:root{--sky:#38bdf8;--sky-deep:#0ea5e9;--ink:#0f172a;--muted:#64748b;--line:#e2e8f0;--yellow:#f59e0b;}
  *{box-sizing:border-box;}
  html,body{margin:0;padding:0;}
  /* 固定视口高度：页头、分类、标签栏各自固定，文章列表（b2）在内部滚动，
     下沿始终邻近区域4 */
  body{height:100vh;overflow:hidden;display:flex;flex-direction:column;background:#f1f5f9;color:var(--ink);
    font-family: "Microsoft YaHei", "PingFang SC", "Hiragino Sans GB", system-ui, -apple-system, "Segoe UI", sans-serif;}

  /* 区域编号 */
  .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;}
  .cap{position:absolute;top:4px;left:12px;z-index:6;font-size:11px;font-weight:700;letter-spacing:.08em;color:#94a3b8;pointer-events:none;}
  .toast{position:fixed;left:50%;top:108px;transform:translate(-50%,-14px);z-index:99;background:rgba(15,23,42,.92);
    color:#fff;font-size:13px;padding:10px 18px;border-radius:16px;opacity:0;pointer-events:none;transition:.25s;
    max-width:min(92vw,560px);text-align:center;line-height:1.5;word-break:break-word;box-shadow:0 10px 30px rgba(15,23,42,.28);}
  .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;cursor:pointer;}
  .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;}

  /* ---------- 主区：b1 | b2 | b3 ---------- */
  .main{flex:1;display:flex;align-items:stretch;gap:22px;padding:22px 26px;min-height:0;}

  /* b1 分类菜单：只有文本，没有框；点击范围就是文字本身 */
  .b1{flex:0 0 132px;align-self:flex-start;display:flex;flex-direction:column;align-items:flex-start;gap:16px;
    position:sticky;top:118px;padding-top:4px;}
  .b1 .b1cap{font-size:11px;font-weight:700;letter-spacing:.08em;color:#94a3b8;margin-bottom:2px;}
  .b1 button{
    position:relative;font:inherit;font-size:15px;font-weight:700;cursor:pointer;
    border:0;background:none;padding:0;color:#64748b;transition:.18s;white-space:nowrap;
  }
  .b1 button:hover{color:var(--sky-deep);}
  .b1 button.on{color:var(--sky-deep);}
  .b1 button.on::after{content:"";position:absolute;left:0;right:0;bottom:-5px;height:2px;
    border-radius:2px;background:var(--sky);}

  /* b2 文章列表：纵向拉满，下沿邻近区域4 */
  .b2{flex:1;min-width:0;display:flex;gap:10px;align-self:stretch;}
  .b2-scroll{flex:1;min-width:0;overflow-y:auto;padding-right:6px;
    display:flex;flex-direction:column;gap:16px;
    scrollbar-width:none;-ms-overflow-style:none;}   /* 隐藏原生滚动条：只保留 b2.block 滑块 */
  .b2-scroll::-webkit-scrollbar{width:0;height:0;}
  .b2-head{font-size:13px;color:var(--muted);display:flex;justify-content:space-between;align-items:center;}
  .b2-head b{color:var(--ink);}

  /* b2 外围不加框：文章行只用白底 + 浅分隔线，不再画卡片框 */
  .row{position:relative;display:grid;grid-template-columns:200px 116px 1fr;gap:14px;background:#fff;
    border:1px solid var(--line);border-radius:12px;padding:14px;transition:.18s;}
  .row:hover{border-color:var(--sky);box-shadow:0 8px 20px rgba(15,23,42,.08);}
  .b21{position:relative;border-radius:9px;min-height:132px;cursor:pointer;}
  /* b2.x.2 作者头像 + b2.x.3 作者名/收藏 */
  .b2mid{position:relative;display:flex;flex-direction:column;align-items:center;gap:8px;justify-content:center;}
  .b2mid .ava{width:56px;height:56px;border-radius:50%;border:2px solid var(--line);
    background:linear-gradient(135deg,#f8fafc,#e2e8f0);display:grid;place-items:center;font-size:24px;
    text-decoration:none;color:var(--ink);cursor:pointer;transition:.18s;}
  .b2mid .ava:hover{border-color:var(--sky);}
  .b2mid .nm{font-size:12px;color:#334155;background:#f1f5f9;border:1px solid var(--line);border-radius:6px;
    padding:2px 8px;display:flex;align-items:center;gap:6px;}
  .b2mid .nm a{color:inherit;text-decoration:none;font-weight:700;}
  .b2mid .nm a:hover{color:var(--sky-deep);text-decoration:underline;}
  .star{cursor:pointer;font-size:15px;line-height:1;color:#cbd5e1;transition:.18s;user-select:none;}
  .star:hover{transform:scale(1.15);}
  .star.on{color:var(--yellow);}
  /* b2.x.4 标题 + 内容(100字) + 分享 */
  .b24{position:relative;display:flex;flex-direction:column;gap:8px;min-width:0;cursor:pointer;}
  .b24 h3{margin:0;font-size:17px;line-height:1.4;}
  .b24 h3:hover{text-decoration:underline;}
  .b24 p{margin:0;font-size:13px;line-height:1.8;color:#475569;}
  .b24 .ft{margin-top:auto;display:flex;align-items:center;gap:10px;}
  .meta{font-size:11px;color:var(--muted);}
  /* 分享：不要框，只有文本，点击文字即复制链接 */
  .share{position:relative;margin-left:auto;font-size:12px;font-weight:700;color:#0369a1;background:#e0f2fe;
    border:1px solid #bae6fd;border-radius:999px;padding:4px 12px;cursor:pointer;transition:.18s;}
  .share:hover{background:var(--sky);border-color:var(--sky);color:#fff;}

