:root {
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-text: #1e293b;
  --color-text-secondary: #64748b;
  --color-text-tertiary: #94a3b8;
  --color-bg: #ffffff;
  --color-bg-secondary: #f8fafc;
  --color-bg-tertiary: #f1f5f9;
  --color-border: #e2e8f0;
  --color-border-hover: #cbd5e1;
  --color-success: #16a34a;
  --color-danger: #dc2626;
  --color-shadow: rgba(0,0,0,0.08);
  
  --font-body: 'Inter', system-ui, sans-serif;
  --font-heading: 'Outfit', system-ui, sans-serif;
  
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;
}

:root[data-theme="dark"] {
  --color-primary: #3b82f6;
  --color-primary-hover: #60a5fa;
  --color-text: #f8fafc;
  --color-text-secondary: #cbd5e1;
  --color-text-tertiary: #94a3b8;
  --color-bg: #0f172a;
  --color-bg-secondary: #1e293b;
  --color-bg-tertiary: #334155;
  --color-border: #334155;
  --color-border-hover: #475569;
  --color-shadow: rgba(0,0,0,0.3);
}

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&family=Outfit:wght@500;600;700&display=swap');

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

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--color-text);
  line-height: 1.2;
  margin-bottom: 0.5rem;
}

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

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

/* Accessibility Focus States */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

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

button {
  cursor: pointer;
  font-family: inherit;
  background: transparent;
  border: none;
}

/* Container */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Navigation */
.nav {
  position: sticky;
  top: 0;
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  z-index: 100;
  padding: 1rem 0;
}

.nav__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav__logo {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav__logo-icon {
  color: var(--color-primary);
}

.nav__links {
  display: flex;
  gap: 2rem;
}

.nav__link {
  color: var(--color-text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
}

.nav__link:hover, .nav__link--active {
  color: var(--color-text);
}

.nav__actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.nav__btn {
  background: none;
  border: none;
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.nav__btn:hover {
  color: var(--color-text);
  background-color: var(--color-bg-secondary);
}

.nav__theme-toggle svg {
  width: 20px;
  height: 20px;
}

.nav__theme-toggle .moon-icon { display: none; }
.nav__theme-toggle .sun-icon { display: block; }

:root[data-theme="dark"] .nav__theme-toggle .moon-icon { display: block; }
:root[data-theme="dark"] .nav__theme-toggle .sun-icon { display: none; }

.nav__mobile-toggle {
  display: none;
  background: none;
  border: none;
  flex-direction: column;
  gap: 4px;
}

.nav__mobile-toggle span {
  width: 24px;
  height: 2px;
  background-color: var(--color-text);
  transition: var(--transition-fast);
}

/* Hero Section */
.hero {
  margin: 2rem 0 4rem;
}

.hero__card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  background-color: var(--color-bg-secondary);
  border-radius: var(--radius-lg);
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.hero__card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 25px var(--color-shadow);
}

.hero__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  min-height: 300px;
  background-color: var(--color-border);
}

.hero__content {
  padding: 3rem 3rem 3rem 1rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.hero__category {
  color: var(--color-primary);
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 1rem;
}

.hero__title {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.hero__excerpt {
  color: var(--color-text-secondary);
  font-size: 1.125rem;
  margin-bottom: 1.5rem;
}

.hero__meta {
  display: flex;
  gap: 1rem;
  color: var(--color-text-tertiary);
  font-size: 0.875rem;
}

/* Two Column Layout */
.two-column {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 3rem;
  margin-bottom: 4rem;
}

.section-header {
  margin-bottom: 2rem;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

.section-header__title {
  font-size: 1.75rem;
  position: relative;
  display: inline-block;
}

.section-header__title::after {
  content: '';
  position: absolute;
  bottom: -0.5rem;
  left: 0;
  width: 40px;
  height: 3px;
  background-color: var(--color-primary);
}

/* Article Grid & Cards */
.article-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 2rem;
}

.article-card {
  display: flex;
  flex-direction: column;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.article-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 15px -3px var(--color-shadow);
}

.article-card__image-wrapper {
  aspect-ratio: 16/9;
  overflow: hidden;
  background-color: var(--color-bg-secondary);
}

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

.article-card__content {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.article-card__category {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-primary);
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

.article-card__title {
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
}

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

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

.article-card__excerpt {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.article-card__meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  color: var(--color-text-tertiary);
  padding-top: 1rem;
  border-top: 1px solid var(--color-border);
}

/* Sidebar */
.sidebar {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

.sidebar__section {
  background-color: var(--color-bg-secondary);
  padding: 1.5rem;
  border-radius: var(--radius-md);
}

