/* ===== Australian Institute for Heart Disease and Healthy Aging ===== */
:root {
  --primary: #0b6e7a;
  --primary-dark: #08555f;
  --accent: #c41e3a;
  --text: #1a2b3c;
  --text-light: #5a6a7a;
  --bg-light: #f7fafb;
  --white: #ffffff;
  --border: #e2e8f0;
}

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

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  color: var(--text);
  line-height: 1.6;
  background: var(--white);
}

a {
  text-decoration: none;
  color: inherit;
}

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

.container {
  width: 100%;
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Header ===== */
.header {
  background: var(--white);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}

.logo {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--primary);
  line-height: 1.3;
}

.logo span {
  display: block;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-light);
}

.nav {
  display: flex;
  gap: 32px;
  align-items: center;
}

.nav a {
  font-weight: 500;
  font-size: 0.95rem;
  transition: color 0.2s;
}

.nav a:hover,
.nav a.active {
  color: var(--primary);
}

.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: 6px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: all 0.2s;
  border: none;
  cursor: pointer;
}

.btn-primary {
  background: var(--primary);
  color: white;
}

.btn-primary:hover {
  background: var(--primary-dark);
}

.btn-accent {
  background: var(--accent);
  color: white;
}

.btn-accent:hover {
  background: #a01830;
}

.btn-outline {
  border: 2px solid var(--primary);
  color: var(--primary);
  background: transparent;
}

/* Mobile menu */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
}

/* ===== Hero ===== */
.hero {
  background: linear-gradient(135deg, #0b6e7a 0%, #0a4f58 100%);
  color: white;
  padding: 90px 0 100px;
  position: relative;
  overflow: hidden;
}

.hero-content {
  max-width: 640px;
}

.hero h1 {
  font-size: 2.8rem;
  line-height: 1.2;
  margin-bottom: 20px;
  font-weight: 700;
}

.hero p {
  font-size: 1.2rem;
  opacity: 0.92;
  margin-bottom: 32px;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

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

.section-title {
  font-size: 2rem;
  margin-bottom: 16px;
  color: var(--text);
}

.section-subtitle {
  color: var(--text-light);
  font-size: 1.1rem;
  max-width: 600px;
  margin-bottom: 48px;
}

.bg-light {
  background: var(--bg-light);
}

/* Cards */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 28px;
}

.card {
  background: white;
  border-radius: 12px;
  padding: 32px;
  border: 1px solid var(--border);
  transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 30px rgba(0,0,0,0.08);
}

.card-icon {
  width: 56px;
  height: 56px;
  background: #e6f4f6;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin-bottom: 20px;
  color: var(--primary);
}

.card h3 {
  font-size: 1.25rem;
  margin-bottom: 12px;
}

.card p {
  color: var(--text-light);
  font-size: 0.98rem;
}

/* Research focus boxes */
.focus-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.focus-item {
  background: white;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--border);
}

.focus-item img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  background: #dceef1;
}

.focus-content {
  padding: 28px;
}

/* CTA Banner */
.cta-banner {
  background: var(--primary);
  color: white;
  padding: 70px 0;
  text-align: center;
}

.cta-banner h2 {
  font-size: 2rem;
  margin-bottom: 16px;
}

.cta-banner p {
  opacity: 0.9;
  margin-bottom: 28px;
  font-size: 1.15rem;
}

/* ===== Footer ===== */
.footer {
  background: #0a2e36;
  color: #c5d4d8;
  padding: 60px 0 30px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer h4 {
  color: white;
  margin-bottom: 18px;
  font-size: 1.05rem;
}

.footer a {
  display: block;
  margin-bottom: 10px;
  font-size: 0.95rem;
  transition: color 0.2s;
}

.footer a:hover {
  color: white;
}

.footer-bottom {
  border-top: 1px solid #1a454f;
  padding-top: 24px;
  font-size: 0.9rem;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

/* ===== Contact Form ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 50px;
  align-items: start;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-weight: 600;
  margin-bottom: 6px;
  font-size: 0.95rem;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 13px 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
  font-family: inherit;
  transition: border-color 0.2s;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
}

.form-group textarea {
  min-height: 140px;
  resize: vertical;
}

/* Thank you modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.55);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 20px;
}

.modal-overlay.active {
  display: flex;
}

.modal {
  background: white;
  border-radius: 16px;
  padding: 40px;
  max-width: 420px;
  width: 100%;
  text-align: center;
  box-shadow: 0 20px 50px rgba(0,0,0,0.2);
}

.modal-icon {
  width: 70px;
  height: 70px;
  background: #e6f7ed;
  color: #0d8a4c;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  margin: 0 auto 20px;
}

.modal h3 {
  font-size: 1.5rem;
  margin-bottom: 12px;
}

.modal p {
  color: var(--text-light);
  margin-bottom: 28px;
}

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .nav {
    display: none;
  }
  .menu-toggle {
    display: block;
  }
  .hero h1 {
    font-size: 2.1rem;
  }
  .contact-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .header-inner {
    height: 70px;
  }
}

@media (max-width: 600px) {
  .hero {
    padding: 60px 0 70px;
  }
  .section {
    padding: 50px 0;
  }
}