/* ============================================================
   pages.css — 各页面专属样式
   ============================================================ */

/* ---------- 登录 / 首页（P1） ---------- */
.auth-screen { min-height: 100vh; display: flex; flex-direction: column; }
.auth-screen .auth-top { display: flex; align-items: center; justify-content: space-between; padding: 16px 20px; }
.auth-card { flex: 1; display: flex; align-items: center; justify-content: center; padding: 24px 16px 48px; }
.auth-box { width: 100%; max-width: 400px; background: var(--c-surface); border-radius: var(--radius-xl); box-shadow: var(--shadow-lg); padding: 32px 28px; }
.auth-box .auth-logo { width: 52px; height: 52px; border-radius: 15px; background: linear-gradient(135deg, var(--c-primary), #7c6cf0); display: grid; place-items: center; color: #fff; margin: 0 auto 18px; }
.auth-title { text-align: center; font-size: 22px; margin-bottom: 4px; }
.auth-sub { text-align: center; color: var(--c-text-2); font-size: 14px; margin-bottom: 24px; }
.role-switch { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-bottom: 20px; }
.role-card { border: 1.5px solid var(--c-border-strong); border-radius: var(--radius); padding: 16px 12px; text-align: center; cursor: pointer; transition: all 0.15s; background: var(--c-surface); }
.role-card svg { width: 28px; height: 28px; margin: 0 auto 8px; color: var(--c-text-3); }
.role-card .role-name { font-weight: 650; }
.role-card .role-desc { font-size: 12px; color: var(--c-text-3); }
.role-card.active { border-color: var(--c-primary); background: var(--c-primary-050); }
.role-card.active svg { color: var(--c-primary); }
.role-card.active .role-name { color: var(--c-primary); }

/* ---------- 学生首页仪表盘 ---------- */
.dash-hero { border-radius: var(--radius-lg); padding: 20px; color: #fff; background: linear-gradient(135deg, #4f46e5, #7c6cf0); box-shadow: var(--shadow); }
.dash-hero .hero-hi { font-size: 13px; opacity: 0.85; }
.dash-hero .hero-name { font-size: 20px; font-weight: 700; margin: 2px 0 4px; }
.dash-hero .hero-sub { font-size: 13px; opacity: 0.85; }
.stat-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; margin-top: 16px; }
.stat-card { background: var(--c-surface); border: 1px solid var(--c-border); border-radius: var(--radius); padding: 16px; box-shadow: var(--shadow-sm); }
.stat-card .stat-icon { width: 36px; height: 36px; border-radius: 10px; display: grid; place-items: center; margin-bottom: 10px; }
.stat-card .stat-value { font-size: 24px; font-weight: 700; line-height: 1; }
.stat-card .stat-label { font-size: 12.5px; color: var(--c-text-2); margin-top: 4px; }
.quick-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; margin-top: 16px; }
.quick-card { display: flex; align-items: center; gap: 12px; background: var(--c-surface); border: 1px solid var(--c-border); border-radius: var(--radius); padding: 16px; cursor: pointer; box-shadow: var(--shadow-sm); transition: all 0.15s; }
.quick-card:hover { border-color: var(--c-primary); box-shadow: var(--shadow); }
.quick-card .qc-icon { width: 42px; height: 42px; border-radius: 12px; display: grid; place-items: center; flex: none; }
.quick-card .qc-title { font-weight: 650; font-size: 14.5px; }
.quick-card .qc-sub { font-size: 12px; color: var(--c-text-2); }
.weak-row { display: flex; align-items: center; gap: 10px; padding: 10px 0; border-bottom: 1px solid var(--c-border); }
.weak-row:last-child { border-bottom: none; }
.weak-row .weak-name { flex: 1; font-weight: 550; font-size: 14px; }
.weak-row .weak-meta { font-size: 12px; color: var(--c-text-2); }

