/* ======================================================================
   ふでばじめ (FUDEHAJIME) — Article: Pilot 入門3機種比較ガイド
   Inherits design system tokens from the hub; self-contained for perf.
   ====================================================================== */

:root {
  /* === Color: ink-black ground + ivory leaf + brass slit === */
  --ink:        #1A1A1A;
  --ink-2:      #232120;
  --ink-3:      #2E2B28;
  --ivory:      #FAFAF7;
  --ivory-2:    #F2EFE7;
  --paper-text: #ECE7DC;
  --paper-mute: #B7AF9F;

  /* Brass metal trim */
  --brass:      #A8763D;
  --brass-lit:  #C79A5A;
  --brass-deep: #7E5826;

  /* Ink-on-ivory text */
  --on-leaf:        #1A1A1A;
  --on-leaf-soft:   #2D2A26;
  --on-leaf-mute:   #5C564C;
  --rule-leaf:      #D8D2C4;

  /* === Spacing rhythm === */
  --gap-1:  8px;
  --gap-2:  16px;
  --gap-3:  24px;
  --gap-4:  32px;
  --gap-5:  48px;
  --gap-6:  64px;
  --gap-7:  96px;

  /* === Typography === */
  --f-display: "Plantin", "Spectral", "Noto Serif JP", Georgia, "Times New Roman", serif;
  --f-body:    "Noto Serif JP", "Spectral", Georgia, serif;
  --f-num:     "Space Mono", "Courier New", monospace;

  --max-w: 1080px;
  --max-w-prose: 780px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--f-body);
  background: var(--ink);
  color: var(--paper-text);
  line-height: 1.85;
  font-size: 16px;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  font-feature-settings: "palt" 1;
}

img { display: block; }
a { color: inherit; text-decoration: none; }

/* ======================================================================
   NIB-SLIT SYSTEM — signature device (copied from hub style.css)
   ====================================================================== */

.nib-slit {
  position: relative;
  height: 20px;
  background: var(--ink);
  overflow: hidden;
}
.nib-slit::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 50% 4px, var(--ink) 3.5px, transparent 4px),
    linear-gradient(90deg,
      transparent calc(50% - 1px),
      var(--brass) calc(50% - 1px),
      var(--brass-lit) 50%,
      var(--brass) calc(50% + 1px),
      transparent calc(50% + 1px));
}
.nib-slit::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, var(--brass-deep), transparent 70%);
  clip-path: polygon(0 0, calc(50% - 7px) 0, 50% 100%, calc(50% + 7px) 0, 100% 0, 100% 100%, 0 100%);
  opacity: 0.5;
}

.nib-rule {
  height: 3px;
  background:
    radial-gradient(circle at 50% 50%, var(--brass-lit) 2px, transparent 2.5px),
    linear-gradient(90deg, transparent, var(--brass) 35%, var(--brass-lit) 50%, var(--brass) 65%, transparent);
  background-repeat: no-repeat;
}

/* ======================================================================
   PR / 開示 BANNER
   ====================================================================== */
.pr-banner {
  background: var(--ink-2);
  color: var(--brass-lit);
  font-family: var(--f-num);
  font-size: 11px;
  letter-spacing: 0.16em;
  padding: 8px var(--gap-3);
  text-align: center;
  border-bottom: 1px solid var(--brass-deep);
}
.pr-banner strong { color: var(--brass-lit); letter-spacing: 0.2em; }

/* ======================================================================
   HEADER / NAV
   ====================================================================== */
.site-header {
  background: var(--ink);
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid var(--ink-3);
}
.nav-rail {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--gap-2) var(--gap-3);
  max-width: var(--max-w);
  margin: 0 auto;
}
.brand-mark {
  display: flex;
  align-items: baseline;
  gap: var(--gap-2);
}
.brand-mark .wordmark {
  font-family: var(--f-display);
  font-size: 26px;
  letter-spacing: 0.02em;
  color: var(--ivory);
  line-height: 1;
  font-weight: 600;
  font-style: italic;
}
.brand-mark .jp {
  font-family: var(--f-body);
  font-weight: 600;
  font-size: 13px;
  color: var(--brass-lit);
  letter-spacing: 0.1em;
}
.nav-back {
  font-family: var(--f-num);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--paper-mute);
  border-bottom: 1px solid var(--brass-deep);
  padding-bottom: 2px;
  transition: color 0.15s, border-color 0.15s;
}
.nav-back:hover { color: var(--brass-lit); border-bottom-color: var(--brass-lit); }