  /* b2.block 滑块 */
  .slider{flex:0 0 16px;position:relative;border-radius:999px;background:#e2e8f0;touch-action:none;}
  .slider .thumb{position:absolute;left:0;top:0;width:16px;border-radius:999px;background:var(--sky);
    cursor:grab;box-shadow:0 2px 6px rgba(15,23,42,.2);transition:background .18s;}
  .slider .thumb:hover{background:var(--sky-deep);}
  .slider .thumb:active{cursor:grabbing;}

  /* b3 右侧固定栏 */
  .b3{flex:0 0 210px;align-self:flex-start;display:flex;flex-direction:column;gap:14px;position:sticky;top:118px;}
  /* b3.1 只是右侧的背景，不显示任何边框/底色/文字 */
  .b31{position:relative;height:260px;background:transparent;border:0;}
  .b32{position:relative;background:#fff;border:1px solid var(--line);border-radius:12px;padding:14px;}
  .b32 h4{margin:0 0 10px;font-size:12px;color:var(--sky-deep);letter-spacing:.08em;}
  .tags{display:flex;flex-wrap:wrap;gap:8px;}
  .tag{font-size:12px;color:#0369a1;background:#e0f2fe;border-radius:999px;padding:5px 12px;}
  .empty{font-size:13px;color:var(--muted);text-align:center;padding:26px 10px;line-height:1.8;}

  /* ---------- 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;}

/* ================= 移动端适配（搜索页） ================= */
@media (max-width: 1024px) {
  body { height: auto !important; overflow: auto !important; }   /* 手机上整页滚动 */
  .main { flex-direction: column; padding: 12px; gap: 12px; }
  .b1 { flex: 0 0 auto; position: static; flex-direction: row; flex-wrap: wrap; align-items: center; gap: 16px; padding: 0; }
  .b1cap { width: 100%; margin: 0; }
  .b2 { align-self: stretch; flex-direction: column; }
  .b2-scroll { max-height: none; height: auto; overflow: visible; padding-right: 0; gap: 12px; }
  .slider { display: none; }                 /* 手机用触摸滚动，收起滑块 */
  .row { grid-template-columns: 1fr; gap: 10px; padding: 12px; }
  .b21 { height: 170px; border-radius: 10px; }
  .b2mid { flex-direction: row; align-items: center; gap: 10px; }
  .b2mid .ava { width: 40px; height: 40px; font-size: 18px; }
  .b3 { position: static; align-self: stretch; flex-direction: row; align-items: center; gap: 10px; }
  .b31 { display: none; }                    /* 空白背景条手机端不需要 */
  .b32 { flex: 1; }
}
@media (max-width: 768px) {
  .b21 { height: 150px; }
  .row h3 { font-size: 16px; }
  .row p { font-size: 13px; -webkit-line-clamp: 4; }
}


/* ================= 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: 768px) {
  .r1 { padding: 8px 10px; gap: 8px; }
  .r1 .sitname { font-size: 17px; }
  .r1 .search { padding-left: 12px; }
  .r4 { font-size: 12px; }
}


/* --- 手机端修正：作者信息左对齐 --- */
@media (max-width: 1024px) {
  .b2mid { justify-content: flex-start; }
  .b2mid .nm { justify-content: flex-start; }
}


/* ================= 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; }
}