/* ======================================================================
   ふでばじめ (FUDEHAJIME) — Design System
   Aesthetic: "Nib & Ink — Ink-Black Ground, Ivory Leaf, Brass Slit"
   ----------------------------------------------------------------------
   Signature device:
     NIB SLIT — the V-shaped breather slit of a fountain-pen nib, rendered
     as a structural rule (linear-gradient + clip-path). It threads the
     nav, chapter markers, and the top edge of every product card the way a
     real nib's slit splits the tines. Each card opens with a "nib-slit band".
   ----------------------------------------------------------------------
   Why this is NOT generic AI-slop:
     - INK-BLACK #1A1A1A is the DOMINANT GROUND (not a light paper site with
       a dark footer). Ivory #FAFAF7 appears as inset "leaf" panels — the
       ink-on-paper contrast IS the concept (writing as a physical act).
     - Brass #A8763D is sparse metal trim, never a fill — black+brass alone
       reads as generic luxury, so the NIB-SLIT device is load-bearing
       structure, not decoration.
     - Plantin (transitional serif, first use across all 22 sites) for
       display — NOT Mincho, NOT broadsheet Didone.
     - Noto Serif JP for body, Space Mono for numerals (nib widths, indices).
     - NO Mincho-apothecary / black-pixel-neon / broadsheet defaults.
     - Hue/value quadrant distinct from site01 (espresso), site16(coral),
       site17(teal), site18(periwinkle), site19(green), site20(crimson),
       site21(Kodak yellow). Warm-brass-on-ink occupies its own corner.
   ====================================================================== */

:root {
  /* === Color: ink-black ground + ivory leaf + brass slit === */
  --ink:        #1A1A1A;  /* dominant ground / page background */
  --ink-2:      #232120;  /* raised ink surface (cards on dark) */
  --ink-3:      #2E2B28;  /* hairline-lit ink panel */
  --ivory:      #FAFAF7;  /* paper leaf (inset panels, body on dark = soft) */
  --ivory-2:    #F2EFE7;  /* aged leaf edge */
  --paper-text: #ECE7DC;  /* readable ivory text on ink ground */
  --paper-mute: #B7AF9F;  /* muted ivory on ink */

  /* Brass metal trim — sparse */
  --brass:      #A8763D;  /* nib brass */
  --brass-lit:  #C79A5A;  /* polished highlight */
  --brass-deep: #7E5826;  /* shadowed brass */

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

  /* === Spacing rhythm (nib feed channel ~ 8px module) === */
  --gap-1:  8px;
  --gap-2:  16px;
  --gap-3:  24px;
  --gap-4:  32px;
  --gap-5:  48px;
  --gap-6:  64px;
  --gap-7:  96px;
  --gap-8:  128px;

  /* === Typography === */
  /* transitional serif display: Plantin if locally licensed, else Spectral
     (Adobe-backed transitional editorial serif on Google Fonts; Plantin/Times lineage) */
  --f-display: "Plantin", "Spectral", "Noto Serif JP", Georgia, "Times New Roman", serif;
  --f-body:    "Noto Serif JP", "Spectral", Georgia, serif;                   /* editorial body */
  --f-num:     "Space Mono", "Courier New", monospace;                        /* nib widths / indices */

  --max-w: 1180px;
}

* { 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 { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; }

/* ======================================================================
   NIB-SLIT SYSTEM — the signature
   ----------------------------------------------------------------------
   .nib-slit       : the central breather slit + tine split, as a top band.
                     A brass hairline splits down the middle (the slit),
                     flanked by two ink/ivory tines, terminating in a
                     round "breather hole" via radial-gradient.
   .nib-rule       : thin horizontal slit rule used between sections.
   ====================================================================== */

/* horizontal nib-slit band: two tines parted by a brass center slit,
   with a breather hole centred at the top. Used atop each card + hero. */
.nib-slit {
  position: relative;
  height: 20px;
  background: var(--ink);
  overflow: hidden;
}
/* the parted tines (brass edges meeting at centre) */
.nib-slit::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    /* breather hole */
    radial-gradient(circle at 50% 4px, var(--ink) 3.5px, transparent 4px),
    /* the slit: a thin brass line down the centre that widens slightly */
    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));
}
/* the tine triangles via clip-path on flanking brass bars */
.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;
}

