* { margin: 0; padding: 0; box-sizing: border-box; }
:root {
  --primary: #1677ff;
  --primary-hover: #4096ff;
  --bg: #f0f2f5;
  --card-bg: #fff;
  --border: #e8e8e8;
  --text: #1f1f1f;
  --text-secondary: #666;
  --text-muted: #999;
  --danger: #ff4d4f;
  --success: #52c41a;
  --radius: 8px;
  --shadow: 0 2px 8px rgba(0,0,0,0.06);
}
body { font-family: -apple-system, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif; background: var(--bg); color: var(--text); min-height: 100vh; }
input, select, textarea, button { font-family: inherit; font-size: inherit; }
a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-hover); }

/* ── Auth Pages ── */
.auth-page {
  display: flex; align-items: center; justify-content: center;
  min-height: 100vh; padding: 24px;
}
.auth-card {
  background: var(--card-bg); border-radius: 12px;
  box-shadow: var(--shadow); padding: 40px;
  width: 100%; max-width: 400px;
}
.auth-card h1 { font-size: 24px; margin-bottom: 8px; text-align: center; }
.auth-card .subtitle { text-align: center; color: var(--text-muted); margin-bottom: 28px; font-size: 14px; }
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 6px; color: var(--text-secondary); }
.form-group input, .form-group select, .form-group textarea {
  width: 100%; padding: 10px 12px;
  border: 1px solid var(--border); border-radius: var(--radius);
  font-size: 14px; outline: none; transition: border-color 0.2s;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { border-color: var(--primary); }
.form-hint { font-size: 12px; color: var(--text-muted); margin-top: 4px; }
.form-error { font-size: 12px; color: var(--danger); margin-top: 4px; display: none; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 10px 20px; border: none; border-radius: var(--radius);
  font-size: 14px; font-weight: 500; cursor: pointer;
  transition: all 0.2s;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { background: #ff7875; }
.btn-ghost { background: transparent; color: var(--text-secondary); border: 1px solid var(--border); }
.btn-ghost:hover { color: var(--primary); border-color: var(--primary); }
.btn-block { width: 100%; }
.btn-sm { padding: 6px 12px; font-size: 12px; }
.auth-link { text-align: center; margin-top: 16px; font-size: 13px; color: var(--text-secondary); }
.auth-link a { cursor: pointer; }

/* ── App Layout ── */
.app-page { display: none; min-height: 100vh; }
.app-page.visible { display: flex; flex-direction: column; }
.topbar {
  display: flex; align-items: center; gap: 16px;
  padding: 12px 24px; background: var(--card-bg);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 100;
}
.logo { font-size: 18px; font-weight: 700; color: var(--primary); white-space: nowrap; }
.search-box { flex: 1; position: relative; max-width: 480px; }
.search-box input {
  width: 100%; padding: 8px 12px 8px 36px;
  border: 1px solid var(--border); border-radius: 20px;
  font-size: 13px; background: var(--bg); outline: none;
}
.search-box input:focus { border-color: var(--primary); background: var(--card-bg); }
.search-icon { position: absolute; left: 12px; top: 50%; transform: translateY(-50%); color: var(--text-muted); font-size: 14px; }
.user-info { display: flex; align-items: center; gap: 10px; font-size: 13px; color: var(--text-secondary); }
.user-info .avatar {
  width: 32px; height: 32px; border-radius: 50%;
  background: var(--primary); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-weight: 600; font-size: 13px;
}
.user-info .logout-btn {
  background: none; border: none; color: var(--text-muted);
  cursor: pointer; font-size: 12px; padding: 4px 8px;
}
.user-info .logout-btn:hover { color: var(--danger); }

.main-layout { display: flex; flex: 1; }
.sidebar {
  width: 200px; background: var(--card-bg);
  border-right: 1px solid var(--border);
  padding: 8px 0; flex-shrink: 0;
}
.nav-item {
  display: flex; align-items: center; gap: 10px;
  padding: 12px 24px; cursor: pointer;
  color: var(--text-secondary); font-size: 14px;
  border-right: 3px solid transparent;
  transition: all 0.15s;
}
.nav-item:hover { background: #f5f5f5; color: var(--text); }
.nav-item.active {
  background: #e6f4ff; color: var(--primary); font-weight: 600;
  border-right-color: var(--primary);
}
.nav-item .icon { font-size: 16px; }
.nav-divider { flex: 1; }
.nav-item.settings { margin-top: auto; font-size: 13px; }

