/* =====================================================
   LearningSuccess@ICCE2026 — Palette A: Academic Trust + GenAI Blue
   Primary navy, GenAI blue/cyan secondary, warm amber CTA accents
   ===================================================== */

:root {
  --navy-900: #0b1f3a;
  --navy-800: #102a4c;
  --navy-700: #16365f;
  --blue-600: #2563eb;
  --blue-500: #3b82f6;
  --cyan-400: #38bdf8;
  --cyan-100: #e0f2fe;
  --amber-500: #f59e0b;
  --amber-600: #d97706;
  --ink-900: #1e293b;
  --ink-600: #475569;
  --paper: #ffffff;
  --paper-alt: #f1f5f9;
  --border: #e2e8f0;
  --radius: 12px;
  --shadow: 0 2px 12px rgba(11, 31, 58, 0.08);
  --shadow-lg: 0 8px 24px rgba(11, 31, 58, 0.12);
  --container: 1100px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 76px;
}

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink-900);
  background: var(--paper);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

a {
  color: var(--blue-600);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* ===== Header / Nav ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(11, 31, 58, 0.97);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(56, 189, 248, 0.25);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  font-weight: 700;
  font-size: 1.05rem;
}

.brand:hover {
  text-decoration: none;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--blue-500), var(--cyan-400));
  color: #fff;
  font-size: 0.85rem;
  font-weight: 800;
  letter-spacing: 0.02em;
}

.brand-at {
  color: var(--cyan-400);
  font-weight: 600;
}

.site-nav {
  display: flex;
  gap: 4px;
}

.site-nav a {
  color: #dbe7f5;
  font-size: 0.92rem;
  font-weight: 500;
  padding: 8px 12px;
  border-radius: 8px;
  transition: background 0.15s, color 0.15s;
}

.site-nav a:hover {
  background: rgba(56, 189, 248, 0.15);
  color: #fff;
  text-decoration: none;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  display: block;
  height: 2px;
  width: 100%;
  background: #fff;
  border-radius: 2px;
  transition: transform 0.2s, opacity 0.2s;
}

/* ===== Hero ===== */
.hero {
  background:
    radial-gradient(ellipse 80% 60% at 70% 20%, rgba(56, 189, 248, 0.22), transparent),
    radial-gradient(ellipse 60% 50% at 20% 80%, rgba(37, 99, 235, 0.30), transparent),
    linear-gradient(160deg, var(--navy-900) 0%, var(--navy-800) 55%, var(--navy-700) 100%);
  color: #fff;
  padding: 96px 0 88px;
  text-align: center;
}

.hero-kicker {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--cyan-400);
  border: 1px solid rgba(56, 189, 248, 0.4);
  border-radius: 999px;
  padding: 6px 18px;
  margin-bottom: 28px;
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3.3rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 18px;
}

.hero-subtitle {
  font-size: clamp(1rem, 2.2vw, 1.25rem);
  color: #c7d7ec;
  margin-bottom: 22px;
}

.hero-tags {
  font-size: 1rem;
  font-weight: 600;
  color: var(--cyan-400);
  margin-bottom: 26px;
}

.hero-tags .dot {
  margin: 0 10px;
  color: #5b7798;
}

.hero-meta {
  display: flex;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 36px;
}

.hero-meta-item {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 999px;
  padding: 8px 20px;
  font-size: 0.95rem;
  color: #e6eef8;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

/* ===== Buttons ===== */
.btn {
  display: inline-block;
  padding: 13px 32px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 1rem;
  transition: transform 0.15s, box-shadow 0.15s, background 0.15s;
}

.btn:hover {
  text-decoration: none;
  transform: translateY(-2px);
}

.btn-primary {
  background: var(--amber-500);
  color: var(--navy-900);
  box-shadow: 0 4px 14px rgba(245, 158, 11, 0.35);
}

.btn-primary:hover {
  background: var(--amber-600);
  color: #fff;
}

.btn-ghost {
  background: transparent;
  color: #fff;
  border: 1.5px solid rgba(255, 255, 255, 0.45);
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: #fff;
}

