/* ============================================
   MyBlog - Editorial/Magazine Design System
   ============================================ */

/* CSS Variables */
:root {
  --color-bg-primary: rgb(28, 28, 28);
  --color-bg-secondary: #1a1a1a;
  --color-bg-tertiary: #242424;
  --color-bg-card: rgb(28, 28, 28);
  --color-bg-card-hover: #1e1e1e;

  --color-text-primary: #f5f5f5;
  --color-text-secondary: #a0a0a0;
  --color-text-muted: #666666;

  --color-accent: #d4a574;
  --color-accent-hover: #e5b785;
  --color-accent-subtle: rgba(212, 165, 116, 0.1);
  --color-accent-glow: rgba(212, 165, 116, 0.3);

  --color-border: #2a2a2a;
  --color-border-subtle: #222222;

  --font-display: 'Noto Serif SC', 'Source Han Serif SC', serif;
  --font-body: 'Noto Sans SC', 'Source Han Sans SC', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  --transition-fast: 0.15s ease;
  --transition-medium: 0.3s ease;
  --transition-slow: 0.5s ease;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);

  --content-max-width: 900px;
  --nav-max-width: 1200px;
}

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

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

body {
  font-family: var(--font-body);
  background-color: var(--color-bg-primary);
  color: var(--color-text-primary);
  line-height: 1.7;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Background Texture */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image:
    radial-gradient(ellipse at 20% 20%, rgba(212, 165, 116, 0.03) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 80%, rgba(212, 165, 116, 0.02) 0%, transparent 50%);
  pointer-events: none;
  z-index: -1;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-body);
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  background: linear-gradient(135deg, var(--color-text-primary) 0%, var(--color-accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

h2 {
  font-size: clamp(1.5rem, 4vw, 2rem);
  color: var(--color-text-primary);
}

h3 {
  font-size: clamp(1.25rem, 3vw, 1.5rem);
}

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

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

/* Header */
.site-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 1.5rem 3rem;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: transparent;
}

.header-left {
  display: flex;
  align-items: baseline;
  gap: 2rem;
}

.header-logo {
  font-family: var(--font-body);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-text-primary);
  letter-spacing: 0.05em;
  transition: color var(--transition-fast);
}

.header-logo:hover {
  color: var(--color-accent);
}

.header-nav {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
}

.nav-link {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 0 1rem;
  transition: color var(--transition-fast);
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width var(--transition-medium), left var(--transition-medium);
}

.nav-link:hover {
  color: var(--color-text-primary);
}

.nav-link:hover::after {
  width: 80%;
  left: 10%;
}

/* Hamburger Menu */
.menu-toggle {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0 1rem;
  transition: all var(--transition-fast);
  position: relative;
}

.menu-toggle::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width var(--transition-medium), left var(--transition-medium);
}

.menu-toggle:hover::after {
  width: 80%;
  left: 10%;
}

.menu-icon {
  display: flex;
  flex-direction: column;
  gap: 3px;
  width: 18px;
}

.menu-line {
  width: 100%;
  height: 2px;
  background: var(--color-text-secondary);
  transition: all var(--transition-fast);
}

.menu-toggle:hover .menu-line {
  background: var(--color-text-primary);
}

.menu-text {
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.menu-toggle:hover .menu-text {
  color: var(--color-text-primary);
}

/* Fullscreen Menu */
.fullscreen-menu {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-bg-primary);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-medium), visibility var(--transition-medium);
}

.fullscreen-menu.active {
  opacity: 1;
  visibility: visible;
}

.menu-content {
  text-align: center;
}

.menu-nav {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.menu-link {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 0.5rem 1rem;
  transition: color var(--transition-fast);
  position: relative;
}

.menu-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width var(--transition-medium), left var(--transition-medium);
}

.menu-link:hover {
  color: var(--color-text-primary);
}

.menu-link:hover::after {
  width: 80%;
  left: 10%;
}

.menu-footer {
  margin-top: 4rem;
}

.menu-copyright {
  color: var(--color-text-muted);
  font-size: 0.8rem;
}

.menu-close {
  position: absolute;
  top: 1.5rem;
  right: 3rem;
  background: transparent;
  border: none;
  cursor: pointer;
  font-size: 2rem;
  color: var(--color-text-primary);
  transition: color var(--transition-fast);
}

.menu-close:hover {
  color: var(--color-accent);
}

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

.container-fluid {
  max-width: var(--nav-max-width);
}

/* Main Content */
main, .content-wrapper {
  padding: 3rem 0;
  padding-top: 100px;
  padding-bottom: 2rem;
}

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

/* Article Cards */
.article-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.article-card {
  display: block;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  padding: 1.5rem 2rem;
  transition: all var(--transition-medium);
  position: relative;
  overflow: hidden;
}

.article-card::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  height: 100%;
  width: 3px;
  background: var(--color-accent);
  transform: scaleY(0);
  transition: transform var(--transition-medium);
}

.article-card:hover {
  background: var(--color-bg-card-hover);
  border-color: var(--color-border);
  transform: translateX(4px);
  box-shadow: var(--shadow-md);
}

.article-card:hover::before {
  transform: scaleY(1);
}

.article-card .card-title {
  font-family: var(--font-body);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: 0.5rem;
  transition: color var(--transition-fast);
}

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

.article-card .card-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

.article-card .card-date {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.article-card .card-date::before {
  content: '';
  width: 4px;
  height: 4px;
  background: var(--color-accent);
  border-radius: 50%;
}

/* Post Page */
.post-header {
  margin-bottom: 3rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--color-border);
}