/* ---------- 做题界面（P2） ---------- */
.practice-shell { max-width: 760px; margin: 0 auto; }
.breadcrumb { display: flex; align-items: center; gap: 6px; font-size: 13px; color: var(--c-text-2); flex-wrap: wrap; }
.breadcrumb .sep { color: var(--c-text-3); }
.breadcrumb .cur { color: var(--c-text); font-weight: 600; }
.practice-top { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 12px; }
.practice-progress { display: flex; align-items: center; gap: 12px; }
.practice-progress .progress { flex: 1; min-width: 140px; }
.practice-progress .count { font-size: 13px; color: var(--c-text-2); font-variant-numeric: tabular-nums; white-space: nowrap; }

.question-card { background: var(--c-surface); border: 1px solid var(--c-border); border-radius: var(--radius-lg); padding: 24px; box-shadow: var(--shadow-sm); }
.question-tags { display: flex; gap: 8px; margin-bottom: 14px; }
.question-stem { font-size: 17px; line-height: 1.6; margin-bottom: 8px; }
.question-stem .math { font-family: var(--mono); background: var(--c-surface-2); padding: 1px 5px; border-radius: 5px; }
.question-fig { background: var(--c-surface-2); border: 1px solid var(--c-border); border-radius: var(--radius); padding: 20px; text-align: center; margin: 14px 0; }
.answer-options { display: flex; flex-direction: column; gap: 10px; margin-top: 14px; }
.opt {
  display: flex; align-items: center; gap: 12px; border: 1.5px solid var(--c-border-strong);
  border-radius: var(--radius); padding: 14px 16px; cursor: pointer; font-size: 15px; transition: all 0.15s; background: var(--c-surface);
}
.opt .opt-letter { width: 28px; height: 28px; border-radius: 8px; background: var(--c-surface-2); display: grid; place-items: center; font-weight: 700; flex: none; font-size: 14px; }
.opt:hover { border-color: var(--c-primary); }
.opt.selected { border-color: var(--c-primary); background: var(--c-primary-050); }
.opt.selected .opt-letter { background: var(--c-primary); color: #fff; }
.opt.correct { border-color: var(--c-success); background: var(--c-success-bg); }
.opt.correct .opt-letter { background: var(--c-success); color: #fff; }
.opt.wrong { border-color: var(--c-danger); background: var(--c-danger-bg); }
.opt.wrong .opt-letter { background: var(--c-danger); color: #fff; }
.answer-input { margin-top: 14px; }
.practice-actions { display: flex; gap: 10px; margin-top: 20px; }
.practice-actions .btn { flex: 1; }

/* 判分弹层 */
.result-mark { width: 72px; height: 72px; border-radius: 50%; display: grid; place-items: center; margin: 0 auto 14px; }
.result-mark.correct { background: var(--c-success-bg); color: var(--c-success); }
.result-mark.wrong { background: var(--c-danger-bg); color: var(--c-danger); }
.result-mark svg { width: 40px; height: 40px; }
.result-title { text-align: center; font-size: 20px; font-weight: 700; margin-bottom: 4px; }
.result-answer { text-align: center; color: var(--c-text-2); font-size: 14px; margin-bottom: 16px; }
.explain-box { background: var(--c-surface-2); border-radius: var(--radius); padding: 14px; font-size: 14px; line-height: 1.65; margin-bottom: 14px; }
.explain-box .math { font-family: var(--mono); }
.wrong-note { display: flex; align-items: center; gap: 10px; background: var(--c-warning-bg); border: 1px solid #fde68a; border-radius: var(--radius); padding: 12px 14px; font-size: 13.5px; color: #92400e; margin-bottom: 14px; }
.related-kp { display: inline-flex; align-items: center; gap: 6px; background: var(--c-primary-050); color: var(--c-primary); padding: 6px 12px; border-radius: 999px; font-size: 13px; font-weight: 550; margin-bottom: 16px; }

