/* ==================================================================
   AX研究所 MEDIA — shared styles
   本サイト（index.html）と同じデザイントークン。paper下地・朱アクセント・明朝見出し。
   新規記事は article-template.html を複製して本文を差し替えるだけ。
================================================================== */
:root {
  --ink:        #14130F;
  --ink-2:      #2A2722;
  --ink-3:      #6F6A60;
  --ink-4:      #9C9789;
  --line:       #E4DED3;
  --line-2:     #D6CFC2;
  --paper:      #F5F1E8;
  --paper-2:    #EFEAE0;
  --paper-card: #FBF8F1;
  --white:      #FFFEFA;
  --accent:     #B83A24;
  --accent-ink: #8C2A1A;
  --accent-soft:#F2D9CF;
  --serif:      "Noto Serif JP", "游明朝", "Yu Mincho", serif;
  --sans:       "Inter", "Noto Sans JP", "游ゴシック", "Yu Gothic", system-ui, sans-serif;
  --mono:       "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --w-max:      1240px;
  --w-read:     760px;
  --pad-x:      clamp(20px, 5vw, 64px);
}

*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  font-family: var(--sans);
  font-feature-settings: "palt" 1;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; }
::selection { background: var(--ink); color: var(--paper); }

.container { width: 100%; max-width: var(--w-max); margin: 0 auto; padding: 0 var(--pad-x); }
.container--read { max-width: var(--w-read); }

/* ---------- header (light/paper変種を既定に) ---------- */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  padding: 16px var(--pad-x);
  display: flex; align-items: center; justify-content: space-between;
  color: var(--ink);
  background: rgba(245,241,232,.86);
  backdrop-filter: saturate(1.1) blur(10px);
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: baseline; gap: 12px; min-width: 0; }
.brand .mark { font-family: var(--sans); font-weight: 800; font-size: 20px; letter-spacing: .01em; white-space: nowrap; }
.brand .mark em { color: var(--accent); font-style: normal; }
.brand .sub { font-family: var(--mono); font-size: 11px; letter-spacing: .14em; color: var(--ink-4); text-transform: uppercase; }
.nav { display: flex; align-items: center; gap: 28px; }
.nav-links { display: flex; gap: 26px; }
.nav-links a { font-size: 14px; color: var(--ink-2); transition: color .18s; }
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--accent); }
@media (max-width: 860px){ .nav-links { display: none; } }
@media (max-width: 600px){
  .site-header { padding: 12px var(--pad-x); }
  .brand .sub { display: none; }
  .nav .btn-primary { padding: 9px 15px; font-size: 13px; white-space: nowrap; }
}

.btn { display: inline-flex; align-items: center; gap: 8px; font-weight: 600; font-size: 14px; border-radius: 999px; padding: 10px 20px; transition: transform .18s, background-color .18s, color .18s; }
.btn .arr { transition: transform .2s; }
.btn:hover .arr { transform: translateX(3px); }
.btn-primary { background: var(--accent); color: var(--white); }
.btn-primary:hover { background: var(--accent-ink); }
.btn-ghost { border: 1px solid var(--line-2); color: var(--ink); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }
.btn-lg { padding: 15px 30px; font-size: 15px; }

/* ---------- MEDIA hero ---------- */
.mhero { padding: 150px 0 34px; }
.eyebrow { font-family: var(--mono); font-size: 12px; letter-spacing: .22em; text-transform: uppercase; color: var(--accent); display: flex; align-items: center; gap: 10px; }
.eyebrow::before { content: ""; width: 26px; height: 1px; background: var(--accent); display: inline-block; }
.mhero h1 { font-family: var(--serif); font-weight: 600; font-size: clamp(30px, 5vw, 52px); line-height: 1.2; margin: 18px 0 0; }
.mhero h1 em { color: var(--accent); font-style: normal; }
.mhero .lede { color: var(--ink-3); font-size: clamp(15px,1.7vw,17px); margin: 16px 0 0; max-width: 620px; }

/* ---------- category chips ---------- */
.chips { display: flex; flex-wrap: wrap; gap: 10px; padding: 26px 0 6px; border-bottom: 1px solid var(--line); }
.chip { font-size: 13px; font-weight: 600; letter-spacing: .02em; padding: 8px 16px; border-radius: 999px; border: 1px solid var(--line-2); color: var(--ink-2); background: transparent; transition: all .18s; }
.chip:hover { border-color: var(--accent); color: var(--accent); }
.chip.is-active { background: var(--ink); color: var(--paper); border-color: var(--ink); }

/* ---------- card grid ---------- */
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px 26px; padding: 40px 0 20px; }
@media (max-width: 900px){ .grid { grid-template-columns: repeat(2,1fr); } }
@media (max-width: 600px){ .grid { grid-template-columns: 1fr; } }

