/*
Visual thesis: 温かい生成りの紙面に、濃い藍と琥珀を置く大人向け学習ノート。
Content plan: フルブリードの約束、3段階の学習、継続の可視化、無料/Premium、サポート。
Interaction thesis: ヒーローの段階的な出現、言葉の階段の小さな浮遊、リンクの矢印移動。
*/

:root {
  color-scheme: light;
  --paper: #f6f1e7;
  --paper-soft: #fbf8f2;
  --ink: #172238;
  --ink-muted: #596276;
  --accent: #e9a62b;
  --accent-deep: #b97206;
  --line: rgba(23, 34, 56, 0.16);
  --white: #fffdfa;
  --max: 1160px;
  --header-height: 76px;
  --radius: 24px;
  --shadow: 0 26px 70px rgba(23, 34, 56, 0.13);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", "Noto Sans JP", sans-serif;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-size: 16px;
  line-height: 1.8;
}

a {
  color: inherit;
  text-underline-offset: 0.2em;
}

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

.skip-link {
  position: fixed;
  z-index: 100;
  top: 12px;
  left: 12px;
  transform: translateY(-160%);
  padding: 10px 16px;
  background: var(--ink);
  color: var(--white);
  border-radius: 999px;
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: absolute;
  z-index: 20;
  inset: 0 0 auto;
  height: var(--header-height);
  color: var(--white);
}

.site-header-inner {
  width: min(calc(100% - 40px), var(--max));
  height: 100%;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  letter-spacing: 0.02em;
  text-decoration: none;
}

.brand-mark {
  position: relative;
  width: 32px;
  height: 27px;
  border: 2px solid currentColor;
  border-radius: 10px;
}

.brand-mark::after {
  content: "";
  position: absolute;
  left: 5px;
  bottom: -6px;
  width: 9px;
  height: 9px;
  border-left: 2px solid currentColor;
  transform: skewY(-36deg);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 24px;
  font-size: 0.9rem;
  font-weight: 700;
}

.site-nav a {
  position: relative;
  text-decoration: none;
}

.site-nav a::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: -5px;
  left: 0;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 180ms ease;
}

.site-nav a:hover::after,
.site-nav a:focus-visible::after,
.site-nav a[aria-current="page"]::after {
  transform: scaleX(1);
  transform-origin: left;
}

.hero {
  position: relative;
  min-height: 100svh;
  overflow: hidden;
  background:
    radial-gradient(circle at 77% 18%, rgba(233, 166, 43, 0.34), transparent 32%),
    linear-gradient(128deg, #111b31 0%, #1a2a46 58%, #253759 100%);
  color: var(--white);
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.08;
  background-image: linear-gradient(rgba(255,255,255,0.7) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,0.7) 1px, transparent 1px);
  background-size: 80px 80px;
  mask-image: linear-gradient(to right, black, transparent 72%);
}

.hero-inner {
  position: relative;
  z-index: 1;
  width: min(calc(100% - 40px), var(--max));
  min-height: 100svh;
  margin: 0 auto;
  padding: calc(var(--header-height) + 52px) 0 54px;
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(360px, 0.78fr);
  align-items: center;
  gap: clamp(44px, 8vw, 120px);
}

.hero-copy {
  max-width: 680px;
}

.eyebrow {
  margin: 0 0 18px;
  color: var(--accent);
  font-size: 0.77rem;
  font-weight: 900;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.hero-brand {
  margin: 0 0 18px;
  font-size: clamp(3.2rem, 8vw, 7.2rem);
  line-height: 0.98;
  letter-spacing: -0.055em;
}

.hero-title {
  max-width: 560px;
  margin: 0;
  font-size: clamp(1.45rem, 2.8vw, 2.35rem);
  line-height: 1.4;
  letter-spacing: -0.02em;
}

.hero-lede {
  max-width: 540px;
  margin: 22px 0 0;
  color: rgba(255, 253, 250, 0.76);
  font-size: 1.05rem;
}

.hero-actions,
.cta-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  min-height: 50px;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 11px 20px;
  border: 1px solid transparent;
  border-radius: 999px;
  background: var(--accent);
  color: #1c2433;
  font-weight: 850;
  text-decoration: none;
  transition: transform 180ms ease, background 180ms ease;
}

.button::after {
  content: "→";
  transition: transform 180ms ease;
}

.button:hover,
.button:focus-visible {
  transform: translateY(-2px);
  background: #f2b948;
}

.button:hover::after,
.button:focus-visible::after {
  transform: translateX(4px);
}

.text-link {
  font-weight: 800;
  text-decoration-thickness: 1px;
}

.hero-visual {
  position: relative;
  min-height: 540px;
  display: grid;
  align-content: center;
  padding: 38px 0;
}

