/* ==========================================================================
   omaera.live — a fan-made tribute to Otonose Kanade (音乃瀬奏)
   All styling lives here (the page's Content-Security-Policy forbids inline
   style attributes). All behaviour lives in script.js.
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Palette custom properties
   Verified hues (see the fact block in index.html):
     member colour  #FFE7B5  — hololive.wiki Template:Otonose_Kanade
                               /background-color1, corroborated by sampling
                               her official channel avatar
     warm brown     #C08050  — sampled from the official channel avatar
     cream          #F0F0E0  — sampled from the official channel avatar
     gold cream     #F0E0B0  — sampled from the official channel avatar
     soft pink      #F0C0B0  — sampled from the official channel avatar
   The ink tones below are darker lightness steps of the sampled warm-brown
   hue (H ~26deg); they are not separate colours, only lightness variants.
   -------------------------------------------------------------------------- */
:root {
  --member:      #FFE7B5;               /* member colour */
  --member-wash: #FFF1D2;               /* member hue, higher lightness */
  --brown:       #C08050;               /* sampled warm brown */
  --brown-deep:  #9A5F38;               /* warm-brown hue, lower lightness (links) */
  --cream:       #F0F0E0;               /* sampled cream */
  --gold:        #F0E0B0;               /* sampled gold cream */
  --pink:        #F0C0B0;               /* sampled soft pink */

  --paper:       #FFF8EA;               /* page: member hue, near-white lightness */
  --surface:     #FFFDF8;               /* cards: warmer white */
  --ink:         #43301F;               /* text: warm-brown hue, very low lightness */
  --ink-soft:    #6E5A46;               /* muted text: warm-brown hue, mid lightness */
  /* Pinned ink for text/icons sitting ON member/gold surfaces. Those surfaces
     stay light in BOTH schemes (they are her colours), so this must never flip
     to a light value in dark mode — same warm-brown hue, minimum lightness. */
  --on-member-ink: #43301F;
  --line:        rgba(154, 95, 56, 0.22);/* hairlines from warm-brown hue */

  --key-white:   #FFFDF8;
  --key-black:   #43301F;
  --key-line:    rgba(67, 48, 31, 0.35);
  --felt:        #F0C0B0;               /* piano felt: soft pink */

  --ring:        #9A5F38;               /* focus ring */
  --shadow:      24px 24px 60px -30px rgba(67, 48, 31, 0.45);

  --maxw: 66rem;
  --pad:  clamp(1.1rem, 4vw, 2.75rem);

  /* Distinctive, self-hosted system stacks — no webfonts, JP fallbacks layered */
  --font-sans:  system-ui, -apple-system, "Segoe UI", "Hiragino Sans",
                "Yu Gothic UI", "Noto Sans JP", sans-serif;
  --font-serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia,
                "Times New Roman", "Hiragino Mincho ProN", "Yu Mincho",
                "Noto Serif JP", serif;
}

/* --------------------------------------------------------------------------
   2. Reset & base
   -------------------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: clamp(1rem, 0.94rem + 0.3vw, 1.12rem);
  line-height: 1.68;
  color: var(--ink);
  background-color: var(--paper);
  /* two soft warm glows painted from the member + pink hues */
  background-image:
    radial-gradient(60rem 40rem at 85% -8%, var(--member-wash), transparent 60%),
    radial-gradient(48rem 34rem at -10% 12%, rgba(240, 192, 176, 0.4), transparent 55%);
  background-attachment: fixed;
  -webkit-text-size-adjust: 100%;
  text-rendering: optimizeLegibility;
}

h1, h2, h3 { font-family: var(--font-serif); font-weight: 600; line-height: 1.15; }

a { color: var(--brown-deep); }

em { font-style: italic; }

img, svg { max-width: 100%; }

/* Skip link — only surfaces on keyboard focus */
.skip-link {
  position: absolute;
  left: 0.6rem;
  top: -4rem;
  z-index: 20;
  padding: 0.55rem 1rem;
  border-radius: 0.6rem;
  background: var(--ink);
  color: var(--paper);
  text-decoration: none;
  transition: top 0.18s ease;
}
.skip-link:focus-visible { top: 0.6rem; }
.skip-link span + span::before { content: " · "; }

