/* ============================================================================
   kirari-core.css · Kirari English (キラリ英語) · SparkleSnap Learn English
   Design system for every screen surface. Link FIRST on every page.
   Warm paper, Kyoto red, matcha, sakura, mono eyebrows.
   © 2026 Cesar Borgenkrans · SparkleSnap. All rights reserved.
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Zen+Maru+Gothic:wght@500;700;900&family=Noto+Serif+JP:wght@500;700;900&family=Nunito:wght@600;700;800;900&family=Space+Mono:wght@400;700&display=swap');

/* ---- 1. Tokens ---------------------------------------------------------- */
:root {
  color-scheme: light;
  /* paper & ink */
  --paper:      #fffdf8;
  --paper-2:    #f7f4ee;
  --paper-3:    #efeae0;
  --card:       #ffffff;
  --ink:        #2d2926;
  --ink-soft:   #5b534d;
  --muted:      #7a7169;
  --line:       #eadfd5;
  --line-strong:#cdbfae;
  /* brand */
  --red:        #bb1e2c;   --red-bg:    #fbe9ea;
  --matcha:     #2b4c3e;   --matcha-bg: #e8ede3;
  --matcha-2:   #4b7057;
  --sakura:     #ffb7c5;   --sakura-2:  #ffe3ea;
  --gold:       #c89d45;   --gold-bg:   #fbf3e0;
  --teal:       #0f766e;   --teal-bg:   #e4f5f2;
  --sky:        #72b9ca;   --sky-bg:    #e9f4f7;
  --lilac:      #8170ad;   --lilac-bg:  #f1edf8;
  --coral:      #d86b81;   --coral-bg:  #fdeef1;
  --navy:       #102e40;
  --cyan:       #00f5ff;   /* rare signal only */
  --sunset-a:   #ff7e5f;   --sunset-b:  #feb47b;
  /* companions (text colour / bubble colour) */
  --tsuki:   #0e9488; --tsuki-bg:   #e7f8f2;
  --selene:  #6d28d9; --selene-bg:  #f2ecfd;
  --marina:  #be123c; --marina-bg:  #fff0f4;
  --sol:     #c96f2f; --sol-bg:     #fbf1de;
  --mofuna:  #6b4a3a; --mofuna-bg:  #f4ece6;
  --moko:    #8c7bb5; --moko-bg:    #f3f0fa;
  --kotoba:  #e0645a; --kotoba-bg:  #fde8e3;
  --shiori:  #4d6788; --shiori-bg:  #e9eff6;
  --chirabi: #ad7c43; --chirabi-bg: #fbf5ea;
  /* lanes */
  --lane-say:    var(--mofuna);  --lane-say-bg:    var(--mofuna-bg);
  --lane-notice: var(--tsuki);   --lane-notice-bg: var(--tsuki-bg);
  --lane-use:    var(--marina);  --lane-use-bg:    var(--marina-bg);
  --lane-work:   var(--sol);     --lane-work-bg:   var(--sol-bg);
  /* type */
  --f-jp:      'Zen Maru Gothic', 'Hiragino Maru Gothic ProN', 'Yu Gothic', 'Noto Sans JP', sans-serif;
  --f-display: 'Noto Serif JP', 'Yu Mincho', 'Hiragino Mincho ProN', Georgia, serif;
  --f-en:      'Nunito', 'Segoe UI', system-ui, sans-serif;
  --f-mono:    'Space Mono', ui-monospace, SFMono-Regular, Consolas, monospace;
  /* geometry */
  --r-sm: 8px; --r-md: 14px; --r-lg: 22px; --r-xl: 28px;
  --shadow-soft: 0 10px 30px rgba(45, 41, 38, .08);
  --shadow-pop:  6px 6px 0 rgba(45, 41, 38, .14);
  --shadow-lift: 0 22px 60px rgba(45, 41, 38, .12);
  --ease: cubic-bezier(.2, .8, .2, 1);
  --spring: cubic-bezier(.34, 1.56, .64, 1);
  --topbar-h: 64px;
}

/* ---- 2. Base ------------------------------------------------------------ */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; scroll-padding-top: calc(var(--topbar-h) + 12px); }
body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background-color: var(--paper);
  background-image:
    radial-gradient(circle at 10% 6%, rgba(255, 183, 197, .22), transparent 28rem),
    radial-gradient(circle at 92% 16%, rgba(232, 237, 227, .9), transparent 26rem),
    radial-gradient(circle at 70% 96%, rgba(200, 157, 69, .10), transparent 24rem),
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='w'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.045' numOctaves='3'/%3E%3CfeColorMatrix values='1 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 .045 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23w)'/%3E%3C/svg%3E");
  font-family: var(--f-jp);
  font-weight: 500;
  font-size: 16px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  cursor: url('../assets/brand/cursor.svg') 4 4, auto;
}
a, button, summary, label, [role="button"] { cursor: url('../assets/brand/cursor-active.svg') 4 4, pointer; }
img, svg, video, canvas { display: block; max-width: 100%; }
a { color: inherit; text-decoration-thickness: 1.5px; text-underline-offset: .18em; }
button, input, select, textarea { font: inherit; color: inherit; }
button { background: none; border: 0; padding: 0; }
h1, h2, h3, h4 { margin: 0 0 .4em; line-height: 1.25; font-weight: 700; text-wrap: balance; }
p { margin: 0 0 1em; text-wrap: pretty; }
::selection { background: var(--sakura); color: var(--ink); }
:where(a, button, input, select, textarea, summary, [tabindex]):focus-visible {
  outline: 3px solid var(--coral);
  outline-offset: 3px;
  border-radius: 6px;
}
[hidden] { display: none !important; }
.sr-only { position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
.k-skip {
  position: fixed; z-index: 1000; top: 10px; left: 12px;
  translate: 0 -200%;
  padding: 9px 14px;
  border: 2px solid var(--ink); border-radius: var(--r-sm);
  background: #fff; color: var(--ink);
  font: 700 12px var(--f-mono); letter-spacing: .06em;
}
.k-skip:focus { translate: 0; }

