.header {
  max-width: 1240px;
  margin: 0 auto;
  padding: 24px 20px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand-badge {
  width: 36px; height: 36px;
  background: linear-gradient(135deg, #4077ee, #2b55b8);
  color: #fff; border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 15px;
  box-shadow: 0 4px 12px rgba(64, 119, 238, 0.28);
}
.brand-title { font-size: 19px; font-weight: 700; letter-spacing: -0.3px; display: flex; align-items: center; gap: 8px; }
.brand-sub { font-size: 11px; color: var(--muted); font-weight: 600; letter-spacing: 0.5px; text-transform: uppercase; }
.role-tag {
  font-size: 11px; font-weight: 700; padding: 3px 8px; border-radius: 6px;
  background: var(--blue-soft); color: var(--blue); border: 1px solid rgba(64, 119, 238, 0.2);
}
.header-actions { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.date-picker-wrap {
  display: flex; align-items: center;
  background: var(--card-bg); border: 1px solid var(--border);
  padding: 6px 12px; border-radius: 10px;
  font-size: 13px; font-weight: 600; color: var(--text);
  box-shadow: var(--shadow-sm);
}
.date-picker-wrap input[type="date"] { border: none; background: transparent; color: inherit; font-weight: 600; cursor: pointer; }

.btn-link-subtle {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 12px; border-radius: 10px;
  background: var(--card-bg); border: 1px solid var(--border);
  font-size: 12px; font-weight: 600; color: var(--text);
  box-shadow: var(--shadow-sm); transition: all 0.15s;
}
.btn-link-subtle:hover { border-color: var(--blue); color: var(--blue); }

.container { max-width: 1240px; margin: 0 auto; padding: 0 20px 60px; display: grid; gap: 22px; }

/* 顶部概览栅格 */
.overview-grid { display: grid; grid-template-columns: 240px 1fr 380px; gap: 18px; }
@media (max-width: 1024px) { .overview-grid { grid-template-columns: 1fr; } }

.glass-card {
  background: var(--card-bg); backdrop-filter: blur(18px);
  border: 1px solid var(--border); border-radius: 14px;
  padding: 20px; box-shadow: var(--shadow-sm);
}
.card-header-line { display: flex; justify-content: space-between; align-items: center; margin-bottom: 14px; }
.card-title { font-size: 13px; font-weight: 700; color: var(--text); text-transform: uppercase; letter-spacing: 0.4px; display: flex; align-items: center; gap: 6px; }

/* 环形进度条 */
.progress-ring-box { display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; }
.ring-svg { width: 124px; height: 124px; transform: rotate(-90deg); }
.ring-bg { fill: none; stroke: rgba(130, 151, 181, 0.18); stroke-width: 9; }
.ring-val { fill: none; stroke: var(--blue); stroke-width: 9; stroke-linecap: round; transition: stroke-dashoffset 0.6s cubic-bezier(0.16, 1, 0.3, 1); }
.ring-text { position: absolute; display: flex; flex-direction: column; align-items: center; }
.ring-percent { font-size: 25px; font-weight: 800; color: var(--text); line-height: 1; }
.ring-label { font-size: 11px; color: var(--muted); font-weight: 600; margin-top: 4px; }

.metrics-four { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.metric-item { background: var(--card-bg-subtle); border: 1px solid var(--border-subtle); border-radius: 10px; padding: 13px 14px; display: flex; flex-direction: column; justify-content: center; }
.metric-val { font-size: 22px; font-weight: 800; color: var(--text); font-variant-numeric: tabular-nums; }
.metric-desc { font-size: 11px; color: var(--muted); font-weight: 600; margin-top: 2px; }

/* 状态呼吸灯 */
.status-pill {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 4px 10px; border-radius: 20px;
  font-size: 11px; font-weight: 700;
  background: var(--card-bg-subtle); border: 1px solid var(--border);
}
.status-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--muted); }
.status-dot.active { background: var(--success); box-shadow: 0 0 6px rgba(31, 164, 99, 0.5); }
.status-dot.warn { background: var(--warn); box-shadow: 0 0 6px rgba(230, 138, 0, 0.5); }
.status-dot.error { background: var(--danger); }

