:root {
  --teal: #0B5D68;
  --teal-light: #E8F2F2;
  --navy: #1B4B91;
  --amber: #E8A33D;
  --ink: #1A2027;
  --gray-700: #4B5563;
  --gray-500: #6B7280;
  --gray-200: #E5E7EB;
  --gray-100: #F4F6F7;
  --white: #FFFFFF;
  --max-width: 1080px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--white);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }

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

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

/* Header */
.site-header {
  border-bottom: 1px solid var(--gray-200);
  position: sticky;
  top: 0;
  background: rgba(255,255,255,0.96);
  backdrop-filter: blur(6px);
  z-index: 100;
}
.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}
.brand { display: flex; align-items: center; gap: 10px; }
.brand img { height: 34px; width: auto; }
.brand-wordmark { font-weight: 700; font-size: 1.25rem; }
.brand-wordmark .bio { color: var(--teal); }
.brand-wordmark .policy { color: var(--navy); }

nav.main-nav { display: flex; gap: 28px; }
nav.main-nav a {
  color: var(--gray-700);
  font-weight: 600;
  font-size: 0.95rem;
}
nav.main-nav a:hover { color: var(--teal); text-decoration: none; }
nav.main-nav a.active { color: var(--teal); }

.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.6rem;
  cursor: pointer;
  color: var(--ink);
}

@media (max-width: 760px) {
  nav.main-nav {
    display: none;
    position: absolute;
    top: 76px;
    left: 0;
    right: 0;
    background: var(--white);
    border-bottom: 1px solid var(--gray-200);
    flex-direction: column;
    padding: 16px 24px 24px;
    gap: 16px;
  }
  nav.main-nav.open { display: flex; }
  .nav-toggle { display: block; }
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 12px 22px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary { background: var(--teal); color: var(--white); }
.btn-primary:hover { box-shadow: 0 6px 16px rgba(11,93,104,0.28); }
.btn-outline { background: transparent; color: var(--navy); border: 1.5px solid var(--navy); }
.btn-outline:hover { background: var(--navy); color: var(--white); }
.btn-row { display: flex; gap: 14px; flex-wrap: wrap; }

/* Hero */
.hero {
  padding: 84px 0 64px;
  background: linear-gradient(180deg, var(--teal-light) 0%, var(--white) 100%);
}
.hero h1 {
  font-size: clamp(2rem, 4.5vw, 3rem);
  line-height: 1.15;
  margin: 0 0 18px;
  color: var(--ink);
}
.hero p.lede {
  font-size: 1.15rem;
  color: var(--gray-700);
  max-width: 640px;
  margin: 0 0 32px;
}

.page-hero {
  padding: 56px 0 40px;
  border-bottom: 1px solid var(--gray-200);
}
.page-hero .eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--amber);
  margin-bottom: 10px;
}
.page-hero h1 { font-size: clamp(1.8rem, 4vw, 2.5rem); margin: 0 0 14px; }
.page-hero p.lede { font-size: 1.05rem; color: var(--gray-700); max-width: 680px; margin: 0; }

/* Sections */
section { padding: 64px 0; }
section.alt { background: var(--gray-100); }
h2.section-title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  margin: 0 0 12px;
}
p.section-lede { color: var(--gray-700); max-width: 700px; margin: 0 0 40px; }

/* Feature grid */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
@media (max-width: 760px) { .feature-grid { grid-template-columns: 1fr; } }
.feature-card {
  border: 1px solid var(--gray-200);
  border-radius: 12px;
  padding: 28px;
  background: var(--white);
}
.feature-card .icon-dot {
  width: 36px; height: 36px; border-radius: 50%;
  background: var(--teal-light);
  color: var(--teal);
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; margin-bottom: 16px;
}
.feature-card h3 { margin: 0 0 8px; font-size: 1.1rem; }
.feature-card p { margin: 0; color: var(--gray-700); font-size: 0.95rem; }

/* Hero image */
.hero-image-frame {
  border-radius: 16px;
  overflow: hidden;
  margin-top: 48px;
  box-shadow: 0 20px 50px rgba(27,75,145,0.15);
}
.hero-image-frame img { width: 100%; height: 320px; object-fit: cover; }

/* Two column */
.two-col {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}
@media (max-width: 760px) { .two-col { grid-template-columns: 1fr; } }
.two-col img { border-radius: 14px; width: 100%; height: 280px; object-fit: cover; }

/* Blog list */
.post-list { display: flex; flex-direction: column; gap: 0; }
.post-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 24px;
  padding: 26px 0;
  border-bottom: 1px solid var(--gray-200);
}
.post-row h3 { margin: 0 0 6px; font-size: 1.15rem; }
.post-row p { margin: 0; color: var(--gray-700); font-size: 0.92rem; }
.post-row .post-num { color: var(--amber); font-weight: 700; font-size: 0.85rem; min-width: 28px; }
.post-row-inner { display: flex; gap: 18px; }

/* Post page */
.post-content { max-width: 720px; margin: 0 auto; }
.post-content h1 { font-size: clamp(1.7rem, 4vw, 2.3rem); margin: 0 0 20px; line-height: 1.2; }
.post-content p { color: var(--ink); font-size: 1.05rem; margin: 0 0 22px; }
.post-content h2 { font-size: 1.3rem; margin: 36px 0 14px; }
.post-content .sources { margin-top: 48px; padding-top: 24px; border-top: 1px solid var(--gray-200); }
.post-content .sources h3 { font-size: 0.95rem; text-transform: uppercase; letter-spacing: 0.05em; color: var(--gray-500); margin-bottom: 12px; }
.post-content .sources ul { padding-left: 20px; margin: 0; font-size: 0.9rem; color: var(--gray-700); }
.post-content .sources li { margin-bottom: 6px; }
.back-link { display: inline-block; margin-bottom: 28px; font-weight: 600; font-size: 0.9rem; }