/* ---------- 错题集（P3） ---------- */
.wrong-filters { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 16px; }
.wrong-list { display: flex; flex-direction: column; gap: 12px; }
.wrong-card { background: var(--c-surface); border: 1px solid var(--c-border); border-radius: var(--radius-lg); padding: 16px; box-shadow: var(--shadow-sm); }
.wrong-card.due { border-left: 4px solid var(--c-warning); }
.wrong-card .wc-top { display: flex; align-items: center; gap: 8px; margin-bottom: 10px; flex-wrap: wrap; }
.wrong-card .wc-kp { font-size: 12px; font-weight: 600; color: var(--c-primary); background: var(--c-primary-050); padding: 3px 10px; border-radius: 999px; }
.wrong-card .wc-stem { font-size: 15px; line-height: 1.55; margin-bottom: 10px; }
.wrong-card .wc-answers { display: grid; gap: 6px; font-size: 13.5px; margin-bottom: 12px; }
.wrong-card .wc-answers .wa { display: flex; gap: 8px; align-items: baseline; }
.wrong-card .wc-answers .wa .k { color: var(--c-text-3); flex: none; width: 78px; font-size: 12.5px; }
.wrong-card .wc-answers .wrong-ans { color: var(--c-danger); text-decoration: line-through; }
.wrong-card .wc-answers .correct-ans { color: var(--c-success); }
.wrong-card .wc-foot { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.wrong-card .wc-date { font-size: 12.5px; color: var(--c-text-2); }
.wrong-card .spacer { flex: 1; }

/* ---------- 周计划（P4） ---------- */
.week-plan { display: grid; grid-template-columns: repeat(7, minmax(120px, 1fr)); gap: 10px; overflow-x: auto; padding-bottom: 4px; }
.week-day { background: var(--c-surface); border: 1px solid var(--c-border); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-sm); min-height: 200px; display: flex; flex-direction: column; }
.week-day .wd-head { padding: 12px; text-align: center; border-bottom: 1px solid var(--c-border); background: var(--c-surface-2); }
.week-day .wd-head .d-name { font-weight: 700; font-size: 13px; }
.week-day .wd-head .d-date { font-size: 11px; color: var(--c-text-3); }
.week-day.today .wd-head { background: var(--c-primary); color: #fff; }
.week-day.today .wd-head .d-date { color: rgba(255,255,255,0.8); }
.week-day .wd-body { padding: 12px; display: flex; flex-direction: column; gap: 10px; flex: 1; }
.plan-item { border: 1px solid var(--c-border); border-radius: var(--radius-sm); padding: 10px; font-size: 12.5px; cursor: pointer; transition: all 0.15s; }
.plan-item:hover { border-color: var(--c-primary); }
.plan-item .pi-kp { font-weight: 650; font-size: 12.5px; }
.plan-item .pi-meta { color: var(--c-text-2); font-size: 11.5px; margin-top: 4px; }
.plan-item.done { background: var(--c-success-bg); border-color: #bbf7d0; }
.plan-item.done .pi-kp { color: var(--c-success); }
.plan-item .pi-check { display: inline-flex; width: 18px; height: 18px; border: 1.5px solid var(--c-border-strong); border-radius: 6px; margin-right: 6px; align-items: center; justify-content: center; vertical-align: -3px; }
.plan-item.done .pi-check { background: var(--c-success); border-color: var(--c-success); color: #fff; }
.week-legend { display: flex; gap: 16px; font-size: 12px; color: var(--c-text-2); margin: 12px 0 4px; align-items: center; flex-wrap: wrap; }

/* ---------- 学习报告（P5 / P9） ---------- */
.report-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.report-grid .span-2 { grid-column: 1 / -1; }
.metric-ring { display: flex; flex-direction: column; align-items: center; }
.metric-ring .ring-label { font-size: 13px; color: var(--c-text-2); margin-top: 6px; }
.kp-progress-row { display: flex; align-items: center; gap: 12px; padding: 10px 0; border-bottom: 1px solid var(--c-border); }
.kp-progress-row:last-child { border-bottom: none; }
.kp-progress-row .kp-name { flex: 1; font-size: 14px; font-weight: 550; }
.kp-progress-row .kp-pct { font-size: 13px; color: var(--c-text-2); width: 42px; text-align: right; font-variant-numeric: tabular-nums; }
.kp-progress-row .progress { flex: 1; max-width: 180px; }
.ai-advice { background: linear-gradient(135deg, var(--c-primary-050), #f5f3ff); border: 1px solid var(--c-primary-100); border-radius: var(--radius); padding: 16px; line-height: 1.7; font-size: 14.5px; }
.ai-advice .advice-title { display: flex; align-items: center; gap: 8px; font-weight: 700; color: var(--c-primary); margin-bottom: 8px; }

