:root {
  --paper: #f7f4ec;
  --paper-deep: #efede3;
  --ink: #292b28;
  --muted: #656961;
  --green: #244e3b;
  --green-dark: #19382b;
  --green-wash: #e9eee7;
  --line: #c9c9bd;
  --serif: "Yu Mincho", "Hiragino Mincho ProN", "Hiragino Mincho Pro", "Noto Serif JP", serif;
  --sans: "Yu Gothic", "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--sans);
  font-size: 18px;
  line-height: 2.15;
  letter-spacing: .035em;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

.hero {
  min-height: 88svh;
  display: grid;
  place-items: center;
  padding: 88px 24px 80px;
  border-top: 7px solid var(--green);
  background:
    linear-gradient(90deg, transparent calc(50% - 321px), rgba(36,78,59,.08) calc(50% - 321px), rgba(36,78,59,.08) calc(50% - 320px), transparent calc(50% - 320px)),
    var(--paper);
}

.hero__inner { width: min(640px, 100%); }

.course-count {
  display: inline-block;
  margin: 0 0 28px;
  padding: 3px 12px;
  border: 1px solid var(--green);
  color: var(--green);
  font-family: var(--serif);
  font-size: .78rem;
  letter-spacing: .12em;
}

.eyebrow {
  margin: 0 0 30px;
  color: var(--green);
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .24em;
}

.hero h1,
.course h2,
.privacy h2 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 500;
  line-height: 1.65;
}

.hero h1 { font-size: clamp(2rem, 5.6vw, 3.35rem); letter-spacing: .055em; }

.hero__lead {
  margin: 44px 0 48px;
  color: #41443f;
  font-family: var(--serif);
  font-size: clamp(1.05rem, 2.5vw, 1.28rem);
  line-height: 2.05;
}

.button {
  display: inline-flex;
  min-height: 58px;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  border: 1px solid var(--green);
  border-radius: 2px;
  color: #fff;
  background: var(--green);
  font: 700 .95rem/1.4 var(--sans);
  letter-spacing: .08em;
  text-decoration: none;
  cursor: pointer;
  transition: background .18s ease, border-color .18s ease;
}

.button:hover { border-color: var(--green-dark); background: var(--green-dark); }
.button:focus-visible, input:focus-visible, a:focus-visible { outline: 3px solid rgba(36,78,59,.28); outline-offset: 3px; }
.button--quiet { width: min(340px, 100%); }

.reading-block { width: min(640px, calc(100% - 48px)); margin-inline: auto; }
.prologue { padding: 128px 0 140px; }
.reading-block p { margin: 0 0 2.35em; }
.reading-block p:last-child { margin-bottom: 0; }
.opening { font-family: var(--serif); font-size: 1.45rem; line-height: 1.85; }
.emphasis { color: var(--green); font-family: var(--serif); font-size: 1.23rem; font-weight: 700; }
.question { margin-block: 4.6em !important; font-family: var(--serif); font-size: clamp(1.35rem, 3.4vw, 1.75rem); line-height: 1.9; }

.source-list {
  margin: -1em 0 2.8em;
  padding: 24px 28px 24px 52px;
  border-left: 2px solid var(--green);
  background: rgba(255,255,255,.34);
  list-style-type: "・";
}

.source-list li { padding-left: .5em; }

.thought-break {
  width: 52px;
  height: 1px;
  margin: 84px auto;
  border: 0;
  background: var(--green);
}

.mid-cta {
  margin-top: 64px;
  text-align: center;
}

.soseki {
  position: relative;
  width: 100%;
  max-width: none;
  padding: 132px max(24px, calc((100% - 640px) / 2)) 144px;
  background: var(--green-wash);
}

.soseki h2 {
  margin: 0 0 2.5em;
  color: var(--green-dark);
  font-family: var(--serif);
  font-size: clamp(1.8rem, 4vw, 2.3rem);
  font-weight: 500;
}

.section-marker {
  position: absolute;
  top: 0;
  left: 50%;
  padding: 8px 18px;
  color: var(--paper);
  background: var(--green);
  font-family: var(--serif);
  font-size: .72rem;
  letter-spacing: .25em;
  transform: translate(-50%, -50%);
}

.course { padding: 128px 24px; background: var(--paper-deep); }
.course__inner { width: min(640px, 100%); margin: auto; }
.course h2 { font-size: clamp(1.8rem, 4.5vw, 2.55rem); }
.course__intro { margin: 42px 0 32px; }

.delivery-title {
  margin: 0 0 14px;
  color: var(--green-dark);
  font-family: var(--serif);
  font-size: 1.08rem;
  font-weight: 600;
}

.delivery-list {
  margin: 0 0 54px;
  padding: 28px 28px 28px 52px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.delivery-list li + li { margin-top: 8px; }
.signup-form label { display: block; margin: 0 0 10px; font-weight: 700; font-size: .9rem; }
.form-row { display: grid; grid-template-columns: 1fr auto; gap: 10px; }

input {
  width: 100%;
  min-height: 58px;
  padding: 12px 16px;
  border: 1px solid #a9aa9f;
  border-radius: 2px;
  color: var(--ink);
  background: #fffef9;
  font: inherit;
  letter-spacing: 0;
}

.form-note { margin: 18px 0 0; color: var(--muted); font-size: .78rem; line-height: 1.8; }
.form-message { min-height: 1.8em; margin: 12px 0 0; color: var(--green); font-size: .84rem; font-weight: 700; }
.form-message.is-error { color: #8a302b; }

.privacy { width: min(640px, calc(100% - 48px)); margin: auto; padding: 88px 0; }
.privacy h2 { margin-bottom: 24px; font-size: 1.3rem; }
.privacy p { margin: 0; color: var(--muted); font-size: .82rem; line-height: 1.9; }

footer {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding: 30px max(24px, calc((100% - 960px) / 2));
  color: #dfe5df;
  background: var(--green-dark);
  font-size: .75rem;
}

footer a { text-underline-offset: 4px; }

@media (max-width: 640px) {
  body { line-height: 2.1; }
  .hero { min-height: auto; padding: 72px 24px 76px; }
  .hero h1 { font-size: 2rem; }
  .hero__lead { margin-block: 36px 42px; }
  .reading-block { width: calc(100% - 40px); }
  .prologue { padding-block: 92px 104px; }
  .soseki { width: 100%; padding: 104px 20px 112px; }
  .opening { font-size: 1.28rem; }
  .reading-block p { margin-bottom: 2.15em; }
  .question { margin-block: 3.8em !important; }
  .thought-break { margin-block: 64px; }
  .course { padding: 96px 20px; }
  .form-row { grid-template-columns: 1fr; }
  .form-row .button { width: 100%; }
  .privacy { width: calc(100% - 40px); padding-block: 68px; }
  footer { flex-direction: column; padding: 28px 20px; }
}

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