/* =========================================================
   秒读课堂 · 自建版样式
   设计语言：靛蓝渐变 + 玻璃卡片 + 大圆角，中文教育产品气质
   ========================================================= */
:root{
  --brand:#6366f1;
  --brand-2:#a855f7;
  --brand-3:#ec4899;
  --brand-soft:#eef2ff;
  --bg:#f5f7fb;
  --card:#ffffff;
  --text:#1e293b;
  --text-2:#475569;
  --muted:#94a3b8;
  --line:#e8ecf4;
  --line-2:#f1f5f9;
  --ok:#10b981;
  --warn:#f59e0b;
  --danger:#ef4444;
  --radius:18px;
  --radius-sm:12px;
  --shadow:0 10px 30px rgba(15,23,42,.06);
  --shadow-lg:0 24px 60px rgba(15,23,42,.10);
  --sidebar-w:240px;
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;background:var(--bg);color:var(--text);
  font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB","Noto Sans SC",system-ui,-apple-system,sans-serif;
  font-size:14px;line-height:1.6;-webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
button{font-family:inherit}
::-webkit-scrollbar{width:8px;height:8px}
::-webkit-scrollbar-thumb{background:#d7dee9;border-radius:8px}
::-webkit-scrollbar-track{background:transparent}

/* ── 启动屏 ── */
#boot{position:fixed;inset:0;display:flex;align-items:center;justify-content:center;background:#f8fafc;overflow:hidden}
.boot-blob{position:absolute;border-radius:50%;filter:blur(90px);opacity:.5}
.boot-blob.b1{width:520px;height:520px;background:#c7d2fe;top:-140px;left:-120px}
.boot-blob.b2{width:620px;height:620px;background:#fbcfe8;bottom:-200px;right:-160px}
.boot-card{position:relative;z-index:2;display:flex;flex-direction:column;align-items:center;
  background:rgba(255,255,255,.82);border:1px solid #fff;border-radius:32px;padding:56px 64px;
  box-shadow:var(--shadow-lg);backdrop-filter:blur(16px)}
.boot-logo{width:72px;height:72px;border-radius:50%;display:flex;align-items:center;justify-content:center;
  background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;box-shadow:0 12px 28px rgba(99,102,241,.35);
  animation:pop 2s ease-in-out infinite}
.boot-logo svg{width:32px;height:32px}
.boot-title{margin-top:22px;font-size:20px;font-weight:800;letter-spacing:-.01em}
.boot-sub{margin-top:6px;color:var(--muted)}
@keyframes pop{0%,100%{transform:scale(1)}50%{transform:scale(1.07)}}

