:root{--sky:#38bdf8;--sky-deep:#0ea5e9;--ink:#0f172a;--muted:#64748b;--line:#e2e8f0;}
  *{box-sizing:border-box;}
  html,body{margin:0;padding:0;}
  body{
    min-height:100vh;display:flex;flex-direction:column;background:#f1f5f9;color:var(--ink);
    font-family:"Noto Sans JP","Microsoft YaHei","PingFang SC",system-ui,-apple-system,sans-serif;
  }

  .chip{position:absolute;top:-9px;right:-6px;z-index:6;font-size:10px;line-height:1;font-weight:700;color:#0369a1;
    background:#e0f2fe;border-radius:4px;padding:2px 4px;pointer-events:none;white-space:nowrap;}
  .toast{position:fixed;left:50%;bottom:32px;transform:translate(-50%,14px);z-index:99;background:rgba(15,23,42,.92);
    color:#fff;font-size:13px;padding:9px 18px;border-radius:999px;opacity:0;pointer-events:none;transition:.25s;max-width:80vw;}
  .toast.on{opacity:1;transform:translate(-50%,0);}

  /* ---------- 区域1 页头 ---------- */
  .r1{position:sticky;top:0;z-index:40;height:96px;flex:0 0 96px;display:flex;align-items:center;gap:14px;
    padding:0 26px;background:#fff;border-bottom:1px solid var(--line);}
  .r1 .logo{width:60px;height:60px;border-radius:12px;border:1px solid var(--line);display:grid;place-items:center;
    font-weight:900;color:var(--sky-deep);font-size:20px;flex:0 0 60px;text-decoration:none;position:relative;}
  .r1 .logo:hover{border-color:var(--sky);}
  .r1 .sitname{font-weight:900;font-size:26px;letter-spacing:.04em;white-space:nowrap;color:var(--ink);
    text-decoration:none;position:relative;padding:4px 8px;}
  .r1 .sitname:hover{color:var(--sky-deep);}
  .r1 .search{flex:1;display:flex;align-items:center;gap:8px;padding:6px 8px 6px 18px;background:#f8fafc;
    border:1px solid var(--line);border-radius:999px;position:relative;}
  .r1 .search input{border:0;outline:0;flex:1;font:inherit;font-size:14px;background:transparent;color:var(--ink);}
  .r1 .search button{border:0;border-radius:999px;background:var(--sky);color:#fff;font:inherit;font-weight:700;padding:8px 20px;cursor:pointer;}
  .r1 .search button:hover{background:var(--sky-deep);}
  .r1 .user{display:flex;flex-direction:column;align-items:center;gap:4px;margin-left:6px;}
  .r1 .avatar{width:54px;height:54px;border-radius:50%;border:2px solid var(--line);
    background:linear-gradient(135deg,#f8fafc,#e2e8f0);display:grid;place-items:center;font-size:22px;
    cursor:pointer;text-decoration:none;position:relative;color:var(--ink);}
  .r1 .uname{font-size:12px;color:#334155;background:#f1f5f9;border:1px solid var(--line);border-radius:6px;
    padding:2px 8px;cursor:pointer;text-decoration:none;position:relative;}
  .r1 .uname:hover{background:var(--sky);border-color:var(--sky);color:#fff;}

  /* ---------- 文章正文：居中，左右留出距离 ---------- */
  .wrap{flex:1;display:flex;justify-content:center;align-items:flex-start;padding:28px 26px 44px;}
  .paper{
    width:min(880px, 100%);                 /* 距离左右两边一定距离 */
    background:#fff;border:1px solid var(--line);border-radius:16px;
    padding:48px 66px 34px;box-shadow:0 8px 24px rgba(15,23,42,.06);
  }
  .paper h1{margin:0 0 30px;font-size:30px;font-weight:900;line-height:1.45;text-align:center;}  /* 标题居中 */
  .paper p{margin:0 0 20px;font-size:15.5px;line-height:2.05;color:#1f2937;}
  .paper p:last-of-type{margin-bottom:0;}

  /* 3. 文章底部右下角：作者头像 + 作者名（可点击进入作者主页） */
  .author-row{display:flex;justify-content:flex-end;margin-top:30px;padding-top:20px;border-top:1px solid var(--line);}
  .author{position:relative;display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);
    padding:6px 10px;border-radius:999px;transition:.18s;}
  .author:hover{background:#e0f2fe;}
  .author .face{width:46px;height:46px;border-radius:50%;border:2px solid var(--line);
    background:linear-gradient(135deg,#f8fafc,#e2e8f0);display:grid;place-items:center;font-size:21px;flex:0 0 46px;}
  .author .name{font-size:14px;font-weight:700;}
  .author:hover .name{color:var(--sky-deep);text-decoration:underline;}

