/* 01. Minimal reset */
*, *::before, *::after { box-sizing: border-box; }
:where(body,h1,h2,h3,p,ul,ol,figure,blockquote,dl,dd) { margin: 0; }
:where(ul,ol) { padding: 0; list-style: none; }
:where(button,input) { font: inherit; color: inherit; }
:where(button) { cursor: pointer; }
:where(a) { color: inherit; text-decoration: none; }
:where(img) { display: block; max-width: 100%; height: auto; }
:where(button,input,dialog) { border: 0; }
:where([hidden]) { display: none; }

/* 02. Tokens — mobile first; expansion at 480 / 768 / 1024 / 1280px. */
:root {
  --c-cream: #faf8ef; --c-paper: #fffef9; --c-white: #fff;
  --c-ink: #183f34; --c-muted: #53665e; --c-green: #00c399;
  --c-deep: #007652; --c-line: #087e42; --c-mint: #e0f3d8;
  --c-border: #dce3d5; --c-yellow: #ffe879; --c-soft: #f0f1e7;
  --c-error: #9b3e2e; --c-overlay: rgb(18 44 35 / .42);
  --c-lemon-soft: #fff5c4; --c-mint-light: #eff9e8;
  --space-1: .25rem; --space-2: .5rem; --space-3: .75rem; --space-4: 1rem;
  --space-5: 1.25rem; --space-6: 1.5rem; --space-8: 2rem; --space-10: 2.5rem;
  --space-12: 3rem; --space-16: 4rem;
  --space-section: clamp(2.75rem, 7vw, 6rem);
  --space-card: clamp(1.25rem, 3vw, 2rem);
  --radius-sm: .75rem; --radius-md: 1.25rem; --radius-lg: 2rem; --radius-pill: 100vmax;
  --shadow-clay: inset 0 3px 2px rgb(255 255 255 / .95), inset 0 -6px 12px rgb(54 84 49 / .07), 0 6px 0 rgb(39 65 44 / .05), 0 12px 24px rgb(39 65 44 / .07);
  --shadow-button: inset 0 2px 1px rgb(255 255 255 / .22), 0 4px 0 #065e36, 0 8px 16px rgb(8 126 66 / .12);
  --shadow-float: 0 18px 40px rgb(37 79 48 / .1);
  --fs-body: 1rem; --fs-small: .875rem; --fs-card: clamp(1.0625rem, 1.8vw, 1.25rem);
  --fs-title: clamp(1.625rem, 3.5vw, 2.75rem); --fs-hero: clamp(2.625rem, 6vw, 5.25rem);
  --fs-number: clamp(2rem, 4vw, 3.25rem); --width-page: 70rem;
  --header-height: 4.5rem; --tap: 2.75rem; --motion: 280ms;
}
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-height) + var(--space-4)); }
body { background: var(--c-cream); color: var(--c-ink); font-family: "Noto Sans JP", "Yu Gothic", sans-serif; font-size: var(--fs-body); line-height: 1.8; -webkit-font-smoothing: antialiased; }
button { -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 3px solid var(--c-deep); outline-offset: 5px; }
:where(p,li,h1,h2,h3,a,button) { overflow-wrap: anywhere; }
:where(h1,h2,h3) { line-height: 1.5; font-weight: 800; text-wrap: balance; }
:where(section) { scroll-margin-top: var(--space-6); }
.page-shell { width: min(calc(100% - 2rem), var(--width-page)); margin-inline: auto; }
.section { padding-block: var(--space-section); }
.section__head { margin-bottom: var(--space-8); }
.section__eyebrow { display: flex; align-items: center; gap: var(--space-3); color: var(--c-deep); font-size: var(--fs-small); font-weight: 700; letter-spacing: .06em; margin-bottom: var(--space-3); }
.section__eyebrow::before { content: ""; width: 1.5rem; height: 2px; background: currentColor; }
.section__title { font-size: var(--fs-title); letter-spacing: -.035em; }
.section__chunk { display: inline-block; }
.section__intro { color: var(--c-muted); margin-top: var(--space-4); }
.button { display: inline-flex; align-items: center; justify-content: center; gap: var(--space-3); min-height: 3.5rem; padding: var(--space-3) var(--space-5); border-radius: var(--radius-md); font-weight: 700; line-height: 1.6; text-align: center; transition: transform var(--motion), box-shadow var(--motion), background var(--motion); }
.button:hover { transform: translateY(-2px); }
.button:active { transform: translateY(1px); }
.button--primary { color: var(--c-white); background: var(--c-line); box-shadow: var(--shadow-button); }
.button--secondary { background: var(--c-paper); color: var(--c-deep); border: 1px solid var(--c-border); box-shadow: var(--shadow-clay); }
.button--small { min-height: var(--tap); font-size: var(--fs-small); padding: var(--space-2) var(--space-4); }
.button__icon { width: 1.5rem; height: 1.5rem; flex: 0 0 auto; object-fit: contain; }
.button__arrow { margin-left: auto; font-size: 1.25rem; }
.text-link { min-height: var(--tap); display: inline-flex; align-items: center; gap: var(--space-3); background: transparent; text-decoration: underline; text-underline-offset: .3em; font-weight: 700; color: var(--c-deep); }
.skip-link { position: fixed; top: var(--space-3); left: var(--space-4); z-index: 100; padding: var(--space-3); background: var(--c-white); transform: translateY(-180%); }
.skip-link:focus { transform: none; }
.js-control { display: none; }
.has-js .js-control { display: inline-flex; }

/* 03. Header / navigation */
.site-header { position: sticky; top: 0; z-index: 30; background: rgb(250 248 239 / .96); border-bottom: 1px solid var(--c-border); transition: transform var(--motion); backdrop-filter: blur(16px); }