/* ---------- 家长：孩子列表（P6） ---------- */
.children-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 16px; }
.child-card { background: var(--c-surface); border: 1px solid var(--c-border); border-radius: var(--radius-lg); padding: 20px; box-shadow: var(--shadow-sm); cursor: pointer; transition: all 0.15s; position: relative; }
.child-card:hover { border-color: var(--c-primary); box-shadow: var(--shadow); transform: translateY(-2px); }
.child-card.active { border-color: var(--c-primary); box-shadow: 0 0 0 3px var(--c-primary-100); }
.child-avatar { width: 52px; height: 52px; border-radius: 50%; display: grid; place-items: center; color: #fff; font-size: 20px; font-weight: 700; margin-bottom: 12px; }
.child-card .cc-name { font-size: 17px; font-weight: 700; }
.child-card .cc-meta { font-size: 13px; color: var(--c-text-2); margin-top: 2px; }
.child-card .cc-stats { display: flex; gap: 14px; margin-top: 14px; font-size: 12.5px; color: var(--c-text-2); }
.child-card.add-card { display: flex; flex-direction: column; align-items: center; justify-content: center; border-style: dashed; color: var(--c-text-2); min-height: 160px; }
.child-card.add-card:hover { color: var(--c-primary); }
.child-card.add-card svg { width: 30px; height: 30px; margin-bottom: 8px; }

/* ---------- 家长：档案录入 / 知识地图（P7） ---------- */
.form-card { max-width: 760px; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.form-grid .full { grid-column: 1 / -1; }
.step-indicator { display: flex; gap: 8px; align-items: center; margin-bottom: 20px; }
.step-indicator .step { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--c-text-3); font-weight: 550; }
.step-indicator .step .n { width: 22px; height: 22px; border-radius: 50%; background: var(--c-border); display: grid; place-items: center; font-size: 12px; }
.step-indicator .step.active { color: var(--c-primary); }
.step-indicator .step.active .n { background: var(--c-primary); color: #fff; }
.step-indicator .step.done { color: var(--c-success); }
.step-indicator .step.done .n { background: var(--c-success); color: #fff; }
.step-indicator .conn { flex: 1; height: 2px; background: var(--c-border); border-radius: 2px; }

/* 知识地图 */
.km-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 10px; }
.km-node { border: 1px solid var(--c-border); border-radius: var(--radius); padding: 12px; cursor: pointer; transition: all 0.15s; text-align: center; }
.km-node:hover { border-color: var(--c-primary); }
.km-node .km-name { font-size: 13px; font-weight: 600; line-height: 1.3; }
.km-node .km-level { margin-top: 8px; font-size: 12px; font-weight: 600; }
.km-node[data-level="mastered"] { border-color: #bbf7d0; background: var(--c-success-bg); }
.km-node[data-level="developing"] { border-color: #fde68a; background: var(--c-warning-bg); }
.km-node[data-level="gap"] { border-color: #fecaca; background: var(--c-danger-bg); }
.km-node[data-level="unassessed"] { border-style: dashed; }
.level-legend { display: flex; gap: 14px; font-size: 12px; color: var(--c-text-2); margin: 12px 0; flex-wrap: wrap; }

/* ---------- 家长：知识库（P8） ---------- */
.material-row { display: flex; align-items: center; gap: 14px; padding: 14px 4px; border-bottom: 1px solid var(--c-border); }
.material-row:last-child { border-bottom: none; }
.mat-icon { width: 40px; height: 40px; border-radius: 10px; background: var(--c-surface-2); display: grid; place-items: center; flex: none; }
.mat-icon svg { width: 22px; height: 22px; color: var(--c-primary); }
.mat-info { flex: 1; min-width: 0; }
.mat-name { font-weight: 600; font-size: 14px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.mat-meta { font-size: 12px; color: var(--c-text-2); margin-top: 2px; }
.mat-tags { display: flex; gap: 6px; flex-wrap: wrap; }

