/*
Theme Name: Nakano
Theme URI: https://shinsukenakano.com
Author: Shinsuke Nakano
Author URI: https://shinsukenakano.com
Description: 静止した索引。ミニマルな個人ポートフォリオのための WordPress テーマ。
Version: 2.4.0
Requires at least: 6.0
Tested up to: 6.8
Requires PHP: 7.4
License: GNU General Public License v2 or later
Text Domain: nakano
Tags: portfolio, minimal, one-column, custom-colors
*/

/* ============================================================
   00 — TOKENS
   ============================================================ */
:root{
  /* paper & ink */
  --paper:      #ececec;
  --paper-sunk: #e3e3e3;
  --ink:        #171717;
  --ink-60:     #6d6d6b;
  --ink-40:     #9b9b99;
  --rule:       #d1d1d1;
  --rule-hard:  #b9b9b9;

  /* accent — 作品ページのヒーローだけで使う差し色 */
  --accent:     #9c2530;
  --accent-ink: #f3e9e7;

  /* accent-blue — TOP画面をスクロールした時のヘッダー用 */
  --accent-blue:     #1e3a8a;
  --accent-blue-ink: #eef2ff;

  /* 0〜1。TOP画面でJSがスクロール量に応じて連続的に書き換える */
  --scroll-t: 0;

  /* type */
  --display: "Schibsted Grotesk", "Zen Kaku Gothic New", -apple-system, BlinkMacSystemFont, "Helvetica Neue", sans-serif;
  --sans:    "Zen Kaku Gothic New", -apple-system, BlinkMacSystemFont, "Helvetica Neue", "Hiragino Sans", sans-serif;
  --mono:    "IBM Plex Mono", ui-monospace, "SFMono-Regular", monospace;
  --serif:   "Shippori Mincho", "Zen Old Mincho", "Hiragino Mincho ProN", "EB Garamond", serif;

  /* metrics */
  --pad:      clamp(18px, 4.2vw, 64px);
  --measure:  34rem;   /* 表紙や About の短い本文 */
  --column:   64rem;   /* 記事の版面 */
  --text:     44rem;   /* 記事の字面（画像はこれより広げられる） */
  --rail:     clamp(80px, 12vw, 190px);   /* mono ラベル列の幅 */
  --ease:     cubic-bezier(.22,.61,.36,1);
  --slow:     .9s;
}

/* ============================================================
   01 — RESET
   ============================================================ */
*,*::before,*::after{ box-sizing:border-box; }
html{ -webkit-text-size-adjust:100%; scroll-behavior:smooth; }
html.nk-smooth{ scroll-behavior:auto; }
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--sans);
  font-weight:400;
  font-size:15px;
  line-height:2.05;
  letter-spacing:.02em;
  font-feature-settings:"palt" 1;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
img,svg,video{ max-width:100%; height:auto; display:block; }
a{ color:inherit; text-decoration:none; }
button{ font:inherit; color:inherit; background:none; border:0; padding:0; cursor:pointer; }
h1,h2,h3,h4,p,figure,blockquote{ margin:0; }
ul,ol{ margin:0; padding:0; list-style:none; }
::selection{ background:var(--ink); color:var(--paper); }

:focus-visible{
  outline:1px solid var(--ink);
  outline-offset:4px;
}

.screen-reader-text{
  position:absolute; width:1px; height:1px; overflow:hidden;
  clip:rect(0 0 0 0); clip-path:inset(50%); white-space:nowrap;
}
.skip-link{
  position:fixed; top:8px; left:8px; z-index:999;
  background:var(--ink); color:var(--paper);
  padding:8px 14px; font-family:var(--mono); font-size:11px;
  transform:translateY(-200%);
}
.skip-link:focus{ transform:none; }

/* ============================================================
   02 — TYPE ROLES
   ============================================================ */
.mono{
  font-family:var(--mono);
  font-size:11px;
  letter-spacing:.14em;
  text-transform:uppercase;
  line-height:1.6;
  color:var(--ink-60);
  font-weight:400;
}
.mono--ink{ color:var(--ink); }
.display-face{ font-family:var(--display); font-weight:500; letter-spacing:-.03em; }

