:root{
  --green:#1f5c47; --green-dark:#174534; --green-light:#eaf3ef;
  --blue:#3c608f; --blue-pale:#e7eef7; --blue-line:#c8d4e0;
  --sand:#fbf3e0; --sand-line:#ecdcb4;
  --bg:#f6faf8; --white:#fff; --line:#dbe7e1;
  --text:#2b2b2b; --muted:#5c6b64; --red:#c0392b; --warn:#ff6b5e;
  --radius:14px; --shadow:0 6px 24px rgba(31,92,71,.10);
}
*{margin:0;padding:0;box-sizing:border-box}
body{background:var(--bg);color:var(--text);font-family:"Segoe UI",Arial,"Microsoft YaHei",sans-serif;line-height:1.6}
h1,h2,h3{font-family:Georgia,"Times New Roman",serif;color:var(--green)}
a{color:var(--green)}
.container{max-width:1100px;margin:0 auto;padding:28px 20px 60px}
.muted{color:var(--muted)}

/* 顶栏 */
.topbar{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.95);backdrop-filter:blur(6px);border-bottom:1px solid var(--line)}
.topbar-inner{max-width:1100px;margin:0 auto;padding:12px 20px;display:flex;align-items:center;justify-content:space-between}
.brand{font-family:Georgia,serif;font-size:20px;font-weight:700;color:var(--green);text-decoration:none}
.topnav a{margin-left:18px;text-decoration:none;color:var(--muted);font-size:14px}
.topnav a:hover{color:var(--green)}

/* 按钮 */
.btn{display:inline-block;border:none;cursor:pointer;text-decoration:none;border-radius:999px;padding:10px 26px;font-size:15px;transition:.2s}
.btn-primary{background:var(--green);color:#fff}
.btn-primary:hover{background:var(--green-dark)}
.btn-ghost{border:1px solid var(--blue);color:var(--blue);background:transparent}
.btn-ghost:hover{background:var(--blue-pale)}
.btn-danger{background:var(--red);color:#fff}
.btn-big{padding:14px 44px;font-size:17px}

/* 首页 */
.hero{text-align:center;padding:48px 0 30px}
.hero h1{font-size:36px;margin-bottom:10px}
.hero-sub{color:var(--muted);margin-bottom:26px}
.search-capsule{display:flex;max-width:520px;margin:0 auto;background:#fff;border:1px solid var(--line);border-radius:999px;padding:6px;box-shadow:var(--shadow)}
.search-capsule input{flex:1;border:none;outline:none;padding:10px 18px;font-size:15px;background:transparent}
.search-capsule button{border:none;background:var(--green);color:#fff;border-radius:999px;padding:10px 26px;cursor:pointer}
.search-capsule button:hover{background:var(--green-dark)}
.curriculum-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:0}
.curriculum-card{background:var(--sand);border:1px solid var(--sand-line)}
.curriculum-card h2{font-size:24px;margin-bottom:6px}
.curriculum-card p{color:var(--muted);font-size:14px}
.stats-line{text-align:center;color:var(--muted);margin-top:26px;font-size:14px}
.section-rule{border:none;height:2px;background:var(--blue-line);margin:44px 0;border-radius:2px}

/* 卡片 */
.card{background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);padding:22px;display:block;text-decoration:none;color:inherit;transition:.2s}
a.card:hover{transform:translateY(-3px);box-shadow:0 10px 28px rgba(31,92,71,.16)}

/* 筛选 */
.filter-bar{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin:18px 0}
.filter-bar select{padding:8px 12px;border:1px solid var(--line);border-radius:8px;background:#fff;color:var(--text)}
.filter-bar select:focus{border-color:var(--blue);outline:none}
.page-head{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:14px;margin-bottom:6px}
.page-head h1{font-size:28px}
.crumbs{font-size:13px;color:var(--muted);margin-bottom:10px}
.crumbs a{color:var(--muted)}

/* 试卷卡片网格 */
.paper-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:16px;margin-top:16px}
.paper-card{border-top:4px solid var(--green)}
.paper-card-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px;color:var(--muted);font-size:14px}
.paper-card h3{font-size:19px;margin-bottom:6px}
.paper-card-meta{color:var(--muted);font-size:13px}
.chip{display:inline-block;border:1px solid var(--blue-line);color:var(--blue);border-radius:999px;padding:2px 12px;font-size:12px;margin:0 6px 6px 0;background:var(--blue-pale)}

