:root{
  --bg:#f4f7fb;
  --card:#ffffff;
  --ink:#1f2a37;
  --muted:#6b7280;
  --line:#e6ebf2;
  --sky:#3b82f6;
  --sky-soft:#eaf2ff;
  --green:#10b981;
  --green-soft:#e7f8f1;
  --orange:#f59e0b;
  --orange-soft:#fef3e2;
  --purple:#8b5cf6;
  --purple-soft:#f3edff;
  --pink:#ec4899;
  --shadow:0 4px 18px rgba(31,42,55,.07);
  --radius:16px;
}
*{box-sizing:border-box;}
body{
  margin:0;font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",system-ui,sans-serif;
  background:var(--bg);color:var(--ink);line-height:1.6;
}
a{color:inherit;text-decoration:none;}

/* 顶栏 */
.topbar{
  display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;
  padding:18px 24px;background:linear-gradient(120deg,#4f7cff,#6a5cff);
  color:#fff;box-shadow:var(--shadow);
}
.brand{display:flex;align-items:center;gap:14px;}
.logo{font-size:38px;line-height:1;}
.brand-text h1{margin:0;font-size:22px;font-weight:800;letter-spacing:.5px;}
.brand-text p{margin:2px 0 0;font-size:13px;opacity:.92;}
.stats{display:flex;gap:10px;flex-wrap:wrap;}
.stat{
  background:rgba(255,255,255,.16);border:1px solid rgba(255,255,255,.25);
  border-radius:12px;padding:8px 14px;text-align:center;min-width:76px;backdrop-filter:blur(4px);
}
.stat-num{display:block;font-size:20px;font-weight:800;line-height:1.1;}
.stat-label{font-size:11px;opacity:.9;}

/* 概览条 */
.summary{
  display:flex;gap:12px;flex-wrap:wrap;padding:14px 24px 0;justify-content:center;
}
.sum-card{
  background:var(--card);border:1px solid var(--line);border-radius:14px;
  padding:10px 18px;text-align:center;box-shadow:var(--shadow);min-width:110px;
}
.sum-card .n{font-size:22px;font-weight:800;}
.sum-card .t{font-size:12px;color:var(--muted);}

/* 容器 */
.container{max-width:1180px;margin:0 auto;padding:18px 20px 40px;}
.toolbar{display:flex;gap:12px;flex-wrap:wrap;align-items:center;margin:14px 0;}
.search-wrap{flex:1;min-width:240px;}
#searchInput{
  width:100%;padding:12px 16px;border:1px solid var(--line);border-radius:12px;
  font-size:15px;background:#fff;outline:none;transition:.15s;
}
#searchInput:focus{border-color:var(--sky);box-shadow:0 0 0 3px var(--sky-soft);}
.sort-wrap{display:flex;align-items:center;gap:6px;color:var(--muted);font-size:14px;}
#sortSelect{padding:10px 12px;border:1px solid var(--line);border-radius:10px;background:#fff;font-size:14px;}

/* 筛选 */
.filters{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:14px 16px;box-shadow:var(--shadow);margin-bottom:12px;}
.filter-group{margin-bottom:10px;}
.filter-group:last-child{margin-bottom:0;}
.filter-title{font-size:13px;color:var(--muted);font-weight:700;margin-bottom:6px;}
.chips{display:flex;gap:8px;flex-wrap:wrap;}
.chip{
  padding:6px 14px;border-radius:999px;border:1px solid var(--line);background:#fff;
  font-size:13px;cursor:pointer;transition:.12s;user-select:none;color:var(--ink);
}
.chip:hover{border-color:var(--sky);color:var(--sky);}
.chip.active{background:var(--sky);border-color:var(--sky);color:#fff;font-weight:700;}
.chip .c{opacity:.65;font-size:11px;margin-left:4px;}

.result-info{display:flex;align-items:center;justify-content:space-between;padding:6px 2px;color:var(--muted);font-size:13px;}
.link-btn{background:none;border:none;color:var(--sky);cursor:pointer;font-size:13px;}

/* 卡片网格 */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:14px;margin-top:10px;}
.card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:14px;box-shadow:var(--shadow);display:flex;flex-direction:column;gap:10px;
  transition:.15s;position:relative;overflow:hidden;
}
.card:hover{transform:translateY(-3px);box-shadow:0 10px 26px rgba(31,42,55,.12);}
.card .badges{display:flex;gap:6px;flex-wrap:wrap;}
.tag{font-size:11px;padding:3px 9px;border-radius:999px;font-weight:700;}
.tag-subject{background:var(--sky-soft);color:var(--sky);}
.tag-grade{background:var(--purple-soft);color:var(--purple);}
.tag-type{background:var(--orange-soft);color:var(--orange);}
.tag-edit{background:#eef2f7;color:var(--muted);}
.card h3{margin:0;font-size:15.5px;font-weight:700;line-height:1.45;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.card .meta{font-size:12px;color:var(--muted);display:flex;justify-content:space-between;align-items:center;}
.ext-badge{font-size:11px;font-weight:800;padding:2px 7px;border-radius:6px;color:#fff;}
.ext-docx{background:#2b7cd3;}
.ext-pdf{background:#e0492f;}
.card .acts{display:flex;gap:8px;margin-top:auto;}
.btn{flex:1;text-align:center;padding:9px 10px;border-radius:10px;font-size:13px;font-weight:700;
  cursor:pointer;border:1px solid transparent;transition:.12s;}
.btn-primary{background:var(--sky);color:#fff;}
.btn-primary:hover{background:#2f6ae0;}
.btn-ghost{background:#fff;border-color:var(--line);color:var(--ink);}
.btn-ghost:hover{border-color:var(--sky);color:var(--sky);}

