@charset "UTF-8";

:root {
  --cream: #fbf3e4;
  --cream-2: #f5ead6;
  --forest: #2f6b4f;
  --forest-deep: #1f4b37;
  --moss: #7d9581;
  --ink: #26301f;
  --muted: #6b7660;
  --line: #e2d6bf;
  --paper: #fffdf8;
  --shell: 1160px;
  --header-height: 70px;
  --serif: "Songti SC", "STSong", "SimSun", serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-height) + 16px); }
body {
  min-width: 320px;
  margin: 0;
  color: var(--ink);
  background: var(--cream);
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.75;
}
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { color: inherit; font: inherit; }
svg { display: block; }
a:focus-visible, button:focus-visible, summary:focus-visible { outline: 3px solid var(--forest); outline-offset: 4px; }
.page-shell { width: min(calc(100% - 48px), var(--shell)); margin: 0 auto; }

.eyebrow {
  display: inline-block;
  padding: 3px 11px;
  border: 1px solid #cfdccd;
  border-radius: 4px;
  margin: 0 0 13px;
  color: var(--forest);
  background: rgba(47, 107, 79, .06);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 2px;
  line-height: 1.6;
}

/* header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  border-bottom: 1px solid var(--line);
  background: rgba(251, 243, 228, .96);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}
.nav-shell {
  display: flex;
  align-items: center;
  width: min(calc(100% - 48px), var(--shell));
  min-height: var(--header-height);
  margin: 0 auto;
  gap: 18px;
}
.brand { display: inline-flex; align-items: center; flex: none; gap: 9px; font-family: var(--serif); font-size: 21px; font-weight: 700; letter-spacing: .5px; }
.brand img { width: 34px; height: 34px; border-radius: 4px; object-fit: contain; background: var(--cream-2); }
.primary-nav { margin-left: auto; }
.primary-nav ul { display: flex; align-items: center; gap: clamp(12px, 1.8vw, 24px); padding: 0; margin: 0; list-style: none; }
.primary-nav a { display: block; padding: 6px 0; color: #526049; font-size: 13px; font-weight: 700; border-bottom: 2px solid transparent; }
.primary-nav a:hover { border-bottom-color: var(--forest); color: var(--forest); }
.nav-actions { display: flex; align-items: center; flex: none; gap: 10px; }
.nav-download {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 38px;
  padding: 0 16px;
  border: 1px solid var(--forest);
  border-radius: 3px;
  background: var(--forest);
  color: #fdf8ec;
  font-size: 12.5px;
  font-weight: 700;
  white-space: nowrap;
  transition: background .18s ease, color .18s ease;
}
.nav-download:hover { background: #fdf8ec; color: var(--forest); }
.menu-toggle { display: none; width: 40px; height: 40px; padding: 0; border: 1px solid var(--line); border-radius: 3px; background: transparent; cursor: pointer; }
.menu-toggle span { display: block; width: 18px; height: 2px; margin: 5px auto; background: var(--ink); transition: transform .18s ease; }
.menu-toggle[aria-expanded="true"] span:first-child { transform: translateY(3.5px) rotate(45deg); }
.menu-toggle[aria-expanded="true"] span:last-child { transform: translateY(-3.5px) rotate(-45deg); }