.display{
  font-family:var(--display);
  font-weight:500;
  font-size:clamp(1.45rem, 3.1vw, 2.5rem);
  line-height:1;
  letter-spacing:-.035em;
  text-transform:lowercase;
  white-space:nowrap;
}

.lede{
  font-size:clamp(.95rem, 1.5vw, 1.06rem);
  line-height:2.15;
  max-width:var(--measure);
  color:var(--ink);
}

/* ============================================================
   03 — SHELL
   ============================================================ */
.shell{ padding-inline:var(--pad); }
.rule{ height:1px; background:var(--rule); border:0; margin:0; }

.masthead{
  position:fixed; inset:0 0 auto 0; z-index:60;
  display:flex; align-items:center; justify-content:space-between;
  gap:16px;
  padding:16px var(--pad);
  background:color-mix(in srgb, var(--paper) 86%, transparent);
  backdrop-filter:blur(9px) saturate(120%);
  -webkit-backdrop-filter:blur(9px) saturate(120%);
  border-bottom:1px solid transparent;
}
.masthead.is-stuck{ border-bottom-color:var(--rule); }

/* TOP画面：スクロール量(--scroll-t, 0〜1)に応じて配色トークンを
   紙色→紺青へ連続的にブレンドする。ヘッダーもページ本体も
   同じ --paper / --ink 系の変数を参照しているので、この一箇所を
   書き換えるだけで両方が同じ速さでじわじわ変化する。
   閾値でのカクッとした切り替えを避けるため、is-stuck のような
   クラス判定ではなく毎フレームの数値で連続的に混ぜている。 */
body:has(.title-page){
  --paper:      color-mix(in srgb, #ececec calc((1 - var(--scroll-t)) * 100%), var(--accent-blue) calc(var(--scroll-t) * 100%));
  --paper-sunk: color-mix(in srgb, #e3e3e3 calc((1 - var(--scroll-t)) * 100%), color-mix(in srgb, var(--accent-blue) 88%, black) calc(var(--scroll-t) * 100%));
  --ink:        color-mix(in srgb, #171717 calc((1 - var(--scroll-t)) * 100%), var(--accent-blue-ink) calc(var(--scroll-t) * 100%));
  --ink-60:     color-mix(in srgb, #6d6d6b calc((1 - var(--scroll-t)) * 100%), color-mix(in srgb, var(--accent-blue-ink) 70%, transparent) calc(var(--scroll-t) * 100%));
  --ink-40:     color-mix(in srgb, #9b9b99 calc((1 - var(--scroll-t)) * 100%), color-mix(in srgb, var(--accent-blue-ink) 45%, transparent) calc(var(--scroll-t) * 100%));
  --rule:       color-mix(in srgb, #d1d1d1 calc((1 - var(--scroll-t)) * 100%), color-mix(in srgb, var(--accent-blue-ink) 25%, transparent) calc(var(--scroll-t) * 100%));
  --rule-hard:  color-mix(in srgb, #b9b9b9 calc((1 - var(--scroll-t)) * 100%), color-mix(in srgb, var(--accent-blue-ink) 45%, transparent) calc(var(--scroll-t) * 100%));
}
body:has(.title-page) .masthead{
  border-bottom-color:color-mix(in srgb, transparent calc((1 - var(--scroll-t)) * 100%), var(--accent-blue) calc(var(--scroll-t) * 100%));
}
body:has(.title-page) .nav a:hover,
body:has(.title-page) .nav a[aria-current="page"],
body:has(.title-page) .nav .current-menu-item a{ color:var(--ink); }
.masthead__mark{
  font-family:var(--display); font-size:14px; font-weight:500;
  letter-spacing:-.03em; text-transform:lowercase; white-space:nowrap;
}
.nav{ display:flex; gap:clamp(14px,2.4vw,30px); }
.nav a{
  font-family:var(--mono); font-size:11px; letter-spacing:.14em;
  text-transform:uppercase; color:var(--ink-60);
  position:relative; padding-block:2px;
  transition:color .3s var(--ease);
}
.nav a::after{
  content:""; position:absolute; left:0; right:0; bottom:0; height:1px;
  background:currentColor; transform:scaleX(0); transform-origin:right;
  transition:transform .45s var(--ease);
}
.nav a:hover, .nav a[aria-current="page"], .nav .current-menu-item a{ color:var(--ink); }
.nav a:hover::after{ transform:scaleX(1); transform-origin:left; }

