:root {
  --paper: #f7f5f0;
  --ink: #17201c;
  --muted: #69726c;
  --line: #d9ddd4;
  --green: #1c5a46;
  --green-light: #e4eee8;
  --clay: #d6744f;
  --card: #fffefb;
  --serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", SimSun, serif;
  --sans: Inter, "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: var(--sans); line-height: 1.7; }
a { color: inherit; text-decoration: none; }
a:hover { color: var(--green); }
button { font: inherit; }
.shell { width: min(1120px, calc(100% - 40px)); margin: 0 auto; }
.site-header { border-bottom: 1px solid var(--line); position: sticky; top: 0; background: rgba(247,245,240,.94); backdrop-filter: blur(12px); z-index: 10; }
.nav { height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { font-family: var(--serif); font-size: 18px; font-weight: 700; letter-spacing: .04em; white-space: nowrap; }
.nav-links { display: flex; align-items: center; gap: 20px; font-size: 14px; }
.nav-links a { color: var(--muted); }
.nav-links a.active, .nav-links a:hover { color: var(--ink); }
.nav-cta { padding: 7px 12px; color: var(--green) !important; border: 1px solid var(--green); border-radius: 999px; }
.menu-btn { display: none; border: 0; background: transparent; color: var(--ink); font-size: 24px; }
.eyebrow { color: var(--green); font-size: 12px; font-weight: 700; letter-spacing: .14em; text-transform: uppercase; }
.hero { padding: 105px 0 76px; max-width: 840px; }
h1, h2, h3, p { margin-top: 0; }
h1 { font-family: var(--serif); font-size: clamp(42px, 7vw, 82px); line-height: 1.18; letter-spacing: -.045em; margin: 14px 0 28px; font-weight: 700; }
h2 { font-family: var(--serif); font-size: clamp(29px, 4vw, 44px); line-height: 1.24; letter-spacing: -.025em; margin-bottom: 18px; }
h3 { font-family: var(--serif); font-size: 22px; line-height: 1.35; margin-bottom: 8px; }
.lead { max-width: 690px; color: #3d4741; font-family: var(--serif); font-size: 20px; line-height: 1.9; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.button { display: inline-flex; align-items: center; gap: 8px; padding: 11px 17px; border: 1px solid var(--green); border-radius: 2px; color: #fff; background: var(--green); font-size: 14px; font-weight: 600; }
.button:hover { color: #fff; background: #123e30; }
.button.ghost { background: transparent; color: var(--green); }
.button.ghost:hover { color: #fff; }
.now-line { margin-top: 55px; padding-top: 18px; border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; }
.section { padding: 75px 0; border-top: 1px solid var(--line); }
.section-head { display: flex; justify-content: space-between; gap: 20px; align-items: end; margin-bottom: 30px; }
.section-head p { max-width: 520px; margin: 0; color: var(--muted); }
.arrow-link { color: var(--green); font-size: 14px; font-weight: 700; white-space: nowrap; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.card { display: block; background: var(--card); border: 1px solid var(--line); padding: 24px; min-height: 100%; transition: transform .2s ease, border-color .2s ease; }
.card:hover { border-color: #99ab9f; transform: translateY(-2px); color: var(--ink); }
.card-index { color: var(--green); font-family: var(--serif); font-size: 16px; }
.card p, .muted { color: var(--muted); }
.status { display: inline-block; padding: 3px 9px; border-radius: 999px; background: var(--green-light); color: var(--green); font-size: 12px; font-weight: 700; }
.article-card { padding: 24px 0; border-bottom: 1px solid var(--line); display: grid; grid-template-columns: 115px 1fr auto; gap: 24px; align-items: start; }
.article-card[hidden] { display: none; }
.article-card:first-child { border-top: 1px solid var(--line); }
.article-meta { color: var(--muted); font-size: 13px; }
.article-title { font-family: var(--serif); font-size: 23px; font-weight: 700; line-height: 1.35; }
.article-card p { margin: 6px 0 0; color: var(--muted); font-size: 14px; }
.tag { display: inline-block; color: var(--green); font-size: 12px; font-weight: 700; }
.page-hero { padding: 80px 0 48px; max-width: 760px; }