/* --------------------------------------------------------------------------
   3. Language toggle (CSS-only)
   The two rules below are the ONE sanctioned visibility mechanism. Because the
   radios live inside the fieldset, they are not siblings of <main>; the switch
   is read relationally with :has() on the fieldset. In a browser without :has()
   these rules are dropped and BOTH languages remain visible — an intentional,
   graceful degradation, not a bug.
   -------------------------------------------------------------------------- */
fieldset.lang-switch:has(#lang-en:checked) ~ main [lang="ja"] { display: none; }
fieldset.lang-switch:has(#lang-ja:checked) ~ main [lang="en"] { display: none; }

.lang-switch {
  position: sticky;
  top: 0;
  z-index: 10;
  margin: 0;
  border: 0;
  padding: 0.5rem var(--pad);
  text-align: center;
  background: rgba(255, 248, 234, 0.82);
  backdrop-filter: saturate(1.2) blur(8px);
  border-bottom: 1px solid var(--line);
}
.lang-switch legend {
  display: inline-block;
  padding: 0;
  margin-right: 0.75rem;
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-soft);
}
.lang-switch__options { display: inline-flex; gap: 0.35rem; vertical-align: middle; }

/* radios kept in the accessibility tree and keyboard-focusable, visually hidden */
.lang-switch input {
  position: absolute;
  width: 1px; height: 1px;
  margin: -1px; padding: 0; border: 0;
  clip: rect(0 0 0 0); clip-path: inset(50%);
  overflow: hidden; white-space: nowrap;
}
.lang-switch label {
  display: inline-block;
  padding: 0.32rem 0.95rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink-soft);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}
.lang-switch label:hover { border-color: var(--brown); }
.lang-switch input:checked + label {
  background: var(--member);
  border-color: var(--brown);
  color: var(--on-member-ink);
  box-shadow: 0 2px 0 rgba(154, 95, 56, 0.25);
}
.lang-switch input:focus-visible + label {
  outline: 3px solid var(--ring);
  outline-offset: 2px;
}

/* --------------------------------------------------------------------------
   4. Layout scaffolding
   -------------------------------------------------------------------------- */
.section { padding-block: clamp(3rem, 7vw, 5.5rem); }
.section > *:not(.keybar):not(.crescendo):not(.keys88):not(.palette) {
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--pad);
}
.section--links { background: rgba(240, 224, 176, 0.25); }

.section__title {
  font-size: clamp(1.7rem, 1.1rem + 2.6vw, 2.7rem);
  margin: 0 0 0.4rem;
  color: var(--ink);
}
.section__title::after {
  content: "";
  display: block;
  width: 3.2rem;
  height: 4px;
  margin-top: 0.7rem;
  border-radius: 4px;
  background: linear-gradient(90deg, var(--brown), var(--pink));
}
.section__lead { color: var(--ink-soft); margin: 0 0 2rem; max-width: 44rem; }

/* --------------------------------------------------------------------------
   5. Piano-key motif (drawn purely in CSS gradients)
   White keys with hairline separations; black keys grouped 2-and-3 like a
   real octave, with the E|F and B|C gaps.
   -------------------------------------------------------------------------- */
.keybar {
  height: 16px;
  width: 100%;
  background-image:
    repeating-linear-gradient(90deg,
      transparent 0 17px, var(--key-black) 17px 31px,
      transparent 31px 41px, var(--key-black) 41px 55px,
      transparent 55px 89px, var(--key-black) 89px 103px,
      transparent 103px 113px, var(--key-black) 113px 127px,
      transparent 127px 137px, var(--key-black) 137px 151px,
      transparent 151px 168px),
    repeating-linear-gradient(90deg,
      var(--key-line) 0 1px, var(--key-white) 1px 24px);
  background-size: 168px 62%, 24px 100%;
  background-position: center top, left top;
  background-repeat: repeat-x, repeat-x;
  border-bottom: 1px solid var(--key-line);
}
.keybar--footer { border-bottom: 0; border-top: 1px solid var(--key-line); }

/* The bigger keyboard shown in the fan-flair section */
.keys88 {
  height: 74px;
  max-width: var(--maxw);
  margin: 2.2rem auto 0;
  border-radius: 0.7rem;
  border-top: 5px solid var(--felt);
  overflow: hidden;
  box-shadow: var(--shadow);
  background-image:
    repeating-linear-gradient(90deg,
      transparent 0 24px, var(--key-black) 24px 44px,
      transparent 44px 58px, var(--key-black) 58px 78px,
      transparent 78px 126px, var(--key-black) 126px 146px,
      transparent 146px 160px, var(--key-black) 160px 180px,
      transparent 180px 194px, var(--key-black) 194px 214px,
      transparent 214px 238px),
    repeating-linear-gradient(90deg,
      var(--key-line) 0 1px, var(--key-white) 1px 34px);
  background-size: 238px 64%, 34px 100%;
  background-position: center top, left top;
  background-repeat: repeat-x, repeat-x;
}

