/* 忆途产品主页样式（CR-116 / SITE-001）
   颜色与字体见 docs/品牌与视觉规范.md：墨绿 + 纸色为主，朱红只用在印章，暖金小面积点缀。
   手机优先：正文不小于 18px，按钮不低于 48px，对比度达到 WCAG AA。 */

:root {
  --green: #34453b;
  --green-2: #405548;
  --green-soft: #e7eee6;
  --paper: #f8f5ef;
  --card: #fffdf8;
  --ink: #2f3b35;
  --muted: #5d675f;
  --line: rgba(73, 88, 78, 0.16);
  --gold: #b8893a;
  --seal: #a8402e;
  --serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", "SimSun", serif;
  --sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  --radius: 14px;
  --wrap: 1080px;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 18px/1.8 var(--sans);
}
img { max-width: 100%; display: block; }
a { color: var(--green); }
a:focus-visible, button:focus-visible { outline: 3px solid var(--gold); outline-offset: 2px; }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 20px; }

/* 页眉 */
.site-header { position: sticky; top: 0; z-index: 10; background: rgba(248, 245, 239, 0.94); backdrop-filter: blur(6px); border-bottom: 1px solid var(--line); }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--green); }
.brand img { height: 40px; width: auto; }
.brand span { font-family: var(--serif); font-size: 24px; font-weight: 600; letter-spacing: 4px; }
.site-nav { display: flex; gap: 6px; }
.site-nav a { text-decoration: none; font-size: 16px; padding: 8px 10px; border-radius: 8px; color: var(--muted); }
.site-nav a:hover { background: var(--green-soft); color: var(--green); }
@media (max-width: 640px) { .site-nav .optional { display: none; } }

/* 按钮 */
.btn { display: inline-flex; align-items: center; justify-content: center; min-height: 52px; padding: 0 26px; border-radius: 12px; font-size: 18px; font-weight: 600; text-decoration: none; border: 1.5px solid var(--green); cursor: pointer; font-family: var(--sans); }
.btn-primary { background: var(--green); color: var(--card); }
.btn-primary:hover { background: var(--green-2); }
.btn-ghost { background: transparent; color: var(--green); }
.btn-ghost:hover { background: var(--green-soft); }

/* 首屏 */
.hero { padding: 56px 0 48px; }
.hero .wrap { display: grid; gap: 40px; align-items: center; }
@media (min-width: 900px) { .hero .wrap { grid-template-columns: 1.1fr 0.9fr; } .hero { padding: 88px 0 72px; } }
.hero h1 { font-family: var(--serif); font-size: clamp(32px, 6vw, 50px); line-height: 1.35; margin: 0 0 18px; color: var(--green); font-weight: 700; letter-spacing: 1px; }
.hero .lead { font-size: clamp(18px, 2.4vw, 21px); color: var(--muted); margin: 0 0 30px; max-width: 34em; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; }
.hero-note { margin-top: 16px; font-size: 15px; color: var(--muted); }

/* 首屏右侧：一页书稿 */
.page-card { position: relative; background: var(--card); border: 1px solid var(--line); border-radius: 6px; padding: 34px 32px 64px; box-shadow: 0 18px 40px rgba(52, 69, 59, 0.10), 0 2px 0 rgba(52, 69, 59, 0.04); font-family: var(--serif); }
.page-card::before { content: ""; position: absolute; left: 10px; right: 10px; bottom: -8px; height: 8px; background: #f1ece1; border: 1px solid var(--line); border-top: 0; border-radius: 0 0 6px 6px; }
.page-card h3 { font-size: 22px; margin: 0 0 4px; color: var(--ink); font-weight: 600; }
.page-card p.byline { font-family: var(--sans); font-size: 14px; color: var(--muted); margin: 0 0 16px; text-indent: 0; line-height: 1.6; }
.page-card p { font-size: 17px; line-height: 2; margin: 0 0 10px; text-indent: 2em; }
.page-card .seal { position: absolute; right: 26px; bottom: 18px; width: 30px; }
.page-card .sample-tag { position: absolute; left: 32px; bottom: 22px; font-family: var(--sans); font-size: 13px; color: var(--muted); }

/* 通用区块 */
section.block { padding: 64px 0; }
section.block.alt { background: var(--card); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.block h2 { font-family: var(--serif); font-size: clamp(26px, 4vw, 34px); color: var(--green); margin: 0 0 10px; font-weight: 700; }
.block .sub { color: var(--muted); margin: 0 0 34px; max-width: 40em; }