/* ── 登录页 ── */
.login{position:fixed;inset:0;display:flex;align-items:center;justify-content:center;overflow:hidden;background:#f8fafc}
.login .blob{position:absolute;border-radius:50%;pointer-events:none}
.login .blob.l1{width:46vw;height:46vw;background:rgba(199,210,254,.55);filter:blur(120px);top:-12%;left:-10%}
.login .blob.l2{width:52vw;height:52vw;background:rgba(255,228,230,.6);filter:blur(120px);bottom:-16%;right:-12%}
.login .blob.l3{width:22vw;height:22vw;background:rgba(254,243,199,.5);filter:blur(90px);top:22%;right:24%}
.login-inner{position:relative;z-index:2;display:flex;gap:56px;align-items:center;max-width:1080px;padding:0 32px;width:100%}
.login-intro{flex:1;max-width:470px}
.login-brand{display:inline-flex;align-items:center;gap:10px;padding:8px 16px;border-radius:999px;
  background:#fff;box-shadow:var(--shadow);font-weight:800;color:var(--brand)}
.login-brand .dot{width:8px;height:8px;border-radius:50%;background:linear-gradient(135deg,var(--brand),var(--brand-3))}
.login-h1{margin:26px 0 14px;font-size:40px;line-height:1.25;font-weight:900;letter-spacing:-.03em}
.login-h1 em{font-style:normal;background:linear-gradient(120deg,var(--brand),var(--brand-2),var(--brand-3));
  -webkit-background-clip:text;background-clip:text;color:transparent}
.login-p{color:var(--text-2);font-size:15px;max-width:400px}
.login-points{display:flex;gap:26px;margin-top:30px}
.login-points div{font-size:13px;color:var(--muted)}
.login-points b{display:block;font-size:22px;color:var(--text);font-weight:800}
.login-card{width:400px;background:rgba(255,255,255,.88);backdrop-filter:blur(18px);border:1px solid #fff;
  border-radius:28px;padding:38px 36px;box-shadow:var(--shadow-lg)}
.login-card h2{margin:0 0 6px;font-size:24px;font-weight:900;letter-spacing:-.02em}
.login-card .tip{color:var(--muted);margin-bottom:26px;font-size:13px}
.login-field{margin-bottom:16px}
.login-field label{display:block;font-size:12px;font-weight:700;color:var(--text-2);margin-bottom:7px;letter-spacing:.02em}
.login-field input{width:100%;height:46px;border-radius:14px;border:1px solid var(--line);background:#fff;
  padding:0 14px;font-size:14px;outline:none;transition:.2s}
.login-field input:focus{border-color:var(--brand);box-shadow:0 0 0 4px rgba(99,102,241,.12)}
.login-btn{width:100%;height:48px;margin-top:8px;border:none;border-radius:14px;cursor:pointer;
  background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;font-size:15px;font-weight:800;
  letter-spacing:.04em;box-shadow:0 12px 26px rgba(99,102,241,.34);transition:transform .2s,box-shadow .2s}
.login-btn:hover{transform:translateY(-2px);box-shadow:0 16px 32px rgba(99,102,241,.4)}
.login-btn:disabled{opacity:.7;cursor:default;transform:none}
.login-err{min-height:20px;color:var(--danger);font-size:13px;margin-top:10px}

/* ── 主框架 ── */
.shell{display:flex;min-height:100vh}
.sidebar{width:var(--sidebar-w);flex:none;background:#fff;border-right:1px solid var(--line);
  display:flex;flex-direction:column;position:sticky;top:0;height:100vh}
.side-brand{display:flex;align-items:center;gap:11px;padding:22px 20px 18px}
.side-brand .mark{width:38px;height:38px;border-radius:12px;display:flex;align-items:center;justify-content:center;
  background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;box-shadow:0 8px 18px rgba(99,102,241,.3)}
.side-brand .mark svg{width:20px;height:20px}
.side-brand b{font-size:16px;font-weight:900;letter-spacing:-.01em}
.side-brand span{display:block;font-size:11px;color:var(--muted);font-weight:600;letter-spacing:.08em}
.side-menu{padding:8px 12px;overflow:auto;flex:1}
.side-group{font-size:11px;color:#b6c0cf;font-weight:700;letter-spacing:.12em;padding:14px 12px 6px}
.side-item{display:flex;align-items:center;gap:11px;padding:10px 12px;border-radius:12px;color:var(--text-2);
  font-weight:600;cursor:pointer;margin-bottom:2px;transition:.15s}
.side-item svg{width:17px;height:17px;opacity:.75}
.side-item:hover{background:var(--line-2);color:var(--text)}
.side-item.active{background:linear-gradient(135deg,rgba(99,102,241,.12),rgba(168,85,247,.10));color:var(--brand)}
.side-item.active svg{opacity:1}
.side-user{border-top:1px solid var(--line);padding:14px 16px;display:flex;align-items:center;gap:10px}
.avatar{width:34px;height:34px;border-radius:50%;display:flex;align-items:center;justify-content:center;flex:none;
  background:linear-gradient(135deg,#c7d2fe,#e9d5ff);color:#4c1d95;font-weight:800;font-size:13px}
.side-user .u{flex:1;min-width:0}
.side-user .u b{display:block;font-size:13px;font-weight:700;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.side-user .u span{font-size:11px;color:var(--muted)}
.icon-btn{width:32px;height:32px;border:none;background:transparent;border-radius:10px;cursor:pointer;color:var(--muted);
  display:flex;align-items:center;justify-content:center}
.icon-btn:hover{background:var(--line-2);color:var(--text)}

