/*
Theme Name: AI Quotidia
Theme URI: https://ai.quotidia.jp
Description: Minimal news media theme optimized for AI content + 3-mode reading
Version: 1.0
Author: Quotidia
Text Domain: ai-quotidia
*/

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

:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif;
  --font-serif: "Hiragino Mincho ProN", "Noto Serif JP", Georgia, serif;
  --color-bg: #fafafa;
  --color-surface: #ffffff;
  --color-text: #1a1a1a;
  --color-text-muted: #6b7280;
  --color-accent: #2563eb;
  --color-accent-hover: #1d4ed8;
  --color-border: #e5e7eb;
  --color-cta-bg: #111827;
  --color-cta-text: #ffffff;
  --max-width: 720px;
  --max-width-wide: 1080px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 32px;
  --spacing-xl: 48px;
  --radius: 8px;
}

html { font-size: 16px; scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--color-accent); text-decoration: none; }
a:hover { color: var(--color-accent-hover); text-decoration: underline; }
img { max-width: 100%; height: auto; display: block; }

/* === Layout === */
.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-md) 0;
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(8px);
  background: rgba(255,255,255,0.95);
}
.site-header__inner {
  max-width: var(--max-width-wide);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.site-title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-text);
}
.site-title a { color: inherit; }
.site-title a:hover { text-decoration: none; }
.site-nav { display: flex; gap: var(--spacing-md); font-size: 0.875rem; }
.site-nav a { color: var(--color-text-muted); font-weight: 500; }
.site-nav a:hover { color: var(--color-text); text-decoration: none; }

.site-main {
  max-width: var(--max-width);
  margin: var(--spacing-xl) auto;
  padding: 0 var(--spacing-lg);
}

.site-footer {
  max-width: var(--max-width-wide);
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-lg);
  border-top: 1px solid var(--color-border);
  text-align: center;
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

/* === Article Card (Archive) === */
.article-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
  transition: box-shadow 0.15s, transform 0.15s;
}
.article-card:hover {
  box-shadow: 0 4px 12px rgba(0,0,0,0.06);
  transform: translateY(-1px);
}
.article-card__category {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-accent);
  margin-bottom: var(--spacing-sm);
}
.article-card__title {
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: var(--spacing-sm);
}
.article-card__title a { color: var(--color-text); }
.article-card__title a:hover { color: var(--color-accent); text-decoration: none; }
.article-card__excerpt {
  font-size: 0.925rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: var(--spacing-md);
}
.article-card__meta {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

/* === Single Article === */
.entry-header {
  margin-bottom: var(--spacing-xl);
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
}
.entry-title {
  font-size: 1.75rem;
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.02em;
  margin-bottom: var(--spacing-md);
}
.entry-meta {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* === Mode Switcher === */
.mode-switcher {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: var(--spacing-lg) 0;
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}
.mode-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.mode-btn {
  padding: 6px 16px;
  border: 1px solid var(--color-border);
  border-radius: 20px;
  cursor: pointer;
  background: var(--color-surface);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: all 0.15s;
}
.mode-btn:hover {
  border-color: var(--color-text);
  color: var(--color-text);
}
.mode-btn.active {
  background: var(--color-cta-bg);
  color: var(--color-cta-text);
  border-color: var(--color-cta-bg);
}

/* === Article Body (Content) === */
.article-body {
  font-size: 1.05rem;
  line-height: 1.9;
}
.article-body[data-mode="bungo"] {
  font-family: var(--font-serif);
  font-size: 1.08rem;
  line-height: 2.1;
}
.article-body h2 {
  font-size: 1.35rem;
  font-weight: 700;
  margin: var(--spacing-xl) 0 var(--spacing-md);
  padding-bottom: var(--spacing-sm);
  border-bottom: 2px solid var(--color-border);
}
.article-body h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin: var(--spacing-lg) 0 var(--spacing-sm);
}
.article-body p {
  margin-bottom: 1.5em;
}
.article-body ul, .article-body ol {
  margin: 1em 0 1.5em 1.5em;
}
.article-body li {
  margin-bottom: 0.5em;
}
.article-body blockquote {
  border-left: 3px solid var(--color-accent);
  padding-left: var(--spacing-md);
  margin: 1.5em 0;
  color: var(--color-text-muted);
  font-style: italic;
}
.article-body code {
  background: #f3f4f6;
  padding: 2px 6px;
  border-radius: 3px;
  font-size: 0.9em;
}

/* === CTA Box (Affiliate) === */
.cta-box {
  background: linear-gradient(135deg, #f8fafc 0%, #eef2ff 100%);
  border: 1px solid #c7d2fe;
  border-radius: var(--radius);
  padding: var(--spacing-lg);
  margin: var(--spacing-lg) 0;
  text-align: center;
}
.cta-box__title {
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text);
}
.cta-box__btn {
  display: inline-block;
  padding: 10px 28px;
  background: var(--color-accent);
  color: #fff;
  border-radius: 6px;
  font-weight: 600;
  font-size: 0.9rem;
  transition: background 0.15s;
}
.cta-box__btn:hover {
  background: var(--color-accent-hover);
  color: #fff;
  text-decoration: none;
}

/* === Source Link === */
.source-link {
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--color-border);
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* === Responsive === */
@media (max-width: 640px) {
  .site-main { padding: 0 var(--spacing-md); margin: var(--spacing-lg) auto; }
  .entry-title { font-size: 1.4rem; }
  .article-body { font-size: 1rem; }
  .mode-switcher { flex-wrap: wrap; padding: var(--spacing-sm) var(--spacing-md); }
  .mode-label { width: 100%; margin-bottom: 4px; }
  .article-card { padding: var(--spacing-md); }
}

/* === Mode Hint (first visit) === */
.mode-hint {
  font-size: 0.75rem;
  color: var(--color-accent);
  font-weight: 500;
  margin-left: auto;
  transition: opacity 0.5s;
  animation: hint-pulse 2s ease-in-out 3;
}
@keyframes hint-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

/* === Related Articles === */
.related-articles {
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-xl);
  border-top: 1px solid var(--color-border);
}
.related-articles__title {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-md);
}
.related-articles__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-md);
}
@media (max-width: 640px) {
  .related-articles__grid { grid-template-columns: 1fr; }
}
.related-card {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: var(--spacing-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: border-color 0.15s, box-shadow 0.15s;
  text-decoration: none;
}
.related-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.08);
  text-decoration: none;
}
.related-card__date {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}
.related-card__title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.4;
}