/* 妮妮口算天天练 · 手机专属极速批改样式 */
:root {
  --bg: #f8fafc;
  --card-bg: #ffffff;
  --line: #e2e8f0;
  --ink: #0f172a;
  --sub: #64748b;
  --primary: #2563eb;
  --primary-light: #eff6ff;
  --success-bg: #f0fdf4;
  --success-border: #86efac;
  --success-text: #166534;
  --danger-bg: #fef2f2;
  --danger-border: #f87171;
  --danger-text: #b91c1c;
  --star: #f59e0b;
  --font-math: "STIX Two Math", "Cambria Math", "Noto Sans Math", "PingFang SC", "Microsoft YaHei", sans-serif;
  --safe-bottom: env(safe-area-inset-bottom, 16px);
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

body {
  margin: 0;
  padding: 0;
  background-color: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 15px;
  line-height: 1.5;
  user-select: none;
  -webkit-user-select: none;
  padding-bottom: calc(90px + var(--safe-bottom));
}

/* 顶部状态条 */
.app-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
  padding: 10px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-wrap {
  display: flex;
  flex-direction: column;
}
.brand-title {
  font-size: 16px;
  font-weight: 800;
  color: #1e293b;
  display: flex;
  align-items: center;
  gap: 6px;
}
.brand-tag {
  font-size: 11px;
  font-weight: 600;
  color: #3b82f6;
  background: #eff6ff;
  padding: 1px 6px;
  border-radius: 4px;
}
.brand-sub {
  font-size: 12px;
  color: var(--sub);
  margin-top: 1px;
}

.header-actions {
  display: flex;
  gap: 8px;
  align-items: center;
}
.btn-header {
  background: #f1f5f9;
  border: 1px solid var(--line);
  border-radius: 8px;
  height: 36px;
  padding: 0 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
  color: #334155;
  cursor: pointer;
  white-space: nowrap;
}
.btn-header:active { background: #e2e8f0; }
.btn-header.primary {
  background: #eff6ff;
  border-color: #bfdbfe;
  color: #2563eb;
}
.btn-icon {
  background: #f1f5f9;
  border: 1px solid var(--line);
  border-radius: 8px;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  color: #334155;
  cursor: pointer;
}
.btn-icon:active { background: #e2e8f0; }

/* 试卷信息卡片 */
.sheet-banner {
  margin: 12px 16px 8px;
  background: linear-gradient(135deg, #eff6ff 0%, #f0fdf4 100%);
  border: 1px solid #bfdbfe;
  border-radius: 12px;
  padding: 12px 14px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.sb-left h2 {
  margin: 0;
  font-size: 15px;
  font-weight: 800;
  color: #1e3a8a;
}
.sb-left p {
  margin: 2px 0 0;
  font-size: 12px;
  color: #475569;
}
.sb-right {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 4px;
}
.cloud-pill {
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 12px;
  background: #dcfce7;
  color: #166534;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 4px;
}

/* 批改视图切换工具栏 */
.view-tools {
  margin: 4px 16px 10px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.tip-text {
  font-size: 12px;
  color: #64748b;
}
.tip-text b { color: #ef4444; }
.mode-toggle {
  display: flex;
  background: #e2e8f0;
  padding: 2px;
  border-radius: 8px;
}
.mode-btn {
  border: none;
  background: transparent;
  padding: 4px 10px;
  font-size: 12px;
  font-weight: 600;
  color: #64748b;
  border-radius: 6px;
  cursor: pointer;
}
.mode-btn.active {
  background: #fff;
  color: #0f172a;
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}

/* ================= 48格气泡矩阵 (Direction C) ================= */
.matrix-container {
  padding: 0 12px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}

@media (max-width: 360px) {
  .matrix-container {
    grid-template-columns: repeat(3, 1fr);
    gap: 6px;
  }
}

.matrix-cell {
  position: relative;
  background: var(--card-bg);
  border: 1.5px solid var(--line);
  border-radius: 10px;
  padding: 6px 4px;
  min-height: 64px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  cursor: pointer;
  transition: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 1px 2px rgba(0,0,0,0.03);
}

