/* =========================================================
   SNS集客の一日教室 ─ 藍と朱、紙とペンのデザイン
   Type   : Shippori Mincho / Zen Kaku Gothic New / Klee One
   Tech   : oklch() + fallback, scroll-driven animations,
            :has(), container queries, vertical writing,
            ::details-content + interpolate-size
   ========================================================= */

/* ---------- tokens ---------- */
:root {
  /* hex fallback */
  --paper:      #FAF9F4;
  --paper-2:    #F0EDE4;
  --paper-line: #DDD8C9;
  --ink:        #29271F;
  --ink-soft:   #6B675C;
  --ai:         #24406B;   /* 藍 */
  --ai-deep:    #152540;
  --ai-soft:    #DCE4EF;
  --shu:        #C93A2B;   /* 朱＝赤ペン専用 */
  --shu-light:  #FF9C86;

  --font-min: "Shippori Mincho", "Hiragino Mincho ProN", "Yu Mincho", serif;
  --font-got: "Zen Kaku Gothic New", "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
  --font-hand: "Klee One", "Yu Mincho", cursive;

  --w-container: 1080px;
  --radius: 6px;
  --shadow-paper: 0 1px 2px rgba(41, 39, 31, .08), 0 12px 32px -12px rgba(41, 39, 31, .22);

  interpolate-size: allow-keywords; /* details開閉のheightアニメ用 */
  scrollbar-gutter: stable;
}

/* 対応ブラウザでは oklch で再定義（広色域・知覚均等） */
@supports (color: oklch(50% 0.1 200)) {
  :root {
    --paper:      oklch(98.2% 0.006 95);
    --paper-2:    oklch(94.8% 0.012 95);
    --paper-line: oklch(87.5% 0.02 95);
    --ink:        oklch(26% 0.012 95);
    --ink-soft:   oklch(50% 0.015 95);
    --ai:         oklch(37% 0.085 262);
    --ai-deep:    oklch(24.5% 0.058 262);
    --ai-soft:    oklch(91% 0.024 262);
    --shu:        oklch(53% 0.17 32);
    --shu-light:  oklch(78% 0.12 32);
  }
}

/* ---------- base ---------- */
*, *::before, *::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-got);
  font-size: 1rem;
  line-height: 1.9;
  letter-spacing: 0.02em;
  font-feature-settings: "palt" 1;
  line-break: strict;
  overflow-wrap: anywhere;
}

/* 紙の質感（ごく薄いノイズ） */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: .5;
  background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="240" height="240"><filter id="n"><feTurbulence type="fractalNoise" baseFrequency="0.9" numOctaves="2"/><feColorMatrix values="0 0 0 0 0.2 0 0 0 0 0.19 0 0 0 0 0.15 0 0 0 0.05 0"/></filter><rect width="240" height="240" filter="url(%23n)"/></svg>');
}

main, .site-head, .footer, .demo-banner { position: relative; z-index: 1; }

img { max-width: 100%; height: auto; display: block; }

h1, h2, h3 {
  font-family: var(--font-min);
  font-weight: 600;
  line-height: 1.5;
  margin: 0;
  text-wrap: balance;
}

p { margin: 0; text-wrap: pretty; }
ul, ol, dl, dd, dt, figure, blockquote { margin: 0; padding: 0; }
li { list-style: none; }

a { color: var(--ai); text-underline-offset: .25em; }

::selection { background: var(--ai-soft); color: var(--ai-deep); }

:focus-visible {
  outline: 3px solid var(--ai);
  outline-offset: 3px;
  border-radius: 2px;
}

.container {
  width: min(var(--w-container), 100% - 3rem);
  margin-inline: auto;
}

.container--narrow { max-width: 760px; }

.pc { display: inline; }

/* ---------- 手書き（赤ペン） ---------- */
.hand {
  font-family: var(--font-hand);
  font-weight: 600;
  color: var(--shu);
  letter-spacing: 0.05em;
  line-height: 1.6;
}

