* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--color-bg-secondary);
  color: var(--color-text-primary);
}

a {
  color: var(--primary-color);
}

a:hover {
  color: var(--primary-color-dark);
}

/* Language visibility */
.lang-en .fi { display: none; }
.lang-fi .en { display: none; }

/* Header / Navigation */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 2rem;
  background: var(--color-bg-primary);
  border-bottom: 1px solid var(--color-border-light);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-logos {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.header-utu-logo {
  display: block;
  width: min(5rem, 20vw);
  height: auto;
}

.header-utu-uni-logo {
  display: block;
  width: min(14rem, 40vw);
  height: auto;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.nav-link {
  color: var(--color-text-primary);
  text-decoration: none;
  font-family: var(--font-family-content);
  font-weight: 600;
  font-size: 0.95rem;
}

.nav-link:hover,
.nav-link[aria-current="page"] {
  color: var(--primary-color);
}

.lang-toggle {
  background: none;
  border: 2px solid var(--primary-color);
  color: var(--primary-color);
  font-family: var(--font-family-content);
  font-weight: 700;
  font-size: 0.875rem;
  padding: 0.25rem 0.625rem;
  cursor: pointer;
  line-height: 1.4;
}

.lang-toggle:hover {
  background: var(--primary-color);
  color: var(--color-white);
}

/* Front page hero */
.hero-utu-logo {
  display: block;
  width: min(18rem, 100%);
  height: auto;
  margin-bottom: 3rem;
}

.hero {
  max-width: 44rem;
  margin: 0 auto;
  padding: 4rem 2rem;
}

h1 {
  margin: 0 0 1.5rem;
  color: var(--primary-color);
  font-size: clamp(2.5rem, 8vw, 5rem);
  font-weight: 700;
  line-height: 1;
}

h2 {
  margin: 2rem 0 1rem;
  color: var(--primary-color);
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 600;
}

p {
  max-width: 36rem;
  margin: 0 0 0.75rem;
  color: var(--color-text-secondary);
  font-size: 1.125rem;
  line-height: 1.6;

}

.button {
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
  margin-top: 1.5rem;
  padding: 0.75rem 1rem;
  border: 2px solid var(--primary-color);
  background: var(--primary-color);
  color: var(--color-text-on-dark);
  font-weight: 700;
  line-height: 1.2;
  text-decoration: none;
}

.button:hover,
.button:focus-visible {
  background: var(--primary-color-dark);
  border-color: var(--primary-color-dark);
}

/* Footer */
.site-footer {
  display: flex;
  align-items: center;
  gap: 2rem;
  padding: 2rem;
  border-top: 1px solid var(--color-border-light);
  margin-top: 2rem;
  background: var(--color-white);
}

.footer-utu-logo {
  display: block;
  width: min(5rem, 15vw);
  height: auto;
}

.site-footer a {
  color: var(--primary-color);
  text-decoration: none;
  font-size: 0.95rem;
}

.site-footer a:hover {
  text-decoration: underline;
}

/* Content pages (about, personnel) */
.content-page {
  max-width: 44rem;
  margin: 0 auto;
  padding: 3rem 2rem;
}

/* About page */
.lab-logo {
  display: block;
  width: min(22rem, 100%);
  height: auto;
  margin-bottom: 2.5rem;
}

.lab-photo {
  display: block;
  width: 100%;
  height: auto;
  margin: 2rem 0;
}

.lab-photo-small {
  display: block;
  width: 70%;
  height: auto;
  margin: 1.5rem 0;
}

/* Personnel page */
.personnel-list {
  list-style: none;
  padding: 0;
  margin: 0 0 3rem;
}

.personnel-item {
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--color-border-light);
}

.personnel-item:first-child {
  border-top: 1px solid var(--color-border-light);
}

.personnel-name {
  font-family: var(--font-family-heading);
  font-weight: 600;
  font-size: 1.1rem;
  margin: 0 0 0.25rem;
  color: var(--color-text-primary);
}

.personnel-title {
  margin: 0;
  color: var(--color-text-secondary);
  font-size: 0.95rem;
}

.contact-section {
  padding: 2rem;
  background: var(--color-bg-primary);
  border: 1px solid var(--color-border-light);
}

.contact-section p {
  margin: 0 0 0.5rem;
}

.contact-section a {
  color: var(--primary-color);
}