/* ============================================================
   04 — TITLE PAGE (front hero)
   ============================================================ */
/* 名前はヘッダー左上のワードマークが担うので、表紙には置かない。
   空けた分の余白そのものが表紙になる。 */
.title-page{
  min-height:clamp(360px,58svh,620px);
  padding-top:clamp(96px,14vh,150px);
  padding-bottom:clamp(28px,6vh,64px);
  display:flex; flex-direction:column; justify-content:flex-end;
}

.title-page__foot{
  display:grid;
  grid-template-columns:1fr auto;
  align-items:end;
  gap:clamp(24px,5vw,60px);
  padding-top:20px;
  border-top:1px solid var(--rule);
}
.nk-anim .title-page__foot{ opacity:0; }
.nk-ready .title-page__foot{ animation:fade .9s var(--ease) .42s forwards; }
@keyframes fade{ to{ opacity:1; } }
.title-page__role{
  max-width:34rem;
  font-size:clamp(1.05rem,1.9vw,1.35rem);
  font-weight:400;
  line-height:1.95;
}
.title-page__meta{ text-align:right; display:grid; gap:4px; }

/* ============================================================
   05 — SECTIONS
   ============================================================ */
.section{ padding-block:clamp(72px,12vh,150px); }
.section__head{
  display:flex; align-items:baseline; justify-content:space-between;
  gap:20px; padding-bottom:14px; border-bottom:1px solid var(--rule-hard);
}
.section__note{ max-width:var(--measure); padding-top:26px; }

/* ============================================================
   06 — WORKS  (signature)
   4列の格子。図版の右端に年を縦に立て、下に日付・名前・種別。
   ============================================================ */
.works{
  display:grid;
  grid-template-columns:repeat(4, minmax(0,1fr));
  gap:clamp(44px,5vw,78px) clamp(20px,2.8vw,48px);
  padding-top:clamp(34px,5vw,64px);
}

.work{
  display:block;
  padding-bottom:14px;
  border-bottom:1px solid var(--rule);
  transition:border-color .5s var(--ease);
}
.work:hover{ border-bottom-color:var(--ink); }

.work__frame{
  display:grid;
  grid-template-columns:1fr auto;
  align-items:stretch;
  gap:9px;
}
.work__img{
  display:block;
  aspect-ratio:4/3;
  overflow:hidden;
  background:var(--paper-sunk);
}
.work__img img{
  width:100%; height:100%; object-fit:cover; display:block;
  transition:transform 1.3s var(--ease);
}
.work:hover .work__img img{ transform:scale(1.035); }

.work__year{
  writing-mode:vertical-rl;
  align-self:center;
  font-family:var(--mono);
  font-size:10px;
  letter-spacing:.34em;
  color:var(--ink-40);
  transition:color .4s var(--ease);
}
.work:hover .work__year{ color:var(--ink-60); }

.work__date{
  display:block;
  font-family:var(--mono);
  font-size:11px;
  letter-spacing:.08em;
  color:var(--ink-60);
  padding-top:16px;
}
.work__row{
  display:grid;
  grid-template-columns:1fr auto;
  align-items:baseline;
  gap:12px;
  padding-top:9px;
}
.work__name{
  font-family:var(--display);
  font-weight:400;
  font-size:14px;
  line-height:1.5;
  letter-spacing:.06em;
  text-transform:uppercase;
  min-width:0;
}
.work__cat{
  font-family:var(--mono);
  font-size:11px;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--ink-40);
  white-space:nowrap;
  transition:color .4s var(--ease);
}
.work:hover .work__cat{ color:var(--ink-60); }

@media (max-width:1180px){ .works{ grid-template-columns:repeat(3, minmax(0,1fr)); } }
@media (max-width:880px){  .works{ grid-template-columns:repeat(2, minmax(0,1fr)); } }
@media (max-width:520px){  .works{ grid-template-columns:1fr; } }