/* Status tags */
.tag { display: inline-block; font-size: 0.75rem; font-weight: 700; padding: 4px 10px; border-radius: 100px; text-transform: uppercase; letter-spacing: 0.04em; }
.tag-progress { background: #FDF0DC; color: #966016; }
.tag-planned { background: var(--gray-200); color: var(--gray-700); }

/* Project card */
.project-card { border: 1px solid var(--gray-200); border-radius: 12px; padding: 24px 28px; margin-bottom: 16px; display: flex; justify-content: space-between; align-items: center; gap: 20px; flex-wrap: wrap; }
.project-card h3 { margin: 0 0 6px; font-size: 1.05rem; }
.project-card p { margin: 0; color: var(--gray-700); font-size: 0.9rem; }

/* Research areas */
.research-area { display: flex; gap: 20px; padding: 28px 0; border-bottom: 1px solid var(--gray-200); }
.research-area:last-child { border-bottom: none; }
.research-area .num { font-size: 1.5rem; font-weight: 800; color: var(--teal-light); min-width: 50px; -webkit-text-stroke: 1.5px var(--teal); color: transparent; }
.research-area h3 { margin: 0 0 8px; font-size: 1.15rem; }
.research-area p { margin: 0; color: var(--gray-700); }

/* Contact */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; }
@media (max-width: 760px) { .contact-grid { grid-template-columns: 1fr; } }
.contact-form { display: flex; flex-direction: column; gap: 16px; }
.contact-form label { font-weight: 600; font-size: 0.9rem; margin-bottom: 6px; display: block; }
.contact-form input, .contact-form textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1.5px solid var(--gray-200);
  border-radius: 8px;
  font-family: var(--font);
  font-size: 0.95rem;
}
.contact-form textarea { min-height: 130px; resize: vertical; }
.contact-info-item { margin-bottom: 24px; }
.contact-info-item .label { font-weight: 700; font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.05em; color: var(--amber); margin-bottom: 6px; }

/* Footer */
footer.site-footer {
  background: var(--ink);
  color: #C9CFD6;
  padding: 48px 0 32px;
  margin-top: 40px;
}
footer.site-footer .foot-top { display: flex; justify-content: space-between; align-items: flex-start; flex-wrap: wrap; gap: 24px; margin-bottom: 32px; }
footer.site-footer .brand-wordmark .bio { color: #7FD1C6; }
footer.site-footer .brand-wordmark .policy { color: #9DB8EA; }
footer.site-footer a { color: #C9CFD6; }
footer.site-footer nav { display: flex; gap: 20px; flex-wrap: wrap; }
footer.site-footer .copyright { border-top: 1px solid #333B45; padding-top: 20px; font-size: 0.85rem; color: #8892A0; }

.callout-note {
  background: var(--teal-light);
  border-left: 4px solid var(--teal);
  padding: 16px 20px;
  border-radius: 0 8px 8px 0;
  font-size: 0.92rem;
  color: var(--gray-700);
  margin: 0 0 32px;
}

/* Project detail pages */
.project-meta { display: flex; flex-wrap: wrap; gap: 8px 28px; margin: 0 0 28px; padding: 16px 20px; background: var(--gray-100); border-radius: 10px; font-size: 0.9rem; color: var(--gray-700); }
.project-meta strong { color: var(--ink); }
.stat-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin: 28px 0 36px; }
@media (max-width: 760px) { .stat-row { grid-template-columns: 1fr; } }
.stat { border: 1px solid var(--gray-200); border-radius: 12px; padding: 18px 20px; }
.stat .num { font-size: 1.7rem; font-weight: 800; color: var(--teal); line-height: 1.1; }
.stat .desc { font-size: 0.85rem; color: var(--gray-700); margin-top: 6px; }
.fig { margin: 28px 0 36px; }
.fig img { width: 100%; border: 1px solid var(--gray-200); border-radius: 10px; background: #fff; }
.fig figcaption { font-size: 0.85rem; color: var(--gray-500); margin-top: 10px; }
.data-table { width: 100%; border-collapse: collapse; margin: 20px 0 32px; font-size: 0.92rem; }
.data-table th, .data-table td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--gray-200); }
.data-table th { color: var(--gray-500); font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.05em; }
.tag-done { background: var(--teal-light); color: var(--teal); }
.project-card a.card-link { font-weight: 600; font-size: 0.9rem; white-space: nowrap; }

/* Photo gallery */
.gallery { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin: 28px 0 36px; }
.gallery figure { margin: 0; }
.gallery figure.wide { grid-column: 1 / -1; }
.gallery img { width: 100%; height: auto; border-radius: 10px; border: 1px solid var(--gray-200); }
.gallery figcaption { font-size: 0.85rem; color: var(--gray-500); margin-top: 8px; }
@media (max-width: 600px) { .gallery { grid-template-columns: 1fr; } }

/* Intro video */
.video-frame { max-width: 760px; margin: 0 auto; }
.video-frame video { width: 100%; height: auto; border-radius: 12px; background: #000; display: block; }
.video-frame p.cap { font-size: 0.85rem; color: var(--gray-500); margin: 10px 0 0; }