/* Senuamedia Blog - CSS
   Based on Senuamedia corporate design
   Extended for blog functionality
   ========================================== */

/* CSS Custom Properties */
:root {
  /* Colors */
  --color-primary-900: #0d1b2a;
  --color-primary-800: #1b263b;
  --color-primary-700: #415a77;
  --color-primary-600: #778da9;
  --color-accent-500: #00b4d8;
  --color-accent-400: #48cae4;
  --color-accent-300: #90e0ef;
  --color-white: #ffffff;
  --color-gray-100: #f8f9fa;
  --color-gray-200: #e9ecef;
  --color-gray-300: #dee2e6;
  --color-gray-400: #ced4da;
  --color-gray-500: #adb5bd;
  --color-gray-600: #6c757d;
  --color-text: #e0e1dd;
  --color-text-muted: #778da9;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --font-serif: 'Georgia', 'Times New Roman', serif;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;

  /* Layout */
  --container-max: 1200px;
  --content-max: 800px;
  --border-radius: 8px;
  --border-radius-lg: 16px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 300ms ease;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-primary-900);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
}

/* Accessibility */
.skip-link {
  position: absolute;
  top: -100%;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-accent-500);
  color: var(--color-primary-900);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--border-radius);
  z-index: 9999;
  font-weight: 600;
  text-decoration: none;
}

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
  color: var(--color-white);
}

h1 { font-size: clamp(2.5rem, 5vw, 3.5rem); }
h2 { font-size: clamp(2rem, 4vw, 2.75rem); }
h3 { font-size: clamp(1.25rem, 2.5vw, 1.5rem); }
h4 { font-size: 1.125rem; }

p {
  margin-bottom: var(--space-md);
}

a {
  color: var(--color-accent-500);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover,
a:focus {
  color: var(--color-accent-400);
}

a:focus-visible {
  outline: 2px solid var(--color-accent-500);
  outline-offset: 2px;
}

/* Container */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

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

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--color-gray-100);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.header__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-md) var(--space-xl);
}

.header__logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.header__logo-img {
  height: 28px;
  width: auto;
}

.header__blog-title {
  color: var(--color-primary-800);
  font-weight: 600;
  font-size: 1rem;
  margin-left: var(--space-sm);
  padding-left: var(--space-md);
  border-left: 2px solid var(--color-gray-300);
}

/* Navigation */
.nav__list {
  display: flex;
  gap: var(--space-xl);
  list-style: none;
  padding: 0;
  margin: 0;
}

.nav__link {
  color: var(--color-primary-800);
  font-weight: 500;
  font-size: 0.95rem;
  letter-spacing: 0.02em;
  padding: var(--space-sm) 0;
  position: relative;
}

.nav__link:hover,
.nav__link:focus,
.nav__link--active {
  color: var(--color-accent-500);
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent-500);
  transition: width var(--transition-base);
}

.nav__link:hover::after,
.nav__link:focus::after,
.nav__link--active::after {
  width: 100%;
}

.nav__toggle {
  display: none;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
}

.nav__toggle-icon {
  width: 24px;
  height: 24px;
  color: var(--color-primary-800);
}

/* Hero Section */
.hero {
  min-height: 50vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: calc(80px + var(--space-3xl)) var(--space-xl) var(--space-3xl);
  background: linear-gradient(135deg, var(--color-primary-900) 0%, var(--color-primary-800) 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: 'BLOG';
  position: absolute;
  font-size: clamp(10rem, 25vw, 30rem);
  font-weight: 800;
  color: rgba(0, 180, 216, 0.03);
  z-index: 0;
  letter-spacing: -0.05em;
  pointer-events: none;
}

.hero__content {
  position: relative;
  z-index: 1;
  max-width: 800px;
}

.hero__tagline {
  display: inline-block;
  padding: var(--space-sm) var(--space-lg);
  background: rgba(0, 180, 216, 0.1);
  border: 1px solid rgba(0, 180, 216, 0.3);
  border-radius: 50px;
  color: var(--color-accent-500);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: var(--space-xl);
}

.hero__title {
  margin-bottom: var(--space-lg);
}

.hero__title-accent {
  color: var(--color-accent-500);
}

.hero__description {
  font-size: 1.25rem;
  color: var(--color-text);
  margin-bottom: var(--space-2xl);
  max-width: 650px;
  margin-left: auto;
  margin-right: auto;
}

/* Sections */
.section {
  padding: var(--space-4xl) 0;
}

.section--alt {
  background: var(--color-primary-800);
}

.section__header {
  text-align: center;
  margin-bottom: var(--space-3xl);
}

.section__label {
  display: inline-block;
  color: var(--color-accent-500);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: var(--space-sm);
}

.section__title {
  margin-bottom: var(--space-md);
}

/* Blog Post Grid */
.posts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: var(--space-xl);
}