.site-header--away { transform: translateY(-100%); }
.site-header__inner { display: flex; align-items: center; justify-content: space-between; min-height: var(--header-height); gap: var(--space-4); }
.site-header__logo { width: 8rem; padding-block: var(--space-3); flex: 0 0 auto; }
.site-header__desktop { display: none; align-items: center; gap: var(--space-6); font-size: var(--fs-small); font-weight: 700; }
.site-header__desktop a { min-height: var(--tap); display: inline-flex; align-items: center; }
[data-nav][aria-current="location"] { color: var(--c-deep); text-decoration: underline; text-underline-offset: .45em; text-decoration-thickness: 2px; }
.menu-toggle { width: var(--tap); height: var(--tap); display: none; align-items: center; justify-content: center; flex-direction: column; gap: 6px; background: var(--c-paper); border-radius: var(--radius-sm); border: 1px solid var(--c-border); }
.has-js .menu-toggle { display: flex; }
.menu-toggle__line { width: 20px; height: 2px; background: var(--c-ink); transition: transform var(--motion); }
.menu-toggle[aria-expanded="true"] .menu-toggle__line:first-child { transform: translateY(4px) rotate(45deg); }
.menu-toggle[aria-expanded="true"] .menu-toggle__line:last-child { transform: translateY(-4px) rotate(-45deg); }
.site-header__progress { position: absolute; bottom: -1px; left: 0; height: 2px; width: 100%; background: var(--c-green); transform: scaleX(0); transform-origin: left; }
.fallback-nav { display: flex; flex-wrap: wrap; gap: var(--space-4); padding: var(--space-4); }
.drawer { position: fixed; inset: 0; width: 100%; max-width: none; height: 100%; max-height: none; padding: 0; margin: 0; background: transparent; color: var(--c-ink); overflow: hidden; }
.drawer::backdrop { background: var(--c-overlay); opacity: 0; transition: opacity var(--motion); }
.drawer--open::backdrop { opacity: 1; }
.drawer__panel { margin-left: auto; width: min(100%, 27rem); height: 100%; overflow-y: auto; overscroll-behavior: contain; padding: var(--space-5); background: var(--c-cream); transform: translateX(100%); transition: transform var(--motion); }
.drawer--open .drawer__panel { transform: translateX(0); }
.drawer__head { display: flex; justify-content: space-between; align-items: center; margin-bottom: var(--space-5); }
.drawer__close, .quiz__close { width: var(--tap); height: var(--tap); border-radius: var(--radius-pill); background: var(--c-soft); font-size: 1.5rem; }
.drawer__nav { display: grid; }
.drawer__nav a { padding: var(--space-3) var(--space-2); border-bottom: 1px solid var(--c-border); font-weight: 700; }
.drawer__nav a::after { content: "↗"; float: right; color: var(--c-deep); }
.drawer__guide { display: flex; align-items: center; justify-content: center; gap: var(--space-4); margin-block: var(--space-5); }
.drawer__guide img { width: 5rem; height: 5rem; object-fit: contain; }
.drawer__cta { display: flex; }
.drawer__links { display: flex; gap: var(--space-6); flex-wrap: wrap; margin-top: var(--space-4); }

/* 04. Hero — mascot, clear offer, one main action */
.numbers { background: var(--c-paper); border-block: 1px solid var(--c-border); }
.numbers__grid { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); padding-block: var(--space-5); row-gap: var(--space-5); text-align: center; }
.numbers__item:nth-child(even) { border-left: 1px solid var(--c-border); }
.numbers__value { display: block; font-size: var(--fs-number); font-weight: 800; line-height: 1.2; letter-spacing: -.035em; }
.numbers__value small { font-size: var(--fs-body); letter-spacing: 0; }
.numbers__label { display: block; color: var(--c-muted); font-size: var(--fs-small); margin-top: var(--space-2); }

/* 05. Empathy */
.worries__grid { display: grid; gap: var(--space-4); }
.worry { display: grid; grid-template-columns: 4rem minmax(0,1fr); gap: var(--space-4); align-items: center; padding: var(--space-5); border-radius: var(--radius-md); background: var(--c-paper); box-shadow: var(--shadow-clay); border: 1px solid var(--c-border); }
.worry__image { width: 4rem; height: 4.5rem; object-fit: contain; }
.worry__title { font-size: var(--fs-card); margin-bottom: var(--space-2); }
.worry__text { color: var(--c-muted); }
.guide { display: flex; justify-content: center; align-items: center; gap: var(--space-4); margin-top: var(--space-8); }
.guide__mascot { width: 4.75rem; height: 4.75rem; object-fit: contain; }
.guide__speech { font-weight: 700; line-height: 1.6; }
.guide__speech span { display: inline-block; }
/* Manamon narrates each topic. Supplied poses stay unchanged. */
.narrator { display: flex; align-items: center; gap: var(--space-4); margin-block: var(--space-5); }
