/* ==========================================================================
   YORU — chrome: header · loader · grain · cursor · terminal background ·
   transitions · flyers · toast
   ========================================================================== */

/* ---------- header ---------- */
.header {
  position: fixed; inset: 0 0 auto 0; z-index: var(--z-header);
  height: var(--nav-h); padding: 0 var(--gutter); padding-top: env(safe-area-inset-top);
  display: flex; align-items: center; justify-content: space-between; gap: 24px;
  border-bottom: 1px solid transparent;
  transition: background-color .5s var(--ease-out), border-color .5s var(--ease-out), backdrop-filter .5s;
}
.header.is-scrolled {
  background: rgba(8, 8, 8, .78);
  -webkit-backdrop-filter: blur(6px); backdrop-filter: blur(6px);
  border-bottom-color: var(--line);
}
.header__logo { display: flex; align-items: baseline; gap: 7px; font-weight: 800; font-size: 13px; letter-spacing: .22em; white-space: nowrap; }
.header__kanji { font-family: var(--f-serif); font-weight: 700; font-size: 17px; letter-spacing: 0; }
.header__slash { color: var(--red); font-weight: 400; }
.header__nav { display: flex; gap: clamp(14px, 2.4vw, 38px); }
.header__nav a, .header__nav button { position: relative; padding: 6px 0; color: var(--ivory-60); transition: color .3s; }
.header__nav a::after, .header__nav button::after {
  content: ""; position: absolute; left: 0; right: 100%; bottom: 1px; height: 1px; background: var(--red);
  transition: right .45s var(--ease-out);
}
.header__nav a:hover, .header__nav button:hover, .header__nav .is-active { color: var(--ivory); }
.header__nav a:hover::after, .header__nav button:hover::after, .header__nav .is-active::after { right: 0; }
.header__random { color: var(--red) !important; }
.header.is-light { color: var(--ink); }
.header.is-light .header__nav a, .header.is-light .header__nav button, .header.is-light .header__clock { color: rgba(21, 18, 20, .62); }
.header.is-light .header__nav .is-active, .header.is-light .header__clock b { color: var(--ink); }
.header.is-light .icon-btn svg { stroke: var(--ink); }
.header.is-light.is-scrolled { background: rgba(230, 223, 208, .82); border-bottom-color: rgba(21, 18, 20, .14); }
.header__tools { display: flex; align-items: center; gap: 12px; }
.header__clock { font-size: 10px; color: var(--grey); white-space: nowrap; }
.header__clock b { color: var(--ivory-60); font-weight: 400; }
.icon-btn { width: 34px; height: 34px; display: grid; place-items: center; }
.icon-btn svg { width: 18px; height: 18px; fill: none; stroke: var(--ivory); stroke-width: 1.3; transition: stroke .3s; }
.icon-btn:hover svg { stroke: var(--red); }

/* ---------- loader ---------- */
.loader { position: fixed; inset: 0; z-index: var(--z-loader); display: grid; place-items: center; pointer-events: none; }
.no-js .loader { display: none; }
.loader__panel { position: absolute; left: 0; right: 0; height: 50.5%; background: var(--bg-0); transition: transform .5s var(--ease-io); }
.loader__panel--top { top: 0; }
.loader__panel--bottom { bottom: 0; }
.loader__line {
  position: absolute; left: 0; right: 0; top: 50%; height: 1px; background: var(--ivory);
  box-shadow: 0 0 14px rgba(234, 229, 218, .6); transform: scaleX(0); opacity: 0;
}
.loader__term { position: absolute; left: var(--gutter); top: 50%; transform: translateY(-50%); color: var(--ivory-60); font-size: 11px; }
.loader__term p:first-child { font-family: var(--f-serif); font-size: 22px; color: var(--ivory); margin-bottom: 10px; letter-spacing: 0; }
.loader__mark {
  position: relative; font-weight: 900; font-stretch: 125%; font-size: clamp(42px, 7vw, 96px); letter-spacing: -.03em;
  opacity: 0; transform: translateY(8px); transition: opacity .35s var(--ease-out), transform .5s var(--ease-out);
}
.loader__mark.is-on { opacity: 1; transform: none; }
.loader.is-reveal .loader__term, .loader.is-reveal .loader__mark { opacity: 0; transition: opacity .18s; }
.loader.is-reveal .loader__line { animation: loader-line .56s var(--ease-io) forwards; }
.loader.is-reveal .loader__panel--top { transform: translateY(-100%); transition-delay: .1s; }
.loader.is-reveal .loader__panel--bottom { transform: translateY(100%); transition-delay: .1s; }
@keyframes loader-line { 0% { transform: scaleX(0); opacity: 1; } 35% { transform: scaleX(1); opacity: 1; } 100% { transform: scaleX(1); opacity: 0; } }
/* failsafe: never leave the loader up if a script fails */
.loader { animation: loader-failsafe 0s linear 6s forwards; }
@keyframes loader-failsafe { to { visibility: hidden; } }