/* ======================================================================
   BREADCRUMB
   ====================================================================== */
.breadcrumb {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: var(--gap-2) var(--gap-3);
}
.breadcrumb ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  font-family: var(--f-num);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--paper-mute);
}
.breadcrumb li + li::before { content: "›"; margin-right: 6px; color: var(--brass-deep); }
.breadcrumb a { color: var(--brass); border-bottom: 1px solid var(--brass-deep); }
.breadcrumb a:hover { color: var(--brass-lit); }

/* ======================================================================
   ARTICLE HERO
   ====================================================================== */
.article-hero {
  background:
    radial-gradient(ellipse at 50% -10%, var(--ink-3), var(--ink) 60%),
    var(--ink);
  position: relative;
  overflow: hidden;
  padding: var(--gap-6) var(--gap-3) var(--gap-5);
  border-bottom: 1px solid var(--ink-3);
}
/* nib slit threading down from the top centre */
.article-hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 3px;
  height: clamp(80px, 16vh, 180px);
  background: linear-gradient(180deg, var(--brass-lit), var(--brass) 30%, transparent);
}
.article-hero::after {
  content: "";
  position: absolute;
  top: clamp(78px, 16vh, 178px);
  left: 50%;
  transform: translateX(-50%);
  width: 9px;
  height: 9px;
  border-radius: 50%;
  border: 1.5px solid var(--brass);
  background: var(--ink);
}

.hero-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  position: relative;
  z-index: 1;
  text-align: center;
}

.hero-stamp {
  font-family: var(--f-num);
  font-size: 10px;
  letter-spacing: 0.22em;
  color: var(--brass-lit);
  text-transform: uppercase;
  margin-bottom: var(--gap-3);
  display: inline-block;
  border: 1px solid var(--brass-deep);
  padding: 5px 12px;
}

.article-hero h1 {
  font-family: var(--f-display);
  font-size: clamp(32px, 5.5vw, 72px);
  line-height: 1.05;
  letter-spacing: 0.01em;
  color: var(--ivory);
  font-weight: 600;
  font-style: italic;
  margin-bottom: var(--gap-3);
}

.hero-sub {
  font-family: var(--f-display);
  font-style: italic;
  font-size: clamp(14px, 2vw, 20px);
  color: var(--brass-lit);
  letter-spacing: 0.02em;
  margin: 0 auto var(--gap-3);
  max-width: 640px;
  line-height: 1.6;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--gap-3);
  font-family: var(--f-num);
  font-size: 11px;
  color: var(--paper-mute);
  letter-spacing: 0.06em;
  border-top: 1px solid var(--ink-3);
  padding-top: var(--gap-2);
  max-width: 640px;
  margin: 0 auto;
}

/* ======================================================================
   ARTICLE SECTIONS
   ====================================================================== */
.article-section {
  padding: var(--gap-5) var(--gap-3);
  border-top: 1px solid var(--ink-3);
}
.section-inner {
  max-width: var(--max-w);
  margin: 0 auto;
}

.section-stamp {
  font-family: var(--f-num);
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--brass);
  text-transform: uppercase;
  margin-bottom: var(--gap-2);
  display: block;
}

.article-section h2 {
  font-family: var(--f-display);
  font-style: italic;
  font-size: clamp(26px, 3.8vw, 44px);
  font-weight: 600;
  color: var(--ivory);
  letter-spacing: 0.01em;
  line-height: 1.1;
  margin-bottom: var(--gap-4);
}

.body-text {
  font-size: 16px;
  line-height: 2.0;
  color: var(--paper-text);
  max-width: var(--max-w-prose);
  margin-bottom: var(--gap-3);
}

