/* Base Reset & Variables */
:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #dbeafe;
  --danger: #dc2626;
  --danger-light: #fee2e2;
  --success: #16a34a;
  --success-light: #dcfce7;
  --warning: #f59e0b;
  --text: #1f2937;
  --text-secondary: #6b7280;
  --border: #e5e7eb;
  --bg: #f3f4f6;
  --white: #ffffff;
  --sidebar-bg: #111827;
  --sidebar-text: #d1d5db;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

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

html, body {
  height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 14px;
  color: var(--text);
  background: var(--bg);
  line-height: 1.5;
}

a {
  color: var(--primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 16px;
  border: none;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.2s, box-shadow 0.2s;
  white-space: nowrap;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
  background: var(--primary-dark);
  text-decoration: none;
}

.btn-danger {
  background: var(--danger-light);
  color: var(--danger);
}

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

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border);
}

.btn-ghost:hover:not(:disabled) {
  background: var(--bg);
  text-decoration: none;
}

.btn-block {
  width: 100%;
}

.btn-sm {
  padding: 4px 10px;
  font-size: 12px;
}

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

.form-group label {
  display: block;
  margin-bottom: 6px;
  font-weight: 500;
  color: var(--text);
}

.form-group input[type="text"],
.form-group input[type="password"] {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 14px;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.file-upload {
  position: relative;
}

.file-upload input[type="file"] {
  position: absolute;
  opacity: 0;
  width: 100%;
  height: 100%;
  cursor: pointer;
}

.file-upload-label {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 24px 16px;
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  color: var(--text-secondary);
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
}

.file-upload-label:hover {
  border-color: var(--primary);
  background: var(--primary-light);
}

.file-upload .file-icon {
  font-size: 24px;
}

.selected-files {
  margin-top: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.selected-file-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 8px 12px;
  background: var(--bg);
  border-radius: var(--radius);
  font-size: 13px;
}

.selected-file-name {
  color: var(--text);
  word-break: break-all;
}

.selected-file-size {
  color: var(--text-secondary);
  white-space: nowrap;
  flex-shrink: 0;
}

.form-actions {
  display: flex;
  gap: 12px;
  margin-top: 24px;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  font-weight: normal;
  color: var(--text-secondary);
}

.checkbox-label input {
  width: 16px;
  height: 16px;
  accent-color: var(--primary);
}

.error-message,
.field-error,
.result-message {
  margin-top: 10px;
  padding: 10px 12px;
  border-radius: var(--radius);
  font-size: 13px;
  display: none;
}

.error-message {
  background: var(--danger-light);
  color: var(--danger);
}

.result-message.success {
  background: var(--success-light);
  color: var(--success);
}

.result-message.error {
  background: var(--danger-light);
  color: var(--danger);
}

.result-message.show,
.error-message.show,
.field-error.show {
  display: block;
}

/* Login Page */
.login-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
}

.login-box {
  width: 100%;
  max-width: 400px;
  padding: 40px 32px;
  background: var(--white);
  border-radius: 16px;
  box-shadow: var(--shadow-lg);
}

.login-header {
  text-align: center;
  margin-bottom: 32px;
}

.login-header h1 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 6px;
}

.login-header p {
  color: var(--text-secondary);
  font-size: 13px;
}

.remember-row {
  display: flex;
  align-items: center;
}

/* Dashboard Layout */
.app-layout {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: 240px;
  background: var(--sidebar-bg);
  color: var(--sidebar-text);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  transition: transform 0.3s ease;
}

.sidebar-brand {
  padding: 24px 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.sidebar-brand h2 {
  color: var(--white);
  font-size: 18px;
  margin-bottom: 4px;
}

.sidebar-brand p {
  font-size: 12px;
  opacity: 0.7;
  word-break: break-all;
}

.sidebar-nav {
  flex: 1;
  padding: 16px 12px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  margin-bottom: 4px;
  color: var(--sidebar-text);
  border-radius: var(--radius);
  transition: background 0.2s, color 0.2s;
}

.nav-item:hover,
.nav-item.active {
  background: rgba(255, 255, 255, 0.1);
  color: var(--white);
  text-decoration: none;
}

.nav-item .icon {
  font-size: 18px;
  width: 24px;
  text-align: center;
}

.sidebar-footer {
  padding: 16px 12px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.topbar {
  height: 60px;
  background: var(--white);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 24px;
  gap: 16px;
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 22px;
  cursor: pointer;
  color: var(--text);
}

.page-title {
  font-size: 18px;
  font-weight: 600;
}

.content-wrapper {
  flex: 1;
  padding: 24px;
  overflow-y: auto;
}

/* Pages */
.page {
  display: none;
}

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

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.page-header h2 {
  font-size: 18px;
  font-weight: 600;
}

/* Cards */
.card {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
}

.form-card {
  max-width: 720px;
}

.form-card.narrow {
  max-width: 480px;
}

/* Tables */
.table-responsive {
  overflow-x: auto;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.data-table th,
.data-table td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}

.data-table th {
  background: var(--bg);
  font-weight: 600;
  color: var(--text-secondary);
  white-space: nowrap;
}

.data-table tr:hover td {
  background: #f9fafb;
}

.data-table .actions {
  display: flex;
  gap: 8px;
  flex-wrap: nowrap;
}

.data-table .case-id {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-weight: 600;
  color: var(--primary);
}

.data-table .file-names {
  white-space: pre-line;
  line-height: 1.6;
  max-width: 240px;
  word-break: break-all;
}

.empty-row td {
  text-align: center;
  color: var(--text-secondary);
  padding: 40px 16px;
}

/* Modal */
.modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 1000;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal.show {
  display: flex;
}

.modal-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
}

.modal-content {
  position: relative;
  background: var(--white);
  border-radius: 12px;
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 420px;
  overflow: hidden;
  z-index: 1;
}

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

.modal-header h3 {
  font-size: 16px;
  font-weight: 600;
}

.modal-close {
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: var(--text-secondary);
}

.modal-body {
  padding: 24px 20px;
  text-align: center;
}

.modal-body img {
  max-width: 240px;
  height: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin: 16px 0;
}

.qr-case-id {
  color: var(--text-secondary);
  font-size: 13px;
}

.qr-case-id strong {
  color: var(--text);
  font-size: 16px;
}

.qr-tip {
  font-size: 12px;
  color: var(--text-secondary);
}

.modal-footer {
  padding: 12px 20px 20px;
  display: flex;
  justify-content: center;
}

/* Toast */
.toast {
  position: fixed;
  top: 20px;
  right: 20px;
  padding: 12px 18px;
  border-radius: var(--radius);
  color: var(--white);
  font-size: 14px;
  box-shadow: var(--shadow-lg);
  z-index: 1100;
  animation: slideIn 0.3s ease;
}

.toast.success {
  background: var(--success);
}

.toast.error {
  background: var(--danger);
}

@keyframes slideIn {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

/* Responsive */
@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    transform: translateX(-100%);
    z-index: 900;
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .menu-toggle {
    display: block;
  }

  .content-wrapper {
    padding: 16px;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .page-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .data-table {
    min-width: 800px;
  }

  .data-table .actions {
    flex-direction: column;
  }
}