:root {
  --bg: #f4f5f7;
  --surface: #ffffff;
  --border: #e2e4e9;
  --text: #1c1f26;
  --text-muted: #6b7280;
  --primary: #2f6fed;
  --primary-dark: #1f52c4;
  --primary-light: #eef3ff;
  --success: #1a9c5a;
  --success-bg: #e7f7ee;
  --warn: #b8860b;
  --warn-bg: #fdf4e0;
  --danger: #d1453b;
  --danger-bg: #fdeceb;
  --radius: 10px;
  font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }

:root[data-theme="dark"] {
  --bg: #14161d;
  --surface: #1c1f28;
  --border: #2c2f3a;
  --text: #e8e9ed;
  --text-muted: #9096a3;
  --primary-light: #1f2a47;
  --success-bg: #12301f;
  --warn-bg: #3a2e0d;
  --danger-bg: #3a1a17;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  transition: background 0.2s ease, color 0.2s ease;
}

.hidden { display: none !important; }

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes popIn {
  from { opacity: 0; transform: scale(0.96) translateY(4px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}
@keyframes spin {
  to { transform: rotate(360deg); }
}
.fade-in { animation: fadeInUp 0.28s ease; }

/* Login */
.login-screen {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(circle at 20% 20%, #eef3ff 0%, var(--bg) 55%);
}
.login-box {
  background: var(--surface);
  padding: 40px;
  border-radius: 16px;
  border: 1px solid var(--border);
  text-align: center;
  width: 340px;
  box-shadow: 0 20px 50px rgba(20, 30, 70, 0.1);
  animation: popIn 0.35s ease;
}
.login-box img.login-logo { max-width: 160px; max-height: 60px; margin-bottom: 14px; }
.login-box h1 { margin: 0 0 4px; font-size: 22px; }
.login-box p { color: var(--text-muted); margin: 0 0 20px; }
.login-box input {
  width: 100%;
  padding: 14px;
  font-size: 18px;
  text-align: center;
  letter-spacing: 2px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
.login-box input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}
.login-box button {
  width: 100%;
  padding: 12px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}
.login-box button:hover { transform: translateY(-1px); box-shadow: 0 8px 20px rgba(47, 111, 237, 0.35); }
.login-box button:active { transform: translateY(0); }
.error-text { color: var(--danger); font-size: 13px; min-height: 18px; margin-top: 10px; }

/* Shell */
.app-shell {
  display: grid;
  grid-template-columns: 230px 1fr;
  min-height: 100vh;
}
.sidebar {
  background: var(--surface);
  border-right: 1px solid var(--border);
  padding: 24px 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.brand {
  font-weight: 700;
  font-size: 15px;
  margin-bottom: 20px;
  padding: 0 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.brand img.sidebar-logo { max-width: 100%; max-height: 34px; object-fit: contain; }
.sidebar a {
  display: block;
  padding: 10px 12px;
  border-radius: var(--radius);
  color: var(--text);
  text-decoration: none;
  font-size: 14px;
  transition: background 0.15s ease, color 0.15s ease, transform 0.1s ease;
}
.sidebar a:hover { background: var(--bg); transform: translateX(2px); }
.sidebar a.active { background: var(--primary); color: #fff; box-shadow: 0 4px 12px rgba(47, 111, 237, 0.3); }
.logout-btn {
  margin-top: auto;
  padding: 10px 12px;
  border: 1px solid var(--border);
  background: transparent;
  border-radius: var(--radius);
  cursor: pointer;
  color: var(--text-muted);
  font-size: 13px;
  transition: background 0.15s ease;
}
.logout-btn:hover { background: var(--bg); }

.main-content { padding: 32px 40px; max-width: 1100px; }

h2.page-title { margin: 0 0 24px; font-size: 24px; }

/* Cards / grid */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
  margin-bottom: 28px;
}
.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.stat-card:hover { transform: translateY(-2px); box-shadow: 0 10px 24px rgba(20, 30, 70, 0.08); }
.stat-card .label { font-size: 12px; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.04em; }
.stat-card .value { font-size: 26px; font-weight: 700; margin-top: 6px; }
.stat-card .value.positive { color: var(--success); }
.stat-card .value.negative { color: var(--danger); }