/* Post Card */
.post-card {
  display: flex;
  flex-direction: column;
  background: rgba(13, 27, 42, 0.6);
  border: 1px solid rgba(0, 180, 216, 0.1);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  transition: all var(--transition-base);
  text-decoration: none;
  color: inherit;
}

.post-card:hover {
  transform: translateY(-5px);
  border-color: rgba(0, 180, 216, 0.3);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.post-card__content {
  padding: var(--space-xl);
  flex: 1;
  display: flex;
  flex-direction: column;
}

.post-card__category {
  display: inline-block;
  padding: var(--space-xs) var(--space-sm);
  background: rgba(0, 180, 216, 0.1);
  border-radius: var(--border-radius);
  color: var(--color-accent-500);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-md);
  align-self: flex-start;
}

.post-card__title {
  font-size: 1.25rem;
  margin-bottom: var(--space-sm);
  line-height: 1.3;
}

.post-card__excerpt {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  margin-bottom: var(--space-lg);
  flex: 1;
}

.post-card__meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--space-md);
  border-top: 1px solid rgba(0, 180, 216, 0.1);
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.post-card__date {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.post-card__read-time {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

/* Featured Post */
.featured-post {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
  background: rgba(13, 27, 42, 0.6);
  border: 1px solid rgba(0, 180, 216, 0.2);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  margin-bottom: var(--space-3xl);
}

.featured-post__image {
  background: linear-gradient(135deg, var(--color-accent-500) 0%, #0077b6 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 5rem;
  font-weight: 800;
  color: rgba(255, 255, 255, 0.2);
  min-height: 300px;
}

.featured-post__content {
  padding: var(--space-2xl);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.featured-post__label {
  display: inline-block;
  padding: var(--space-xs) var(--space-sm);
  background: var(--color-accent-500);
  border-radius: var(--border-radius);
  color: var(--color-primary-900);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-md);
  align-self: flex-start;
}

.featured-post__title {
  font-size: 1.75rem;
  margin-bottom: var(--space-md);
}

.featured-post__excerpt {
  color: var(--color-text-muted);
  margin-bottom: var(--space-lg);
}

.featured-post__link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--color-accent-500);
  font-weight: 600;
}

.featured-post__link:hover {
  color: var(--color-accent-400);
}

/* Article Page */
.article {
  padding: calc(80px + var(--space-3xl)) var(--space-xl) var(--space-4xl);
}

.article__header {
  max-width: var(--content-max);
  margin: 0 auto var(--space-3xl);
  text-align: center;
}

.article__category {
  display: inline-block;
  padding: var(--space-xs) var(--space-md);
  background: rgba(0, 180, 216, 0.1);
  border: 1px solid rgba(0, 180, 216, 0.3);
  border-radius: 50px;
  color: var(--color-accent-500);
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-lg);
}

.article__title {
  font-size: clamp(2rem, 4vw, 3rem);
  margin-bottom: var(--space-lg);
  line-height: 1.2;
}

.article__subtitle {
  font-size: 1.25rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-xl);
  font-style: italic;
}

.article__meta {
  display: flex;
  justify-content: center;
  gap: var(--space-xl);
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.article__meta-item {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

/* Article Content */
.article__content {
  max-width: var(--content-max);
  margin: 0 auto;
}

.article__content h2 {
  font-size: 1.75rem;
  margin-top: var(--space-3xl);
  margin-bottom: var(--space-lg);
  padding-top: var(--space-lg);
  border-top: 1px solid rgba(0, 180, 216, 0.1);
}

.article__content h3 {
  font-size: 1.35rem;
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-md);
}

.article__content h4 {
  font-size: 1.1rem;
  margin-top: var(--space-xl);
  margin-bottom: var(--space-md);
  color: var(--color-accent-400);
}

.article__content p {
  font-size: 1.1rem;
  line-height: 1.8;
  margin-bottom: var(--space-lg);
}

.article__content ul,
.article__content ol {
  margin-bottom: var(--space-lg);
  padding-left: var(--space-xl);
}

.article__content li {
  font-size: 1.1rem;
  line-height: 1.7;
  margin-bottom: var(--space-sm);
}

.article__content blockquote {
  margin: var(--space-2xl) 0;
  padding: var(--space-lg) var(--space-xl);
  background: rgba(0, 180, 216, 0.05);
  border-left: 4px solid var(--color-accent-500);
  border-radius: 0 var(--border-radius) var(--border-radius) 0;
  font-style: italic;
  color: var(--color-text);
}

.article__content blockquote p:last-child {
  margin-bottom: 0;
}

.article__content code {
  font-family: var(--font-mono);
  background: rgba(0, 0, 0, 0.3);
  padding: 0.2em 0.4em;
  border-radius: 4px;
  font-size: 0.9em;
}