.btn-block {
  display: block;
  text-align: center;
  width: 100%;
}

.btn-disabled {
  opacity: 0.75;
  cursor: not-allowed;
  pointer-events: none;
}

.btn-outline {
  background: var(--paper);
  color: var(--navy-800);
  border: 1.5px solid var(--border);
  box-shadow: none;
}

.btn-outline:hover {
  border-color: var(--blue-500);
  color: var(--blue-600);
  background: var(--paper-alt);
}

/* ===== News strip ===== */
.news-strip {
  background: var(--paper-alt);
  padding: 36px 0;
  border-bottom: 1px solid var(--border);
}

.news-box {
  background: var(--paper);
  border: 1px solid var(--border);
  border-left: 4px solid var(--amber-500);
  border-radius: var(--radius);
  padding: 24px 28px;
  box-shadow: var(--shadow);
}

.news-heading {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--navy-800);
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.news-item {
  font-size: 0.96rem;
  color: var(--ink-600);
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.news-badge {
  flex-shrink: 0;
  font-size: 1.1rem;
  line-height: 1.5;
}

/* ===== Sections ===== */
.section {
  padding: 80px 0;
}

.section-alt {
  background: var(--paper-alt);
}

.section-title {
  font-size: clamp(1.6rem, 3.5vw, 2.2rem);
  font-weight: 800;
  color: var(--navy-900);
  letter-spacing: -0.01em;
  margin-bottom: 16px;
  position: relative;
  padding-bottom: 16px;
}

.section-title::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 56px;
  height: 4px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--blue-500), var(--cyan-400));
}

.section-lead {
  font-size: 1.05rem;
  color: var(--ink-600);
  max-width: 760px;
  margin-bottom: 36px;
}

/* ===== About ===== */
.about-grid {
  display: grid;
  grid-template-columns: 1.7fr 1fr;
  gap: 40px;
  margin-top: 24px;
}

.about-text p {
  margin-bottom: 18px;
  color: var(--ink-600);
  font-size: 1.02rem;
}

.about-text strong {
  color: var(--navy-800);
}

.aside-card {
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  margin-bottom: 20px;
}

.aside-card h3 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--blue-600);
  margin-bottom: 14px;
}

.shift {
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 0.95rem;
}

.shift-from {
  color: var(--ink-600);
}

.shift-arrow {
  color: var(--amber-500);
  font-size: 1.3rem;
  font-weight: 700;
}

.shift-to {
  color: var(--navy-800);
  font-weight: 600;
}

.aside-ref p {
  font-size: 0.88rem;
  color: var(--ink-600);
}

/* ===== Topics ===== */
.topic-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.topic-card {
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  box-shadow: var(--shadow);
  transition: transform 0.18s, box-shadow 0.18s, border-color 0.18s;
}

.topic-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--cyan-400);
}

.topic-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 10px;
  background: var(--cyan-100);
  font-size: 1.4rem;
  margin-bottom: 16px;
}

.topic-card h3 {
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--navy-800);
  margin-bottom: 10px;
}

.topic-card p {
  font-size: 0.92rem;
  color: var(--ink-600);
}

.topic-full {
  margin-top: 32px;
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 24px;
}

.topic-full summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--blue-600);
  font-size: 0.98rem;
}

.topic-full-list {
  margin: 16px 0 6px;
  padding-left: 22px;
  columns: 2;
  column-gap: 40px;
}

.topic-full-list li {
  font-size: 0.93rem;
  color: var(--ink-600);
  margin-bottom: 9px;
  break-inside: avoid;
}

/* ===== Dates ===== */
.dates-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 32px;
}

.date-card {
  background: var(--paper);
  border: 1px solid var(--border);
  border-top: 4px solid var(--blue-500);
  border-radius: var(--radius);
  padding: 26px 20px;
  text-align: center;
  box-shadow: var(--shadow);
}

.date-highlight {
  border-top-color: var(--amber-500);
  background: linear-gradient(180deg, #fffbeb 0%, var(--paper) 60%);
}

.date-label {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--ink-600);
  margin-bottom: 10px;
}

.date-value {
  font-size: 1.18rem;
  font-weight: 800;
  color: var(--navy-900);
  margin-bottom: 6px;
}

