/* =========================================================================
   Kiseido Digital v2.0—Japanese-traditional design system
   Palette: washi paper, sumi ink, hanko vermilion, warm parchment grays
   ========================================================================= */

:root {
  --washi: #f5f0e6;
  --washi-light: #faf7ef;
  --washi-deep: #ede5d3;
  --sumi: #1c1816;
  --sumi-soft: #3a342e;
  --warm-gray: #6b6358;
  --parchment: #d4c8b0;
  --parchment-line: #c7b994;
  --vermilion: #8b1a1a;
  --vermilion-deep: #6e1414;
  --gold: #a98b3c;

  --font-body: "EB Garamond", Georgia, "Times New Roman", serif;
  --font-jp: "Noto Serif JP", "Yu Mincho", "Hiragino Mincho ProN", serif;

  --max-content: 880px;
  --max-wide: 1120px;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;
  --space-6: 3rem;
  --space-7: 5rem;
}

/* ---------- Reset & base ---------- */

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--washi);
  color: var(--sumi);
  font-family: var(--font-body);
  font-size: 1.125rem;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* Goban-grid background — visible but not loud */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  background-image:
    linear-gradient(rgba(28, 24, 22, 0.075) 1px, transparent 1px),
    linear-gradient(90deg, rgba(28, 24, 22, 0.075) 1px, transparent 1px);
  background-size: 38px 38px;
  background-position: -1px -1px;
}

/* Star points on the goban: nine hoshi dots overlaid on the grid */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  background-image: radial-gradient(circle at center, rgba(28, 24, 22, 0.18) 1.5px, transparent 2px);
  background-size: 152px 152px;
  background-position: 75px 75px;
}

a {
  color: var(--vermilion);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 120ms ease, color 120ms ease;
}
a:hover { border-bottom-color: var(--vermilion); }
a:focus-visible {
  outline: 2px solid var(--vermilion);
  outline-offset: 2px;
}

img { max-width: 100%; height: auto; display: block; }

h1, h2, h3, h4 {
  font-family: var(--font-body);
  font-weight: 500;
  letter-spacing: 0.005em;
  color: var(--sumi);
  margin: 0 0 var(--space-3);
  line-height: 1.25;
}
h1 { font-size: 2.5rem; }
h2 { font-size: 1.75rem; margin-top: var(--space-6); }
h3 { font-size: 1.25rem; margin-top: var(--space-5); }

/* Sumi-e brushstroke under top-level h2 (skip product-cards and TOC issue titles) */
.content h2:not(.title) {
  position: relative;
  padding-bottom: 0.45rem;
}
.content h2:not(.title)::after {
  content: "";
  display: block;
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100px;
  height: 8px;
  background-image: url("/assets/img/brushstroke.svg");
  background-repeat: no-repeat;
  background-position: left center;
  background-size: contain;
}
.hero h1, section h2[style*="text-align: center"] {
  text-align: center;
}
.hero h1::after, .content h2[style*="text-align: center"]::after {
  left: 50%;
  transform: translateX(-50%);
}

p { margin: 0 0 var(--space-3); }

/* ---------- Header ---------- */

.site-header {
  background: var(--washi);
  border-bottom: 1px solid var(--parchment);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(8px);
}
.site-header__inner {
  max-width: var(--max-wide);
  margin: 0 auto;
  padding: var(--space-3) var(--space-4);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--sumi);
  border-bottom: none;
}
.brand:hover { border-bottom: none; }

.brand__hanko {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
  background: var(--vermilion);
  color: var(--washi-light);
  font-family: var(--font-jp);
  font-weight: 600;
  font-size: 1.85rem;
  line-height: 1;
  border-radius: 2px;
  transform: rotate(-5deg);
  box-shadow:
    0 2px 4px rgba(139, 26, 26, 0.25),
    inset 0 0 0 1px rgba(110, 20, 20, 0.4);
  flex-shrink: 0;
}

.brand__wordmark {
  display: flex;
  flex-direction: column;
  line-height: 1.05;
}
.brand__name {
  font-size: 1.3rem;
  font-weight: 500;
  letter-spacing: 0.01em;
}
.brand__sub {
  font-size: 0.85rem;
  color: var(--warm-gray);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
}
.site-nav a {
  color: var(--sumi-soft);
  font-size: 0.95rem;
  letter-spacing: 0.02em;
  padding: var(--space-1) 0;
}
.site-nav a:hover { color: var(--vermilion); }
.site-nav a[aria-current="page"] {
  color: var(--vermilion);
  border-bottom-color: var(--vermilion);
}

/* ---------- Main content ---------- */

.content {
  max-width: var(--max-content);
  margin: 0 auto;
  padding: var(--space-6) var(--space-4) var(--space-7);
}
.content--wide { max-width: var(--max-wide); }

/* ---------- Hero ---------- */

.hero {
  text-align: center;
  margin-bottom: var(--space-6);
  padding: var(--space-5) 0;
  border-bottom: 1px solid var(--parchment);
}
.hero__kanji {
  font-family: var(--font-jp);
  font-size: 3rem;
  color: var(--vermilion);
  line-height: 1;
  margin-bottom: var(--space-3);
  opacity: 0.9;
}
.hero h1 {
  font-size: 2.75rem;
  margin-bottom: var(--space-3);
}
.hero__tagline {
  font-style: italic;
  color: var(--warm-gray);
  font-size: 1.15rem;
  max-width: 36rem;
  margin: 0 auto;
}