/* Crescendo hairpin */
.crescendo {
  max-width: 18rem;
  margin: 0 auto 1.8rem;
  color: var(--brown);
}

/* --------------------------------------------------------------------------
   6. Hero / profile
   -------------------------------------------------------------------------- */
.section--hero { padding-top: 0; }
.hero__inner { padding-top: clamp(2.5rem, 6vw, 4.5rem); text-align: center; }
.hero__mark { font-size: 2rem; margin: 0 0 0.6rem; }
.hero__name {
  font-size: clamp(2.6rem, 1.4rem + 6vw, 5.2rem);
  margin: 0;
  letter-spacing: -0.01em;
  color: var(--ink);
}
.hero__name [lang="ja"] { letter-spacing: 0.04em; }
.hero__reading {
  margin: 0.2rem 0 0;
  font-size: 0.98rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--brown-deep);
}
.hero__tagline {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: clamp(1.1rem, 0.9rem + 1vw, 1.5rem);
  color: var(--brown-deep);
  margin: 1.1rem auto 0;
  max-width: 40rem;
}
.hero__lede { margin: 1.4rem auto 0; max-width: 42rem; }
.hero__lede em { color: var(--brown-deep); font-weight: 600; }

.namesake {
  margin: 2.2rem auto 0;
  max-width: 44rem;
  text-align: left;
  padding: 1.4rem 1.6rem;
  border-radius: 1rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-left: 5px solid var(--member);
  box-shadow: var(--shadow);
}
.namesake__label {
  margin: 0 0 0.5rem;
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--brown);
  font-weight: 700;
}
.namesake__body { margin: 0; }
.namesake__body em { font-style: italic; color: var(--brown-deep); }

/* Quick facts */
.facts {
  margin: 2.4rem auto 0;
  max-width: 44rem;
  display: grid;
  gap: 0.1rem;
  text-align: left;
}
.facts__row {
  display: grid;
  grid-template-columns: 10rem 1fr;
  gap: 1rem;
  padding: 0.7rem 0.2rem;
  border-bottom: 1px dashed var(--line);
}
.facts__row dt { margin: 0; color: var(--brown-deep); font-weight: 700; }
.facts__row dd { margin: 0; }

/* --------------------------------------------------------------------------
   7. Links hub
   -------------------------------------------------------------------------- */
.cards {
  list-style: none;
  margin: 0 auto;
  padding-inline: var(--pad);
  display: grid;
  gap: 1.1rem;
  grid-template-columns: 1fr;
}
.card {
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-rows: auto auto;
  column-gap: 1rem;
  align-items: center;
  padding: 1.3rem 1.4rem;
  border-radius: 1rem;
  background: var(--surface);
  border: 1px solid var(--line);
  color: var(--ink);
  text-decoration: none;
  box-shadow: var(--shadow);
  transition: transform 0.22s ease, box-shadow 0.22s ease, border-color 0.22s ease;
}
.card__icon {
  grid-row: 1 / 3;
  display: grid;
  place-items: center;
  width: 3.2rem;
  height: 3.2rem;
  border-radius: 0.85rem;
  background: var(--member);
  color: var(--on-member-ink);
}
.card__icon svg { width: 2rem; height: 2rem; }
.card__title { font-family: var(--font-serif); font-size: 1.35rem; font-weight: 600; }
.card__desc { color: var(--ink-soft); font-size: 0.95rem; }
.card:hover, .card:focus-visible {
  transform: translateY(-4px);
  border-color: var(--brown);
  box-shadow: 30px 34px 66px -30px rgba(67, 48, 31, 0.55);
}

/* --------------------------------------------------------------------------
   8. Watch
   -------------------------------------------------------------------------- */
.section--watch { text-align: center; }
.watch__note { color: var(--ink-soft); margin: 0 auto 1.8rem; max-width: 44rem; }