.post-title {
  font-size: clamp(2rem, 6vw, 3.5rem);
  margin-bottom: 1rem;
  line-height: 1.2;
}

.post-meta {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.post-content {
  font-size: 1.1rem;
  line-height: 1.9;
  color: var(--color-text-primary);
}

.post-content h1, .post-content h2, .post-content h3,
.post-content h4, .post-content h5, .post-content h6 {
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  color: var(--color-text-primary);
}

.post-content p {
  margin-bottom: 1.5rem;
}

.post-content a {
  border-bottom: 1px solid var(--color-accent-subtle);
  transition: border-color var(--transition-fast);
}

.post-content a:hover {
  border-bottom-color: var(--color-accent);
}

.post-content img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  margin: 2rem 0;
  box-shadow: var(--shadow-md);
}

.post-content pre {
  background: var(--color-bg-tertiary) !important;
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem !important;
  overflow-x: auto;
  margin: 1.5rem 0;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  line-height: 1.6;
}

.post-content code {
  font-family: var(--font-mono);
  background: var(--color-bg-tertiary);
  padding: 0.2em 0.4em;
  border-radius: var(--radius-sm);
  font-size: 0.85em;
}

.post-content pre code {
  background: none;
  padding: 0;
}

.post-content blockquote {
  border-left: 3px solid var(--color-accent);
  margin: 1.5rem 0;
  padding: 1rem 1.5rem;
  background: var(--color-bg-secondary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  color: var(--color-text-secondary);
  font-style: italic;
}

.post-content ul, .post-content ol {
  margin-bottom: 1.5rem;
  padding-left: 1.5rem;
}

.post-content li {
  margin-bottom: 0.5rem;
}

.post-content li::marker {
  color: var(--color-accent);
}

/* Back Button */
.back-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  padding: 0.75rem 1.25rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg-secondary);
  transition: all var(--transition-fast);
  margin-top: 3rem;
}

.back-btn:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
  background: var(--color-accent-subtle);
}

.back-btn::before {
  content: '←';
  transition: transform var(--transition-fast);
}

.back-btn:hover::before {
  transform: translateX(-3px);
}

/* Navigation Page */
.nav-page {
  animation: fadeInUp 0.6s ease-out;
  width: 100%;
}

.nav-page h1 {
  text-align: center;
  margin-bottom: 1rem;
}

.page-header {
  text-align: center;
  margin-bottom: 3rem;
}

.nav-category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  justify-content: center;
}

.nav-category-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-medium);
  width: 100%;
}

.nav-category-card:hover {
  border-color: var(--color-border);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.nav-category-header {
  background: linear-gradient(135deg, var(--color-bg-secondary) 0%, var(--color-bg-tertiary) 100%);
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--color-border-subtle);
}

.nav-category-header h3 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin: 0;
}

.nav-link-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.nav-link-item {
  border-bottom: 1px solid var(--color-border-subtle);
}

.nav-link-item:last-child {
  border-bottom: none;
}

.nav-link-item a {
  display: block;
  padding: 1.25rem 1.5rem;
  transition: all var(--transition-fast);
}

.nav-link-item:hover {
  background: var(--color-bg-card-hover);
}

.nav-link-item:hover a {
  color: var(--color-accent);
}

.nav-link-item .link-name {
  font-weight: 500;
  color: var(--color-text-primary);
  margin-bottom: 0.35rem;
}

.nav-link-item .link-desc {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* Footer */
.site-footer {
  text-align: center;
  padding: 2rem 0;
  color: var(--color-text-muted);
  font-size: 0.85rem;
  margin-top: 3rem;
}

/* Responsive */
@media (max-width: 768px) {
  :root {
    --content-max-width: 100%;
  }

  .site-header {
    padding: 1rem 1.5rem;
  }

  .header-logo {
    font-size: 1.1rem;
  }

  .header-nav {
    display: none;
  }

  .menu-toggle {
    padding: 0.5rem;
  }

  .menu-close {
    right: 1.5rem;
  }

  .article-card {
    padding: 1.25rem 1.5rem;
  }

  .post-content {
    font-size: 1rem;
  }

  .nav-page {
    padding: 0 1rem;
  }
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-muted);
}

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

/* Focus States */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* Utilities */
.text-muted {
  color: var(--color-text-muted) !important;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* Login Page */
.login-wrapper {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 60vh;
  animation: fadeInUp 0.6s ease-out;
}

.login-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  padding: 3rem 2.5rem;
  text-align: center;
  max-width: 400px;
  width: 100%;
}

.login-card h1 {
  font-size: 1.75rem;
  margin-bottom: 0.5rem;
}

.login-subtitle {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  margin-bottom: 2rem;
}

.login-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.login-form .input-group {
  position: relative;
}

.login-form input[type="password"] {
  width: 100%;
  padding: 1rem 1.25rem;
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  font-size: 1rem;
  font-family: var(--font-body);
  transition: all var(--transition-fast);
}

.login-form input[type="password"]:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-subtle);
}

.login-form input[type="password"]::placeholder {
  color: var(--color-text-muted);
}

.login-btn {
  padding: 1rem 1.5rem;
  background: var(--color-accent);
  border: none;
  border-radius: var(--radius-md);
  color: var(--color-bg-primary);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.login-btn:hover {
  background: var(--color-accent-hover);
  transform: translateY(-2px);
}

.login-btn:active {
  transform: translateY(0);
}

.login-error {
  color: #e57373;
  font-size: 0.85rem;
  margin-top: 0.5rem;
}