.card { display: flex; flex-direction: column; background: var(--paper-card); border: 1px solid var(--line); border-radius: 14px; overflow: hidden; transition: transform .22s cubic-bezier(.2,.8,.25,1), box-shadow .22s, border-color .22s; }
.card:hover { transform: translateY(-6px); box-shadow: 0 18px 40px -22px rgba(20,19,15,.34); border-color: var(--line-2); }
.card.is-soon { opacity: .62; pointer-events: none; }
.card-cover { aspect-ratio: 16/9; position: relative; background: linear-gradient(135deg, #Eadfce, #E7dccb); overflow: hidden; }
.card-cover img { width: 100%; height: 100%; object-fit: cover; }
.card-cover .cat { position: absolute; left: 12px; top: 12px; font-size: 11px; font-weight: 700; letter-spacing: .04em; padding: 5px 11px; border-radius: 999px; background: var(--accent); color: var(--white); }
.card-cover.soon .cat { background: var(--ink-4); }
.card-body { padding: 18px 20px 22px; display: flex; flex-direction: column; gap: 10px; flex: 1; }
.card-body h3 { font-family: var(--serif); font-weight: 600; font-size: 19px; line-height: 1.45; margin: 0; }
.card:hover .card-body h3 { color: var(--accent); }
.card-body p { font-size: 13.5px; color: var(--ink-3); margin: 0; line-height: 1.7; }
.card-meta { margin-top: auto; padding-top: 6px; display: flex; gap: 12px; font-family: var(--mono); font-size: 11.5px; color: var(--ink-4); letter-spacing: .04em; }

/* ---------- article ---------- */
.article { padding: 140px 0 20px; }
.article-head { border-bottom: 1px solid var(--line); padding-bottom: 26px; }
.back { font-size: 13px; color: var(--ink-3); display: inline-flex; gap: 7px; align-items: center; margin-bottom: 22px; }
.back:hover { color: var(--accent); }
.article-cat { font-size: 12px; font-weight: 700; letter-spacing: .05em; color: var(--accent); }
.article h1 { font-family: var(--serif); font-weight: 700; font-size: clamp(26px,4vw,40px); line-height: 1.35; margin: 12px 0 18px; }
.article-meta { display: flex; flex-wrap: wrap; gap: 16px; font-family: var(--mono); font-size: 12px; color: var(--ink-4); letter-spacing: .04em; }
.article-cover { aspect-ratio: 16/8; border-radius: 14px; margin: 30px 0 8px; background: linear-gradient(135deg,#Eadfce,#E7dccb); overflow: hidden; }
.article-cover img { width:100%; height:100%; object-fit: cover; }

.prose { font-size: 16.5px; line-height: 1.95; color: var(--ink-2); padding: 8px 0 10px; }
.prose > * + * { margin-top: 1.25em; }
.prose h2 { font-family: var(--serif); font-weight: 600; font-size: 25px; line-height: 1.4; margin-top: 2em; padding-top: .4em; color: var(--ink); }
.prose h3 { font-family: var(--serif); font-weight: 600; font-size: 20px; margin-top: 1.7em; color: var(--ink); }
.prose strong { font-weight: 700; color: var(--ink); }
.prose a { color: var(--accent); border-bottom: 1px solid var(--accent-soft); }
.prose ul, .prose ol { padding-left: 1.3em; }
.prose li + li { margin-top: .5em; }
.prose blockquote, .callout { margin: 1.6em 0; padding: 18px 22px; background: var(--paper-card); border-left: 3px solid var(--accent); border-radius: 0 10px 10px 0; color: var(--ink-2); }
.prose figure { margin: 1.8em 0; }
.prose figure img { border-radius: 12px; border: 1px solid var(--line); }
.prose figcaption { font-size: 12.5px; color: var(--ink-4); margin-top: 8px; text-align: center; }
.ph { aspect-ratio: 16/9; border-radius: 12px; background: repeating-linear-gradient(45deg,#EDE6D9,#EDE6D9 12px,#E7dfd0 12px,#E7dfd0 24px); display:flex; align-items:center; justify-content:center; color: var(--ink-4); font-family: var(--mono); font-size: 12px; }

.author { display: flex; gap: 14px; align-items: center; margin: 40px 0 0; padding: 22px; background: var(--paper-card); border: 1px solid var(--line); border-radius: 14px; }
.author img { width: 52px; height: 52px; border-radius: 50%; object-fit: cover; background: var(--paper-2); }
.author .a-name { font-weight: 700; font-size: 15px; }
.author .a-role { font-size: 12.5px; color: var(--ink-4); font-family: var(--mono); letter-spacing: .04em; }

/* ---------- CTA band ---------- */
.cta { margin: 60px 0 70px; padding: 44px var(--pad-x); background: var(--ink); color: var(--paper); border-radius: 18px; text-align: center; }
.cta h2 { font-family: var(--serif); font-weight: 600; font-size: clamp(22px,3vw,32px); margin: 0 0 8px; }
.cta h2 em { color: #E8631A; font-style: normal; }
.cta p { color: rgba(245,241,232,.7); font-size: 14.5px; margin: 0 0 22px; }

/* ---------- footer ---------- */
.site-footer { border-top: 1px solid var(--line); background: var(--paper-2); padding: 46px var(--pad-x) 30px; }
.foot-grid { max-width: var(--w-max); margin: 0 auto; display: flex; flex-wrap: wrap; gap: 40px 64px; }
.foot-brand h4 { font-family: var(--sans); font-weight: 800; font-size: 22px; margin: 0; }
.foot-brand h4 em { color: var(--accent); font-style: normal; }
.foot-col h5 { font-family: var(--mono); font-size: 11px; letter-spacing: .14em; text-transform: uppercase; color: var(--ink-4); margin: 0 0 12px; }
.foot-col ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 8px; font-size: 13.5px; color: var(--ink-2); }
.foot-col a:hover { color: var(--accent); }
.foot-bot { max-width: var(--w-max); margin: 30px auto 0; padding-top: 18px; border-top: 1px solid var(--line); display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; font-size: 12px; color: var(--ink-4); }
.foot-bot a:hover { color: var(--accent); }

.reveal { opacity: 0; transform: translateY(16px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce){ .reveal { opacity:1; transform:none; } }