/* AI Wire - 静的サイト main.css */
/* 既存記事スタイル(朝刊風)と統一感を持たせる */

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

:root {
  --paper: #faf6ee;
  --paper-2: #f4ecdc;
  --ink: #1a1814;
  --ink-soft: #4a443c;
  --ink-mute: #88817a;
  --rule: #2a2620;
  --accent: #b8341e;
  --accent-soft: #f5e6e2;
  --fact-soft: #e8eef5;
  --analysis-soft: #f4ebe1;
}

html, body {
  background: var(--paper);
  color: var(--ink);
  font-family: "Noto Serif JP", "Yu Mincho", "Hiragino Mincho ProN", serif;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background-image:
    radial-gradient(rgba(0,0,0,0.015) 1px, transparent 1px),
    radial-gradient(rgba(0,0,0,0.012) 1px, transparent 1px);
  background-size: 6px 6px, 9px 9px;
  background-position: 0 0, 3px 3px;
}

a { color: var(--ink); text-decoration: none; transition: color .15s ease; }
a:hover { color: var(--accent); }

/* ===== MASTHEAD ===== */
.masthead {
  border-top: 6px solid var(--ink);
  padding: 18px 0 0;
  margin: 0 auto;
  max-width: 1180px;
}

.masthead-inner {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  padding: 0 40px;
  gap: 24px;
}

.masthead-meta-left, .masthead-meta-right {
  font-family: "Inter", sans-serif;
  font-size: 12px;
  color: var(--ink-mute);
  letter-spacing: 0.05em;
}
.masthead-meta-left { text-align: left; }
.masthead-meta-right { text-align: right; }

.masthead-title { text-align: center; }
.masthead-title .brand {
  font-family: "Playfair Display", "Noto Serif JP", serif;
  font-weight: 900;
  font-size: 56px;
  letter-spacing: -0.02em;
  line-height: 1;
}
.masthead-title .brand a { color: var(--ink); }
.masthead-title .tagline {
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-mute);
  font-family: "Inter", sans-serif;
  margin-top: 6px;
}

.cta-link {
  display: inline-block;
  padding: 6px 14px;
  border: 1px solid var(--accent);
  color: var(--accent);
  font-family: "Inter", sans-serif;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.cta-link:hover { background: var(--accent); color: var(--paper); }

/* ===== TOPNAV ===== */
.topnav {
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
  margin-top: 18px;
  padding: 12px 40px;
  display: flex;
  justify-content: center;
  gap: 32px;
  font-family: "Inter", sans-serif;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.05em;
}
.topnav a { color: var(--ink-soft); }
.topnav a:hover { color: var(--accent); }
.topnav .nav-active { color: var(--ink); border-bottom: 2px solid var(--accent); padding-bottom: 10px; margin-bottom: -12px; }
.topnav .nav-cta { color: var(--accent); }

/* ===== LEAD STORY ===== */
.lead-story {
  max-width: 1180px;
  margin: 0 auto;
  padding: 56px 40px 48px;
  border-bottom: 1px solid var(--ink);
}
.lead-story-inner { max-width: 880px; margin: 0 auto; text-align: center; }
.lead-kicker {
  display: inline-block;
  font-family: "Inter", sans-serif;
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 700;
  margin-bottom: 18px;
}
.lead-headline {
  font-family: "Noto Serif JP", serif;
  font-weight: 900;
  font-size: 44px;
  line-height: 1.25;
  letter-spacing: -0.01em;
  margin-bottom: 18px;
}
.lead-headline a { color: var(--ink); }
.lead-headline a:hover { color: var(--accent); }
.lead-summary {
  font-size: 18px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin-bottom: 24px;
}
.lead-meta {
  font-family: "Inter", sans-serif;
  font-size: 13px;
  color: var(--ink-mute);
  letter-spacing: 0.05em;
}
.lead-meta .sep { margin: 0 12px; }
.lead-meta a { color: var(--accent); font-weight: 600; }

/* ===== RECENT GRID ===== */
.recent {
  max-width: 1180px;
  margin: 0 auto;
  padding: 56px 40px;
}
.section-title {
  font-family: "Playfair Display", "Noto Serif JP", serif;
  font-weight: 700;
  font-size: 28px;
  letter-spacing: -0.01em;
  margin-bottom: 28px;
  border-bottom: 2px solid var(--ink);
  padding-bottom: 12px;
}

