/* ==========================================================================
   Christos Theodoropoulos - Personal Website
   Modern redesign - 2026
   ========================================================================== */

/* ---------- CSS Custom Properties ---------- */
:root {
  /* Colors */
  --color-primary: #1a1a2e;
  --color-accent: #0891b2;
  --color-accent-light: #06b6d4;
  --color-accent-bg: rgba(8, 145, 178, 0.08);
  --color-bg: #ffffff;
  --color-bg-alt: #f8fafc;
  --color-bg-card: #ffffff;
  --color-text: #334155;
  --color-text-muted: #64748b;
  --color-text-heading: #0f172a;
  --color-border: #e2e8f0;
  --color-border-light: #f1f5f9;
  --color-nav-bg: rgba(255, 255, 255, 0.85);
  --color-nav-text: #334155;
  --color-footer-bg: #0f172a;
  --color-footer-text: #94a3b8;
  --color-shadow: rgba(0, 0, 0, 0.06);
  --color-shadow-lg: rgba(0, 0, 0, 0.1);
  --color-timeline-line: #e2e8f0;
  --color-timeline-dot: #0891b2;
  --color-badge-bg: #f0f9ff;
  --color-badge-text: #0369a1;

  /* Typography */
  --font-heading: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-body: 'Source Sans 3', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Sizing */
  --container-max: 1100px;
  --container-narrow: 800px;
  --nav-height: 64px;
  --section-padding: clamp(60px, 8vw, 120px);
  --radius: 12px;
  --radius-sm: 8px;
  --radius-xs: 4px;

  /* Transitions */
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ---------- Dark Mode ---------- */
[data-theme="dark"] {
  --color-primary: #e2e8f0;
  --color-accent: #22d3ee;
  --color-accent-light: #67e8f9;
  --color-accent-bg: rgba(34, 211, 238, 0.1);
  --color-bg: #0f172a;
  --color-bg-alt: #1e293b;
  --color-bg-card: #1e293b;
  --color-text: #cbd5e1;
  --color-text-muted: #94a3b8;
  --color-text-heading: #f1f5f9;
  --color-border: #334155;
  --color-border-light: #1e293b;
  --color-nav-bg: rgba(15, 23, 42, 0.9);
  --color-nav-text: #cbd5e1;
  --color-footer-bg: #020617;
  --color-footer-text: #64748b;
  --color-shadow: rgba(0, 0, 0, 0.2);
  --color-shadow-lg: rgba(0, 0, 0, 0.4);
  --color-timeline-line: #334155;
  --color-timeline-dot: #22d3ee;
  --color-badge-bg: rgba(34, 211, 238, 0.1);
  --color-badge-text: #67e8f9;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
  -webkit-text-size-adjust: 100%;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover,
a:focus {
  color: var(--color-accent-light);
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--color-text-heading);
  font-weight: 700;
  line-height: 1.3;
}

::selection {
  background: var(--color-accent);
  color: #fff;
}

/* ---------- Utilities ---------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

.container--narrow {
  max-width: var(--container-narrow);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.section {
  padding: var(--section-padding) 0;
}

.section--alt {
  background-color: var(--color-bg-alt);
}

.section__title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  margin-bottom: 48px;
  position: relative;
  display: inline-block;
}

.section__title::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  width: 40px;
  height: 3px;
  background: var(--color-accent);
  border-radius: 2px;
}

/* ---------- Scroll Animations ---------- */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Navigation ---------- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: var(--color-nav-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  transition: box-shadow var(--transition);
}

@media (max-width: 768px) {
  .nav {
    height: auto;
    min-height: var(--nav-height);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    background: var(--color-bg);
  }
}

.nav--scrolled {
  box-shadow: 0 1px 8px var(--color-shadow);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

@media (max-width: 768px) {
  .nav__inner {
    flex-wrap: wrap;
    min-height: var(--nav-height);
    height: auto;
  }
}

.nav__brand {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-text-heading);
  text-decoration: none;
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  white-space: nowrap;
}

.nav__brand:hover,
.nav__brand:focus {
  color: var(--color-accent);
}

.nav__initials {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--color-accent);
  color: #fff;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.nav__menu {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
}

.nav__links a {
  font-family: var(--font-heading);
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--color-nav-text);
  text-decoration: none;
  padding: 6px 10px;
  border-radius: var(--radius-xs);
  white-space: nowrap;
  transition: color var(--transition), background var(--transition);
}