/* 赤ペンの囲み（SMILで描画される手描き楕円） */
.pen-circle {
  font-style: normal;
  position: relative;
  display: inline-block; /* 行またぎで楕円が割れないように */
  padding-inline: .15em;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 200 70" preserveAspectRatio="none"><path d="M15,38 C20,12 88,4 140,10 C181,15 195,31 187,48 C176,66 58,70 27,58 C7,50 9,42 22,32" fill="none" stroke="%23C93A2B" stroke-width="4" stroke-linecap="round" stroke-dasharray="620" stroke-dashoffset="620"><animate attributeName="stroke-dashoffset" from="620" to="0" dur="0.9s" begin="0.9s" fill="freeze"/></path></svg>') center / 100% 100% no-repeat;
}

.pen-circle--light {
  background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 200 70" preserveAspectRatio="none"><path d="M15,38 C20,12 88,4 140,10 C181,15 195,31 187,48 C176,66 58,70 27,58 C7,50 9,42 22,32" fill="none" stroke="%23FF9C86" stroke-width="4" stroke-linecap="round" stroke-dasharray="620" stroke-dashoffset="620"><animate attributeName="stroke-dashoffset" from="620" to="0" dur="0.9s" begin="0.6s" fill="freeze"/></path></svg>');
}

/* 赤ペンの波線アンダーライン */
.pen-under {
  font-weight: 700;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 200 12" preserveAspectRatio="none"><path d="M4,8 C40,2 78,11 118,6 C150,2 180,9 196,5" fill="none" stroke="%23C93A2B" stroke-width="3" stroke-linecap="round"/></svg>') bottom / 100% .5em no-repeat;
  padding-bottom: .45em;
}

@media (prefers-reduced-motion: reduce) {
  .pen-circle {
    background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 200 70" preserveAspectRatio="none"><path d="M15,38 C20,12 88,4 140,10 C181,15 195,31 187,48 C176,66 58,70 27,58 C7,50 9,42 22,32" fill="none" stroke="%23C93A2B" stroke-width="4" stroke-linecap="round"/></svg>');
  }
  .pen-circle--light {
    background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 200 70" preserveAspectRatio="none"><path d="M15,38 C20,12 88,4 140,10 C181,15 195,31 187,48 C176,66 58,70 27,58 C7,50 9,42 22,32" fill="none" stroke="%23FF9C86" stroke-width="4" stroke-linecap="round"/></svg>');
  }
}

/* ---------- デモバナー ---------- */
.demo-banner {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: .25rem 1rem;
  padding: .55rem 1rem;
  background: var(--ink);
  color: var(--paper-2);
  font-size: .8rem;
  letter-spacing: .04em;
  text-align: center;
}

.demo-banner a { color: #fff; }

/* ---------- 読了ライン（scroll-driven / scroll()） ---------- */
.reading-line {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  z-index: 100;
  background: linear-gradient(90deg, var(--ai), var(--shu));
  transform-origin: 0 50%;
  transform: scaleX(0);
}

@supports (animation-timeline: scroll()) {
  .reading-line {
    animation: read-grow linear both;
    animation-timeline: scroll(root);
  }
}

@keyframes read-grow {
  from { transform: scaleX(0); }
  to   { transform: scaleX(1); }
}

/* ---------- ヘッダー ---------- */
.site-head {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: .7rem clamp(1rem, 4vw, 2.5rem);
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--paper-line);
}

.site-head__logo { margin: 0; display: flex; flex-direction: column; line-height: 1.3; }

.site-head__logo-main {
  font-family: var(--font-min);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--ink);
}

.site-head__logo-sub { font-size: .7rem; color: var(--ink-soft); letter-spacing: .1em; }

.site-head__nav { display: flex; align-items: center; gap: clamp(.8rem, 2.5vw, 1.6rem); }

