/* === RESET & BASE === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

/* --- Dark theme (default) --- */
:root, [data-theme="dark"] {
  --bg: #0f1117;
  --bg-card: #1a1d27;
  --bg-card-hover: #1f2231;
  --bg-sidebar: #141620;
  --bg-input: #1e2132;
  --border: #2a2d3a;
  --border-light: #353849;
  --text: #e4e6ef;
  --text-muted: #8b8fa3;
  --text-dim: #5c6072;
  --primary: #6366f1;
  --primary-light: #818cf8;
  --primary-bg: rgba(99,102,241,0.12);
  --success: #22c55e;
  --success-bg: rgba(34,197,94,0.12);
  --warning: #f59e0b;
  --warning-bg: rgba(245,158,11,0.12);
  --danger: #ef4444;
  --danger-bg: rgba(239,68,68,0.12);
  --info: #3b82f6;
  --info-bg: rgba(59,130,246,0.12);
  --radius: 12px;
  --radius-sm: 8px;
  --radius-xs: 6px;
  --shadow: 0 4px 24px rgba(0,0,0,0.25);
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.15);
  --transition: 0.2s ease;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  /* delta badge colors (dark) */
  --delta-perfect-bg: rgba(34,197,94,0.15);
  --delta-perfect-fg: #4ade80;
  --delta-good-bg: rgba(34,197,94,0.10);
  --delta-good-fg: #86efac;
  --delta-warn-bg: rgba(245,158,11,0.15);
  --delta-warn-fg: #fbbf24;
  --delta-bad-bg: rgba(239,68,68,0.15);
  --delta-bad-fg: #f87171;
  --retry-bg: rgba(99,102,241,0.25);
  --modal-overlay: rgba(0,0,0,0.6);
}

/* --- Light theme --- */
[data-theme="light"] {
  --bg: #f4f5f7;
  --bg-card: #ffffff;
  --bg-card-hover: #f8f9fb;
  --bg-sidebar: #ffffff;
  --bg-input: #f0f1f4;
  --border: #dfe1e6;
  --border-light: #c9ccd4;
  --text: #1a1d27;
  --text-muted: #5e6278;
  --text-dim: #9ca0af;
  --primary: #4f46e5;
  --primary-light: #4338ca;
  --primary-bg: rgba(79,70,229,0.08);
  --success: #16a34a;
  --success-bg: rgba(22,163,74,0.08);
  --warning: #d97706;
  --warning-bg: rgba(217,119,6,0.08);
  --danger: #dc2626;
  --danger-bg: rgba(220,38,38,0.08);
  --info: #2563eb;
  --info-bg: rgba(37,99,235,0.08);
  --shadow: 0 4px 24px rgba(0,0,0,0.08);
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.05);
  /* delta badge colors (light) */
  --delta-perfect-bg: rgba(22,163,74,0.12);
  --delta-perfect-fg: #15803d;
  --delta-good-bg: rgba(22,163,74,0.08);
  --delta-good-fg: #22863a;
  --delta-warn-bg: rgba(217,119,6,0.10);
  --delta-warn-fg: #b45309;
  --delta-bad-bg: rgba(220,38,38,0.10);
  --delta-bad-fg: #dc2626;
  --retry-bg: rgba(79,70,229,0.12);
  --modal-overlay: rgba(0,0,0,0.3);
}

/* Smooth theme transition on all elements */
body, .sidebar, .topbar, .card, .modal, .toast, .stat-card,
.btn, .search-bar, .form-control, .upload-zone, .paste-area,
.badge, .delta-badge, .motivo-scarto, thead th, tbody td {
  transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

html { font-size: 14px; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow: hidden;
  height: 100vh;
}

#app {
  display: flex;
  height: 100vh;
}

/* === SCROLLBAR === */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--border-light); }

/* === SIDEBAR === */
.sidebar {
  width: 260px;
  min-width: 260px;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  transition: all 0.3s ease;
  z-index: 100;
}