/* English target text everywhere */
.en, [lang="en"] { font-family: var(--f-en); font-weight: 700; letter-spacing: .005em; }
.en-xl { font-size: clamp(1.6rem, 3.6vw, 2.4rem); line-height: 1.25; }

/* ---- 3. Layout ---------------------------------------------------------- */
.k-wrap   { width: min(1120px, calc(100% - 40px)); margin-inline: auto; }
.k-narrow { width: min(760px, calc(100% - 32px)); margin-inline: auto; }
.k-medium { width: min(920px, calc(100% - 32px)); margin-inline: auto; }
.k-section { padding-block: clamp(40px, 7vw, 84px); }
.k-section--tight { padding-block: clamp(24px, 4vw, 44px); }
.k-grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.k-grid-3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.k-grid-4 { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; }
.k-stack > * + * { margin-top: 14px; }
.k-row { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 14px; }
.k-split { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr); gap: clamp(20px, 4vw, 48px); align-items: center; }
@media (max-width: 900px) { .k-grid-4 { grid-template-columns: repeat(2, 1fr); } .k-grid-3 { grid-template-columns: repeat(2, 1fr); } .k-split { grid-template-columns: 1fr; } }
@media (max-width: 600px) { .k-grid-2, .k-grid-3, .k-grid-4 { grid-template-columns: 1fr; } .k-wrap { width: calc(100% - 32px); } }

/* ---- 4. Topbar ---------------------------------------------------------- */
.k-top {
  position: sticky; top: 0; z-index: 50;
  display: flex; flex-wrap: wrap; align-items: center; gap: 12px 18px;
  min-height: var(--topbar-h);
  padding: 8px clamp(14px, 3vw, 28px);
  background-color: rgba(255, 253, 248, .9);
  background-image:
    linear-gradient(90deg, rgba(255,253,248,.42), rgba(255,253,248,.9) 16%, rgba(255,253,248,.92) 84%, rgba(255,253,248,.42)),
    url('../assets/collection/ui-header-background.webp');
  background-size: auto, cover;
  background-position: center, center 76%;
  background-repeat: no-repeat;
  backdrop-filter: blur(12px) saturate(1.1);
  -webkit-backdrop-filter: blur(12px) saturate(1.1);
  border-bottom: 1px dashed var(--line-strong);
}
.k-home {
  width: 42px; height: 42px; flex: 0 0 42px;
  display: grid; place-items: center;
  border: 1px solid var(--line-strong); border-radius: 12px;
  background: rgba(255,255,255,.8);
  box-shadow: 0 6px 18px rgba(45,41,38,.08);
  transition: transform .18s var(--ease), box-shadow .18s var(--ease);
}
.k-home img { width: 34px; height: 34px; object-fit: contain; }
.k-home:hover, .k-home:focus-visible { transform: translateY(-2px); box-shadow: 0 10px 24px rgba(45,41,38,.14); }
.k-brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; margin-right: auto; min-width: 0; }
.k-brand__mark {
  width: 38px; height: 38px; display: grid; place-items: center;
  border-radius: 50%; color: #fff; background: var(--red);
  font: 900 20px/1 var(--f-display);
  box-shadow: inset 0 0 0 2px rgba(255,255,255,.35), 0 6px 16px rgba(187,30,44,.22);
}
.k-brand__name { display: flex; flex-direction: column; line-height: 1.05; }
.k-brand__name b { font: 700 1.05rem var(--f-display); color: var(--ink); letter-spacing: .02em; }
/* β while the new Japanese waits for its native check (docs/NATIVE-CHECK.md); delete this rule at full launch. */
.k-brand__name b::after { content: "β"; display: inline-block; margin-left: 6px; padding: 0 6px; border-radius: 999px; background: var(--gold-bg); color: var(--gold); font: 800 .72rem/1.5 var(--f-en); vertical-align: 2px; }
.k-brand__name small { font: 700 9.5px var(--f-mono); letter-spacing: .14em; text-transform: uppercase; color: var(--red); margin-top: 3px; }
.k-nav { display: flex; flex-wrap: wrap; gap: 6px 16px; }
.k-nav a {
  font: 700 .95rem/1.2 var(--f-jp); letter-spacing: .01em;
  color: var(--ink-soft); text-decoration: none; padding: 6px 2px;
  border-bottom: 2px solid transparent;
}
.k-nav a:hover, .k-nav a:focus-visible, .k-nav a[aria-current="page"] { color: var(--red); border-bottom-color: var(--red); }
.k-nav__az { color: var(--ink) !important; border: 1.5px solid var(--ink); border-radius: 999px; padding: 4px 10px !important; letter-spacing: .02em; }
.k-nav__az[aria-current="page"] { background: var(--ink); color: var(--paper) !important; border-bottom-color: transparent; }
.k-az {
  display: flex; align-items: stretch; gap: 8px;
  flex: 1 0 100%;
  min-width: 0;
  margin: 0 -4px;
}
.k-az__all {
  flex: 0 0 auto; align-self: center;
  padding: 4px 8px; border-radius: 8px;
  font: 800 11px var(--f-mono); letter-spacing: .12em; text-decoration: none;
  color: var(--paper); background: var(--ink);
}
.k-az__row {
  display: flex; gap: 2px; overflow-x: auto; overscroll-behavior-x: contain;
  scrollbar-width: none; padding: 2px 0; min-width: 0;
}
.k-az__row::-webkit-scrollbar { display: none; }
.k-az__key {
  flex: 0 0 30px; height: 30px; display: grid; place-items: center;
  border-radius: 8px; text-decoration: none;
  font: 800 15px/1 var(--f-en); color: var(--ink);
  background: rgba(255,255,255,.72); border: 1px solid transparent;
}
.k-az__key:hover, .k-az__key:focus-visible { border-color: var(--ink); }
.k-az__key.is-on { background: var(--ink); color: var(--paper); }
.k-az__key.is-rusty { box-shadow: inset 0 -2px 0 var(--gold); }
.k-top__tools { display: flex; align-items: center; gap: 8px; }
.k-lang {
  display: inline-flex; align-items: center; gap: 6px;
  min-height: 36px; padding: 6px 12px;
  border: 1.5px solid var(--line-strong); border-radius: 999px;
  background: #fff; font: 700 11px var(--f-mono); letter-spacing: .08em;
  color: var(--ink-soft);
}
.k-lang b { color: var(--red); }
.k-lang:hover { border-color: var(--red); }
.k-sparkles {
  display: inline-flex; align-items: center; gap: 6px;
  min-height: 36px; padding: 6px 12px 6px 10px;
  border-radius: 999px; background: var(--gold-bg); color: #7a5a14;
  border: 1.5px solid rgba(200,157,69,.45);
  font: 800 12px var(--f-en); text-decoration: none;
}
.k-sparkles::before { content: "✦"; color: var(--gold); font-size: 13px; }
.k-sparkles::after { content: "きろく"; font: 700 12px var(--f-jp); letter-spacing: .02em; }
html[data-ui-lang="en"] .k-sparkles::after { content: "saved"; letter-spacing: .04em; }
@media (max-width: 1080px) {
  .k-nav { display: none; }
  .k-top--with-mobile-nav .k-nav { display: flex; order: 10; width: 100%; justify-content: center; gap: 4px 14px; padding-bottom: 4px; }
  .k-brand__name small { display: none; }
}
@media (max-width: 760px) {
  .k-top {
    background-image:
      linear-gradient(180deg, rgba(255,253,248,.9), rgba(255,253,248,.94)),
      url('../assets/collection/ui-header-background.webp');
    background-position: center, center 42%;
  }
}