.nav__links a:hover,
.nav__links a:focus,
.nav__links a.active {
  color: var(--color-accent);
  background: var(--color-accent-bg);
}

.nav__right {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-left: 8px;
}

.nav__theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: all var(--transition);
  font-size: 1.1rem;
}

.nav__theme-toggle:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
  background: var(--color-accent-bg);
}

.nav__cv-link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-family: var(--font-heading);
  font-size: 0.82rem;
  font-weight: 600;
  color: #fff !important;
  background: var(--color-accent);
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  white-space: nowrap;
  transition: background var(--transition), transform var(--transition);
}

.nav__cv-link:hover {
  background: var(--color-accent-light);
  color: #fff !important;
  transform: translateY(-1px);
}

/* Mobile nav toggle */
.nav__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  border: none;
  background: transparent;
  cursor: pointer;
  padding: 6px;
}

.nav__toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all var(--transition);
}

.nav__toggle.is-active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav__toggle.is-active span:nth-child(2) {
  opacity: 0;
}

.nav__toggle.is-active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

@media (max-width: 768px) {
  .nav__toggle {
    display: flex;
  }

  .nav__brand span:not(.nav__initials) {
    display: none;
  }

  .nav__menu {
    display: none;
    flex-direction: column;
    align-items: stretch;
    width: 100%;
    padding: 8px 0 16px;
    border-top: 1px solid var(--color-border);
  }

  .nav__menu.is-open {
    display: flex;
  }

  .nav__links {
    flex-direction: column;
    gap: 4px;
  }

  .nav__links a {
    display: block;
    padding: 12px 16px;
    font-size: 1rem;
    border-radius: var(--radius-sm);
  }

  .nav__right {
    margin-top: 16px;
    margin-left: 0;
    padding-top: 16px;
    border-top: 1px solid var(--color-border);
    justify-content: flex-start;
    gap: 12px;
  }

  .nav__cv-link {
    font-size: 0.9rem;
    padding: 10px 20px;
  }

  .nav__theme-toggle {
    width: 42px;
    height: 42px;
  }
}

/* ---------- Hero / About Section ---------- */
.hero {
  padding-top: calc(var(--nav-height) + var(--section-padding));
  padding-bottom: var(--section-padding);
}

.hero__grid {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 48px;
  align-items: start;
}

.hero__photo-card {
  text-align: center;
  position: sticky;
  top: calc(var(--nav-height) + 32px);
}

.hero__photo {
  width: 220px;
  height: 220px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--color-border);
  box-shadow: 0 8px 32px var(--color-shadow-lg);
  margin: 0 auto 20px;
}

.hero__name {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 4px;
  color: var(--color-text-heading);
}

.hero__title {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  margin-bottom: 20px;
  line-height: 1.5;
}

.hero__social {
  display: flex;
  justify-content: center;
  gap: 12px;
  list-style: none;
}

.hero__social a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: 1.1rem;
  transition: all var(--transition);
}

.hero__social a:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
  background: var(--color-accent-bg);
  transform: translateY(-2px);
}

.hero__greeting {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  color: var(--color-text-heading);
  margin-bottom: 24px;
}

.hero__greeting span {
  color: var(--color-accent);
}

.hero__bio {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--color-text);
}

.hero__bio p {
  margin-bottom: 16px;
}

.hero__bio a {
  font-weight: 600;
}

.hero__bio-collapsed {
  max-height: 480px;
  overflow: hidden;
  position: relative;
  transition: max-height 0.6s ease;
}

.hero__bio-collapsed::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 100px;
  background: linear-gradient(transparent, var(--color-bg));
  pointer-events: none;
  transition: opacity var(--transition);
}

.hero__bio-collapsed.is-expanded {
  max-height: 3000px;
}

.hero__bio-collapsed.is-expanded::after {
  opacity: 0;
}

.hero__read-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 12px;
  padding: 8px 20px;
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-accent);
  background: var(--color-accent-bg);
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
}

.hero__read-more:hover {
  background: var(--color-accent);
  color: #fff;
}

.hero__read-more .icon {
  transition: transform var(--transition);
  font-size: 0.75rem;
}

.hero__read-more.is-expanded .icon {
  transform: rotate(180deg);
}

@media (max-width: 768px) {
  .hero {
    padding-top: calc(var(--nav-height) + 32px);
    padding-bottom: 40px;
  }

  .hero__grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .hero__photo-card {
    position: static;
  }

