/* ========================================
   Personal Portfolio - Styles
   Inspired by hallabro-kokko.se
   ======================================== */

/* ===== CSS Custom Properties ===== */
:root {
  /* Colors - Light Mode */
  --bg-primary: #fafafa;
  --bg-secondary: #f4f4f5;
  --text-primary: #27272a;
  --text-secondary: #52525b;
  --text-muted: #a1a1aa;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --border: #e4e4e7;
  --card-bg: #ffffff;
  --card-shadow: rgba(0, 0, 0, 0.05);
  --card-shadow-hover: rgba(0, 0, 0, 0.1);

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Typography */
  --font-sans: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;

  /* Layout */
  --container-max: 1100px;
  --header-height: 4rem;

  /* Borders & Shadows */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
}

/* Dark Mode */
@media (prefers-color-scheme: dark) {
  :root {
    --bg-primary: #09090b;
    --bg-secondary: #18181b;
    --text-primary: #f4f4f5;
    --text-secondary: #a1a1aa;
    --text-muted: #71717a;
    --border: #27272a;
    --card-bg: #18181b;
    --card-shadow: rgba(0, 0, 0, 0.2);
    --card-shadow-hover: rgba(0, 0, 0, 0.4);
  }
}

/* ===== CSS Reset ===== */
*,
*::before,
*::after {
  box-sizing: border-box;
}

* {
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + var(--space-8));
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

ul, ol {
  list-style: none;
}

/* ===== Accessibility ===== */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  padding: var(--space-2) var(--space-4);
  background: var(--text-primary);
  color: var(--bg-primary);
  border-radius: var(--radius-md);
  z-index: 1000;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: var(--space-4);
}

/* Respect reduced motion preference */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ===== Layout ===== */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

@media (max-width: 640px) {
  .container {
    padding: 0 var(--space-4);
  }
}

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

.nav {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  height: 100%;
}

.nav__logo {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--text-primary);
  transition: color var(--transition-fast);
  justify-self: start;
}

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

.nav__links {
  display: flex;
  gap: var(--space-8);
  justify-self: center;
}

.nav__links a {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

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

.nav__links a.is-active {
  color: var(--text-primary);
}

/* Mobile nav */
@media (max-width: 640px) {
  .nav__links {
    gap: var(--space-4);
  }

  .nav__links a {
    font-size: var(--text-xs);
  }
}

/* ===== Sections ===== */
.section {
  padding: var(--space-24) 0;
}

.section--hero {
  padding: var(--space-20) 0 var(--space-24);
}

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

@media (max-width: 768px) {
  .section {
    padding: var(--space-16) 0;
  }

  .section--hero {
    padding: var(--space-12) 0 var(--space-16);
  }
}

.section__header {
  margin-bottom: var(--space-12);
}

.section__title {
  font-size: var(--text-2xl);
  font-weight: 600;
  color: var(--text-primary);
}

/* ===== Hero / About ===== */
.hero {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--space-16);
  align-items: start;
}

@media (max-width: 768px) {
  .hero {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }
}

.hero__content {
  max-width: 600px;
}

.hero__title {
  font-size: var(--text-5xl);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.025em;
  margin-bottom: var(--space-4);
}

@media (max-width: 768px) {
  .hero__title {
    font-size: var(--text-4xl);
  }
}

.hero__subtitle {
  font-size: var(--text-xl);
  color: var(--text-secondary);
  margin-bottom: var(--space-6);
}

.hero__bio {
  font-size: var(--text-lg);
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: var(--space-6);
}

.hero__education {
  margin-bottom: var(--space-6);
}

.hero__education-item {
  font-size: var(--text-sm);
  color: var(--text-muted);
  margin-bottom: var(--space-1);
}

.hero__cv-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--accent);
  padding: var(--space-2) var(--space-4);
  border: 1px solid var(--accent);
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.hero__cv-link:hover {
  background: var(--accent);
  color: white;
}

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

.hero__image {
  position: relative;
}

.hero__photo {
  width: 200px;
  height: 200px;
  border-radius: var(--radius-xl);
  object-fit: cover;
  transform: rotate(3deg);
  box-shadow: 0 10px 30px var(--card-shadow);
  transition: transform var(--transition-base);
}