/* ---- 5. Typography ------------------------------------------------------ */
.eyebrow {
  margin: 0 0 8px;
  font: 700 11px var(--f-mono); letter-spacing: .2em; text-transform: uppercase;
  color: var(--red);
}
.eyebrow--matcha { color: var(--matcha-2); }
.eyebrow--muted { color: var(--muted); }
.k-display {
  font-family: var(--f-display); font-weight: 900;
  font-size: clamp(2rem, 5.2vw, 3.6rem); line-height: 1.15; letter-spacing: -.01em;
  color: var(--ink); margin: 0 0 .35em;
}
.k-display em, .k-title em { font-style: normal; color: var(--red); }
.k-display .en, .k-title .en { font-weight: 900; }
.k-title { font-family: var(--f-display); font-weight: 700; font-size: clamp(1.5rem, 3.2vw, 2.3rem); line-height: 1.2; }
.k-h3 { font-family: var(--f-display); font-weight: 700; font-size: 1.2rem; color: var(--matcha); }
.k-lede { font-size: clamp(1rem, 1.6vw, 1.12rem); color: var(--ink-soft); max-width: 62ch; }
.k-kicker { font: 700 .8rem var(--f-jp); color: var(--matcha-2); letter-spacing: .04em; }
.muted { color: var(--ink-soft); }
.center { text-align: center; }
.nowrap { white-space: nowrap; }
.k-note {
  margin: 14px 0; padding: 12px 16px;
  border-left: 4px solid var(--sakura); border-radius: 0 var(--r-md) var(--r-md) 0;
  background: rgba(255,255,255,.72); color: var(--ink-soft); font-size: .95rem;
}
.k-note--matcha { border-left-color: var(--matcha-2); }
.k-note--gold { border-left-color: var(--gold); }
.hr-soft { border: 0; border-top: 2px dotted var(--line-strong); margin: 24px 0; }
mark.hl { background: linear-gradient(transparent 55%, var(--sakura-2) 55%); padding: 0 2px; color: inherit; }
mark.hl--matcha { background: linear-gradient(transparent 55%, var(--matcha-bg) 55%); }
mark.hl--gold { background: linear-gradient(transparent 55%, var(--gold-bg) 55%); }
.k-honest {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 4px 10px; border-radius: 999px;
  background: var(--sky-bg); color: #2a5f6c; border: 1px solid rgba(114,185,202,.5);
  font: 700 10.5px var(--f-mono); letter-spacing: .06em;
}
.k-honest::before { content: "ⓘ"; }

