/* Novus Chat LP — アプリ本体と同じデザイン言語(生成り・罫線・影なし) */
* { margin: 0; padding: 0; box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

:root {
  --bg: #FAF7F1;
  --surface: #FFFFFF;
  --surface-2: #F0EBE1;
  --ink: #221F1A;
  --ink-2: #3E3A33;
  --ink-3: #57524A;
  --ink-4: #8A8377;
  --ink-5: #A39C90;
  --hairline: #EBE6DC;
  --border: #E0D9CB;
  --clay: #9A5B3B;
  --clay-ink: #7C4830;
  --mono: ui-monospace, SFMono-Regular, Menlo, monospace;
  --wrap: 1000px;
  --col: 640px;
}

html { background: var(--bg); scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  background: var(--bg); color: var(--ink);
  font-family: 'Noto Sans JP', 'Hiragino Sans', system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
  line-height: 1.9;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; }

.wrap { max-width: var(--wrap); margin-inline: auto; padding-inline: 24px; width: 100%; }
.col { max-width: var(--col); }
.eyebrow {
  font-family: var(--mono); font-size: 11px; letter-spacing: .16em;
  color: var(--ink-5); text-transform: uppercase; margin-bottom: 18px;
}

/* ── ヘッダー ── */
.nav {
  position: sticky; top: 0; z-index: 50; background: rgba(250,247,241,.92);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--hairline);
}
.nav .wrap { display: flex; align-items: center; gap: 14px; height: 60px; }
.nav .brand { display: flex; align-items: center; gap: 9px; font-weight: 700; font-size: 15px; letter-spacing: .01em; text-decoration: none; }
.nav .brand img { width: 28px; height: 28px; border-radius: 7px; border: 1px solid var(--border); }
.nav .spacer { flex: 1; }
.nav .nav-cta {
  border: 1px solid var(--ink); background: var(--ink); color: var(--bg);
  border-radius: 999px; padding: 9px 17px; font-size: 12.5px; font-weight: 700;
  text-decoration: none; white-space: nowrap;
}

/* ── ヒーロー ── */
.hero { padding: 52px 0 8px; }
.hero-grid { display: grid; gap: 48px; align-items: center; }
h1 {
  font-size: clamp(30px, 6.6vw, 46px); font-weight: 700;
  line-height: 1.44; letter-spacing: -.025em; margin-bottom: 22px;
}
h1 .accent { color: var(--clay); }
.hero .lead { font-size: clamp(14.5px, 3.7vw, 16.5px); color: var(--ink-3); max-width: 30em; }
.hero .lead strong { color: var(--ink); font-weight: 700; }

.cta-row { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; margin-top: 30px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  background: var(--ink); color: var(--bg); border: 1px solid var(--ink);
  border-radius: 999px; padding: 15px 30px; font-size: 15px; font-weight: 700;
  text-decoration: none; transition: opacity .16s;
}
.btn:hover { opacity: .84; }
.btn.ghost { background: none; color: var(--ink-2); border-color: var(--border); }
.btn-note { font-size: 12px; color: var(--ink-5); }

.trust { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 26px; }
.trust span {
  border: 1px solid var(--border); border-radius: 999px;
  padding: 6px 13px; font-size: 11.5px; color: var(--ink-3); background: var(--surface);
}