.narrator__character { flex: 0 0 auto; width: 4.5rem; height: 5rem; object-fit: contain; }
.narrator__bubble { position: relative; min-width: 0; padding: var(--space-3) var(--space-4); border-radius: var(--radius-md); background: var(--c-paper); border: 1px solid var(--c-border); box-shadow: var(--shadow-clay); font-weight: 600; }
.narrator__bubble::before { content: ""; position: absolute; left: -.4rem; top: 40%; width: .7rem; height: .7rem; background: var(--c-paper); border-left: 1px solid var(--c-border); border-bottom: 1px solid var(--c-border); transform: rotate(45deg); }
.narrator--intro { margin-block: 0 var(--space-6); }
.narrator--intro .narrator__character { width: 3.5rem; height: 4rem; }
.narrator--intro .narrator__bubble { flex: 1; padding: var(--space-3); }
.narrator--intro .section__eyebrow { margin-bottom: var(--space-2); }
.narrator--intro .section__title { font-size: clamp(1.3125rem, 3.2vw, 2.5rem); }
.benefit__mascot { width: 3rem; height: 3rem; object-fit: contain; }
.step__mascot { width: 3rem; height: 3rem; object-fit: contain; margin-top: var(--space-3); }
.scene__caption { position: relative; padding-right: 2.5rem; }
.scene__mascot { position: absolute; right: 0; top: 0; width: 2rem; height: 2.5rem; object-fit: contain; }
.word-demo__guide { margin-block: var(--space-4) 0; }
.word-demo__guide .narrator__character { width: 3.25rem; height: 3.75rem; }
.word-demo__guide .narrator__bubble { padding: var(--space-2) var(--space-3); font-size: var(--fs-small); }
.quiz__guide { margin-block: var(--space-4) 0; }
.quiz__guide .narrator__character { width: 3.5rem; height: 3.5rem; }
.quiz__guide .narrator__bubble { font-size: var(--fs-small); }

/* 06. Randomized learning / benefits */
.strength { background: var(--c-mint); border-radius: var(--radius-lg) var(--radius-lg) 0 0; }
.strength__feature { display: grid; gap: var(--space-6); align-items: center; }
.strength__copy p { margin-top: var(--space-4); }
.strength__copy strong { background: linear-gradient(transparent 65%, var(--c-yellow) 65%); }
.strength__note { font-weight: 700; }
.math-demo { padding: var(--space-card); background: var(--c-paper); border: 1px solid var(--c-white); border-radius: var(--radius-lg); box-shadow: var(--shadow-clay); }
.math-demo__top { display: flex; justify-content: space-between; gap: var(--space-3); font-size: var(--fs-small); color: var(--c-muted); }
.math-demo__tag { color: var(--c-deep); font-weight: 700; }
.math-demo__previous { text-align: center; font-size: 1.375rem; color: var(--c-muted); margin-top: var(--space-5); }
.math-demo__direction { display: block; text-align: center; color: var(--c-deep); font-size: var(--fs-small); margin-block: var(--space-2); }
.math-demo__formula { text-align: center; background: var(--c-soft); border: 1px solid var(--c-border); border-radius: var(--radius-md); padding: var(--space-5) var(--space-2); font-weight: 800; font-size: clamp(1.75rem, 4vw, 2.75rem); line-height: 1.5; font-variant-numeric: tabular-nums; letter-spacing: .02em; }
.math-demo__formula b { color: var(--c-deep); }
.math-demo__controls { display: flex; flex-wrap: wrap; justify-content: center; gap: var(--space-3); margin-top: var(--space-5); }
.math-demo__caption { font-size: var(--fs-small); text-align: center; color: var(--c-muted); margin-top: var(--space-4); }
.math-demo__caption--interactive { display: none; }
.has-js .math-demo__caption--interactive { display: block; }
.benefits { display: grid; gap: var(--space-4); margin-top: var(--space-8); }
.benefit { display: grid; grid-template-columns: 3rem minmax(0,1fr); align-items: start; gap: var(--space-3); padding: var(--space-5); background: rgb(255 254 249 / .8); border-radius: var(--radius-md); border: 1px solid rgb(255 255 255 / .8); }
.benefit__number { display: grid; place-items: center; width: 2.5rem; height: 2.5rem; background: var(--c-paper); border: 1px solid var(--c-border); border-radius: var(--radius-sm); font-size: var(--fs-small); font-weight: 800; color: var(--c-deep); box-shadow: var(--shadow-clay); }
.benefit__title { font-size: var(--fs-card); margin-bottom: var(--space-2); }
.benefit__text { color: var(--c-muted); }
.strength__cta { margin-top: var(--space-8); display: grid; justify-items: center; gap: var(--space-4); text-align: center; }

/* 07. Start / daily scenes */
.steps { display: grid; gap: var(--space-5); }
.step { display: grid; grid-template-columns: 3rem minmax(0,1fr); gap: var(--space-4); padding-bottom: var(--space-5); border-bottom: 1px solid var(--c-border); }
.step__number { width: 3rem; height: 3rem; display: grid; place-items: center; border-radius: var(--radius-pill); background: var(--c-mint); font-size: 1.25rem; font-weight: 800; box-shadow: var(--shadow-clay); }