/* 汎用固定ページの見出し（page.php） */
.work-head__title{
  font-family:var(--display);
  font-weight:500;
  max-width:20ch;
  font-size:clamp(1.9rem,4.4vw,3.4rem);
  line-height:1.02; letter-spacing:-.035em;
}

/* ============================================================
   08 — SINGLE WORK
   ============================================================ */

/* ヒーロー全体。左上に薄い格子の地紋を敷き、右にアイキャッチをはみ出させる */
.work-hero{
  position:relative;
  overflow:hidden;
  padding-top:clamp(96px,15vh,168px);
  background:var(--paper);
}
.work-hero::before{
  content:"";
  position:absolute; inset:0;
  background-image:
    repeating-linear-gradient(45deg,  var(--rule) 0 1px, transparent 1px 56px),
    repeating-linear-gradient(-45deg, var(--rule) 0 1px, transparent 1px 56px);
  opacity:.7;
  -webkit-mask-image:linear-gradient(to bottom, #000 0, #000 260px, transparent 460px);
          mask-image:linear-gradient(to bottom, #000 0, #000 260px, transparent 460px);
  pointer-events:none;
}

.work-hero__grid{
  display:grid;
  grid-template-columns:1fr clamp(280px, 38%, 460px);
  grid-template-areas:"text image";
  gap:clamp(40px,6vw,88px);
  align-items:start;
  padding-bottom:clamp(60px,9vw,120px);
}

.work-hero__intro{
  grid-area:text;
  position:relative;
}

.work-hero__no{ letter-spacing:.18em; }

.work-hero__title{
  font-family:var(--serif);
  font-weight:500;
  font-size:clamp(1.6rem,3.2vw,2.6rem);
  line-height:1.45;
  letter-spacing:.02em;
  white-space:nowrap;
  margin-top:20px;
}

.work-hero__tags{ display:flex; flex-wrap:wrap; gap:8px; margin-top:24px; }
.pill{
  display:inline-block;
  font-family:var(--mono);
  font-size:10px; letter-spacing:.14em; text-transform:uppercase;
  color:var(--ink-60);
  border:1px solid var(--rule-hard);
  padding:6px 13px;
}

.work-hero__lead{ margin-top:28px; max-width:32rem; padding:0; }
.work-hero__lead p{ font-size:.98rem; line-height:1.95; color:var(--ink); margin:0; }

.work-hero__accent{
  font-family:var(--serif);
  font-weight:600;
  font-size:1.15rem;
  letter-spacing:.03em;
  color:var(--accent);
  margin-top:24px;
}

.work-hero__figwrap{
  grid-area:image;
  position:relative;
  margin-top:calc(65px + 2.9 * clamp(1.6rem,3.2vw,2.6rem));
}

/* 作品そのものを主役にする。切り取らず全体を見せる */
.work-hero__figure{
  margin:0;
  width:100%;
  aspect-ratio:1/1;
  display:flex; align-items:center; justify-content:center;
  overflow:hidden;
  background:#fff;
}
.work-hero__figure img{
  width:100%; height:100%;
  object-fit:contain;
  display:block;
}

.work-hero__credit{
  display:flex;
  align-items:baseline;
  justify-content:space-between;
  gap:12px;
  padding-top:18px;
  border-top:1px solid var(--rule);
  margin-top:18px;
}
.work-hero__credit-label{
  font-size:10px;
  letter-spacing:.18em;
  color:var(--ink-40);
}
.work-hero__credit-name{
  font-family:var(--serif);
  font-weight:500;
  font-size:.95rem;
  letter-spacing:.03em;
}

.work-gallery-dots{
  display:flex;
  gap:8px;
  justify-content:center;
  padding-top:16px;
}
.work-gallery-dot{
  width:8px; height:8px;
  border-radius:50%;
  border:1px solid var(--rule-hard);
  background:transparent;
  padding:0;
  cursor:pointer;
  transition:background .2s ease;
}
.work-gallery-dot.is-active{ background:var(--rule-hard); }