/* slim brass slit rule (divider) */
.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 — fixed top
   ====================================================================== */
.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);
}
.site-header .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: 30px;
  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: 14px;
  color: var(--brass-lit);
  letter-spacing: 0.1em;
}
.brand-mark .tag-stamp {
  font-family: var(--f-num);
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--paper-mute);
  border-left: 1px solid var(--ink-3);
  padding-left: var(--gap-2);
  text-transform: uppercase;
}

.nav-links { display: flex; gap: var(--gap-3); align-items: center; }
.nav-links a {
  font-family: var(--f-num);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--paper-text);
  padding: 4px 4px 8px;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s, color 0.15s;
}
.nav-links a:hover { border-bottom-color: var(--brass); color: var(--brass-lit); }

/* ======================================================================
   HERO — ink ground, engraved Plantin title, brass nib-slit overhead
   ====================================================================== */
.hero {
  background:
    radial-gradient(ellipse at 50% -10%, var(--ink-3), var(--ink) 60%),
    var(--ink);
  position: relative;
  overflow: hidden;
  padding: var(--gap-7) var(--gap-3) var(--gap-6);
  border-bottom: 1px solid var(--ink-3);
}
/* nib-slit threading down from the top centre of the hero */
.hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 3px;
  height: clamp(120px, 22vh, 240px);
  background: linear-gradient(180deg, var(--brass-lit), var(--brass) 30%, transparent);
}
/* breather hole at the slit's base */
.hero::after {
  content: "";
  position: absolute;
  top: clamp(118px, 22vh, 238px);
  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-frame-stamp {
  font-family: var(--f-num);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--brass-lit);
  text-transform: uppercase;
  margin-bottom: var(--gap-4);
  display: inline-block;
  border: 1px solid var(--brass-deep);
  padding: 6px 14px;
}

.hero h1 {
  font-family: var(--f-display);
  font-size: clamp(46px, 8.5vw, 108px);
  line-height: 1.0;
  letter-spacing: 0.01em;
  color: var(--ivory);
  font-weight: 600;
  font-style: italic;
  margin-bottom: var(--gap-3);
}
.hero h1 .jp {
  font-family: var(--f-body);
  font-weight: 700;
  font-size: 0.34em;
  letter-spacing: 0.04em;
  font-style: normal;
  display: block;
  margin-top: var(--gap-2);
  color: var(--paper-text);
}

.hero-tagline {
  font-family: var(--f-display);
  font-style: italic;
  font-size: clamp(19px, 2.6vw, 30px);
  color: var(--brass-lit);
  letter-spacing: 0.02em;
  margin: 0 auto var(--gap-4);
  max-width: 720px;
  line-height: 1.5;
}

.hero-lead {
  font-family: var(--f-body);
  font-size: 16.5px;
  line-height: 1.95;
  color: var(--paper-text);
  max-width: 620px;
  margin: 0 auto var(--gap-5);
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--gap-4);
  font-family: var(--f-num);
  font-size: 12px;
  color: var(--paper-mute);
  letter-spacing: 0.06em;
  border-top: 1px solid var(--ink-3);
  padding-top: var(--gap-3);
  max-width: 720px;
  margin: 0 auto;
}
.hero-meta span { display: inline-flex; align-items: center; gap: 6px; }
.hero-meta b { font-weight: 700; color: var(--brass-lit); font-size: 16px; }