.content { flex: 1; padding: 24px; overflow-y: auto; }
.content-header {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 20px;
}
.content-header h2 { font-size: 20px; font-weight: 600; }
.content-header .actions { display: flex; gap: 8px; align-items: center; }

/* ── Module Pages ── */
.module-page { display: none; }
.module-page.active { display: block; }

/* ── Search / Filter Bar ── */
.filter-bar {
  display: flex; gap: 8px; margin-bottom: 16px; flex-wrap: wrap;
}
.filter-bar input {
  flex: 1; min-width: 200px; padding: 8px 12px;
  border: 1px solid var(--border); border-radius: var(--radius);
  font-size: 13px; outline: none;
}
.filter-bar input:focus { border-color: var(--primary); }
.filter-bar select {
  padding: 8px 12px; border: 1px solid var(--border);
  border-radius: var(--radius); font-size: 13px; outline: none; background: var(--card-bg);
}

/* ── Card List ── */
.card-list { display: flex; flex-direction: column; gap: 8px; }
.card {
  display: flex; align-items: center; gap: 14px;
  padding: 14px 16px; border-radius: var(--radius);
  border: 1px solid var(--border); background: var(--card-bg);
  cursor: pointer; transition: box-shadow 0.15s;
}
.card:hover { box-shadow: 0 2px 8px rgba(0,0,0,0.06); }
.card-icon {
  width: 40px; height: 40px; border-radius: var(--radius);
  display: flex; align-items: center; justify-content: center;
  font-size: 18px; flex-shrink: 0;
}
.card-icon.c-blue { background: #e6f4ff; color: var(--primary); }
.card-icon.c-green { background: #f6ffed; color: var(--success); }
.card-icon.c-orange { background: #fff7e6; color: #fa8c16; }
.card-icon.c-purple { background: #f9f0ff; color: #722ed1; }
.card-body { flex: 1; min-width: 0; }
.card-title { font-size: 14px; font-weight: 600; margin-bottom: 2px; }
.card-desc { font-size: 12px; color: var(--text-muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.card-tags { display: flex; gap: 4px; flex-wrap: wrap; margin-top: 4px; }
.card-actions { display: flex; gap: 4px; flex-shrink: 0; }
.card-actions button {
  background: none; border: none; color: var(--text-muted);
  cursor: pointer; padding: 4px 6px; border-radius: 4px; font-size: 13px;
}
.card-actions button:hover { background: #f5f5f5; color: var(--text); }
.card-actions button.danger:hover { color: var(--danger); background: #fff2f0; }

/* ── Image Grid ── */
.image-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 12px;
}
.image-item {
  border-radius: var(--radius); border: 1px solid var(--border);
  overflow: hidden; cursor: pointer; position: relative;
  background: #fafafa; aspect-ratio: 1;
}
.image-item img { width: 100%; height: 100%; object-fit: cover; display: block; }
.image-item .overlay {
  position: absolute; bottom: 0; left: 0; right: 0;
  padding: 8px; background: linear-gradient(transparent, rgba(0,0,0,0.6));
  color: #fff; font-size: 11px; opacity: 0; transition: opacity 0.2s;
}
.image-item:hover .overlay { opacity: 1; }
.image-item .delete-btn {
  position: absolute; top: 6px; right: 6px;
  background: rgba(0,0,0,0.5); color: #fff; border: none;
  border-radius: 50%; width: 24px; height: 24px;
  cursor: pointer; font-size: 12px; opacity: 0; transition: opacity 0.2s;
  display: flex; align-items: center; justify-content: center;
}
.image-item:hover .delete-btn { opacity: 1; }
.image-item .delete-btn:hover { background: var(--danger); }
.image-upload-box {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  border: 2px dashed var(--border); border-radius: var(--radius);
  aspect-ratio: 1; cursor: pointer; color: var(--text-muted);
  font-size: 13px; transition: border-color 0.2s;
}
.image-upload-box:hover { border-color: var(--primary); color: var(--primary); }
.image-upload-box .icon { font-size: 32px; margin-bottom: 4px; }