.main{flex:1;min-width:0;display:flex;flex-direction:column}
.topbar{height:64px;display:flex;align-items:center;gap:14px;padding:0 28px;background:rgba(255,255,255,.72);
  backdrop-filter:blur(10px);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}
.topbar h1{margin:0;font-size:19px;font-weight:900;letter-spacing:-.02em}
.crumb{color:var(--muted);font-size:13px}
.topbar .spacer{flex:1}
.content{padding:24px 28px 48px;max-width:1400px;width:100%}

/* ── 卡片 ── */
.card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);border:1px solid #fff;overflow:hidden}
.card-pad{padding:22px 24px}
.card-head{display:flex;align-items:center;gap:12px;padding:18px 24px;border-bottom:1px solid var(--line-2)}
.card-head h2{margin:0;font-size:15px;font-weight:800}
.card-head .spacer{flex:1}

.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:16px;margin-bottom:20px}
.stat{background:#fff;border-radius:var(--radius);padding:20px 22px;box-shadow:var(--shadow);border:1px solid #fff;
  position:relative;overflow:hidden}
.stat::after{content:'';position:absolute;right:-30px;top:-30px;width:96px;height:96px;border-radius:50%;
  background:linear-gradient(135deg,rgba(99,102,241,.10),rgba(236,72,153,.08))}
.stat .k{color:var(--muted);font-size:12px;font-weight:700;letter-spacing:.04em}
.stat .v{font-size:30px;font-weight:900;letter-spacing:-.03em;margin-top:6px}
.stat .v small{font-size:13px;color:var(--muted);font-weight:600;margin-left:4px}
.stat .d{font-size:12px;color:var(--text-2);margin-top:2px}

.grid-2{display:grid;grid-template-columns:1.4fr 1fr;gap:18px}
@media (max-width:1080px){.grid-2{grid-template-columns:1fr}}

/* ── 按钮 ── */
.btn{display:inline-flex;align-items:center;gap:7px;height:38px;padding:0 16px;border-radius:12px;border:1px solid transparent;
  background:#fff;color:var(--text-2);font-size:13px;font-weight:700;cursor:pointer;transition:.15s;white-space:nowrap}
.btn svg{width:15px;height:15px}
.btn:hover{background:var(--line-2)}
.btn.primary{background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;
  box-shadow:0 8px 18px rgba(99,102,241,.28)}
.btn.primary:hover{transform:translateY(-1px);box-shadow:0 12px 22px rgba(99,102,241,.34)}
.btn.ghost{border-color:var(--line);background:#fff}
.btn.ghost:hover{border-color:#d6dde9;background:#fbfcfe}
.btn.danger{color:var(--danger)}
.btn.danger:hover{background:#fef2f2}
.btn.sm{height:30px;padding:0 11px;font-size:12px;border-radius:9px}
.btn:disabled{opacity:.55;cursor:not-allowed}

/* ── 表单 ── */
.field{margin-bottom:16px}
.field label{display:block;font-size:12px;font-weight:700;color:var(--text-2);margin-bottom:6px}
.input,.select,.textarea{width:100%;border:1px solid var(--line);border-radius:12px;background:#fff;
  padding:9px 13px;font-size:13.5px;color:var(--text);outline:none;transition:.15s;font-family:inherit}
.input:focus,.select:focus,.textarea:focus{border-color:var(--brand);box-shadow:0 0 0 3px rgba(99,102,241,.12)}
.textarea{min-height:120px;resize:vertical;line-height:1.8}
.input.sm,.select.sm{padding:6px 10px;height:34px;font-size:13px}
.row{display:flex;gap:12px;flex-wrap:wrap}
.row > *{flex:1;min-width:160px}
.toolbar{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin-bottom:16px}
.toolbar .spacer{flex:1}
.search{position:relative}
.search input{width:240px;padding-left:34px}
.search svg{position:absolute;left:11px;top:50%;transform:translateY(-50%);width:15px;height:15px;color:var(--muted)}