.site-head__nav a {
  font-size: .85rem;
  color: var(--ink);
  text-decoration: none;
}

.site-head__nav a:hover { color: var(--ai); text-decoration: underline; }

.site-head__nav .site-head__cta {
  background: var(--ai);
  color: var(--paper);
  padding: .5em 1.2em;
  border-radius: 999px;
  text-decoration: none;
  transition: background-color .25s;
}

.site-head__nav .site-head__cta:hover { background: var(--ai-deep); color: var(--paper); }

@media (max-width: 720px) {
  .site-head__nav a:not(.site-head__cta) { display: none; }
}

/* ---------- ボタン ---------- */
.btn {
  display: inline-block;
  font-family: var(--font-got);
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: .06em;
  text-decoration: none;
  text-align: center;
  padding: .95em 2.2em;
  border-radius: 999px;
  transition: transform .25s, background-color .25s, box-shadow .25s;
}

.btn--primary {
  background: var(--ai);
  color: var(--paper);
  box-shadow: 0 8px 20px -8px color-mix(in srgb, var(--ai) 65%, transparent);
}

.btn--primary:hover {
  background: var(--ai-deep);
  transform: translateY(-2px);
  box-shadow: 0 12px 26px -8px color-mix(in srgb, var(--ai) 70%, transparent);
}

.btn--ghost {
  border: 1px solid color-mix(in srgb, var(--paper) 55%, transparent);
  color: var(--paper);
}

.btn--ghost:hover { border-color: var(--paper); transform: translateY(-2px); }

.btn--large { font-size: 1.1rem; padding: 1.1em 3em; }

/* ---------- 見出しまわり（共通） ---------- */
.section-label {
  display: flex;
  align-items: center;
  gap: .7rem;
  font-size: .8rem;
  letter-spacing: .22em;
  color: var(--ink-soft);
  margin-bottom: 1.2rem;
}

.section-label span {
  font-family: var(--font-min);
  color: var(--shu);
  font-size: .9rem;
  letter-spacing: .05em;
}

.section-label::after {
  content: "";
  width: 3.5rem;
  height: 1px;
  background: var(--paper-line);
}

.section-title {
  font-size: clamp(1.6rem, 3.6vw, 2.3rem);
  letter-spacing: .04em;
  color: var(--ink);
  margin-bottom: 1.2rem;
}

.section-intro {
  max-width: 38em;
  color: var(--ink-soft);
  margin-bottom: 2.8rem;
}

.section-label--light, .section-intro--light { color: color-mix(in srgb, var(--paper) 72%, transparent); }
.section-label--light::after { background: color-mix(in srgb, var(--paper) 25%, transparent); }
.section-title--light { color: var(--paper); }

/* ---------- スクロール連動の出現（view()） ---------- */
@supports (animation-timeline: view()) {
  .reveal {
    animation: rise linear both;
    animation-timeline: view();
    animation-range: entry 0% entry 45%;
  }
}

@keyframes rise {
  from { opacity: 0; transform: translateY(2rem); }
  to   { opacity: 1; transform: none; }
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  background:
    radial-gradient(120% 90% at 85% 0%, color-mix(in srgb, var(--ai) 82%, #fff 0%) 0%, transparent 55%),
    var(--ai-deep);
  color: var(--paper);
  overflow: clip;
}

.hero__inner {
  position: relative;
  width: min(var(--w-container), 100% - 3rem);
  margin-inline: auto;
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: center;
  padding-block: clamp(4rem, 9vw, 7.5rem);
}

.hero__eyebrow {
  font-size: .85rem;
  letter-spacing: .28em;
  color: color-mix(in srgb, var(--paper) 70%, transparent);
  margin-bottom: 1.6rem;
}

.hero__title {
  font-size: clamp(1.9rem, 4.4vw, 2.9rem);
  font-weight: 700;
  color: var(--paper);
  letter-spacing: .05em;
  line-height: 1.55;
  margin-bottom: 1.8rem;
}