@media (max-width:820px){
  .work-hero__grid{
    grid-template-columns:1fr;
    grid-template-areas:"image" "text";
  }
  .work-hero__figwrap{ margin-top:0; margin-bottom:clamp(30px,6vw,48px); }
  .work-hero__figure{ aspect-ratio:4/3; }
}
.spec{
  display:grid; grid-template-columns:repeat(auto-fit,minmax(150px,1fr));
  gap:clamp(18px,3vw,40px);
  padding-block:clamp(30px,5vw,56px);
  border-bottom:1px solid var(--rule);
}
.spec__k{ display:block; margin-bottom:6px; }
.spec__v{ font-size:.95rem; line-height:1.8; }

/* 記事は画面の中央に、版面を広く取る。
   文章だけ字面幅に絞り、画像や引用は版面いっぱいまで広げられる。 */
.column{ max-width:var(--column); margin-inline:auto; width:100%; }

.prose{
  max-width:none;
  padding-block:clamp(40px,7vw,90px);
}
.prose > p,
.prose > h2,
.prose > h3,
.prose > h4,
.prose > ul,
.prose > ol,
.prose > blockquote,
.prose > .wp-block-quote,
.prose > .wp-block-list,
.prose > .wp-block-paragraph,
.prose > .wp-block-heading{
  max-width:var(--text);
  margin-inline:auto;
}
.prose > figure,
.prose > .wp-block-image,
.prose > .wp-block-gallery,
.prose > .wp-block-embed,
.prose > .wp-block-video{
  width:100%;
  margin-inline:auto;
}
.prose .alignwide,
.prose .alignfull{ width:100%; }
.prose > * + *{ margin-top:1.9em; }
.prose h2{ font-family:var(--display); font-weight:500; font-size:1.6rem; line-height:1.35; letter-spacing:-.025em; }
.prose h3{ font-size:1.05rem; font-weight:500; letter-spacing:.04em; }
.prose a{ border-bottom:1px solid var(--rule-hard); }
.prose a:hover{ border-bottom-color:var(--ink); }
.prose figure{ max-width:none; }
.prose figcaption{ font-family:var(--mono); font-size:11px; letter-spacing:.1em; color:var(--ink-60); margin-top:10px; }
.prose blockquote{
  border-left:1px solid var(--rule-hard); padding-left:1.6em;
  font-size:1.15rem; line-height:1.9;
}
.prose img{ width:100%; }

.next{
  display:block; padding-block:clamp(44px,7vw,90px);
  border-top:1px solid var(--rule-hard);
}
.next__title{
  font-family:var(--serif); font-weight:500;
  font-size:clamp(1.6rem,3.2vw,2.6rem); line-height:1.45;
  letter-spacing:.01em; margin-top:14px;
  transition:transform .6s var(--ease);
  transform-origin:left;
}
.next:hover .next__title{ transform:translateX(14px); }

/* ============================================================
   08.5 — ABOUT / CONTACT の版面
   ============================================================ */
.page-body{ padding-top:clamp(104px,15vh,168px); padding-bottom:clamp(60px,9vw,120px); }

.page-head{
  display:flex; align-items:baseline; justify-content:space-between;
  gap:20px; padding-bottom:14px;
  border-bottom:1px solid var(--rule-hard);
}

/* 大きな一文。ページの見出しを兼ねる */
.statement{
  font-family:var(--display);
  font-weight:400;
  font-size:clamp(1.5rem, 3.4vw, 2.9rem);
  line-height:1.5;
  letter-spacing:-.02em;
  max-width:24ch;
  padding-top:clamp(38px,6vw,76px);
}

.about{
  display:grid;
  grid-template-columns:1fr clamp(230px, 30%, 420px);
  gap:clamp(28px,5vw,80px);
  align-items:start;
}
.about__main{ min-width:0; }
.about--full{ grid-template-columns:1fr; }
.portrait{
  margin:0;
  align-self:start;
  position:sticky; top:clamp(80px,11vh,120px);
  background:var(--paper-sunk);
  aspect-ratio:3/4; overflow:hidden;
  margin-top:clamp(38px,6vw,76px);
}
.portrait img{ width:100%; height:100%; object-fit:cover; }