.sidebar__title {
  font-size: 1.125rem;
  margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--color-border);
}

.sidebar__trending-list {
  list-style: none;
  counter-reset: trending;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.sidebar__trending-item {
  position: relative;
  padding-left: 2.5rem;
}

.sidebar__trending-item::before {
  counter-increment: trending;
  content: counter(trending);
  position: absolute;
  left: 0;
  top: 0;
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-border-hover);
  line-height: 1;
}

.sidebar__trending-item a {
  color: var(--color-text);
  font-weight: 500;
  font-size: 0.95rem;
}

.sidebar__trending-item a:hover {
  color: var(--color-primary);
}

.sidebar__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.sidebar__tag, .tag {
  display: inline-block;
  padding: 0.35rem 0.75rem;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  transition: var(--transition-fast);
}

.sidebar__tag:hover, .tag:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.sidebar__newsletter-desc {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  margin-bottom: 1rem;
}

.sidebar__newsletter-form {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.sidebar__newsletter-input, .comment-form__input, .comment-form__textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  transition: border-color var(--transition-fast);
}

.sidebar__newsletter-input:focus, .comment-form__input:focus, .comment-form__textarea:focus {
  outline: none;
  border-color: var(--color-primary);
}

.sidebar__newsletter-btn, .btn, .comment-form__submit, .pagination__btn {
  padding: 0.75rem 1.5rem;
  background-color: var(--color-primary);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  font-weight: 500;
  transition: background-color var(--transition-fast);
}

.sidebar__newsletter-btn:hover, .btn:hover, .comment-form__submit:hover, .pagination__btn:hover {
  background-color: var(--color-primary-hover);
}

/* Pagination */
.pagination {
  margin-top: 3rem;
  text-align: center;
}

.pagination__btn {
  background-color: var(--color-bg-secondary);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.pagination__btn:hover {
  background-color: var(--color-border);
}

/* Article Full Page */
.article-full {
  margin: 2rem 0 4rem;
}

.breadcrumb {
  display: flex;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--color-text-tertiary);
  margin-bottom: 2rem;
}

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

.article-full__header {
  max-width: 800px;
  margin: 0 auto 3rem;
  text-align: center;
}

.article-full__category {
  display: inline-block;
  color: var(--color-primary);
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.article-full__title {
  font-size: 3rem;
  margin-bottom: 1.5rem;
}

.article-full__meta {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 2rem;
  color: var(--color-text-secondary);
  font-size: 0.95rem;
}

.article-full__author {
  font-weight: 600;
  color: var(--color-text);
}

.article-full__author-role {
  font-size: 0.875rem;
}

.article-full__content {
  max-width: 760px;
  margin: 0 auto;
  font-size: 1.125rem;
}

.article-full__content p {
  margin-bottom: 1.5rem;
}

.article-full__content h2 {
  font-size: 2rem;
  margin: 2.5rem 0 1rem;
}

.article-full__content h3 {
  font-size: 1.5rem;
  margin: 2rem 0 1rem;
}

.article-full__content ul, .article-full__content ol {
  margin-bottom: 1.5rem;
  padding-left: 1.5rem;
}

.article-full__content li {
  margin-bottom: 0.5rem;
}

.article-full__content blockquote {
  border-left: 4px solid var(--color-primary);
  padding-left: 1.5rem;
  font-style: italic;
  color: var(--color-text-secondary);
  margin: 2rem 0;
}

.article-full__content pre {
  background-color: var(--color-bg-secondary);
  padding: 1.5rem;
  border-radius: var(--radius-sm);
  overflow-x: auto;
  margin-bottom: 1.5rem;
  border: 1px solid var(--color-border);
}

.article-full__content code {
  font-family: monospace;
  font-size: 0.9em;
}

.article-full__tags {
  max-width: 760px;
  margin: 3rem auto;
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.article-full__share {
  max-width: 760px;
  margin: 0 auto 4rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 1.5rem 0;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.share-label {
  font-weight: 600;
}

.share-buttons {
  display: flex;
  gap: 1rem;
}

.share-btn {
  padding: 0.5rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  font-size: 0.875rem;
  font-weight: 500;
  transition: var(--transition-fast);
}

.share-btn:hover {
  background-color: var(--color-bg-secondary);
}

/* Comments Section */
.comment-section {
  max-width: 760px;
  margin: 0 auto 4rem;
}

.comment-section__title {
  margin-bottom: 2rem;
  font-size: 1.5rem;
}

.comment-form {
  background-color: var(--color-bg-secondary);
  padding: 2rem;
  border-radius: var(--radius-md);
  margin-bottom: 3rem;
}

.comment-form__group {
  margin-bottom: 1.5rem;
}

.comment-form__label {
  display: block;
  font-weight: 500;
  margin-bottom: 0.5rem;
}

