/* ============================================
   Mathias Unberath — Personal Homepage
   Minimal, modern, responsive
   ============================================ */

/* --- Design Tokens --- */
:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #111118;
  --bg-card: rgba(255, 255, 255, 0.03);
  --text-primary: #e8e4df;
  --text-secondary: #9a958e;
  --text-muted: #5c5850;
  --accent: #0077d8;
  --accent-glow: rgba(0, 119, 216, 0.12);
  --border-subtle: rgba(255, 255, 255, 0.06);
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-display: 'Instrument Serif', 'Georgia', serif;
  --max-width: 700px;
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 3.5rem;
  --space-xl: 6rem;
}

/* --- Reset & Base --- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  min-height: 100vh;
  overflow-x: hidden;
}

::selection {
  background: var(--accent);
  color: var(--bg-primary);
}

/* --- Layout --- */
.page-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100vh;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  padding: 0 var(--space-md);
}

/* --- Fade-in Animation --- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate {
  opacity: 0;
  animation: fadeInUp 0.7s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.25s; }
.delay-3 { animation-delay: 0.4s; }
.delay-4 { animation-delay: 0.55s; }
.delay-5 { animation-delay: 0.7s; }

/* --- Header / Identity --- */
.site-header {
  padding-top: clamp(var(--space-lg), 8vw, var(--space-xl));
  padding-bottom: var(--space-md);
  text-align: center;
}

.site-name {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 6vw, 3.6rem);
  font-weight: 400;
  letter-spacing: -0.01em;
  line-height: 1.1;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
}

.site-title {
  font-size: clamp(0.85rem, 2vw, 1rem);
  font-weight: 400;
  color: var(--text-secondary);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.site-title a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.3s ease;
}

.site-title a:hover {
  color: var(--text-primary);
}

/* --- Profile Photo --- */
.photo-section {
  padding: var(--space-md) 0;
  display: flex;
  justify-content: center;
}

.photo-wrapper {
  position: relative;
  width: 100%;
  max-width: 380px;
  border-radius: 16px;
  overflow: hidden;
}

.photo-wrapper::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 40%;
  background: linear-gradient(to top, var(--bg-primary) 0%, transparent 100%);
  pointer-events: none;
}

.photo-wrapper img {
  width: 100%;
  height: auto;
  display: block;
  filter: grayscale(10%) contrast(1.02);
  transition: filter 0.5s ease;
}

.photo-wrapper:hover img {
  filter: grayscale(0%) contrast(1.05);
}

/* --- Bio Section --- */
.bio-section {
  padding: var(--space-sm) 0 var(--space-lg);
}

.bio-section p {
  font-size: clamp(0.95rem, 2.2vw, 1.05rem);
  color: var(--text-primary);
  line-height: 1.8;
  margin-bottom: var(--space-sm);
}

.bio-section p:last-child {
  margin-bottom: 0;
}

.bio-section a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease, color 0.3s ease;
}

.bio-section a:hover {
  border-bottom-color: var(--accent);
}

.bio-section strong {
  color: var(--text-primary);
  font-weight: 600;
}

/* --- Lab Photo Strip --- */
.lab-photo-section {
  padding: var(--space-md) 0;
  width: 100%;
  display: flex;
  justify-content: center;
}

.lab-photo-wrapper {
  position: relative;
  width: 100%;
  max-width: var(--max-width);
  border-radius: 12px;
  overflow: hidden;
}

.lab-photo-wrapper::before,
.lab-photo-wrapper::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  height: 30%;
  z-index: 1;
  pointer-events: none;
}

.lab-photo-wrapper::before {
  top: 0;
  background: linear-gradient(to bottom, var(--bg-primary) 0%, transparent 100%);
}

.lab-photo-wrapper::after {
  bottom: 0;
  background: linear-gradient(to top, var(--bg-primary) 0%, transparent 100%);
}

.lab-photo-wrapper img {
  width: 100%;
  height: auto;
  display: block;
  filter: grayscale(15%) contrast(1.02);
  transition: filter 0.6s ease;
}

.lab-photo-wrapper:hover img {
  filter: grayscale(0%) contrast(1.05);
}

.lab-photo-caption {
  position: absolute;
  bottom: 12px;
  left: 0;
  right: 0;
  text-align: center;
  z-index: 2;
  font-size: 0.78rem;
  color: var(--text-muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  opacity: 0;
  transition: opacity 0.4s ease;
}

.lab-photo-wrapper:hover .lab-photo-caption {
  opacity: 1;
}

/* --- Links Section --- */
.links-section {
  padding: var(--space-md) 0 var(--space-lg);
}

.links-grid {
  display: flex;
  flex-direction: column;
  gap: 1px;
  background: var(--border-subtle);
  border-radius: 12px;
  overflow: hidden;
}

.link-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: clamp(0.9rem, 2.5vw, 1.15rem) var(--space-md);
  background: var(--bg-card);
  color: var(--text-primary);
  text-decoration: none;
  transition: background 0.3s ease, color 0.3s ease;
  position: relative;
}

.link-item:hover {
  background: var(--accent-glow);
}

.link-item:hover .link-icon {
  color: var(--accent);
}

.link-item:hover .link-arrow {
  opacity: 1;
  transform: translateX(0);
}

.link-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  flex-shrink: 0;
  color: var(--text-secondary);
  transition: color 0.3s ease;
}

.link-icon svg {
  width: 20px;
  height: 20px;
}

.link-label {
  flex: 1;
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 0.01em;
}

.link-description {
  display: block;
  font-size: 0.78rem;
  font-weight: 400;
  color: var(--text-secondary);
  margin-top: 2px;
}

.link-arrow {
  color: var(--text-muted);
  opacity: 0;
  transform: translateX(-6px);
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.link-arrow svg {
  width: 16px;
  height: 16px;
}

/* --- Divider --- */
.divider {
  width: 48px;
  height: 1px;
  background: var(--border-subtle);
  margin: 0 auto;
}

/* --- Footer --- */
.site-footer {
  padding: var(--space-lg) 0 var(--space-md);
  text-align: center;
}

.footer-email a {
  font-size: 0.9rem;
  color: var(--text-secondary);
  text-decoration: none;
  letter-spacing: 0.02em;
  transition: color 0.3s ease;
}

.footer-email a:hover {
  color: var(--accent);
}

.footer-copy {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: var(--space-sm);
}

/* --- Responsive --- */
@media (max-width: 600px) {
  .container {
    padding: 0 var(--space-sm);
  }

  .photo-wrapper {
    max-width: 280px;
    border-radius: 12px;
  }

  .link-item {
    padding: 0.85rem var(--space-sm);
  }

  .link-icon {
    width: 30px;
    height: 30px;
  }

  .link-icon svg {
    width: 18px;
    height: 18px;
  }

  .link-arrow {
    opacity: 0.5;
    transform: translateX(0);
  }
}

@media (max-width: 380px) {
  .site-name {
    font-size: 2rem;
  }

  .bio-section p {
    font-size: 0.9rem;
  }
}

/* --- Print --- */
@media print {
  body {
    background: #fff;
    color: #000;
  }

  .photo-wrapper::after,
  .lab-photo-wrapper::before,
  .lab-photo-wrapper::after,
  .link-arrow {
    display: none;
  }

  .link-item {
    border-bottom: 1px solid #ccc;
  }
}