.page-hero h1 { font-size: clamp(42px, 6vw, 65px); margin-bottom: 16px; }
.page-hero p { color: var(--muted); font-family: var(--serif); font-size: 19px; }
.filters { display: flex; gap: 8px; flex-wrap: wrap; margin: 0 0 28px; }
.filter { cursor: pointer; border: 1px solid var(--line); background: transparent; padding: 7px 12px; border-radius: 999px; color: var(--muted); font-size: 13px; }
.filter.active, .filter:hover { color: #fff; background: var(--green); border-color: var(--green); }
.roadmap { border-top: 1px solid var(--line); }
.roadmap-item { display: grid; grid-template-columns: 90px 1fr 130px; gap: 24px; padding: 30px 0; border-bottom: 1px solid var(--line); }
.roadmap-num { color: var(--green); font-family: var(--serif); font-size: 18px; }
.roadmap-item p { color: var(--muted); }
.roadmap-item ul { padding-left: 20px; color: #465049; }
.book-row { display: grid; grid-template-columns: 70px 1fr auto; gap: 18px; padding: 20px 0; border-bottom: 1px solid var(--line); align-items: center; }
.book-no { color: var(--green); font-family: var(--serif); }
.book-row h3 { margin: 0; font-size: 20px; }
.book-row p { margin: 3px 0 0; color: var(--muted); font-size: 13px; }
.progress { height: 6px; background: #e1e3dc; margin-top: 10px; overflow: hidden; }
.progress > span { display: block; height: 100%; background: var(--green); }
.week-card { padding: 28px; border: 1px solid var(--line); background: var(--card); }
.week-card ul { padding-left: 19px; color: var(--muted); }
.quote { margin: 0; padding: 28px; color: var(--green); border-left: 3px solid var(--green); background: var(--green-light); font-family: var(--serif); font-size: 22px; line-height: 1.65; }
.about-copy { max-width: 760px; font-family: var(--serif); font-size: 19px; line-height: 1.95; }
.contact-list { list-style: none; padding: 0; }
.contact-list li { padding: 12px 0; border-bottom: 1px solid var(--line); }
.qr-box { min-height: 200px; display: grid; place-content: center; text-align: center; border: 1px dashed #9ca9a1; background: #f0f1eb; color: var(--muted); padding: 20px; }
.qr-image { display: block; width: 100%; max-width: 560px; height: auto; margin: 20px auto 0; border: 1px solid var(--line); }
.article-page { width: min(760px, 100%); margin: 0 auto; padding: 80px 0; }
.article-page h1 { font-size: clamp(38px, 6vw, 64px); }
.article-page .article-info { padding: 18px 0; color: var(--muted); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); font-size: 14px; }
.article-page .article-body { padding: 40px 0; font-family: var(--serif); font-size: 19px; line-height: 2; }
.article-page .source-box { padding: 25px; background: var(--green-light); border-left: 3px solid var(--green); }
.site-footer { padding: 45px 0; border-top: 1px solid var(--line); color: var(--muted); font-size: 13px; }
.footer-row { display: flex; justify-content: space-between; gap: 20px; }
.footer-links { display: flex; flex-wrap: wrap; gap: 16px; }

@media (max-width: 720px) {
  .shell { width: min(100% - 32px, 1120px); }
  .nav { height: 62px; }
  .menu-btn { display: block; }
  .nav-links { display: none; position: absolute; top: 62px; left: 0; width: 100%; padding: 15px 16px 20px; background: var(--paper); border-bottom: 1px solid var(--line); flex-direction: column; align-items: flex-start; gap: 13px; }
  .nav-links.open { display: flex; }
  .hero { padding: 40px 0 44px; }
  /* Keep both headline phrases readable on narrow screens; desktop is unchanged. */
  .hero h1 {
    font-size: clamp(26px, 7.8vw, 48px);
    line-height: 1.3;
    margin: 12px 0 20px;
    text-wrap: balance;
  }
  .lead { font-size: 18px; }
  .section { padding: 52px 0; }
  .section-head { display: block; }
  .section-head p { margin: 10px 0 15px; }
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .article-card { grid-template-columns: 1fr; gap: 8px; }
  .article-card > .arrow-link { display: none; }
  .roadmap-item { grid-template-columns: 1fr; gap: 8px; }
  .book-row { grid-template-columns: 1fr; gap: 6px; }
  .book-row > .status { width: fit-content; }
  .footer-row { flex-direction: column; }
}