/* 家长端样式：沿用管理后台的浅色智慧教育风，加了孩子切换与家长专属组件 */
:root {
  --bg: #f4f6fa;
  --card: #ffffff;
  --line: #e3e8f0;
  --text: #1d2433;
  --muted: #6b7688;
  --brand: #2f6bff;
  --brand-soft: #eaf1ff;
  --ok: #0f9d58;
  --warn: #e08a00;
  --danger: #d93a3a;
  --shadow: 0 1px 3px rgba(20, 30, 60, .08), 0 6px 20px rgba(20, 30, 60, .05);
  --r: 12px;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font: 14px/1.6 -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  background: var(--bg); color: var(--text); -webkit-font-smoothing: antialiased;
}
.hidden { display: none !important; }
a { color: var(--brand); text-decoration: none; }

/* ---------- 登录 / 注册 ---------- */
.login-layer {
  min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 24px;
  background: linear-gradient(160deg, #eaf1ff 0%, #f4f6fa 60%);
}
.login-card {
  width: 100%; max-width: 380px; background: var(--card); border-radius: 16px;
  box-shadow: var(--shadow); padding: 28px 24px;
}
.login-logo { font-size: 20px; font-weight: 700; letter-spacing: .5px; }
.login-tip { color: var(--muted); font-size: 13px; margin: 6px 0 16px; }
.login-card label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 12px; }
.login-card input, .login-card select {
  display: block; width: 100%; margin-top: 6px; padding: 11px 12px; font-size: 15px;
  border: 1px solid var(--line); border-radius: 10px; background: #fbfcfe; color: var(--text);
}
.login-card input:focus { outline: none; border-color: var(--brand); background: #fff; }
.login-err { color: var(--danger); font-size: 13px; min-height: 20px; margin-bottom: 6px; }
.login-back { display: block; text-align: center; margin-top: 14px; font-size: 13px; color: var(--muted); }
.tabs { display: flex; gap: 6px; background: #f2f5fb; border-radius: 10px; padding: 4px; margin-bottom: 16px; }
.tabs .tab {
  flex: 1; border: 0; background: transparent; padding: 8px 6px; border-radius: 8px;
  font-size: 13px; color: var(--muted); cursor: pointer;
}
.tabs .tab.on { background: #fff; color: var(--brand); font-weight: 600; box-shadow: 0 1px 3px rgba(20,30,60,.1); }

/* ---------- 布局 ---------- */
.app { display: flex; min-height: 100vh; }
.side {
  width: 208px; flex: 0 0 208px; background: #fff; border-right: 1px solid var(--line);
  display: flex; flex-direction: column; position: sticky; top: 0; height: 100vh;
}
.side-brand { padding: 18px 18px 12px; font-weight: 700; font-size: 16px; line-height: 1.3; }
.side-brand span { font-weight: 400; font-size: 12px; color: var(--muted); }
.nav { flex: 1; overflow-y: auto; padding: 6px 10px; overscroll-behavior: contain; }
.nav button {
  display: block; width: 100%; text-align: left; padding: 9px 12px; margin-bottom: 2px;
  border: 0; background: transparent; border-radius: 9px; font-size: 14px; color: var(--text); cursor: pointer;
}
.nav button:hover { background: #f2f5fb; }
.nav button.on { background: var(--brand-soft); color: var(--brand); font-weight: 600; }
.nav button .dot {
  float: right; min-width: 18px; height: 18px; line-height: 18px; text-align: center;
  border-radius: 9px; background: var(--danger); color: #fff; font-size: 11px; padding: 0 5px; margin-top: 2px;
}
.side-foot { padding: 12px; border-top: 1px solid var(--line); display: flex; flex-direction: column; gap: 8px; }
.who { font-size: 12px; color: var(--muted); margin: 0; word-break: break-all; }
.side-foot .btn { width: 100%; }
.main { flex: 1; min-width: 0; display: flex; flex-direction: column; }
.topbar {
  display: flex; align-items: center; gap: 12px; padding: 14px 20px;
  background: #fff; border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 5;
}
.topbar h1 { font-size: 17px; margin: 0; flex: 1; }
.topbar-actions { display: flex; align-items: center; gap: 8px; }
.child-pick {
  padding: 6px 10px; border: 1px solid var(--line); border-radius: 8px; font-size: 13px;
  background: #fff; color: var(--text); max-width: 180px;
}
.panel { padding: 18px 20px 60px; }
.only-mobile { display: none; }

