  transition: transform 0.2s ease, filter 0.2s ease;
}

.venue-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 24px 70px rgba(0,0,0,0.35);
}

/* ===== Supported By section ===== */

.supported-logos {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  grid-template-rows: auto auto;
  gap: 2rem 1.5rem;
  align-items: start;
}

.supporter-item {
  display: grid;
  grid-template-rows: 170px auto; /* fixed logo row + text row */
  justify-items: center;
  align-items: end;
  gap: 1rem;
}

.supporter-logo {
  display: block;
  margin: 0 auto;
  width: auto;
  max-width: 100%;
  height: 110px;
  object-fit: contain;
  object-position: center;
  align-self: end;
  transition: none; /* remove hover scaling artifact */
  image-rendering: auto;
}

.supporter-logo-cmm {
  height: 110px;
}

.supporter-logo-puc {
  height: 105px;
}

.supporter-logo-utfsm {
  height: 95px;
}

.supporter-logo-anid-wide {
  height: 165px; /* slightly bigger */
}

.supporter-logo:hover {
  transform: none;
}

.supporter-item p {
  text-align: center;
  color: var(--muted);
  font-size: 0.9rem;
  max-width: 220px;
  margin: 0;
  min-height: 5.5em; /* keeps descriptions aligned */
}

.supporter-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;

  height: 110px;

  font-family: 'Cormorant Garamond', serif;
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: 0.05em;

  color: var(--text);
}

.supporter-item:last-child {
  grid-column: 2 / span 2;
  grid-row: 2;
  margin-top: -15px;
}

@media (max-width: 1100px) {
  .supported-logos {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .supporter-item:last-child {
    grid-column: auto;
  }
}

@media (max-width: 640px) {
  .supported-logos {
    grid-template-columns: 1fr;
  }

  .supporter-item {
    grid-template-rows: 130px auto;
  }

  .supporter-logo-cmm {
    height: 80px;
  }

  .supporter-logo-puc {
    height: 76px;
  }

  .supporter-logo-utfsm {
    height: 70px;
  }

  .supporter-logo-anid-wide {
    height: 120px;
  }

  .supporter-item p {
    min-height: auto;
  }

  .supporter-placeholder {
    height: 90px;
    min-width: 0;
    width: 100%;
    max-width: 240px;
    font-size: 1.1rem;
  }
}

.supporters-section {
  background: #f3f4f6;
  border-top: 1px solid rgba(20, 33, 48, 0.12);
  border-bottom: 1px solid rgba(20, 33, 48, 0.12);
}

.supporters-section .section-heading h2 {
  color: #142130;
}

.supporters-section .supporter-item p,
.supporters-section .supporter-placeholder {
  color: #5c6773;
}