/* ======================================================================
   INTRO — author's honest "私もPilotから" framing (leaf panel)
   ====================================================================== */
.intro {
  background: var(--ink);
  padding: var(--gap-6) var(--gap-3);
}
.intro-inner {
  max-width: 880px;
  margin: 0 auto;
  background: var(--ivory);
  color: var(--on-leaf);
  padding: var(--gap-5);
  position: relative;
  border: 1px solid var(--brass-deep);
}
/* a brass slit running down the left margin of the leaf */
.intro-inner::before {
  content: "";
  position: absolute;
  top: var(--gap-4);
  bottom: var(--gap-4);
  left: -1px;
  width: 3px;
  background: linear-gradient(180deg, var(--brass-lit), var(--brass) 50%, var(--brass-deep));
}
.intro-mark {
  font-family: var(--f-num);
  font-size: 12px;
  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-mark .frame-num {
  font-family: var(--f-num);
  float: right;
  font-size: 13px;
  color: var(--brass);
}
.intro-body p {
  font-size: 16.5px;
  line-height: 2.0;
  margin-bottom: var(--gap-3);
  color: var(--on-leaf-soft);
}
.intro-body p:last-child { margin-bottom: 0; }
.intro-body p strong {
  background: linear-gradient(180deg, transparent 62%, var(--brass-lit) 62%, var(--brass-lit) 92%, transparent 92%);
  font-weight: 700;
  padding: 0 2px;
}

/* ======================================================================
   LANE (chapter / section) — nib-slit rule + Plantin chapter mark
   ====================================================================== */
.lane {
  padding: var(--gap-6) var(--gap-3) var(--gap-7);
  background: var(--ink);
  border-top: 1px solid var(--ink-3);
  position: relative;
}
.lane:nth-of-type(even) {
  background: var(--ink-2);
}
.lane-inner {
  max-width: var(--max-w);
  margin: 0 auto;
}

.lane-header {
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: var(--gap-4);
  align-items: end;
  padding-bottom: var(--gap-3);
  border-bottom: 1px solid var(--brass-deep);
  margin-bottom: var(--gap-5);
}
.lane-frame {
  font-family: var(--f-num);
  font-size: 10px;
  letter-spacing: 0.18em;
  color: var(--paper-mute);
  text-transform: uppercase;
}
.lane-frame .num {
  font-family: var(--f-display);
  font-style: italic;
  display: block;
  font-size: 62px;
  color: var(--brass-lit);
  line-height: 1;
  margin-top: 4px;
}
.lane-frame .num::after {
  content: "";
  display: block;
  width: 2px;
  height: 22px;
  background: linear-gradient(180deg, var(--brass-lit), transparent);
  margin-top: 8px;
}

.lane-title-block .lane-label {
  font-family: var(--f-num);
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--brass);
  text-transform: uppercase;
  margin-bottom: 8px;
  display: inline-block;
  border: 1px solid var(--brass-deep);
  padding: 3px 10px;
}
.lane-title-block h2 {
  font-family: var(--f-display);
  font-style: italic;
  font-size: clamp(32px, 4.8vw, 54px);
  letter-spacing: 0.01em;
  line-height: 1.05;
  color: var(--ivory);
  font-weight: 600;
}
.lane-title-block .motif {
  font-family: var(--f-body);
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--paper-mute);
  margin-top: 8px;
  display: block;
}

.lane-description {
  font-size: 16px;
  line-height: 1.95;
  color: var(--paper-text);
  max-width: 780px;
  margin-bottom: var(--gap-3);
}
.lane-intro {
  font-size: 15px;
  line-height: 1.95;
  color: var(--on-leaf-soft);
  max-width: 780px;
  padding: var(--gap-3) var(--gap-4);
  background: var(--ivory);
  border-left: 3px solid var(--brass);
  margin-bottom: var(--gap-5);
}

/* ======================================================================
   CARD GRID (product cards — each opens with a nib-slit band)
   ====================================================================== */
.frames {
  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 (the signature device) */
.frame > .frame-nib {
  height: 18px;
  background: var(--ink);
  position: relative;
  flex: 0 0 auto;
}
.frame > .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;
}
.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-ownership {
  font-family: var(--f-num);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  margin-bottom: 10px;
  display: inline-block;
  width: fit-content;
  padding: 2px 8px;
  border: 1px solid var(--on-leaf-mute);
  color: var(--on-leaf-mute);
}
.frame-ownership[data-own="researched"] {
  border-color: var(--brass-deep);
  color: var(--brass-deep);
}

.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;
}

.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-family: var(--f-num);
  font-size: 14px;
  letter-spacing: 0;
}

/* ======================================================================
   FAQ — Plantin Q/A on ink ground
   ====================================================================== */
.faq {
  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(32px, 5vw, 52px);
  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;
}
.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;
}