/* ---------- 通用页头 ---------- */
.page-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 16px; margin-bottom: 20px; flex-wrap: wrap; }
.page-head .ph-title { font-size: 22px; font-weight: 700; }
.page-head .ph-sub { color: var(--c-text-2); font-size: 14px; margin-top: 4px; }
.page-head .ph-actions { display: flex; gap: 10px; flex-wrap: wrap; }

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .app-sidebar { position: fixed; left: 0; top: 0; bottom: 0; transform: translateX(-100%); transition: transform 0.2s; z-index: 80; box-shadow: var(--shadow-lg); }
  .app-sidebar.open { transform: none; }
  .menu-btn { display: inline-flex; }
  .app-main { padding: 16px; }
  .report-grid { grid-template-columns: 1fr; }
  .form-grid { grid-template-columns: 1fr; }
  .week-plan { grid-template-columns: repeat(7, minmax(110px, 1fr)); }
}
@media (max-width: 640px) {
  .stat-grid, .quick-grid { grid-template-columns: 1fr 1fr; }
  .practice-actions { flex-direction: column; }
}

/* 学生端平板优先：内容最大宽度居中（改左侧栏后无底部导航，去除底部留白） */
.student-wrap { max-width: 780px; margin: 0 auto; }
.coach-wrap { max-width: 1100px; margin: 0 auto; }
@media (min-width: 1024px) {
  .student-wrap { max-width: 840px; }
  .stat-grid { grid-template-columns: repeat(4, 1fr); }
}

/* ---------- 作业批改（H 系列） ---------- */
.hw-upload { margin-bottom: 16px; }
.hw-list { display: flex; flex-direction: column; gap: 12px; }
.hw-row { display: flex; align-items: center; gap: 14px; padding: 14px 4px; border-bottom: 1px solid var(--c-border); }
.hw-row:last-child { border-bottom: none; }
.hw-icon { width: 40px; height: 40px; border-radius: 10px; background: var(--c-surface-2); display: grid; place-items: center; flex: none; }
.hw-icon svg { width: 22px; height: 22px; color: var(--c-primary); }
.hw-info { flex: 1; min-width: 0; }
.hw-name { font-weight: 600; font-size: 14px; }
.hw-meta { font-size: 12px; color: var(--c-text-2); margin-top: 2px; }
.hw-result-head { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; margin-bottom: 16px; }
.hw-score-card { display: flex; align-items: center; gap: 16px; background: var(--c-surface); border: 1px solid var(--c-border); border-radius: var(--radius-lg); padding: 18px; box-shadow: var(--shadow-sm); }
.hw-score-card .score-num { font-size: 34px; font-weight: 700; line-height: 1; }
.hw-items { display: flex; flex-direction: column; gap: 12px; }
.hw-item { background: var(--c-surface); border: 1px solid var(--c-border); border-radius: var(--radius-lg); padding: 16px; box-shadow: var(--shadow-sm); }
.hw-item.correct { border-left: 4px solid var(--c-success); }
.hw-item.incorrect { border-left: 4px solid var(--c-danger); }
.hw-item .hi-top { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-bottom: 10px; }
.hw-item .hi-stem { font-size: 15px; line-height: 1.55; margin-bottom: 8px; }
.hw-item .hi-answers { display: grid; gap: 6px; font-size: 13.5px; margin-bottom: 10px; }
.hw-item .hi-answers .wa { display: flex; gap: 8px; align-items: baseline; }
.hw-item .hi-answers .wa .k { color: var(--c-text-3); flex: none; width: 84px; font-size: 12.5px; }
.hw-item .hi-answers .wrong-ans { color: var(--c-danger); }
.hw-item .hi-answers .correct-ans { color: var(--c-success); }
.hw-item .hi-explain { background: var(--c-surface-2); border-radius: var(--radius); padding: 12px; font-size: 13.5px; line-height: 1.6; margin-bottom: 10px; }
.hw-item .hi-kp { display: inline-flex; align-items: center; gap: 6px; background: var(--c-primary-050); color: var(--c-primary); padding: 4px 10px; border-radius: 999px; font-size: 12.5px; font-weight: 550; }
.hw-item .hi-added { display: inline-flex; align-items: center; gap: 6px; background: var(--c-warning-bg); color: #92400e; padding: 4px 10px; border-radius: 999px; font-size: 12.5px; font-weight: 550; }

