/* ========== Fadey Blog - Premium Black & White ========== */
:root {
  --black: #000;
  --white: #fff;
  --gray-50: #fafafa;
  --gray-100: #f5f5f5;
  --gray-200: #e5e5e5;
  --gray-300: #d4d4d4;
  --gray-400: #a3a3a3;
  --gray-500: #737373;
  --gray-600: #525252;
  --gray-700: #404040;
  --gray-800: #262626;
  --gray-900: #171717;
  --max-width: 1280px;
  --header-height: 64px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Text', 'Helvetica Neue', 'PingFang SC', sans-serif;
  line-height: 1.7;
  color: var(--black);
  background: var(--white);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

/* ========== Header ========== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.85);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid rgba(0,0,0,0.08);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 48px;
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-logo {
  font-size: 1.125rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--black);
}

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

.main-nav a {
  font-size: 0.875rem;
  font-weight: 400;
  color: var(--gray-600);
  transition: color 0.2s;
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--black);
}

/* ========== Hero ========== */
.hero {
  padding: 160px 48px 80px;
  max-width: var(--max-width);
  margin: 0 auto;
}

.hero h1 {
  font-size: 4rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 16px;
}

.hero p {
  font-size: 1.25rem;
  color: var(--gray-500);
  font-weight: 400;
}

/* ========== Main Layout ========== */
.main-layout {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 48px 80px;
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 80px;
}

/* ========== Article Cards ========== */
.articles-section {
  padding-top: 40px;
  border-top: 1px solid var(--gray-200);
}

.section-title {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--gray-400);
  margin-bottom: 40px;
}

.article-card {
  display: block;
  margin-bottom: 48px;
  cursor: pointer;
}

.article-card:hover .article-cover {
  transform: scale(1.02);
}

.article-cover {
  width: 100%;
  height: 320px;
  object-fit: cover;
  border-radius: 12px;
  margin-bottom: 20px;
  transition: transform 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.article-body {
  padding: 0;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 12px;
  font-size: 0.8125rem;
  color: var(--gray-400);
}

.article-category {
  font-weight: 600;
  color: var(--black);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.article-title {
  font-size: 1.75rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.3;
  margin-bottom: 12px;
  color: var(--black);
}

.article-card:hover .article-title {
  color: var(--gray-600);
}

.article-excerpt {
  font-size: 1rem;
  color: var(--gray-500);
  line-height: 1.7;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-tags {
  display: flex;
  gap: 8px;
  margin-top: 16px;
}

.tag {
  font-size: 0.75rem;
  color: var(--gray-400);
  padding: 4px 12px;
  border: 1px solid var(--gray-200);
  border-radius: 100px;
  transition: all 0.2s;
}

.tag:hover {
  border-color: var(--black);
  color: var(--black);
}

/* ========== Sidebar ========== */
.sidebar {
  position: sticky;
  top: calc(var(--header-height) + 48px);
  align-self: start;
}

.sidebar-widget {
  margin-bottom: 48px;
}

.sidebar-widget h3 {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--gray-400);
  margin-bottom: 20px;
}

/* Search */
.search-box {
  position: relative;
}

.search-box input {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--gray-200);
  border-radius: 8px;
  font-size: 0.875rem;
  outline: none;
  transition: all 0.2s;
  background: var(--gray-50);
  font-family: inherit;
}

.search-box input:focus {
  border-color: var(--black);
  background: var(--white);
}

.search-box input::placeholder {
  color: var(--gray-400);
}

/* Categories */
.category-list {
  list-style: none;
}

.category-list li {
  padding: 12px 0;
  border-bottom: 1px solid var(--gray-100);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.category-list li:last-child {
  border-bottom: none;
}

.category-list a {
  font-size: 0.875rem;
  color: var(--gray-600);
  transition: color 0.2s;
}

.category-list a:hover {
  color: var(--black);
}

.category-count {
  font-size: 0.75rem;
  color: var(--gray-400);
}

/* Tags */
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* ========== Article Page ========== */
.article-page {
  max-width: 720px;
  margin: 0 auto;
  padding: 140px 24px 80px;
}