.step__title { font-size: var(--fs-card); margin-bottom: var(--space-2); }
.step__text { color: var(--c-muted); }
.daily { padding-top: 0; }
.daily__grid { display: grid; gap: var(--space-4); }
.scene { display: grid; grid-template-columns: 6rem minmax(0,1fr); gap: var(--space-4); align-items: center; }
.scene__image { width: 100%; height: 5.5rem; object-fit: cover; border-radius: var(--radius-sm); }
.scene__caption { font-weight: 700; }
.scene__caption span { display: block; font-size: var(--fs-small); color: var(--c-muted); font-weight: 400; }

/* 08. Word cards */
.words { background: var(--c-paper); border-block: 1px solid var(--c-border); }
.words__layout { display: grid; gap: var(--space-8); align-items: center; }
.words__tag { display: inline-block; background: var(--c-yellow); border-radius: var(--radius-pill); padding: var(--space-1) var(--space-3); font-size: var(--fs-small); font-weight: 700; margin-bottom: var(--space-4); }
.words__list { display: grid; gap: var(--space-3); margin-top: var(--space-5); }
.words__list li { display: grid; grid-template-columns: 1.25rem minmax(0,1fr); gap: var(--space-2); }
.words__list li::before { content: "✓"; color: var(--c-deep); font-weight: 800; }
.words__note { font-size: var(--fs-small); color: var(--c-muted); margin-top: var(--space-6); }
.word-demo { min-width: 0; padding: var(--space-5); background: var(--c-cream); border: 1px solid var(--c-border); border-radius: var(--radius-lg); box-shadow: var(--shadow-clay); }
.word-demo__head { display: flex; align-items: center; justify-content: space-between; gap: var(--space-2); margin-bottom: var(--space-4); }
.word-demo__label { font-size: var(--fs-small); font-weight: 700; }
.word-card { position: relative; width: 100%; display: block; height: 14rem; padding: 0; background: transparent; perspective: 1000px; border-radius: var(--radius-md); }
.word-card__inner { display: block; width: 100%; height: 100%; position: relative; transition: transform 450ms; transform-style: preserve-3d; }
.word-card[aria-pressed="true"] .word-card__inner { transform: rotateY(180deg); }
.word-card__face { position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; padding: var(--space-4); background: var(--c-white); border: 1px solid var(--c-border); border-radius: var(--radius-md); box-shadow: var(--shadow-clay); backface-visibility: hidden; }
.word-card__face--back { transform: rotateY(180deg); background: var(--c-mint); }
.word-card__word { font-family: Arial,sans-serif; font-size: clamp(2rem, 9vw, 2.75rem); font-weight: 700; letter-spacing: -.03em; }
.word-card__hint { margin-top: var(--space-4); font-size: var(--fs-small); color: var(--c-muted); }
.word-card__meaning { font-size: 1.75rem; font-weight: 800; }
.word-card__example { margin-top: var(--space-3); font-size: var(--fs-body); }
.word-demo__controls { display: flex; justify-content: space-between; align-items: center; gap: var(--space-2); margin-top: var(--space-4); }
.word-demo__count { font-size: var(--fs-small); font-variant-numeric: tabular-nums; }
.word-demo__static { padding: var(--space-4); }
.word-demo__interactive { display: none; }
.has-js .word-demo__interactive { display: block; }
.has-js .word-demo__static { display: none; }

/* 09. Teacher / final conversion */
.teacher__card { display: grid; gap: var(--space-6); align-items: center; }
.teacher__portrait { display: flex; align-items: center; gap: var(--space-4); }
.teacher__photo { width: 6rem; height: 6rem; border-radius: var(--radius-pill); object-fit: cover; background: var(--c-mint); }
.teacher__name { font-size: 1.25rem; font-weight: 800; }
.teacher__subjects { color: var(--c-muted); font-size: var(--fs-small); text-wrap: balance; }
.teacher__quote { font-size: clamp(1.25rem,2.2vw,1.75rem); font-weight: 800; line-height: 1.65; margin-bottom: var(--space-4); }
.teacher__message { color: var(--c-muted); }
.final-cta { padding-top: 0; }
.final-cta__panel { position: relative; padding: var(--space-8) var(--space-5); border: 1px solid var(--c-border); border-radius: var(--radius-lg); background: var(--c-mint); box-shadow: var(--shadow-clay); display: grid; justify-items: center; text-align: center; }
.final-cta__mascot { width: 6rem; height: 6rem; object-fit: contain; margin-bottom: var(--space-3); }
.final-cta__title { font-size: var(--fs-title); }
.final-cta__price { display: flex; justify-content: center; align-items: baseline; flex-wrap: wrap; gap: var(--space-3); margin-block: var(--space-4); }
.final-cta__normal { font-size: var(--fs-body); }
.final-cta__free { color: var(--c-deep); font-size: 3.5rem; font-weight: 900; line-height: 1.2; }
.final-cta__free small { font-size: 1.5rem; }
.final-cta__button { width: min(100%,25rem); margin-block: var(--space-3) var(--space-5); }