/* ── 表格 ── */
.table-wrap{overflow:auto}
table.tb{width:100%;border-collapse:collapse;font-size:13.5px}
table.tb th{text-align:left;padding:12px 16px;color:var(--muted);font-size:12px;font-weight:700;
  letter-spacing:.03em;background:#fbfcfe;border-bottom:1px solid var(--line-2);white-space:nowrap}
table.tb td{padding:13px 16px;border-bottom:1px solid var(--line-2);vertical-align:middle}
table.tb tr:last-child td{border-bottom:none}
table.tb tbody tr:hover{background:#fbfcff}
table.tb .t-title{font-weight:700;color:var(--text)}
table.tb .t-sub{color:var(--muted);font-size:12px;margin-top:2px}
.cell-actions{display:flex;gap:6px;justify-content:flex-end}

/* ── 标签 ── */
.tag{display:inline-flex;align-items:center;gap:5px;height:22px;padding:0 9px;border-radius:7px;
  font-size:11.5px;font-weight:700;background:var(--line-2);color:var(--text-2)}
.tag.indigo{background:#eef2ff;color:#4f46e5}
.tag.green{background:#ecfdf5;color:#059669}
.tag.amber{background:#fffbeb;color:#b45309}
.tag.red{background:#fef2f2;color:#dc2626}
.tag.purple{background:#faf5ff;color:#7e22ce}
.dot-badge{width:6px;height:6px;border-radius:50%;background:currentColor}

/* ── 空状态 ── */
.empty{padding:56px 20px;text-align:center;color:var(--muted)}
.empty svg{width:44px;height:44px;opacity:.35;margin-bottom:10px}
.empty b{display:block;color:var(--text-2);font-size:14px;margin-bottom:4px}

/* ── 分页 ── */
.pager{display:flex;align-items:center;gap:8px;justify-content:flex-end;padding:14px 20px;color:var(--muted);font-size:12.5px}
.pager button{width:30px;height:30px;border-radius:9px;border:1px solid var(--line);background:#fff;cursor:pointer;color:var(--text-2)}
.pager button:disabled{opacity:.45;cursor:default}

/* ── 弹窗 ── */
.mask{position:fixed;inset:0;background:rgba(15,23,42,.42);backdrop-filter:blur(3px);z-index:100;
  display:flex;align-items:flex-start;justify-content:center;padding:8vh 20px;overflow:auto}
.modal{width:520px;max-width:100%;background:#fff;border-radius:20px;box-shadow:var(--shadow-lg);overflow:hidden;
  animation:up .22s ease}
.modal.lg{width:760px}
.modal.xl{width:940px}
@keyframes up{from{transform:translateY(10px);opacity:0}to{transform:none;opacity:1}}
.modal-head{display:flex;align-items:center;padding:18px 22px;border-bottom:1px solid var(--line-2)}
.modal-head h3{margin:0;font-size:16px;font-weight:800}
.modal-head .spacer{flex:1}
.modal-body{padding:22px}
.modal-foot{display:flex;justify-content:flex-end;gap:10px;padding:14px 22px;border-top:1px solid var(--line-2);background:#fcfdff}

/* ── 提示 ── */
.toasts{position:fixed;top:20px;right:20px;z-index:200;display:flex;flex-direction:column;gap:10px}
.toast{min-width:220px;max-width:360px;background:#fff;border-radius:14px;box-shadow:var(--shadow-lg);
  padding:12px 16px;display:flex;gap:10px;align-items:flex-start;font-size:13.5px;animation:up .2s ease;
  border-left:4px solid var(--brand)}
.toast.ok{border-left-color:var(--ok)}
.toast.err{border-left-color:var(--danger)}
.toast .txt{flex:1}

