/* 忆栈官网 · 水墨米色风 · 移动优先 */
* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --paper: #f7f2e7;
  --paper-deep: #efe7d5;
  --ink: #3d3a33;
  --ink-soft: #6f6a5e;
  --green: #5d8276;
  --green-deep: #43695e;
  --line: #d9cfb8;
}

html { -webkit-text-size-adjust: 100%; }

body {
  font-family: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", serif;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.85;
  font-size: 16px;
}

a { color: var(--green-deep); text-decoration: none; }

/* 顶部导航 */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 18px;
  border-bottom: 1px solid var(--line);
  background: rgba(247, 242, 231, 0.96);
  position: sticky;
  top: 0;
  z-index: 10;
}
.topbar .brand { display: flex; align-items: center; gap: 8px; font-size: 18px; letter-spacing: 4px; color: var(--green-deep); font-weight: 600; }
.topbar .brand img { width: 30px; height: 30px; border-radius: 50%; object-fit: cover; }
.topbar nav { display: flex; gap: 14px; font-size: 14px; }
.topbar nav a { color: var(--ink-soft); }
.topbar nav a:hover { color: var(--green-deep); }

/* 首屏 */
.hero {
  text-align: center;
  padding: 46px 20px 34px;
  background: linear-gradient(180deg, var(--paper) 0%, var(--paper-deep) 100%);
}
.hero img.emblem { width: 190px; height: auto; margin-bottom: 14px; }
.hero h1 { font-size: 26px; letter-spacing: 8px; color: var(--green-deep); font-weight: 600; }
.hero .slogan { margin-top: 8px; font-size: 16px; letter-spacing: 6px; color: var(--ink-soft); }
.hero .sub { margin-top: 14px; font-size: 14px; color: var(--ink-soft); }

/* 版块 */
main { max-width: 780px; margin: 0 auto; padding: 0 18px 30px; }
section.block { margin: 26px 0; }
section.block > h2 {
  font-size: 20px;
  color: var(--green-deep);
  letter-spacing: 3px;
  margin-bottom: 14px;
  padding-left: 10px;
  border-left: 4px solid var(--green);
}

/* 功能卡片 */
.cards { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (max-width: 480px) { .cards { grid-template-columns: 1fr; } }
.card {
  background: #fffdf7;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px 16px 12px;
}
.card h3 { font-size: 17px; color: var(--ink); margin-bottom: 6px; letter-spacing: 1px; }
.card p { font-size: 14px; color: var(--ink-soft); line-height: 1.75; }

/* 文章页 */
article.doc { max-width: 780px; margin: 0 auto; padding: 26px 18px 30px; }
article.doc h1 { font-size: 24px; line-height: 1.5; color: var(--ink); margin-bottom: 6px; }
article.doc .meta { font-size: 13px; color: #9a927f; margin-bottom: 18px; }
article.doc h2 { font-size: 19px; color: var(--green-deep); margin: 26px 0 10px; letter-spacing: 1px; }
article.doc h3 { font-size: 16px; margin: 18px 0 8px; }
article.doc p, article.doc li { font-size: 15.5px; }
article.doc ul, article.doc ol { padding-left: 22px; margin: 8px 0; }
article.doc .answer {
  background: #eef3ec;
  border-left: 4px solid var(--green);
  padding: 12px 14px;
  border-radius: 0 8px 8px 0;
  margin: 14px 0 18px;
  font-size: 15.5px;
}
article.doc table { width: 100%; border-collapse: collapse; margin: 12px 0; font-size: 14px; }
article.doc th, article.doc td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; vertical-align: top; }
article.doc th { background: var(--paper-deep); }
article.doc .ref { margin-top: 22px; padding-top: 12px; border-top: 1px dashed var(--line); font-size: 13px; color: #9a927f; }

/* FAQ */
.faq-item { background: #fffdf7; border: 1px solid var(--line); border-radius: 8px; padding: 14px 16px; margin-bottom: 12px; }
.faq-item h2 { font-size: 17px; color: var(--ink); margin-bottom: 8px; letter-spacing: 0.5px; }
.faq-item p { font-size: 15px; color: var(--ink-soft); }
.faq-item p + p { margin-top: 6px; }

/* 二维码引导 */
.qr-guide {
  max-width: 780px;
  margin: 30px auto 0;
  padding: 22px 18px 26px;
  background: var(--paper-deep);
  border-top: 1px solid var(--line);
  display: flex;
  align-items: center;
  gap: 18px;
  justify-content: center;
  flex-wrap: wrap;
  text-align: center;
}
.qr-guide img { width: 118px; height: 118px; border-radius: 6px; border: 4px solid #fff; }
.qr-guide .txt { text-align: left; }
.qr-guide .txt .t1 { font-size: 17px; color: var(--green-deep); letter-spacing: 2px; margin-bottom: 6px; font-weight: 600; }
.qr-guide .txt .t2 { font-size: 14px; color: var(--ink-soft); }
.qr-guide .txt .t3 { font-size: 13px; color: #9a927f; margin-top: 6px; }

/* 页脚 */
footer { text-align: center; font-size: 12.5px; color: #a49b86; padding: 18px 16px 26px; line-height: 2; }
footer a { color: #8a9a8f; }