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

:root {
  --navy:   #0d1f3c;
  --blue:   #1a56db;
  --accent: #4f8ef7;
  --light:  #f4f7fb;
  --gray:   #6b7280;
  --text:   #1e293b;
  --white:  #ffffff;
  --border: #e2e8f0;
  --card-shadow: 0 2px 12px rgba(13,31,60,.08);
}

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);
}

/* ── NAV ── */
nav {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--navy);
  box-shadow: 0 2px 8px rgba(0,0,0,.25);
}

.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  height: 56px;
}

.nav-brand {
  color: var(--white);
  font-weight: 700;
  font-size: 1.05rem;
  text-decoration: none;
  letter-spacing: .3px;
}

.nav-links { display: flex; gap: .25rem; list-style: none; }

.nav-links a {
  color: rgba(255,255,255,.82);
  text-decoration: none;
  padding: .45rem .75rem;
  border-radius: 5px;
  font-size: .9rem;
  transition: background .18s, color .18s;
}

.nav-links a:hover { background: rgba(255,255,255,.12); color: var(--white); }

/* hamburger (mobile) */
.nav-toggle { display: none; cursor: pointer; background: none; border: none; }
.nav-toggle span {
  display: block; width: 22px; height: 2px;
  background: var(--white); margin: 5px 0; transition: .3s;
}

/* ── HERO ── */
.hero {
  position: relative;
  height: 420px;
  display: flex;
  align-items: flex-end;
  overflow: hidden;
}

.hero-img {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
  object-position: center 60%;
  filter: brightness(.55);
}

.hero-content {
  position: relative;
  max-width: 1100px;
  margin: 0 auto;
  width: 100%;
  padding: 0 1.5rem 2.5rem;
  color: var(--white);
}

.hero-badge {
  display: inline-block;
  background: var(--blue);
  color: var(--white);
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .8px;
  text-transform: uppercase;
  padding: .3rem .8rem;
  border-radius: 4px;
  margin-bottom: .8rem;
}

.hero h1 {
  font-size: clamp(1.6rem, 3.5vw, 2.5rem);
  font-weight: 800;
  line-height: 1.2;
  text-shadow: 0 2px 8px rgba(0,0,0,.4);
}

.hero-sub {
  margin-top: .6rem;
  font-size: 1.05rem;
  opacity: .9;
}

/* ── SECTIONS ── */
section { padding: 5rem 1.5rem; }
section:nth-child(even) { background: var(--light); }

.section-inner { max-width: 1100px; margin: 0 auto; }

.section-title {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--navy);
  margin-bottom: .5rem;
}

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

.section-lead {
  font-size: 1.05rem;
  color: var(--gray);
  max-width: 780px;
  margin-bottom: 2rem;
}

/* ── ABOUT ── */
.about-text p { margin-bottom: 1.1rem; max-width: 860px; }

/* ── TOPICS ── */
.topics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.topic-card {
  background: var(--white);
  border-radius: 10px;
  padding: 1.75rem;
  box-shadow: var(--card-shadow);
  border-top: 4px solid var(--blue);
}

.topic-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 1rem;
}

.topic-card ul {
  list-style: none;
  padding: 0;
}

.topic-card ul li {
  padding: .35rem 0;
  padding-left: 1.4rem;
  position: relative;
  font-size: .95rem;
  color: var(--text);
  border-bottom: 1px solid var(--border);
}

.topic-card ul li:last-child { border-bottom: none; }

.topic-card ul li::before {
  content: '→';
  position: absolute; left: 0;
  color: var(--blue);
  font-weight: 600;
}

/* ── GOALS ── */
.goals-list { list-style: none; padding: 0; max-width: 820px; }
.goals-list li {
  display: flex;
  gap: 1rem;
  padding: .9rem 0;
  border-bottom: 1px solid var(--border);
  font-size: .975rem;
}
.goals-list li:last-child { border-bottom: none; }
.goal-num {
  flex-shrink: 0;
  width: 32px; height: 32px;
  background: var(--blue);
  color: var(--white);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: .85rem;
  margin-top: .1rem;
}

/* ── PROGRAM ── */
.program-table {
  width: 100%;
  border-collapse: collapse;
  font-size: .95rem;
  box-shadow: var(--card-shadow);
  border-radius: 10px;
  overflow: hidden;
}