.hero__photo:hover {
  transform: rotate(0deg);
}

@media (max-width: 768px) {
  .hero {
    text-align: center;
  }

  .hero__content {
    max-width: none;
    order: 2;
  }

  .hero__image {
    order: 1;
    display: flex;
    justify-content: center;
  }

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

/* Photo placeholder */
.hero__photo-placeholder {
  width: 200px;
  height: 200px;
  border-radius: var(--radius-xl);
  background: var(--bg-secondary);
  border: 2px dashed var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  transform: rotate(3deg);
  transition: transform var(--transition-base);
}

.hero__photo-placeholder:hover {
  transform: rotate(0deg);
}

.hero__photo-placeholder svg {
  width: 64px;
  height: 64px;
  color: var(--text-muted);
}

@media (max-width: 768px) {
  .hero__photo-placeholder {
    width: 150px;
    height: 150px;
  }

  .hero__photo-placeholder svg {
    width: 48px;
    height: 48px;
  }
}

/* ===== Projects ===== */
.projects__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-8);
}

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

.project-card {
  position: relative;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.project-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 40px var(--card-shadow-hover);
}

.project-card__image {
  aspect-ratio: 16 / 10;
  background: var(--bg-secondary);
  overflow: hidden;
}

.project-card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-base);
}

.project-card:hover .project-card__image img {
  transform: scale(1.02);
}

/* Image placeholder */
.project-card__placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-secondary);
}

.project-card__placeholder svg {
  width: 48px;
  height: 48px;
  color: var(--text-muted);
}

.project-card__content {
  padding: var(--space-6);
}

.project-card__title {
  font-size: var(--text-xl);
  font-weight: 600;
  margin-bottom: var(--space-2);
}

.project-card__description {
  font-size: var(--text-base);
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-4);
}

.project-card__tech {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.project-card__tech li {
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--text-muted);
  background: var(--bg-secondary);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
}

.project-card__links {
  display: flex;
  gap: var(--space-4);
}

.project-card__link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  transition: color var(--transition-fast);
}

.project-card__link:hover {
  color: var(--accent-hover);
}

.project-card__link--secondary {
  color: var(--text-secondary);
}

.project-card__link--secondary:hover {
  color: var(--text-primary);
}

/* ===== Publications ===== */
.publications__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

.publication-card {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: var(--space-6);
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  padding: var(--space-6);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.publication-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 30px var(--card-shadow-hover);
}

@media (max-width: 640px) {
  .publication-card {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }
}

.publication-card__image {
  aspect-ratio: 3 / 4;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--bg-secondary);
}

.publication-card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.publication-card__content {
  display: flex;
  flex-direction: column;
}

.publication-card__type {
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent);
  margin-bottom: var(--space-2);
}

.publication-card__title {
  font-size: var(--text-lg);
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: var(--space-2);
}

.publication-card__meta {
  font-size: var(--text-sm);
  color: var(--text-muted);
  margin-bottom: var(--space-3);
}

.publication-card__description {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-4);
  flex-grow: 1;
}

.publication-card__links {
  display: flex;
  gap: var(--space-4);
}

/* Stagger animation for publications */
.publications__grid .publication-card:nth-child(1) { transition-delay: 0ms; }
.publications__grid .publication-card:nth-child(2) { transition-delay: 100ms; }
.publications__grid .publication-card:nth-child(3) { transition-delay: 200ms; }

/* ===== Contact ===== */
.contact {
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
}

.contact__intro {
  font-size: var(--text-lg);
  color: var(--text-secondary);
  margin-bottom: var(--space-8);
  line-height: 1.75;
}

.contact__list {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
}

.contact__link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-lg);
  font-weight: 500;
  color: var(--text-primary);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-lg);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.contact__link:hover {
  background: var(--bg-secondary);
  color: var(--accent);
}

.contact__icon {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.contact__icon svg {
  width: 20px;
  height: 20px;
}

/* ===== Footer ===== */
.site-footer {
  padding: var(--space-8) 0;
  border-top: 1px solid var(--border);
  text-align: center;
}

