/* 
 * CFBlog - Editorial Dark Theme
 * A refined reading experience for technical content
 */

/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Crimson+Text:ital,wght@0,400;0,600;0,700;1,400&family=Outfit:wght@300;400;500;600;700&display=swap');

/* CSS Variables */
:root {
  --bg-primary: #0a0a0b;
  --bg-secondary: #121214;
  --bg-card: #18181b;
  --bg-card-hover: #1f1f23;
  --bg-elevated: #222225;
  
  --text-primary: #fafafa;
  --text-secondary: #a1a1aa;
  --text-muted: #71717a;
  
  --accent-primary: #f59e0b;
  --accent-secondary: #fbbf24;
  --accent-tertiary: #d97706;
  
  --border-subtle: #27272a;
  --border-default: #3f3f46;
  
  --font-display: 'Outfit', system-ui, sans-serif;
  --font-body: 'Crimson Text', Georgia, serif;
  
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);
  
  --shadow-glow: 0 0 40px rgba(245, 158, 11, 0.15);
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.4);
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  font-size: 18px;
  line-height: 1.7;
  color: var(--text-primary);
  background: var(--bg-primary);
  min-height: 100vh;
}

/* Background texture */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    radial-gradient(ellipse at 20% 0%, rgba(245, 158, 11, 0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 100%, rgba(251, 191, 36, 0.05) 0%, transparent 50%);
  pointer-events: none;
  z-index: 0;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(1.75rem, 3vw, 2.5rem); }
h3 { font-size: clamp(1.25rem, 2vw, 1.75rem); }

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

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

/* Layout */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

.container--narrow {
  max-width: 760px;
}

/* Header */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 10, 11, 0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
  padding: 20px 0;
}

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

.header__logo {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 12px;
}

.header__logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-tertiary));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  color: var(--bg-primary);
  font-weight: 700;
}

.header__nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.header__nav a {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

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

.header__nav a--active {
  color: var(--accent-secondary);
}

/* Buttons */
.btn {
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 12px 24px;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.btn--primary {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-tertiary));
  color: var(--bg-primary);
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

.btn--secondary {
  background: var(--bg-elevated);
  color: var(--text-primary);
  border: 1px solid var(--border-default);
}

.btn--secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent-primary);
}

.btn--ghost {
  background: transparent;
  color: var(--text-secondary);
}

.btn--ghost:hover {
  color: var(--text-primary);
  background: var(--bg-card);
}

/* Hero Section */
.hero {
  padding: 80px 0 60px;
  text-align: center;
}

.hero__title {
  margin-bottom: 20px;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* Post Grid */
.posts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 32px;
  padding: 40px 0;
}

/* Post Card */
.post-card {
  background: var(--bg-card);
  border-radius: 16px;
  border: 1px solid var(--border-subtle);
  overflow: hidden;
  transition: all var(--transition-smooth);
  cursor: pointer;
  text-decoration: none;
  display: block;
}

.post-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-default);
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
}

.post-card__content {
  padding: 28px;
}

.post-card__meta {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 16px;
  font-family: var(--font-display);
  font-size: 0.85rem;
  color: var(--text-muted);
}

.post-card__category {
  background: var(--bg-elevated);
  color: var(--accent-secondary);
  padding: 4px 12px;
  border-radius: 20px;
  font-weight: 500;
}

.post-card__title {
  color: var(--text-primary);
  margin-bottom: 12px;
  transition: color var(--transition-fast);
}

.post-card:hover .post-card__title {
  color: var(--accent-secondary);
}

.post-card__excerpt {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.post-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

.post-card__tag {
  font-family: var(--font-display);
  font-size: 0.8rem;
  color: var(--text-muted);
  background: var(--bg-secondary);
  padding: 4px 10px;
  border-radius: 4px;
}

/* Article Page */
.article {
  padding: 60px 0;
}

.article__header {
  margin-bottom: 48px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--border-subtle);
}

.article__meta {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-bottom: 24px;
  font-family: var(--font-display);
  font-size: 0.9rem;
  color: var(--text-muted);
}

.article__title {
  margin-bottom: 20px;
}

.article__excerpt {
  font-size: 1.25rem;
  color: var(--text-secondary);
  font-style: italic;
}

.article__content {
  font-size: 1.1rem;
  line-height: 1.9;
}

.article__content h2 {
  margin: 48px 0 20px;
  padding-top: 24px;
  border-top: 1px solid var(--border-subtle);
}

.article__content h3 {
  margin: 32px 0 16px;
}

.article__content p {
  margin-bottom: 24px;
}

.article__content code {
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-size: 0.9em;
  background: var(--bg-elevated);
  padding: 2px 8px;
  border-radius: 4px;
}

