/* Apple-inspired Design System . */

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 500;
  line-height: 1.2;
  margin-bottom: 1rem;
  color: var(--color-text);
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }

p {
  margin-bottom: 1.5rem;
  color: var(--color-text);
}

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

a:hover {
  opacity: 0.8;
}

/* Container */
.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Header */
.site-header {
  background-color: rgba(255, 255, 255, 0.8);
  backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 1000;
  transition: transform 0.3s ease-in-out, box-shadow 0.3s ease;
  transform: translateY(0);
}

.site-header.header-hidden {
  transform: translateY(-100%);
}

.navbar {
  padding: 0.75rem 0;
}

.navbar-brand {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text);
}

.navbar-brand:hover {
  color: var(--color-text);
  opacity: 0.8;
}

.nav-link {
  color: var(--color-text);
  font-size: 0.875rem;
  padding: 0.5rem 1rem !important;
  transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-accent);
}

.navbar-toggler {
  padding: 0.5rem;
  font-size: 1.25rem;
}

.navbar-toggler:focus {
  box-shadow: none;
}

/* Offcanvas Menu */
.offcanvas {
  background-color: var(--color-background);
}

.offcanvas-header {
  border-bottom: 1px solid var(--color-border);
}

.offcanvas-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text);
}

.offcanvas-body .nav-link {
  font-size: 1rem;
  padding: 0.75rem 1rem !important;
  border-radius: 8px;
  margin-bottom: 0.25rem;
}

.offcanvas-body .nav-link:hover,
.offcanvas-body .nav-link.active {
  background-color: var(--color-background-alt);
  color: var(--color-accent);
}

.offcanvas-body .btn-outline-secondary {
  border-color: var(--color-border);
  color: var(--color-text);
  text-align: left;
}

.offcanvas-body .btn-outline-secondary:hover {
  background-color: var(--color-background-alt);
  border-color: var(--color-border);
  color: var(--color-text);
}

.offcanvas-body .btn-outline-secondary.active {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: white;
}

/* Hero Section */
.hero-section {
  position: relative;
  padding: var(--section-padding) 0;
  background: #1d1d1f;
  overflow: hidden;
}

.hero-section .container {
  position: relative;
  z-index: 10;
}

.min-vh-70 {
  min-height: 70vh;
}

.hero-title {
  font-size: clamp(3rem, 6vw, 5rem);
  font-weight: 700;
  margin-bottom: 1.5rem;
  background: linear-gradient(180deg, #f5f5f7 0%, rgba(245, 245, 247, 0.7) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: clamp(1.25rem, 2vw, 1.75rem);
  color: #a1a1a6;
  font-weight: 400;
}

/* Sections */
.articles-section,
.articles-list-section,
.page-content,
.article-content {
  padding: var(--section-padding) 0;
}

.section-header {
  margin-bottom: 4rem;
}

.section-title {
  font-size: clamp(2.5rem, 4vw, 3.5rem);
  font-weight: 700;
  margin-bottom: 1rem;
}

.section-subtitle {
  font-size: 1.25rem;
  color: var(--color-text-light);
}

/* Error Page */
.error-section {
  padding: var(--section-padding) 0;
  min-height: 80vh;
  display: flex;
  align-items: center;
}

.error-content {
  padding: 2rem 0;
}

.error-code {
  font-size: clamp(6rem, 15vw, 12rem);
  font-weight: 800;
  line-height: 1;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--color-accent) 0%, #6366f1 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.error-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--color-text);
}

.error-description {
  font-size: 1.25rem;
  color: var(--color-text-light);
  margin-bottom: 2rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.error-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* Article Cards */
.article-card {
  height: 100%;
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  overflow: hidden;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.article-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.08);
}

.article-card-image {
  width: 100%;
  height: 200px;
  overflow: hidden;
}

.article-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}

.article-card:hover .article-card-image img {
  transform: scale(1.05);
}

.article-card-content {
  padding: 1.5rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.article-card-title {
  font-size: 1.5rem;
  margin-bottom: 0.75rem;
}

.article-card-title a {
  color: var(--color-text);
  text-decoration: none;
}

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

.article-card-excerpt {
  color: var(--color-text-light);
  font-size: 0.95rem;
  margin-bottom: 1rem;
  flex: 1;
}

.article-card-meta {
  font-size: 0.875rem;
  color: var(--color-text-light);
  margin-bottom: 1rem;
}

.article-date,
.article-author {
  margin-right: 1rem;
}

.btn-read-more {
  color: var(--color-accent);
  font-weight: 500;
  font-size: 0.95rem;
  display: inline-flex;
  align-items: center;
  transition: var(--transition);
}

.btn-read-more:hover {
  transform: translateX(4px);
}

/* Tags */
.article-tags {
  margin-bottom: 1rem;
}

.article-tags .badge {
  margin-right: 0.5rem;
  margin-bottom: 0.5rem;
  padding: 0.35rem 0.75rem;
  font-weight: 500;
  font-size: 0.75rem;
  border-radius: 20px;
}

/* Page Header */
.page-header,
.article-header {
  padding: 4rem 0 2rem;
  background-color: var(--color-background-alt);
}