/* ---------- 教练系统（K 系列） ---------- */
.coach-stat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.coach-cta { display: flex; align-items: center; justify-content: space-between; gap: 16px; background: linear-gradient(135deg, #4f46e5, #7c6cf0); border-radius: var(--radius-lg); padding: 20px; color: #fff; margin-top: 16px; }
.coach-cta .cta-title { font-weight: 700; font-size: 16px; }
.coach-cta .cta-sub { opacity: 0.85; font-size: 13px; margin-top: 2px; }
.coach-cta .btn { background: #fff; color: var(--c-primary); border: none; }
.breakdown-bar { display: flex; align-items: center; gap: 12px; padding: 10px 0; border-bottom: 1px solid var(--c-border); }
.breakdown-bar:last-child { border-bottom: none; }
.breakdown-bar .bb-name { flex: 1; font-size: 14px; font-weight: 550; }
.breakdown-bar .bb-num { font-size: 13px; color: var(--c-text-2); width: 80px; text-align: right; font-variant-numeric: tabular-nums; }
.breakdown-bar .progress { flex: 1; max-width: 220px; }
.train-row { display: flex; align-items: center; gap: 12px; padding: 12px 4px; border-bottom: 1px solid var(--c-border); }
.train-row:last-child { border-bottom: none; }
.train-row .tr-icon { width: 34px; height: 34px; border-radius: 9px; display: grid; place-items: center; flex: none; }
.train-row .tr-info { flex: 1; min-width: 0; }
.train-row .tr-title { font-weight: 600; font-size: 14px; }
.train-row .tr-meta { font-size: 12px; color: var(--c-text-2); margin-top: 2px; }
.tag-edit-row { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 8px; }
.coverage-tree { display: flex; flex-direction: column; gap: 10px; }
.cov-domain { background: var(--c-surface); border: 1px solid var(--c-border); border-radius: var(--radius-lg); padding: 16px; box-shadow: var(--shadow-sm); }
.cov-domain .cd-name { font-weight: 700; font-size: 15px; margin-bottom: 10px; }
.cov-strand { margin: 8px 0 4px 8px; }
.cov-strand .cs-name { font-size: 13px; font-weight: 600; color: var(--c-text-2); margin-bottom: 6px; }
.cov-topic { margin-left: 14px; }
.cov-topic .ct-name { font-size: 12.5px; font-weight: 550; color: var(--c-text-2); margin: 6px 0 4px; }
.cov-points { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 8px; }
.cov-point { display: flex; align-items: center; gap: 8px; border: 1px solid var(--c-border); border-radius: var(--radius-sm); padding: 8px 10px; font-size: 12.5px; }
.cov-point .cp-dot { width: 9px; height: 9px; border-radius: 50%; flex: none; }
.cov-point.covered { background: var(--c-success-bg); border-color: #bbf7d0; }
.cov-point.covered .cp-dot { background: var(--c-success); }
.cov-point.uncovered { border-style: dashed; }
.cov-point.uncovered .cp-dot { background: var(--c-border-strong); }
.cov-point .cp-name { flex: 1; font-weight: 550; }
.cov-point .cp-count { font-size: 11.5px; color: var(--c-text-3); }
@media (max-width: 900px) {
  .coach-stat-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .coach-stat-grid { grid-template-columns: 1fr 1fr; }
  .hw-score-card { flex-direction: column; align-items: flex-start; }
}