/* ---- 6. Chips, seals, buttons ------------------------------------------ */
.k-chip {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 4px 11px; border-radius: 999px;
  background: var(--matcha-bg); color: var(--matcha); border: 1px solid rgba(43,76,62,.22);
  font: 700 10.5px var(--f-mono); letter-spacing: .06em; text-transform: uppercase;
}
.k-chip--say    { background: var(--lane-say-bg);    color: var(--lane-say);    border-color: rgba(107,74,58,.3); }
.k-chip--notice { background: var(--lane-notice-bg); color: var(--lane-notice); border-color: rgba(14,148,136,.3); }
.k-chip--use    { background: var(--lane-use-bg);    color: var(--lane-use);    border-color: rgba(190,18,60,.3); }
.k-chip--work   { background: var(--lane-work-bg);   color: var(--lane-work);   border-color: rgba(201,111,47,.35); }
.k-chip--gold   { background: var(--gold-bg); color: #7a5a14; border-color: rgba(200,157,69,.45); }
.k-chip--red    { background: var(--red); color: #fff; border-color: var(--red); }
.k-chip--ghost  { background: rgba(255,255,255,.7); color: var(--ink-soft); border-color: var(--line-strong); }
.k-seal {
  display: inline-grid; place-items: center;
  width: 60px; height: 60px; transform: rotate(-7deg);
  border: 3px solid var(--red); border-radius: 12px; color: var(--red);
  background: rgba(255,255,255,.7); box-shadow: inset 0 0 0 2px rgba(187,30,44,.22);
  font: 900 1.5rem/1 var(--f-display);
}
.k-cta {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 48px; padding: 12px 26px; border-radius: 999px;
  font: 800 .98rem var(--f-jp); text-decoration: none; letter-spacing: .02em;
  transition: transform .18s var(--ease), box-shadow .18s var(--ease), background .18s;
}
.k-cta:hover, .k-cta:focus-visible { transform: translateY(-2px); }
.k-cta:active { transform: translateY(1px); }
.k-cta--sunset { color: #fff; background: linear-gradient(135deg, var(--sunset-a), var(--sunset-b)); box-shadow: 0 10px 24px rgba(255,126,95,.28); }
.k-cta--red    { color: #fff; background: var(--red); box-shadow: 0 10px 24px rgba(187,30,44,.22); }
.k-cta--ink    { color: var(--paper); background: var(--ink); }
.k-cta--matcha { color: #fff; background: var(--matcha); box-shadow: 0 10px 24px rgba(43,76,62,.2); }
.k-cta--glass  { color: var(--matcha); background: rgba(255,255,255,.7); border: 1.5px solid var(--line-strong); }
.k-cta--quiet  { color: var(--ink-soft); background: transparent; border: 1.5px solid var(--line-strong); }
.k-cta--sm { min-height: 40px; padding: 8px 18px; font-size: .9rem; }
.k-cta[disabled], .k-cta[aria-disabled="true"] { opacity: .5; pointer-events: none; }

/* ---- 7. Cards & doorways ------------------------------------------------ */
.k-card {
  position: relative;
  border: 1.5px solid var(--line); border-radius: var(--r-lg);
  background: rgba(255,255,255,.82);
  box-shadow: var(--shadow-soft);
  padding: clamp(18px, 2.6vw, 26px);
}
.k-card--paper { background: linear-gradient(160deg, #fff, var(--paper-2)); }
.k-card--flat { box-shadow: none; }
.k-card--pop { box-shadow: var(--shadow-pop); border-color: var(--ink); border-width: 2px; }
.k-card__title { font-family: var(--f-display); font-size: 1.25rem; margin-bottom: 6px; }
.k-card__kind { font: 700 10px var(--f-mono); letter-spacing: .12em; text-transform: uppercase; color: var(--muted); margin-bottom: 6px; }
.k-doorway {
  position: relative; display: block; overflow: hidden;
  border-radius: var(--r-xl); aspect-ratio: 4 / 3;
  text-decoration: none; color: inherit;
  box-shadow: var(--shadow-lift);
  isolation: isolate;
}
.k-doorway img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; transition: transform 1.2s var(--ease); }
.k-doorway:hover img, .k-doorway:focus-visible img { transform: scale(1.035); }
.k-doorway__frame {
  --angle: 0deg;
  position: absolute; inset: 0; z-index: 2; pointer-events: none;
  border: 4px solid transparent; border-radius: inherit;
  background: conic-gradient(from var(--angle), #cfe7f3, #e1dcf1, #f5dce0, #f8e8bd, #d8eee4, #cfe7f3);
  background-origin: border-box;
  -webkit-mask: linear-gradient(#fff 0 0) padding-box, linear-gradient(#fff 0 0) border-box;
  -webkit-mask-composite: xor; mask: linear-gradient(#fff 0 0) padding-box, linear-gradient(#fff 0 0) border-box; mask-composite: exclude;
  animation: k-frame-spin 40s linear infinite;
}
@property --angle { syntax: '<angle>'; inherits: false; initial-value: 0deg; }
@keyframes k-frame-spin { to { --angle: 360deg; } }
.k-doorway__chip {
  position: absolute; left: 14px; bottom: 14px; z-index: 3;
  display: inline-flex; align-items: center; gap: 8px;
  padding: 8px 14px; border-radius: 999px;
  background: rgba(255,253,248,.92); color: var(--ink);
  font: 800 .85rem var(--f-jp); box-shadow: 0 6px 18px rgba(0,0,0,.14);
}
.k-doorway__chip small { font: 700 9px var(--f-mono); letter-spacing: .12em; text-transform: uppercase; color: var(--red); }

/* catalogue lesson cards */
.k-lesson {
  position: relative; display: flex; flex-direction: column; gap: 6px;
  padding: 18px 18px 16px 22px;
  border: 1.5px solid var(--line); border-radius: var(--r-lg);
  background: rgba(255,255,255,.86); text-decoration: none; color: inherit;
  box-shadow: var(--shadow-soft); overflow: hidden;
  transition: transform .2s var(--ease), box-shadow .2s var(--ease), border-color .2s;
}
.k-lesson::before { content: ""; position: absolute; inset: 0 auto 0 0; width: 6px; background: var(--lane-color, var(--matcha-2)); }
.k-lesson:hover, .k-lesson:focus-visible { transform: translateY(-3px); box-shadow: var(--shadow-lift); border-color: var(--lane-color, var(--matcha-2)); }
.k-lesson--say    { --lane-color: var(--lane-say); }
.k-lesson--notice { --lane-color: var(--lane-notice); }
.k-lesson--use    { --lane-color: var(--lane-use); }
.k-lesson--work   { --lane-color: var(--lane-work); }
.k-lesson__kind { font: 700 10px var(--f-mono); letter-spacing: .12em; text-transform: uppercase; color: var(--lane-color, var(--muted)); }
.k-lesson__title { font: 700 1.12rem/1.3 var(--f-display); margin: 0; }
.k-lesson__title .en { font-size: .95em; color: var(--ink-soft); font-weight: 800; }
.k-lesson__copy { margin: 0; color: var(--ink-soft); font-size: .92rem; }
.k-lesson__route { margin-top: auto; padding-top: 8px; font: 700 10.5px var(--f-mono); letter-spacing: .08em; color: var(--muted); }
.k-lesson__done { position: absolute; top: 12px; right: 12px; width: 26px; height: 26px; display: grid; place-items: center; border-radius: 50%; background: var(--gold-bg); color: var(--gold); font-size: 14px; border: 1px solid rgba(200,157,69,.45); }
.k-lesson:not(.is-done) .k-lesson__done { display: none; }

