/* ============ 全局重置 ============ */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary: #c0182d;
  --primary-dark: #9c0f24;
  --primary-light: #fdecee;
  --accent: #e6a23c;
  --text: #2c2c2c;
  --text-soft: #5a5a5a;
  --text-muted: #8a8a8a;
  --bg: #f5f6f8;
  --surface: #ffffff;
  --border: #e5e7eb;
  --border-strong: #d1d5db;
  --success: #16a34a;
  --danger: #dc2626;
  --warning: #f59e0b;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow: 0 4px 12px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 30px rgba(0,0,0,0.12);
  --radius: 10px;
  --radius-sm: 6px;
  --radius-lg: 14px;
}

html, body {
  height: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ============ 顶部导航 ============ */
.topbar {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: #fff;
  padding: 16px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: var(--shadow);
  flex-wrap: wrap;
  gap: 12px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-icon {
  width: 52px;
  height: 52px;
  background: #fff;
  border-radius: 10px;
  display: grid;
  place-items: center;
  box-shadow: 0 2px 6px rgba(0,0,0,0.15);
  overflow: hidden;
  flex-shrink: 0;
}

.brand-logo {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}

.brand-title {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: 0.5px;
}

.brand-subtitle {
  font-size: 12px;
  opacity: 0.85;
  font-weight: 400;
}

.tabs {
  display: flex;
  gap: 8px;
}

.tab {
  background: transparent;
  border: 1px solid rgba(255,255,255,0.4);
  color: #fff;
  padding: 8px 18px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 14px;
  transition: all 0.2s;
}

.tab:hover {
  background: rgba(255,255,255,0.15);
}

.tab.active {
  background: #fff;
  color: var(--primary);
  font-weight: 600;
}

/* ============ 容器 ============ */
.container {
  flex: 1;
  max-width: 1200px;
  width: 100%;
  margin: 24px auto;
  padding: 0 24px;
}

.view {
  display: none;
}

.view.active {
  display: block;
  animation: fadeIn 0.25s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ============ 卡片 ============ */
.card {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  padding: 22px 24px;
  margin-bottom: 20px;
  border: 1px solid var(--border);
}

.card.narrow {
  max-width: 460px;
  margin: 40px auto;
}

.card-header {
  margin-bottom: 18px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border);
}

.card-header h2,
.card-header h3 {
  color: var(--text);
  font-weight: 600;
}

.card-header h2 { font-size: 18px; }
.card-header h3 { font-size: 16px; }

.card-header.collapsible {
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
}

.caret {
  transition: transform 0.2s;
  font-size: 12px;
  color: var(--text-muted);
}

.card-header.collapsible.open .caret {
  transform: rotate(180deg);
}

.muted {
  color: var(--text-muted);
  font-size: 13px;
  margin-top: 4px;
}

.muted.small {
  font-size: 12px;
}

.muted code {
  background: var(--primary-light);
  color: var(--primary-dark);
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 12px;
}

/* ============ 表单 ============ */
.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.field label {
  font-size: 13px;
  color: var(--text-soft);
  font-weight: 500;
}

.field input,
.field select,
.field textarea {
  padding: 9px 12px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  font-size: 14px;
  background: #fff;
  color: var(--text);
  transition: border-color 0.15s, box-shadow 0.15s;
  font-family: inherit;
}

.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(192, 24, 45, 0.12);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr auto;
  gap: 12px;
  align-items: end;
}

.form-stack {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.form-grid .full {
  grid-column: 1 / -1;
}

.form-actions {
  display: flex;
  gap: 10px;
}

/* ============ 按钮 ============ */
.btn {
  padding: 9px 18px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.15s;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  font-family: inherit;
  white-space: nowrap;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
}

.btn-primary:hover:not(:disabled) {
  background: var(--primary-dark);
}

.btn-ghost {
  background: #fff;
  color: var(--text-soft);
  border-color: var(--border-strong);
}

.btn-ghost:hover:not(:disabled) {
  background: var(--bg);
  color: var(--text);
}

.btn-danger {
  background: #fff;
  color: var(--danger);
  border-color: var(--danger);
}

.btn-danger:hover:not(:disabled) {
  background: var(--danger);
  color: #fff;
}

.btn-block {
  width: 100%;
}

.btn-sm {
  padding: 5px 12px;
  font-size: 12px;
}

.link-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 12px;
  cursor: pointer;
  text-decoration: underline;
  padding: 0;
}

.link-btn:hover {
  color: var(--primary);
}

.file-label {
  cursor: pointer;
}

/* ============ 提示 / 错误 ============ */
.alert {
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  margin-top: 12px;
}

.alert-error {
  background: #fef2f2;
  color: var(--danger);
  border: 1px solid #fecaca;
}

.alert-success {
  background: #f0fdf4;
  color: var(--success);
  border: 1px solid #bbf7d0;
}

.alert-info {
  background: #eff6ff;
  color: #1d4ed8;
  border: 1px solid #bfdbfe;
}