.hero__title-line { display: block; }

.hero__lead {
  color: color-mix(in srgb, var(--paper) 82%, transparent);
  margin-bottom: 2.4rem;
}

.hero__facts {
  display: grid;
  gap: .55rem;
  margin-bottom: 2.6rem;
  border-left: 2px solid color-mix(in srgb, var(--paper) 30%, transparent);
  padding-left: 1.2rem;
}

.hero__fact { display: flex; gap: 1.1rem; align-items: baseline; }

.hero__fact dt {
  font-family: var(--font-min);
  font-size: .8rem;
  letter-spacing: .3em;
  color: color-mix(in srgb, var(--paper) 60%, transparent);
  flex-shrink: 0;
}

.hero__fact dd { font-size: .98rem; }

.hero__fact small {
  display: block;
  font-size: .78rem;
  color: color-mix(in srgb, var(--paper) 60%, transparent);
}

.hero__actions { display: flex; flex-wrap: wrap; gap: 1rem; align-items: center; }

/* 写真＝紙焼きの額装 */
.hero__figure {
  position: relative;
  transform: rotate(1.6deg);
}

.hero__figure img {
  border: 8px solid var(--paper);
  border-bottom-width: 2.6rem;
  border-radius: 2px;
  box-shadow: 0 24px 48px -18px rgba(0, 0, 0, .55);
}

.hero__figcaption {
  position: absolute;
  bottom: .45rem;
  left: 0;
  right: 0;
  text-align: center;
  font-size: .85rem;
}

/* 縦書きの帯（writing-mode） */
.hero__figure { z-index: 1; }

.hero__vertical {
  position: absolute;
  top: 50%;
  /* コンテナ外側の余白（帯）に置く */
  right: calc((100% - 100vw) / 2 + 1.6rem);
  translate: 0 -50%;
  z-index: 0;
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-family: var(--font-min);
  font-size: clamp(.9rem, 1.4vw, 1.1rem);
  letter-spacing: .55em;
  color: color-mix(in srgb, var(--paper) 34%, transparent);
  border-right: 1px solid color-mix(in srgb, var(--paper) 22%, transparent);
  padding-right: .9rem;
  pointer-events: none;
}

@media (max-width: 1260px) {
  .hero__vertical { display: none; }
}

@media (max-width: 960px) {
  .hero__inner { grid-template-columns: 1fr; }
  .hero__figure { max-width: 480px; transform: rotate(1deg); }
  .pc { display: none; }
}

/* ---------- セクション共通の余白 ---------- */
.note, .teacher, .handout, .voices, .fee, .faq {
  padding-block: clamp(4.5rem, 9vw, 7.5rem);
}

/* ---------- 受講生のノート ---------- */
.note { background: var(--paper); }

.note__paper {
  position: relative;
  max-width: 780px;
  background: #fff;
  border: 1px solid var(--paper-line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-paper);
  padding: 2.6rem clamp(1.4rem, 4vw, 3.2rem) 3.4rem;
  /* キャンパスノートの赤い縦罫 */
  background-image: linear-gradient(to right, transparent 0, transparent calc(clamp(1.4rem, 4vw, 3.2rem) - .9rem), color-mix(in srgb, var(--shu) 35%, transparent) calc(clamp(1.4rem, 4vw, 3.2rem) - .9rem), color-mix(in srgb, var(--shu) 35%, transparent) calc(clamp(1.4rem, 4vw, 3.2rem) - .9rem + 1px), transparent calc(clamp(1.4rem, 4vw, 3.2rem) - .9rem + 1px));
}

.note__list { display: grid; }

.note__item {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  gap: .2rem 1.5rem;
  padding-block: 1.05rem;
  border-bottom: 1px solid var(--paper-line);
}