.date-highlight .date-value {
  color: var(--amber-600);
}

.date-note {
  font-size: 0.83rem;
  color: var(--ink-600);
}

/* ===== Submission ===== */
.submit-compact {
  margin-top: 24px;
  background: var(--paper);
  border: 1px solid var(--border);
  border-top: 4px solid var(--amber-500);
  border-radius: var(--radius);
  padding: 28px 32px;
  box-shadow: var(--shadow);
}

.submit-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}

.submit-link {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--blue-600);
}

.submit-link:hover {
  color: var(--navy-800);
}

.submit-details {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.submit-block h3 {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--navy-800);
  margin-bottom: 10px;
}

.submit-block p {
  font-size: 0.9rem;
  color: var(--ink-600);
  line-height: 1.55;
}

.compact-list {
  list-style: none;
  font-size: 0.9rem;
  color: var(--ink-600);
}

.compact-list li {
  padding: 4px 0;
}


/* ===== Program ===== */
.program-placeholder {
  background: var(--paper-alt);
  border: 1.5px dashed var(--border);
  border-radius: var(--radius);
  padding: 56px 32px;
  text-align: center;
  max-width: 760px;
  margin: 28px auto 0;
}

.program-coming {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--blue-600);
  background: var(--cyan-100);
  border-radius: 999px;
  padding: 6px 20px;
  margin-bottom: 18px;
}

.program-placeholder p:last-child {
  color: var(--ink-600);
  font-size: 0.95rem;
  margin-top: 4px;
}

/* ===== Organizers ===== */
.organizer-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 22px;
  margin-top: 28px;
}

.organizer-card {
  flex: 0 1 280px;
  max-width: 300px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 28px 22px 24px;
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: border-color 0.2s, box-shadow 0.2s, transform 0.2s;
}

.organizer-card:hover {
  border-color: rgba(37, 99, 235, 0.22);
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.organizer-avatar {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: linear-gradient(145deg, var(--navy-700), var(--blue-500));
  color: #fff;
  font-weight: 800;
  font-size: 0.88rem;
  letter-spacing: 0.03em;
  margin-bottom: 14px;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.2);
}

.organizer-card h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--navy-900);
  margin-bottom: 6px;
  line-height: 1.35;
}

.organizer-affil {
  font-size: 0.84rem;
  font-weight: 500;
  color: var(--ink-600);
  line-height: 1.45;
}

/* ===== Footer ===== */
.site-footer {
  background: var(--navy-900);
  color: #c7d7ec;
  padding: 64px 0 0;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 32px;
  padding-bottom: 28px;
}

.footer-contact {
  font-size: 0.97rem;
  color: #c7d7ec;
}

.footer-contact-note {
  margin-top: 6px;
  font-size: 0.88rem;
  color: #7d93b2;
}

.footer-links h3 {
  color: #fff;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 14px;
}

.footer-links a {
  display: block;
  color: #c7d7ec;
  font-size: 0.95rem;
  padding: 5px 0;
}

.footer-links a:hover {
  color: var(--cyan-400);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding-top: 18px;
  padding-bottom: 22px;
  text-align: center;
}

.footer-bottom p {
  font-size: 0.85rem;
  color: #7d93b2;
}

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .topic-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .organizer-card {
    flex: 0 1 calc(50% - 11px);
    max-width: none;
  }

  .dates-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .about-grid,
  .submit-details {
    grid-template-columns: 1fr;
  }

  .topic-full-list {
    columns: 1;
  }
}

@media (max-width: 680px) {
  .nav-toggle {
    display: flex;
  }

  .site-nav {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--navy-900);
    padding: 12px 24px 20px;
    border-bottom: 1px solid rgba(56, 189, 248, 0.25);
  }

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

  .site-nav a {
    padding: 12px;
  }

  .hero {
    padding: 64px 0 60px;
  }

  .topic-grid,
  .dates-grid {
    grid-template-columns: 1fr;
  }

  .organizer-card {
    flex: 1 1 100%;
    max-width: 340px;
  }

  .footer-inner {
    flex-direction: column;
    gap: 24px;
  }
}