.article-header {
  margin-bottom: 48px;
}

.article-cover {
  width: 100%;
  height: auto;
  max-height: 480px;
  object-fit: cover;
  border-radius: 12px;
  margin-bottom: 32px;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 16px;
  font-size: 0.8125rem;
  color: var(--gray-400);
}

.article-title {
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: 16px;
}

.article-content {
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--gray-700);
}

.article-content h2 {
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin: 48px 0 20px;
  color: var(--black);
}

.article-content h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 32px 0 16px;
  color: var(--black);
}

.article-content p {
  margin-bottom: 24px;
}

.article-content a {
  color: var(--black);
  font-weight: 500;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.article-content a:hover {
  color: var(--gray-500);
}

.article-content img {
  border-radius: 8px;
  margin: 32px 0;
  width: 100%;
}

.article-content video {
  width: 100%;
  border-radius: 8px;
  margin: 32px 0;
  background: var(--gray-900);
}

.article-content iframe {
  width: 100%;
  aspect-ratio: 16/9;
  border: none;
  border-radius: 8px;
  margin: 32px 0;
}

.article-content blockquote {
  border-left: 2px solid var(--black);
  padding: 16px 24px;
  margin: 32px 0;
  background: var(--gray-50);
  border-radius: 0 8px 8px 0;
}

.article-content blockquote p {
  margin-bottom: 0;
  color: var(--gray-600);
  font-style: italic;
}

.article-content code {
  background: var(--gray-100);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.875em;
  font-family: 'SF Mono', 'Fira Code', monospace;
}

.article-content pre {
  background: var(--gray-900);
  color: var(--gray-300);
  padding: 24px;
  border-radius: 8px;
  overflow-x: auto;
  margin: 32px 0;
  line-height: 1.5;
}

.article-content pre code {
  background: none;
  padding: 0;
  color: inherit;
  font-size: 0.8125rem;
}

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

.article-content li {
  margin-bottom: 8px;
  color: var(--gray-600);
}

.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 32px 0;
}

.article-content th, .article-content td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--gray-200);
}

.article-content th {
  font-weight: 600;
  color: var(--black);
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Video embed container */
.video-embed {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  overflow: hidden;
  border-radius: 8px;
  margin: 32px 0;
  background: var(--gray-100);
}

.video-embed iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  margin: 0;
}

/* Article Nav */
.article-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-top: 64px;
  padding-top: 32px;
  border-top: 1px solid var(--gray-200);
}

.article-nav a {
  padding: 20px;
  border: 1px solid var(--gray-200);
  border-radius: 8px;
  transition: all 0.2s;
}

.article-nav a:hover {
  border-color: var(--black);
}

.nav-label {
  font-size: 0.75rem;
  color: var(--gray-400);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 8px;
}

.nav-title {
  font-weight: 600;
  font-size: 0.9375rem;
  color: var(--black);
}

/* ========== Create Page ========== */
.create-page {
  max-width: 680px;
  margin: 0 auto;
  padding: 140px 24px 80px;
}

.create-page h1 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 48px;
}

.form-group {
  margin-bottom: 32px;
}

.form-group label {
  display: block;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--black);
  margin-bottom: 8px;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 14px 16px;
  border: 1px solid var(--gray-200);
  border-radius: 8px;
  font-size: 0.9375rem;
  font-family: inherit;
  outline: none;
  transition: all 0.2s;
  background: var(--gray-50);
  color: var(--black);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--black);
  background: var(--white);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--gray-400);
}

.form-group textarea {
  min-height: 400px;
  resize: vertical;
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 0.875rem;
  line-height: 1.6;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.form-hint {
  font-size: 0.75rem;
  color: var(--gray-400);
  margin-top: 8px;
}

/* File upload */
.file-upload {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 32px;
  border: 2px dashed var(--gray-200);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s;
  background: var(--gray-50);
}

.file-upload:hover {
  border-color: var(--gray-400);
}

.file-upload input[type="file"] {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
}

.file-upload-text {
  font-size: 0.875rem;
  color: var(--gray-500);
  text-align: center;
}

.file-upload-text span {
  color: var(--black);
  font-weight: 500;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.file-preview {
  margin-top: 16px;
  position: relative;
}