/* ── 端末モック(CSSのみ) ── */
.device {
  border: 1px solid var(--border); border-radius: 30px; background: var(--bg);
  padding: 11px; max-width: 320px; margin-inline: auto; width: 100%;
}
.device-screen {
  border: 1px solid var(--hairline); border-radius: 22px; background: var(--bg);
  overflow: hidden; padding: 16px 15px 14px;
}
.dv-head { display: flex; align-items: center; gap: 8px; margin-bottom: 7px; }
.dv-head .bars { width: 17px; height: 11px; position: relative; }
.dv-head .bars i { position: absolute; left: 0; height: 1.5px; background: var(--ink-3); border-radius: 2px; }
.dv-head .bars i:nth-child(1) { top: 0; width: 100%; }
.dv-head .bars i:nth-child(2) { top: 4.5px; width: 100%; }
.dv-head .bars i:nth-child(3) { top: 9px; width: 62%; }
.dv-head .t { flex: 1; text-align: center; font-size: 11.5px; font-weight: 700; }
.dv-head .av { width: 21px; height: 21px; border-radius: 50%; background: var(--surface-2); }
.dv-meta { font-size: 8.6px; color: var(--ink-5); margin-bottom: 13px; letter-spacing: .01em; }
.dv-chat { display: flex; flex-direction: column; gap: 12px; }
.dv-q {
  align-self: flex-end; max-width: 84%; background: var(--surface-2);
  border-radius: 13px 13px 3px 13px; padding: 8px 11px; font-size: 11.4px; line-height: 1.6;
}
.dv-a { font-size: 11.6px; line-height: 1.85; color: var(--ink); }
.dv-input {
  margin-top: 15px; border: 1px solid var(--border); background: var(--surface);
  border-radius: 999px; padding: 8px 8px 8px 14px; display: flex; align-items: center; gap: 8px;
}
.dv-input span { flex: 1; font-size: 10.6px; color: var(--ink-5); }
.dv-input i {
  width: 23px; height: 23px; border-radius: 50%; background: var(--ink);
  display: grid; place-items: center;
}
.dv-input i::after {
  content: ''; width: 6px; height: 6px; border-left: 1.4px solid var(--bg);
  border-top: 1.4px solid var(--bg); transform: rotate(45deg) translate(1px, 1px);
}

/* ── セクション ── */
section { border-top: 1px solid var(--hairline); padding: 60px 0; }
h2 {
  font-size: clamp(22px, 5.2vw, 33px); font-weight: 700;
  line-height: 1.5; letter-spacing: -.015em; margin-bottom: 20px;
}
h3 { font-size: 16.5px; font-weight: 700; margin-bottom: 7px; line-height: 1.6; }
p { font-size: 15px; color: var(--ink-2); margin-bottom: 15px; }
p.sm { font-size: 13.5px; color: var(--ink-3); }
p:last-child { margin-bottom: 0; }
.lead-lg { font-size: clamp(15px, 3.8vw, 17px); color: var(--ink-2); }

.note {
  border-left: 2px solid var(--clay); padding: 6px 0 6px 15px;
  margin: 24px 0; max-width: var(--col);
}
.note .t { font-size: 13.5px; font-weight: 700; color: var(--clay-ink); margin-bottom: 5px; }
.note p { font-size: 13.5px; color: var(--ink-3); margin: 0; }


/* 3層フィルタ図 */
.layers { display: grid; gap: 12px; margin-top: 34px; max-width: 760px; }
.layer {
  border: 1px solid var(--border); border-radius: 14px; background: var(--surface);
  padding: 20px 22px; display: flex; gap: 16px; align-items: flex-start;
}
.layer .num {
  font-family: var(--mono); font-size: 11px; color: var(--clay);
  border: 1px solid var(--clay-border, #DFCFC2); border-radius: 6px;
  padding: 3px 8px; flex-shrink: 0; margin-top: 2px;
}
.layer .b { font-size: 13.5px; color: var(--ink-3); }
.layer.mid { background: var(--surface-2); border-style: dashed; }
.layers-arrow { text-align: center; color: var(--ink-5); font-size: 13px; }

/* 会話サンプル */
.samples { display: grid; gap: 18px; margin-top: 36px; grid-template-columns: 1fr; }
.sample {
  border: 1px solid var(--border); border-radius: 16px; background: var(--surface); padding: 22px;
}
.sample .tag {
  font-family: var(--mono); font-size: 10px; letter-spacing: .12em;
  color: var(--ink-5); text-transform: uppercase; margin-bottom: 14px;
}
.sample .q {
  align-self: flex-end; background: var(--surface-2); border-radius: 14px 14px 4px 14px;
  padding: 9px 13px; font-size: 13.6px; display: inline-block; margin-left: auto;
}
.sample .qwrap { display: flex; margin-bottom: 13px; }
.sample .a { font-size: 13.8px; line-height: 1.9; color: var(--ink); }
.sample .a + .qwrap { margin-top: 18px; }
.sample .hint { font-size: 11.5px; color: var(--ink-5); margin-top: 12px; }