  /* 4. 最底部：发表时间，居中 */
  .pubtime{margin-top:18px;text-align:center;font-size:12.5px;color:var(--muted);}

  .empty{width:min(880px,100%);background:#fff;border:1px solid var(--line);border-radius:16px;
    padding:70px 30px;text-align:center;color:var(--muted);font-size:14px;line-height:2;}
  .empty a{color:var(--sky-deep);font-weight:700;text-decoration:none;}

  /* ---------- 区域4 页脚 ---------- */
  .r4{flex:0 0 auto;display:flex;align-items:center;gap:20px;padding:16px 26px;background:#fff;border-top:1px solid var(--line);}
  .r4 .logo{width:42px;height:42px;border-radius:9px;border:1px solid var(--line);display:grid;place-items:center;font-weight:900;color:var(--sky-deep);font-size:15px;flex:0 0 42px;text-decoration:none;}
  .r4 .sitname{font-size:17px;font-weight:900;text-decoration:none;color:var(--ink);}
  .r4 .beian{flex:1;font-size:12px;color:#475569;text-align:center;background:#f8fafc;border:1px solid var(--line);border-radius:9px;padding:10px;line-height:1.6;}
  .r4 .contact{font-size:12px;color:#475569;text-align:right;line-height:1.7;background:#f8fafc;border:1px solid var(--line);border-radius:9px;padding:10px 12px;}

  @media (max-width:760px){
    .paper{padding:32px 26px 26px;}
    .paper h1{font-size:23px;}
  }

/* ================= 移动端适配（文章页） ================= */
@media (max-width: 768px) {
  .wrap { padding: 12px; }
  .paper { padding: 22px 18px 20px; border-radius: 12px; }
  .paper h1 { font-size: 22px; margin-bottom: 18px; }
  .paper p { font-size: 15px; line-height: 1.95; }
  .author .face { width: 36px; height: 36px; font-size: 17px; }
  .author .name { font-size: 13px; }
  .pubtime { font-size: 12px; }
}


/* ================= 移动端适配（页眉 / 页脚） ================= */
@media (max-width: 1024px) {
  .r1 { height: auto !important; flex: 0 0 auto !important; flex-wrap: wrap; padding: 10px 14px; gap: 10px; }
  .r1 .logo { width: 46px; height: 46px; flex: 0 0 46px; font-size: 17px; border-radius: 10px; }
  .r1 .sitname { font-size: 20px; padding: 2px 6px; }
  .r1 .search { order: 3; flex: 1 0 100%; padding: 5px 6px 5px 14px; }
  .r1 .search input { font-size: 13.5px; }
  .r1 .search button { padding: 7px 16px; font-size: 13px; }
  .r1 .user { flex-direction: row; align-items: center; gap: 8px; margin-left: auto; }
  .r1 .avatar { width: 40px; height: 40px; font-size: 16px; }
  .r1 .uname { font-size: 11px; padding: 2px 6px; }
  .r4 { flex-wrap: wrap; padding: 14px; gap: 10px; }
  .r4 .logo { font-size: 18px; }
  .r4 .beian { flex: 1 0 100%; order: 3; text-align: left; }
  .r4 .contact { text-align: left; margin-left: auto; }
}
@media (max-width: 480px) {
  .r1 { padding: 8px 10px; gap: 8px; }
  .r1 .sitname { font-size: 17px; }
  .r1 .search { padding-left: 12px; }
  .r4 { font-size: 12px; }
}


/* ================= 移动端兜底：不允许横向溢出 ================= */
@media (max-width: 1024px) {
  html, body { max-width: 100%; overflow-x: hidden; }
  .r1 .search, .r1 .search input { min-width: 0; }
  .r4 { position: relative !important; margin-top: auto; }   /* 手机上页脚跟随内容：用 relative（不能用 static，否则背景层会铺满整页） */        /* 手机上页脚跟随内容，不吸在屏幕底部 */
  .r4 .beian, .r4 .contact { overflow-wrap: anywhere; }
  .card, .cards, .panel, .col, .row, .item, .msg, .post, .c13, .b2-scroll { min-width: 0; }
  .card .meta .t, .wall .msg, .post .ttl, .row h3, .row p,
  .card .cover .c-title, .paper h1 { overflow-wrap: anywhere; word-break: break-word; }
}