.note__text { font-size: 1.02rem; }

.note__text::before { content: "・"; color: var(--ink-soft); }

.note__pen { font-size: .92rem; }

.note__stamp {
  position: absolute;
  right: clamp(1rem, 4vw, 2.4rem);
  bottom: .9rem;
  font-size: .85rem;
  border: 1.5px solid var(--shu);
  border-radius: 999px;
  padding: .1em .9em;
  rotate: -4deg;
  opacity: .85;
}

.note__resolve {
  margin-top: 3rem;
  font-family: var(--font-min);
  font-size: clamp(1.1rem, 2.2vw, 1.35rem);
  line-height: 2.2;
}

/* ---------- 講師 ---------- */
.teacher { background: var(--paper-2); }

.teacher__grid {
  display: grid;
  grid-template-columns: minmax(260px, 380px) 1fr;
  gap: clamp(2.5rem, 6vw, 5rem);
  align-items: start;
}

.teacher__figure {
  position: relative;
  transform: rotate(-1.4deg);
  margin-top: .8rem;
}

.teacher__figure img {
  border: 8px solid #fff;
  border-radius: 2px;
  box-shadow: var(--shadow-paper);
}

/* マスキングテープ */
.teacher__figure::before {
  content: "";
  position: absolute;
  top: -0.8rem;
  left: 50%;
  translate: -50% 0;
  width: 7rem;
  height: 1.7rem;
  background: color-mix(in srgb, var(--ai-soft) 80%, transparent);
  opacity: .85;
  rotate: -3deg;
  box-shadow: 0 1px 2px rgba(0,0,0,.08);
}

.teacher__figure figcaption {
  margin-top: 1.1rem;
  font-size: .85rem;
  text-align: center;
}

.teacher__yomi {
  display: inline-block;
  margin-left: 1em;
  font-size: .75rem;
  letter-spacing: .3em;
  color: var(--ink-soft);
  font-weight: 400;
}

.teacher__role {
  font-size: .9rem;
  letter-spacing: .08em;
  color: var(--ai);
  margin-bottom: 1.8rem;
}

.teacher__story { display: grid; gap: 1.2rem; max-width: 36em; }

.teacher__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  margin-top: 2.6rem;
  border-block: 1px solid var(--paper-line);
}

.teacher__facts > div {
  flex: 1 1 10rem;
  padding: 1.2rem 1.5rem;
  text-align: center;
}

.teacher__facts > div + div { border-left: 1px solid var(--paper-line); }

.teacher__facts dt {
  font-size: .75rem;
  letter-spacing: .25em;
  color: var(--ink-soft);
  margin-bottom: .3rem;
}

.teacher__facts dd {
  font-family: var(--font-min);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--ai-deep);
  line-height: 1.5;
}

@media (max-width: 840px) {
  .teacher__grid { grid-template-columns: 1fr; }
  .teacher__figure { max-width: 340px; margin-inline: auto; }
}

/* ---------- 時間割 ---------- */
.timetable {
  background:
    radial-gradient(100% 80% at 10% 100%, color-mix(in srgb, var(--ai) 70%, transparent) 0%, transparent 60%),
    var(--ai-deep);
  color: var(--paper);
  padding-block: clamp(4.5rem, 9vw, 7.5rem);
}

.timetable__track {
  position: relative;
  max-width: 820px;
  padding-left: clamp(4.6rem, 9vw, 6.5rem);
}

/* 下地の薄い線 */
.timetable__track::before {
  content: "";
  position: absolute;
  left: clamp(3.4rem, 7vw, 4.9rem);
  top: .5rem;
  bottom: .5rem;
  width: 2px;
  background: color-mix(in srgb, var(--paper) 18%, transparent);
}

/* 墨が引かれていく線（view() タイムライン） */
.timetable__ink {
  position: absolute;
  left: clamp(3.4rem, 7vw, 4.9rem);
  top: .5rem;
  bottom: .5rem;
  width: 2px;
  background: linear-gradient(var(--shu-light), var(--paper));
  transform-origin: top;
  transform: scaleY(1);
}