/* ---- 8. Route map (the four lanes) -------------------------------------- */
.k-route { display: grid; grid-template-columns: repeat(4, 1fr); border: 2px solid var(--ink); border-radius: var(--r-md); overflow: hidden; background: #fff; }
.k-route a { display: flex; flex-direction: column; gap: 2px; padding: 14px 16px; text-decoration: none; color: var(--ink); border-right: 1px solid var(--line-strong); transition: background .2s; }
.k-route a:last-child { border-right: 0; }
.k-route a:hover, .k-route a:focus-visible { background: var(--lane-bg, var(--paper-2)); }
.k-route b { font: 700 .95rem var(--f-jp); }
.k-route small { font: 700 9.5px var(--f-mono); letter-spacing: .12em; text-transform: uppercase; color: var(--lane-color, var(--muted)); }
.k-route .lane-say    { --lane-color: var(--lane-say);    --lane-bg: var(--lane-say-bg); }
.k-route .lane-notice { --lane-color: var(--lane-notice); --lane-bg: var(--lane-notice-bg); }
.k-route .lane-use    { --lane-color: var(--lane-use);    --lane-bg: var(--lane-use-bg); }
.k-route .lane-work   { --lane-color: var(--lane-work);   --lane-bg: var(--lane-work-bg); }
@media (max-width: 700px) { .k-route { grid-template-columns: repeat(2, 1fr); } .k-route a:nth-child(2) { border-right: 0; } .k-route a:nth-child(-n+2) { border-bottom: 1px solid var(--line-strong); } }

/* ---- 9. The English line (4 layers) ------------------------------------- */
.en-line { margin: 12px 0; }
.en-line .en-main  { font: 800 clamp(1.25rem, 2.6vw, 1.7rem)/1.3 var(--f-en); color: var(--ink); margin: 0 0 3px; }
.en-line .en-main.big { font-size: clamp(1.7rem, 4vw, 2.5rem); }
.en-line .en-sound { font: 400 .86rem var(--f-mono); color: var(--teal); margin: 0 0 2px; letter-spacing: .01em; }
.en-line .en-sound b { font-weight: 700; color: var(--red); }
.en-line .en-gloss { margin: 0; color: var(--ink-soft); font-size: .98rem; }
.en-line .en-note  { margin: 4px 0 0; color: var(--matcha-2); font-size: .88rem; }
.en-line .en-note::before { content: "✎ "; }
.beat { font-family: var(--f-en); font-weight: 700; }
.beat b { color: var(--red); font-weight: 900; }
.en-wrong { text-decoration: line-through rgba(187,30,44,.6) 2px; color: var(--muted); }
.en-right { color: var(--matcha); }

/* say button (browser voice) */
.say {
  display: inline-flex; align-items: center; gap: 8px;
  min-height: 40px; padding: 7px 14px 7px 12px;
  border: 1.5px solid var(--line-strong); border-radius: 999px;
  background: #fff; color: var(--ink);
  font: 800 .88rem var(--f-jp);
  transition: border-color .18s, transform .18s var(--ease), background .18s;
}
.say::before { content: "▶"; font-size: 11px; color: var(--red); }
.say:hover { border-color: var(--red); transform: translateY(-1px); }
.say[aria-pressed="true"] { background: var(--red-bg); border-color: var(--red); }
.say[aria-pressed="true"]::before { content: "◼"; }
.say--slow::before { content: "🐢"; font-size: 13px; }
.say--slow[aria-pressed="true"]::before { content: "◼"; }
.say--ink { background: var(--ink); color: #fff; border-color: var(--ink); }
.say--ink::before { color: var(--sunset-b); }
.echo { min-height: 1.4em; margin: 6px 0 0; font-size: .86rem; color: var(--ink-soft); }
.echo.is-ready { color: var(--matcha); font-weight: 700; }
.mic {
  display: inline-flex; align-items: center; gap: 8px; min-height: 40px; padding: 7px 14px;
  border-radius: 999px; border: 1.5px dashed var(--line-strong); background: rgba(255,255,255,.7);
  font: 800 .88rem var(--f-jp); color: var(--ink-soft);
}
.mic::before { content: "🎙"; }
.mic[aria-pressed="true"] { border-style: solid; border-color: var(--coral); color: var(--coral); animation: k-pulse 1.2s ease-in-out infinite; }
@keyframes k-pulse { 50% { box-shadow: 0 0 0 6px rgba(216,107,129,.18); } }

/* ---- 10. Stage (an illustration standing on the page) --------------- */
.sprite-stage { position: relative; display: grid; place-items: end center; }