/* 学生端 Root 权限控制面板 */
.root-control-box { display: flex; flex-direction: column; gap: 10px; }
.shield-switch-row {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 12px; border-radius: 10px;
  background: var(--card-bg-subtle); border: 1px solid var(--border-subtle);
}
.switch-toggle { position: relative; display: inline-block; width: 40px; height: 22px; }
.switch-toggle input { opacity: 0; width: 0; height: 0; }
.switch-slider {
  position: absolute; cursor: pointer; inset: 0;
  background-color: rgba(130, 151, 181, 0.35);
  transition: .2s; border-radius: 22px;
}
.switch-slider:before {
  position: absolute; content: ""; height: 16px; width: 16px;
  left: 3px; bottom: 3px; background-color: white;
  transition: .2s; border-radius: 50%;
  box-shadow: 0 1px 4px rgba(0,0,0,0.15);
}
.switch-toggle input:checked + .switch-slider { background-color: var(--warn); }
.switch-toggle input:checked + .switch-slider:before { transform: translateX(18px); }

.mini-input-row { display: flex; gap: 6px; }
.mini-input {
  flex: 1; padding: 6px 10px; border-radius: 7px;
  border: 1px solid var(--border); background: #fff;
  font-size: 12px; color: var(--text);
}
.mini-btn {
  padding: 6px 12px; border-radius: 7px;
  border: 1px solid var(--border); background: #fff;
  font-size: 12px; font-weight: 600; color: var(--text);
  transition: all 0.15s;
}
.mini-btn:hover { border-color: var(--blue); color: var(--blue); }

/* 反审计日志流 */
.audit-list {
  max-height: 150px; overflow-y: auto;
  display: flex; flex-direction: column; gap: 6px;
  padding-right: 4px;
}
.audit-item {
  display: flex; align-items: center; gap: 8px;
  font-size: 11px; padding: 6px 10px; border-radius: 7px;
  background: var(--card-bg-subtle); border: 1px solid var(--border-subtle);
}
.audit-time { font-family: ui-monospace, monospace; color: var(--muted); font-weight: 600; }
.audit-action { font-weight: 700; color: var(--text); }
.audit-ip { font-family: ui-monospace, monospace; color: var(--blue); font-size: 10px; background: var(--blue-soft); padding: 1px 5px; border-radius: 4px; }
.audit-detail { color: var(--muted); flex: 1; text-align: right; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* ESP32-CAM 监控工作台 (Ruigent 浅色毛玻璃高级版) */
.monitor-studio-grid {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 20px;
}
@media (max-width: 960px) { .monitor-studio-grid { grid-template-columns: 1fr; } }

.cam-viewport-shell {
  position: relative;
  background: linear-gradient(180deg, rgba(235, 242, 250, 0.7), rgba(222, 232, 245, 0.85));
  border: 1px solid var(--border-strong);
  border-radius: 12px;
  min-height: 380px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  box-shadow: inset 0 2px 10px rgba(38, 55, 81, 0.04);
}
.cam-live-img {
  width: 100%;
  max-height: 460px;
  object-fit: contain;
  display: none;
  border-radius: 8px;
}
.cam-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 600;
  text-align: center;
  padding: 24px;
}
.cam-fps-badge {
  position: absolute;
  top: 12px;
  left: 12px;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border);
  padding: 5px 11px;
  border-radius: 8px;
  font-size: 11px;
  font-weight: 700;
  color: var(--text);
  font-family: ui-monospace, monospace;
  display: none;
  align-items: center;
  gap: 6px;
  box-shadow: var(--shadow-sm);
}
.cam-shield-banner {
  position: absolute;
  inset: 0;
  background: rgba(244, 247, 250, 0.94);
  backdrop-filter: blur(12px);
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 24px;
  text-align: center;
  color: var(--text);
  font-size: 14px;
  font-weight: 700;
  z-index: 10;
}

.cam-side-controls { display: flex; flex-direction: column; gap: 14px; justify-content: space-between; }
.cam-btn-stack { display: flex; flex-direction: column; gap: 8px; }
.cam-ctrl-btn {
  width: 100%;
  padding: 10px 14px;
  border-radius: 9px;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text);
  font-size: 13px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: all 0.15s;
  box-shadow: var(--shadow-sm);
}
.cam-ctrl-btn:hover:not(:disabled) { border-color: var(--blue); color: var(--blue); }
.cam-ctrl-btn:disabled { opacity: 0.45; cursor: not-allowed; }
.cam-ctrl-btn.primary { background: var(--blue); color: #fff; border-color: var(--blue); }
.cam-ctrl-btn.primary:hover:not(:disabled) { background: var(--blue-hover); color: #fff; }
.cam-ctrl-btn.active { background: var(--danger); color: #fff; border-color: var(--danger); }