  .hero__photo {
    width: 150px;
    height: 150px;
  }

  .hero__name {
    font-size: 1.25rem;
  }

  .hero__title {
    font-size: 0.9rem;
  }

  .hero__greeting {
    font-size: 1.4rem;
    text-align: center;
  }

  .hero__bio {
    font-size: 0.95rem;
  }

  .hero__bio-collapsed {
    max-height: 320px;
  }
}

@media (max-width: 400px) {
  .hero__photo {
    width: 120px;
    height: 120px;
  }

  .hero__social {
    gap: 8px;
  }

  .hero__social a {
    width: 36px;
    height: 36px;
    font-size: 1rem;
  }
}

/* ---------- Experience Section ---------- */
.experience__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

.experience__column h3 {
  font-size: 1.15rem;
  margin-bottom: 32px;
  color: var(--color-text-heading);
  display: flex;
  align-items: center;
  gap: 10px;
}

.experience__column h3 .icon {
  color: var(--color-accent);
  font-size: 1.2rem;
}

/* Timeline */
.timeline {
  position: relative;
  padding-left: 32px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--color-timeline-line);
}

.timeline__item {
  position: relative;
  padding-bottom: 28px;
}

.timeline__item:last-child {
  padding-bottom: 0;
}

.timeline__item::before {
  content: '';
  position: absolute;
  left: -28px;
  top: 8px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-bg);
  border: 3px solid var(--color-timeline-dot);
  z-index: 1;
  transition: all var(--transition);
}

.timeline__item:hover::before {
  background: var(--color-timeline-dot);
  box-shadow: 0 0 0 4px var(--color-accent-bg);
}

.timeline__date {
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-accent);
  margin-bottom: 4px;
  letter-spacing: 0.02em;
}

.timeline__card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 16px;
  transition: all var(--transition);
}

.timeline__card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 4px 16px var(--color-shadow);
}

.timeline__logo {
  height: 32px;
  width: auto;
  max-width: 100px;
  object-fit: contain;
  margin-bottom: 8px;
  opacity: 0.85;
  transition: opacity var(--transition);
}

[data-theme="dark"] .timeline__logo {
  filter: brightness(1.3) contrast(0.9);
}

.timeline__card:hover .timeline__logo {
  opacity: 1;
}

.timeline__org {
  font-family: var(--font-heading);
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 2px;
}

.timeline__org a {
  color: var(--color-text-heading);
}

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

.timeline__role {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.experience__cta {
  text-align: center;
  margin-top: 40px;
}

.experience__cta a {
  font-family: var(--font-heading);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-accent);
}

@media (max-width: 768px) {
  .experience__grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .experience__column h3 {
    font-size: 1.05rem;
    margin-bottom: 24px;
  }

  .timeline {
    padding-left: 24px;
  }

  .timeline__item::before {
    left: -20px;
    width: 10px;
    height: 10px;
  }

  .timeline__card {
    padding: 12px;
  }

  .timeline__logo {
    height: 26px;
  }

  .timeline__org {
    font-size: 0.85rem;
  }

  .timeline__role {
    font-size: 0.8rem;
  }
}

/* ---------- News Section ---------- */
.news__list {
  list-style: none;
  max-width: var(--container-narrow);
}

.news__item {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 20px;
  padding: 20px 0;
  border-bottom: 1px solid var(--color-border-light);
  transition: all var(--transition);
}

.news__item:last-child {
  border-bottom: none;
}

.news__date {
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-accent);
  padding-top: 2px;
}

.news__content {
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--color-text);
}

.news__content a {
  font-weight: 600;
}

.news__year-divider {
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 24px 0 8px;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 8px;
}

/* ---------- Publications Section ---------- */
.pub__year {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-text-heading);
  margin-top: 40px;
  margin-bottom: 20px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-border);
}

.pub__year:first-of-type {
  margin-top: 0;
}

.pub__item {
  padding: 20px;
  margin-bottom: 16px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

.pub__item:hover {
  border-color: var(--color-accent);
  box-shadow: 0 4px 16px var(--color-shadow);
}

.pub__title {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-text-heading);
  margin-bottom: 6px;
  line-height: 1.4;
}

.pub__authors {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: 6px;
  line-height: 1.5;
}

.pub__authors strong {
  color: var(--color-text);
  font-weight: 600;
}

.pub__venue {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  font-style: italic;
  margin-bottom: 12px;
}