/* 详情页 */
.detail-grid{display:grid;grid-template-columns:1fr 320px;gap:22px;align-items:start;margin-top:18px}
.detail-main h1{font-size:28px;margin-bottom:14px}
.info-card h2{font-size:18px;margin-bottom:14px}
.info-list{display:grid;grid-template-columns:auto 1fr;gap:10px 18px;font-size:14px}
.info-list dt{color:var(--muted)}
.info-list dd{color:var(--text)}
.rec-section{margin-top:36px}
.rec-section h2{font-size:22px;margin-bottom:4px}
.rec-section .rec-sub{color:var(--muted);font-size:13px;margin-bottom:12px}
.empty-tip{color:var(--muted);background:#fff;border:1px dashed var(--line);border-radius:var(--radius);padding:26px;text-align:center;margin-top:14px}

/* 考场 */
.exam-intro{max-width:640px;margin:30px auto}
.exam-intro h1{font-size:26px;margin-bottom:16px}
.exam-intro .info-list{margin-bottom:22px}
.exam-intro .btn{margin-top:8px}
.exam-bar{position:sticky;top:57px;z-index:40;background:var(--green);color:#fff;border-radius:var(--radius);padding:10px 18px;display:flex;align-items:center;gap:16px;justify-content:space-between;margin-bottom:14px}
.exam-bar-title{font-size:14px;opacity:.9}
.countdown{font-family:Consolas,monospace;font-size:22px;font-weight:700}
.countdown.danger{color:var(--warn)}
.exam-bar form{margin:0}
.exam-bar .btn{padding:8px 20px}
.exam-pdf{width:100%;height:78vh;border:1px solid var(--line);border-radius:var(--radius);background:#fff}
.bar-group{display:flex;align-items:center;gap:14px}
.bar-clock{font-family:Consolas,monospace;font-size:14px;opacity:.85}
.bar-btn{border:1px solid rgba(255,255,255,.55);color:#fff;background:transparent;border-radius:999px;padding:5px 16px;font-size:13px;cursor:pointer;transition:.2s}
.bar-btn:hover{background:rgba(255,255,255,.15)}

/* 试卷阅读器（pdf.js 逐页渲染，无黑底外框） */
.pv{margin-top:4px}
.pv:fullscreen{background:var(--bg);padding:18px 22px;overflow:auto}
.pv-bar{display:flex;align-items:center;gap:8px;margin-bottom:12px;flex-wrap:wrap}
.pv-btn{border:1px solid var(--line);background:#fff;color:var(--text);border-radius:8px;padding:5px 14px;font-size:13px;cursor:pointer;transition:.15s}
.pv-btn:hover{border-color:var(--blue);color:var(--blue)}
.pv-btn.active{background:var(--green);border-color:var(--green);color:#fff}
.pv-ind{font-family:Consolas,monospace;font-size:13px;color:var(--muted);min-width:110px;text-align:center}
.pv-spacer{flex:1}
.pv-stage-v{display:flex;flex-direction:column;align-items:center;gap:18px;padding:2px 0 34px}
.pv-stage-h{display:flex;align-items:flex-start;justify-content:center;min-height:calc(100vh - 190px);padding:2px 0}
.pv-stage-h.contained{align-items:center}
.pv-page{line-height:0}
.pv-page canvas{background:#fff;border-radius:4px;box-shadow:0 4px 18px rgba(31,92,71,.14)}
.pv-stage-h .pv-page{display:none}
.pv-stage-h .pv-page.current{display:block}
.pv-ph{display:flex;align-items:center;justify-content:center;color:var(--muted);font-size:13px;line-height:1.6;background:#fff;border:1px dashed var(--line);border-radius:4px}

/* 翻页坞：翻页条滚出屏幕后，固定在左上角接管翻页（淡入是纯效果动画） */
.pv-dock{position:fixed;top:66px;left:14px;z-index:45;display:flex;align-items:center;gap:6px;background:#fff;border:1px solid var(--line);border-radius:999px;padding:4px 10px;box-shadow:var(--shadow);opacity:0;transform:translateY(-14px);pointer-events:none;transition:opacity .25s,transform .25s}
.pv-dock.show{opacity:1;transform:none;pointer-events:auto}
.pv-dock .pv-btn{border:none;padding:4px 10px}
.pv-dock-ind{font-family:Consolas,monospace;font-size:12px;color:var(--muted);min-width:74px;text-align:center}

/* 横向适应屏幕按钮：固定左下角，仅答卷（room）视图出现 */
.pv-zoom{position:fixed;left:16px;bottom:16px;z-index:45;background:#fff;border:1px solid var(--green);color:var(--green);border-radius:999px;padding:7px 16px;font-size:13px;cursor:pointer;box-shadow:var(--shadow);transition:.2s}
.pv-zoom:hover{background:#f2f8f5}
.pv-zoom.active{background:var(--green);color:#fff}

/* 回到顶部 */
.back-top{position:fixed;right:22px;bottom:26px;width:42px;height:42px;border-radius:50%;background:var(--green);color:#fff;border:none;cursor:pointer;font-size:18px;box-shadow:var(--shadow);opacity:0;visibility:hidden;transition:.25s;z-index:60}
.back-top.show{opacity:1;visibility:visible}
.back-top:hover{background:var(--green-dark)}

