/* Daily Intelligence - Editorial Magazine Style */

@import url('https://fonts.googleapis.com/css2?family=Crimson+Pro:ital,wght@0,300;0,400;0,600;0,700;1,300;1,400&family=Source+Serif+Pro:ital,wght@0,400;0,600;0,700;1,400&family=Space+Grotesk:wght@300;400;500;600;700&display=swap');

/* =========================
   CSS VARIABLES - COLOR SYSTEM
   ========================= */

:root {
  /* Light Theme Colors */
  --color-background: #fafafa;
  --color-surface: #ffffff;
  --color-surface-elevated: #ffffff;
  --color-text-primary: #1a1a1a;
  --color-text-secondary: #4a4a4a;
  --color-text-muted: #737373;
  --color-border: #e5e5e5;
  --color-border-subtle: #f0f0f0;
  
  /* Accent Colors */
  --color-accent: #2563eb;
  --color-accent-hover: #1d4ed8;
  --color-accent-light: #dbeafe;
  
  /* Status Colors */
  --color-success: #059669;
  --color-warning: #d97706;
  --color-error: #dc2626;
  
  /* Shadows */
  --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  
  /* Typography */
  --font-display: 'Crimson Pro', 'Times New Roman', 'Noto Serif SC', serif;
  --font-body: 'Source Serif Pro', 'Times New Roman', 'Noto Serif SC', serif;
  --font-ui: 'Space Grotesk', 'PingFang SC', 'Hiragino Sans GB', sans-serif;
  
  /* Layout */
  --max-width: 1200px;
  --container-padding: 1.5rem;
  --border-radius: 8px;
  --border-radius-lg: 12px;
  
  /* Transitions */
  --transition-fast: 0.15s ease-out;
  --transition-normal: 0.2s ease-out;
  --transition-slow: 0.3s ease-out;
}

/* Dark Theme Override */
html[data-theme="dark"] {
  --color-background: #0f0f13;
  --color-surface: #1a1a1f;
  --color-surface-elevated: #252530;
  --color-text-primary: #f5f5f5;
  --color-text-secondary: #d4d4d8;
  --color-text-muted: #a1a1aa;
  --color-border: #3f3f46;
  --color-border-subtle: #27272a;
  
  --color-accent: #3b82f6;
  --color-accent-hover: #60a5fa;
  --color-accent-light: #1e3a8a;
  
  /* Shadows for dark theme */
  --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.4), 0 1px 2px -1px rgb(0 0 0 / 0.4);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.4), 0 2px 4px -2px rgb(0 0 0 / 0.4);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.4), 0 4px 6px -4px rgb(0 0 0 / 0.4);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.4), 0 8px 10px -6px rgb(0 0 0 / 0.4);
}

/* =========================
   RESET & BASE STYLES
   ========================= */

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

* {
  margin: 0;
  padding: 0;
}

html {
  height: 100%;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100%;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text-primary);
  background-color: var(--color-background);
  transition: color var(--transition-normal), background-color var(--transition-normal);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* =========================
   TYPOGRAPHY
   ========================= */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.25;
  color: var(--color-text-primary);
  letter-spacing: -0.025em;
}

h1 {
  font-size: clamp(2.25rem, 4vw, 3.5rem);
  font-weight: 700;
  margin-bottom: 1.5rem;
}

h2 {
  font-size: clamp(1.875rem, 3vw, 2.5rem);
  margin-bottom: 1.25rem;
}

h3 {
  font-size: clamp(1.5rem, 2.5vw, 2rem);
  margin-bottom: 1rem;
}

h4 {
  font-size: clamp(1.25rem, 2vw, 1.5rem);
  margin-bottom: 0.75rem;
}

h5, h6 {
  font-size: 1.125rem;
  margin-bottom: 0.5rem;
}

p {
  margin-bottom: 1.5rem;
  max-width: 70ch;
}

p:last-child {
  margin-bottom: 0;
}

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

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

/* =========================
   LAYOUT COMPONENTS
   ========================= */

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(12px);
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.site-header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-surface);
  opacity: 0.9;
  z-index: -1;
}