/* ---- 11. Dialogue bubbles ----------------------------------------------- */
.bubble {
  position: relative; align-self: flex-start; max-width: min(100%, 560px);
  padding: 13px 16px 12px;
  border: 1.5px solid var(--bub-line, var(--line-strong)); border-radius: 22px 22px 22px 8px;
  background: var(--bub-bg, #fff); color: var(--ink);
  box-shadow: 0 12px 28px rgba(45,41,38,.08);
  font-weight: 600; line-height: 1.55;
}
.bubble > strong:first-child, .bubble .who {
  display: block; margin: 0 0 4px;
  font: 700 10px var(--f-mono); letter-spacing: .14em; text-transform: uppercase; color: var(--bub-name, var(--ink-soft));
}
.bubble::after { content: ""; position: absolute; bottom: -8px; left: 22px; width: 15px; height: 15px; background: var(--bub-bg, #fff);
  border-left: 1.5px solid var(--bub-line, var(--line-strong)); border-bottom: 1.5px solid var(--bub-line, var(--line-strong)); border-radius: 0 0 0 13px; transform: rotate(-22deg); }
.bubble.right { align-self: flex-end; border-radius: 22px 22px 8px 22px; }
.bubble.right::after { left: auto; right: 22px; border-left: 0; border-right: 1.5px solid var(--bub-line, var(--line-strong)); border-radius: 0 0 13px 0; transform: rotate(22deg); }
.bubble .en-line { margin: 4px 0 0; }
.bubble .en-line .en-main { font-size: clamp(1.1rem, 2.2vw, 1.35rem); }
.b-tsuki  { --bub-bg: var(--tsuki-bg);  --bub-line: rgba(14,148,136,.45);  --bub-name: var(--tsuki); }
.b-marina { --bub-bg: var(--marina-bg); --bub-line: rgba(190,18,60,.4);   --bub-name: var(--marina); }
.b-sol    { --bub-bg: var(--sol-bg);    --bub-line: rgba(201,111,47,.45); --bub-name: #7d3824; }
.b-mofuna { --bub-bg: var(--mofuna-bg); --bub-line: rgba(107,74,58,.4);   --bub-name: var(--mofuna); }
/* a turn = one bubble row */
.turn { display: flex; gap: 12px; align-items: flex-end; }
.turn.right { flex-direction: row-reverse; }
.turn.right .bubble { align-self: auto; border-radius: 22px 22px 8px 22px; }
.turn.right .bubble::after { left: auto; right: 22px; border-left: 0; border-right: 1.5px solid var(--bub-line, var(--line-strong)); border-radius: 0 0 13px 0; transform: rotate(22deg); }

/* ---- 12. Pattern Story Card (signature) --------------------------------- */
.pattern-card {
  border: 2.5px solid var(--ink); border-radius: var(--r-md); overflow: hidden;
  background: var(--card); box-shadow: var(--shadow-pop); margin: 10px 0;
}
.pattern-card__top { display: grid; grid-template-columns: minmax(150px, 190px) 1fr; }
.pattern-card__glyph {
  position: relative; display: grid; place-items: center; padding: 18px 14px;
  background: radial-gradient(circle at 50% 35%, #fff 0, var(--matcha-bg) 100%); border-right: 2.5px solid var(--ink);
}
.pattern-card__glyph .glyph { font: 900 clamp(1.8rem, 4vw, 2.6rem)/1.1 var(--f-en); color: var(--ink); text-align: center; }
.pattern-card__glyph .glyph b { color: var(--red); }
.pattern-card__glyph .label { position: absolute; bottom: 8px; right: 10px; font: 700 9.5px var(--f-mono); letter-spacing: .1em; text-transform: uppercase; color: var(--ink-soft); }
.pattern-card__id { padding: 14px 16px; }
.pattern-card__no { font: 700 10px var(--f-mono); letter-spacing: .14em; text-transform: uppercase; color: var(--red); }
.pattern-card__name { font: 700 1.3rem/1.25 var(--f-display); color: var(--matcha); margin: 4px 0; }
.pattern-card__meaning { color: var(--ink-soft); font-size: .95rem; margin: 0 0 8px; }
.pattern-card .facts { display: grid; grid-template-columns: 1fr 1fr; gap: 4px 14px; }
.pattern-card .facts .f { display: flex; gap: 6px; font-size: .86rem; }
.pattern-card .facts .f b { min-width: 58px; padding-top: 2px; font: 700 9.5px var(--f-mono); letter-spacing: .05em; text-transform: uppercase; color: var(--ink-soft); }
.pattern-card .facts .f .v { font-family: var(--f-en); font-weight: 700; }
.pattern-card__story { padding: 14px 16px; background: var(--paper); border-top: 2px dashed var(--line-strong); }
.pattern-card__story .story-h { font: 700 10px var(--f-mono); letter-spacing: .12em; text-transform: uppercase; color: var(--teal); margin-bottom: 4px; }
.pattern-card__story p { margin: 0 0 8px; font-size: .95rem; }
.pattern-card__hook { font-style: normal; color: var(--matcha); border-left: 4px solid var(--sakura); padding-left: 10px; }
.pattern-card .wild { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; padding: 12px 16px; background: var(--card); border-top: 2.5px solid var(--ink); }
.pattern-card .wild .w { background: var(--teal-bg); border: 1.5px solid rgba(15,118,110,.3); border-radius: 9px; padding: 8px; text-align: center; }
.pattern-card .wild .w .wen { font: 800 1rem var(--f-en); }
.pattern-card .wild .w .wjp { font-size: .8rem; color: var(--ink-soft); }
.pattern-card .recruited { display: flex; align-items: center; gap: 8px; padding: 9px 16px; background: var(--matcha); color: #fff; font: 700 11px var(--f-mono); letter-spacing: .08em; }
.pattern-card .recruited .tick { width: 18px; height: 18px; border-radius: 50%; background: #fff; color: var(--matcha); display: grid; place-items: center; font-weight: 900; }
@media (max-width: 560px) { .pattern-card__top { grid-template-columns: 1fr; } .pattern-card__glyph { border-right: 0; border-bottom: 2.5px solid var(--ink); } .pattern-card .wild { grid-template-columns: 1fr; } }