/* 台帳。ラベルと中身を罫線で積む */
.band{ padding-top:clamp(52px,8vw,104px); }
.band__label{ display:block; padding-bottom:12px; border-bottom:1px solid var(--rule-hard); }

.ledger__row{
  display:grid;
  grid-template-columns:clamp(96px,15vw,220px) 1fr;
  gap:clamp(14px,3vw,44px);
  align-items:baseline;
  padding-block:clamp(14px,1.8vw,22px);
  border-bottom:1px solid var(--rule);
}
.ledger__k{ color:var(--ink); padding-top:.35em; }
.ledger__v{ font-size:.98rem; line-height:1.95; max-width:44rem; }
.under{ border-bottom:1px solid var(--rule-hard); }
.under:hover{ border-bottom-color:var(--ink); }

/* 次のページへの送り */
.jump{
  display:block;
  margin-top:clamp(52px,8vw,104px);
  padding-top:clamp(26px,4vw,44px);
  border-top:1px solid var(--rule-hard);
}
.jump__title{
  display:block; margin-top:12px;
  font-family:var(--display); font-weight:500;
  font-size:clamp(1.5rem,4.4vw,3.2rem);
  line-height:1.08; letter-spacing:-.035em;
  transform-origin:left;
  transition:transform .6s var(--ease);
}
.jump:hover .jump__title{ transform:translateX(12px); }

.mailto{ padding-top:clamp(38px,6vw,72px); }
.prose--flush{ max-width:none; padding-block:clamp(28px,4vw,48px) 0; }
.prose--flush > p,
.prose--flush > h2,
.prose--flush > h3,
.prose--flush > ul,
.prose--flush > ol,
.prose--flush > blockquote{ margin-inline:0; max-width:40rem; }

@media (max-width:820px){
  .about{ grid-template-columns:1fr; }
  .portrait{ position:static; order:-1; margin-top:clamp(30px,6vw,48px); aspect-ratio:4/3; }
  .ledger__row{ grid-template-columns:1fr; row-gap:6px; }
  .ledger__k{ padding-top:0; }
}

/* ============================================================
   09 — ABOUT / CONTACT
   ============================================================ */
.split{
  display:grid; grid-template-columns:var(--rail) 1fr;
  gap:clamp(16px,3vw,40px);
  padding-top:clamp(30px,5vw,56px);
}
.split + .split{ margin-top:clamp(28px,4vw,48px); padding-top:clamp(28px,4vw,48px); border-top:1px solid var(--rule); }
.contact-mail{
  font-family:var(--display);
  font-weight:500;
  font-size:clamp(1.35rem,4.2vw,3.1rem);
  line-height:1.15; letter-spacing:-.035em;
  display:inline-block; position:relative;
}
.contact-mail::after{
  content:""; position:absolute; left:0; right:0; bottom:.08em; height:1px;
  background:var(--ink); transform:scaleX(0); transform-origin:right;
  transition:transform .6s var(--ease);
}
.contact-mail:hover::after{ transform:scaleX(1); transform-origin:left; }
.socials{ display:flex; flex-wrap:wrap; gap:22px; padding-top:24px; }

/* ============================================================
   10 — FOOTER
   ============================================================ */
.colophon{
  display:flex; flex-wrap:wrap; align-items:baseline; justify-content:space-between;
  gap:14px;
  padding:22px var(--pad) 14px;
  border-top:1px solid var(--rule-hard);
}

/* --- 足元のマーキー：右から左へ、紙の地に沈む大きさで --- */
.marquee{
  overflow:hidden;
  margin-top:clamp(10px,1.6vw,22px);
}
.marquee__track{
  display:flex; width:max-content;
  animation:nakano-slide 80s linear infinite;
  will-change:transform;
}
.marquee__group{ display:flex; }
.marquee__group span{
  display:block;
  font-family:var(--display);
  font-weight:600;
  font-size:clamp(3rem, 11.5vw, 13rem);
  line-height:1;
  letter-spacing:-.045em;
  white-space:nowrap;
  padding-right:.22em;
  color:rgba(23,23,23,.13);
  /* 文字高に対する比で断つ。em 基準なのでどの画面幅でも同じ切れ方になる */
  height:.84em;
}