/* ======================================================================
   INTRO (leaf panel)
   ====================================================================== */
.intro-leaf {
  background: var(--ivory);
  color: var(--on-leaf);
  padding: var(--gap-4) var(--gap-5);
  border: 1px solid var(--brass-deep);
  position: relative;
  max-width: var(--max-w-prose);
  margin-bottom: var(--gap-5);
}
.intro-leaf::before {
  content: "";
  position: absolute;
  top: var(--gap-3);
  bottom: var(--gap-3);
  left: -1px;
  width: 3px;
  background: linear-gradient(180deg, var(--brass-lit), var(--brass) 50%, var(--brass-deep));
}
.intro-leaf .leaf-mark {
  font-family: var(--f-num);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--on-leaf-mute);
  text-transform: uppercase;
  border-bottom: 1px solid var(--rule-leaf);
  padding-bottom: var(--gap-2);
  margin-bottom: var(--gap-3);
}
.intro-leaf p {
  font-size: 15.5px;
  line-height: 2.0;
  color: var(--on-leaf-soft);
  margin-bottom: var(--gap-3);
}
.intro-leaf p:last-child { margin-bottom: 0; }
.intro-leaf strong {
  background: linear-gradient(180deg, transparent 62%, var(--brass-lit) 62%, var(--brass-lit) 92%, transparent 92%);
  font-weight: 700;
  padding: 0 2px;
}

/* ======================================================================
   PRODUCT CARDS — 3カード (copied structure from hub .frame)
   ====================================================================== */
.frames-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--gap-4);
}

.frame {
  background: var(--ivory);
  border: 1px solid var(--brass-deep);
  position: relative;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: transform 0.18s, box-shadow 0.18s;
}
.frame:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 0 -2px var(--brass-deep), 0 14px 30px rgba(0,0,0,0.4);
}

/* nib-slit band across the top of each card */
.frame-nib {
  height: 18px;
  background: var(--ink);
  position: relative;
  flex: 0 0 auto;
}
.frame-nib::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 50% 3px, var(--ink) 3px, transparent 3.5px),
    linear-gradient(90deg,
      transparent calc(50% - 0.9px),
      var(--brass) calc(50% - 0.9px),
      var(--brass-lit) 50%,
      var(--brass) calc(50% + 0.9px),
      transparent calc(50% + 0.9px));
}

.frame-id {
  position: absolute;
  top: 26px;
  right: 12px;
  font-family: var(--f-num);
  font-size: 11px;
  color: var(--on-leaf-mute);
  letter-spacing: 0.08em;
  z-index: 2;
  background: var(--ivory);
  padding: 2px 6px;
  border: 1px solid var(--rule-leaf);
}

.frame-image {
  background: var(--ivory-2);
  padding: var(--gap-3);
  border-bottom: 1px solid var(--rule-leaf);
  aspect-ratio: 4/3;
  display: flex;
  align-items: center;
  justify-content: center;
}
/* tick-146/148 fix: width+height+object-fit:contain — never max-width/max-height only */
.frame-image img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  mix-blend-mode: multiply;
}

.frame-body {
  padding: var(--gap-3);
  display: flex;
  flex-direction: column;
  flex: 1;
}

.frame-tag {
  font-family: var(--f-num);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin-bottom: 10px;
  display: inline-block;
  width: fit-content;
  padding: 2px 8px;
  border: 1px solid var(--brass-deep);
  color: var(--brass-deep);
}
.frame-tag[data-own="hands-on"] {
  border-color: var(--brass);
  color: var(--brass);
}

.frame-name {
  font-family: var(--f-display);
  font-weight: 600;
  font-size: 16px;
  line-height: 1.45;
  color: var(--on-leaf);
  margin-bottom: var(--gap-2);
  letter-spacing: 0.01em;
}

.frame-reason {
  font-family: var(--f-body);
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--on-leaf-soft);
  margin-bottom: var(--gap-3);
  flex: 1;
}

/* spec table inside card */
.frame-spec {
  width: 100%;
  border-collapse: collapse;
  font-size: 12px;
  font-family: var(--f-num);
  color: var(--on-leaf-soft);
  margin-bottom: var(--gap-3);
  border-top: 1px solid var(--rule-leaf);
  border-bottom: 1px solid var(--rule-leaf);
}
.frame-spec tr { border-bottom: 1px dotted var(--rule-leaf); }
.frame-spec tr:last-child { border-bottom: none; }
.frame-spec th {
  text-align: left;
  padding: 5px 6px;
  font-weight: 400;
  color: var(--on-leaf-mute);
  white-space: nowrap;
  width: 38%;
}
.frame-spec td {
  padding: 5px 6px;
  font-size: 11.5px;
  line-height: 1.5;
}