/* ---- 13. Quest (autonomy-supportive) ------------------------------------ */
.quest {
  position: relative; margin: 26px 0 14px; padding: 18px 18px 14px;
  border: 2px solid var(--gold); border-radius: var(--r-md);
  background: linear-gradient(135deg, #fffdf5, #fff); box-shadow: var(--shadow-soft);
}
.quest::before { content: var(--quest-label, "⭐ クエスト"); position: absolute; top: -13px; left: 16px; padding: 3px 12px; border-radius: 6px;
  background: var(--gold); color: #fff; font: 700 11px var(--f-mono); letter-spacing: .1em; }
.quest h3 { color: #8a6a1e; margin: 4px 0 6px; font-family: var(--f-display); }
.cando { list-style: none; padding: 0; margin: 8px 0 0; }
.cando li { display: flex; align-items: center; gap: 10px; padding: 8px 0; border-bottom: 1px dotted #e4dcc4; font-size: .98rem; }
.cando li:last-child { border-bottom: 0; }
.cando .box { width: 22px; height: 22px; flex: 0 0 auto; border: 2px solid var(--gold); border-radius: 6px; display: grid; place-items: center; font-size: 13px; color: var(--gold); background: #fff; }
.cando li.is-done .box::after { content: "✓"; }
.cando li.is-done { color: var(--ink-soft); }

/* ---- 14. Interaction primitives ----------------------------------------- */
.k-reveal { cursor: pointer; border: 2px dashed var(--sky); border-radius: var(--r-md); background: linear-gradient(135deg, var(--sky-bg), #fff 70%); padding: 13px 15px; margin: 14px 0; }
.k-reveal .k-reveal__h { font: 700 10px var(--f-mono); letter-spacing: .12em; text-transform: uppercase; color: #2a5f6c; }
.k-reveal .k-reveal__tap { margin: 5px 0 0; font-size: .92rem; color: var(--ink-soft); }
.k-reveal .k-reveal__body { display: none; margin-top: 6px; }
.k-reveal.open .k-reveal__body { display: block; }
.k-reveal.open .k-reveal__tap { display: none; }
.k-choices { display: grid; gap: 8px; margin: 10px 0; }
.k-choices--row { grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); }
.k-choice {
  display: flex; align-items: center; gap: 10px; text-align: left;
  min-height: 48px; padding: 10px 14px;
  border: 2px solid var(--line-strong); border-radius: var(--r-md); background: #fff;
  font: 700 1rem var(--f-jp); color: var(--ink);
  transition: transform .12s, border-color .18s, background .18s;
}
.k-choice .en { font-size: 1.02rem; }
.k-choice:hover { border-color: var(--ink); }
.k-choice:active { transform: scale(.985); }
.k-choice.is-ok { border-color: #2e7d32; background: #eef8ee; }
.k-choice.is-no { border-color: var(--red); background: var(--red-bg); }
.k-choice[disabled] { opacity: .65; }
.k-feedback { min-height: 1.5em; margin: 8px 0 0; font-size: .92rem; color: var(--ink-soft); }
.k-feedback.is-ok { color: #2e7d32; font-weight: 700; }
.k-feedback.is-no { color: var(--red); }
.k-progress { height: 8px; border-radius: 999px; background: var(--paper-3); overflow: hidden; }
.k-progress > i { display: block; height: 100%; width: var(--p, 0%); background: linear-gradient(90deg, var(--sunset-a), var(--sunset-b)); border-radius: inherit; transition: width .5s var(--ease); }
.k-pill-group { display: inline-flex; border: 1.5px solid var(--line-strong); border-radius: 999px; overflow: hidden; background: #fff; }
.k-pill-group button { padding: 8px 14px; font: 700 .85rem var(--f-jp); color: var(--ink-soft); }
.k-pill-group button[aria-pressed="true"] { background: var(--ink); color: #fff; }
.k-input { width: 100%; min-height: 46px; padding: 10px 14px; border: 2px solid var(--line-strong); border-radius: var(--r-md); background: #fff; font: 700 1rem var(--f-en); }
.k-input:focus { border-color: var(--red); outline: none; }
.k-out { padding: 14px 16px; border-radius: var(--r-md); background: var(--paper-2); border: 1.5px dashed var(--line-strong); font: 800 1.15rem/1.5 var(--f-en); }

/* ---- 15. Toast, petals, sparkles --------------------------------------- */
.k-toast {
  position: fixed; left: 50%; bottom: 22px; z-index: 900;
  display: flex; align-items: center; gap: 12px;
  padding: 10px 16px 10px 10px;
  border: 2px solid var(--ink); border-radius: 18px; background: #fffaf4; color: var(--ink);
  box-shadow: 0 6px 0 var(--ink);
  transform: translate(-50%, 24px); opacity: 0; pointer-events: none;
  transition: transform .35s var(--spring), opacity .25s;
  max-width: calc(100vw - 32px);
}
.k-toast.is-on { transform: translate(-50%, 0); opacity: 1; }
.k-toast__mark { width: 64px; height: 64px; flex: 0 0 64px; object-fit: contain; display: block; }
.k-toast b { display: block; font: 800 1rem var(--f-jp); }
.k-toast small { display: block; font: 700 10px var(--f-mono); letter-spacing: .1em; text-transform: uppercase; color: var(--gold); }
.petal { position: fixed; top: -24px; width: 12px; height: 12px; background: var(--sakura); border-radius: 50% 0 50% 50%; opacity: .7; pointer-events: none; z-index: 0; animation: k-fall linear infinite; }
@keyframes k-fall { to { transform: translateY(112vh) rotate(380deg); } }
.k-spark { position: fixed; width: 10px; height: 10px; pointer-events: none; z-index: 0; opacity: 0;
  background: radial-gradient(circle, #fff 0 2px, rgba(200,157,69,.9) 3px, transparent 6px); animation: k-twinkle var(--d, 9s) ease-in-out var(--delay, 0s) infinite; }
@keyframes k-twinkle { 0%, 100% { opacity: 0; transform: scale(.6); } 50% { opacity: .9; transform: scale(1.3); } }