/* hero: 左书脊竖排 + 右三本封面阶梯 + 底部卷数条 */
.hero {
  position: relative;
  padding: 54px 0 0;
  border-bottom: 1px solid var(--line);
  background:
    linear-gradient(90deg, rgba(47, 107, 79, .05) 0 1px, transparent 1px) 0 0 / 44px 44px,
    linear-gradient(180deg, #fdf7ea, var(--cream));
}
.hero-grid {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr) minmax(280px, 372px);
  align-items: center;
  gap: clamp(20px, 3.4vw, 46px);
  padding-bottom: 34px;
}
.hero-spine {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  align-self: stretch;
  padding: 22px 10px 18px;
  border-radius: 3px;
  background: linear-gradient(180deg, var(--forest), var(--forest-deep));
  color: #fbf3e4;
  box-shadow: 6px 10px 26px rgba(31, 75, 55, .24);
}
.hero-spine h1 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(30px, 3.4vw, 40px);
  font-weight: 700;
  letter-spacing: 6px;
  line-height: 1.15;
  writing-mode: vertical-rl;
  text-orientation: upright;
}
.spine-tag {
  margin: 0;
  padding-top: 10px;
  border-top: 1px solid rgba(251, 243, 228, .35);
  color: #cfdccd;
  font-size: 10px;
  letter-spacing: 1.4px;
  writing-mode: vertical-rl;
  text-orientation: upright;
}
.hero-copy { min-width: 0; }
.hero-kicker {
  margin: 0 0 12px;
  color: var(--moss);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 2.4px;
}
.hero-subtitle {
  margin: 0;
  color: var(--forest-deep);
  font-family: var(--serif);
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 700;
  letter-spacing: 1px;
  line-height: 1.35;
}
.hero-lead { max-width: 500px; margin: 14px 0 0; color: var(--muted); font-size: 14px; }
.hero-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 18px; margin-top: 26px; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 26px;
  border: 1px solid transparent;
  border-radius: 3px;
  font-size: 14px;
  font-weight: 700;
  transition: transform .18s ease, background .18s ease, color .18s ease;
}
.button-primary { background: var(--forest); color: #fdf8ec; box-shadow: 0 12px 24px rgba(31, 75, 55, .2); }
.button-primary:hover { background: var(--forest-deep); transform: translateY(-2px); }
.button-large { min-height: 52px; padding: 0 32px; font-size: 15px; }
.text-link { color: #4a5f45; border-bottom: 1px dashed #b3c3ae; font-size: 13px; font-weight: 700; }
.text-link span { margin-left: 4px; color: var(--forest); }

.cover-stair { position: relative; display: flex; align-items: flex-end; justify-content: flex-end; gap: 0; min-height: 300px; }
.cover-card {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 30%;
  padding: 18px 8px 16px;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: var(--paper);
  box-shadow: 0 12px 26px rgba(66, 56, 33, .12);
  overflow: hidden;
}
.cover-card::before {
  position: absolute;
  top: 12px;
  bottom: 12px;
  left: 7px;
  width: 2px;
  content: "";
  background: rgba(47, 107, 79, .16);
}
.cover-card:nth-child(1) { height: 218px; margin-bottom: 0; background: #fdfbf4; }
.cover-card:nth-child(2) { height: 258px; margin: 0 -6px 22px; background: #f7f1e2; }
.cover-card:nth-child(3) { height: 296px; margin-bottom: 46px; background: #fcf6e8; }
.cover-no { color: var(--moss); font-size: 10px; letter-spacing: 1.4px; }
.cover-name {
  flex: 1 1 auto;
  display: flex;
  align-items: center;
  min-height: 0;
  margin: 8px 0;
  color: var(--forest-deep);
  font-family: var(--serif);
  font-size: 16px;
  letter-spacing: 3px;
  writing-mode: vertical-rl;
  text-orientation: upright;
  white-space: nowrap;
}
.cover-card em { white-space: nowrap; color: #97a08c; font-size: 9.5px; font-style: normal; }

.volume-bar {
  display: grid;
  grid-template-columns: repeat(8, minmax(0, 1fr));
  gap: 0;
  padding: 12px 0 16px;
  margin: 0;
  border-top: 1px solid var(--line);
  list-style: none;
  counter-reset: vol;
}
.volume-bar li {
  position: relative;
  padding: 8px 4px 0;
  border-top: 2px solid #cfdccd;
  color: #7f8a72;
  font-size: 10.5px;
  text-align: center;
  letter-spacing: .5px;
}
.volume-bar li::before {
  position: absolute;
  top: -5px;
  left: 50%;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  content: "";
  background: #cfdccd;
  transform: translateX(-50%);
}
.volume-bar .is-now { border-top-color: var(--forest); color: var(--forest); font-weight: 700; }
.volume-bar .is-now::before { background: var(--forest); box-shadow: 0 0 0 4px rgba(47, 107, 79, .14); }

/* features: 2×2 大编号 */
.features { padding: 64px 0 68px; background: var(--paper); }
.section-heading { margin-bottom: 30px; }
.section-heading h2, .download h2 { margin: 0; font-family: var(--serif); font-size: clamp(24px, 2.7vw, 32px); font-weight: 700; letter-spacing: .5px; line-height: 1.35; }
.section-heading > p:last-child { max-width: 640px; margin: 10px 0 0; color: var(--muted); font-size: 14px; }
.feature-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0; border: 1px solid var(--line); }
.feature-card { padding: 26px 26px 24px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.feature-card:nth-child(2n) { border-right: 0; }
.feature-card:nth-child(n+3) { border-bottom: 0; }
.feature-no {
  display: block;
  margin-bottom: 6px;
  color: #c2cdb9;
  font-family: var(--serif);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
}
.feature-card h3 { margin: 0 0 7px; font-size: 17px; font-weight: 700; color: var(--forest-deep); }
.feature-card p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.85; }