.footer__text {
  font-size: var(--text-sm);
  color: var(--text-muted);
}

/* ===== Scroll Animations ===== */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger animation delays for grid items */
.projects__grid .project-card:nth-child(1) { transition-delay: 0ms; }
.projects__grid .project-card:nth-child(2) { transition-delay: 100ms; }
.projects__grid .project-card:nth-child(3) { transition-delay: 200ms; }
.projects__grid .project-card:nth-child(4) { transition-delay: 300ms; }

/* ===== Blog Page ===== */
.blog-header {
  text-align: center;
  padding-bottom: var(--space-12);
}

.blog-header__title {
  font-size: var(--text-5xl);
  font-weight: 700;
  letter-spacing: -0.025em;
  margin-bottom: var(--space-4);
}

.blog-header__subtitle {
  font-size: var(--text-lg);
  color: var(--text-secondary);
}

.blog-posts {
  padding-top: 0;
}

/* Blog Post */
.blog-post {
  max-width: 800px;
  margin: 0 auto var(--space-24);
  padding-bottom: var(--space-24);
  border-bottom: 1px solid var(--border);
}

.blog-post:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.blog-post__header {
  margin-bottom: var(--space-8);
}

.blog-post__image {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--radius-xl);
  margin-bottom: var(--space-6);
}

.blog-post__meta {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

.blog-post__tag {
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent);
  background: var(--bg-secondary);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
}

.blog-post__date {
  font-size: var(--text-sm);
  color: var(--text-muted);
}

.blog-post__title {
  font-size: var(--text-3xl);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--space-2);
}

.blog-post__subtitle {
  font-size: var(--text-lg);
  color: var(--text-secondary);
}

/* Blog Post Content */
.blog-post__content {
  font-size: var(--text-base);
  line-height: 1.75;
  color: var(--text-primary);
}

.blog-post__content h3 {
  font-size: var(--text-xl);
  font-weight: 600;
  margin-top: var(--space-8);
  margin-bottom: var(--space-4);
}

.blog-post__content h3:first-child {
  margin-top: 0;
}

.blog-post__content p {
  margin-bottom: var(--space-4);
  color: var(--text-secondary);
}

.blog-post__content ul {
  margin-bottom: var(--space-4);
  padding-left: var(--space-6);
  list-style: disc;
}

.blog-post__content ul li {
  margin-bottom: var(--space-2);
  color: var(--text-secondary);
}

.blog-post__content a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}

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

.blog-post__content em {
  font-style: italic;
}

/* Code Blocks */
.blog-post__content code {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.875em;
  background: var(--bg-secondary);
  padding: 0.15em 0.4em;
  border-radius: var(--radius-sm);
  color: var(--text-primary);
}

.blog-post__content pre {
  margin: var(--space-4) 0;
  padding: var(--space-4);
  background: #1e1e1e;
  border-radius: var(--radius-lg);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.blog-post__content pre code {
  display: block;
  background: transparent;
  padding: 0;
  font-size: var(--text-sm);
  line-height: 1.6;
  color: #d4d4d4;
  white-space: pre;
}

/* Dark mode adjustments for code */
@media (prefers-color-scheme: dark) {
  .blog-post__content pre {
    background: #0d0d0d;
    border: 1px solid var(--border);
  }
}

/* Responsive adjustments for blog */
@media (max-width: 768px) {
  .blog-header__title {
    font-size: var(--text-4xl);
  }

  .blog-post__title {
    font-size: var(--text-2xl);
  }

  .blog-post {
    margin-bottom: var(--space-16);
    padding-bottom: var(--space-16);
  }
}

/* ===== Home Page Hero ===== */
.home-hero {
  text-align: center;
  padding-bottom: var(--space-16);
}

.home-hero__title {
  font-size: var(--text-5xl);
  font-weight: 700;
  letter-spacing: -0.025em;
  margin-bottom: var(--space-6);
}

.home-hero__intro {
  font-size: var(--text-lg);
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto var(--space-6);
  line-height: 1.75;
}

.home-hero__social {
  display: flex;
  justify-content: center;
  gap: var(--space-4);
}

.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  color: var(--text-secondary);
  border-radius: var(--radius-full);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.social-link:hover {
  color: var(--accent);
  background: var(--bg-secondary);
}

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

@media (max-width: 768px) {
  .home-hero__title {
    font-size: var(--text-4xl);
  }
}