/* ---- 16. Footer --------------------------------------------------------- */
.k-foot {
  margin-top: clamp(36px, 6vw, 72px);
  padding: 22px 0 0;
  border-top: none;
  color: var(--ink-soft); font-size: .88rem;
  background: var(--paper);
}
.k-foot::after {
  content: "";
  display: block;
  height: 128px;
  margin-top: 18px;
  background: url('../assets/collection/ui-footer-background.webp') center bottom / 100% auto no-repeat;
  pointer-events: none;
}
.k-ornament {
  height: 76px;
  margin: 0 auto;
  background: url('../assets/collection/ui-section-divider.webp') center / auto 240px no-repeat;
  pointer-events: none;
}
.k-foot__inner { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px 24px; align-items: center; }
.k-foot a { color: var(--ink-soft); }
.k-foot a:hover { color: var(--red); }
.k-foot__brand { display: inline-flex; align-items: center; gap: 8px; font: 700 .9rem var(--f-display); color: var(--ink); text-decoration: none; }
.k-foot__brand img { width: 26px; height: 26px; border-radius: 7px; }
.k-foot__links { display: flex; flex-wrap: wrap; gap: 8px 16px; font: 700 10.5px var(--f-mono); letter-spacing: .1em; text-transform: uppercase; }

/* ---- 17. Lesson page scaffold (bites) ----------------------------------- */
.bite { width: min(640px, calc(100% - 28px)); margin: 0 auto; padding: 22px 0 60px; position: relative; z-index: 1; }
.bite h1 { font: 900 clamp(1.6rem, 5vw, 2.1rem)/1.2 var(--f-display); color: var(--matcha); margin: 2px 0 6px; }
.bite h1 .en { display: block; color: var(--ink-soft); font-size: .72em; font-weight: 800; margin-top: 2px; }
.bite__intro { color: var(--ink-soft); margin: 0 0 16px; }
.bite__goal { display: flex; gap: 10px; align-items: flex-start; padding: 12px 14px; border-radius: var(--r-md); background: var(--matcha-bg); color: var(--matcha); font-size: .92rem; margin: 0 0 18px; }
.bite__goal b { font: 700 10px var(--f-mono); letter-spacing: .12em; text-transform: uppercase; padding-top: 3px; white-space: nowrap; }
.bite section { margin: 22px 0; }
.bite h2 { font: 700 1.15rem var(--f-display); color: var(--ink); display: flex; align-items: center; gap: 10px; }
.bite h2 .idx { width: 26px; height: 26px; display: grid; place-items: center; border-radius: 50%; background: var(--ink); color: #fff; font: 700 12px var(--f-mono); flex: 0 0 auto; }
.bite__end {
  position: relative;
  margin-top: 30px; text-align: center;
  border: 2px solid #e3e9dc; border-radius: var(--r-lg);
  background: linear-gradient(135deg, var(--matcha-bg), #fff 70%);
  padding: 20px 16px 20px 96px;
}
.bite__end::before {
  content: "";
  position: absolute; left: 12px; top: 50%;
  width: 72px; height: 72px;
  transform: translateY(-50%);
  background: url('../assets/collection/ui-encouragement-pencil.webp') center / contain no-repeat;
  pointer-events: none;
}
@media (max-width: 480px) {
  .bite__end { padding: 84px 16px 18px; }
  .bite__end::before { top: 12px; left: 50%; transform: translateX(-50%); }
}
.bite__end p { margin: 0 0 12px; color: var(--ink-soft); font-size: .95rem; }
.bite__end small { display: block; margin-top: 12px; font: 400 10px var(--f-mono); color: var(--muted); }

/* ---- 18. App shell ------------------------------------------------------ */
.app { width: min(960px, calc(100% - 28px)); margin: 0 auto; padding: 18px 0 70px; position: relative; z-index: 1; }
.app__head { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 14px; align-items: end; margin-bottom: 14px; }
.app__head h1 { font: 900 clamp(1.5rem, 4.5vw, 2.2rem)/1.2 var(--f-display); color: var(--ink); margin: 2px 0 4px; }
.app__panel { border: 2px solid var(--ink); border-radius: var(--r-lg); background: rgba(255,255,255,.9); box-shadow: var(--shadow-pop); padding: clamp(16px, 3vw, 28px); }
.app__bar { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 10px; margin-bottom: 14px; }
.app__big { font: 900 clamp(1.8rem, 6vw, 3rem)/1.15 var(--f-en); text-align: center; margin: 14px 0; }
.app__big small { display: block; font: 700 .42em var(--f-jp); color: var(--ink-soft); margin-top: 6px; }
.app__aside { display: grid; gap: 12px; }
@media (max-width: 640px) { .app__head { grid-template-columns: 1fr; } }

/* ---- 19. Motion & print ------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; scroll-behavior: auto !important; }
  .petal, .k-spark { display: none !important; }
}
@media print {
  .k-top, .k-foot, .k-skip, .k-toast, .petal, .k-spark, .say, .mic, .k-cta, .k-az { display: none !important; }
  body { background: #fff; color: #000; }
  .k-card, .bubble, .pattern-card, .quest { box-shadow: none; break-inside: avoid; }
}