/* 機能リスト */
.feats { border-top: 1px solid var(--hairline); margin-top: 34px; max-width: var(--col); }
.feat { border-bottom: 1px solid var(--hairline); padding: 18px 0; }
.feat .t { font-size: 15px; font-weight: 700; margin-bottom: 3px; }
.feat .d { font-size: 13.3px; color: var(--ink-4); }

/* 料金 */
.price-card {
  border: 1px solid var(--border); border-radius: 20px; background: var(--surface);
  padding: 36px 30px; max-width: 560px; margin-top: 34px;
}
.price-card .free { font-size: clamp(24px, 6vw, 32px); font-weight: 700; line-height: 1.4; }
.price-card .amt { font-size: 16px; color: var(--ink-2); margin-top: 10px; }
.price-card .amt b { font-size: 24px; }
.price-card .per { font-size: 12.5px; color: var(--ink-5); margin-top: 6px; }
.price-list { border-top: 1px solid var(--hairline); margin-top: 24px; }
.price-list div {
  border-bottom: 1px solid var(--hairline); padding: 12px 0;
  font-size: 13.6px; color: var(--ink-2); display: flex; gap: 11px;
}
.price-list div::before { content: '✓'; color: var(--ink); flex-shrink: 0; }
.price-card .btn { width: 100%; margin-top: 26px; }

/* 「使いたい」と言われた方へ */
.ask { background: var(--surface-2); border-radius: 20px; padding: 40px 32px; max-width: 720px; }
.ask h2 { font-size: clamp(20px, 4.6vw, 27px); }

/* FAQ */
.faq { border-top: 1px solid var(--hairline); margin-top: 30px; max-width: 760px; }
details { border-bottom: 1px solid var(--hairline); }
summary {
  padding: 19px 0; font-size: 15px; font-weight: 700; cursor: pointer;
  list-style: none; display: flex; justify-content: space-between; gap: 16px; align-items: center;
}
summary::-webkit-details-marker { display: none; }
summary::after { content: '+'; color: var(--ink-5); font-weight: 400; font-size: 19px; flex-shrink: 0; }
details[open] summary::after { content: '−'; }
details p { font-size: 13.8px; color: var(--ink-3); padding-bottom: 20px; margin: 0; }

/* 最終CTA */
.final { text-align: center; padding: 84px 0; }
.final h2 { max-width: 18em; margin-inline: auto; }
.final .cta-row { justify-content: center; }

/* フッター */
footer { border-top: 1px solid var(--hairline); padding: 40px 0 64px; }
footer .links { display: flex; flex-wrap: wrap; gap: 20px; margin-bottom: 20px; }
footer a { font-size: 13px; color: var(--ink-3); text-decoration: none; }
footer a:hover { color: var(--ink); }
footer .cr { font-size: 11.5px; color: var(--ink-5); }

/* デスクトップ */
@media (min-width: 860px) {
  .hero { padding: 76px 0 16px; }
  .hero-grid { grid-template-columns: 1.14fr .86fr; gap: 52px; }
  .device { margin-inline: 0 auto; }
  .samples { grid-template-columns: repeat(2, 1fr); }
  .samples .sample:first-child { grid-column: 1 / -1; }
  section { padding: 76px 0; }
}


/* ══════════ スクロール体験 ══════════ */

/* 上部の進捗バー: どこまで来たかが分かると最後まで読まれやすい */
.progress {
  position: fixed; top: 0; left: 0; right: 0; height: 2px; z-index: 60;
  background: transparent; pointer-events: none;
}
.progress i {
  display: block; height: 100%; background: var(--clay);
  transform: scaleX(0); transform-origin: 0 50%; transition: transform .12s linear;
}