/* ---------- 通用组件 ---------- */
.btn {
  border: 1px solid var(--line); background: #fff; color: var(--text); border-radius: 9px;
  padding: 8px 14px; font-size: 13px; cursor: pointer; transition: .15s;
}
.btn:hover { border-color: #c8d3e6; }
.btn-primary { background: var(--brand); border-color: var(--brand); color: #fff; }
.btn-primary:hover { background: #2559e0; }
.btn-danger { color: var(--danger); border-color: #f2c9c9; }
.btn-danger:hover { background: #fdf0f0; }
.btn-ghost { background: transparent; }
.btn-sm { padding: 5px 10px; font-size: 12px; border-radius: 8px; }
.btn-block { width: 100%; padding: 12px; font-size: 15px; }
.btn:disabled { opacity: .5; cursor: not-allowed; }

.grid { display: grid; gap: 14px; }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }

.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--r); box-shadow: var(--shadow); padding: 16px; }
.card h3 { margin: 0 0 12px; font-size: 14px; font-weight: 600; }
/* 统一纵向节奏：面板与其内层列表容器的直接子块之间一律 14px。
   注意不要用 .card + .card 加外距——grid 内部会与 gap 叠加成 28px，造成「有的挨着有的隔很远」 */
.panel > * + *, .panel-body > * + * { margin-top: 14px; }

/* 家长端 · 多孩子手风琴：点开一个，其他自动收拢 */
.child-acc { display: flex; flex-direction: column; gap: 10px; }
.child-acc-item { background: var(--card); border: 1px solid var(--line); border-radius: var(--r); box-shadow: var(--shadow); overflow: hidden; }
.child-acc-h { display: flex; align-items: center; gap: 10px; padding: 14px 16px; cursor: pointer; user-select: none; }
.child-acc-h:hover { background: #f8fafd; }
.child-acc-h .cah-main { flex: 1; min-width: 0; }
.child-acc-h .cah-name { display: flex; align-items: baseline; gap: 8px; }
.child-acc-h .cah-name b { font-size: 16px; }
.child-acc-h .cah-sub { font-size: 12px; color: var(--muted); }
.child-acc-h .cah-sum { font-size: 13px; color: var(--muted); margin-top: 4px; }
.child-acc-h .cah-chev { font-size: 20px; color: var(--muted); transition: transform .2s; flex: 0 0 auto; line-height: 1; }
.child-acc-item.open .cah-chev { transform: rotate(90deg); }
.child-acc-h .cc-dot { position: static; margin-left: 4px; min-width: 18px; height: 18px; padding: 0 5px; background: var(--danger); color: #fff; border-radius: 9px; font-size: 11px; font-weight: 700; line-height: 18px; text-align: center; flex: 0 0 auto; }
.child-acc-b { display: none; padding: 0; border-top: 1px solid var(--line); }
.child-acc-item.open .child-acc-b { display: block; }
.child-acc-b > .card { border: 0; box-shadow: none; padding: 14px 16px 16px; border-radius: 0; }
.stat { background: var(--card); border: 1px solid var(--line); border-radius: var(--r); padding: 16px; box-shadow: var(--shadow); }
.stat .k { font-size: 12px; color: var(--muted); }
.stat .v { font-size: 26px; font-weight: 700; margin-top: 4px; letter-spacing: -.5px; }
.stat .s { font-size: 12px; color: var(--muted); margin-top: 2px; }

.toolbar { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-bottom: 12px; }
.toolbar input, .toolbar select {
  padding: 7px 10px; border: 1px solid var(--line); border-radius: 8px; font-size: 13px; background: #fff; color: var(--text);
}
.toolbar input[type="search"] { min-width: 180px; }