.article__content pre {
  background: var(--bg-secondary);
  border-radius: 12px;
  padding: 24px;
  overflow-x: auto;
  margin: 24px 0;
  border: 1px solid var(--border-subtle);
}

.article__content pre code {
  background: none;
  padding: 0;
}

.article__content blockquote {
  border-left: 3px solid var(--accent-primary);
  padding-left: 24px;
  margin: 24px 0;
  color: var(--text-secondary);
  font-style: italic;
}

.article__content ul, .article__content ol {
  margin: 24px 0;
  padding-left: 24px;
}

.article__content li {
  margin-bottom: 8px;
}

/* Admin Panel */
.admin {
  padding: 40px 0;
}

.admin__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 40px;
}

.admin__title {
  font-size: 2rem;
}

.admin__actions {
  display: flex;
  gap: 12px;
}

/* Table */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-display);
  font-size: 0.95rem;
}

.data-table th,
.data-table td {
  padding: 16px;
  text-align: left;
  border-bottom: 1px solid var(--border-subtle);
}

.data-table th {
  font-weight: 600;
  color: var(--text-muted);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.data-table td {
  color: var(--text-secondary);
}

.data-table tr:hover td {
  background: var(--bg-card);
}

.data-table__title {
  color: var(--text-primary);
  font-weight: 500;
}

.data-table__status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 500;
}

.data-table__status--published {
  background: rgba(34, 197, 94, 0.15);
  color: #22c55e;
}

.data-table__status--draft {
  background: rgba(245, 158, 11, 0.15);
  color: var(--accent-secondary);
}

.data-table__actions {
  display: flex;
  gap: 8px;
}

/* Forms */
.form {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.form__group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form__label {
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.form__input,
.form__textarea,
.form__select {
  font-family: var(--font-body);
  font-size: 1rem;
  padding: 14px 18px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 10px;
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.form__input:focus,
.form__textarea:focus,
.form__select:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(245, 158, 11, 0.1);
}

.form__textarea {
  min-height: 300px;
  resize: vertical;
  line-height: 1.7;
}

.form__row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

/* Modal */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-smooth);
}

.modal.active {
  opacity: 1;
  visibility: visible;
}

.modal__content {
  background: var(--bg-secondary);
  border-radius: 20px;
  border: 1px solid var(--border-subtle);
  width: 90%;
  max-width: 700px;
  max-height: 90vh;
  overflow-y: auto;
  padding: 32px;
  transform: translateY(20px);
  transition: transform var(--transition-smooth);
}

.modal.active .modal__content {
  transform: translateY(0);
}

.modal__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}

.modal__close {
  width: 36px;
  height: 36px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.modal__close:hover {
  background: var(--bg-elevated);
  color: var(--text-primary);
}

/* Loading */
.loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 80px 0;
  color: var(--text-muted);
}

.loading__spinner {
  width: 48px;
  height: 48px;
  border: 3px solid var(--border-subtle);
  border-top-color: var(--accent-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin-bottom: 16px;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: 80px 20px;
  color: var(--text-muted);
}

.empty-state__icon {
  font-size: 4rem;
  margin-bottom: 20px;
  opacity: 0.5;
}

.empty-state__title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

/* Footer */
.footer {
  border-top: 1px solid var(--border-subtle);
  padding: 40px 0;
  margin-top: 80px;
  text-align: center;
  color: var(--text-muted);
  font-family: var(--font-display);
  font-size: 0.9rem;
}

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

.animate-in {
  animation: fadeInUp 0.6s ease-out forwards;
  opacity: 0;
}

/* Staggered delays */
.post-card:nth-child(1) { animation-delay: 0.1s; }
.post-card:nth-child(2) { animation-delay: 0.2s; }
.post-card:nth-child(3) { animation-delay: 0.3s; }
.post-card:nth-child(4) { animation-delay: 0.4s; }
.post-card:nth-child(5) { animation-delay: 0.5s; }
.post-card:nth-child(6) { animation-delay: 0.6s; }

/* Toast Notification */
.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-default);
  border-radius: 12px;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-display);
  font-size: 0.95rem;
  z-index: 2000;
  transform: translateY(100px);
  opacity: 0;
  transition: all var(--transition-smooth);
}

.toast.show {
  transform: translateY(0);
  opacity: 1;
}

.toast--success {
  border-color: #22c55e;
}

.toast--error {
  border-color: #ef4444;
}

/* Responsive */
@media (max-width: 768px) {
  .header__nav {
    gap: 16px;
  }
  
  .hero {
    padding: 60px 0 40px;
  }
  
  .posts-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  
  .form__row {
    grid-template-columns: 1fr;
  }
  
  .admin__header {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }
  
  .data-table {
    font-size: 0.85rem;
  }
  
  .data-table th,
  .data-table td {
    padding: 12px;
  }
}