/* ---------- film grain ---------- */
.grain {
  position: fixed; inset: -60px; z-index: var(--z-grain); pointer-events: none;
  opacity: .055; background-size: 240px 240px; mix-blend-mode: normal;
  animation: grain .9s steps(6) infinite;
}
@keyframes grain {
  0% { transform: translate(0, 0); } 17% { transform: translate(-22px, 14px); } 33% { transform: translate(18px, -26px); }
  50% { transform: translate(-12px, 30px); } 67% { transform: translate(28px, 8px); } 83% { transform: translate(-30px, -16px); } 100% { transform: translate(0, 0); }
}

/* ---------- cursor ---------- */
.cursor { position: fixed; left: 0; top: 0; z-index: var(--z-cursor); pointer-events: none; width: 0; height: 0; opacity: 0; transition: opacity .25s; display: none; }
.has-pointer .cursor { display: block; }
.has-pointer, .has-pointer a, .has-pointer button, .has-pointer [data-cursor] { cursor: none; }
.has-pointer input, .has-pointer textarea { cursor: text; }
.cursor.is-visible { opacity: 1; }
.cursor__ring {
  position: absolute; left: -7px; top: -7px; width: 14px; height: 14px; border-radius: 50%;
  border: 1px solid var(--ivory); transition: transform .45s var(--ease-out), border-color .3s, background-color .3s;
}
.cursor__label {
  position: absolute; left: 0; top: 0; transform: translate(-50%, -50%); font-family: var(--f-mono); font-size: 9px; letter-spacing: .22em;
  color: var(--ivory); opacity: 0; transition: opacity .2s; white-space: nowrap; padding-left: .22em;
}
.cursor[data-state="link"] .cursor__ring { transform: scale(2.1); border-color: var(--ivory-60); }
.cursor[data-state="text"] .cursor__ring { transform: scale(.4); background: var(--red); border-color: var(--red); }
.cursor[data-state="label"] .cursor__ring, .cursor[data-state="down"] .cursor__ring { transform: scale(5.2); border-color: var(--ivory-80); background: rgba(8, 8, 8, .18); }
.cursor[data-state="down"] .cursor__ring { border-color: var(--red); background: rgba(210, 33, 46, .12); }
.cursor[data-state="label"] .cursor__label, .cursor[data-state="down"] .cursor__label { opacity: 1; }
.cursor.is-press .cursor__ring { transform: scale(.8); }
.cursor.is-press[data-state="label"] .cursor__ring, .cursor.is-press[data-state="down"] .cursor__ring { transform: scale(4.6); }

/* ---------- terminal background ---------- */
.terminal-bg { position: absolute; inset: 0; overflow: hidden; pointer-events: none; z-index: 0; --t-o: .045; }
.tline {
  position: absolute; white-space: nowrap; user-select: none;
  font-family: var(--f-mono); font-weight: 700; letter-spacing: -.04em; line-height: .92;
  font-size: clamp(76px, 13vw, 230px); color: var(--ivory); opacity: var(--t-o);
  transition: transform .5s var(--ease-out);
}
.tline.is-cjk { font-family: var(--f-serif); font-weight: 800; letter-spacing: .02em; font-size: clamp(96px, 17vw, 300px); }
.tline.is-red { color: var(--red); opacity: calc(var(--t-o) * 1.3); }
.tline.is-ghost { animation: tghost 3.2s linear forwards; }
@keyframes tghost { to { opacity: 0; } }
.tline__cursor { display: inline-block; width: .5em; height: .09em; margin-left: .05em; background: currentColor; vertical-align: baseline; animation: blink 1.05s steps(1) infinite; }