/* ---------- Section ornament (seigaiha wave divider) ---------- */

.ornament {
  margin: var(--space-6) auto;
  height: 24px;
  width: 240px;
  color: var(--vermilion);
  background-image: url("/assets/img/seigaiha.svg");
  background-repeat: no-repeat;
  background-position: center;
  background-size: contain;
  opacity: 0.85;
}

/* ---------- Cover wall (Go World Archive) ---------- */

.cover-wall {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
  gap: var(--space-3);
  margin: var(--space-5) 0;
}
.cover-wall__item {
  display: block;
  position: relative;
  background: var(--washi-light);
  padding: 6px 6px 8px;
  border: 1px solid var(--parchment);
  box-shadow: 0 1px 2px rgba(28, 24, 22, 0.06);
  transition: transform 180ms ease, box-shadow 180ms ease;
  border-bottom: 1px solid var(--parchment);
}
.cover-wall__item:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 14px rgba(28, 24, 22, 0.15);
  border-bottom-color: var(--parchment);
}
.cover-wall__item img {
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
}
.cover-wall__caption {
  display: block;
  text-align: center;
  font-size: 0.75rem;
  color: var(--warm-gray);
  margin-top: 4px;
  letter-spacing: 0.05em;
}

/* ---------- Product cards ---------- */

.products {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
  margin: var(--space-6) 0;
}
@media (min-width: 720px) {
  .products { grid-template-columns: repeat(3, 1fr); }
}

.product-card {
  background: var(--washi-light);
  border: 1px solid var(--parchment);
  border-top: 3px solid var(--vermilion);
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
}
.product-card h3 {
  margin: 0 0 var(--space-2);
  font-size: 1.25rem;
}
.product-card__meta {
  font-size: 0.85rem;
  color: var(--warm-gray);
  letter-spacing: 0.04em;
  margin-bottom: var(--space-3);
}
.product-card p {
  flex: 1;
  font-size: 0.95rem;
  margin-bottom: var(--space-4);
}
.product-card__cta {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-block;
  padding: 0.65rem 1.25rem;
  font-family: var(--font-body);
  font-size: 1rem;
  letter-spacing: 0.02em;
  border-radius: 2px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 120ms ease, color 120ms ease, border-color 120ms ease;
}
.btn--primary {
  background: var(--vermilion);
  color: var(--washi-light);
  border-color: var(--vermilion);
}
.btn--primary:hover {
  background: var(--vermilion-deep);
  border-bottom-color: var(--vermilion-deep);
  color: var(--washi-light);
}
.btn--ghost {
  background: transparent;
  color: var(--sumi);
  border-color: var(--sumi-soft);
}
.btn--ghost:hover {
  background: var(--sumi);
  color: var(--washi-light);
  border-bottom-color: var(--sumi);
}

/* ---------- Product page layout ---------- */

.product-hero {
  display: grid;
  gap: var(--space-5);
  grid-template-columns: 1fr;
  align-items: start;
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-5);
  border-bottom: 1px solid var(--parchment);
}
@media (min-width: 720px) {
  .product-hero { grid-template-columns: 220px 1fr; }
}
/* When there's no cover image (only one child), let the content span the full width */
.product-hero > :only-child { grid-column: 1 / -1; }
.product-hero__cover {
  border: 1px solid var(--parchment);
  padding: 8px;
  background: var(--washi-light);
  box-shadow: 0 2px 6px rgba(28, 24, 22, 0.08);
}
.product-hero__cover img {
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
}
.product-hero__title {
  font-family: var(--font-jp);
  font-size: 0.85rem;
  color: var(--vermilion);
  letter-spacing: 0.15em;
  margin-bottom: var(--space-2);
  text-transform: uppercase;
}
.product-hero h1 { margin-top: 0; }
.product-hero__meta {
  display: flex;
  gap: var(--space-4);
  font-size: 0.9rem;
  color: var(--warm-gray);
  margin: var(--space-3) 0 var(--space-4);
  flex-wrap: wrap;
}
.product-hero__meta strong { color: var(--sumi); font-weight: 500; }

.features {
  background: var(--washi-deep);
  padding: var(--space-4);
  border-left: 3px solid var(--vermilion);
  margin: var(--space-5) 0;
}
.features h3 { margin-top: 0; font-size: 1.05rem; }
.features ul { margin: 0; padding-left: 1.25rem; }
.features li { margin-bottom: var(--space-1); font-size: 0.95rem; }

/* ---------- Footer ---------- */

.site-footer {
  border-top: 2px solid var(--vermilion);
  background: var(--washi-light);
  margin-top: var(--space-7);
  padding: var(--space-5) var(--space-4);
}
.site-footer__inner {
  max-width: var(--max-content);
  margin: 0 auto;
  text-align: center;
  font-size: 0.9rem;
  color: var(--warm-gray);
}
.site-footer__parent {
  display: inline-block;
  margin-bottom: var(--space-3);
  border-bottom: none;
  opacity: 0.85;
  transition: opacity 120ms ease;
}
.site-footer__parent:hover { opacity: 1; border-bottom: none; }
.site-footer__parent img { display: inline-block; }
.site-footer__lede {
  font-style: italic;
  margin-bottom: var(--space-3);
}
.site-footer__meta {
  font-size: 0.8rem;
  letter-spacing: 0.05em;
}
.site-footer a {
  color: var(--warm-gray);
}
.site-footer a:hover { color: var(--vermilion); border-bottom-color: var(--vermilion); }