/* 視界に入ったら浮かび上がる */
/* スクロールに反応して「せり上がる」演出。
   透明度は一切下げない ── 万一アニメーションが動かない環境でも、
   本文が読めなくなることが絶対にないようにするため。 */
.js .reveal { transform: translateY(16px); transition: transform .5s cubic-bezier(.2,.7,.3,1); }
.js .reveal.in { transform: none; }
.pillar.reveal { transition-delay: .04s; }
.pillar.reveal:nth-of-type(2) { transition-delay: .1s; }
.pillar.reveal:nth-of-type(3) { transition-delay: .16s; }
@media (prefers-reduced-motion: reduce) {
  .js .reveal { transform: none; transition: none; }
}

/* ヒーロー下のスクロール誘導 */
.scroll-cue {
  display: inline-flex; align-items: center; gap: 9px; margin-top: 28px;
  font-size: 12.5px; color: var(--ink-4); text-decoration: none;
}
.scroll-cue i {
  width: 22px; height: 22px; border: 1px solid var(--border); border-radius: 50%;
  position: relative; flex-shrink: 0;
}
.scroll-cue i::after {
  content: ''; position: absolute; left: 50%; top: 50%;
  width: 5px; height: 5px; margin: -4px 0 0 -3px;
  border-right: 1.4px solid var(--ink-3); border-bottom: 1.4px solid var(--ink-3);
  transform: rotate(45deg); animation: nudge 1.9s ease-in-out infinite;
}
@keyframes nudge {
  0%, 100% { transform: rotate(45deg) translate(0, 0); opacity: .55; }
  50%      { transform: rotate(45deg) translate(2px, 2px); opacity: 1; }
}
@media (prefers-reduced-motion: reduce) { .scroll-cue i::after { animation: none; } }

/* ══════════ 3つの柱 ══════════ */
.pillars { display: grid; gap: 14px; margin-top: 30px; }
.pillar {
  border: 1px solid var(--border); border-radius: 16px; background: var(--surface);
  padding: 24px 22px;
}
.pillar.accent { border-color: var(--clay-border, #DFCFC2); background: #FDFBF7; }
.pillar .pnum {
  font-family: var(--mono); font-size: 10.5px; letter-spacing: .14em;
  color: var(--ink-5); margin-bottom: 9px;
}
.pillar h3 { font-size: 17px; font-weight: 700; margin-bottom: 8px; line-height: 1.55; }
.pillar p { font-size: 13.8px; line-height: 1.85; color: var(--ink-3); margin-bottom: 0; }
.pillar .micro { font-size: 11.5px; color: var(--ink-5); margin-top: 8px; }

/* 3層の流れを1行で表す */
.flow { display: flex; align-items: center; gap: 8px; margin-top: 14px; flex-wrap: wrap; }
.flow span {
  border: 1px solid var(--border); border-radius: 7px; padding: 5px 10px;
  font-size: 11px; color: var(--ink-2); background: var(--bg);
}
.flow i {
  width: 12px; height: 1px; background: #CFC6B5; flex-shrink: 0; position: relative;
}
.flow i::after {
  content: ''; position: absolute; right: 0; top: -2px;
  border-left: 4px solid #CFC6B5; border-top: 2.5px solid transparent; border-bottom: 2.5px solid transparent;
}

/* 保護者が決められること(料金セクション内) */
.ctrl { margin-top: 26px; max-width: 560px; }
.ctrl-t { font-size: 13px; font-weight: 700; margin-bottom: 12px; }
.ctrl-list { display: flex; flex-wrap: wrap; gap: 7px; }
.ctrl-list span {
  border: 1px solid var(--border); border-radius: 999px; background: var(--surface);
  padding: 7px 13px; font-size: 12px; color: var(--ink-3);
}

@media (min-width: 860px) {
  .pillars { grid-template-columns: repeat(3, 1fr); gap: 16px; }
  .samples { grid-template-columns: 1fr; max-width: 620px; }
  .samples .sample:first-child { grid-column: auto; }
}