/* ── Tags ── */
.tag {
  display: inline-block; padding: 2px 8px; border-radius: 4px;
  font-size: 11px; background: #f5f5f5; color: var(--text-secondary);
}
.tag.primary { background: #e6f4ff; color: var(--primary); }

/* ── Modal ── */
.modal-overlay {
  display: none; position: fixed; inset: 0;
  background: rgba(0,0,0,0.45); z-index: 1000;
  align-items: center; justify-content: center;
}
.modal-overlay.open { display: flex; }
.modal {
  background: var(--card-bg); border-radius: 12px;
  padding: 28px; width: 90%; max-width: 480px; max-height: 85vh;
  overflow-y: auto; box-shadow: 0 8px 24px rgba(0,0,0,0.15);
}
.modal h3 { font-size: 18px; margin-bottom: 20px; }
.modal-actions { display: flex; gap: 8px; justify-content: flex-end; margin-top: 20px; }

/* ── Empty State ── */
.empty-state { text-align: center; padding: 60px 20px; color: var(--text-muted); }
.empty-state .icon { font-size: 48px; margin-bottom: 12px; }
.empty-state p { font-size: 14px; }

/* ── Loading ── */
.loading { text-align: center; padding: 40px; color: var(--text-muted); }

/* ── Verify Code Modal ── */
.verify-modal { max-width: 360px; text-align: center; }
.verify-modal p { margin-bottom: 16px; color: var(--text-secondary); font-size: 14px; }

/* ── Toast ── */
.toast {
  position: fixed; top: 24px; right: 24px; z-index: 2000;
  padding: 12px 20px; border-radius: var(--radius);
  background: var(--card-bg); box-shadow: 0 4px 12px rgba(0,0,0,0.15);
  font-size: 14px; transform: translateX(120%); transition: transform 0.3s;
  max-width: 360px;
}
.toast.show { transform: translateX(0); }
.toast.success { border-left: 4px solid var(--success); }
.toast.error { border-left: 4px solid var(--danger); }

/* ── Bottom Tab Bar (Mobile) ── */
.bottom-tabs { display: none; }

/* ── Responsive ── */
@media (max-width: 768px) {
  .sidebar { display: none; }
  .content { padding: 12px; padding-bottom: 72px; }
  .topbar { padding: 10px 12px; }
  .topbar .logo { font-size: 16px; }
  .search-box { max-width: 180px; }
  .user-info .avatar { width: 28px; height: 28px; font-size: 12px; }
  .user-info span:first-child { display: none; }

  .content-header h2 { font-size: 17px; }
  .content-header .actions .btn-sm { padding: 5px 10px; font-size: 12px; }

  .filter-bar input { min-width: 140px; font-size: 13px; padding: 7px 10px; }
  .filter-bar select { font-size: 12px; padding: 7px 10px; }

  .card { padding: 12px 14px; gap: 10px; }
  .card-icon { width: 36px; height: 36px; font-size: 16px; }
  .card-title { font-size: 13px; }
  .card-desc { font-size: 11px; }

  .image-grid { grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); gap: 8px; }
  .image-item .overlay { opacity: 1; font-size: 10px; }
  .image-item .delete-btn { opacity: 1; width: 28px; height: 28px; font-size: 14px; }

  .modal { padding: 20px; width: 95%; max-width: none; max-height: 90vh; }
  .modal h3 { font-size: 16px; }

  .auth-card { padding: 28px 20px; box-shadow: none; }
  .auth-card h1 { font-size: 20px; }

  .toast { top: 12px; right: 12px; left: 12px; max-width: none; font-size: 13px; }

  .empty-state { padding: 40px 16px; }
  .empty-state .icon { font-size: 36px; }

  /* Bottom Tab Bar */
  .bottom-tabs {
    display: flex; position: fixed; bottom: 0; left: 0; right: 0;
    background: var(--card-bg); border-top: 1px solid var(--border);
    z-index: 100; padding: 4px 0; padding-bottom: max(4px, env(safe-area-inset-bottom));
  }
  .bottom-tab {
    flex: 1; display: flex; flex-direction: column; align-items: center;
    gap: 2px; padding: 6px 0; cursor: pointer;
    color: var(--text-muted); font-size: 10px; border: none; background: none;
    transition: color 0.15s;
  }
  .bottom-tab .icon { font-size: 20px; }
  .bottom-tab.active { color: var(--primary); font-weight: 600; }
}