.frame-cta {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: var(--ink);
  color: var(--brass-lit);
  font-family: var(--f-num);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 13px 16px;
  border: 1px solid var(--ink);
  width: 100%;
  justify-content: center;
  transition: background 0.15s, color 0.15s;
}
.frame-cta:hover { background: var(--brass); color: var(--ink); border-color: var(--brass); }
.frame-cta::after { content: "→"; font-size: 14px; letter-spacing: 0; }

/* hands-on badge */
.hands-on-note {
  font-family: var(--f-num);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--brass-deep);
  background: var(--ivory-2);
  border: 1px solid var(--brass-deep);
  padding: 6px 10px;
  margin-bottom: var(--gap-2);
  line-height: 1.6;
}

/* ======================================================================
   SELECTION AXIS (4軸)
   ====================================================================== */
.axis-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--gap-3);
  max-width: var(--max-w);
}

.axis-card {
  background: var(--ink-2);
  border: 1px solid var(--ink-3);
  padding: var(--gap-3);
  border-top: 3px solid var(--brass);
}
.axis-num {
  font-family: var(--f-num);
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--brass);
  margin-bottom: 8px;
  display: block;
}
.axis-card h3 {
  font-family: var(--f-display);
  font-style: italic;
  font-size: 18px;
  color: var(--ivory);
  font-weight: 600;
  margin-bottom: var(--gap-2);
  letter-spacing: 0.01em;
}
.axis-card p {
  font-size: 14px;
  line-height: 1.9;
  color: var(--paper-text);
}

/* ======================================================================
   SCENE MATRIX TABLE
   ====================================================================== */
.matrix-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin-top: var(--gap-3);
}
.matrix-note {
  font-family: var(--f-num);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--paper-mute);
  margin-bottom: var(--gap-2);
}

.matrix-table {
  width: 100%;
  min-width: 540px;
  border-collapse: collapse;
  font-family: var(--f-body);
  font-size: 14px;
  background: var(--ink-2);
  border: 1px solid var(--ink-3);
}
.matrix-table th {
  background: var(--ink-3);
  padding: 10px 12px;
  font-family: var(--f-num);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--paper-text);
  text-align: center;
  font-weight: 400;
  border-bottom: 1px solid var(--brass-deep);
}
.matrix-table th.col-scene { text-align: left; }
.matrix-table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--ink-3);
  border-right: 1px solid var(--ink-3);
  vertical-align: top;
  text-align: center;
  line-height: 1.6;
}
.matrix-table td.col-scene {
  text-align: left;
  color: var(--paper-text);
  font-size: 14px;
  border-right: 1px solid var(--brass-deep);
}
.matrix-table td .note-sm {
  display: block;
  font-size: 11px;
  color: var(--paper-mute);
  font-family: var(--f-num);
  letter-spacing: 0.04em;
  margin-top: 3px;
}
.matrix-table tr:last-child td { border-bottom: none; }

.mark-best  { color: var(--brass-lit); font-weight: 700; font-size: 17px; }
.mark-good  { color: var(--paper-text); font-size: 16px; }
.mark-cond  { color: var(--paper-mute); font-size: 15px; }

