:root {
  --green-900: #072c14;
  --green-800: #113b20;
  --green-700: #0e5828;
  --green-600: #15843c;
  --green-500: #33b160;
  --green-200: #b0e8c4;
  --green-100: #e6f8ed;
  --ink: #191919;
  --muted: #5a5a5a;
  --bg: #fbfbfb;
  --radius: 14px;
  --font: "Avenir Next", Avenir, "Nunito Sans", "Segoe UI", system-ui, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  font-size: 17px;
}
img { max-width: 100%; display: block; }
a { color: var(--green-600); }
h1, h2, h3 { line-height: 1.2; margin: 0 0 .5em; font-weight: 800; color: var(--green-900); }
h1 { font-size: clamp(2.2rem, 5vw, 3.6rem); }
h2 { font-size: clamp(1.7rem, 3.5vw, 2.4rem); }
h3 { font-size: 1.25rem; }
.container { width: min(1100px, 92vw); margin: 0 auto; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 10;
  background: rgba(255,255,255,.95);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid #e8e8e8;
}
.nav { display: flex; align-items: center; justify-content: space-between; padding: 14px 0; gap: 16px; }
.brand { font-weight: 800; font-size: 1.35rem; color: var(--green-700); text-decoration: none; letter-spacing: .01em; }
.brand span { color: var(--green-500); }
.nav-links { display: flex; gap: 6px; list-style: none; margin: 0; padding: 0; }
.nav-links a {
  display: block; padding: 8px 14px; border-radius: 999px;
  text-decoration: none; color: var(--ink); font-weight: 600;
}
.nav-links a:hover { background: var(--green-100); color: var(--green-700); }
.nav-links a[aria-current="page"] { background: var(--green-600); color: #fff; }
.menu-toggle { display: none; background: none; border: 0; font-size: 1.6rem; cursor: pointer; color: var(--green-700); }

@media (max-width: 680px) {
  .menu-toggle { display: block; }
  .nav { flex-wrap: wrap; }
  .nav-links { display: none; width: 100%; flex-direction: column; padding-bottom: 8px; }
  .nav-links.open { display: flex; }
}

/* Hero */
.hero {
  position: relative; color: #fff; min-height: 72vh;
  display: flex; align-items: flex-end;
  background: var(--green-900) center/cover no-repeat;
}
.hero::before {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(7,44,20,.15) 0%, rgba(7,44,20,.85) 100%);
}
.hero .container { position: relative; padding: 80px 0 64px; }
.hero h1 { color: #fff; margin-bottom: .3em; }
.hero p { max-width: 720px; font-size: 1.15rem; margin: 0; opacity: .95; }

.page-hero { background: var(--green-700); color: #fff; padding: 72px 0 56px; }
.page-hero h1 { color: #fff; }
.page-hero p { max-width: 720px; margin: 0; opacity: .92; font-size: 1.1rem; }

section { padding: 72px 0; }
.eyebrow { text-transform: uppercase; letter-spacing: .14em; font-size: .8rem; font-weight: 700; color: var(--green-600); margin-bottom: 8px; }

/* Home info */
.info-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 24px; }
.info-card {
  background: #fff; border-radius: var(--radius); padding: 28px;
  border: 1px solid #ececec; box-shadow: 0 4px 18px rgba(0,0,0,.04);
}
.info-card .big { font-size: 1.5rem; font-weight: 800; color: var(--green-700); }
.cta-band { background: var(--green-100); }
.cta-band .container { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 20px; }
.btn {
  display: inline-block; padding: 12px 26px; border-radius: 999px;
  background: var(--green-600); color: #fff; font-weight: 700; text-decoration: none;
  border: 0; cursor: pointer; font: inherit; font-weight: 700;
}
.btn:hover { background: var(--green-700); }
.btn.outline { background: transparent; color: var(--green-700); border: 2px solid var(--green-600); }
.btn.outline:hover { background: var(--green-600); color: #fff; }