/* ============ 学生查询 - 个人卡片 ============ */
.profile-card {
  background: linear-gradient(135deg, #fff 0%, var(--primary-light) 100%);
  border-radius: var(--radius);
  padding: 22px;
  display: flex;
  align-items: center;
  gap: 18px;
  margin-bottom: 18px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.profile-avatar {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  display: grid;
  place-items: center;
  font-size: 24px;
  font-weight: 600;
  flex-shrink: 0;
}

.profile-info { flex: 1; }
.profile-name { font-size: 20px; font-weight: 600; }
.profile-sid { color: var(--text-soft); font-size: 14px; margin-top: 4px; }
.profile-grade {
  display: inline-block;
  margin-top: 6px;
  padding: 2px 10px;
  background: var(--primary-light);
  color: var(--primary-dark);
  border-radius: 999px;
  font-size: 12px;
  font-weight: 500;
}
.profile-grade:empty { display: none; }

.profile-stat {
  text-align: right;
  border-left: 1px solid var(--border);
  padding-left: 24px;
}

.profile-stat .stat-num {
  font-size: 32px;
  font-weight: 700;
  color: var(--primary);
  line-height: 1;
}

.profile-stat .stat-label {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ============ 统计卡片 ============ */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-bottom: 20px;
}

.stat-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 20px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

.stat-card::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 4px;
  background: var(--primary);
}

.stat-card.stat-year::before { background: var(--accent); }
.stat-card.stat-total::before { background: var(--success); }

.stat-card-num {
  font-size: 30px;
  font-weight: 700;
  color: var(--text);
  line-height: 1.1;
}

.stat-card-label {
  font-size: 13px;
  color: var(--text-soft);
  margin-top: 6px;
}

.stat-card-sub {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ============ 记录列表 ============ */
.record-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.record-item {
  display: grid;
  grid-template-columns: 90px 1fr auto auto;
  gap: 12px;
  align-items: center;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: #fafafa;
}

.record-date {
  color: var(--text-muted);
  font-size: 13px;
}

.record-name {
  font-weight: 500;
  font-size: 14px;
}

.record-note {
  color: var(--text-muted);
  font-size: 12px;
  margin-top: 2px;
}

.record-hours {
  background: var(--primary-light);
  color: var(--primary-dark);
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
}

.empty {
  text-align: center;
  color: var(--text-muted);
  padding: 40px 20px;
  font-size: 14px;
}

/* ============ 表格 ============ */
.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

thead {
  background: #fafafa;
}

th {
  text-align: left;
  padding: 12px 14px;
  font-weight: 600;
  color: var(--text-soft);
  font-size: 13px;
  border-bottom: 1px solid var(--border);
}

td {
  padding: 11px 14px;
  border-bottom: 1px solid var(--border);
  color: var(--text);
}

tbody tr:last-child td {
  border-bottom: none;
}

tbody tr:hover {
  background: #fafbfc;
}

.row-actions {
  display: flex;
  gap: 6px;
}

.filter-row {
  display: flex;
  gap: 10px;
  margin-top: 12px;
  flex-wrap: wrap;
}

.filter-row input,
.filter-row select {
  padding: 7px 10px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-family: inherit;
}

.filter-row input { flex: 1; min-width: 180px; }

/* ============ 管理后台布局 ============ */
.admin-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 20px;
  background: transparent;
}

.sidebar {
  background: #fff;
  border-radius: var(--radius);
  padding: 20px 14px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  height: fit-content;
  position: sticky;
  top: 20px;
}

.admin-info {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 6px 16px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 12px;
}

.admin-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 600;
  flex-shrink: 0;
}

.admin-name {
  font-size: 14px;
  font-weight: 600;
}

.menu {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.menu-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 14px;
  color: var(--text-soft);
  transition: background 0.15s;
  user-select: none;
}

.menu-item:hover {
  background: var(--bg);
  color: var(--text);
}

.menu-item.active {
  background: var(--primary-light);
  color: var(--primary-dark);
  font-weight: 600;
}

.menu-icon {
  font-size: 16px;
}

.admin-main {
  background: transparent;
}

.admin-page {
  display: none;
}

.admin-page.active {
  display: block;
  animation: fadeIn 0.2s ease;
}

.admin-page h2 {
  margin-bottom: 16px;
  font-size: 20px;
}

/* ============ 仪表盘 ============ */
.dash-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin-bottom: 20px;
}

.dash-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 20px;
  border: 1px solid var(--border);
  text-align: center;
  box-shadow: var(--shadow-sm);
}

.dash-num {
  font-size: 32px;
  font-weight: 700;
  color: var(--primary);
  line-height: 1;
}

.dash-label {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 8px;
}

.ranking-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.ranking-item {
  display: grid;
  grid-template-columns: 40px 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  background: #fafafa;
}

.ranking-rank {
  font-weight: 700;
  color: var(--text-muted);
  text-align: center;
}

.ranking-item:nth-child(1) .ranking-rank { color: #d4a017; font-size: 18px; }
.ranking-item:nth-child(2) .ranking-rank { color: #9a9a9a; font-size: 16px; }
.ranking-item:nth-child(3) .ranking-rank { color: #b87333; font-size: 16px; }