/* ── 文章内容 ── */
.prose{font-size:16.5px;line-height:2.05;color:#243044;max-width:760px;margin:0 auto;
  font-family:"Songti SC","Noto Serif SC",Georgia,serif}
.prose p{margin:0 0 1.1em;text-indent:2em}
.article-meta{display:flex;gap:10px;flex-wrap:wrap;align-items:center;color:var(--muted);font-size:13px;margin-bottom:6px}

/* ── 阅读器 ── */
.reader{display:flex;flex-direction:column;min-height:100vh;background:#fbfaf7}
.reader-bar{position:sticky;top:0;z-index:10;display:flex;align-items:center;gap:14px;padding:14px 26px;
  background:rgba(255,255,255,.9);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.reader-body{padding:40px 24px 120px}
.reader-title{font-size:30px;font-weight:900;text-align:center;letter-spacing:-.02em;margin:10px 0 4px}
.reader-sub{text-align:center;color:var(--muted);margin-bottom:34px}
.reader-foot{position:fixed;left:0;right:0;bottom:0;padding:14px 26px;background:rgba(255,255,255,.94);
  backdrop-filter:blur(10px);border-top:1px solid var(--line);display:flex;align-items:center;gap:14px;z-index:10}
.timer{font-variant-numeric:tabular-nums;font-weight:800;color:var(--brand);font-size:15px}

/* ── 进度条 ── */
.bar{height:7px;border-radius:999px;background:var(--line-2);overflow:hidden}
.bar > i{display:block;height:100%;border-radius:999px;background:linear-gradient(90deg,var(--brand),var(--brand-2))}

/* ── 迷你柱状图 ── */
.spark{display:flex;align-items:flex-end;gap:10px;height:120px;padding:8px 4px 0}
.spark .col{flex:1;display:flex;flex-direction:column;align-items:center;gap:8px;height:100%;justify-content:flex-end}
.spark .bar-v{width:100%;border-radius:8px 8px 4px 4px;background:linear-gradient(180deg,#a5b4fc,#818cf8);min-height:4px;
  transition:height .3s}
.spark .lbl{font-size:11px;color:var(--muted)}

/* ── 题目 ── */
.q-item{padding:18px 0;border-bottom:1px dashed var(--line)}
.q-item:last-child{border-bottom:none}
.q-stem{font-weight:700;margin-bottom:12px;line-height:1.8}
.q-opt{display:flex;gap:10px;align-items:flex-start;padding:10px 14px;border:1px solid var(--line);border-radius:12px;
  margin-bottom:8px;cursor:pointer;transition:.15s}
.q-opt:hover{border-color:#c7d2fe;background:#fafbff}
.q-opt.sel{border-color:var(--brand);background:#eef2ff}
.q-opt.right{border-color:var(--ok);background:#ecfdf5}
.q-opt.wrong{border-color:var(--danger);background:#fef2f2}
.q-opt .k{width:22px;height:22px;border-radius:7px;background:var(--line-2);display:flex;align-items:center;
  justify-content:center;font-size:12px;font-weight:800;flex:none}

/* ── 响应式 ── */
@media (max-width:860px){
  .sidebar{position:fixed;left:0;top:0;bottom:0;z-index:50;transform:translateX(-100%);transition:.25s;box-shadow:var(--shadow-lg)}
  .sidebar.open{transform:none}
  .content{padding:18px 16px 40px}
  .topbar{padding:0 16px}
  .login-inner{flex-direction:column;gap:30px;padding:24px}
  .login-intro{display:none}
  .login-card{width:100%;max-width:400px}
}
.hide{display:none !important}
.mt8{margin-top:8px}.mt16{margin-top:16px}.mt24{margin-top:24px}
.muted{color:var(--muted)}
.right{text-align:right}
.nowrap{white-space:nowrap}
.flex{display:flex;align-items:center;gap:8px}