/* shots: 2×2 四宫格 */
.shots { padding: 62px 0 66px; background: var(--cream-2); }
.shot-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; max-width: 900px; margin: 0 auto; }
.shot-card { display: grid; grid-template-columns: 152px minmax(0, 1fr); align-items: stretch; margin: 0; border: 1px solid var(--line); border-radius: 3px; background: var(--paper); overflow: hidden; }
.shot-card img { width: 100%; height: auto; aspect-ratio: 337 / 600; object-fit: cover; object-position: center 8%; }
.shot-card figcaption { display: flex; flex-direction: column; justify-content: center; gap: 5px; padding: 18px 18px; border-left: 1px solid var(--line); }
.shot-card figcaption b { color: var(--moss); font-family: var(--serif); font-size: 15px; }
.shot-card figcaption span { display: flex; flex-direction: column; font-size: 15px; font-weight: 700; line-height: 1.4; }
.shot-card figcaption small { color: var(--muted); font-size: 11px; font-weight: 400; }

/* faq: 居中标题 + 单列列表 */
.faq { padding: 64px 0 70px; background: var(--paper); }
.faq-wrap { max-width: 860px; }
.faq-list { border-top: 1px solid var(--line); counter-reset: faq; }
.faq-list details { border-bottom: 1px solid var(--line); }
.faq-list summary { display: flex; align-items: center; gap: 14px; padding: 18px 0; cursor: pointer; list-style: none; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary h3 { flex: 1 1 auto; margin: 0; font-size: 15.5px; font-weight: 700; }
.faq-list summary i { position: relative; flex: none; width: 22px; height: 22px; border-radius: 50%; background: rgba(47, 107, 79, .1); }
.faq-list summary i::before,
.faq-list summary i::after { position: absolute; top: 50%; left: 50%; width: 9px; height: 1.5px; content: ""; background: var(--forest); transform: translate(-50%, -50%); }
.faq-list summary i::after { transform: translate(-50%, -50%) rotate(90deg); transition: transform .2s ease; }
.faq-list details[open] summary i::after { transform: translate(-50%, -50%) rotate(0); }
.faq-list details p { padding: 0 40px 18px 0; margin: 0; color: var(--muted); font-size: 13.5px; line-height: 1.9; }

/* reviews: 双列 */
.reviews { padding: 62px 0 68px; background: var(--cream-2); }
.review-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; padding: 0; margin: 0; list-style: none; }
.review-card { padding: 20px 22px; border: 1px solid var(--line); border-radius: 3px; background: var(--paper); }
.review-meta { display: flex; align-items: baseline; justify-content: space-between; flex-wrap: wrap; gap: 6px; padding-bottom: 8px; margin-bottom: 8px; border-bottom: 1px dashed var(--line); }
.review-meta b { color: var(--forest); font-size: 13px; font-weight: 700; }
.review-meta b::before { margin-right: 6px; content: "「"; color: #bcc9b6; }
.review-meta time { color: #9aa392; font-size: 10.5px; }
.review-card p { margin: 0; color: #4d5a45; font-size: 13px; line-height: 1.85; }

/* steps: 三列卷卡 */
.steps { padding: 62px 0 66px; background: var(--paper); }
.step-list { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; padding: 0; margin: 0; list-style: none; }
.step-list li { position: relative; padding: 24px 22px 22px; border: 1px solid var(--line); border-left: 4px solid var(--forest); border-radius: 3px; background: var(--cream); }
.step-list span { display: block; margin-bottom: 8px; color: #b6c3ad; font-family: var(--serif); font-size: 20px; }
.step-list h3 { margin: 0 0 6px; font-size: 16.5px; font-weight: 700; color: var(--forest-deep); }
.step-list p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.8; }

/* download: 左文右按钮 */
.download { padding: 26px 0 56px; background: var(--paper); }
.download-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 340px);
  align-items: center;
  gap: clamp(20px, 4vw, 48px);
  padding: 40px clamp(22px, 4vw, 46px);
  border: 1px solid #cfdccd;
  border-radius: 4px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, .6), transparent),
    var(--cream-2);
}
.download .eyebrow { margin-bottom: 10px; }
.download h2 { color: var(--forest-deep); }
.download-inner > .download-copy > p:last-child { max-width: 460px; margin: 11px 0 0; color: var(--muted); font-size: 13.5px; }
.download-act { justify-self: end; text-align: right; }
.download-notes { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 6px 16px; padding: 16px 0 0; margin: 18px 0 0; border-top: 1px solid var(--line); list-style: none; }
.download-notes li { color: #7f8a72; font-size: 11px; }
.download-notes li::before { margin-right: 6px; content: "◆"; color: #b6c3ad; }