.telemetry-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.telemetry-box {
  background: var(--card-bg-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: 8px 10px;
}
.telemetry-label { font-size: 10px; font-weight: 700; color: var(--muted); text-transform: uppercase; }
.telemetry-val { font-size: 13px; font-weight: 800; color: var(--text); font-family: ui-monospace, monospace; margin-top: 2px; }

.cam-log-box {
  background: var(--card-bg-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: 8px 10px;
  height: 92px;
  overflow-y: auto;
  font-family: ui-monospace, monospace;
  font-size: 11px;
  color: var(--muted);
  display: flex;
  flex-direction: column;
  gap: 3px;
}
.cam-log-line.ok { color: var(--success); font-weight: 600; }
.cam-log-line.err { color: var(--danger); font-weight: 600; }

/* 抓拍历史快照时间流 */
.snap-timeline-row {
  display: flex;
  gap: 12px;
  overflow-x: auto;
  padding-bottom: 6px;
  margin-top: 10px;
}
.snap-timeline-item {
  position: relative;
  min-width: 135px;
  width: 135px;
  height: 100px;
  border-radius: 8px;
  border: 1px solid var(--border);
  overflow: hidden;
  background: #fff;
  cursor: pointer;
  flex-shrink: 0;
  box-shadow: var(--shadow-sm);
}
.snap-thumb-img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.2s; }
.snap-timeline-item:hover .snap-thumb-img { transform: scale(1.05); }
.snap-info-tag {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  background: rgba(38, 55, 81, 0.75);
  backdrop-filter: blur(4px);
  color: #fff;
  font-size: 10px;
  font-weight: 600;
  padding: 3px 6px;
  text-align: center;
  font-family: ui-monospace, monospace;
}

/* 作业工作区主布局 */
.workspace-layout { display: grid; grid-template-columns: 350px 1fr; gap: 20px; }
@media (max-width: 880px) { .workspace-layout { grid-template-columns: 1fr; } }

.task-form-group { margin-bottom: 14px; }
.form-label { display: block; font-size: 12px; font-weight: 700; color: var(--muted); margin-bottom: 6px; text-transform: uppercase; letter-spacing: 0.3px; }
.subject-capsules { display: flex; flex-wrap: wrap; gap: 6px; }
.capsule-btn { padding: 5px 11px; border-radius: 20px; border: 1px solid var(--border); background: #fff; font-size: 12px; font-weight: 600; color: var(--text); transition: all 0.15s; }
.capsule-btn.active { background: var(--blue); color: #fff; border-color: var(--blue); }
.form-input { width: 100%; padding: 9px 12px; background: #fff; border: 1px solid var(--border); border-radius: 8px; font-size: 13px; color: var(--text); transition: border-color 0.2s; }
.form-input:focus { border-color: var(--blue); }
.submit-task-btn { width: 100%; padding: 10px; background: var(--blue); color: #fff; border: none; border-radius: 8px; font-size: 13px; font-weight: 700; transition: background 0.2s; margin-top: 6px; }
.submit-task-btn:hover { background: var(--blue-hover); }

.task-list-wrap { display: flex; flex-direction: column; gap: 14px; }
.task-item-card { background: var(--card-bg); border: 1px solid var(--border); border-radius: 12px; padding: 16px 18px; box-shadow: var(--shadow-sm); }
.task-item-card.completed { border-color: rgba(31, 164, 99, 0.4); background: rgba(255, 255, 255, 0.94); }
.task-top-row { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; }
.task-subject-tag { display: inline-block; padding: 3px 9px; border-radius: 6px; font-size: 11px; font-weight: 700; margin-bottom: 6px; }