.pub__links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.pub__link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-family: var(--font-heading);
  font-size: 0.78rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: var(--radius-xs);
  background: var(--color-badge-bg);
  color: var(--color-badge-text);
  transition: all var(--transition);
}

.pub__link:hover {
  background: var(--color-accent);
  color: #fff;
}

/* ---------- Contact Section ---------- */
.contact {
  background: var(--color-footer-bg);
  color: #cbd5e1;
}

.contact .section__title {
  color: #f1f5f9;
}

.contact .section__title::after {
  background: var(--color-accent);
}

.contact__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  max-width: var(--container-narrow);
}

.contact__name-greek {
  font-size: 1.1rem;
  font-weight: 600;
  color: #e2e8f0;
  margin-bottom: 20px;
}

.contact__item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 16px;
  font-size: 0.95rem;
}

.contact__item i {
  color: var(--color-accent);
  font-size: 1rem;
  margin-top: 3px;
  width: 20px;
  text-align: center;
  flex-shrink: 0;
}

.contact__item a {
  color: #cbd5e1;
}

.contact__item a:hover {
  color: var(--color-accent-light);
}

.contact__pronunciation {
  margin-top: 24px;
}

.contact__pronunciation p {
  font-size: 0.9rem;
  color: #94a3b8;
  margin-bottom: 12px;
}

.contact__pronunciation a {
  color: var(--color-accent-light);
}

.contact__pronunciation audio {
  width: 100%;
  max-width: 280px;
  height: 36px;
  border-radius: var(--radius-sm);
}

@media (max-width: 768px) {
  .news__item {
    grid-template-columns: 64px 1fr;
    gap: 12px;
    padding: 16px 0;
  }

  .news__date {
    font-size: 0.78rem;
  }

  .news__content {
    font-size: 0.9rem;
  }

  .news__year-divider {
    padding: 16px 0 6px;
  }

  .pub__item {
    padding: 16px;
  }

  .pub__title {
    font-size: 0.92rem;
  }

  .pub__authors {
    font-size: 0.82rem;
  }

  .pub__venue {
    font-size: 0.8rem;
  }

  .pub__links {
    gap: 6px;
  }

  .pub__link {
    font-size: 0.72rem;
    padding: 4px 10px;
  }

  .contact__grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .contact__name-greek {
    font-size: 1rem;
  }

  .contact__item {
    font-size: 0.85rem;
    word-break: break-word;
  }

  .footer__inner {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }

  .footer__copyright {
    font-size: 0.8rem;
  }

  .section__title {
    font-size: 1.3rem;
    margin-bottom: 32px;
  }

  .container {
    padding: 0 16px;
  }
}

@media (max-width: 400px) {
  .news__item {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .news__date {
    font-size: 0.75rem;
  }

  .container {
    padding: 0 12px;
  }
}

/* ---------- Footer ---------- */
.footer {
  background: var(--color-footer-bg);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding: 24px 0;
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.footer__copyright {
  font-size: 0.85rem;
  color: var(--color-footer-text);
}

.footer__social {
  display: flex;
  gap: 12px;
  list-style: none;
}

.footer__social a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  color: var(--color-footer-text);
  transition: all var(--transition);
  font-size: 1rem;
}

.footer__social a:hover {
  color: var(--color-accent-light);
  background: rgba(255, 255, 255, 0.05);
}

/* ---------- Back to Top ---------- */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-accent);
  color: #fff;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  box-shadow: 0 4px 12px rgba(8, 145, 178, 0.3);
  opacity: 0;
  transform: translateY(16px);
  pointer-events: none;
  transition: all var(--transition);
  z-index: 100;
}

.back-to-top.is-visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.back-to-top:hover {
  background: var(--color-accent-light);
  transform: translateY(-2px);
}

@media (max-width: 768px) {
  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
    font-size: 1rem;
  }
}

/* ---------- Print Styles ---------- */
@media print {
  .nav,
  .back-to-top,
  .nav__theme-toggle,
  .hero__read-more {
    display: none !important;
  }

  body {
    font-size: 12pt;
    color: #000;
    background: #fff;
  }

  .hero {
    padding-top: 0;
  }

  .hero__bio-collapsed {
    max-height: none;
  }

  .hero__bio-collapsed::after {
    display: none;
  }

  .section {
    padding: 24pt 0;
    break-inside: avoid;
  }

  a {
    color: #000;
    text-decoration: underline;
  }

  .contact {
    background: #fff;
    color: #000;
  }
}