.header-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 0;
}

.site-title {
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-text-primary);
  text-decoration: none;
  letter-spacing: -0.025em;
}

.site-title:hover {
  text-decoration: none;
  color: var(--color-accent);
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border: none;
  border-radius: var(--border-radius);
  background: var(--color-surface-elevated);
  color: var(--color-text-primary);
  cursor: pointer;
  font-size: 1.25rem;
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-sm);
}

.theme-toggle:hover {
  background: var(--color-border);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

/* =========================
   CARD COMPONENTS
   ========================= */

.cards-grid {
  display: grid;
  gap: 2rem;
  margin: 3rem 0;
}

@media (min-width: 768px) {
  .cards-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .cards-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.source-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  padding: 2rem;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.source-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-hover));
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.source-card:hover::before {
  opacity: 1;
}

.source-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.source-header {
  display: flex;
  align-items: center;
  margin-bottom: 1.5rem;
}

.source-icon {
  width: 2.5rem;
  height: 2.5rem;
  margin-right: 1rem;
  border-radius: var(--border-radius);
  background: var(--color-accent-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
}

.source-info h3 {
  font-family: var(--font-ui);
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
  color: var(--color-text-primary);
}

.source-date {
  font-family: var(--font-ui);
  font-size: 0.875rem;
  color: var(--color-text-muted);
  font-weight: 400;
}

.source-summary {
  color: var(--color-text-secondary);
  margin-bottom: 1.5rem;
  font-size: 1rem;
  line-height: 1.6;
}

.source-link {
  font-family: var(--font-ui);
  font-size: 0.875rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-accent);
  display: inline-flex;
  align-items: center;
}

.source-link::after {
  content: '→';
  margin-left: 0.5rem;
  transition: transform var(--transition-fast);
}

.source-card:hover .source-link::after {
  transform: translateX(4px);
}

/* =========================
   SOURCE-SPECIFIC COLORS
   ========================= */

.source-card[data-source="x-monitor"] .source-icon {
  background: linear-gradient(135deg, #1da1f2, #0d7ac7);
  color: white;
}

.source-card[data-source="github-trending"] .source-icon {
  background: linear-gradient(135deg, #333, #555);
  color: white;
}

.source-card[data-source="claude-code-changelog"] .source-icon {
  background: linear-gradient(135deg, #ff6b35, #f7931e);
  color: white;
}

/* =========================
   NAVIGATION COMPONENTS
   ========================= */

.date-nav {
  background: var(--color-surface-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  padding: 1.5rem;
  margin: 2rem 0;
}

.date-nav h4 {
  font-family: var(--font-ui);
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  margin-bottom: 1rem;
}

.date-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
}

.date-list a {
  display: block;
  padding: 0.5rem 1rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  color: var(--color-text-secondary);
  font-family: var(--font-ui);
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.date-list a:hover {
  background: var(--color-accent);
  color: white;
  border-color: var(--color-accent);
  text-decoration: none;
}

.date-list a.active {
  background: var(--color-accent);
  color: white;
  border-color: var(--color-accent);
}

/* =========================
   MARKDOWN CONTENT STYLES
   ========================= */

.markdown-content {
  max-width: none;
}

.markdown-content h1,
.markdown-content h2,
.markdown-content h3,
.markdown-content h4,
.markdown-content h5,
.markdown-content h6 {
  margin-top: 2rem;
  margin-bottom: 1rem;
}

.markdown-content h1:first-child,
.markdown-content h2:first-child,
.markdown-content h3:first-child {
  margin-top: 0;
}

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

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

.markdown-content li:last-child {
  margin-bottom: 0;
}

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

.markdown-content code {
  background: var(--color-surface-elevated);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 0.125rem 0.375rem;
  font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
  font-size: 0.875em;
  color: var(--color-text-primary);
}