.word-step {
  position: relative;
  padding: 24px 0 22px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.26);
  font-family: "Hiragino Mincho ProN", "Yu Mincho", serif;
  font-size: clamp(2.5rem, 5vw, 5rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.05em;
  animation: word-float 6s ease-in-out infinite;
}

.word-step:nth-child(2) {
  padding-left: 13%;
  animation-delay: -2s;
}

.word-step:nth-child(3) {
  padding-left: 27%;
  animation-delay: -4s;
}

.word-step small {
  display: block;
  margin-bottom: 10px;
  color: var(--accent);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", sans-serif;
  font-size: 0.72rem;
  font-weight: 900;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.hero-note {
  display: flex;
  justify-content: flex-end;
  gap: 20px;
  margin-top: 24px;
  color: rgba(255, 253, 250, 0.72);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.hero-copy > * {
  animation: hero-in 720ms both cubic-bezier(.2,.8,.2,1);
}

.hero-copy > :nth-child(2) { animation-delay: 80ms; }
.hero-copy > :nth-child(3) { animation-delay: 150ms; }
.hero-copy > :nth-child(4) { animation-delay: 220ms; }
.hero-copy > :nth-child(5) { animation-delay: 290ms; }

.section {
  width: min(calc(100% - 40px), var(--max));
  margin: 0 auto;
  padding: clamp(84px, 12vw, 152px) 0;
}

.section-kicker {
  margin: 0 0 14px;
  color: var(--accent-deep);
  font-size: 0.75rem;
  font-weight: 900;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.section-title {
  max-width: 780px;
  margin: 0;
  font-family: "Hiragino Mincho ProN", "Yu Mincho", serif;
  font-size: clamp(2.1rem, 5vw, 4.5rem);
  line-height: 1.18;
  letter-spacing: -0.045em;
  text-wrap: balance;
}

.section-lede {
  max-width: 680px;
  margin: 22px 0 0;
  color: var(--ink-muted);
  font-size: 1.05rem;
}

.learning-flow {
  margin-top: 62px;
  border-top: 1px solid var(--line);
}

.flow-row {
  display: grid;
  grid-template-columns: 100px minmax(180px, 0.5fr) minmax(280px, 1fr);
  gap: 32px;
  align-items: baseline;
  padding: 34px 0;
  border-bottom: 1px solid var(--line);
}

.flow-number {
  color: var(--accent-deep);
  font-size: 0.78rem;
  font-weight: 900;
  letter-spacing: 0.18em;
}

.flow-row h3,
.legal-section h2 {
  margin: 0;
  font-size: 1.25rem;
  line-height: 1.5;
}

.flow-row p {
  margin: 0;
  color: var(--ink-muted);
}

.progress-band {
  overflow: hidden;
  background: var(--accent);
  color: #172238;
}

.progress-band-inner {
  width: min(calc(100% - 40px), var(--max));
  margin: 0 auto;
  padding: clamp(78px, 10vw, 128px) 0;
}

.progress-band .section-kicker {
  color: rgba(23, 34, 56, 0.66);
}

.progress-band .section-title {
  max-width: 900px;
}

.progress-words {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
  margin-top: 44px;
  padding-top: 28px;
  border-top: 1px solid rgba(23, 34, 56, 0.26);
  font-size: clamp(1rem, 2.2vw, 1.35rem);
  font-weight: 900;
}

.progress-words span::before {
  content: "•";
  margin-right: 12px;
}

.plan-list {
  margin-top: 54px;
  border-top: 1px solid var(--line);
}

.plan-row {
  display: grid;
  grid-template-columns: minmax(150px, 0.35fr) minmax(260px, 1fr) auto;
  gap: 28px;
  align-items: center;
  padding: 30px 0;
  border-bottom: 1px solid var(--line);
}

.plan-name {
  font-size: 1.25rem;
  font-weight: 900;
}

.plan-detail {
  color: var(--ink-muted);
}

.plan-price {
  color: var(--accent-deep);
  font-weight: 900;
  text-align: right;
}

.plan-note {
  margin: 18px 0 0;
  color: var(--ink-muted);
  font-size: 0.86rem;
}

.cta-section {
  width: min(calc(100% - 40px), var(--max));
  margin: 0 auto clamp(60px, 8vw, 100px);
  padding: clamp(48px, 8vw, 88px);
  border-radius: var(--radius);
  background: var(--ink);
  color: var(--white);
  box-shadow: var(--shadow);
}

.cta-section h2 {
  max-width: 720px;
  margin: 0;
  font-family: "Hiragino Mincho ProN", "Yu Mincho", serif;
  font-size: clamp(2rem, 5vw, 4rem);
  line-height: 1.2;
  letter-spacing: -0.04em;
}

.cta-section p {
  max-width: 630px;
  margin: 18px 0 0;
  color: rgba(255, 253, 250, 0.72);
}