.tag-语文 { background: rgba(230, 80, 80, 0.1); color: #d03030; }
.tag-数学 { background: rgba(64, 119, 238, 0.1); color: #2e62ce; }
.tag-英语 { background: rgba(20, 160, 140, 0.1); color: #118270; }
.tag-物理 { background: rgba(140, 70, 220, 0.1); color: #722cb5; }
.tag-化学 { background: rgba(230, 140, 0, 0.1); color: #b86e00; }
.tag-生物 { background: rgba(40, 170, 90, 0.1); color: #1b8744; }
.tag-其他 { background: rgba(110, 125, 145, 0.1); color: #506075; }

.task-title-text { font-size: 15px; font-weight: 700; color: var(--text); }
.task-detail-text { font-size: 13px; color: var(--muted); margin-top: 4px; white-space: pre-wrap; }
.task-status-selector { padding: 4px 8px; border-radius: 6px; border: 1px solid var(--border); font-size: 12px; font-weight: 600; background: #fff; cursor: pointer; }
.task-status-selector.pending { color: var(--muted); }
.task-status-selector.in_progress { color: var(--warn); border-color: rgba(230, 138, 0, 0.4); }
.task-status-selector.completed { color: var(--success); border-color: rgba(31, 164, 99, 0.4); }

.upload-dropzone { margin-top: 14px; border: 1px dashed var(--border-strong); border-radius: 8px; padding: 10px 14px; background: rgba(255, 255, 255, 0.5); display: flex; align-items: center; justify-content: space-between; gap: 12px; cursor: pointer; transition: all 0.2s; }
.upload-dropzone:hover, .upload-dropzone.dragover { border-color: var(--blue); background: var(--blue-soft); }
.upload-hint { font-size: 12px; color: var(--muted); }
.upload-btn-mini { padding: 4px 10px; border-radius: 6px; background: #fff; border: 1px solid var(--border); font-size: 11px; font-weight: 600; color: var(--text); }

.submissions-gallery { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 12px; }
.sub-thumb-card { position: relative; width: 90px; height: 90px; border-radius: 8px; border: 1px solid var(--border); overflow: hidden; background: #fff; box-shadow: var(--shadow-sm); cursor: pointer; }
.sub-thumb-img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.2s; }
.sub-thumb-card:hover .sub-thumb-img { transform: scale(1.05); }
.sub-badge { position: absolute; top: 4px; left: 4px; font-size: 9px; font-weight: 700; padding: 2px 5px; border-radius: 4px; backdrop-filter: blur(4px); }
.sub-badge.approved { background: rgba(31, 164, 99, 0.85); color: #fff; }
.sub-badge.revision_needed { background: rgba(224, 75, 75, 0.85); color: #fff; }
.sub-badge.unreviewed { background: rgba(38, 55, 81, 0.65); color: #fff; }
.sub-del-btn { position: absolute; top: 4px; right: 4px; width: 20px; height: 20px; background: rgba(38, 55, 81, 0.65); color: #fff; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 12px; border: none; opacity: 0; transition: opacity 0.2s; }
.sub-thumb-card:hover .sub-del-btn, .snap-timeline-item:hover .sub-del-btn { opacity: 1; }

.parent-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(360px, 1fr)); gap: 18px; }
.parent-task-card { background: var(--card-bg); border: 1px solid var(--border); border-radius: 14px; padding: 18px; box-shadow: var(--shadow-sm); }
.parent-images-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(105px, 1fr)); gap: 10px; margin-top: 12px; }
.review-buttons-row { display: flex; gap: 6px; }
.review-btn { flex: 1; padding: 6px; border-radius: 6px; font-size: 11px; font-weight: 700; border: 1px solid var(--border); background: #fff; transition: all 0.15s; }
.review-btn.approve { color: var(--success); border-color: rgba(31, 164, 99, 0.4); }
.review-btn.approve:hover { background: var(--success-soft); }
.review-btn.revise { color: var(--danger); border-color: rgba(224, 75, 75, 0.4); }
.review-btn.revise:hover { background: var(--danger-soft); }

.modal-overlay { position: fixed; inset: 0; background: rgba(18, 28, 44, 0.78); backdrop-filter: blur(8px); z-index: 1000; display: none; align-items: center; justify-content: center; flex-direction: column; padding: 20px; }
.modal-overlay.active { display: flex; }
.modal-toolbar { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
.modal-tool-btn { padding: 6px 14px; background: rgba(255, 255, 255, 0.18); border: 1px solid rgba(255, 255, 255, 0.3); color: #fff; border-radius: 8px; font-size: 13px; font-weight: 600; transition: background 0.15s; }
.modal-tool-btn:hover { background: rgba(255, 255, 255, 0.28); }
.modal-img-container { max-width: 90vw; max-height: 80vh; display: flex; align-items: center; justify-content: center; overflow: hidden; }
.modal-img-container img { max-width: 100%; max-height: 80vh; object-fit: contain; border-radius: 6px; transition: transform 0.25s ease-out; }