/* Team */
.team-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(290px, 1fr)); gap: 28px; }
.person { background: #fff; border-radius: var(--radius); overflow: hidden; border: 1px solid #ececec; }
.person img { width: 100%; aspect-ratio: 1; object-fit: cover; }
.person .body { padding: 22px 24px 26px; }
.role { color: var(--green-600); font-weight: 700; font-size: .9rem; text-transform: uppercase; letter-spacing: .08em; margin: 0 0 4px; }
.person h3 { margin-bottom: .4em; }
.person p { margin: 0; color: var(--muted); }
.person .next { margin-top: 12px; font-weight: 700; color: var(--green-800); font-size: .95rem; }
.alumni-head { margin-top: 72px; }

/* Speakers */
.filters { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 32px; }
.filters button {
  font: inherit; font-weight: 600; font-size: .95rem; padding: 8px 16px; border-radius: 999px;
  border: 1.5px solid var(--green-200); background: #fff; color: var(--green-800); cursor: pointer;
}
.filters button[aria-pressed="true"] { background: var(--green-600); border-color: var(--green-600); color: #fff; }
.speaker {
  display: grid; grid-template-columns: 220px 1fr; gap: 28px;
  background: #fff; border-radius: var(--radius); border: 1px solid #ececec;
  padding: 24px; margin-bottom: 24px;
}
.speaker[hidden] { display: none; }
.speaker .thumb { position: relative; border-radius: 10px; overflow: hidden; align-self: start; }
.speaker .thumb img { width: 100%; aspect-ratio: 3/4; object-fit: cover; transition: transform .3s; }
.speaker .thumb:hover img { transform: scale(1.04); }
.speaker .play {
  position: absolute; left: 50%; top: 50%; transform: translate(-50%,-50%);
  width: 58px; height: 58px; border-radius: 50%; background: rgba(21,132,60,.92);
  display: grid; place-items: center; color: #fff; font-size: 1.4rem;
}
.speaker blockquote {
  margin: 0 0 14px; padding-left: 16px; border-left: 4px solid var(--green-500);
  font-size: 1.15rem; font-style: italic; color: var(--green-800);
}
.meta { font-size: .9rem; color: var(--muted); margin-bottom: 10px; }
.tag { display: inline-block; background: var(--green-100); color: var(--green-700); font-size: .8rem; font-weight: 700; padding: 3px 10px; border-radius: 999px; margin: 0 6px 6px 0; }
.speaker details summary { cursor: pointer; font-weight: 700; color: var(--green-600); margin: 6px 0; }
.speaker details p { color: var(--muted); }
.speaker .btn { margin-top: 10px; }
@media (max-width: 640px) {
  .speaker { grid-template-columns: 1fr; }
  .speaker .thumb { max-width: 260px; }
}

/* Contact */
.contact-wrap { display: grid; grid-template-columns: 1fr 1.3fr; gap: 48px; align-items: start; }
@media (max-width: 800px) { .contact-wrap { grid-template-columns: 1fr; } }
form.card { background: #fff; padding: 32px; border-radius: var(--radius); border: 1px solid #ececec; }
label { display: block; font-weight: 700; margin-bottom: 6px; }
input, textarea {
  width: 100%; font: inherit; padding: 12px 14px; border-radius: 10px;
  border: 1.5px solid #d8d8d8; margin-bottom: 18px; background: #fff;
}
input:focus, textarea:focus { outline: none; border-color: var(--green-500); box-shadow: 0 0 0 3px var(--green-100); }
textarea { min-height: 150px; resize: vertical; }
.hidden { display: none; }

/* Footer */
.site-footer { background: var(--green-900); color: #dfe9e2; padding: 48px 0 32px; }
.site-footer .container { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 24px; }
.site-footer strong { color: #fff; font-size: 1.15rem; }
.site-footer a { color: var(--green-200); }
.site-footer small { display: block; opacity: .75; margin-top: 4px; }