* { box-sizing: border-box; }

:root {
  --deep-green: #0f504a;
  --aqua: #06d9c6;
  --white: #ffffff;
  --text: #1f2c2a;
  --soft: #f7fbfb;
  --shadow: 0 10px 30px rgba(15, 80, 74, 0.12);
}

body {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  background: var(--white);
  color: var(--text);
  line-height: 1.6;
}

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

.container {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.site-header {
  padding-top: 12px;
  background: var(--white);
}

.hero-shell {
  width: min(1200px, calc(100% - 24px));
  margin: 0 auto;
}

.hero-image {
  width: 100%;
  height: auto;
  border-radius: 10px;
}

.topbar { padding: 24px 0 20px; }

.brand {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-bottom: 18px;
}

.logo {
  width: 110px;
  height: auto;
  flex-shrink: 0;
}

.brand-text h1 {
  margin: 0 0 8px;
  color: var(--deep-green);
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1.1;
}

.brand-sub {
  margin: 0;
  color: var(--deep-green);
  font-size: clamp(1rem, 2vw, 1.2rem);
  font-weight: 700;
}

.main-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding: 14px 0 4px;
  border-top: 2px solid rgba(15, 80, 74, 0.15);
}

.main-nav a {
  text-decoration: none;
  color: var(--deep-green);
  font-weight: 700;
  padding: 10px 16px;
  border-radius: 999px;
}

.main-nav a:hover,
.main-nav a.active {
  background: var(--aqua);
}

.studies-main {
  padding: 20px 0 50px;
}

.intro-box,
.submit-box {
  background: var(--aqua);
  color: var(--deep-green);
  padding: 28px;
  border-radius: 20px;
  box-shadow: var(--shadow);
  margin-bottom: 24px;
}

.intro-box h2,
.submit-box h3 {
  margin: 0 0 12px;
  font-size: clamp(1.8rem, 3vw, 2.5rem);
}

.intro-box p,
.submit-box p {
  margin: 0;
  font-size: 1.08rem;
  font-weight: 700;
}

.feature-list {
  margin: 10px 0 18px 18px;
  padding-left: 20px;
}

.feature-list li {
  margin: 10px 0;
  font-weight: 700;
}

.resources-card {
  background: var(--white);
  border: 1px solid rgba(15, 80, 74, 0.12);
  border-radius: 22px;
  padding: 30px;
  box-shadow: var(--shadow);
  margin-bottom: 24px;
}

.resources-card h3 {
  margin: 0 0 24px;
  color: var(--deep-green);
  font-size: clamp(1.5rem, 2.6vw, 2.1rem);
}

.study-list {
  display: grid;
  gap: 18px;
}

.study-item {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  padding: 20px;
  border-radius: 18px;
  background: #f9fffe;
  border: 1px solid rgba(15, 80, 74, 0.10);
}

.study-info h4 {
  margin: 0 0 8px;
  font-size: 1.22rem;
}

.study-info h4 a {
  color: var(--deep-green);
  text-decoration: none;
}

.study-info h4 a:hover {
  text-decoration: underline;
}

.study-info p {
  margin: 0;
}

.study-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-width: 130px;
  align-items: stretch;
  justify-content: center;
}

.btn {
  display: inline-block;
  background: var(--deep-green);
  color: var(--white);
  text-decoration: none;
  border: 0;
  padding: 12px 18px;
  border-radius: 12px;
  font-weight: 700;
  text-align: center;
}

.btn-secondary {
  background: #14897e;
}

.submit-note {
  margin: 16px 0 18px;
  padding: 14px 16px;
  border-radius: 14px;
  background: rgba(255,255,255,0.65);
  font-weight: 700;
}

.site-footer { margin-top: 24px; }

.footer-banner {
  background: var(--deep-green);
  color: var(--white);
  text-align: center;
  font-weight: 800;
  padding: 24px 16px;
  font-size: clamp(1.1rem, 2.4vw, 1.5rem);
}

.footer-copy {
  text-align: center;
  color: var(--deep-green);
  font-weight: 700;
  padding: 16px;
}

@media (max-width: 760px) {
  .brand {
    flex-direction: column;
    text-align: center;
  }

  .main-nav {
    justify-content: center;
  }

  .study-item {
    flex-direction: column;
  }

  .study-actions {
    flex-direction: row;
    min-width: 0;
  }

  .resources-card,
  .intro-box,
  .submit-box {
    padding: 22px;
  }

  .logo {
    width: 95px;
  }
}