@font-face {
    font-family: "Playwrite US";
    src: url("fonts/playwrite-us-400-normal.ttf") format("truetype");
    font-weight: 400; font-style: normal; font-display: swap;
  }
  :root {
    --paper: #f7f7f7;
    --ink: #1a1a1a;
    --ink-soft: #5c5c5c;
    --rule: #c9d6ee;          /* 橫線 */
    --margin: #ef7a8a;        /* 紅色邊線 */
    --line: 33px;             /* 行高 = 橫線間距 */
    --rail: 56px;
    --panel: 268px;
    --hand: "Playwrite US", "LXGW WenKai TC", "Kaiti TC", "DFKai-SB", cursive;
  }
  * { box-sizing: border-box; }
  html, body { margin: 0; }
  body {
    min-height: 100vh;
    background-color: var(--paper);
    background-image: linear-gradient(to bottom, transparent calc(var(--line) - 1px), var(--rule) calc(var(--line) - 1px));
    background-size: 100% var(--line);
    color: var(--ink);
    font-family: var(--hand);
    font-size: 18px;
    line-height: var(--line);
    -webkit-font-smoothing: antialiased;
    text-rendering: geometricPrecision;
  }
  a { color: var(--ink); text-decoration-thickness: 1px; text-underline-offset: .15em; }
  button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
  svg { display: block; }

  /* ---------- 側欄 ---------- */
  .side {
    position: fixed; inset: 0 auto 0 0; z-index: 20;
    width: var(--rail);
    background: var(--paper);
    border-right: 1.5px solid var(--margin);
    display: flex; flex-direction: column;
    transition: width .22s ease;
    overflow: hidden;
  }
  body.open .side { width: var(--panel); }
  .side-top { display: flex; align-items: center; gap: 10px; height: var(--line); margin: var(--line) 0 var(--line); padding: 0 8px; }
  .icon-btn {
    width: 40px; height: 40px; flex: none; border-radius: 10px;
    display: grid; place-items: center;
  }
  .icon-btn:hover, .cat-head:hover, .item:hover { background: rgba(0,0,0,.06); }
  .brand { white-space: nowrap; font-size: 16px; opacity: 0; transition: opacity .15s; }
  body.open .brand { opacity: 1; }

  nav.cats { flex: 1; overflow-y: auto; overflow-x: hidden; padding: 0 8px; }
  .cat { margin-bottom: 4px; }
  .cat-head {
    width: 100%; display: flex; text-decoration: none; margin-bottom: 4px; align-items: center; gap: 10px;
    height: 40px; padding: 0 8px; border-radius: 10px; text-align: left; white-space: nowrap;
  }
  .cat-head svg.ic { width: 24px; height: 24px; flex: none; }
  .cat-name { flex: 1; font-size: 15px; opacity: 0; transition: opacity .15s; }
  .chev { width: 16px; height: 16px; flex: none; opacity: 0; transition: transform .2s, opacity .15s; }
  body.open .cat-name, body.open .chev { opacity: 1; }
  .cat.expanded .chev { transform: rotate(90deg); }
  .cat-items { display: none; padding: 2px 0 6px 42px; }
  body.open .cat.expanded .cat-items { display: block; }
  .item {
    display: block; padding: 4px 10px; border-radius: 8px; font-size: 14px; line-height: 1.5;
    text-decoration: none; white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  }
  .empty { padding: 4px 10px; font-size: 13px; line-height: 1.5; color: var(--ink-soft); }
  .side-foot { padding: 12px 16px; font-size: 12px; line-height: 1.5; color: var(--ink-soft); white-space: nowrap; opacity: 0; transition: opacity .15s; }
  body.open .side-foot { opacity: 1; }

  .scrim { display: none; }

  /* ---------- 主內容 ---------- */
  main {
    margin-left: var(--rail);
    padding: var(--line) 48px calc(var(--line) * 3);
    transition: margin-left .22s ease;
  }
  body.open main { margin-left: var(--panel); }
  .page { max-width: 720px; margin: 0 auto; }
  header.mast { margin: 0 0 calc(var(--line) * 2); }
  h1 {
    font-weight: 400; font-size: 44px; line-height: calc(var(--line) * 2);
    margin: 0;
  }
  .tagline { margin: 0; color: var(--ink-soft); }
  .dots { border: 0; border-top: 2px dotted var(--ink); width: 240px; margin: calc(var(--line) - 1px) 0 0; }

  section.notes h2 { font-weight: 400; font-size: 22px; margin: 0 0 var(--line); }
  .note-empty { margin: 0; color: var(--ink-soft); }
  .doodle { display: block; width: 120px; margin: calc(var(--line) * 2) 0 0 auto; opacity: .9; }

  /* ---------- 手機 ---------- */
  .mobile-bar { display: none; }
  @media (max-width: 760px) {
    .side { width: var(--panel); transform: translateX(-100%); transition: transform .22s ease; }
    body.open .side { transform: none; }
    body.open .scrim { display: block; position: fixed; inset: 0; z-index: 15; background: rgba(0,0,0,.25); }
    .brand, .cat-name, .chev, .side-foot { opacity: 1; }
    main, body.open main { margin-left: 0; padding: 0 16px calc(var(--line) * 3); }
    .mobile-bar { display: flex; align-items: center; height: calc(var(--line) * 2); }
    h1 { font-size: 34px; }
  }