@keyframes nakano-slide{
  from{ transform:translate3d(0,0,0); }
  to  { transform:translate3d(-50%,0,0); }
}

/* ============================================================
   11 — EMPTY STATE
   ============================================================ */
.empty{
  padding-block:clamp(50px,9vw,110px);
  max-width:var(--measure);
}
.empty__title{ font-family:var(--display); font-weight:500; font-size:1.5rem; letter-spacing:-.025em; line-height:1.4; margin-bottom:12px; }

/* ============================================================
   11.5 — PAGE ENTER / LEAVE
   JS が付与する .nk-anim / .nk-ready で制御する。
   JS が動かない環境では最初から見えている（隠れっぱなしを防ぐ）。
   ============================================================ */
.nk-anim #main,
.nk-anim .masthead,
.nk-anim .colophon,
.nk-anim .marquee{ opacity:0; }

.nk-ready #main{ animation:nakano-enter .82s var(--ease) forwards; }
.nk-ready .masthead{ animation:nakano-fade .8s var(--ease) .1s forwards; }
.nk-ready .colophon{ animation:nakano-fade .8s var(--ease) .22s forwards; }
.nk-ready .marquee{ animation:nakano-fade 1.1s var(--ease) .34s forwards; }

@keyframes nakano-enter{
  from{ opacity:0; transform:translate3d(0,12px,0); }
  to  { opacity:1; transform:none; }
}
@keyframes nakano-fade{
  from{ opacity:0; }
  to  { opacity:1; }
}

/* 内部リンクを踏んだとき、次のページへ渡す前に一度沈む */
.nk-leaving #main,
.nk-leaving .colophon,
.nk-leaving .marquee{
  opacity:0;
  transition:opacity .26s var(--ease);
}

/* --- 先頭へ戻る --- */
.to-top{
  position:fixed; z-index:70;
  right:var(--pad); bottom:clamp(16px,2.2vw,28px);
  display:inline-flex; align-items:center; gap:9px;
  padding:9px 15px;
  background:var(--paper);
  border:1px solid var(--rule-hard);
  opacity:0; transform:translateY(8px); pointer-events:none;
  transition:opacity .5s var(--ease), transform .5s var(--ease),
             background .35s var(--ease), border-color .35s var(--ease), color .35s var(--ease);
}
.to-top.is-on{ opacity:1; transform:none; pointer-events:auto; }
.to-top:hover{ background:var(--ink); border-color:var(--ink); color:var(--paper); }
.to-top:hover .mono{ color:inherit; }
.to-top__arrow{ font-size:12px; line-height:1; }

/* ============================================================
   12 — REVEAL
   ============================================================ */
.reveal{ opacity:0; transform:translateY(14px); }
.reveal.is-in{
  opacity:1; transform:none;
  transition:opacity var(--slow) var(--ease), transform var(--slow) var(--ease);
  transition-delay:var(--d,0ms);
}

/* ============================================================
   13 — RESPONSIVE
   ============================================================ */
@media (max-width:720px){
  :root{ --rail:56px; }
  .title-page__foot{ grid-template-columns:1fr; align-items:start; }
  .title-page__meta{ text-align:left; }
  .work__name{ font-size:13px; }
  .split{ grid-template-columns:1fr; }
  .nav{ gap:14px; }
}

@media (prefers-reduced-motion:reduce){
  html{ scroll-behavior:auto; }
  *,*::before,*::after{
    animation-duration:.001ms !important; animation-delay:0ms !important;
    transition-duration:.001ms !important;
  }
  .marquee__track{ animation:none !important; }
  .nk-anim #main,.nk-anim .masthead,.nk-anim .colophon,.nk-anim .marquee,
  .nk-anim .title-page__foot,.nk-leaving #main,.nk-leaving .colophon,.nk-leaving .marquee{
    opacity:1 !important; transform:none !important;
  }
  .title-page__foot{ opacity:1; }
  .reveal{ opacity:1; transform:none; }
}

@media print{
  .masthead,.marquee,.to-top{ display:none; }
  body{ background:#fff; }
}