/* ======================================================================
   FOOTER — ink slip with brass slit
   ====================================================================== */
.site-footer {
  background: var(--ink);
  color: var(--paper-text);
  padding: var(--gap-6) 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-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--gap-5);
  margin-bottom: var(--gap-5);
}
.footer-brand .wordmark {
  font-family: var(--f-display);
  font-style: italic;
  font-size: 36px;
  color: var(--ivory);
  margin-bottom: var(--gap-2);
  display: block;
  letter-spacing: 0.02em;
}
.footer-brand .tagline {
  font-family: var(--f-display);
  font-style: italic;
  font-size: 15px;
  letter-spacing: 0.02em;
  color: var(--brass-lit);
  margin-bottom: var(--gap-3);
  display: block;
}
.footer-brand p {
  font-size: 13px;
  line-height: 1.85;
  color: var(--paper-mute);
}
.footer-col h4 {
  font-family: var(--f-num);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--brass-lit);
  margin-bottom: var(--gap-2);
  padding-bottom: 6px;
  border-bottom: 1px solid var(--brass-deep);
}
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 8px; }
.footer-col a {
  font-size: 13px;
  color: var(--paper-text);
  border-bottom: 1px solid transparent;
}
.footer-col a:hover { border-bottom-color: var(--brass); color: var(--brass-lit); }

.footer-disclaimer {
  border-top: 1px solid var(--ink-3);
  padding-top: var(--gap-3);
  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);
  font-family: var(--f-num);
}

/* ======================================================================
   STATIC PAGES (about / contact / privacy / disclaimer)
   ====================================================================== */
.page {
  max-width: 720px;
  margin: 0 auto;
  padding: var(--gap-6) var(--gap-3);
}
.page-header {
  border-bottom: 1px solid var(--brass-deep);
  padding-bottom: var(--gap-3);
  margin-bottom: var(--gap-5);
}
.page-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;
}
.page-header h1 {
  font-family: var(--f-display);
  font-style: italic;
  font-size: clamp(38px, 6vw, 60px);
  letter-spacing: 0.01em;
  font-weight: 600;
  line-height: 1.05;
  color: var(--ivory);
}
.page-body h2 {
  font-family: var(--f-display);
  font-style: italic;
  font-size: 26px;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--brass-lit);
  margin: var(--gap-5) 0 var(--gap-2);
  padding-top: var(--gap-2);
  border-top: 1px solid var(--ink-3);
}
.page-body p {
  font-size: 15.5px;
  line-height: 1.95;
  color: var(--paper-text);
  margin-bottom: var(--gap-3);
}
.page-body ul {
  margin: var(--gap-2) 0 var(--gap-3) var(--gap-3);
  font-size: 15px;
  line-height: 1.9;
  color: var(--paper-text);
}
.page-body li { margin-bottom: 8px; }
.page-body a {
  border-bottom: 1px solid var(--brass);
  color: var(--brass-lit);
}

/* ======================================================================
   RESPONSIVE
   ====================================================================== */
@media (max-width: 768px) {
  .site-header .nav-rail { flex-wrap: wrap; gap: var(--gap-2); }
  .brand-mark .tag-stamp { display: none; }
  .nav-links { gap: var(--gap-2); }
  .nav-links a { font-size: 10px; padding: 4px 3px 6px; }

  .hero { padding: var(--gap-6) var(--gap-3) var(--gap-5); }
  .hero h1 { font-size: clamp(38px, 11vw, 68px); }
  .hero-tagline { font-size: 19px; }

  .intro-inner { padding: var(--gap-4) var(--gap-3); }

  .lane-header { grid-template-columns: 64px 1fr; gap: var(--gap-3); }
  .lane-frame .num { font-size: 44px; }
  .lane-title-block h2 { font-size: 30px; }

  .frames { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: var(--gap-4); }
}

@media (max-width: 480px) {
  .brand-mark .wordmark { font-size: 24px; }
  .brand-mark .jp { font-size: 12px; }
  .hero h1 { font-size: clamp(34px, 12vw, 56px); }
  .hero-lead { font-size: 15px; }
  .lane-frame .num { font-size: 36px; }
  .lane-title-block h2 { font-size: 27px; }
}