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin-bottom: 24px;
  transition: box-shadow 0.15s ease;
}
.panel h3 { margin-top: 0; font-size: 15px; }

table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { text-align: left; padding: 10px 8px; border-bottom: 1px solid var(--border); }
th { color: var(--text-muted); font-weight: 600; font-size: 12px; text-transform: uppercase; }
tr { transition: background 0.12s ease; }
tbody tr:hover { background: var(--bg); }
tr:last-child td { border-bottom: none; }
td.num, th.num { text-align: right; }

.badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
}
.badge.offen { background: var(--warn-bg); color: var(--warn); }
.badge.bezahlt { background: var(--success-bg); color: var(--success); }
.badge.überfällig { background: var(--danger-bg); color: var(--danger); }
.badge.storniert { background: #eee; color: #888; }

.btn {
  padding: 9px 16px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
  transition: transform 0.1s ease, box-shadow 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}
.btn:hover { background: var(--bg); transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn-primary { background: linear-gradient(135deg, var(--primary), var(--primary-dark)); color: #fff; border-color: var(--primary); }
.btn-primary:hover { box-shadow: 0 8px 18px rgba(47, 111, 237, 0.32); }
.btn-primary:disabled { opacity: 0.7; cursor: default; transform: none; box-shadow: none; }
.btn-danger { color: var(--danger); }
.btn-danger:hover { background: var(--danger-bg); border-color: var(--danger); }
.btn-danger-solid { background: var(--danger); color: #fff; border-color: var(--danger); }
.btn-danger-solid:hover { background: #b8382f; }
.btn-sm { padding: 5px 10px; font-size: 12px; }

.action-buttons { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }

.spinner {
  display: inline-block;
  width: 13px; height: 13px;
  border: 2px solid rgba(255,255,255,0.5);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  vertical-align: middle;
  margin-right: 6px;
}

.toolbar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; gap: 12px; flex-wrap: wrap; }

.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.form-grid.full { grid-template-columns: 1fr; }
.field { display: flex; flex-direction: column; gap: 5px; }
.field label { font-size: 12px; color: var(--text-muted); font-weight: 600; }
.field input, .field select, .field textarea {
  padding: 9px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  font-family: inherit;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}
.field textarea { resize: vertical; }

.modal-overlay {
  position: fixed; inset: 0;
  background: rgba(20, 24, 38, 0.45);
  display: flex; align-items: flex-start; justify-content: center;
  padding: 40px 20px;
  overflow-y: auto;
  z-index: 100;
  animation: fadeInUp 0.15s ease;
}
.modal {
  background: var(--surface);
  border-radius: 14px;
  padding: 28px 32px;
  width: 100%;
  max-width: 640px;
  box-shadow: 0 24px 60px rgba(10, 15, 40, 0.25);
  animation: popIn 0.2s ease;
}
.modal.modal-wide { max-width: 980px; }
.modal h3 { margin-top: 0; }
.modal-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 20px; }

.line-items { margin: 16px 0; }
.line-item-row {
  display: grid;
  grid-template-columns: 1fr 70px 90px 100px 30px;
  gap: 8px;
  margin-bottom: 8px;
  align-items: center;
}
.line-item-row input { padding: 8px; border: 1px solid var(--border); border-radius: 6px; font-size: 13px; }
.remove-item { background: none; border: none; color: var(--danger); cursor: pointer; font-size: 16px; }
.totals-row { text-align: right; font-weight: 700; margin-top: 10px; font-size: 16px; }

/* Rechnung: Editor + Live-Vorschau */
.invoice-editor { display: grid; grid-template-columns: 1.1fr 1fr; gap: 28px; align-items: start; }
.buyer-toggle { display: flex; gap: 8px; margin-bottom: 14px; }
.toggle-btn {
  flex: 1;
  padding: 9px 12px;
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  transition: all 0.15s ease;
}
.toggle-btn.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.toggle-btn:disabled { opacity: 0.4; cursor: not-allowed; }