.article__content pre {
  background: rgba(0, 0, 0, 0.4);
  border: 1px solid rgba(0, 180, 216, 0.1);
  border-radius: var(--border-radius);
  padding: var(--space-lg);
  overflow-x: auto;
  margin: var(--space-xl) 0;
}

.article__content pre code {
  background: transparent;
  padding: 0;
  font-size: 0.9rem;
  line-height: 1.6;
}

.article__content table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-xl) 0;
}

.article__content th,
.article__content td {
  padding: var(--space-md);
  text-align: left;
  border-bottom: 1px solid rgba(0, 180, 216, 0.1);
}

.article__content th {
  background: rgba(0, 180, 216, 0.1);
  font-weight: 600;
  color: var(--color-white);
}

.article__content strong {
  color: var(--color-white);
  font-weight: 600;
}

.article__content hr {
  border: none;
  border-top: 1px solid rgba(0, 180, 216, 0.2);
  margin: var(--space-3xl) 0;
}

/* Article Footer */
.article__footer {
  max-width: var(--content-max);
  margin: var(--space-3xl) auto 0;
  padding-top: var(--space-2xl);
  border-top: 1px solid rgba(0, 180, 216, 0.2);
}

.article__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-xl);
}

.article__tag {
  padding: var(--space-xs) var(--space-md);
  background: rgba(0, 180, 216, 0.1);
  border: 1px solid rgba(0, 180, 216, 0.2);
  border-radius: 50px;
  font-size: 0.85rem;
  color: var(--color-accent-500);
}

.article__author {
  display: flex;
  gap: var(--space-lg);
  align-items: center;
  padding: var(--space-xl);
  background: rgba(13, 27, 42, 0.6);
  border: 1px solid rgba(0, 180, 216, 0.1);
  border-radius: var(--border-radius-lg);
}

.article__author-avatar {
  width: 80px;
  height: 80px;
  background: linear-gradient(135deg, var(--color-accent-500) 0%, #0077b6 100%);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-white);
  flex-shrink: 0;
}

.article__author-info h4 {
  margin-bottom: var(--space-xs);
}

.article__author-info p {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  margin-bottom: 0;
}

/* Categories Filter */
.categories {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  flex-wrap: wrap;
  margin-bottom: var(--space-2xl);
}

.category-btn {
  padding: var(--space-sm) var(--space-lg);
  background: transparent;
  border: 1px solid rgba(0, 180, 216, 0.3);
  border-radius: 50px;
  color: var(--color-text-muted);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-base);
}

.category-btn:hover,
.category-btn--active {
  background: var(--color-accent-500);
  border-color: var(--color-accent-500);
  color: var(--color-primary-900);
}

/* Footer */
.footer {
  background: var(--color-gray-100);
  border-top: 1px solid var(--color-gray-300);
  padding: var(--space-3xl) 0 var(--space-xl);
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: var(--space-3xl);
  margin-bottom: var(--space-2xl);
}

.footer__brand p {
  margin-top: var(--space-md);
  font-size: 0.95rem;
  color: var(--color-gray-600);
  max-width: 300px;
}

.footer__title {
  color: var(--color-primary-800);
  font-size: 0.95rem;
  margin-bottom: var(--space-md);
}

.footer__list {
  list-style: none;
  padding: 0;
}

.footer__list li {
  margin-bottom: var(--space-sm);
}

.footer__link {
  color: var(--color-gray-600);
  font-size: 0.9rem;
}

.footer__link:hover,
.footer__link:focus {
  color: var(--color-accent-500);
}

.footer__bottom {
  text-align: center;
  padding-top: var(--space-xl);
  border-top: 1px solid var(--color-gray-300);
}

.footer__bottom p {
  font-size: 0.85rem;
  color: var(--color-gray-600);
  margin-bottom: 0;
}

/* Back Link */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--color-text-muted);
  font-size: 0.9rem;
  margin-bottom: var(--space-xl);
}

.back-link:hover {
  color: var(--color-accent-500);
}

/* Responsive */
@media (max-width: 1024px) {
  .featured-post {
    grid-template-columns: 1fr;
  }

  .featured-post__image {
    min-height: 200px;
  }

  .footer__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .header__logo-img {
    height: 22px;
  }

  .header__blog-title {
    display: none;
  }

  .nav__list {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--color-gray-100);
    padding: var(--space-xl);
    gap: var(--space-md);
    border-bottom: 1px solid var(--color-gray-300);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  }

  .nav__list--open {
    display: flex;
  }

  .nav__toggle {
    display: block;
  }

  .posts-grid {
    grid-template-columns: 1fr;
  }

  .article__meta {
    flex-direction: column;
    gap: var(--space-sm);
  }

  .article__author {
    flex-direction: column;
    text-align: center;
  }

  .footer__grid {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .footer__brand p {
    max-width: none;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--space-md);
  }

  .section {
    padding: var(--space-3xl) 0;
  }

  .article__content p,
  .article__content li {
    font-size: 1rem;
  }
}