.recent-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 32px 28px;
}
.recent-card {
  border-top: 3px solid var(--ink);
  padding-top: 16px;
}
.recent-card .card-date {
  font-family: "Inter", sans-serif;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--ink-mute);
  text-transform: uppercase;
}
.recent-card .card-headline {
  font-family: "Noto Serif JP", serif;
  font-weight: 700;
  font-size: 20px;
  line-height: 1.35;
  margin: 8px 0 12px;
}
.recent-card .card-headline a { color: var(--ink); }
.recent-card .card-headline a:hover { color: var(--accent); }
.recent-card .card-lead {
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
}

/* ===== SUBSCRIBE CTA ===== */
.subscribe-cta {
  background: var(--paper-2);
  border-top: 6px solid var(--ink);
  border-bottom: 1px solid var(--ink);
  padding: 56px 40px;
}
.cta-inner {
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
}
.cta-inner h3 {
  font-family: "Playfair Display", "Noto Serif JP", serif;
  font-weight: 700;
  font-size: 32px;
  line-height: 1.3;
  margin-bottom: 12px;
}
.cta-inner p {
  font-size: 16px;
  color: var(--ink-soft);
  margin-bottom: 24px;
}
.signup-form {
  display: flex;
  gap: 12px;
  max-width: 520px;
  margin: 0 auto;
}
.signup-form input {
  flex: 1;
  padding: 14px 16px;
  font-size: 16px;
  font-family: inherit;
  border: 1px solid var(--ink);
  background: var(--paper);
  color: var(--ink);
}
.signup-form input:focus { outline: 2px solid var(--accent); outline-offset: -2px; }
.signup-form button {
  padding: 14px 24px;
  background: var(--ink);
  color: var(--paper);
  border: none;
  font-family: "Inter", sans-serif;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background .15s ease;
}
.signup-form button:hover { background: var(--accent); }
.signup-note {
  font-size: 13px;
  color: var(--ink-mute);
  margin-top: 12px;
  min-height: 20px;
}
.signup-note.success { color: #1f7a3a; }
.signup-note.error { color: var(--accent); }

/* ===== ARCHIVE LINK ===== */
.archive-link {
  max-width: 1180px;
  margin: 0 auto;
  padding: 56px 40px;
}
.archive-month-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 20px;
}
.archive-month {
  display: inline-block;
  padding: 8px 14px;
  border: 1px solid var(--ink);
  font-family: "Inter", sans-serif;
  font-size: 13px;
  color: var(--ink);
}
.archive-month .count {
  color: var(--ink-mute);
  font-size: 12px;
  margin-left: 6px;
}
.archive-month:hover { background: var(--ink); color: var(--paper); }
.archive-month:hover .count { color: var(--paper); }
.archive-cta { font-family: "Inter", sans-serif; font-size: 14px; }
.archive-cta a { color: var(--accent); font-weight: 600; }

/* ===== FOOTER ===== */
.site-footer {
  background: var(--ink);
  color: var(--paper);
  padding: 48px 40px;
  margin-top: 56px;
}
.footer-inner {
  max-width: 1180px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.5fr 1fr 1.5fr;
  gap: 40px;
  font-family: "Inter", sans-serif;
  font-size: 14px;
}
.footer-brand strong {
  font-family: "Playfair Display", serif;
  font-size: 24px;
  display: block;
  margin-bottom: 8px;
}
.footer-brand p { color: rgba(250,246,238,0.6); font-size: 13px; }
.footer-links { display: flex; flex-direction: column; gap: 8px; }
.footer-links a { color: rgba(250,246,238,0.8); }
.footer-links a:hover { color: var(--paper); }
.footer-meta { color: rgba(250,246,238,0.6); font-size: 13px; line-height: 1.6; }
.footer-meta .copyright { margin-top: 12px; font-size: 12px; opacity: 0.5; }

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .masthead-inner {
    grid-template-columns: 1fr;
    padding: 0 20px;
    gap: 12px;
  }
  .masthead-meta-left, .masthead-meta-right { text-align: center; }
  .masthead-title .brand { font-size: 38px; }
  .topnav { padding: 12px 20px; gap: 18px; font-size: 12px; flex-wrap: wrap; }
  .lead-story, .recent, .subscribe-cta, .archive-link { padding-left: 20px; padding-right: 20px; }
  .lead-headline { font-size: 28px; }
  .lead-summary { font-size: 16px; }
  .cta-inner h3 { font-size: 24px; }
  .signup-form { flex-direction: column; }
  .footer-inner { grid-template-columns: 1fr; gap: 24px; }
}