/* ---------- transitions ---------- */
.tov { position: fixed; inset: 0; z-index: var(--z-transition); pointer-events: none; visibility: hidden; }
.tov.is-active { visibility: visible; pointer-events: all; }
.tov__panel { position: absolute; left: 0; right: 0; height: 50.2%; background: var(--bg-viewer); }
.tov__panel--top { top: 0; transform: translateY(-100%); }
.tov__panel--bottom { bottom: 0; transform: translateY(100%); }
.tov__slit { position: absolute; left: 0; right: 0; top: 50%; height: 1px; background: var(--red); box-shadow: 0 0 16px rgba(210, 33, 46, .8); transform: scaleX(0); }
.tov__curtain { position: absolute; inset: 0; background: var(--bg-viewer); transform: scaleY(0); }
.tov__scan { position: absolute; left: 0; right: 0; top: -1px; height: 1px; background: var(--red); box-shadow: 0 0 18px 2px rgba(210, 33, 46, .75); opacity: 0; }
.tov__blade {
  position: absolute; left: 0; top: 50%; width: 100%; height: 2px; margin-top: -1px; opacity: 0;
  background: linear-gradient(90deg, transparent, rgba(220, 224, 232, .25) 40%, #fff 92%, transparent);
  box-shadow: 0 0 22px rgba(255, 255, 255, .55);
  z-index: 3;
}
.tov__halves { position: absolute; inset: 0; opacity: 0; background: rgba(5, 5, 5, 1); }
.tov__halves:empty { display: none; }
.tov__snap { position: absolute; inset: 0; overflow: hidden; background: var(--bg-0); }
.tov__snap.is-top { clip-path: inset(0 0 50% 0); }
.tov__snap.is-bottom { clip-path: inset(50% 0 0 0); }
.tov__label { position: absolute; left: var(--gutter); bottom: 9vh; color: var(--ivory-80); font-size: 12px; z-index: 4; }

/* ---------- stack burst flyers ---------- */
.flyers { position: fixed; inset: 0; z-index: var(--z-flyers); pointer-events: none; }
.flyers__back { position: absolute; inset: 0; background: var(--bg-0); opacity: 0; }
.flyer { position: absolute; left: 0; top: 0; will-change: transform; box-shadow: 0 30px 80px rgba(0, 0, 0, .55); background: var(--bg-2); }
.flyer img { width: 100%; height: 100%; object-fit: cover; }

/* ---------- toast ---------- */
.toast {
  position: fixed; left: 50%; bottom: calc(22px + env(safe-area-inset-bottom)); z-index: var(--z-toast);
  transform: translate(-50%, 16px); opacity: 0; pointer-events: none;
  padding: 10px 16px; border: 1px solid var(--line-2); background: rgba(13, 13, 13, .94); color: var(--ivory);
  font-size: 10px; letter-spacing: .2em; white-space: nowrap; max-width: calc(100vw - 32px); overflow: hidden; text-overflow: ellipsis;
  transition: opacity .35s var(--ease-out), transform .45s var(--ease-out);
}
.toast.is-on { opacity: 1; transform: translate(-50%, 0); }

/* ---------- ambience ---------- */
.audio-btn { color: var(--grey); transition: color .3s; }
.audio-btn:hover, .audio-btn[aria-pressed="true"] { color: var(--ivory); }
.audio-btn[aria-pressed="true"] { color: var(--amber); }

@media (max-width: 1100px) {
  .header__clock { display: none; }
}
@media (max-width: 860px) {
  .header__nav a[data-nav="desktop"], .header__nav a[data-nav="mobile"] { display: none; }
}
@media (max-width: 620px) {
  .header__nav { gap: 14px; }
  .header__nav button[data-menu] { display: none; }
  .header__nav a[data-nav="archive"] { display: none; }
}

/* reduced motion: no grain movement, no cursor lag (handled in JS), quick fades */
.is-reduced .grain { animation: none; }
@media (prefers-reduced-motion: reduce) {
  .grain { animation: none; }
}