@supports (animation-timeline: view()) {
  .timetable__ink {
    animation: ink-draw linear both;
    animation-timeline: view();
    animation-range: entry 30% exit 85%;
  }
}

@keyframes ink-draw {
  from { transform: scaleY(0); }
  to   { transform: scaleY(1); }
}

.timetable__list { display: grid; gap: 2.4rem; }

.timetable__row { position: relative; }

.timetable__time {
  position: absolute;
  left: calc(-1 * clamp(4.6rem, 9vw, 6.5rem));
  top: .1rem;
  width: clamp(3rem, 6vw, 4.2rem);
  text-align: right;
  font-family: var(--font-min);
  font-size: .95rem;
  letter-spacing: .06em;
  color: color-mix(in srgb, var(--paper) 75%, transparent);
}

/* 結び目 */
.timetable__row::before {
  content: "";
  position: absolute;
  left: calc(-1 * clamp(4.6rem, 9vw, 6.5rem) + clamp(3.4rem, 7vw, 4.9rem) - 4px);
  top: .55rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--paper);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--paper) 15%, transparent);
}

.timetable__row--break::before { background: var(--shu-light); }

.timetable__period {
  display: inline-block;
  font-family: var(--font-min);
  font-size: .78rem;
  letter-spacing: .2em;
  color: var(--ai-deep);
  background: var(--paper);
  border-radius: 3px;
  padding: .15em .8em;
  margin-bottom: .6rem;
}

.timetable__row--break .timetable__period { background: var(--shu-light); }

.timetable__cell h3 {
  color: var(--paper);
  font-size: 1.18rem;
  margin-bottom: .4rem;
}

.timetable__cell p {
  color: color-mix(in srgb, var(--paper) 72%, transparent);
  font-size: .95rem;
  max-width: 34em;
}

/* ---------- お渡しするもの（container query） ---------- */
.handout { background: var(--paper); container-type: inline-size; container-name: handout; }

.handout__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.2rem;
  counter-reset: handout;
}

@container handout (min-width: 640px) {
  .handout__grid { grid-template-columns: repeat(2, 1fr); }
}

@container handout (min-width: 1000px) {
  .handout__grid { grid-template-columns: repeat(4, 1fr); }
}

.handout__card {
  counter-increment: handout;
  background: #fff;
  border: 1px solid var(--paper-line);
  border-top: 3px solid var(--ai);
  border-radius: var(--radius);
  padding: 1.7rem 1.5rem 1.9rem;
  box-shadow: var(--shadow-paper);
}

.handout__card::before {
  content: "其の" counter(handout, cjk-ideographic);
  display: block;
  font-family: var(--font-min);
  font-size: .78rem;
  letter-spacing: .2em;
  color: var(--ai);
  margin-bottom: .8rem;
}

.handout__card h3 {
  font-size: 1.05rem;
  margin-bottom: .6rem;
}

.handout__card p { font-size: .9rem; color: var(--ink-soft); }

/* ---------- 受講生の声 ---------- */
.voices { background: var(--paper-2); }

.voices__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(280px, 100%), 1fr));
  gap: 1.4rem;
}

.voice {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 1.6rem;
  background: #fff;
  border: 1px solid var(--paper-line);
  border-radius: var(--radius);
  padding: 2rem 1.8rem;
  box-shadow: var(--shadow-paper);
}

.voice blockquote {
  font-size: .95rem;
  line-height: 2;
}

.voice blockquote::before {
  content: "「";
  font-family: var(--font-min);
  color: var(--ai);
  font-size: 1.4rem;
  line-height: 1;
  display: block;
  margin-bottom: .3rem;
}

.voice__author {
  display: flex;
  align-items: center;
  gap: .9rem;
  border-top: 1px dashed var(--paper-line);
  padding-top: 1.2rem;
}