.site-footer {
  border-top: 1px solid var(--line);
}

.footer-inner {
  width: min(calc(100% - 40px), var(--max));
  margin: 0 auto;
  padding: 34px 0 44px;
  display: flex;
  justify-content: space-between;
  gap: 30px;
  color: var(--ink-muted);
  font-size: 0.82rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

/* Legal pages */

.legal-page .site-header {
  position: relative;
  background: var(--ink);
}

.legal-hero {
  background: var(--ink);
  color: var(--white);
}

.legal-hero-inner {
  width: min(calc(100% - 40px), var(--max));
  margin: 0 auto;
  padding: 74px 0 82px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(240px, 0.36fr);
  gap: 70px;
  align-items: end;
}

.legal-hero h1 {
  margin: 0;
  font-family: "Hiragino Mincho ProN", "Yu Mincho", serif;
  font-size: clamp(2.4rem, 6vw, 5.2rem);
  line-height: 1.1;
  letter-spacing: -0.045em;
}

.legal-hero .lede {
  max-width: 650px;
  margin: 22px 0 0;
  color: rgba(255, 253, 250, 0.72);
}

.document-meta {
  margin: 0;
  border-top: 1px solid rgba(255,255,255,0.24);
}

.document-meta div {
  display: grid;
  grid-template-columns: 98px 1fr;
  gap: 14px;
  padding: 10px 0;
  border-bottom: 1px solid rgba(255,255,255,0.14);
}

.document-meta dt {
  color: rgba(255,253,250,0.55);
  font-size: 0.76rem;
  font-weight: 800;
}

.document-meta dd {
  margin: 0;
  font-size: 0.84rem;
}

.legal-layout {
  width: min(calc(100% - 40px), var(--max));
  margin: 0 auto;
  padding: 72px 0 120px;
  display: grid;
  grid-template-columns: 240px minmax(0, 760px);
  gap: clamp(54px, 9vw, 130px);
  justify-content: start;
}

.legal-toc {
  position: sticky;
  top: 30px;
  align-self: start;
  display: grid;
  gap: 10px;
  font-size: 0.82rem;
}

.legal-toc strong {
  margin-bottom: 8px;
  color: var(--accent-deep);
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.legal-toc a {
  color: var(--ink-muted);
  text-decoration: none;
}

.legal-toc a:hover,
.legal-toc a:focus-visible {
  color: var(--ink);
  text-decoration: underline;
}

.legal-stack {
  min-width: 0;
}

.legal-section {
  padding: 0 0 44px;
  margin: 0 0 44px;
  border-bottom: 1px solid var(--line);
  scroll-margin-top: 30px;
}

.legal-section p,
.legal-section ul,
.legal-section ol {
  color: #3f4859;
}

.legal-section li + li {
  margin-top: 8px;
}

.legal-callout {
  margin: 24px 0;
  padding: 18px 20px;
  border-left: 4px solid var(--accent);
  background: rgba(233, 166, 43, 0.09);
}

@keyframes hero-in {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes word-float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-7px); }
}

@media (max-width: 840px) {
  :root { --header-height: 68px; }

  .site-nav a:not(:last-child) { display: none; }

  .hero-inner {
    grid-template-columns: 1fr;
    align-content: center;
    gap: 30px;
    padding-top: calc(var(--header-height) + 42px);
  }

  .hero-visual {
    min-height: auto;
    padding: 8px 0 12px;
  }

  .word-step {
    padding: 15px 0;
    font-size: clamp(2.1rem, 11vw, 3.8rem);
  }

  .flow-row {
    grid-template-columns: 62px 1fr;
    gap: 16px 20px;
  }

  .flow-row p {
    grid-column: 2;
  }

  .plan-row {
    grid-template-columns: 1fr auto;
  }

  .plan-detail {
    grid-column: 1 / -1;
    grid-row: 2;
  }

  .legal-hero-inner,
  .legal-layout {
    grid-template-columns: 1fr;
  }

  .legal-hero-inner { gap: 42px; }
  .legal-layout { gap: 42px; }
  .legal-toc { position: static; }
}

@media (max-width: 520px) {
  .site-header-inner,
  .hero-inner,
  .section,
  .progress-band-inner,
  .cta-section,
  .footer-inner,
  .legal-hero-inner,
  .legal-layout {
    width: min(calc(100% - 28px), var(--max));
  }

  .site-nav { gap: 12px; }
  .site-nav a:last-child { font-size: 0.78rem; }
  .hero-brand { font-size: clamp(3.05rem, 19vw, 5.2rem); }
  .hero-actions, .cta-actions { align-items: stretch; flex-direction: column; }
  .button { width: 100%; }
  .flow-row { grid-template-columns: 46px 1fr; }
  .plan-row { grid-template-columns: 1fr; gap: 8px; }
  .plan-detail, .plan-price { grid-column: 1; grid-row: auto; text-align: left; }
  .cta-section { padding: 38px 24px; }
  .footer-inner { flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}