/* ---------- 8 学科板块（做题练习 landing） ---------- */
.subject-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 12px; }
.subject-card {
  background: var(--c-surface); border: 1px solid var(--c-border); border-radius: var(--radius-lg);
  padding: 18px 16px; box-shadow: var(--shadow-sm); cursor: pointer; transition: all 0.15s;
  display: flex; flex-direction: column; gap: 8px;
}
.subject-card.ready:hover { border-color: var(--c-primary); box-shadow: var(--shadow); transform: translateY(-2px); }
.subject-card.coming { border-color: #fde68a; }
.subject-card.coming:hover { border-color: var(--c-warning); }
.subject-card.locked { background: var(--c-surface-2); opacity: 0.72; cursor: pointer; }
.subject-card.locked .sc-avatar { color: #fff; }
.sc-avatar {
  width: 42px; height: 42px; border-radius: 12px; display: grid; place-items: center;
  color: #fff; font-size: 18px; font-weight: 700; flex: none;
}
.sc-avatar svg { width: 22px; height: 22px; }
.sc-name { font-size: 15px; font-weight: 700; }
.sc-meta { font-size: 12.5px; color: var(--c-text-2); line-height: 1.4; }
.subject-card.coming .sc-meta { color: var(--c-warning); }
.subject-card.locked .sc-meta { color: var(--c-text-3); }
.sc-action { display: flex; align-items: center; gap: 6px; font-size: 13px; font-weight: 650; color: var(--c-primary); margin-top: auto; }
.sc-action svg { width: 16px; height: 16px; }
.board-legend { display: flex; flex-wrap: wrap; gap: 14px; font-size: 12px; color: var(--c-text-2); margin-top: 14px; }
.board-legend .legend-item { display: inline-flex; align-items: center; gap: 6px; }
.board-legend .legend-swatch { width: 10px; height: 10px; border-radius: 3px; }

/* ---------- 错题集：按学科筛选 + 学科徽标 ---------- */
.wrong-subject-filter { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; flex-wrap: wrap; }
.wrong-subject-filter .wsf-label { font-size: 13px; font-weight: 650; color: var(--c-text-2); }
.subject-badge::before { display: none; }

/* ---------- 报告分科卡片（subject_breakdown） ---------- */
.subject-breakdown { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 14px; }
.sb-card { border: 1px solid var(--c-border); border-radius: var(--radius); padding: 16px; background: var(--c-surface-2); }
.sb-head { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
.sb-avatar { width: 34px; height: 34px; border-radius: 10px; display: grid; place-items: center; color: #fff; font-weight: 700; flex: none; }
.sb-name { font-weight: 700; font-size: 15px; }
.sb-body { display: flex; align-items: center; gap: 14px; }
.sb-donut { flex: none; }
.sb-stats { flex: 1; display: grid; grid-template-columns: 1fr 1fr; gap: 8px 12px; }
.sb-stat { display: flex; flex-direction: column; }
.sb-stat .k { font-size: 11.5px; color: var(--c-text-3); }
.sb-stat .v { font-size: 16px; font-weight: 700; }
.sb-weak { margin-top: 12px; border-top: 1px solid var(--c-border); padding-top: 10px; }
.sb-weak-title { font-size: 12.5px; font-weight: 650; color: var(--c-text-2); margin-bottom: 4px; }

/* ---------- 材料区（shared-files） ---------- */
.file-head, .file-row { display: grid; grid-template-columns: 40px 1fr 88px auto; gap: 12px; align-items: center; padding: 10px 4px; }
.file-head { border-bottom: 1px solid var(--c-border); font-size: 12px; text-transform: uppercase; letter-spacing: 0.03em; color: var(--c-text-3); font-weight: 650; }
.file-head .fh-uploader { grid-column: 2; }
.file-row { border-bottom: 1px solid var(--c-border); }
.file-row:last-child { border-bottom: none; }
.file-row .mat-icon { grid-column: 1; }
.file-row .mat-info { grid-column: 2; }
.file-date { font-size: 12.5px; color: var(--c-text-2); }
.file-actions { display: flex; gap: 8px; justify-content: flex-end; flex-wrap: wrap; }
@media (max-width: 640px) {
  .file-head { display: none; }
  .file-row { grid-template-columns: 40px 1fr; }
  .file-row .mat-info { grid-column: 2; }
  .file-date { grid-column: 2; }
  .file-actions { grid-column: 2; justify-content: flex-start; }
}