.voice__avatar {
  display: grid;
  place-items: center;
  width: 2.8rem;
  height: 2.8rem;
  border-radius: 50%;
  background: var(--ai-soft);
  color: var(--ai-deep);
  font-family: var(--font-min);
  font-weight: 700;
  font-size: 1.15rem;
  flex-shrink: 0;
}

.voice__author strong { display: block; font-size: .92rem; }
.voice__author small { color: var(--ink-soft); font-size: .78rem; }

/* ---------- 受講料 ---------- */
.fee { background: var(--paper); }

.fee__grid {
  display: grid;
  grid-template-columns: 1.25fr .75fr;
  gap: clamp(2.5rem, 6vw, 5rem);
  align-items: start;
}

.fee__cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(240px, 100%), 1fr));
  gap: 1.2rem;
  margin-bottom: 2rem;
}

.fee__card {
  background: #fff;
  border: 1px solid var(--paper-line);
  border-radius: var(--radius);
  padding: 1.6rem 1.6rem 1.4rem;
  box-shadow: var(--shadow-paper);
}

.fee__card--early { border: 2px solid var(--ai); }

.fee__tag {
  font-size: .8rem;
  letter-spacing: .1em;
  color: var(--ink-soft);
  margin-bottom: .6rem;
}

.fee__card--early .fee__tag { color: var(--ai); font-weight: 700; }

.fee__price {
  font-family: var(--font-min);
  font-size: 2.3rem;
  font-weight: 700;
  color: var(--ink);
  line-height: 1.2;
}

.fee__yen { font-size: 1.2rem; margin-right: .1em; }

.fee__tax {
  font-family: var(--font-got);
  font-size: .75rem;
  font-weight: 400;
  color: var(--ink-soft);
  margin-left: .6em;
}

.fee__note { font-size: .82rem; margin-top: .5rem; }
.fee__card:not(.fee__card--early) .fee__note { color: var(--ink-soft); }

.fee__terms { display: grid; gap: .5rem; max-width: 40em; }

.fee__terms li {
  position: relative;
  padding-left: 1.3em;
  font-size: .88rem;
  color: var(--ink-soft);
}

.fee__terms li::before {
  content: "※";
  position: absolute;
  left: 0;
  color: var(--ai);
}

.fee__figure {
  position: relative;
  transform: rotate(1.4deg);
  margin-top: 3.4rem;
}

.fee__figure img {
  border: 8px solid #fff;
  border-radius: 2px;
  box-shadow: var(--shadow-paper);
}

.fee__figure::before {
  content: "";
  position: absolute;
  top: -0.8rem;
  left: 50%;
  translate: -50% 0;
  width: 7rem;
  height: 1.7rem;
  background: color-mix(in srgb, var(--ai-soft) 80%, transparent);
  opacity: .85;
  rotate: 2deg;
  box-shadow: 0 1px 2px rgba(0,0,0,.08);
}

.fee__figure figcaption {
  margin-top: 1rem;
  font-size: .85rem;
  text-align: center;
}

@media (max-width: 840px) {
  .fee__grid { grid-template-columns: 1fr; }
  .fee__figure { max-width: 420px; margin-inline: auto; margin-top: 1rem; }
}

/* ---------- FAQ（::details-content ＋ :has()） ---------- */
.faq { background: var(--paper-2); }

.faq__list { display: grid; gap: .8rem; }

.faq__item {
  background: #fff;
  border: 1px solid var(--paper-line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-paper);
  transition: opacity .3s;
}

/* ひとつ開いたら、他をそっと暗く */
.faq__list:has(details[open]) .faq__item:not([open]) { opacity: .55; }

.faq__item summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: baseline;
  gap: .9rem;
  padding: 1.25rem 3.2rem 1.25rem 1.6rem;
  font-weight: 700;
  position: relative;
}