/* ================= 评论区（文章页底部） ================= */
.cmt-card{
  width:min(880px,100%);background:#fff;border:1px solid var(--line);border-radius:16px;
  padding:34px 44px 30px;box-shadow:0 8px 24px rgba(15,23,42,.06);
}
.cmt-title{margin:0 0 18px;font-size:20px;font-weight:900;color:var(--ink);}
.cmt-num{font-size:14px;color:var(--muted);font-weight:700;}
.cmt-form-title{margin:26px 0 10px;font-size:15px;color:var(--sky-deep);letter-spacing:.06em;}
.cmt-empty,.cmt-closed{font-size:13.5px;color:var(--muted);line-height:1.9;margin:0;}
.cmt-closed a{color:var(--sky-deep);text-decoration:none;}
.cmt-closed a:hover{text-decoration:underline;}
.cmt-logged{margin:0 0 10px;font-size:12.5px;color:var(--muted);}
.cmt-logged b{color:var(--ink);}
.cmt-note{margin:10px 0 0;font-size:12px;color:var(--muted);}

.comment-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:12px;}
.comment-list .children{list-style:none;margin:12px 0 0 46px;padding:0;display:flex;flex-direction:column;gap:12px;}
.cmt-item{background:#f8fafc;border:1px solid var(--line);border-radius:12px;padding:14px 18px;}
.cmt-head{display:flex;align-items:center;flex-wrap:wrap;gap:10px;margin-bottom:8px;}
.cmt-face{
  width:34px;height:34px;flex:0 0 34px;border-radius:50%;border:1px solid var(--line);overflow:hidden;
  background:linear-gradient(135deg,#f8fafc,#e2e8f0);display:grid;place-items:center;font-size:17px;
}
.cmt-face img{width:100%;height:100%;border-radius:50%;object-fit:cover;}
.cmt-name{font-size:13.5px;font-weight:700;color:var(--ink);}
.cmt-lv{font-size:11px;font-weight:700;color:var(--sky-deep);background:#e0f2fe;border-radius:999px;padding:2px 9px;}
.cmt-date{margin-left:auto;font-size:11px;color:var(--muted);}
.cmt-badge{font-size:11px;font-weight:700;color:#b45309;background:#fef3c7;border-radius:999px;padding:2px 9px;}
.cmt-body{font-size:14px;line-height:1.9;color:#1f2937;overflow-wrap:anywhere;}
.cmt-body p{margin:0 0 6px;}
.cmt-body p:last-child{margin-bottom:0;}
.cmt-act{margin-top:8px;}
.cmt-act a{font-size:12px;font-weight:700;color:#0369a1;text-decoration:none;}
.cmt-act a:hover{text-decoration:underline;}

.comment-form{margin-top:6px;}
.comment-form p{margin:0 0 12px;}
.comment-form label{display:block;font-size:13px;font-weight:700;color:#334155;margin-bottom:6px;}
.comment-form textarea,
.comment-form input[type="text"],
.comment-form input[type="email"],
.comment-form input[type="url"]{
  width:100%;font:inherit;font-size:14px;line-height:1.8;padding:11px 14px;color:var(--ink);
  border:1px solid var(--line);background:#f8fafc;border-radius:10px;outline:0;transition:.18s;resize:vertical;
}
.comment-form textarea:focus,
.comment-form input:focus{background:#fff;border-color:var(--sky);box-shadow:0 0 0 4px rgba(56,189,248,.15);}
.form-submit{margin:0;}
.cmt-submit{
  font:inherit;font-weight:700;font-size:14px;border:0;border-radius:999px;cursor:pointer;
  background:var(--sky);color:#fff;padding:10px 28px;transition:.18s;
}
.cmt-submit:hover{background:var(--sky-deep);}

@media (max-width: 768px){
  .cmt-card{padding:20px 16px 18px;border-radius:12px;}
  .cmt-title{font-size:18px;}
  .cmt-item{padding:12px 14px;}
  .comment-list .children{margin-left:20px;}
  .cmt-date{margin-left:0;flex:1 0 100%;order:5;}
  .cmt-submit{width:100%;}
}