:root {
  --bg: #f1f5f9;
  --surface: #ffffff;
  --surface-subtle: #f8fafc;
  --border: #e2e8f0;
  --border-strong: #cbd5e1;
  --text: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-soft: #eff6ff;
  --success: #059669;
  --success-soft: #ecfdf5;
  --danger: #dc2626;
  --danger-soft: #fef2f2;
  --header-bg: #0f172a;
  --radius: 10px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Microsoft YaHei UI", "PingFang SC", "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.hidden {
  display: none !important;
}

/* Top Navbar */
.topbar {
  background: var(--header-bg);
  color: #f8fafc;
  height: 58px;
  padding: 0 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 40;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.15);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.brand-badge {
  background: var(--primary);
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 6px;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.user-pill {
  font-size: 13px;
  color: #cbd5e1;
  margin-right: 6px;
}

.role-tag {
  display: inline-block;
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 11px;
  margin-left: 5px;
  background: #334155;
  color: #38bdf8;
}

/* Auth View */
.auth-wrap {
  min-height: calc(100vh - 58px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px 16px;
}

.auth-card {
  width: 100%;
  max-width: 410px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 32px 28px;
  box-shadow: 0 10px 25px -5px rgba(15, 23, 42, 0.06);
}

.auth-tabs {
  display: flex;
  background: var(--bg);
  padding: 4px;
  border-radius: 8px;
  margin-bottom: 22px;
}

.auth-tab {
  flex: 1;
  border: none;
  background: transparent;
  padding: 8px 12px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
  border-radius: 6px;
  cursor: pointer;
}

.auth-tab.active {
  background: var(--surface);
  color: var(--primary);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.06);
}

.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.input, select.input, textarea.input {
  width: 100%;
  padding: 9px 12px;
  font-size: 14px;
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  background: #fff;
  color: var(--text);
  outline: none;
  transition: border-color 0.15s;
}

.input:focus {
  border-color: var(--primary);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 15px;
  font-size: 13.5px;
  font-weight: 600;
  border-radius: 8px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.15s;
  text-decoration: none;
  white-space: nowrap;
}

.btn-sm {
  padding: 5px 10px;
  font-size: 12px;
  border-radius: 6px;
}

.btn-block {
  width: 100%;
  padding: 10px 16px;
  font-size: 14.5px;
}

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

.btn-outline {
  background: #fff;
  color: var(--text);
  border-color: var(--border-strong);
}
.btn-outline:hover {
  background: var(--surface-subtle);
}

.btn-ghost-dark {
  background: #1e293b;
  color: #f8fafc;
  border-color: #334155;
}
.btn-ghost-dark:hover {
  background: #334155;
}

.btn-ghost-dark.active-mode {
  background: var(--primary);
  border-color: var(--primary);
}

.btn-danger {
  background: var(--danger-soft);
  color: var(--danger);
  border-color: #fecaca;
}
.btn-danger:hover {
  background: #fee2e2;
}

/* Portal Layout */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 20px;
}

.portal-grid {
  display: grid;
  grid-template-columns: 270px 1fr;
  gap: 18px;
  align-items: start;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
}

.sidebar-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  margin-bottom: 10px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

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

.group-item {
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.12s;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.group-item:hover {
  background: var(--surface-subtle);
}

.group-item.active {
  background: var(--primary-soft);
  border-color: #bfdbfe;
  color: var(--primary-hover);
}

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

.group-item-meta {
  font-size: 12px;
  color: var(--text-muted);
  background: var(--bg);
  padding: 2px 7px;
  border-radius: 999px;
}

.group-item.active .group-item-meta {
  background: #dbeafe;
  color: var(--primary-hover);
}

/* File Area */
.group-header {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 16px;
}

.group-title {
  font-size: 19px;
  font-weight: 700;
}

.group-desc {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 2px;
}

.toolbar-row {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
}

/* Upload Box */
.upload-panel {
  background: var(--surface-subtle);
  border: 2px dashed var(--border-strong);
  border-radius: 10px;
  padding: 18px;
  margin-bottom: 18px;
  transition: border-color 0.15s, background 0.15s;
}

.upload-panel.dragover {
  border-color: var(--primary);
  background: var(--primary-soft);
}

.progress-wrap {
  margin-top: 12px;
}

.progress-bar-bg {
  width: 100%;
  height: 8px;
  background: var(--border);
  border-radius: 99px;
  overflow: hidden;
  margin-top: 5px;
}

.progress-bar-fill {
  height: 100%;
  width: 0%;
  background: var(--primary);
  transition: width 0.15s;
}

/* Tables */
.table-wrap {
  width: 100%;
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13.5px;
}

th {
  text-align: left;
  padding: 10px 12px;
  background: var(--surface-subtle);
  color: var(--text-secondary);
  font-weight: 600;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

td {
  padding: 11px 12px;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}

tr:hover td {
  background: #fcfdff;
}

.file-name-cell {
  font-weight: 600;
  color: var(--text);
  word-break: break-all;
}

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

/* Admin View */
.admin-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.admin-tab {
  padding: 8px 16px;
  border-radius: 8px;
  background: var(--surface);
  border: 1px solid var(--border);
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
}

.admin-tab.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 14px;
  margin-bottom: 18px;
}

.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
}

.stat-label {
  font-size: 12.5px;
  color: var(--text-muted);
}

.stat-val {
  font-size: 24px;
  font-weight: 700;
  margin-top: 4px;
  color: var(--text);
}

/* Group Check Pills */
.group-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.group-pill {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  border: 1px solid var(--border-strong);
  background: #fff;
  color: var(--text-secondary);
  cursor: pointer;
  user-select: none;
  transition: all 0.12s;
}

.group-pill:hover {
  border-color: var(--primary);
}

.group-pill.checked {
  background: var(--primary-soft);
  border-color: #60a5fa;
  color: var(--primary-hover);
}

.badge-green {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 99px;
  font-size: 11.5px;
  font-weight: 600;
  background: var(--success-soft);
  color: var(--success);
}

.badge-red {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 99px;
  font-size: 11.5px;
  font-weight: 600;
  background: var(--danger-soft);
  color: var(--danger);
}

.policy-banner {
  background: #f8fafc;
  border: 1px solid #cbd5e1;
  border-radius: 10px;
  padding: 16px;
  margin-bottom: 18px;
}

.switch-row {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  align-items: center;
  margin-bottom: 12px;
}

.checkbox-label {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 13.5px;
  font-weight: 600;
  cursor: pointer;
}

.empty-state {
  text-align: center;
  padding: 46px 20px;
  color: var(--text-muted);
}

/* Modal */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.45);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  z-index: 90;
}

.modal-card {
  width: 100%;
  max-width: 460px;
  background: #fff;
  border-radius: 12px;
  padding: 22px;
  box-shadow: 0 20px 35px rgba(0, 0, 0, 0.18);
}

.modal-title {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 14px;
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 18px;
}

/* Toast */
.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: #0f172a;
  color: #fff;
  padding: 11px 18px;
  border-radius: 8px;
  font-size: 13.5px;
  font-weight: 500;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
  z-index: 120;
}

@media (max-width: 860px) {
  .portal-grid {
    grid-template-columns: 1fr;
  }
}