.tbl-wrap { overflow-x: auto; background: var(--card); border: 1px solid var(--line); border-radius: var(--r); box-shadow: var(--shadow); }
table { width: 100%; border-collapse: collapse; font-size: 13px; }
th, td { text-align: left; padding: 9px 12px; border-bottom: 1px solid var(--line); white-space: nowrap; }
th { background: #f8fafd; color: var(--muted); font-weight: 600; font-size: 12px; position: sticky; top: 0; }
tbody tr:hover { background: #fafbfe; }
tbody tr:last-child td { border-bottom: 0; }
td.wrap { white-space: nowrap; max-width: 260px; overflow: hidden; text-overflow: ellipsis; }
.rowclick { cursor: pointer; }
.empty { padding: 34px; text-align: center; color: var(--muted); font-size: 13px; }

.tag { display: inline-block; padding: 1px 8px; border-radius: 20px; font-size: 12px; background: #eef1f6; color: var(--muted); }
.tag.ok { background: #e6f6ed; color: var(--ok); }
.tag.warn { background: #fdf3e0; color: var(--warn); }
.tag.bad { background: #fdecec; color: var(--danger); }
.tag.blue { background: var(--brand-soft); color: var(--brand); }

.form-row { display: grid; grid-template-columns: 200px 1fr; gap: 10px; align-items: center; padding: 7px 0; border-bottom: 1px dashed var(--line); }
.form-row:last-child { border-bottom: 0; }
.form-row label { font-size: 13px; color: var(--muted); }
.form-row.col { grid-template-columns: 1fr; gap: 6px; align-items: start; }
.form-row.col > label { padding-top: 0; }
.form-row input, .form-row select, .form-row textarea {
  width: 100%; padding: 7px 10px; border: 1px solid var(--line); border-radius: 8px;
  font-size: 13px; background: #fff; color: var(--text); font-family: inherit;
}
.form-row textarea { min-height: 90px; resize: vertical; }
.hint { font-size: 12px; color: var(--muted); margin-top: 4px; }

/* 中文阶梯编辑器（打卡阶梯 / 正确率阶梯，代替裸 JSON 输入框）
   每档固定一行不折行：输入框收窄居中并去掉数字步进箭头，极窄屏横向滚动兜底 */
.tier-list { display: flex; flex-direction: column; }
.tier-row { display: flex; align-items: center; gap: 6px; padding: 5px 0; flex-wrap: nowrap; overflow-x: auto; }
.tier-row .tin {
  flex: 0 0 46px; width: 46px; min-width: 0; padding: 6px 4px; text-align: center;
  border: 1px solid var(--line); border-radius: 7px; font-size: 13px;
  background: #fff; color: var(--text); appearance: textfield; -moz-appearance: textfield;
}
.tier-row .tin::-webkit-outer-spin-button,
.tier-row .tin::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
.tier-row .tin:focus { outline: none; border-color: var(--brand); }
.tier-del { flex: 0 0 auto; width: 26px; height: 26px; padding: 0; font-size: 13px; line-height: 1; }
.tier-pre { font-size: 13px; color: var(--text); white-space: nowrap; }
.tier-foot { margin-top: 8px; display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }

.bars { display: flex; align-items: flex-end; gap: 6px; height: 130px; padding-top: 8px; }
.bars .b { flex: 1; display: flex; flex-direction: column; justify-content: flex-end; align-items: center; height: 100%; }
.bars .b i { display: block; width: 100%; background: var(--brand); border-radius: 4px 4px 0 0; min-height: 2px; }
.bars .b span { font-size: 10px; color: var(--muted); margin-top: 4px; }
.bars.slim { height: 74px; }

/* 学习日历 */
.cal { display: grid; grid-template-columns: repeat(15, 1fr); gap: 4px; }
.cal i {
  display: block; aspect-ratio: 1 / 1; border-radius: 4px; background: #eef1f6; font-style: normal;
  font-size: 9px; color: var(--muted); text-align: center; line-height: 1;
  display: flex; align-items: center; justify-content: center;
}
.cal i.l1 { background: #d9e6ff; } .cal i.l2 { background: #a9c6ff; } .cal i.l3 { background: #6d9bff; color: #fff; } .cal i.l4 { background: var(--brand); color: #fff; }