.invoice-preview-col { position: sticky; top: 0; }
.invoice-preview {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 24px;
  font-size: 12px;
  box-shadow: 0 10px 30px rgba(20, 30, 70, 0.08);
  min-height: 400px;
}
.prev-header { display: flex; justify-content: space-between; align-items: flex-start; border-bottom: 3px solid var(--primary); padding-bottom: 12px; margin-bottom: 14px; }
.prev-logo { max-width: 110px; max-height: 34px; object-fit: contain; display: block; margin-bottom: 8px; }
.prev-seller-name { font-weight: 700; font-size: 13px; }
.prev-muted { color: #999; font-size: 10.5px; }
.prev-title { font-size: 20px; font-weight: 800; color: var(--primary); letter-spacing: 1px; }
.prev-meta { display: flex; gap: 18px; font-size: 11px; margin-bottom: 16px; }
.prev-buyer { background: #f8f9fb; border-radius: 8px; padding: 10px 12px; margin-bottom: 16px; font-size: 11.5px; }
.prev-table { width: 100%; border-collapse: collapse; font-size: 11px; margin-bottom: 10px; }
.prev-table th { text-align: left; color: #999; font-size: 9.5px; text-transform: uppercase; border-bottom: 1px solid var(--border); padding: 6px 4px; }
.prev-table td { padding: 6px 4px; border-bottom: 1px solid #f0f0f0; }
.prev-table .num { text-align: right; }
.prev-total { background: var(--primary); color: #fff; border-radius: 8px; padding: 10px 14px; display: flex; justify-content: space-between; font-weight: 700; font-size: 13px; }

.upload-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 30px;
  text-align: center;
  color: var(--text-muted);
  cursor: pointer;
  margin-bottom: 24px;
  transition: border-color 0.15s ease, background 0.15s ease, transform 0.1s ease;
}
.upload-zone:hover { border-color: var(--primary); color: var(--primary); transform: translateY(-1px); }
.upload-zone.dragover { border-color: var(--primary); background: var(--primary-light); }

.expense-card {
  display: grid;
  grid-template-columns: 90px 1fr auto;
  gap: 16px;
  align-items: center;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.expense-card:hover { transform: translateY(-2px); box-shadow: 0 10px 24px rgba(20, 30, 70, 0.08); }
.expense-thumb {
  width: 90px; height: 90px;
  object-fit: cover;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
}
.pill { font-size: 11px; padding: 2px 8px; border-radius: 999px; background: var(--bg); color: var(--text-muted); }
.pill.ai { background: var(--primary-light); color: var(--primary); }
.pill.review { background: var(--warn-bg); color: var(--warn); }
.ai-error-note { background: var(--danger-bg); color: var(--danger); font-size: 12px; padding: 6px 10px; border-radius: 6px; margin-top: 6px; }

.toast {
  position: fixed; bottom: 24px; right: 24px;
  background: #1c1f26; color: #fff;
  padding: 12px 18px; border-radius: 8px;
  font-size: 14px;
  z-index: 200;
  max-width: 360px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.25);
  animation: fadeInUp 0.2s ease;
}
.toast.error { background: var(--danger); }

.chart-svg { width: 100%; height: auto; }
.chart-legend { display: flex; gap: 18px; font-size: 12px; color: var(--text-muted); margin-top: 6px; }
.chart-legend span { display: flex; align-items: center; gap: 6px; }
.chart-legend i { display: inline-block; width: 10px; height: 10px; border-radius: 3px; }

.privacy-text { font-size: 13.5px; line-height: 1.6; color: var(--text); }
.privacy-text h4 { margin-bottom: 4px; }
.empty-state { color: var(--text-muted); padding: 30px; text-align: center; }

@media (max-width: 900px) {
  .invoice-editor { grid-template-columns: 1fr; }
  .invoice-preview-col { position: static; }
}