/* ---------- AI 老师分步讲解（E 系列） ---------- */
.explain-stem { font-size: 15.5px; font-weight: 600; line-height: 1.5; margin-bottom: 8px; }
.explain-meta { display: flex; align-items: center; gap: 8px; margin-bottom: 14px; font-size: 13px; color: var(--c-text-2); flex-wrap: wrap; }
.explain-body { min-height: 120px; }
.explain-steps { display: flex; flex-direction: column; }
.explain-step { display: flex; gap: 12px; padding-bottom: 16px; position: relative; }
.explain-step:not(:last-child)::after { content: ""; position: absolute; left: 17px; top: 42px; bottom: 0; width: 2px; background: var(--c-border); }
.explain-step .es-icon { width: 34px; height: 34px; border-radius: 10px; display: grid; place-items: center; flex: none; }
.explain-step .es-icon svg { width: 18px; height: 18px; }
.explain-step .es-body { flex: 1; min-width: 0; padding-top: 2px; }
.explain-step .es-title { font-weight: 700; font-size: 14px; display: flex; align-items: center; gap: 8px; }
.explain-step .es-no { width: 18px; height: 18px; border-radius: 50%; color: #fff; font-size: 11px; display: inline-flex; align-items: center; justify-content: center; flex: none; }
.explain-step .es-content { font-size: 13.5px; line-height: 1.7; color: var(--c-text); margin-top: 6px; }
.explain-loading { display: flex; flex-direction: column; align-items: center; gap: 12px; padding: 32px 0; color: var(--c-text-2); font-size: 13.5px; }
.explain-error { display: flex; flex-direction: column; align-items: center; gap: 10px; padding: 28px 0; color: var(--c-danger); font-size: 13.5px; }
.explain-error svg { width: 34px; height: 34px; }
.explain-foot { display: flex; justify-content: flex-end; gap: 10px; margin-top: 16px; }
.spinner { width: 22px; height: 22px; border: 3px solid var(--c-border-strong); border-top-color: var(--c-primary); border-radius: 50%; animation: spin 0.8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- 家庭绑定（第六轮） ---------- */
.binding-code {
  font-family: var(--mono);
  font-size: 34px;
  font-weight: 800;
  letter-spacing: 6px;
  text-align: center;
  padding: 22px 10px;
  background: var(--c-surface-2);
  border-radius: var(--radius-lg);
  user-select: all;
}
.member-list { display: flex; flex-direction: column; gap: 10px; }
.member-row { display: flex; align-items: center; gap: 12px; padding: 10px; border: 1px solid var(--c-border); border-radius: var(--radius-lg); }
.member-avatar { width: 38px; height: 38px; border-radius: 50%; background: var(--c-primary-100); color: var(--c-primary); display: grid; place-items: center; font-weight: 700; flex: none; }
.member-info { flex: 1; min-width: 0; }
.member-name { font-weight: 650; }
.member-time { font-size: 12px; color: var(--c-text-2); }

/* 孩子卡片解绑入口（hover 显示） */
.child-card .cc-unbind {
  position: absolute; top: 10px; right: 10px; width: 28px; height: 28px;
  display: grid; place-items: center; border-radius: 8px; border: 1px solid transparent;
  background: transparent; color: var(--c-text-3); cursor: pointer;
  opacity: 0; transition: opacity 0.12s, background 0.12s, color 0.12s;
}
.child-card:hover .cc-unbind, .child-card .cc-unbind:focus-visible { opacity: 1; }
.child-card .cc-unbind:hover { background: var(--c-danger-bg); color: var(--c-danger); }

/* admin 学生档案只读绑定关系 */
.bp-list { display: flex; flex-direction: column; gap: 4px; }
.bp-row { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }