/* ============================================================
   SUMI — Sections : Header / Hero / Index / Quiet Depth / About / Footer
   ============================================================ */

/* ================= Header ================= */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  padding: 1.15rem var(--pad);
  background: color-mix(in srgb, var(--paper) 82%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.site-header__brand {
  font-family: var(--font-display);
  font-size: 1.35rem;
  letter-spacing: 0.34em;
  text-indent: 0.34em;
  line-height: 1;
}

.site-header__nav {
  display: flex;
  gap: 2.25rem;
}
.site-header__nav a { font-family: var(--font-mono); font-size: var(--fs-label); letter-spacing: var(--ls-label); text-transform: uppercase; }

.nav-toggle {
  display: none;
  appearance: none;
  background: none;
  border: 0;
  padding: 0.35rem 0;
  cursor: pointer;
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  letter-spacing: var(--ls-label);
  text-transform: uppercase;
}

.nav-overlay {
  position: fixed;
  inset: 0;
  z-index: 99;
  background: var(--paper);
  display: grid;
  place-content: center;
  gap: 0.5rem;
  opacity: 0;
  visibility: hidden;
  transition: opacity 480ms var(--ease), visibility 480ms;
}
.nav-overlay[data-open="true"] { opacity: 1; visibility: visible; }
.nav-overlay a {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 12vw, 4rem);
  line-height: 1.25;
}

/* ================= Hero ================= */
.hero {
  min-height: 100svh;
  padding-top: clamp(7rem, 16vh, 11rem);
  padding-bottom: 3rem;
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-rows: auto 1fr auto;
  align-items: start;
  column-gap: clamp(1rem, 4vw, 4rem);
}

.hero__title {
  grid-column: 1;
  grid-row: 1 / span 2;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: var(--fs-hero);
  line-height: 0.82;
  letter-spacing: -0.04em;
  margin-top: clamp(1rem, 6vh, 5rem);
}

/* SUMI の各文字を段階的に立ち上げる */
.hero__title span { display: inline-block; }

.hero__meta {
  grid-column: 1;
  grid-row: 2;
  align-self: end;
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
  max-width: 34ch;
}

.hero__en {
  font-family: var(--font-display);
  font-style: italic;
  font-size: clamp(1.6rem, 3.6vw, 2.8rem);
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.hero__hr {
  width: min(360px, 60%);
  margin-block: 0.25rem;
}

/* 縦書きの和文 — 一箇所だけの日本的な"間" */
.hero__vertical {
  grid-column: 2;
  grid-row: 1 / span 2;
  writing-mode: vertical-rl;
  font-family: var(--font-jp);
  font-size: clamp(1.05rem, 1.5vw, 1.35rem);
  letter-spacing: 0.42em;
  line-height: 1;
  color: var(--ink-soft);
  margin-top: 0.5rem;
  padding-left: 1.25rem;
  border-left: 1px solid var(--line);
  max-height: 60vh;
}

/* 落款（朱印） */
.seal {
  position: absolute;
  right: var(--pad);
  bottom: clamp(6rem, 22vh, 12rem);
  width: clamp(74px, 8vw, 108px);
  aspect-ratio: 1;
  display: grid;
  place-content: center;
  border: 2px solid var(--shu);
  border-radius: 3px;
  color: var(--shu);
  font-family: var(--font-jp);
  font-size: clamp(1.5rem, 2.2vw, 2.1rem);
  line-height: 1.05;
  letter-spacing: 0.08em;
  text-align: center;
  transform: rotate(-4deg);
  animation: seal-breathe 12s ease-in-out infinite;
}
.seal span { display: block; }

@keyframes seal-breathe {
  0%, 100% { transform: rotate(-4deg) scale(1); }
  50%      { transform: rotate(-2.5deg) scale(1.025); }
}

.hero__foot {
  grid-column: 1 / -1;
  grid-row: 3;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding-top: 2rem;
}

/* ================= Index（作品目録） ================= */
.index { padding-block: var(--gap-section) 0; }

.index__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding-bottom: 1.5rem;
}

.row {
  position: relative;
  display: grid;
  grid-template-columns: 5.5rem 1fr auto;
  align-items: center;
  gap: clamp(1rem, 3vw, 2.5rem);
  padding-block: clamp(1.1rem, 2.6vh, 2rem);
  border-top: 1px solid var(--line);
  overflow: hidden;
}
.row:last-child { border-bottom: 1px solid var(--line); }

/* ホバーで左から引かれる朱の罫 */
.row::before {
  content: "";
  position: absolute;
  left: 0; top: -1px;
  width: 100%; height: 1px;
  background: var(--shu);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 640ms var(--ease);
}
.row:hover::before,
.row:focus-visible::before { transform: scaleX(1); transform-origin: left; }

.row__num {
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  letter-spacing: 0.12em;
  color: var(--ink-soft);
  transition: color 420ms var(--ease);
}
.row:hover .row__num { color: var(--shu); }

.row__title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: var(--fs-row);
  line-height: 1.02;
  letter-spacing: -0.03em;
  transition: transform 640ms var(--ease);
}
.row:hover .row__title { transform: translateX(18px); }

.row__jp {
  display: block;
  font-family: var(--font-jp);
  font-size: 0.95rem;
  letter-spacing: 0.22em;
  line-height: 1;
  color: var(--ink-soft);
  margin-top: 0.65rem;
}

.row__year {
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  letter-spacing: 0.12em;
  color: var(--ink-soft);
  white-space: nowrap;
  opacity: 0.45;
  transition: opacity 420ms var(--ease);
}
.row:hover .row__year { opacity: 1; }

/* ================= Quiet Depth（唯一の暗転） ================= */
.depth {
  margin-top: var(--gap-section);
  background: var(--ink);
  color: var(--paper);
  padding-block: clamp(8rem, 22vh, 15rem);
  overflow: hidden;
}

.depth__inner {
  display: grid;
  gap: 2rem;
  justify-items: center;
  text-align: center;
  position: relative;
  z-index: 1;
}

.depth__title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(3rem, 12vw, 9rem);
  line-height: 0.95;
  letter-spacing: -0.03em;
}

.depth .label { color: color-mix(in srgb, var(--paper) 55%, transparent); }

.depth__badge {
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  letter-spacing: var(--ls-label);
  text-transform: uppercase;
  color: var(--shu-soft);
  border: 1px solid color-mix(in srgb, var(--shu-soft) 55%, transparent);
  border-radius: 2px;
  padding: 0.55rem 1.1rem;
}

/* 呼吸する同心円 */
.depth__halo {
  position: absolute;
  left: 50%; top: 50%;
  width: min(120vw, 1100px);
  aspect-ratio: 1;
  translate: -50% -50%;
  pointer-events: none;
  background:
    repeating-radial-gradient(
      circle,
      color-mix(in srgb, var(--paper) 6%, transparent) 0 1px,
      transparent 1px 78px
    );
  opacity: 0.55;
  animation: halo 14s ease-in-out infinite;
}
@keyframes halo {
  0%, 100% { transform: scale(1);    opacity: 0.4; }
  50%      { transform: scale(1.06); opacity: 0.7; }
}

/* ================= About ================= */
.about { padding-block: var(--gap-section); }

.about__grid {
  display: grid;
  grid-template-columns: 5.5rem 1fr;
  gap: clamp(1rem, 3vw, 2.5rem);
  align-items: start;
}

.about__body {
  max-width: 30ch;
  font-size: clamp(1.35rem, 2.6vw, 2.1rem);
  line-height: 1.95;
  letter-spacing: 0.02em;
}

.about__body em {
  font-family: var(--font-display);
  font-style: italic;
  color: var(--shu);
}

/* ================= Footer ================= */
.site-footer {
  border-top: 1px solid var(--line);
  padding-block: clamp(3rem, 8vh, 5rem);
}

.site-footer__grid {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 2rem 3rem;
}

.site-footer__brand {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 7vw, 4.5rem);
  line-height: 1;
  letter-spacing: -0.02em;
}

.site-footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: 1.75rem;
}
.site-footer__links a {
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  letter-spacing: var(--ls-label);
  text-transform: uppercase;
}

.site-footer__copy {
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  letter-spacing: 0.1em;
  color: var(--ink-soft);
  margin-top: 2.5rem;
}

/* ================= Responsive ================= */
@media (max-width: 900px) {
  .site-header__nav { display: none; }
  .nav-toggle { display: block; }
}

@media (max-width: 640px) {
  .hero { grid-template-columns: 1fr; }
  .hero__vertical { display: none; }
  .hero__title { grid-row: 1; }
  .hero__meta { grid-row: 2; }
  .seal { bottom: auto; top: clamp(6.5rem, 15vh, 9rem); right: var(--pad); }

  .row { grid-template-columns: 3.25rem 1fr; }
  .row__year { display: none; }

  .about__grid { grid-template-columns: 1fr; }
  .about__body { max-width: none; }
}