.empty{text-align:center;color:var(--muted);padding:60px 0;font-size:15px;}

/* 页脚 */
.footer{text-align:center;color:var(--muted);font-size:12px;padding:24px;border-top:1px solid var(--line);}
/* 底部弱化统计（不起眼） */
.stats-bottom{display:flex;gap:16px;justify-content:center;flex-wrap:wrap;margin-bottom:12px;color:var(--muted);font-size:12px;}
.stats-bottom .s b{font-weight:700;color:var(--ink);margin-right:2px;}

/* 弹窗 */
.modal{position:fixed;inset:0;background:rgba(17,24,39,.55);display:none;align-items:center;
  justify-content:center;padding:20px;z-index:50;}
.modal.show{display:flex;}
.modal-box{background:#fff;border-radius:16px;width:min(960px,100%);max-height:92vh;
  display:flex;flex-direction:column;overflow:hidden;box-shadow:0 20px 60px rgba(0,0,0,.3);}
.modal-head{display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding:14px 18px;border-bottom:1px solid var(--line);background:#fafbfe;}
.modal-title{font-weight:800;font-size:16px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}
.modal-actions{display:flex;gap:8px;flex-shrink:0;}
.modal-actions .btn{flex:none;padding:8px 14px;}
.modal-body{overflow:auto;padding:0;background:#525659;}
.loading{padding:80px 0;text-align:center;color:#cbd5e1;font-size:15px;}
.modal-body iframe{width:100%;height:78vh;border:0;background:#fff;}
.doc-preview{padding:26px 30px;background:#fff;max-width:820px;margin:0 auto;min-height:78vh;}
.doc-preview img{max-width:100%;}
.doc-preview h1,.doc-preview h2,.doc-preview h3{color:#1f2a37;}
.doc-error{padding:40px;color:#b91c1c;text-align:center;}

/* ---------- 移动端适配（手机 / 小平板） ---------- */
@media (max-width: 768px) {
  body { overflow-x: hidden; }
  .topbar { padding: 12px 16px; }
  .brand-text h1 { font-size: 18px; }
  .brand-text p { display: none; }

  .container { padding: 12px 12px 32px; }
  .toolbar { flex-direction: column; align-items: stretch; gap: 10px; }
  .search-wrap { min-width: 0; }
  #searchInput, #sortSelect { font-size: 16px; }   /* 16px 防止 iOS 聚焦时自动缩放 */
  .sort-wrap { justify-content: space-between; width: 100%; }
  #sortSelect { flex: 1; }

  .summary { padding: 12px 12px 0; gap: 8px; }
  .sum-card { min-width: 0; flex: 1 1 30%; padding: 8px 10px; }
  .sum-card .n { font-size: 19px; }

  .grid { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 10px; }
  .card { padding: 12px; }
  .card h3 { font-size: 14.5px; }

  /* 操作按钮竖向堆叠：窄屏下更易点按，避免两按钮挤在一行文字折行 */
  .card .acts { flex-direction: column; }
  .btn { width: 100%; padding: 11px 10px; font-size: 14px; }

  .result-info { font-size: 12px; }
  a, button, select, input, .chip { -webkit-tap-highlight-color: transparent; }
}
@media (max-width: 380px) {
  .grid { grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); }
}

/* 页面容器（分栏时整体左移，给右侧预览让位） */
.page{transition:margin-right .22s ease;}
body.split .page{margin-right:62%;}

/* 右侧预览面板（左右分栏） */
.preview-pane{position:fixed;top:0;right:0;bottom:0;width:62%;background:#525659;
  transform:translateX(100%);transition:transform .22s ease;z-index:45;
  display:flex;flex-direction:column;box-shadow:-10px 0 30px rgba(0,0,0,.28);}
body.split .preview-pane{transform:translateX(0);}
.pp-head{display:flex;align-items:center;justify-content:space-between;gap:10px;
  padding:10px 14px;background:#3a3f4b;color:#fff;flex-shrink:0;}
.pp-title{font-weight:700;font-size:14px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}
.pp-tools{display:flex;align-items:center;gap:8px;flex-shrink:0;}
.pp-new{color:#cfe0ff;font-size:13px;text-decoration:none;}
.pp-new:hover{text-decoration:underline;}
.pp-close{background:#fff;color:#333;border:none;border-radius:8px;padding:6px 14px;font-weight:700;cursor:pointer;font-size:13px;}
.pp-close:hover{background:#eaeaea;}
.preview-pane iframe{flex:1;width:100%;border:0;background:#fff;}

/* 移动端：预览面板全屏覆盖，左侧留遮罩可点关 */
.pane-mask{display:none;}
body.split .pane-mask{display:block;position:fixed;inset:0;background:rgba(0,0,0,.35);z-index:44;}
@media(max-width:820px){
  body.split .page{margin-right:0;}
  .preview-pane{width:100%;}
  body.split .pane-mask{display:block;}
}
@media(min-width:821px){
  body.split .pane-mask{display:none;}
}