/* ===== Photo Gallery ===== */
.photo-gallery {
  padding: var(--space-8) 0;
  overflow: hidden;
}

.photo-gallery__track {
  display: flex;
  justify-content: center;
  gap: var(--space-6);
  padding: var(--space-4) var(--space-6);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.photo-gallery__track::-webkit-scrollbar {
  display: none;
}

.photo-gallery__item {
  flex-shrink: 0;
  width: 180px;
  aspect-ratio: 9 / 10;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 10px 30px var(--card-shadow);
  transition: transform var(--transition-base);
}

.photo-gallery__item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.photo-gallery__item--rotate-right {
  transform: rotate(2deg);
}

.photo-gallery__item--rotate-left {
  transform: rotate(-2deg);
}

.photo-gallery__item:hover {
  transform: rotate(0deg) scale(1.02);
}

@media (max-width: 768px) {
  .photo-gallery__track {
    justify-content: flex-start;
  }

  .photo-gallery__item {
    width: 140px;
  }
}

/* ===== Recent Articles (Home Page) ===== */
.recent-articles {
  padding-top: var(--space-16);
}

.recent-articles__list {
  max-width: 700px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.article-card {
  padding: var(--space-6);
  border-radius: var(--radius-lg);
  transition: background-color var(--transition-fast), transform var(--transition-fast);
}

.article-card:hover {
  background: var(--bg-secondary);
  transform: scale(1.01);
}

.article-card__date {
  display: block;
  font-size: var(--text-sm);
  color: var(--text-muted);
  margin-bottom: var(--space-2);
}

.article-card__title {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-2);
}

.article-card__title a {
  color: var(--text-primary);
  transition: color var(--transition-fast);
}

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

.article-card__description {
  font-size: var(--text-base);
  color: var(--text-secondary);
  margin-bottom: var(--space-3);
  line-height: 1.6;
}

.article-card__link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--accent);
  transition: color var(--transition-fast);
}

.article-card__link:hover {
  color: var(--accent-hover);
}

.article-card__link svg {
  transition: transform var(--transition-fast);
}

.article-card__link:hover svg {
  transform: translateX(4px);
}

/* ===== Page Header (Projects, Publications) ===== */
.page-header {
  text-align: center;
  padding-bottom: var(--space-8);
}

.page-header__title {
  font-size: var(--text-5xl);
  font-weight: 700;
  letter-spacing: -0.025em;
  margin-bottom: var(--space-4);
}

.page-header__subtitle {
  font-size: var(--text-lg);
  color: var(--text-secondary);
}

@media (max-width: 768px) {
  .page-header__title {
    font-size: var(--text-4xl);
  }
}

/* ===== About Page ===== */
.about-page {
  display: grid;
  grid-template-columns: 250px 1fr;
  gap: var(--space-12);
  align-items: start;
}

@media (max-width: 768px) {
  .about-page {
    grid-template-columns: 1fr;
    gap: var(--space-8);
    text-align: center;
  }
}

.about-page__image {
  position: sticky;
  top: calc(var(--header-height) + var(--space-8));
}

.about-page__photo {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: var(--radius-xl);
  box-shadow: 0 10px 30px var(--card-shadow);
}

@media (max-width: 768px) {
  .about-page__image {
    position: static;
    display: flex;
    justify-content: center;
  }

  .about-page__photo {
    width: 200px;
  }
}

.about-page__title {
  font-size: var(--text-4xl);
  font-weight: 700;
  margin-bottom: var(--space-6);
}

.about-page__bio {
  font-size: var(--text-lg);
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: var(--space-8);
}

.about-page__section-title {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-4);
  color: var(--text-primary);
}

.about-page__education {
  margin-bottom: var(--space-8);
}

.about-page__education li {
  margin-bottom: var(--space-3);
}

.about-page__degree {
  display: block;
  font-weight: 500;
  color: var(--text-primary);
}

.about-page__school {
  font-size: var(--text-sm);
  color: var(--text-muted);
}

.about-page__interests {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-8);
}

@media (max-width: 768px) {
  .about-page__interests {
    justify-content: center;
  }
}

.about-page__interests li {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  background: var(--bg-secondary);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
}

.about-page__actions {
  margin-bottom: var(--space-8);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 500;
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.btn--primary {
  color: var(--accent);
  border: 1px solid var(--accent);
}