/* 三步 */
.steps { display: grid; gap: 18px; counter-reset: step; }
@media (min-width: 760px) { .steps { grid-template-columns: repeat(3, 1fr); } }
.step { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 26px 24px; }
.alt .step { background: var(--paper); }
.step .num { display: inline-flex; width: 38px; height: 38px; border-radius: 50%; align-items: center; justify-content: center; background: var(--green); color: var(--card); font-family: var(--serif); font-size: 18px; font-weight: 700; margin-bottom: 12px; }
.step h3 { font-family: var(--serif); font-size: 22px; margin: 0 0 6px; color: var(--ink); }
.step p { margin: 0; color: var(--muted); font-size: 17px; }

/* 样章：原话与成文对照 */
.compare { display: grid; gap: 18px; margin-bottom: 30px; }
@media (min-width: 860px) { .compare { grid-template-columns: 1fr 1fr; } }
.compare .col { border-radius: var(--radius); padding: 24px; }
.compare .said { background: #f1ede4; border: 1px dashed rgba(73, 88, 78, 0.28); }
.compare .said p { font-size: 17px; color: #4a524c; margin: 0; }
.compare .written { background: var(--card); border: 1px solid var(--line); font-family: var(--serif); }
.compare .written p { font-size: 18px; line-height: 2; margin: 0; text-indent: 2em; }
.compare p.label, .compare .written p.label { font-family: var(--sans); font-size: 14px; font-weight: 600; letter-spacing: 1px; color: var(--muted); margin: 0 0 10px; text-indent: 0; line-height: 1.6; }
.samples { display: grid; gap: 18px; }
@media (min-width: 860px) { .samples { grid-template-columns: 1fr 1fr; } }
.sample { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 26px 26px 18px; }
.sample .kind { font-size: 14px; color: var(--gold); font-weight: 600; letter-spacing: 1px; margin: 0 0 4px; }
.sample h3 { font-family: var(--serif); font-size: 24px; margin: 0 0 4px; color: var(--ink); }
.sample .who { font-size: 15px; color: var(--muted); margin: 0 0 14px; }
.sample .body { font-family: var(--serif); }
.sample .body p { font-size: 18px; line-height: 2; margin: 0 0 12px; text-indent: 2em; }
.sample details summary { cursor: pointer; color: var(--green); font-weight: 600; font-size: 17px; padding: 10px 0; list-style: none; }
.sample details summary::-webkit-details-marker { display: none; }
.sample details[open] summary .more { display: none; }
.sample details:not([open]) summary .less { display: none; }
.disclaim { font-size: 15px; color: var(--muted); margin-top: 18px; }

/* 两种用法、讲述方式、隐私：卡片 */
.cards { display: grid; gap: 18px; }
@media (min-width: 760px) { .cards.two { grid-template-columns: 1fr 1fr; } .cards.three { grid-template-columns: repeat(3, 1fr); } }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; }
.alt .card { background: var(--paper); }
.card h3 { font-family: var(--serif); font-size: 21px; margin: 0 0 8px; color: var(--ink); }
.card p { margin: 0; color: var(--muted); font-size: 17px; }
.card ul { margin: 0; padding-left: 1.2em; color: var(--muted); font-size: 17px; }
.card li { margin: 4px 0; }

/* 价格 */
.price-list { list-style: none; padding: 0; margin: 0 0 18px; display: grid; gap: 10px; }
.price-list li { display: flex; justify-content: space-between; gap: 16px; background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 14px 18px; }
.alt .price-list li { background: var(--paper); }
.price-list .what { color: var(--ink); }
.price-list .cost { color: var(--green); font-weight: 600; white-space: nowrap; }
.notice { background: var(--green-soft); border-radius: 12px; padding: 14px 18px; color: var(--green); font-size: 17px; }

/* 常见问题 */
.faq details { background: var(--card); border: 1px solid var(--line); border-radius: 12px; margin-bottom: 10px; }
.faq summary { cursor: pointer; padding: 16px 20px; font-weight: 600; font-size: 18px; list-style: none; position: relative; padding-right: 48px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; position: absolute; right: 20px; top: 12px; font-size: 24px; color: var(--muted); }
.faq details[open] summary::after { content: "−"; }
.faq details p { margin: 0; padding: 0 20px 18px; color: var(--muted); font-size: 17px; }

