/* src/styles/base.css — reset, page, type scale, app shell layout, utilities.
   Components live in components.css; per-view styles in styles/views/<view>.css. */

/* ── Reset ───────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }
html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  font-synthesis: none;              /* never fake bold/italic Japanese */
  -webkit-tap-highlight-color: transparent;
  background-color: var(--bg);
  scroll-padding-top: calc(var(--header-h) + var(--safe-top) + var(--s-3));
  scroll-padding-bottom: calc(var(--tabbar-total) + var(--s-3));
}
@media (prefers-reduced-motion: no-preference) { html { scroll-behavior: smooth; } }
html.has-layer { overflow: hidden; }

body {
  margin: 0;
  min-height: 100dvh;
  /* No body background: html paints the washi colour so the grain (z-index −1) sits between the two. */
  color: var(--text);
  font: 400 var(--fs-body)/var(--lh-body) var(--font-sans);
  font-variant-numeric: lining-nums;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
/* Washi grain: behind all content, on the page only — cards are clean sheets. */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image: var(--motif-grain);
  background-size: 128px 128px;
  opacity: var(--grain-opacity);
  mix-blend-mode: multiply;
}

h1, h2, h3, h4, h5, h6, p, ul, ol, dl, dd, figure, blockquote { margin: 0; }
h1, h2, h3, h4, h5, h6 { font-weight: 500; font-size: inherit; line-height: inherit; }
ul[role="list"], ol[role="list"] { list-style: none; padding: 0; }
a { color: inherit; text-decoration: none; }
img, svg, video { max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; letter-spacing: inherit; }
button { background: none; border: 0; padding: 0; margin: 0; cursor: pointer; text-align: inherit; }
button:disabled, [aria-disabled="true"] { cursor: default; }
input, textarea, select { font-size: max(16px, 1em); } /* ≥16px: no iOS zoom */
[hidden] { display: none !important; }
strong, b { font-weight: 600; }
sup { font-size: .62em; line-height: 0; vertical-align: .6em; }
::selection { background: var(--surface-pressed); color: var(--text); }

:focus { outline: none; }
:focus-visible { outline: 2px solid var(--text); outline-offset: 2px; border-radius: var(--r-1); }

/* Japanese runs: gothic, strict line breaking, never letter-spaced. */
:lang(ja) { font-family: var(--font-jp); line-break: strict; letter-spacing: 0; font-style: normal; }
.ja-mincho:lang(ja), .t-mincho { font-family: var(--font-mincho); }

.icon { display: inline-block; flex-shrink: 0; vertical-align: middle; fill: none; stroke: currentColor; stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round; overflow: visible; }

/* ── Responsive gutters ──────────────────────────────────────── */
@media (min-width: 400px) { :root { --gutter: 20px; } }
@media (min-width: 600px) and (max-width: 1023px) { :root { --content-max: 640px; } }
@media (min-width: 1024px) { :root { --gutter: 32px; --fs-hero: 120px; --lh-hero: 108px; } }

/* ── Type scale (utility classes) ────────────────────────────── */
.t-hero    { font: 400 var(--fs-hero)/var(--lh-hero) var(--font-serif); letter-spacing: -.02em; font-variant-numeric: lining-nums tabular-nums; }
.t-display { font: 500 var(--fs-display)/var(--lh-display) var(--font-serif); letter-spacing: -.01em; }
.t-title-1 { font: 500 var(--fs-title-1)/var(--lh-title-1) var(--font-serif); letter-spacing: -.005em; }
.t-chapter { font: 500 var(--fs-chapter)/var(--lh-chapter) var(--font-serif); letter-spacing: -.005em; }
.t-title-2 { font: 500 var(--fs-title-2)/var(--lh-title-2) var(--font-serif); }
.t-title-3 { font: 500 var(--fs-title-3)/var(--lh-title-3) var(--font-serif); }
.t-aside   { font: italic 400 var(--fs-aside)/var(--lh-aside) var(--font-serif); color: var(--text-2); }
.t-body    { font: 400 var(--fs-body)/var(--lh-body) var(--font-sans); }
.t-stop    { font: 500 var(--fs-body)/22px var(--font-sans); }
.t-small   { font: 400 var(--fs-small)/var(--lh-small) var(--font-sans); color: var(--text-2); }
.t-caption { font: 400 var(--fs-caption)/var(--lh-caption) var(--font-sans); color: var(--text-3); }
.t-label, .eyebrow { font: 600 var(--fs-label)/var(--lh-label) var(--font-sans); letter-spacing: var(--track-label); text-transform: uppercase; color: var(--text-3); }
.t-micro   { font: 500 var(--fs-micro)/var(--lh-micro) var(--font-sans); }
.t-time    { font: 600 var(--fs-time)/var(--lh-time) var(--font-sans); font-variant-numeric: tabular-nums lining-nums; }
.t-time-lg { font: 600 var(--fs-time-lg)/var(--lh-time-lg) var(--font-sans); font-variant-numeric: tabular-nums lining-nums; }
.t-code    { font: 600 var(--fs-code)/var(--lh-code) var(--font-sans); letter-spacing: .02em; }
.t-stat    { font: 600 var(--fs-stat)/var(--lh-stat) var(--font-sans); font-variant-numeric: tabular-nums lining-nums; }
.t-jp      { font: 400 var(--fs-jp-body)/var(--lh-jp-body) var(--font-jp); }
.t-jp-large { font: 400 var(--fs-jp-large)/var(--lh-jp-large) var(--font-jp); }
.t-serif   { font-family: var(--font-serif); }
.t-italic  { font-style: italic; }
.tnum      { font-variant-numeric: tabular-nums lining-nums; }

.c-text   { color: var(--text); }
.c-2      { color: var(--text-2); }
.c-3      { color: var(--text-3); }
.c-accent { color: var(--accent-text); }   /* "you are here" text only */
.c-tone   { color: var(--tone-ink); }

/* Tategaki (vertical) labels: Shippori-style mincho, upright. Max one per mobile viewport. */
.tategaki {
  writing-mode: vertical-rl;
  text-orientation: upright;
  font: 600 14px/1 var(--font-mincho);
  letter-spacing: .25em;
  font-feature-settings: normal;
}

.sr-only {
  position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); clip-path: inset(50%); white-space: nowrap; border: 0;
}
.clamp-2 { display: -webkit-box; -webkit-box-orient: vertical; -webkit-line-clamp: 2; line-clamp: 2; overflow: hidden; }
.clamp-1 { overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }

/* ── Layout primitives ───────────────────────────────────────── */
.page {
  width: 100%;
  max-width: calc(var(--content-max) + 2 * var(--gutter));
  margin-inline: auto;
  padding-inline: calc(var(--gutter) + var(--safe-left)) calc(var(--gutter) + var(--safe-right));
}
.stack   { display: flex; flex-direction: column; gap: var(--gap, var(--s-3)); }
.stack-1 { --gap: var(--s-1); } .stack-2 { --gap: var(--s-2); } .stack-4 { --gap: var(--s-4); }
.stack-6 { --gap: var(--s-6); } .stack-8 { --gap: var(--s-8); }
.row     { display: flex; align-items: center; gap: var(--gap, var(--s-2)); min-width: 0; }
.cluster { display: flex; flex-wrap: wrap; align-items: center; gap: var(--gap, var(--s-2)); }
.spacer  { flex: 1 1 auto; }
.section { margin-top: var(--section-gap); }
.grid-2  { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--gap, var(--s-3)); }
.hairline { height: 1px; background: var(--line); border: 0; margin: 0; }
.full-bleed { margin-inline: calc(-1 * (var(--gutter) + var(--safe-left))) calc(-1 * (var(--gutter) + var(--safe-right))); }
@media (min-width: 1024px) { .full-bleed { margin-inline: 0; } }

/* Horizontal chip scroller — scrolls inside itself, never the page. */
.chip-row {
  display: flex; gap: var(--s-2); overflow-x: auto; overscroll-behavior-x: contain;
  scrollbar-width: none; padding-block: 2px; scroll-padding-inline: var(--gutter);
}
.chip-row::-webkit-scrollbar { display: none; }
.chip-row.full-bleed { padding-inline: calc(var(--gutter) + var(--safe-left)); }
@media (min-width: 1024px) { .chip-row { flex-wrap: wrap; overflow: visible; } .chip-row.full-bleed { padding-inline: 0; } }

/* ── App shell ───────────────────────────────────────────────── */
.app { min-height: 100dvh; }

.appbar {
  position: sticky; top: 0; z-index: var(--z-header);
  height: calc(var(--header-h) + var(--safe-top));
  padding: var(--safe-top) calc(var(--gutter) + var(--safe-right)) 0 calc(var(--gutter) + var(--safe-left));
  display: flex; align-items: center; gap: var(--s-2);
  background: var(--bg);
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur-2) var(--ease-out);
}
.appbar.is-scrolled { border-bottom-color: var(--line); }
.appbar-title {
  flex: 1 1 auto; min-width: 0;
  font: 500 20px/24px var(--font-serif);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  opacity: 0; transform: translateY(6px);
  transition: opacity var(--dur-2) var(--ease-out), transform var(--dur-2) var(--ease-out);
}
.appbar.is-condensed .appbar-title { opacity: 1; transform: none; }
.appbar-status, .appbar-actions { display: flex; align-items: center; gap: var(--s-1); flex-shrink: 0; }
.appbar-actions:empty, .appbar-status:empty { display: none; }

.sim-pill, .sim-note {
  display: inline-flex; align-items: center; gap: 4px;
  height: 24px; padding: 0 8px; border-radius: var(--r-pill);
  border: 1px dashed var(--line-strong); color: var(--text-3);
  font: 500 var(--fs-micro)/1 var(--font-sans); font-variant-numeric: tabular-nums; white-space: nowrap;
}

.view-host { display: block; padding-bottom: calc(var(--tabbar-total) + var(--s-9)); outline: none; }

/* Mobile tab bar: solid surface, hairline, no blur. */
.tabbar {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: var(--z-tabbar);
  height: var(--tabbar-total);
  padding: 0 var(--safe-right) var(--safe-bottom) var(--safe-left);
  display: grid; grid-template-columns: repeat(5, minmax(0, 1fr));
  background: var(--surface);
  border-top: 1px solid var(--line);
}
.tab {
  position: relative;
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 3px;
  min-height: var(--tabbar-h); min-width: var(--tap-min);
  color: var(--text-3);
  font: 500 var(--fs-micro)/var(--lh-micro) var(--font-sans); letter-spacing: .01em;
  transition: color var(--dur-1) var(--ease-out);
}
.tab .icon { transition: transform var(--dur-1) var(--ease-out); }
.tab:active .icon { transform: scale(.94); }
.tab[aria-current="page"] { color: var(--text); font-weight: 600; }
.tab-dot {
  position: absolute; top: 5px; left: 50%; width: 5px; height: 5px; margin-left: -2.5px;
  border-radius: 50%; background: var(--accent); opacity: 0; transform: scale(.4);
  transition: opacity var(--dur-2) var(--ease-out), transform var(--dur-2) var(--ease-out);
}
.tab[aria-current="page"] .tab-dot { opacity: 1; transform: none; }
.tab:focus-visible { outline-offset: -4px; border-radius: var(--r-2); }

/* Desktop side nav. */
.sidenav { display: none; }

@media (min-width: 1024px) {
  .app { display: grid; grid-template-columns: var(--sidenav-w) minmax(0, 1fr); grid-template-rows: auto 1fr; }
  .tabbar { display: none; }
  .appbar { grid-column: 2; grid-row: 1; padding-inline: var(--s-8); }
  .view-host { grid-column: 2; grid-row: 2; padding-bottom: var(--s-10); }
  .page { max-width: calc(var(--content-max) + 2 * var(--s-8)); padding-inline: var(--s-8); margin-inline: 0; }

  .sidenav {
    grid-column: 1; grid-row: 1 / span 2;
    position: sticky; top: 0; height: 100dvh;
    display: flex; flex-direction: column;
    padding: calc(var(--s-6) + var(--safe-top)) var(--s-3) var(--s-5) calc(var(--s-3) + var(--safe-left));
    border-right: 1px solid var(--line);
    background: var(--bg);
  }
  .wordmark {
    display: flex; align-items: flex-start; gap: var(--s-2);
    padding: 0 var(--s-3); margin-bottom: var(--s-7); width: max-content;
  }
  .wordmark-text { font: italic 400 22px/1 var(--font-serif); letter-spacing: .01em; }
  .wordmark-kanji { font-size: 14px; color: var(--text-3); padding-top: 2px; }
  .sidenav-list { display: flex; flex-direction: column; gap: 2px; list-style: none; margin: 0; padding: 0; }
  .sidenav-item {
    position: relative;
    display: grid; grid-template-columns: 20px minmax(0, 1fr) auto; align-items: center; column-gap: var(--s-3);
    min-height: var(--tap-min); padding: 0 var(--s-3) 0 var(--s-4);
    border-radius: var(--r-2);
    color: var(--text-2);
    font: 500 15px/20px var(--font-sans);
    transition: background-color var(--dur-1) var(--ease-out), color var(--dur-1) var(--ease-out);
  }
  .sidenav-item:hover { background: var(--surface-pressed); color: var(--text); }
  .sidenav-item[aria-current="page"] { color: var(--text); font-weight: 600; }
  .sidenav-dot {
    position: absolute; left: 5px; top: 50%; width: 5px; height: 5px; margin-top: -2.5px;
    border-radius: 50%; background: var(--accent); opacity: 0;
  }
  .sidenav-item[aria-current="page"] .sidenav-dot { opacity: 1; }
  .sidenav-kanji { font: 400 13px/1 var(--font-mincho); color: var(--text-3); letter-spacing: .04em; }
  .sidenav-foot { margin-top: auto; display: flex; flex-direction: column; align-items: flex-start; gap: var(--s-2); padding: 0 var(--s-3); }
  .sidenav-theme {
    display: inline-flex; align-items: center; gap: var(--s-2); min-height: var(--tap-min);
    color: var(--text-3); font: 500 var(--fs-caption)/1 var(--font-sans);
  }
  .sidenav-theme:hover { color: var(--text); }
  .appbar-status { display: none; }
}

/* ── Page head (large title → collapses into the app bar) ────── */
.page-head {
  position: relative;
  display: flex; align-items: flex-end; gap: var(--s-4);
  padding-top: var(--s-1);
  margin-bottom: var(--s-6);
}
.page-head-text { flex: 1 1 auto; min-width: 0; }
.page-eyebrow { font: 600 var(--fs-label)/var(--lh-label) var(--font-sans); letter-spacing: var(--track-section); text-transform: uppercase; color: var(--text-3); margin-bottom: var(--s-2); }
.page-title { font: 500 var(--fs-display)/var(--lh-display) var(--font-serif); letter-spacing: -.01em; }
.page-lede { margin-top: var(--s-2); font: italic 400 17px/24px var(--font-serif); color: var(--text-2); max-width: 36ch; }
.page-head-action { flex-shrink: 0; }
.page-kanji { display: none; }
@media (min-width: 1024px) {
  .page-head { padding-top: var(--s-6); margin-bottom: var(--s-8); }
  .page-kanji {
    display: block; position: absolute; left: calc(-1 * var(--s-7)); top: var(--s-6);
    font-size: 15px; color: var(--text-3);
  }
}

/* ── Motion: first reveal (once per session), view transitions ─ */
@media (prefers-reduced-motion: no-preference) {
  .first-reveal [data-reveal] { animation: rise var(--dur-3) var(--ease-out) both; animation-delay: calc(min(var(--i, 0), 5) * 40ms); }
  @keyframes rise { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }
  ::view-transition-old(root) { animation: vt-out var(--dur-1) var(--ease-out) both; }
  ::view-transition-new(root) { animation: vt-in var(--dur-2) var(--ease-out) both; }
  @keyframes vt-out { to { opacity: 0; } }
  @keyframes vt-in { from { opacity: 0; } }
}
@media (prefers-reduced-motion: reduce) {
  ::view-transition-group(*), ::view-transition-old(*), ::view-transition-new(*) { animation-duration: .12s !important; }
}