/* 首页个性化区块 */
.home-section{margin-top:34px}
.home-section h2{font-size:22px;margin-bottom:4px}
.home-section .rec-sub{color:var(--muted);font-size:13px;margin-bottom:12px}

/* 使用流程（首页顶端） */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;max-width:860px;margin:26px auto 24px}
.step{background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);padding:16px 14px;text-align:center}
.step-no{width:28px;height:28px;border-radius:50%;background:var(--green);color:#fff;display:inline-flex;align-items:center;justify-content:center;font-size:14px;margin-bottom:8px}
.step h3{font-size:15px;margin-bottom:3px}
.step p{font-size:12px;color:var(--muted)}

/* 最新收录（可折叠） */
.newest-viewport{position:relative;overflow:hidden;margin-top:12px;border-radius:var(--radius);transition:max-height ease}
.new-list{background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}
.new-row{display:flex;justify-content:space-between;align-items:center;gap:14px;padding:12px 18px;border-bottom:1px solid var(--line);text-decoration:none;color:inherit}
.new-row:last-child{border-bottom:none}
.new-row:hover{background:#fbfdfc}
.new-row .t{font-size:14px}
.new-row .t b{color:var(--green);font-family:Georgia,serif}
.new-date{color:var(--muted);font-size:12px;white-space:nowrap}
.newest-fade{position:absolute;left:0;right:0;bottom:0;height:22%;background:linear-gradient(to bottom,rgba(246,250,248,0),#f6faf8);pointer-events:none;transition:opacity ease}
.newest-hint{color:var(--muted);font-size:12px;margin-top:8px}

/* 学科墙 */
.subj-wall{background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);padding:18px 20px;margin-top:12px}
.subj-group{margin-bottom:12px}
.subj-group:last-child{margin-bottom:0}
.subj-group .g{font-size:12px;color:var(--muted);margin-right:10px}
.subj{display:inline-block;background:var(--blue-pale);color:var(--blue);border:1px solid var(--blue-line);border-radius:999px;padding:4px 14px;font-size:13px;margin:0 8px 8px 0;text-decoration:none;transition:.2s}
.subj:hover{background:var(--blue);color:#fff}

/* 表单 */
.form-card{max-width:440px;margin:40px auto}
.form-card h1{font-size:26px;text-align:center;margin-bottom:18px}
.field{margin-bottom:14px}
.field label{display:block;font-size:14px;color:var(--muted);margin-bottom:6px}
.field input,.field textarea{width:100%;padding:10px 14px;border:1px solid var(--line);border-radius:10px;font-size:15px;outline:none;background:#fff;font-family:inherit}
.field input:focus,.field textarea:focus{border-color:var(--green)}
.form-error{background:#fdecea;color:var(--red);border-radius:10px;padding:10px 14px;font-size:14px;margin-bottom:14px}
.form-foot{text-align:center;margin-top:16px;font-size:14px;color:var(--muted)}
.form-foot a{color:var(--green)}
.grade-form{max-width:520px;margin:20px auto;background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);padding:26px}
.grade-form h2{margin-bottom:16px}

/* 记录 */
table.records{width:100%;border-collapse:collapse;background:#fff;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
table.records th,table.records td{padding:10px 14px;text-align:left;font-size:14px;border-bottom:1px solid var(--line)}
table.records th{background:var(--blue-pale);color:var(--blue)}
.avg-chips{margin:14px 0 22px}

/* 分页 */
.pagination{display:flex;gap:8px;justify-content:center;margin-top:26px;flex-wrap:wrap}
.pagination a,.pagination span{padding:8px 14px;border-radius:8px;text-decoration:none;font-size:14px}
.pagination a{background:#fff;border:1px solid var(--line);color:var(--text)}
.pagination a:hover{border-color:var(--blue);color:var(--blue)}
.pagination .current{background:var(--green);color:#fff}

/* 完成页 */
.done-card{max-width:560px;margin:40px auto;text-align:center}
.done-card h1{margin-bottom:14px}
.done-card p{margin-bottom:10px}
.done-card .btn{margin:8px 6px 0}

/* 页脚 */
.footer{text-align:center;padding:26px;color:#7a8a83;font-size:13px}
.footer a{color:#7a8a83;text-decoration:none}
.footer a:hover{color:var(--green)}

@media(max-width:900px){.detail-grid{grid-template-columns:1fr}}
@media(max-width:640px){.curriculum-grid{grid-template-columns:1fr}.exam-bar{flex-wrap:wrap}.hero h1{font-size:28px}.steps{grid-template-columns:repeat(2,1fr)}}