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

.about-page__contact {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

@media (max-width: 768px) {
  .about-page__contact {
    align-items: center;
  }
}

.about-page__contact li a {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-base);
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.about-page__contact li a:hover {
  color: var(--accent);
}

/* ===== Footer Links ===== */
.footer__links {
  display: flex;
  justify-content: center;
  gap: var(--space-6);
  margin-bottom: var(--space-4);
}

.footer__links a {
  font-size: var(--text-sm);
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

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

/* ===== Page Load Animation ===== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fadeInUp 0.6s ease forwards;
}

main {
  animation: fadeInUp 0.5s ease forwards;
}

/* ===== Enhanced Active Link Styling ===== */
.nav__links a.is-active {
  color: var(--text-primary);
  position: relative;
}

.nav__links a.is-active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent);
  border-radius: 1px;
}

/* ===== Enhanced Gallery Hover ===== */
.photo-gallery__item {
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.photo-gallery__item:hover {
  transform: rotate(0deg) scale(1.05);
  box-shadow: 0 20px 40px var(--card-shadow-hover);
}

/* ===== Article Card Separators ===== */
.article-card {
  position: relative;
}

.article-card:not(:last-child)::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: var(--space-6);
  right: var(--space-6);
  height: 1px;
  background: var(--border);
}

/* ===== Back to Top Button ===== */
.back-to-top {
  position: fixed;
  bottom: var(--space-8);
  right: var(--space-8);
  width: 44px;
  height: 44px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity var(--transition-base),
              visibility var(--transition-base),
              transform var(--transition-base),
              background-color var(--transition-fast),
              color var(--transition-fast);
  z-index: 50;
  box-shadow: 0 4px 12px var(--card-shadow);
}

.back-to-top:hover {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

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

.back-to-top svg {
  width: 20px;
  height: 20px;
}

@media (max-width: 640px) {
  .back-to-top {
    bottom: var(--space-4);
    right: var(--space-4);
    width: 40px;
    height: 40px;
  }
}

/* ===== Theme Toggle Button ===== */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  justify-self: end;
  width: 40px;
  height: 40px;
  background: transparent;
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  color: var(--text-secondary);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.theme-toggle:hover {
  color: var(--text-primary);
  background: var(--bg-secondary);
}

.theme-toggle__icon {
  width: 20px;
  height: 20px;
}

/* Show sun in dark mode, moon in light mode */
.theme-toggle__icon--sun {
  display: none;
}

.theme-toggle__icon--moon {
  display: block;
}

[data-theme="dark"] .theme-toggle__icon--sun {
  display: block;
}

[data-theme="dark"] .theme-toggle__icon--moon {
  display: none;
}

/* Dark theme colors when manually toggled */
[data-theme="dark"] {
  --bg-primary: #09090b;
  --bg-secondary: #18181b;
  --text-primary: #f4f4f5;
  --text-secondary: #a1a1aa;
  --text-muted: #71717a;
  --border: #27272a;
  --card-bg: #18181b;
  --card-shadow: rgba(0, 0, 0, 0.2);
  --card-shadow-hover: rgba(0, 0, 0, 0.4);
}

/* Light theme colors when manually toggled */
[data-theme="light"] {
  --bg-primary: #fafafa;
  --bg-secondary: #f4f4f5;
  --text-primary: #27272a;
  --text-secondary: #52525b;
  --text-muted: #a1a1aa;
  --border: #e4e4e7;
  --card-bg: #ffffff;
  --card-shadow: rgba(0, 0, 0, 0.05);
  --card-shadow-hover: rgba(0, 0, 0, 0.1);
}

[data-theme="light"] .theme-toggle__icon--sun {
  display: none;
}

[data-theme="light"] .theme-toggle__icon--moon {
  display: block;
}

@media (max-width: 640px) {
  .theme-toggle {
    width: 36px;
    height: 36px;
  }
}

/* ===== Article Card Clickable ===== */
.article-card--link {
  display: block;
  text-decoration: none;
  color: inherit;
}

.article-card--link .article-card__title {
  color: var(--text-primary);
  transition: color var(--transition-fast);
}