.sidebar.collapsed { width: 68px; min-width: 68px; }
.sidebar.collapsed .sidebar-header span,
.sidebar.collapsed .nav-item span,
.sidebar.collapsed .sidebar-footer { display: none; }
.sidebar.collapsed .nav-item { justify-content: center; padding: 12px; }
.sidebar.collapsed .nav-item i { margin-right: 0; font-size: 1.3rem; }

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

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary-light);
}

.logo i { font-size: 1.5rem; }

.sidebar-toggle, .sidebar-toggle-mobile {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 1.2rem;
  padding: 6px;
  border-radius: var(--radius-xs);
  transition: var(--transition);
}

.sidebar-toggle:hover { color: var(--text); background: var(--bg-card); }

.sidebar-nav {
  flex: 1;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.nav-item {
  display: flex;
  align-items: center;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  text-decoration: none;
  transition: var(--transition);
  font-weight: 500;
  font-size: 0.93rem;
}

.nav-item i { margin-right: 10px; font-size: 1.15rem; }

.nav-item:hover { color: var(--text); background: var(--bg-card); }
.nav-item.active { color: var(--primary-light); background: var(--primary-bg); }

.sidebar-footer {
  padding: 16px 20px;
  border-top: 1px solid var(--border);
}

.version { font-size: 0.75rem; color: var(--text-dim); }

/* === MAIN === */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 0;
}

.topbar {
  padding: 16px 28px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--bg-sidebar);
  min-height: 64px;
}

.topbar h1 {
  font-size: 1.25rem;
  font-weight: 600;
  flex: 1;
}

.sidebar-toggle-mobile { display: none; }

.topbar-actions { display: flex; align-items: center; gap: 12px; }
.datetime { color: var(--text-muted); font-size: 0.85rem; }

.content {
  flex: 1;
  overflow-y: auto;
  padding: 28px;
}

/* === STAT CARDS === */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin-bottom: 28px;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  display: flex;
  align-items: flex-start;
  gap: 16px;
  transition: var(--transition);
}

.stat-card:hover { border-color: var(--border-light); transform: translateY(-1px); }

.stat-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  flex-shrink: 0;
}

.stat-icon.blue { background: var(--info-bg); color: var(--info); }
.stat-icon.green { background: var(--success-bg); color: var(--success); }
.stat-icon.yellow { background: var(--warning-bg); color: var(--warning); }
.stat-icon.purple { background: var(--primary-bg); color: var(--primary-light); }

.stat-info h3 { font-size: 1.5rem; font-weight: 700; line-height: 1.2; }
.stat-info p { color: var(--text-muted); font-size: 0.8rem; margin-top: 2px; }

/* === CARDS & PANELS === */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.card-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.card-header h2 { font-size: 1rem; font-weight: 600; }
.card-body { padding: 20px; }
.card-body.no-padding { padding: 0; }

/* === TABLE === */
.table-wrapper { overflow-x: auto; }

table {
  width: 100%;
  border-collapse: collapse;
}

thead th {
  padding: 10px 16px;
  text-align: left;
  font-weight: 600;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
  background: var(--bg-card);
  position: sticky;
  top: 0;
  z-index: 1;
}

tbody td {
  padding: 10px 16px;
  font-size: 0.88rem;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

tbody tr { transition: var(--transition); }
tbody tr:hover { background: var(--bg-card-hover); }
tbody tr:last-child td { border-bottom: none; }

/* === BUTTONS === */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  color: var(--text);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  font-family: var(--font);
}

.btn:hover { background: var(--bg-card-hover); border-color: var(--border-light); }

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

.btn-success { background: var(--success); border-color: var(--success); color: #fff; }
.btn-success:hover { opacity: 0.9; }

.btn-danger { background: var(--danger); border-color: var(--danger); color: #fff; }
.btn-danger:hover { opacity: 0.9; }

.btn-sm { padding: 5px 10px; font-size: 0.8rem; }
.btn-icon { padding: 6px 8px; }

.btn-group { display: flex; gap: 8px; flex-wrap: wrap; }

/* === BADGES === */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
}

.badge-doc { background: var(--info-bg); color: var(--info); }
.badge-txt { background: var(--success-bg); color: var(--success); }
.badge-ok { background: var(--success-bg); color: var(--success); }
.badge-error { background: var(--danger-bg); color: var(--danger); }
.badge-pending { background: var(--warning-bg); color: var(--warning); }