/* 开始 */
.start { text-align: center; }
.start .codes { display: flex; flex-wrap: wrap; gap: 24px; justify-content: center; margin: 26px 0 10px; }
.qr { width: 200px; text-align: center; }
.qr .box { width: 200px; height: 200px; border-radius: 16px; background: var(--card); border: 1px dashed rgba(73, 88, 78, 0.35); display: flex; align-items: center; justify-content: center; color: var(--muted); font-size: 15px; padding: 16px; }
.qr p { margin: 10px 0 0; font-size: 16px; color: var(--muted); }

/* 页脚 */
.site-footer { background: var(--green); color: rgba(255, 253, 248, 0.86); padding: 40px 0 34px; font-size: 15px; }
.site-footer a { color: var(--card); }
.site-footer .row { display: flex; flex-wrap: wrap; gap: 10px 26px; margin-bottom: 14px; }
.site-footer .brand-line { display: flex; align-items: center; gap: 12px; margin-bottom: 18px; }
.site-footer .brand-line img { width: 26px; }
.site-footer .brand-line strong { font-family: var(--serif); font-size: 20px; letter-spacing: 3px; color: var(--card); }
.site-footer .placeholder { opacity: 0.7; }

/* 协议页 */
.doc { padding: 40px 0 72px; }
.doc .wrap { max-width: 820px; }
.doc h1 { font-family: var(--serif); font-size: 32px; color: var(--green); margin: 0 0 6px; }
.doc .meta { color: var(--muted); font-size: 15px; margin: 0 0 20px; }
.doc .draft { background: #fbefe9; border: 1px solid rgba(168, 64, 46, 0.3); color: #7c2f22; border-radius: 12px; padding: 14px 18px; margin: 0 0 28px; font-size: 16px; }
.doc h2 { font-family: var(--serif); font-size: 23px; color: var(--ink); margin: 34px 0 10px; }
.doc p, .doc li { font-size: 17px; }
.doc table { width: 100%; border-collapse: collapse; font-size: 16px; margin: 10px 0 16px; background: var(--card); }
.doc th, .doc td { border: 1px solid var(--line); padding: 10px 12px; text-align: left; vertical-align: top; }
.doc th { background: var(--green-soft); color: var(--green); }
.doc .toc { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 14px 20px; }
.doc .toc ol { margin: 0; padding-left: 1.4em; }
@media (max-width: 640px) { .doc table { font-size: 15px; } .doc th, .doc td { padding: 8px; } }

/* 修订痕迹（“写得不对的地方，这样改”与样章一全文） */
del.edit { text-decoration: line-through; text-decoration-thickness: 1.5px; color: #8f3626; background: #fbefe9; border-radius: 3px; padding: 0 2px; }
ins.edit { text-decoration: none; color: #24563a; background: #dcebdc; border-bottom: 2px solid #4f8a62; border-radius: 3px; padding: 0 2px; }
sup.mark { font-family: var(--sans); font-size: 13px; font-weight: 700; color: var(--seal); margin-left: 2px; vertical-align: super; line-height: 0; }
p.edited { text-indent: 2em; }
.legend { display: block; margin-top: 6px; font-size: 16px; }
.edits { display: grid; gap: 16px; margin-bottom: 22px; }
.edit-item { display: grid; gap: 0; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.alt .edit-item { background: var(--paper); }
@media (min-width: 900px) { .edit-item { grid-template-columns: 1.35fr 1fr; } }
.edit-item .excerpt { padding: 20px 22px; font-family: var(--serif); }
.edit-item .excerpt p { font-size: 17px; line-height: 2; margin: 0 0 8px; text-indent: 2em; }
.edit-item .excerpt p:last-child { margin-bottom: 0; }
.edit-item .note { position: relative; padding: 20px 22px 20px 62px; background: rgba(231, 238, 230, 0.55); border-top: 1px solid var(--line); }
@media (min-width: 900px) { .edit-item .note { border-top: 0; border-left: 1px solid var(--line); } }
.edit-item .note .num { position: absolute; left: 20px; top: 20px; width: 28px; height: 28px; border-radius: 50%; background: var(--seal); color: #fff; font-size: 15px; font-weight: 700; display: flex; align-items: center; justify-content: center; }
.edit-item .note p { margin: 0 0 6px; font-size: 16px; color: var(--ink); }
.edit-item .note p.why { color: var(--muted); }
.edit-item .note q { display: block; margin: 8px 0; padding: 8px 12px; border-left: 3px solid var(--gold); background: var(--card); font-family: var(--serif); quotes: none; color: var(--ink); }