.final-cta__note { font-size: var(--fs-small); color: var(--c-muted); }
.site-footer { padding-block: var(--space-8) calc(6rem + env(safe-area-inset-bottom)); background: var(--c-paper); border-top: 1px solid var(--c-border); }
.site-footer__top { display: grid; gap: var(--space-5); }
.site-footer__logo { width: 8rem; }
.site-footer__nav { display: flex; flex-wrap: wrap; gap: var(--space-2) var(--space-5); }
.site-footer__nav a { display: inline-flex; align-items: center; min-height: var(--tap); font-size: var(--fs-small); }
.site-footer__legal { display: flex; flex-wrap: wrap; gap: var(--space-2) var(--space-5); margin-top: var(--space-5); border-top: 1px solid var(--c-border); padding-top: var(--space-4); color: var(--c-muted); }
.site-footer__legal a { display: inline-flex; align-items: center; min-height: var(--tap); font-size: var(--fs-small); }
.site-footer__copyright { margin-top: var(--space-4); font-size: var(--fs-small); color: var(--c-muted); }
.sticky-cta { position: fixed; bottom: 0; left: 0; width: 100%; z-index: 25; display: none; padding: var(--space-3) max(var(--space-4),env(safe-area-inset-right)) calc(var(--space-3) + env(safe-area-inset-bottom)) max(var(--space-4),env(safe-area-inset-left)); background: rgb(250 248 239 / .96); border-top: 1px solid var(--c-border); backdrop-filter: blur(12px); transform: translateY(110%); visibility: hidden; transition: transform var(--motion), visibility var(--motion); }
.has-js .sticky-cta { display: block; }
.sticky-cta--visible { transform: translateY(0); visibility: visible; }
.sticky-cta__button { display: flex; min-height: 3rem; font-size: var(--fs-body); }
.sticky-cta__button small { font-size: var(--fs-small); font-weight: 500; }

/* 10. In-page sample quiz */
.quiz { width: min(calc(100% - 2rem),30rem); max-height: calc(100dvh - 2rem); margin: auto; padding: var(--space-6); border-radius: var(--radius-lg); color: var(--c-ink); background: var(--c-cream); overscroll-behavior: contain; }
.quiz::backdrop { background: var(--c-overlay); backdrop-filter: blur(4px); }
.quiz__head { display: flex; justify-content: space-between; align-items: start; gap: var(--space-3); }
.quiz__title { font-size: clamp(1.125rem, 4vw, 1.375rem); }
.quiz__close { flex: 0 0 auto; }
.quiz__eyebrow { font-size: var(--fs-small); color: var(--c-deep); font-weight: 700; }
.quiz__equation { font-size: 2.5rem; font-weight: 800; text-align: center; padding: var(--space-6) 0; }
.quiz__label { display: block; font-weight: 700; margin-bottom: var(--space-2); }
.quiz__row { display: flex; gap: var(--space-3); align-items: center; }
.quiz__input { min-width: 0; width: 100%; min-height: 3.5rem; padding: var(--space-3); background: var(--c-white); border: 1px solid var(--c-border); border-radius: var(--radius-sm); }
.quiz__submit { flex-shrink: 0; }
.quiz__feedback { margin-top: var(--space-5); font-weight: 700; color: var(--c-deep); }
.quiz__feedback--retry { color: var(--c-error); }
.quiz__explanation { background: var(--c-paper); border: 1px solid var(--c-border); padding: var(--space-4); border-radius: var(--radius-md); margin-block: var(--space-4); }
.quiz__explanation p + p { margin-top: var(--space-3); }
.quiz__footer { display: grid; gap: var(--space-3); margin-top: var(--space-5); }

/* 11. Character-led art direction and progressive motion.
   Surfaces remain visible before, during and without animation. */
.numbers__item { position: relative; }
.numbers__value { color: var(--c-deep); }
.numbers__value small { color: var(--c-ink); }
.numbers__item:nth-child(2) .numbers__value { display: inline-block; background: linear-gradient(transparent 68%,var(--c-yellow) 68%); }
.worries { position: relative; }
.worry { position: relative; border-color: #e8dfc3; background: linear-gradient(150deg,var(--c-paper),#fff9e6); border-radius: var(--radius-lg) var(--radius-lg) var(--radius-lg) var(--space-2); }
.worry__image { filter: drop-shadow(0 5px 0 rgb(72 57 16 / .05)); }
.worry__title { color: #664a26; }
.worry:nth-child(2) { border-radius: var(--radius-lg) var(--radius-lg) var(--space-2) var(--radius-lg); }
.guide__speech { padding: var(--space-4) var(--space-5); background: var(--c-white); border: 1px solid var(--c-border); border-radius: var(--radius-lg); box-shadow: var(--shadow-clay); }
.strength { position: relative; background: linear-gradient(150deg,#eaf7dc 0%,#d8edc8 100%); border-top: 4px solid var(--c-paper); }
.strength::before { content: ""; position: absolute; top: -1.125rem; left: calc(50% - 1rem); width: 2rem; height: 2rem; background: var(--c-cream); border-radius: 0 0 var(--radius-sm) 0; transform: rotate(45deg); }