.page-title,
.article-title {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 700;
  margin-bottom: 1rem;
}

.page-description,
.article-description {
  font-size: 1.25rem;
  color: var(--color-text-light);
}

/* Article Content */
.article-featured-image {
  width: 100%;
  border-radius: var(--border-radius);
  margin-bottom: 2rem;
}

.article-meta {
  font-size: 1rem;
  color: var(--color-text-light);
  margin-bottom: 2rem;
}

/* Prose - Article content styling */
.prose {
  font-size: 1.125rem;
  line-height: 1.8;
  color: var(--color-text);
}

.prose h1,
.prose h2,
.prose h3,
.prose h4,
.prose h5,
.prose h6 {
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  font-weight: 600;
}

.prose p {
  margin-bottom: 1.5rem;
}

.prose img {
  max-width: 100%;
  height: auto;
  border-radius: var(--border-radius);
  margin: 2rem 0;
}

.prose a {
  color: var(--color-accent);
  text-decoration: underline;
}

.prose ul,
.prose ol {
  margin-bottom: 1.5rem;
  padding-left: 2rem;
}

.prose li {
  margin-bottom: 0.5rem;
}

.prose blockquote {
  border-left: 4px solid var(--color-accent);
  padding-left: 1.5rem;
  margin: 2rem 0;
  font-style: italic;
  color: var(--color-text-light);
}

.prose code {
  background-color: var(--color-background-alt);
  padding: 0.2rem 0.4rem;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.9em;
}

.prose pre {
  background-color: var(--color-secondary);
  color: var(--color-background);
  padding: 1.5rem;
  border-radius: var(--border-radius);
  overflow-x: auto;
  margin: 2rem 0;
}

.prose pre code {
  background: none;
  padding: 0;
  color: inherit;
}

/* Buttons */
.btn {
  padding: 0.75rem 1.5rem;
  border-radius: 980px;
  font-weight: 500;
  font-size: 1rem;
  transition: var(--transition);
  border: none;
}

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

.btn-primary:hover {
  background-color: var(--color-accent);
  opacity: 0.9;
  transform: scale(1.02);
}

.btn-outline-primary {
  border: 2px solid var(--color-accent);
  color: var(--color-accent);
  background-color: transparent;
}

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

.btn-lg {
  padding: 1rem 2rem;
  font-size: 1.125rem;
}

/* Footer */
.site-footer {
  background-color: var(--color-background-alt);
  padding: 3rem 0;
  margin-top: var(--section-padding);
  border-top: 1px solid var(--color-border);
}

.site-footer p {
  color: var(--color-text-light);
  margin: 0;
}

.footer-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: flex-end;
  gap: 2rem;
}

.footer-links a {
  color: var(--color-text-light);
  font-size: 0.875rem;
}

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

/* Responsive */
@media (max-width: 768px) {
  .hero-section {
    padding: 3rem 0;
  }

  .articles-section,
  .articles-list-section,
  .page-content,
  .article-content {
    padding: 3rem 0;
  }

  .footer-links {
    justify-content: flex-start;
    margin-top: 1rem;
  }

  .site-footer .row > div:last-child {
    margin-top: 1rem;
  }
}

/* Smooth scrolling */
html {
  scroll-behavior: smooth;
}

/* Selection */
::selection {
  background-color: var(--color-accent);
  color: white;
}

/* Dark Mode Support */
[data-bs-theme="dark"] {
  --color-text: #f5f5f7;
  --color-text-light: #a1a1a6;
  --color-background: #1d1d1f;
  --color-background-alt: #2d2d2f;
  --color-border: #424245;
}

[data-bs-theme="dark"] .site-header {
  background-color: rgba(29, 29, 31, 0.8);
  backdrop-filter: saturate(180%) blur(20px);
  transition: transform 0.3s ease-in-out, box-shadow 0.3s ease;
}

[data-bs-theme="dark"] .article-card {
  background: var(--color-background-alt);
  border-color: var(--color-border);
}

[data-bs-theme="dark"] .article-card:hover {
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

[data-bs-theme="dark"] .hero-section {
  background: var(--color-background);
}

[data-bs-theme="dark"] .offcanvas {
  background-color: var(--color-background);
}

[data-bs-theme="dark"] .offcanvas-header {
  border-bottom-color: var(--color-border);
}

[data-bs-theme="dark"] .btn-close {
  filter: invert(1) grayscale(100%) brightness(200%);
}

[data-bs-theme="dark"] .prose code {
  background-color: var(--color-background-alt);
  color: var(--color-text);
}

[data-bs-theme="dark"] .prose pre {
  background-color: #000;
  color: var(--color-text);
}

[data-bs-theme="dark"] .article-tags .badge.bg-light {
  background-color: var(--color-background-alt) !important;
  color: var(--color-text) !important;
}

/* Theme Switcher Styles */
.bd-mode-toggle {
  z-index: 1500;
}

.bd-mode-toggle .dropdown-toggle::after {
  display: none;
}

.bi {
  fill: currentColor;
}

.dropdown-item.active .bi {
  display: inline-block !important;
}

.dropdown-item:not(.active) .bi:last-child {
  display: none;
}