.watch__live {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0.95rem 2rem;
  border-radius: 999px;
  background: var(--brown-deep);
  color: var(--member);
  font-weight: 700;
  font-size: 1.12rem;
  text-decoration: none;
  box-shadow: 0 12px 30px -12px rgba(154, 95, 56, 0.8);
  transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
}
.watch__live:hover, .watch__live:focus-visible {
  transform: translateY(-3px);
  background: var(--ink);
  box-shadow: 0 18px 36px -14px rgba(67, 48, 31, 0.7);
}
.watch__pulse {
  width: 0.7rem;
  height: 0.7rem;
  border-radius: 50%;
  background: var(--pink);
  box-shadow: 0 0 0 0 rgba(240, 192, 176, 0.8);
  animation: pulse 2s ease-out infinite;
}

.watch__figure { margin: 2.6rem auto 0; max-width: 50rem; }
.watch__frame {
  position: relative;
  aspect-ratio: 16 / 9;
  border-radius: 1rem;
  overflow: hidden;
  border: 3px solid var(--member);
  box-shadow: var(--shadow);
  background: var(--ink);
}
.watch__frame iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
  display: block;
}
.watch__figure figcaption {
  margin-top: 0.9rem;
  font-family: var(--font-serif);
  font-style: italic;
  color: var(--ink-soft);
}

/* --------------------------------------------------------------------------
   9. Fan flair
   -------------------------------------------------------------------------- */
.section--flair { text-align: center; }
.flair__lead { margin-inline: auto; }

.palette {
  list-style: none;
  margin: 0 auto 0.6rem;
  padding: 0 var(--pad);
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.9rem;
}
.palette__chip {
  position: relative;
  width: 6rem;
  height: 6rem;
  border-radius: 1rem;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}
.palette__chip::after {
  content: attr(data-hex);
  position: absolute;
  left: 0; right: 0; bottom: 0.4rem;
  font-family: var(--font-sans);
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  color: var(--on-member-ink);
  text-shadow: 0 1px 2px rgba(255, 253, 248, 0.7);
}
.palette__chip--member { background: var(--member); }
.palette__chip--brown  { background: var(--brown); }
.palette__chip--brown::after { color: var(--surface); text-shadow: none; }
.palette__chip--cream  { background: var(--cream); }
.palette__chip--gold   { background: var(--gold); }
.palette__chip--pink   { background: var(--pink); }

.dates {
  margin: 2.6rem auto 0;
  max-width: 40rem;
  padding: 1.6rem;
  border-radius: 1.1rem;
  background: linear-gradient(135deg, var(--member), var(--gold));
  border: 1px solid var(--brown);
  box-shadow: var(--shadow);
}
.dates__title {
  margin: 0 0 0.5rem;
  font-size: 1.5rem;
  color: var(--on-member-ink);
}
.dates__line { margin: 0; font-weight: 600; color: var(--on-member-ink); }

.flair__signoff { font-size: 1.8rem; margin: 2.4rem 0 0; }

/* --------------------------------------------------------------------------
   10. Footer
   Both languages remain visible here by design (the toggle only reaches
   elements inside <main>): a bilingual disclaimer is always shown in full.
   -------------------------------------------------------------------------- */
.site-footer { margin-top: 2rem; background: rgba(240, 240, 224, 0.5); }
.site-footer__inner {
  max-width: var(--maxw);
  margin-inline: auto;
  padding: 2.4rem var(--pad) 3rem;
  text-align: center;
}
.disclaimer {
  margin: 0 auto 1rem;
  max-width: 46rem;
  font-size: 0.86rem;
  color: var(--ink-soft);
  line-height: 1.7;
}
.disclaimer[lang="ja"] { color: var(--ink-soft); }
.site-footer__mark {
  margin: 1.2rem 0 0;
  font-family: var(--font-serif);
  letter-spacing: 0.1em;
  color: var(--brown-deep);
}

/* --------------------------------------------------------------------------
   11. Focus visibility (global)
   -------------------------------------------------------------------------- */
a:focus-visible,
.watch__live:focus-visible,
.card:focus-visible {
  outline: 3px solid var(--ring);
  outline-offset: 3px;
}
a { border-radius: 2px; }

/* --------------------------------------------------------------------------
   12. Motion — entrances, gentle idle motion, and the live pulse
   -------------------------------------------------------------------------- */
@keyframes rise {
  from { opacity: 0; transform: translateY(18px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes bob {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-6px); }
}
@keyframes pulse {
  0%   { box-shadow: 0 0 0 0 rgba(240, 192, 176, 0.8); }
  70%  { box-shadow: 0 0 0 0.7rem rgba(240, 192, 176, 0); }
  100% { box-shadow: 0 0 0 0 rgba(240, 192, 176, 0); }
}