.program-table thead tr { background: var(--navy); color: var(--white); }
.program-table th { padding: .85rem 1.25rem; text-align: left; font-size: .875rem; letter-spacing: .3px; }
.program-table tbody tr { border-bottom: 1px solid var(--border); }
.program-table tbody tr:last-child { border-bottom: none; }
.program-table tbody tr:nth-child(even) { background: var(--light); }
.program-table td { padding: .8rem 1.25rem; vertical-align: top; }
.program-table td:first-child { white-space: nowrap; font-weight: 600; color: var(--blue); }

.session-title { font-weight: 600; color: var(--navy); }
.session-desc { font-size: .875rem; color: var(--gray); margin-top: .2rem; }

/* ── SUBMISSION ── */
.submission-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.submission-card {
  background: var(--white);
  border-radius: 10px;
  padding: 1.75rem;
  box-shadow: var(--card-shadow);
  border-left: 5px solid var(--blue);
}

.submission-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: .5rem;
}

.submission-card .badge {
  display: inline-block;
  background: var(--accent);
  color: var(--white);
  font-size: .78rem;
  font-weight: 600;
  padding: .2rem .65rem;
  border-radius: 30px;
  margin-bottom: .75rem;
}

.submission-card p { font-size: .95rem; color: var(--text); }

.award-box {
  background: linear-gradient(135deg, #fef3c7, #fde68a);
  border-left: 5px solid #f59e0b;
  border-radius: 8px;
  padding: 1.25rem 1.5rem;
  display: flex; align-items: flex-start; gap: 1rem;
  max-width: 720px;
}

.award-box .award-icon { font-size: 1.75rem; flex-shrink: 0; }
.award-box p { font-size: .95rem; color: #78350f; }
.award-box strong { color: #92400e; }

.review-info {
  background: var(--light);
  border-radius: 8px;
  padding: 1.25rem 1.5rem;
  margin-top: 1.5rem;
  max-width: 720px;
  font-size: .95rem;
  color: var(--text);
}

/* ── ORGANIZERS ── */
.organizers-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(310px, 1fr));
  gap: 1.5rem;
}

.organizer-card {
  background: var(--white);
  border-radius: 10px;
  padding: 1.75rem;
  box-shadow: var(--card-shadow);
}

.organizer-header { display: flex; align-items: center; gap: 1rem; margin-bottom: .9rem; }

.organizer-avatar {
  width: 52px; height: 52px;
  border-radius: 50%;
  background: var(--blue);
  color: var(--white);
  font-size: 1.25rem;
  font-weight: 700;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}

.organizer-name { font-size: 1.05rem; font-weight: 700; color: var(--navy); }
.organizer-title { font-size: .85rem; color: var(--gray); margin-top: .1rem; }
.organizer-inst { font-size: .83rem; color: var(--blue); font-weight: 600; }

.organizer-bio { font-size: .88rem; line-height: 1.6; color: var(--text); }

/* ── DATES ── */
.dates-table {
  width: 100%;
  border-collapse: collapse;
  max-width: 620px;
  box-shadow: var(--card-shadow);
  border-radius: 10px;
  overflow: hidden;
  font-size: .95rem;
}

.dates-table thead tr { background: var(--navy); color: var(--white); }
.dates-table th { padding: .75rem 1.25rem; text-align: left; font-size: .875rem; }
.dates-table tbody tr { border-bottom: 1px solid var(--border); }
.dates-table tbody tr:last-child { border-bottom: none; }
.dates-table td { padding: .8rem 1.25rem; }
.dates-table td:first-child { font-weight: 600; color: var(--navy); }
.dates-table td:last-child { color: var(--blue); font-weight: 500; }
.dates-note { font-size: .875rem; color: var(--gray); margin-top: 1rem; max-width: 620px; }

/* ── FOOTER ── */
footer {
  background: var(--navy);
  color: rgba(255,255,255,.7);
  text-align: center;
  padding: 2.5rem 1.5rem;
  font-size: .875rem;
}

footer a { color: var(--accent); text-decoration: none; }
footer a:hover { text-decoration: underline; }
.footer-title { font-weight: 700; color: var(--white); margin-bottom: .35rem; }

/* ── MOBILE ── */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 56px; left: 0; right: 0;
    background: var(--navy);
    padding: .5rem 1rem 1rem;
    gap: 0;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: .6rem .75rem; border-radius: 5px; }
  .nav-toggle { display: block; }

  .hero { height: 340px; }
  section { padding: 3rem 1.25rem; }
  .program-table { font-size: .85rem; }
  .program-table th, .program-table td { padding: .65rem .9rem; }
}