.strength__copy .section__eyebrow { display: inline-flex; background: var(--c-ink); color: var(--c-white); padding: var(--space-2) var(--space-4); border-radius: var(--radius-pill); }
.math-demo { position: relative; transform: rotate(1deg); border: 2px solid var(--c-white); border-radius: var(--radius-md) var(--radius-lg) var(--radius-lg) var(--radius-md); box-shadow: 5px 7px 0 #c0d9ad, 9px 12px 0 rgb(255 255 255 / .6), var(--shadow-float); background-image: repeating-linear-gradient(transparent 0,transparent 27px,rgb(93 134 92 / .1) 27px,rgb(93 134 92 / .1) 28px); }
.math-demo::before { content: ""; position: absolute; width: 4rem; height: 1rem; left: calc(50% - 2rem); top: -.6rem; background: rgb(255 232 121 / .85); transform: rotate(-5deg); border-inline: 2px dashed rgb(181 148 22 / .25); }
.math-demo__previous { text-decoration: line-through; text-decoration-color: var(--c-border); }
.math-demo__formula { background: var(--c-paper); box-shadow: inset 0 2px 6px rgb(30 85 45 / .06); }
.math-demo__formula b { padding-inline: var(--space-1); border-radius: var(--space-2); background: var(--c-lemon-soft); }
.benefit { border: 2px solid var(--c-paper); box-shadow: var(--shadow-clay); transition: transform var(--motion),box-shadow var(--motion); }
.benefit:nth-child(3n+2) { background: var(--c-lemon-soft); }
.benefit:nth-child(3n+3) { background: var(--c-mint-light); }
.benefit__mascot { width: 3rem; height: 3.5rem; filter: drop-shadow(0 5px 3px rgb(37 79 48 / .1)); }
.benefit__title { position: relative; padding-bottom: var(--space-2); }
.benefit__title::after { content: ""; position: absolute; width: 1.5rem; height: 3px; bottom: 0; left: 0; background: var(--c-green); border-radius: var(--radius-pill); }
.step { position: relative; border: 1px solid var(--c-border); border-radius: var(--radius-lg); padding: var(--space-5); background: var(--c-paper); box-shadow: var(--shadow-clay); }
.step__number { color: var(--c-deep); border: 2px solid var(--c-white); }
.step:nth-child(2) .step__number { background: var(--c-yellow); }
.step__mascot { filter: drop-shadow(0 4px 2px rgb(37 79 48 / .08)); }
.step__title { font-weight: 800; }
.daily__grid { padding: var(--space-5); border-radius: var(--radius-lg); background: var(--c-lemon-soft); border: 1px solid #eee3b2; box-shadow: inset 0 3px 0 var(--c-paper); }
.scene__image { border: 4px solid var(--c-paper); box-shadow: 0 4px 8px rgb(69 60 29 / .12); transition: transform 400ms; }
.scene:nth-child(2) .scene__image { transform: rotate(2deg); }
.words { position: relative; background: radial-gradient(ellipse at 85% 50%,#eef7dd,transparent 60%),var(--c-paper); }
.word-demo { position: relative; background: #f0f4e5; box-shadow: 0 7px 0 #dce6cb, var(--shadow-float); border: 2px solid var(--c-white); }
.word-demo__head { margin-top: var(--space-4); }
.word-card::before, .word-card::after { content: ""; position: absolute; inset: 0; border: 1px solid var(--c-border); background: var(--c-mint); border-radius: var(--radius-md); transform: rotate(-3deg); box-shadow: 0 3px 5px rgb(30 60 40 / .06); }
.word-card::after { transform: rotate(3deg); background: var(--c-lemon-soft); }
.word-card__inner { z-index: 1; }
.word-card__face::before { content: ""; width: 2rem; height: 3px; border-radius: var(--radius-pill); background: var(--c-green); position: absolute; top: var(--space-4); }
.word-demo__controls { margin-top: var(--space-5); }
.teacher__card { padding: var(--space-card); background: var(--c-paper); border: 1px solid var(--c-border); border-radius: var(--radius-lg); box-shadow: var(--shadow-clay); }
.teacher__photo { border: 5px solid var(--c-white); box-shadow: 4px 5px 0 var(--c-mint); border-radius: 44% 48% 42% 46%; }
.teacher__quote { position: relative; padding-left: var(--space-4); border-left: 4px solid var(--c-green); }
.final-cta__panel { background: radial-gradient(ellipse at 50% 20%,#f4fbd7,#d8eec4); border: 3px solid var(--c-paper); box-shadow: 0 7px 0 var(--c-border),var(--shadow-clay); }
.final-cta__panel::before, .final-cta__panel::after { content: ""; position: absolute; width: 3rem; height: 4rem; background: url("../img/final-cta_deco.svg") center / contain no-repeat; pointer-events: none; }
.final-cta__panel::before { left: var(--space-4); top: var(--space-4); transform: rotate(-12deg); }
.final-cta__panel::after { right: var(--space-4); top: var(--space-8); transform: rotate(12deg); }
.final-cta__price { padding: var(--space-3) var(--space-5); border-radius: var(--radius-md); background: rgb(255 255 255 / .7); box-shadow: inset 0 2px 0 var(--c-white); }
.final-cta__free { display: inline-block; transform: rotate(-5deg); }
.quiz__explanation { border-left: 4px solid var(--c-green); }
.quiz__feedback--retry { background: var(--c-lemon-soft); padding: var(--space-3); border-radius: var(--radius-sm); }