/* footer */
.site-footer { padding: 40px 0 48px; border-top: 1px solid var(--line); background: var(--cream); }
.footer-grid { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 18px 36px; align-items: start; }
.footer-brand strong { font-family: var(--serif); font-size: 17px; }
.footer-brand p { margin: 3px 0 0; color: var(--muted); font-size: 12px; }
.footer-nav { display: flex; flex-wrap: wrap; gap: 8px 20px; }
.footer-nav a { color: #526049; font-size: 12px; }
.footer-nav a:hover { color: var(--forest); }
.footer-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 18px; margin-top: 22px; padding-top: 16px; border-top: 1px solid var(--line); color: var(--muted); font-size: 12px; }
.footer-meta p { margin: 0; }
.footer-meta a { color: var(--muted); }
.disclaimer { grid-column: 1 / -1; margin: 0; color: #93917d; font-size: 11.5px; line-height: 1.8; }

@media (max-width: 1024px) {
  .hero-grid { grid-template-columns: 84px minmax(0, 1fr) minmax(230px, 300px); }
  .shot-card { grid-template-columns: 108px minmax(0, 1fr); }
}
@media (max-width: 900px) {
  .menu-toggle { display: block; }
  .primary-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    padding: 6px 24px 14px;
    border-bottom: 1px solid var(--line);
    background: var(--cream);
    box-shadow: 0 16px 26px rgba(66, 56, 33, .12);
  }
  .primary-nav.is-open { display: block; }
  .primary-nav ul { flex-direction: column; align-items: stretch; gap: 0; }
  .primary-nav a { padding: 12px 0; border-bottom: 1px solid var(--line); }
  .hero-grid { grid-template-columns: 74px minmax(0, 1fr); gap: 18px; }
  .cover-stair { grid-column: 1 / -1; justify-content: center; min-height: 250px; margin-top: 8px; }
  .cover-card { width: 30%; max-width: 150px; }
  .cover-name { font-size: 14px; letter-spacing: 2px; }
  .cover-card:nth-child(1) { height: 180px; }
  .cover-card:nth-child(2) { height: 212px; margin-bottom: 18px; }
  .cover-card:nth-child(3) { height: 244px; margin-bottom: 38px; }
  .volume-bar { grid-template-columns: repeat(4, minmax(0, 1fr)); row-gap: 14px; }
  .feature-grid { grid-template-columns: 1fr; }
  .feature-card, .feature-card:nth-child(2n) { border-right: 0; border-bottom: 1px solid var(--line); }
  .feature-card:last-child { border-bottom: 0; }
  .download-inner { grid-template-columns: 1fr; }
  .download-act { justify-self: start; text-align: left; }
  .download-notes { justify-content: flex-start; }
}
@media (max-width: 600px) {
  .page-shell, .nav-shell { width: calc(100% - 32px); }
  .hero { padding-top: 34px; }
  .hero-grid { grid-template-columns: 58px minmax(0, 1fr); gap: 14px; }
  .hero-spine { padding: 16px 7px 14px; }
  .hero-spine h1 { font-size: 22px; letter-spacing: 3px; }
  .spine-tag { font-size: 9px; }
  .hero-subtitle { font-size: 22px; }
  .shot-grid { grid-template-columns: 1fr; }
  .shot-card { grid-template-columns: 96px minmax(0, 1fr); }
  .shot-card figcaption { padding: 14px 12px; }
  .review-list { grid-template-columns: 1fr; }
  .step-list { grid-template-columns: 1fr; }
  .volume-bar li { font-size: 9.5px; }
  .footer-grid { grid-template-columns: 1fr; }
}
@media (max-width: 380px) {
  .brand { font-size: 17px; gap: 6px; }
  .brand img { width: 28px; height: 28px; }
  .nav-actions { gap: 7px; }
  .nav-download { min-height: 32px; padding: 0 9px; font-size: 10.5px; }
  .menu-toggle { width: 32px; height: 32px; }
  .hero-grid { grid-template-columns: 50px minmax(0, 1fr); gap: 10px; }
  .hero-spine h1 { font-size: 19px; letter-spacing: 2px; }
  .hero-subtitle { font-size: 19px; }
  .button { width: 100%; }
}