/* === SEARCH === */
.search-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0 12px;
  transition: var(--transition);
}

.search-bar:focus-within { border-color: var(--primary); }

.search-bar i { color: var(--text-muted); font-size: 1.1rem; }

.search-bar input {
  background: none;
  border: none;
  color: var(--text);
  padding: 9px 0;
  font-size: 0.88rem;
  outline: none;
  width: 200px;
  font-family: var(--font);
}

.search-bar input::placeholder { color: var(--text-dim); }

/* === CHECKBOX === */
.checkbox {
  width: 16px;
  height: 16px;
  accent-color: var(--primary);
  cursor: pointer;
}

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

.form-group label {
  display: block;
  font-weight: 500;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.form-control {
  width: 100%;
  padding: 10px 14px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 0.88rem;
  font-family: var(--font);
  transition: var(--transition);
}

.form-control:focus { outline: none; border-color: var(--primary); }

textarea.form-control { resize: vertical; min-height: 120px; }

.form-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
}

/* === UPLOAD ZONE === */
.upload-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 40px;
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
}

.upload-zone:hover, .upload-zone.dragover {
  border-color: var(--primary);
  background: var(--primary-bg);
}

.upload-zone i { font-size: 2.5rem; color: var(--text-muted); margin-bottom: 12px; }
.upload-zone p { color: var(--text-muted); font-size: 0.9rem; }
.upload-zone .upload-hint { font-size: 0.78rem; color: var(--text-dim); margin-top: 6px; }

/* === MODAL === */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: var(--modal-overlay);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: var(--transition);
}

.modal-overlay.active { opacity: 1; pointer-events: all; }

.modal {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  width: 90vw;
  max-width: 900px;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow);
}

.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: 1rem; font-weight: 600; }

.modal-close {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.3rem;
  cursor: pointer;
  padding: 4px;
  border-radius: var(--radius-xs);
}

.modal-close:hover { color: var(--text); background: var(--bg-input); }

.modal-body {
  padding: 20px;
  overflow-y: auto;
  flex: 1;
}

.modal-body pre {
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-size: 0.8rem;
  line-height: 1.7;
  color: var(--text);
  white-space: pre-wrap;
  word-break: break-word;
}

/* === TOAST === */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toast {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 18px;
  font-size: 0.88rem;
  box-shadow: var(--shadow);
  display: flex;
  align-items: center;
  gap: 10px;
  animation: slideIn 0.3s ease;
  min-width: 280px;
}

.toast.success { border-left: 3px solid var(--success); }
.toast.error { border-left: 3px solid var(--danger); }
.toast.info { border-left: 3px solid var(--info); }

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

/* === TABS === */
.tabs {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 20px;
}

.tab {
  padding: 10px 20px;
  cursor: pointer;
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.88rem;
  border-bottom: 2px solid transparent;
  transition: var(--transition);
  background: none;
  border-top: none;
  border-left: none;
  border-right: none;
  font-family: var(--font);
}

.tab:hover { color: var(--text); }
.tab.active { color: var(--primary-light); border-bottom-color: var(--primary); }

/* === BATCH EDITOR TABLE === */
.editable-table input {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  padding: 6px 10px;
  color: var(--text);
  font-size: 0.85rem;
  width: 100%;
  font-family: var(--font);
}

.editable-table input:focus { outline: none; border-color: var(--primary); }

/* === EMPTY STATE === */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-muted);
}

.empty-state i { font-size: 3rem; color: var(--text-dim); margin-bottom: 16px; display: block; }
.empty-state h3 { font-size: 1.1rem; margin-bottom: 8px; color: var(--text); }
.empty-state p { font-size: 0.88rem; }

/* === PROGRESS BAR === */
.progress-bar {
  width: 100%;
  height: 6px;
  background: var(--bg-input);
  border-radius: 3px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: var(--primary);
  border-radius: 3px;
  transition: width 0.3s ease;
}