/* ---------- 文章列表 ---------- */
.post-list { list-style: none; margin: 0; padding: 0; }
.post-list li { margin: 0 0 var(--line); }
.post-list a.title { font-size: 22px; text-decoration: none; }
.post-list a.title:hover { text-decoration: underline; }
.meta { color: var(--ink-soft); font-size: 14px; margin: 0; }
.excerpt { margin: 0; }

/* ---------- 單篇文章 ---------- */
article.post h1 { font-size: 36px; line-height: calc(var(--line) * 2); }
article.post .meta { margin-bottom: var(--line); }
.post-body p, .post-body ul, .post-body ol, .post-body blockquote { margin: 0 0 var(--line); }
.post-body h2, .post-body h3 { font-weight: 400; margin: var(--line) 0; line-height: var(--line); }
.post-body h2 { font-size: 24px; }
.post-body h3 { font-size: 20px; }
.post-body img { max-width: 100%; height: auto; display: block; margin: 0 0 var(--line); }
.post-body blockquote { border-left: 2px solid var(--ink); padding-left: 16px; color: var(--ink-soft); }
.post-body pre { overflow-x: auto; font-size: 14px; background: rgba(255,255,255,.7); padding: 0 12px; }
.post-foot { display: flex; justify-content: space-between; align-items: center; margin-top: var(--line); font-size: 15px; }
.edit-link { color: var(--ink-soft); }

/* ---------- 清單頁 ---------- */
.cat-section { margin-bottom: calc(var(--line) * 2); }
.cat-label { font-weight: 400; font-size: 22px; margin: 0 0 var(--line); }
.cat-head.active { background: rgba(0,0,0,.08); }
.nav-sep { height: 1px; background: var(--rule); margin: 8px 8px 12px; }

/* ---------- 工具小卡 ---------- */
.tool-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: var(--line) 20px; }
.tool-card {
  background: #fff; border: 1.5px solid var(--ink); border-radius: 12px;
  padding: 16px 18px 12px; min-height: calc(var(--line) * 4);
  display: flex; flex-direction: column; justify-content: space-between;
  box-shadow: 3px 3px 0 var(--ink); transition: transform .12s, box-shadow .12s;
}
.tool-card:hover { transform: translate(-1px,-1px); box-shadow: 4px 4px 0 var(--ink); }
.tool-name { font-size: 18px; line-height: 1.5; }
.tool-links { display: flex; justify-content: space-between; font-size: 13px; line-height: 1.5; margin-top: 16px; }
.tool-links a { color: var(--ink-soft); }
.tool-links a:hover { color: var(--ink); }
.tool-btn {
  display: inline-block; border: 1.5px solid var(--ink); border-radius: 999px;
  padding: 0 16px; line-height: 30px; text-decoration: none; background: #fff; font-size: 15px;
}
.tool-btn:hover { background: var(--ink); color: var(--paper); }

/* ---------- 便條紙文章卡 ---------- */
.note-grid {
  list-style: none; margin: 0; padding: 0;
  display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 20px;
}
.note-card { --fold: 26px; --bw: 3px; position: relative; }
.note-card a {
  position: relative; display: flex; flex-direction: column; gap: 6px;
  min-height: 150px; height: 100%; padding: 18px 20px calc(var(--fold) + 6px);
  background: #fff; border: var(--bw) solid var(--ink); text-decoration: none;
  line-height: 1.55;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--fold)), calc(100% - var(--fold)) 100%, 0 100%);
  transition: transform .12s;
}
/* 折角 */
.note-card a::after {
  content: ""; position: absolute;
  right: calc(var(--bw) * -1); bottom: calc(var(--bw) * -1);
  width: var(--fold); height: var(--fold);
  border-top: var(--bw) solid var(--ink); border-left: var(--bw) solid var(--ink);
  box-sizing: border-box; background-origin: border-box;
  background-image: linear-gradient(to bottom right,
    #fff calc(50% - 2.5px), var(--ink) calc(50% - 2.5px),
    var(--ink) calc(50% + 2px), transparent calc(50% + 2px));
}
.note-card a:hover { transform: translateY(-2px); }
.note-card a:hover .nc-title { text-decoration: underline; text-underline-offset: .15em; }
.nc-title { font-size: 19px; }
.nc-meta { font-size: 13px; color: var(--ink-soft); }
.nc-excerpt { font-size: 14px; color: var(--ink-soft); }

/* ---------- 頁碼 ---------- */
.pager { display: flex; flex-wrap: wrap; justify-content: center; gap: 6px; margin: var(--line) 0 0; }
.pager button {
  min-width: 34px; height: 34px; padding: 0 8px; border-radius: 8px;
  font-size: 15px; line-height: 1;
}
.pager button:hover:not([disabled]) { background: rgba(0,0,0,.06); }
.pager button[aria-current="page"] { border: 2px solid var(--ink); }
.pager button[disabled] { opacity: .3; cursor: default; }

[hidden] { display: none !important; }