.matrix-cell:active {
  transform: scale(0.95);
}

/* 题号 */
.mc-no {
  font-size: 11px;
  font-weight: 700;
  color: #94a3b8;
  margin-bottom: 2px;
}

/* 算式 */
.mc-q {
  font-family: var(--font-math);
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -0.5px;
  line-height: 1.2;
}

/* 参考答案 */
.mc-ans {
  font-size: 12px;
  font-weight: 600;
  color: #64748b;
  margin-top: 1px;
  opacity: 0.85;
}

/* 状态角标 */
.mc-badge {
  position: absolute;
  top: 3px;
  right: 4px;
  font-size: 10px;
  font-weight: 800;
  color: #10b981;
}

/* 标错状态 (点击后) */
.matrix-cell.bad {
  background: var(--danger-bg);
  border-color: var(--danger-border);
  box-shadow: 0 0 0 2px rgba(239, 68, 68, 0.2);
}
.matrix-cell.bad .mc-no {
  color: #ef4444;
}
.matrix-cell.bad .mc-q {
  color: #991b1b;
}
.matrix-cell.bad .mc-ans {
  color: #dc2626;
  font-weight: 800;
}
.matrix-cell.bad .mc-badge {
  color: #dc2626;
  font-size: 12px;
}

/* ================= 详细卡片列表视图 (List View) ================= */
.list-container {
  padding: 0 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.list-cell {
  background: var(--card-bg);
  border: 1.5px solid var(--line);
  border-radius: 12px;
  padding: 12px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  transition: all 0.15s ease;
}
.list-cell:active { transform: scale(0.98); }
.lc-left {
  display: flex;
  align-items: center;
  gap: 12px;
}
.lc-no {
  font-size: 15px;
  font-weight: 800;
  color: #64748b;
  width: 28px;
}
.lc-q {
  font-family: var(--font-math);
  font-size: 20px;
  font-weight: 700;
  color: var(--ink);
}
.lc-right {
  display: flex;
  align-items: center;
  gap: 10px;
}
.lc-ans {
  font-size: 15px;
  color: #64748b;
  background: #f1f5f9;
  padding: 3px 8px;
  border-radius: 6px;
  font-weight: 600;
}
.lc-status {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  background: #ecfdf5;
  color: #10b981;
  font-weight: bold;
}
.list-cell.bad {
  background: var(--danger-bg);
  border-color: var(--danger-border);
}
.list-cell.bad .lc-status {
  background: #fee2e2;
  color: #ef4444;
}
.list-cell.bad .lc-q {
  color: #991b1b;
}

/* ================= 悬浮底部操作栏 ================= */
.floating-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 60;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-top: 1px solid var(--line);
  padding: 10px 16px calc(10px + var(--safe-bottom));
  box-shadow: 0 -4px 16px rgba(0,0,0,0.06);
}
.fb-stats {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
  font-size: 13px;
  font-weight: 600;
}
.fb-counts {
  display: flex;
  gap: 10px;
}
.cnt-right { color: #166534; }
.cnt-wrong { color: #dc2626; font-weight: 800; }
.fb-score {
  font-size: 15px;
  font-weight: 800;
  color: var(--primary);
}

.fb-actions {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 10px;
}
.btn-reset {
  border: 1px solid var(--line);
  background: #f8fafc;
  color: #475569;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
  padding: 12px 0;
  cursor: pointer;
}
.btn-submit {
  border: none;
  background: linear-gradient(135deg, #2563eb, #1d4ed8);
  color: #ffffff;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 800;
  padding: 12px 0;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.35);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}
.btn-submit:active { transform: translateY(1px); filter: brightness(0.95); }

/* ================= 底部主导航标签 ================= */
.tab-bar {
  display: none; /* 由统一切换栏管理 */
}