.article-card--link:hover .article-card__title {
  color: var(--accent);
}

/* ===== Articles List Page ===== */
.articles-list {
  padding-top: 0;
}

.articles-list__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  max-width: 900px;
  margin: 0 auto;
}

/* Article Preview Card */
.article-preview {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: var(--space-6);
  padding: var(--space-6);
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  text-decoration: none;
  color: inherit;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.article-preview:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 40px var(--card-shadow-hover);
}

@media (max-width: 768px) {
  .article-preview {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }
}

.article-preview__image {
  aspect-ratio: 16 / 10;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--bg-secondary);
}

.article-preview__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-base);
}

.article-preview:hover .article-preview__image img {
  transform: scale(1.05);
}

.article-preview__content {
  display: flex;
  flex-direction: column;
}

.article-preview__meta {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

.article-preview__tag {
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent);
  background: var(--bg-secondary);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
}

.article-preview__date {
  font-size: var(--text-sm);
  color: var(--text-muted);
}

.article-preview__title {
  font-size: var(--text-xl);
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: var(--space-2);
  color: var(--text-primary);
  transition: color var(--transition-fast);
}

.article-preview:hover .article-preview__title {
  color: var(--accent);
}

.article-preview__description {
  font-size: var(--text-base);
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-4);
  flex-grow: 1;
}

.article-preview__link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--accent);
}

.article-preview__link svg {
  transition: transform var(--transition-fast);
}

.article-preview:hover .article-preview__link svg {
  transform: translateX(4px);
}

/* ===== Individual Article Page ===== */
.article-page {
  padding: var(--space-8) 0 var(--space-24);
}

.article-page .container {
  max-width: 800px;
}

.article-page__back {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: var(--space-8);
  transition: color var(--transition-fast);
}

.article-page__back:hover {
  color: var(--accent);
}

.article-page__back svg {
  transition: transform var(--transition-fast);
}

.article-page__back:hover svg {
  transform: translateX(-4px);
}

.article-page__header {
  margin-bottom: var(--space-8);
}

.article-page__meta {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.article-page__tag {
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent);
  background: var(--bg-secondary);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
}

.article-page__date {
  font-size: var(--text-sm);
  color: var(--text-muted);
}

.article-page__title {
  font-size: var(--text-4xl);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.025em;
  margin-bottom: var(--space-3);
}

.article-page__subtitle {
  font-size: var(--text-xl);
  color: var(--text-secondary);
  line-height: 1.5;
}

.article-page__image {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--radius-xl);
  margin-bottom: var(--space-10);
}

.article-page__content {
  font-size: var(--text-base);
  line-height: 1.75;
  color: var(--text-primary);
}

.article-page__content h2 {
  font-size: var(--text-2xl);
  font-weight: 600;
  margin-top: var(--space-10);
  margin-bottom: var(--space-4);
  color: var(--text-primary);
}

.article-page__content h2:first-child {
  margin-top: 0;
}

.article-page__content p {
  margin-bottom: var(--space-4);
  color: var(--text-secondary);
}

.article-page__content ul {
  margin-bottom: var(--space-4);
  padding-left: var(--space-6);
  list-style: disc;
}

.article-page__content ul li {
  margin-bottom: var(--space-2);
  color: var(--text-secondary);
}

.article-page__content a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}

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

.article-page__content em {
  font-style: italic;
}

.article-page__content code {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.875em;
  background: var(--bg-secondary);
  padding: 0.15em 0.4em;
  border-radius: var(--radius-sm);
  color: var(--text-primary);
}

.article-page__content pre {
  margin: var(--space-4) 0;
  padding: var(--space-4);
  background: #1e1e1e;
  border-radius: var(--radius-lg);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.article-page__content pre code {
  display: block;
  background: transparent;
  padding: 0;
  font-size: var(--text-sm);
  line-height: 1.6;
  color: #d4d4d4;
  white-space: pre;
}

@media (prefers-color-scheme: dark) {
  .article-page__content pre {
    background: #0d0d0d;
    border: 1px solid var(--border);
  }
}

[data-theme="dark"] .article-page__content pre {
  background: #0d0d0d;
  border: 1px solid var(--border);
}

@media (max-width: 768px) {
  .article-page__title {
    font-size: var(--text-3xl);
  }

  .article-page__subtitle {
    font-size: var(--text-lg);
  }
}