.markdown-content pre {
  background: #1e1e1e;
  border-radius: var(--border-radius);
  padding: 1.5rem;
  margin: 1.5rem 0;
  overflow-x: auto;
  border: 1px solid var(--color-border);
}

.markdown-content pre code {
  background: none;
  border: none;
  padding: 0;
  color: #e6e6e6;
  font-size: 0.875rem;
}

.markdown-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 2rem 0;
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  overflow: hidden;
}

.markdown-content th,
.markdown-content td {
  border: 1px solid var(--color-border);
  padding: 0.75rem 1rem;
  text-align: left;
}

.markdown-content th {
  background: var(--color-surface-elevated);
  font-family: var(--font-ui);
  font-weight: 600;
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-secondary);
}

.markdown-content hr {
  border: none;
  height: 1px;
  background: var(--color-border);
  margin: 3rem 0;
}

/* =========================
   PAGE-SPECIFIC STYLES
   ========================= */

.page-title {
  text-align: center;
  margin: 3rem 0;
}

.page-title h1 {
  margin-bottom: 0.5rem;
}

.page-subtitle {
  font-family: var(--font-ui);
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  font-weight: 400;
}

.back-nav {
  margin: 2rem 0;
}

.back-link {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-ui);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.back-link::before {
  content: '←';
  margin-right: 0.5rem;
  transition: transform var(--transition-fast);
}

.back-link:hover {
  color: var(--color-accent);
  text-decoration: none;
}

.back-link:hover::before {
  transform: translateX(-4px);
}

/* =========================
   FOOTER
   ========================= */

.site-footer {
  margin-top: 4rem;
  padding: 2rem 0;
  border-top: 1px solid var(--color-border);
  text-align: center;
}

.footer-text {
  font-family: var(--font-ui);
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: 0;
}

/* =========================
   CUSTOM SCROLLBAR
   ========================= */

::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

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

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

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

/* =========================
   SELECTION STYLES
   ========================= */

::selection {
  background: var(--color-accent-light);
  color: var(--color-text-primary);
}

::-moz-selection {
  background: var(--color-accent-light);
  color: var(--color-text-primary);
}

/* =========================
   RESPONSIVE DESIGN
   ========================= */

@media (max-width: 768px) {
  :root {
    --container-padding: 1rem;
  }
  
  .header-nav {
    padding: 1rem 0;
  }
  
  .site-title {
    font-size: 1.5rem;
  }
  
  .source-card {
    padding: 1.5rem;
  }
  
  .source-header {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .source-icon {
    margin-right: 0;
    margin-bottom: 1rem;
  }
  
  .date-list {
    flex-direction: column;
  }
  
  .date-list a {
    text-align: center;
  }
}

/* =========================
   PRINT STYLES
   ========================= */

@media print {
  :root {
    --color-background: white;
    --color-surface: white;
    --color-text-primary: black;
    --color-text-secondary: #333;
    --color-border: #ccc;
  }
  
  .theme-toggle,
  .date-nav {
    display: none;
  }
  
  .source-card {
    break-inside: avoid;
    box-shadow: none;
    border: 1px solid #ccc;
  }
  
  a {
    color: inherit;
    text-decoration: underline;
  }
  
  .markdown-content pre {
    background: #f5f5f5;
    border: 1px solid #ccc;
  }
}

/* =========================
   LOADING STATES
   ========================= */

.loading {
  opacity: 0.6;
  pointer-events: none;
  transition: opacity var(--transition-normal);
}

.skeleton {
  background: linear-gradient(90deg, var(--color-border) 25%, transparent 50%, var(--color-border) 75%);
  background-size: 200% 100%;
  animation: loading 1.5s infinite;
}

@keyframes loading {
  0% {
    background-position: 200% 0;
  }
  100% {
    background-position: -200% 0;
  }
}