/* ======================================================================
   FAQ
   ====================================================================== */
.faq-section {
  padding: var(--gap-6) var(--gap-3);
  background: var(--ink-2);
  border-top: 1px solid var(--ink-3);
}
.faq-inner {
  max-width: 880px;
  margin: 0 auto;
}
.faq-header {
  margin-bottom: var(--gap-5);
  padding-bottom: var(--gap-3);
  border-bottom: 1px solid var(--brass-deep);
}
.faq-header .stamp {
  font-family: var(--f-num);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--brass);
  text-transform: uppercase;
  margin-bottom: 8px;
  display: block;
}
.faq-header h2 {
  font-family: var(--f-display);
  font-style: italic;
  font-size: clamp(28px, 4.5vw, 48px);
  font-weight: 600;
  color: var(--ivory);
  letter-spacing: 0.01em;
  line-height: 1.05;
}
.qa {
  border-bottom: 1px solid var(--ink-3);
  padding: var(--gap-4) 0;
}
.qa:last-child { border-bottom: none; }
.qa-q {
  font-family: var(--f-display);
  font-weight: 600;
  font-size: 18px;
  color: var(--ivory);
  margin-bottom: var(--gap-2);
  display: flex;
  align-items: baseline;
  gap: 12px;
}
.qa-q::before {
  content: "Q";
  font-family: var(--f-display);
  font-style: italic;
  font-size: 28px;
  color: var(--brass-lit);
  line-height: 1;
  flex-shrink: 0;
}
.qa-a {
  font-family: var(--f-body);
  font-size: 15px;
  line-height: 1.95;
  color: var(--paper-text);
  padding-left: 36px;
  position: relative;
}
.qa-a::before {
  content: "A";
  position: absolute;
  left: 0;
  top: -2px;
  font-family: var(--f-display);
  font-style: italic;
  font-size: 22px;
  color: var(--brass);
  line-height: 1;
}

/* ======================================================================
   RELATED / NAV (article footer links)
   ====================================================================== */
.related-section {
  padding: var(--gap-5) var(--gap-3);
  background: var(--ink);
  border-top: 1px solid var(--ink-3);
}
.related-inner {
  max-width: var(--max-w);
  margin: 0 auto;
}
.related-stamp {
  font-family: var(--f-num);
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--brass);
  text-transform: uppercase;
  margin-bottom: var(--gap-3);
  display: block;
}
.related-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--gap-3);
}
.related-link {
  font-family: var(--f-num);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--paper-text);
  border: 1px solid var(--ink-3);
  padding: 10px 18px;
  transition: border-color 0.15s, color 0.15s;
}
.related-link:hover { border-color: var(--brass); color: var(--brass-lit); }

/* ======================================================================
   FOOTER
   ====================================================================== */
.site-footer {
  background: var(--ink);
  color: var(--paper-text);
  padding: var(--gap-5) var(--gap-3) var(--gap-4);
  border-top: 1px solid var(--ink-3);
  position: relative;
}
.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 50%;
  transform: translateX(-50%);
  width: 60%;
  height: 3px;
  background:
    radial-gradient(circle at 50% 50%, var(--brass-lit) 2px, transparent 2.5px),
    linear-gradient(90deg, transparent, var(--brass) 35%, var(--brass-lit) 50%, var(--brass) 65%, transparent);
  background-repeat: no-repeat;
}
.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
}
.footer-disclaimer {
  font-family: var(--f-num);
  font-size: 11px;
  letter-spacing: 0.03em;
  color: var(--paper-mute);
  line-height: 1.75;
}
.footer-disclaimer .updated {
  display: inline-block;
  margin-right: var(--gap-3);
  color: var(--brass-lit);
}
.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--gap-3);
  margin-bottom: var(--gap-3);
  padding-bottom: var(--gap-3);
  border-bottom: 1px solid var(--ink-3);
}
.footer-nav a {
  font-family: var(--f-num);
  font-size: 12px;
  color: var(--paper-mute);
  letter-spacing: 0.08em;
  border-bottom: 1px solid transparent;
  transition: color 0.15s, border-color 0.15s;
}
.footer-nav a:hover { color: var(--brass-lit); border-bottom-color: var(--brass); }

/* ======================================================================
   RESPONSIVE
   ====================================================================== */
@media (max-width: 768px) {
  .nav-rail { flex-wrap: wrap; gap: var(--gap-2); }
  .article-hero { padding: var(--gap-5) var(--gap-3) var(--gap-4); }
  .article-hero h1 { font-size: clamp(28px, 8.5vw, 52px); }
  .hero-sub { font-size: 14px; }
  .frames-grid { grid-template-columns: 1fr; }
  .axis-grid { grid-template-columns: 1fr; }
  .intro-leaf { padding: var(--gap-3); }
}

@media (max-width: 480px) {
  .brand-mark .wordmark { font-size: 22px; }
  .article-hero h1 { font-size: clamp(24px, 10vw, 40px); }
}