.scene__mascot, .narrator__character, .step__mascot, .guide__mascot, .benefit__mascot { transform-origin: center bottom; transition: transform var(--motion); }
@media (hover:hover) {
  .benefit:hover { transform: translateY(-5px); box-shadow: 0 12px 22px rgb(39 65 44 / .12); }
  .benefit:hover .benefit__mascot, .step:hover .step__mascot { transform: rotate(-8deg) translateY(-4px); }
  .narrator:hover .narrator__character, .scene:hover .scene__mascot { transform: rotate(7deg); }
  .scene:hover .scene__image { transform: rotate(-1deg) translateY(-3px); }
}
.motion-arrive { animation: surface-arrive 650ms cubic-bezier(.2,.7,.2,1) both; }
.motion-arrive .narrator__character, .motion-arrive .guide__mascot { animation: mascot-hop 800ms ease-out; }
.motion-arrive .narrator__bubble { animation: bubble-settle 650ms ease-out; transform-origin: left center; }
.motion-arrive.benefit .benefit__mascot { animation: mascot-nod 650ms ease-out; }
.drawer--open .drawer__nav a { animation: drawer-link 450ms ease-out both; }
.drawer--open .drawer__nav a:nth-child(2n) { animation-duration: 550ms; }
.quiz--correct .quiz__guide .narrator__character { animation: mascot-hop 700ms ease-out; }
.quiz--correct .quiz__feedback { animation: bubble-settle 350ms ease-out; }
@keyframes surface-arrive { from { transform: translateY(16px); } to { transform: translateY(0); } }
@keyframes bubble-settle { 0% { transform: scale(.96) rotate(-1deg); } 60% { transform: scale(1.015); } 100% { transform: scale(1) rotate(0); } }
@keyframes mascot-hop { 0%,100% { transform: translateY(0) rotate(0); } 35% { transform: translateY(-12px) rotate(-7deg); } 65% { transform: translateY(-4px) rotate(4deg); } }
@keyframes mascot-nod { 0%,100% { transform: rotate(0); } 35% { transform: rotate(-9deg); } 70% { transform: rotate(6deg); } }
@keyframes drawer-link { from { transform: translateX(18px); } to { transform: translateX(0); } }

/* 12. Responsive expansion */
@media (min-width: 30rem) {
  .benefits { grid-template-columns: repeat(2,minmax(0,1fr)); }
}
@media (min-width: 48rem) {
  .numbers__grid { grid-template-columns: repeat(4,minmax(0,1fr)); padding-block: var(--space-6); }
  .numbers__item + .numbers__item { border-left: 1px solid var(--c-border); }
  .worries__grid { grid-template-columns: repeat(3,minmax(0,1fr)); }
  .worry { display: block; padding: var(--space-6); }
  .worry__image { width: 5rem; height: 5rem; margin-bottom: var(--space-4); }
  .strength__feature, .words__layout { grid-template-columns: 1fr 1fr; gap: var(--space-10); }
  .steps { grid-template-columns: repeat(3,minmax(0,1fr)); gap: var(--space-6); }
  .step { display: block; padding: var(--space-6); }
  .step + .step::before { content: "→"; position: absolute; left: -1.25rem; top: 2.5rem; width: 2.5rem; height: 2.5rem; border-radius: 50%; text-align: center; background: var(--c-yellow); z-index: 1; border: 3px solid var(--c-cream); color: var(--c-deep); font-weight: 800; line-height: 2rem; }
  .step__number { margin-bottom: var(--space-4); }
  .step__visual { display: flex; align-items: center; gap: var(--space-4); margin-bottom: var(--space-4); }
  .step__visual .step__number { margin: 0; }
  .step__mascot { margin: 0; width: 4rem; height: 4rem; }
  .narrator--intro { gap: var(--space-6); }
  .narrator--intro .narrator__character { width: 6.5rem; height: 7rem; }
  .narrator--intro .narrator__bubble { padding: var(--space-5) var(--space-6); }
  .daily__grid { grid-template-columns: repeat(3,minmax(0,1fr)); gap: var(--space-6); }
  .scene { display: block; }
  .scene__image { height: 10rem; border-radius: var(--radius-md); margin-bottom: var(--space-3); }
  .scene:first-child .scene__image { transform: rotate(-2deg); }
  .daily__grid { padding: var(--space-8); }
  .teacher__card { grid-template-columns: 15rem 1fr; gap: var(--space-12); }
  .teacher__portrait { flex-direction: column; text-align: center; }
  .teacher__photo { width: 12rem; height: 12rem; }
  .final-cta__panel { padding: var(--space-12); }
  .final-cta__mascot { position: absolute; width: 9rem; height: 9rem; left: var(--space-5); bottom: var(--space-8); }
  .final-cta__panel::before, .final-cta__panel::after { width: 5rem; height: 6rem; }
  .site-footer { padding-bottom: var(--space-8); }
  .site-footer__top { display: flex; justify-content: space-between; align-items: center; gap: var(--space-8); }
  .has-js .sticky-cta { display: none; }
}
@media (min-width: 64rem) {
  .site-header__desktop { display: flex; }
  .has-js .menu-toggle { display: none; }
  .benefits { grid-template-columns: repeat(3,minmax(0,1fr)); }
  .strength__feature { gap: var(--space-16); }
  .worry:nth-child(1) { transform: rotate(-1deg); }
  .worry:nth-child(3) { transform: rotate(1deg); }
