:root {
  --bg: #f7fbf8;
  --surface: #ffffff;
  --text: #1f2937;
  --muted: #5b6472;
  --line: #dde3ea;
  --primary: #1b8a4d;
  --primary-2: #166a3c;
  --alt: #eef9f3;
  --shadow: 0 10px 30px rgba(10, 20, 40, 0.08);
  --radius: 18px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
}

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

.container {
  width: min(1100px, calc(100% - 2rem));
  margin: 0 auto;
}

.hero {
  background: linear-gradient(135deg, #0f4022 0%, #1b8a4d 55%, #4bb578 100%);
  color: #fff;
  padding-bottom: 3rem;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 0;
  gap: 1rem;
}
.brand {
  font-weight: 800;
  letter-spacing: 0.02em;
}
.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}
.nav-links a {
  color: rgba(255,255,255,0.9);
  font-weight: 600;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.4fr 0.9fr;
  gap: 2rem;
  align-items: center;
  padding: 3rem 0 1rem;
}
.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.78rem;
  opacity: 0.82;
}
h1 {
  margin: 0.3rem 0 1rem;
  font-size: clamp(2.3rem, 5vw, 4rem);
  line-height: 1.1;
}
.lead {
  font-size: 1.1rem;
  max-width: 42rem;
  color: rgba(255,255,255,0.92);
}
.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 1.4rem 0;
}
.hero-meta span {
  background: rgba(255,255,255,0.14);
  border: 1px solid rgba(255,255,255,0.2);
  padding: 0.55rem 0.8rem;
  border-radius: 999px;
  font-size: 0.94rem;
}
.hero-actions {
  display: flex;
  gap: 0.9rem;
  flex-wrap: wrap;
}
.btn {
  display: inline-block;
  padding: 0.85rem 1.1rem;
  border-radius: 12px;
  font-weight: 700;
}
.btn-primary {
  background: #fff;
  color: var(--primary-2);
}
.btn-secondary {
  background: rgba(255,255,255,0.12);
  color: #fff;
  border: 1px solid rgba(255,255,255,0.25);
}

.section {
  padding: 4rem 0;
}
.alt {
  background: var(--alt);
}
h2 {
  margin-top: 0;
  margin-bottom: 1rem;
  font-size: 2rem;
}
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.3rem 1.4rem;
  box-shadow: var(--shadow);
}
.highlight {
  color: var(--text);
}
.clean-list {
  list-style: none;
  padding-left: 0;
  margin: 0;
}
.clean-list li + li {
  margin-top: 0.7rem;
}
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem 2rem;
}
.speaker-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.2rem;
}
.person h3 {
  margin-bottom: 0.3rem;
}
.avatar {
  width: 100%;
  aspect-ratio: 1.2;
  background: linear-gradient(135deg, #d9f3e3, #eef9f3);
  border-radius: 14px;
  display: grid;
  place-items: center;
  color: var(--muted);
  font-weight: 700;
  margin-bottom: 1rem;
}
.avatar_supawut {
  width: 100%;
  aspect-ratio: 1.2;
  background-image: url("img/supawut.jpg");
  background-size: cover;
  border-radius: 14px;
  display: grid;
  place-items: center;
  color: var(--muted);
  font-weight: 700;
  margin-bottom: 1rem;
}
.avatar_ito {
  width: 100%;
  aspect-ratio: 1.2;
  background-image: url("img/ito.jpg");
  background-size: cover;
  border-radius: 14px;
  display: grid;
  place-items: center;
  color: var(--muted);
  font-weight: 700;
  margin-bottom: 1rem;
}

.about-figure {
  margin: 2rem auto;
  max-width: 780px;
  text-align: center;
}
.about-figure img {
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}
.about-figure figcaption {
  margin-top: 0.7rem;
  color: var(--muted);
  font-size: 0.92rem;
}

table {
  width: 100%;
  border-collapse: collapse;
}
th, td {
  text-align: left;
  padding: 0.85rem 0.4rem;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
th {
  width: 35%;
}
.note {
  color: var(--muted);
  font-size: 0.95rem;
}
.footer {
  padding: 2rem 0 3rem;
  color: var(--muted);
}

@media (max-width: 900px) {
  .hero-grid,
  .speaker-grid,
  .grid-2 {
    grid-template-columns: 1fr;
  }
  .nav {
    flex-direction: column;
    align-items: flex-start;
  }
}