.toast { position: fixed; bottom: 24px; right: 24px; background: rgba(38, 55, 81, 0.95); color: #fff; padding: 12px 20px; border-radius: 10px; font-size: 13px; font-weight: 600; box-shadow: 0 10px 30px rgba(0,0,0,0.3); z-index: 99999; opacity: 0; transform: translateY(10px); transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1); pointer-events: none; }
.toast.show { opacity: 1; transform: translateY(0); }
.empty-placeholder { text-align: center; padding: 40px 20px; color: var(--muted); font-size: 13px; }

.icon-inline { display: inline-flex; align-items: center; justify-content: center; vertical-align: -2px; margin-right: 4px; }
.btn-icon-subtle { border: none; background: transparent; color: var(--muted); padding: 4px; border-radius: 6px; display: inline-flex; align-items: center; justify-content: center; transition: all 0.15s; }
.btn-icon-subtle:hover { background: rgba(38, 55, 81, 0.08); color: var(--danger); }

/* ==============================================================================
   RUIGENT STUDY-OS 4.0 核心现代化组件库扩充 (移动端响应式 / 新知识 / 计划 / 锁屏)
   ============================================================================== */

/* 顶部导航与大屏 Tab 栏 */
.tab-navigation-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--card-bg-subtle);
  padding: 6px;
  border-radius: 12px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  margin-bottom: 20px;
}
.tab-nav-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: 8px;
  border: none;
  background: transparent;
  font-size: 13px;
  font-weight: 700;
  color: var(--muted);
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}
.tab-nav-btn:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.5);
}
.tab-nav-btn.active {
  background: #fff;
  color: var(--blue);
  box-shadow: 0 2px 8px rgba(38, 55, 81, 0.08);
}
.tab-badge {
  font-size: 10px;
  font-weight: 800;
  padding: 1px 6px;
  border-radius: 10px;
  background: var(--border-subtle);
  color: var(--muted);
}
.tab-nav-btn.active .tab-badge {
  background: var(--blue-soft);
  color: var(--blue);
}

/* 手机移动端底部导航栏 (仅在小屏展示) */
.mobile-bottom-nav {
  display: none;
}
@media (max-width: 768px) {
  .header {
    padding: 16px 14px 10px;
  }
  .brand-title {
    font-size: 16px;
  }
  .container {
    padding: 0 12px calc(80px + env(safe-area-inset-bottom));
  }
  .tab-navigation-bar {
    display: none; /* 移动端隐藏顶部 Tab，转为底部常驻 */
  }
  .mobile-bottom-nav {
    display: flex;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: calc(58px + env(safe-area-inset-bottom));
    padding-bottom: env(safe-area-inset-bottom);
    background: rgba(255, 255, 255, 0.94);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-top: 1px solid var(--border);
    box-shadow: 0 -4px 20px rgba(38, 55, 81, 0.06);
    z-index: 999;
  }
  .mobile-nav-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 3px;
    border: none;
    background: transparent;
    color: var(--muted);
    font-size: 10px;
    font-weight: 700;
    padding: 4px 0;
    transition: all 0.15s;
  }
  .mobile-nav-item.active {
    color: var(--blue);
  }
  .mobile-nav-item svg {
    width: 20px;
    height: 20px;
  }
  .overview-grid {
    grid-template-columns: 1fr;
  }
  .parent-grid {
    grid-template-columns: 1fr;
  }
  .monitor-studio-grid {
    grid-template-columns: 1fr;
  }
}

/* 板块切换容器 */
.view-panel {
  display: none;
  animation: fadeIn 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}
.view-panel.active {
  display: grid;
  gap: 20px;
}
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ====== 今日新知识板块 ====== */
.knowledge-layout {
  display: grid;
  grid-template-columns: 380px 1fr;
  gap: 20px;
  align-items: start;
}
@media (max-width: 992px) {
  .knowledge-layout {
    grid-template-columns: 1fr;
  }
}