.hero__mark { animation: bob 4.5s ease-in-out infinite; }
.hero__inner > * { animation: rise 0.7s ease both; }
.hero__inner > *:nth-child(2) { animation-delay: 0.06s; }
.hero__inner > *:nth-child(3) { animation-delay: 0.12s; }
.hero__inner > *:nth-child(4) { animation-delay: 0.18s; }
.hero__inner > *:nth-child(5) { animation-delay: 0.24s; }
.hero__inner > *:nth-child(6) { animation-delay: 0.30s; }
.hero__inner > *:nth-child(7) { animation-delay: 0.36s; }

/* --------------------------------------------------------------------------
   13. Responsive — mobile-first; widen at ~768px
   -------------------------------------------------------------------------- */
@media (min-width: 768px) {
  .cards { grid-template-columns: repeat(3, 1fr); }
  .card {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto auto;
    text-align: center;
    justify-items: center;
    row-gap: 0.4rem;
    padding: 1.8rem 1.4rem;
  }
  .card__icon { grid-row: auto; width: 3.6rem; height: 3.6rem; margin-bottom: 0.4rem; }
  .facts__row { grid-template-columns: 12rem 1fr; }
}

@media (min-width: 1280px) {
  .hero__inner { padding-top: 5rem; }
}

/* --------------------------------------------------------------------------
   14. Dark scheme
   Every value below is a LIGHTNESS-only shift of the same verified hues:
     background  = warm-brown hue (H~26deg), taken to very low lightness
     text        = cream / member hues, taken to high lightness
     accents     = member & warm-brown hues, lightness nudged for contrast
   No new hues are introduced.
   -------------------------------------------------------------------------- */
@media (prefers-color-scheme: dark) {
  :root {
    --member:      #FFE1A6;  /* member hue, slightly lower lightness */
    --member-wash: #3A2A17;  /* member hue, very low lightness (glow) */
    --brown:       #D89A6A;  /* warm-brown hue, raised lightness */
    --brown-deep:  #E7B487;  /* warm-brown hue, high lightness (links on dark) */
    --cream:       #E9E6D6;  /* cream hue, high lightness */
    --gold:        #E7D3A0;  /* gold hue, high lightness */
    --pink:        #E7B6A6;  /* pink hue, high lightness */

    --paper:       #1E150D;  /* warm-brown hue, very low lightness */
    --surface:     #2A1F14;  /* warm-brown hue, low lightness */
    --ink:         #F1E9D8;  /* cream hue, near-max lightness */
    --ink-soft:    #C9B79E;  /* warm-brown hue, mid-high lightness */
    --line:        rgba(231, 180, 135, 0.24);

    --key-white:   #E9E1CF;  /* cream hue for lit keys on dark */
    --key-black:   #17100A;  /* warm-brown hue, minimum lightness */
    --key-line:    rgba(23, 16, 10, 0.6);
    --felt:        #C77E64;  /* pink/brown hue, mid lightness */

    --ring:        #E7B487;
    --shadow:      24px 24px 60px -30px rgba(0, 0, 0, 0.7);
  }
  body {
    background-image:
      radial-gradient(60rem 40rem at 85% -8%, var(--member-wash), transparent 60%),
      radial-gradient(48rem 34rem at -10% 12%, rgba(199, 126, 100, 0.28), transparent 55%);
  }
  .lang-switch { background: rgba(30, 21, 13, 0.82); }
  .section--links { background: rgba(58, 42, 23, 0.4); }
  .site-footer { background: rgba(42, 31, 20, 0.6); }
  .watch__live { color: #2A1F14; }
  .palette__chip--brown::after { color: #1E150D; }
  /* Owner-tuned icon look for dark mode only: the inner square goes bright
     (--brown-deep is #E7B487 here) while the glyph pattern, filled with
     var(--paper) (#1E150D here), reads dark — bright background, dark motif.
     Light mode keeps the dark square + light motif from --on-member-ink. */
  .card__icon { color: var(--brown-deep); }
}

/* --------------------------------------------------------------------------
   15. Reduced motion — honour the user's preference for every animation
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  .hero__inner > * { opacity: 1; transform: none; }
}