  .final-cta__mascot { left: var(--space-16); width: 11rem; height: 11rem; }
}
/* First viewport: full-area photo, one readable content surface, one mascot guide. */
.hero { padding-block: var(--space-4) var(--space-6); background-color: var(--c-cream); background-image: linear-gradient(180deg,transparent 15%,rgb(250 248 239 / .15) 45%,var(--c-cream) 100%),url("../img/hero_bg_sp.webp"); background-repeat: no-repeat; background-position: center top, center -4.5rem; background-size: cover; }
.hero__layout { display: grid; gap: var(--space-3); }
.hero__art { position: relative; height: 10rem; }
.hero__mascot { position: absolute; width: 6.5rem; height: 7rem; object-fit: contain; right: 0; bottom: 0; filter: drop-shadow(0 8px 6px rgb(32 81 51 / .12)); animation: hello 1.1s ease-out 1; }
.hero__speech { position: absolute; right: 0; top: 0; padding: var(--space-2) var(--space-3); color: var(--c-ink); background: var(--c-paper); border: 1px solid var(--c-border); border-radius: var(--radius-md) var(--radius-md) var(--space-1) var(--radius-md); box-shadow: var(--shadow-clay); font-size: var(--fs-small); font-weight: 700; line-height: 1.5; }
.hero__content { min-width: 0; padding: var(--space-5); background: rgb(255 254 249 / .97); border: 1px solid var(--c-white); border-radius: var(--radius-lg); box-shadow: var(--shadow-float); }
.hero__eyebrow { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-2); margin-bottom: var(--space-4); font-size: var(--fs-small); font-weight: 700; color: var(--c-deep); line-height: 1.7; }
.hero__eyebrow span { padding: var(--space-1) var(--space-2); background: var(--c-mint); border-radius: var(--radius-pill); }
.hero__title { font-size: clamp(2.25rem,11vw,3.5rem); line-height: 1.25; font-weight: 900; letter-spacing: -.055em; }
.hero__title span { display: block; }
.hero__title em { color: var(--c-deep); font-style: normal; }
.hero__lead { margin-top: var(--space-5); font-weight: 600; line-height: 1.8; }
.hero__price { font-size: clamp(1.75rem,4vw,2.25rem); font-weight: 800; color: var(--c-deep); }
.hero__price small { font-size: var(--fs-body); font-weight: 500; }
.hero__actions { display: grid; gap: var(--space-3); margin-top: var(--space-5); }
.hero__actions .button { width: 100%; }
.hero__actions .button--secondary { min-height: var(--tap); background: transparent; border-color: transparent; box-shadow: none; }
.hero__reassurance { color: var(--c-muted); font-size: var(--fs-small); line-height: 1.8; }
.hero__reassurance span { display: block; }
@media (min-width: 30rem) {
  .hero__art { height: 13rem; }
  .hero__mascot { width: 8rem; height: 9rem; }
  .hero__content { padding: var(--space-8); }
}
@media (min-width: 48rem) {
  .hero { padding-block: clamp(2.5rem,5vw,4rem); background-image: linear-gradient(90deg,transparent 25%,rgb(250 248 239 / .15) 55%,rgb(250 248 239 / .4) 100%),url("../img/hero_bg_pc.webp"); background-position: center; }
  .hero__layout { grid-template-columns: minmax(0,1fr) minmax(0,1.08fr); align-items: end; gap: var(--space-8); }
  .hero__art { height: 14rem; }
  .hero__mascot { width: 10rem; height: 11rem; right: var(--space-4); bottom: 0; }
  .hero__speech { right: var(--space-4); top: 0; }
  .hero__content { padding: clamp(1.75rem,3vw,2.75rem); }
  .hero__title { font-size: clamp(2.625rem,5.4vw,4.5rem); }
  .hero__eyebrow { font-size: var(--fs-small); }
}
@media (min-width: 64rem) {
  .hero__mascot { width: 12rem; height: 13rem; right: var(--space-6); }
  .hero__art { height: 18rem; }
  .hero__speech { right: var(--space-6); font-size: var(--fs-body); padding: var(--space-3) var(--space-4); }
}
@keyframes hello { 0%,100% { transform: translateY(0) rotate(0); } 45% { transform: translateY(-10px) rotate(-4deg); } }
@keyframes number-pop { 0% { transform: translateY(4px); } 100% { transform: translateY(0); } }
.math-demo__formula--changed { animation: number-pop var(--motion) ease-out; }
/* Never hide content for reveal effects. All reading content is visible without JS/observers. */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none; transition: none; }
  :is(.hero__mascot, .math-demo__formula--changed, .motion-arrive, .motion-arrive .narrator__character, .motion-arrive .guide__mascot, .motion-arrive .narrator__bubble, .motion-arrive.benefit .benefit__mascot, .drawer--open .drawer__nav a, .quiz--correct .quiz__guide .narrator__character, .quiz--correct .quiz__feedback, .hero__art:hover .hero__mascot) { animation: none; }
  :is(.button,.site-header,.menu-toggle__line,.drawer__panel,.word-card__inner,.sticky-cta,.benefit,.scene__image,.scene__mascot,.narrator__character,.step__mascot,.guide__mascot,.benefit__mascot) { transition: none; }
  .drawer::backdrop { transition: none; }
}