.faq__item summary::-webkit-details-marker { display: none; }

.faq__item summary::before {
  content: "問";
  font-family: var(--font-min);
  color: var(--ai);
  flex-shrink: 0;
}

.faq__item summary::after {
  content: "";
  position: absolute;
  right: 1.5rem;
  top: 50%;
  width: .7rem;
  height: .7rem;
  border-right: 2px solid var(--ai);
  border-bottom: 2px solid var(--ai);
  translate: 0 -70%;
  rotate: 45deg;
  transition: rotate .3s, translate .3s;
}

.faq__item[open] summary::after { rotate: 225deg; translate: 0 -30%; }

.faq__item::details-content {
  block-size: 0;
  overflow: clip;
  transition: block-size .45s ease, content-visibility .45s allow-discrete;
}

.faq__item[open]::details-content { block-size: auto; }

.faq__body {
  display: flex;
  gap: .9rem;
  padding: 0 1.6rem 1.5rem;
}

.faq__body::before {
  content: "答";
  font-family: var(--font-min);
  color: var(--shu);
  flex-shrink: 0;
}

.faq__body p { font-size: .93rem; color: var(--ink-soft); }

/* ---------- 申し込み ---------- */
.apply {
  position: relative;
  background:
    radial-gradient(110% 90% at 90% 100%, color-mix(in srgb, var(--ai) 75%, transparent) 0%, transparent 55%),
    var(--ai-deep);
  color: var(--paper);
  padding-block: clamp(5rem, 10vw, 8.5rem);
  overflow: clip;
}

.apply__inner {
  position: relative;
  text-align: center;
  display: grid;
  justify-items: center;
}

.apply__vertical {
  position: absolute;
  top: 50%;
  left: 0;
  translate: 0 -50%;
  writing-mode: vertical-rl;
  font-family: var(--font-min);
  font-size: .95rem;
  letter-spacing: .5em;
  color: color-mix(in srgb, var(--paper) 32%, transparent);
  border-left: 1px solid color-mix(in srgb, var(--paper) 20%, transparent);
  padding-left: .8rem;
  pointer-events: none;
}

.apply__title {
  font-size: clamp(1.7rem, 4.2vw, 2.7rem);
  color: var(--paper);
  line-height: 1.8;
  margin-bottom: 1.6rem;
}

.apply__title em { font-style: normal; }

.apply__lead {
  color: color-mix(in srgb, var(--paper) 78%, transparent);
  margin-bottom: 2.6rem;
}

.apply__sub {
  margin-top: 1.4rem;
  font-size: .8rem;
  color: color-mix(in srgb, var(--paper) 60%, transparent);
}

@media (max-width: 720px) {
  .apply__vertical { display: none; }
}

/* ---------- フッター ---------- */
.footer {
  background: var(--paper);
  border-top: 1px solid var(--paper-line);
  padding-block: 2.8rem;
}

.footer__inner {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 1.6rem 3rem;
  align-items: start;
}

.footer__logo {
  font-family: var(--font-min);
  font-weight: 700;
  margin-bottom: .3rem;
}

.footer__copy { font-size: .78rem; color: var(--ink-soft); }

.footer__nav {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem 1.4rem;
}

.footer__nav a {
  font-size: .85rem;
  color: var(--ink-soft);
  text-decoration: none;
}

.footer__nav a:hover { color: var(--ai); text-decoration: underline; }

.footer__credits {
  grid-column: 1 / -1;
  border-top: 1px dashed var(--paper-line);
  padding-top: 1.2rem;
  font-size: .75rem;
  color: var(--ink-soft);
}

.footer__credits a { color: inherit; }

.footer__tech { margin-top: .2rem; letter-spacing: .02em; }

@media (max-width: 720px) {
  .footer__inner { grid-template-columns: 1fr; }
}

/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  .reveal, .timetable__ink {
    animation: none !important;
    transform: none !important;
  }

  .reading-line { display: none; }

  .btn, .faq__item summary::after { transition: none; }
}