/* 进度条 */
.bar { height: 8px; border-radius: 4px; background: #eef1f6; overflow: hidden; }
.bar > i { display: block; height: 100%; background: var(--brand); }
.bar.ok > i { background: var(--ok); }
.bar.warn > i { background: var(--warn); }
.bar.bad > i { background: var(--danger); }

.toast {
  position: fixed; left: 50%; bottom: 28px; transform: translate(-50%, 20px);
  background: #1d2433; color: #fff; padding: 10px 18px; border-radius: 10px; font-size: 13px;
  opacity: 0; pointer-events: none; transition: .25s; z-index: 99; max-width: 80vw;
}
.toast.on { opacity: 1; transform: translate(-50%, 0); }
.toast.err { background: var(--danger); }

/* ---------- 弹窗 ---------- */
.mask { position: fixed; inset: 0; z-index: 90; background: rgba(15, 23, 42, .45); display: flex; align-items: center; justify-content: center; padding: 18px; }
.modal { background: #fff; border-radius: 14px; box-shadow: var(--shadow); width: 100%; max-width: 520px; max-height: 88vh; display: flex; flex-direction: column; }
.modal h3 { margin: 0; padding: 16px 18px; font-size: 15px; border-bottom: 1px solid var(--line); }
.modal .body { padding: 14px 18px; overflow-y: auto; }
.modal .foot { padding: 12px 18px; border-top: 1px solid var(--line); display: flex; justify-content: flex-end; gap: 8px; }
.modal .body .form-row { grid-template-columns: 150px 1fr; }

.q-stem { font-size: 14px; line-height: 1.75; white-space: pre-wrap; word-break: break-word; }
.q-opt { padding: 5px 0 5px 4px; font-size: 13.5px; }
.q-opt.ok { color: var(--ok); font-weight: 600; }
.q-opt.bad { color: var(--danger); }
.q-block { padding: 12px 0; border-bottom: 1px dashed var(--line); }
.q-block:last-child { border-bottom: 0; }
.q-meta { font-size: 12px; color: var(--muted); margin-bottom: 6px; }

/* 绑定码 */
.code-box {
  display: flex; align-items: center; gap: 12px; background: var(--brand-soft);
  border-radius: 10px; padding: 14px 16px; margin-top: 8px;
}
.code-box b { font-size: 26px; letter-spacing: 5px; color: var(--brand); font-family: ui-monospace, Menlo, Consolas, monospace; }
.code-box .s { font-size: 12px; color: var(--muted); }

/* ---------- 移动端 ---------- */
.backdrop { display: none; }
@media (max-width: 860px) {
  body.nav-open { overflow: hidden; }
  body.nav-open .backdrop { display: block; position: fixed; inset: 0; z-index: 19; background: rgba(15, 23, 42, .4); }
  .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .side {
    position: fixed; left: 0; top: 0; z-index: 20; transform: translateX(-100%);
    transition: transform .2s; box-shadow: var(--shadow);
  }
  .side.open { transform: translateX(0); }
  .only-mobile { display: inline-block; }
  .panel { padding: 14px 12px 60px; }
  .form-row { grid-template-columns: 1fr; gap: 4px; }
  .topbar { padding: 12px; gap: 8px; }
  .topbar h1 { font-size: 15px; }
  .child-pick { max-width: 110px; font-size: 12px; }
  th, td { padding: 7px 9px; font-size: 12px; }
  td.wrap { max-width: 150px; }
  .cal { grid-template-columns: repeat(10, 1fr); }
  .code-box b { font-size: 22px; letter-spacing: 3px; }
}

/* ICP 备案号（法律要求） */
#site-foot {
  position: fixed;
  left: 0; right: 0; bottom: 6px;
  text-align: center;
  font-size: 12px;
  line-height: 1.4;
  color: #9aa7b8;
  z-index: 35;
  pointer-events: none;
  padding: 0 10px;
}
#site-foot a { display: block; color: #9aa7b8; text-decoration: none; pointer-events: auto; }
#site-foot a:hover { color: #2f7dd1; }
/* 备案号只在登录/注册页展示，登录后隐藏 */
body.authed #site-foot { display: none; }