/* ================= 结算弹窗 ================= */
.modal-mask {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  z-index: 100;
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(4px);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.modal-card {
  background: #ffffff;
  border-radius: 20px;
  width: 100%;
  max-width: 360px;
  padding: 24px 20px 20px;
  text-align: center;
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.2);
  animation: popIn 0.25s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}
@keyframes popIn {
  from { opacity: 0; transform: scale(0.9); }
  to { opacity: 1; transform: scale(1); }
}
.modal-stars {
  font-size: 40px;
  margin-bottom: 6px;
  animation: starPulse 1s infinite alternate;
}
@keyframes starPulse {
  from { transform: scale(1); }
  to { transform: scale(1.08); }
}
.modal-title {
  font-size: 19px;
  font-weight: 800;
  color: #0f172a;
  margin: 0 0 8px;
}
.modal-desc {
  font-size: 14px;
  color: #475569;
  line-height: 1.5;
  margin: 0 0 16px;
}

.time-picker-section {
  background: #f8fafc;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px;
  margin-bottom: 16px;
  text-align: left;
}
.tps-label {
  font-size: 12px;
  font-weight: 700;
  color: #64748b;
  margin-bottom: 8px;
}
.time-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.time-pill {
  flex: 1;
  min-width: 44px;
  border: 1px solid var(--line);
  background: #ffffff;
  border-radius: 8px;
  padding: 6px 0;
  text-align: center;
  font-size: 13px;
  font-weight: 700;
  color: #334155;
  cursor: pointer;
}
.time-pill.active {
  background: #2563eb;
  border-color: #2563eb;
  color: #fff;
}

.modal-btns {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.btn-primary-block {
  background: #2563eb;
  color: #fff;
  border: none;
  border-radius: 10px;
  padding: 12px;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
}
.btn-secondary-block {
  background: transparent;
  color: #64748b;
  border: none;
  padding: 8px;
  font-size: 13px;
  cursor: pointer;
}

/* ================= 错题本与学情足迹 Tab 面板 ================= */
.tab-content {
  display: none;
}
.tab-content.active {
  display: block;
}

.pane-wrapper {
  padding: 16px;
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin-bottom: 16px;
}
.stat-box {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px;
  text-align: center;
}
.stat-val {
  font-size: 22px;
  font-weight: 900;
  color: #0f172a;
  line-height: 1.1;
}
.stat-lbl {
  font-size: 12px;
  color: #64748b;
  margin-top: 4px;
}

.section-card {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 16px;
  margin-bottom: 14px;
}
.section-card h3 {
  margin: 0 0 12px;
  font-size: 15px;
  font-weight: 800;
  color: #1e293b;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* 进度条 */
.pbar-wrap {
  margin-bottom: 10px;
}
.pbar-info {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 4px;
}
.pbar-track {
  height: 8px;
  background: #e2e8f0;
  border-radius: 4px;
  overflow: hidden;
}
.pbar-fill {
  height: 100%;
  background: linear-gradient(90deg, #3b82f6, #10b981);
  border-radius: 4px;
  transition: width 0.3s ease;
}

/* 错题卡片 */
.error-card {
  background: #ffffff;
  border: 1px solid var(--line);
  border-left: 4px solid #ef4444;
  border-radius: 10px;
  padding: 12px 14px;
  margin-bottom: 10px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.ec-left {
  display: flex;
  flex-direction: column;
  gap: 3px;
}
.ec-q {
  font-family: var(--font-math);
  font-size: 17px;
  font-weight: 800;
  color: #991b1b;
}
.ec-info {
  font-size: 12px;
  color: #64748b;
}
.btn-mastered {
  border: 1px solid #10b981;
  background: #f0fdf4;
  color: #166534;
  font-size: 12px;
  font-weight: 700;
  padding: 6px 10px;
  border-radius: 8px;
  cursor: pointer;
}

.empty-state {
  text-align: center;
  padding: 40px 20px;
  color: #64748b;
  font-size: 14px;
}
.empty-state .icon {
  font-size: 40px;
  margin-bottom: 8px;
}

/* 底部标签导航 */
.main-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 70;
  background: rgba(255, 255, 255, 0.98);
  border-top: 1px solid var(--line);
  display: flex;
  padding: 6px 0 calc(6px + var(--safe-bottom));
}
.nav-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: #64748b;
  font-size: 11px;
  font-weight: 600;
  border: none;
  background: transparent;
  cursor: pointer;
  padding: 4px 0;
}
.nav-item.active {
  color: #2563eb;
}
.nav-icon {
  font-size: 20px;
  margin-bottom: 2px;
}