.ranking-name {
  font-weight: 500;
}

.ranking-sid {
  font-size: 12px;
  color: var(--text-muted);
}

.ranking-hours {
  color: var(--primary);
  font-weight: 600;
}

/* ============ 按年级管理 ============ */
.grade-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 12px;
  margin-top: 12px;
}

.grade-card {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px;
  background: #fafafa;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.grade-card.empty {
  color: var(--text-muted);
  text-align: center;
  padding: 20px;
}

.grade-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--primary-dark);
}

.grade-meta {
  font-size: 12px;
  color: var(--text-muted);
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.grade-meta b {
  color: var(--text);
  font-weight: 600;
}

/* ============ 按活动删除 ============ */
.activity-row {
  display: flex;
  gap: 10px;
  margin-top: 12px;
  align-items: center;
  flex-wrap: wrap;
}

.activity-row select {
  padding: 9px 12px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-family: inherit;
  background: #fff;
}

/* ============ 数据管理 ============ */
.action-row {
  display: flex;
  gap: 10px;
  margin-top: 12px;
  flex-wrap: wrap;
}

.import-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-top: 12px;
}

.import-block {
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 14px;
  background: #fafafa;
}

.import-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 6px;
}

.import-hint {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 10px;
  line-height: 1.6;
}

.import-hint code {
  background: var(--primary-light);
  color: var(--primary-dark);
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 11px;
  margin: 0 2px;
}

.import-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.import-summary {
  display: flex;
  gap: 18px;
  padding: 12px 14px;
  background: #fafafa;
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
}

.import-summary div {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.import-summary b {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 500;
}

.import-summary span {
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
  line-height: 1.2;
}

.import-summary div.ok span { color: var(--success); }
.import-summary div.err span { color: var(--danger); }

.row-error {
  background: #fef2f2 !important;
}

.row-error td {
  color: var(--danger);
}

.badge-ok {
  color: var(--success);
  font-weight: 700;
}

.badge-err {
  background: var(--danger);
  color: #fff;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 600;
  cursor: help;
}

#import-modal-body {
  padding: 16px 20px;
}

/* ============ 弹窗 ============ */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  display: grid;
  place-items: center;
  z-index: 1000;
  animation: fadeIn 0.15s ease;
}

.modal-content {
  background: #fff;
  border-radius: var(--radius);
  min-width: 360px;
  max-width: 480px;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.modal-content.modal-large {
  min-width: 720px;
  max-width: 960px;
  width: 90vw;
  max-height: 88vh;
  display: flex;
  flex-direction: column;
}

.modal-content.modal-large .modal-body {
  overflow-y: auto;
  flex: 1;
}

.import-table-wrap {
  max-height: 50vh;
  overflow: auto;
}

.modal-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-header h3 {
  font-size: 16px;
}

.modal-close {
  background: transparent;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: var(--text-muted);
  line-height: 1;
}

.modal-body {
  padding: 20px;
  font-size: 14px;
  color: var(--text-soft);
}

.modal-footer {
  padding: 12px 20px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  background: #fafafa;
}

/* ============ 页脚 ============ */
.footer {
  text-align: center;
  padding: 16px;
  color: var(--text-muted);
  font-size: 12px;
  border-top: 1px solid var(--border);
  background: var(--surface);
}

/* ============ 工具类 ============ */
.hidden { display: none !important; }

/* ============ 响应式 ============ */
@media (max-width: 900px) {
  .topbar { padding: 14px 16px; }
  .brand-title { font-size: 16px; }
  .container { padding: 0 16px; margin: 16px auto; }

  .form-row { grid-template-columns: 1fr; }
  .form-grid { grid-template-columns: 1fr; }
  .stat-grid { grid-template-columns: 1fr; }
  .dash-grid { grid-template-columns: repeat(2, 1fr); }
  .import-grid { grid-template-columns: 1fr; }

  .admin-layout { grid-template-columns: 1fr; }
  .sidebar { position: static; }

  .modal-content.modal-large {
    min-width: 0;
    width: 95vw;
    max-height: 92vh;
  }

  .profile-card {
    flex-direction: column;
    text-align: center;
  }
  .profile-stat {
    border-left: none;
    border-top: 1px solid var(--border);
    padding-left: 0;
    padding-top: 16px;
    width: 100%;
    text-align: center;
  }

  .record-item {
    grid-template-columns: 1fr auto;
    grid-template-areas:
      "name hours"
      "date   date"
      "note   note";
  }
  .record-date { grid-area: date; }
  .record-info { grid-area: name; }
  .record-hours-tag { grid-area: hours; }
  .record-note { grid-area: note; }

  .menu {
    flex-direction: row;
    overflow-x: auto;
  }
  .menu-item { flex-shrink: 0; }
}

@media (max-width: 600px) {
  .dash-grid { grid-template-columns: 1fr 1fr; }
  .brand-subtitle { display: none; }
  .tabs .tab { padding: 6px 12px; font-size: 13px; }
}