.file-preview img {
  max-height: 200px;
  border-radius: 8px;
  object-fit: cover;
}

.file-preview .remove-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 28px;
  height: 28px;
  background: var(--black);
  color: var(--white);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  font-size: 0.875rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border: none;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.2s;
}

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

.btn-primary:hover {
  background: var(--gray-800);
}

.btn-secondary {
  background: var(--white);
  color: var(--black);
  border: 1px solid var(--gray-200);
}

.btn-secondary:hover {
  border-color: var(--black);
}

.btn-group {
  display: flex;
  gap: 12px;
  margin-top: 32px;
}

/* Output */
.output-section {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--gray-200);
}

.output-section h2 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 16px;
}

.code-output {
  background: var(--gray-900);
  color: var(--gray-300);
  padding: 24px;
  border-radius: 8px;
  overflow-x: auto;
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 0.8125rem;
  line-height: 1.6;
  max-height: 400px;
  overflow-y: auto;
}

/* Toast */
.toast {
  background: var(--black);
  color: var(--white);
  padding: 14px 24px;
  border-radius: 8px;
  position: fixed;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 9999;
  font-size: 0.875rem;
  font-weight: 500;
  animation: slideUp 0.3s ease;
}

@keyframes slideUp {
  from { opacity: 0; transform: translateX(-50%) translateY(16px); }
  to { opacity: 1; transform: translateX(-50%) translateY(0); }
}

/* ========== Login Modal ========== */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0,0,0,0.5);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
}

.modal {
  background: var(--white);
  padding: 48px;
  border-radius: 16px;
  width: 100%;
  max-width: 400px;
  box-shadow: 0 24px 48px rgba(0,0,0,0.15);
}

.modal h2 {
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}

.modal p {
  font-size: 0.875rem;
  color: var(--gray-500);
  margin-bottom: 24px;
}

.modal input {
  width: 100%;
  padding: 14px 16px;
  border: 1px solid var(--gray-200);
  border-radius: 8px;
  font-size: 0.9375rem;
  font-family: inherit;
  outline: none;
  margin-bottom: 16px;
  transition: all 0.2s;
}

.modal input:focus {
  border-color: var(--black);
}

.modal .btn-group {
  margin-top: 0;
}

.modal .btn {
  width: 100%;
}

.modal .error {
  color: var(--gray-500);
  font-size: 0.8125rem;
  margin-bottom: 16px;
  display: none;
}

/* ========== Footer ========== */
.site-footer {
  text-align: center;
  padding: 48px 24px;
  border-top: 1px solid var(--gray-100);
}

.site-footer p {
  font-size: 0.8125rem;
  color: var(--gray-400);
}

/* ========== No Results ========== */
.no-results {
  text-align: center;
  padding: 80px 24px;
}

.no-results p {
  font-size: 1rem;
  color: var(--gray-400);
}

/* ========== Responsive ========== */
@media (max-width: 960px) {
  .header-inner {
    padding: 0 24px;
  }
  
  .hero {
    padding: 120px 24px 60px;
  }
  
  .hero h1 {
    font-size: 2.5rem;
  }
  
  .main-layout {
    grid-template-columns: 1fr;
    gap: 48px;
    padding: 0 24px 60px;
  }
  
  .sidebar {
    position: static;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
    padding-top: 32px;
    border-top: 1px solid var(--gray-200);
  }
  
  .sidebar-widget {
    margin-bottom: 0;
  }
}

@media (max-width: 640px) {
  .hero h1 {
    font-size: 2rem;
  }
  
  .main-nav {
    gap: 16px;
  }
  
  .main-nav a {
    font-size: 0.8125rem;
  }
  
  .sidebar {
    grid-template-columns: 1fr;
  }
  
  .article-title {
    font-size: 1.5rem;
  }
  
  .article-cover {
    height: 200px;
  }
  
  .form-row {
    grid-template-columns: 1fr;
  }
  
  .article-nav {
    grid-template-columns: 1fr;
  }
  
  .btn-group {
    flex-wrap: wrap;
  }
  
  .create-page {
    padding: 120px 16px 60px;
  }
}