.comment-list {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.comment-item {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.comment-item--reply {
  margin-left: 3rem;
  padding-left: 1.5rem;
  border-left: 2px solid var(--color-border);
}

.comment-item__header {
  display: flex;
  align-items: baseline;
  gap: 1rem;
}

.comment-item__author {
  font-weight: 600;
  color: var(--color-text);
}

.comment-item__date {
  font-size: 0.8rem;
  color: var(--color-text-tertiary);
}

.comment-item__body {
  color: var(--color-text-secondary);
}

.comment-item__reply-btn {
  align-self: flex-start;
  background: none;
  border: none;
  color: var(--color-primary);
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0;
}

.comment-item__reply-btn:hover {
  text-decoration: underline;
}

.comment-reply-form {
  margin-top: 1rem;
}

/* Search Overlay */
.search-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(4px);
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
  display: flex;
  justify-content: center;
  padding-top: 10vh;
}

.search-overlay--active {
  opacity: 1;
  pointer-events: auto;
}

.search-overlay__container {
  width: 100%;
  max-width: 600px;
  background-color: var(--color-bg);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.5);
  transform: translateY(-20px);
  transition: transform var(--transition-base);
}

.search-overlay--active .search-overlay__container {
  transform: translateY(0);
}

.search-overlay__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--color-border);
}

.search-overlay__input-wrapper {
  flex-grow: 1;
  display: flex;
  align-items: center;
  gap: 1rem;
  color: var(--color-text-secondary);
}

.search-overlay__input {
  flex-grow: 1;
  border: none;
  font-size: 1.25rem;
  outline: none;
  font-family: var(--font-body);
}

.search-overlay__shortcut {
  font-size: 0.75rem;
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-sm);
}

.search-overlay__close {
  background: none;
  border: none;
  font-size: 1.25rem;
  color: var(--color-text-secondary);
  padding: 0.5rem;
}

.search-overlay__results {
  max-height: 60vh;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.search-overlay__result-item {
  padding: 1rem;
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast);
}

.search-overlay__result-item:hover {
  background-color: var(--color-bg-secondary);
}

.search-overlay__result-title {
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.search-overlay__result-excerpt {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

mark {
  background-color: rgba(37, 99, 235, 0.2);
  color: var(--color-text);
}

/* Category Page */
.category-header {
  text-align: center;
  margin: 3rem 0 2rem;
}

.category-header__title {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
}

.category-header__description {
  color: var(--color-text-secondary);
  font-size: 1.125rem;
  margin-bottom: 1rem;
}

.category-header__count {
  font-size: 0.875rem;
  color: var(--color-text-tertiary);
}

.category-filter {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 3rem;
  flex-wrap: wrap;
}

.category-filter__btn {
  padding: 0.5rem 1.25rem;
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  font-weight: 500;
  color: var(--color-text-secondary);
}

.category-filter__btn:hover, .category-filter__btn--active {
  background-color: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

/* Footer */
.footer {
  background-color: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  padding: 4rem 0 2rem;
  margin-top: 4rem;
}

.footer__inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer__title {
  font-size: 1.125rem;
  margin-bottom: 1.25rem;
}

.footer__about {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  max-width: 400px;
}

.footer__links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer__link {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
}

.footer__link:hover {
  color: var(--color-primary);
}

.footer__bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid var(--color-border);
  color: var(--color-text-tertiary);
  font-size: 0.875rem;
}

/* Responsive */
@media (min-width: 1440px) {
  .container {
    max-width: 1400px;
  }
  html {
    font-size: 18px; /* Slightly larger base font for big screens/TVs */
  }
}

@media (max-width: 1024px) {
  .hero__card {
    grid-template-columns: 1fr;
  }
  .hero__image {
    min-height: 200px;
  }
}

@media (max-width: 768px) {
  .two-column {
    grid-template-columns: 1fr;
  }
  
  .nav__links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background-color: var(--color-bg);
    flex-direction: column;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--color-border);
    gap: 1rem;
  }
  
  .nav__links.is-open {
    display: flex;
  }
  
  .nav__mobile-toggle {
    display: flex;
  }
  
  .footer__inner {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .article-full__title {
    font-size: 2rem;
  }
  
  .article-full__meta {
    flex-direction: column;
    gap: 0.5rem;
  }
}

@media (max-width: 480px) {
  .article-grid {
    grid-template-columns: 1fr;
  }
  
  .hero__content {
    padding: 1.5rem 1rem;
  }
  
  .hero__title {
    font-size: 1.5rem;
  }
  
  .category-header__title {
    font-size: 2rem;
  }
}