/* === MOTIVO SCARTO === */
.motivo-scarto {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-top: 4px;
  font-size: 0.75rem;
  color: var(--warning);
  background: var(--warning-bg);
  padding: 2px 8px;
  border-radius: 4px;
  max-width: 280px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.motivo-scarto i { flex-shrink: 0; }

/* === DELTA BADGES === */
.delta-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 0.82rem;
  font-weight: 700;
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  white-space: nowrap;
}

.delta-perfect {
  background: var(--delta-perfect-bg);
  color: var(--delta-perfect-fg);
}

.delta-good {
  background: var(--delta-good-bg);
  color: var(--delta-good-fg);
}

.delta-warn {
  background: var(--delta-warn-bg);
  color: var(--delta-warn-fg);
}

.delta-bad {
  background: var(--delta-bad-bg);
  color: var(--delta-bad-fg);
}

.retry-tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--retry-bg);
  color: var(--primary-light);
  font-size: 0.65rem;
  font-weight: 700;
  margin-left: 2px;
}

/* === THEME TOGGLE === */
.theme-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 4px;
  cursor: pointer;
  position: relative;
  width: 56px;
  height: 28px;
  flex-shrink: 0;
}

.theme-toggle-track {
  position: absolute;
  inset: 3px;
  border-radius: 20px;
}

.theme-toggle-thumb {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  color: #fff;
  font-size: 0.75rem;
}

[data-theme="light"] .theme-toggle-thumb {
  transform: translateX(28px);
  background: var(--warning);
}

.theme-toggle:hover .theme-toggle-thumb {
  box-shadow: 0 0 0 3px var(--primary-bg);
}

/* Light theme specific adjustments */
[data-theme="light"] .btn-primary { color: #fff; }
[data-theme="light"] .btn-success { color: #fff; }
[data-theme="light"] .btn-danger { color: #fff; }
[data-theme="light"] .sidebar { box-shadow: 1px 0 0 var(--border); }
[data-theme="light"] .topbar { box-shadow: 0 1px 0 var(--border); }
[data-theme="light"] .card { box-shadow: var(--shadow-sm); }
[data-theme="light"] .stat-card { box-shadow: var(--shadow-sm); }
[data-theme="light"] .modal { box-shadow: 0 8px 40px rgba(0,0,0,0.15); }
[data-theme="light"] .toast { box-shadow: 0 4px 16px rgba(0,0,0,0.1); }

[data-theme="light"] .logo { color: var(--primary); }
[data-theme="light"] .nav-item.active { color: var(--primary); }
[data-theme="light"] .tab.active { color: var(--primary); }
[data-theme="light"] .selection-bar span { color: var(--primary); }

/* === RESPONSIVE === */
@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    left: -260px;
    top: 0;
    bottom: 0;
    z-index: 200;
  }
  .sidebar.mobile-open { left: 0; }
  .sidebar-toggle { display: none; }
  .sidebar-toggle-mobile { display: block; }
  .content { padding: 16px; }
  .stats-grid { grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); }
  .search-bar input { width: 140px; }
}

/* === LOADING === */
.spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

.loading-overlay {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 60px;
  gap: 12px;
  color: var(--text-muted);
}

/* === FILE SIZE COLORS === */
.size-text { color: var(--text-muted); font-size: 0.82rem; }

/* === SELECTION BAR === */
.selection-bar {
  background: var(--primary-bg);
  border: 1px solid rgba(99,102,241,0.3);
  border-radius: var(--radius-sm);
  padding: 10px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
  animation: slideIn 0.2s ease;
}

.selection-bar span { font-size: 0.88rem; color: var(--primary-light); font-weight: 500; }

/* === PASTE TABLE === */
.paste-area {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px;
  min-height: 200px;
  color: var(--text);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.82rem;
  white-space: pre;
  overflow: auto;
  outline: none;
  transition: var(--transition);
}

.paste-area:focus { border-color: var(--primary); }
.paste-area:empty::before {
  content: "Incolla qui righe da Excel (tab-separated)...\nCodice Fiscale  ID Debitore  Tipo Sgravio  Canale  Data Presentazione";
  color: var(--text-dim);
}