.subject-filter-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}
.chip-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 20px;
  border: 1px solid var(--border);
  background: var(--card-bg);
  font-size: 12px;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  transition: all 0.15s;
}
.chip-btn:hover {
  border-color: var(--blue);
}
.chip-btn.active {
  background: var(--blue);
  color: #fff;
  border-color: var(--blue);
}
.chip-count {
  font-size: 10px;
  font-weight: 700;
  padding: 1px 5px;
  border-radius: 8px;
  background: rgba(0, 0, 0, 0.08);
}
.chip-btn.active .chip-count {
  background: rgba(255, 255, 255, 0.25);
}

.knowledge-card-list {
  display: grid;
  gap: 14px;
}
.knowledge-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px 18px;
  box-shadow: var(--shadow-sm);
  position: relative;
  transition: all 0.15s;
}
.knowledge-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--border-strong);
}
.knowledge-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}
.knowledge-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 8px;
}
.knowledge-content {
  font-size: 13px;
  line-height: 1.6;
  color: #33445c;
  white-space: pre-wrap;
  margin: 8px 0 12px;
}
.knowledge-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 11px;
  color: var(--muted);
  border-top: 1px solid var(--border-subtle);
  padding-top: 8px;
}
.mastery-stars {
  display: flex;
  gap: 3px;
  color: #f5a623;
  font-size: 12px;
}

/* ====== 长期计划与高考倒计时 ====== */
.countdown-banner {
  background: linear-gradient(135deg, #1f2d40 0%, #263852 100%);
  color: #fff;
  border-radius: 16px;
  padding: 24px 28px;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
}
.countdown-main {
  display: flex;
  align-items: baseline;
  gap: 8px;
}
.countdown-number {
  font-size: 48px;
  font-weight: 900;
  letter-spacing: -1px;
  color: #5ea1ff;
  line-height: 1;
}
.countdown-label {
  font-size: 14px;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.7);
}

.plan-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 18px;
}
@media (max-width: 600px) {
  .plan-cards-grid {
    grid-template-columns: 1fr;
  }
}
.plan-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 20px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.plan-category-badge {
  font-size: 11px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 6px;
  background: var(--blue-soft);
  color: var(--blue);
}
.progress-bar-bg {
  height: 8px;
  background: var(--border-subtle);
  border-radius: 4px;
  overflow: hidden;
  margin: 6px 0;
}
.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, #4077ee, #1fa463);
  border-radius: 4px;
  transition: width 0.3s ease;
}
.milestones-checklist {
  display: grid;
  gap: 8px;
}
.milestone-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 10px;
  background: rgba(255, 255, 255, 0.6);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  font-size: 12px;
  font-weight: 600;
}
.milestone-item.done {
  text-decoration: line-through;
  color: var(--muted);
  background: rgba(31, 164, 99, 0.04);
}
.milestone-check-btn {
  width: 20px;
  height: 20px;
  border-radius: 6px;
  border: 1.5px solid var(--border-strong);
  background: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: #fff;
  transition: all 0.15s;
}
.milestone-check-btn.checked {
  background: var(--success);
  border-color: var(--success);
}

/* ====== 锁屏与未授权开箱模态框 ====== */
.lock-screen-modal {
  position: fixed;
  inset: 0;
  background: rgba(18, 28, 44, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  z-index: 3000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 24px;
}
.lock-screen-modal.active {
  display: flex;
}
.lock-card {
  width: 100%;
  max-width: 420px;
  background: #fff;
  border-radius: 20px;
  padding: 32px 28px;
  text-align: center;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
}
.lock-icon-wrap {
  width: 56px;
  height: 56px;
  background: rgba(64, 119, 238, 0.08);
  color: var(--blue);
  border-radius: 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}
.lock-title {
  font-size: 18px;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 8px;
}
.lock-desc {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.5;
  margin-bottom: 22px;
}
.lock-input-group {
  display: flex;
  gap: 8px;
  margin-bottom: 14px;
}
.lock-input {
  flex: 1;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 13px;
  font-family: monospace;
}
.lock-submit-btn {
  padding: 10px 18px;
  background: var(--blue);
  color: #fff;
  border: none;
  border-radius: 10px;
  font-size: 13px;
  font-weight: 700;
}