:root {
  --bg: #f1f5f9;
  --surface: #ffffff;
  --surface-2: #f8fafc;
  --border: #e2e8f0;
  --text: #0f172a;
  --text-muted: #64748b;
  --primary: #4f46e5;
  --primary-dark: #4338ca;
  --primary-soft: #eef2ff;
  --danger: #dc2626;
  --danger-soft: #fef2f2;
  --success: #059669;
  --warning: #d97706;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06);
  --shadow: 0 4px 16px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 12px 40px rgba(15, 23, 42, 0.16);
  --radius: 14px;
  --radius-sm: 9px;
  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

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

html { -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

button { font-family: inherit; cursor: pointer; border: none; background: none; }
input, select, textarea { font-family: inherit; font-size: 15px; }
a { color: inherit; }

/* ---------- Layout ---------- */
.app-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}
.app-header__inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  gap: 16px;
}
.brand { display: flex; align-items: center; gap: 11px; cursor: pointer; }
.brand__mark {
  width: 38px; height: 38px;
  display: grid; place-items: center;
  background: linear-gradient(135deg, var(--primary), #7c3aed);
  border-radius: 11px;
  font-size: 20px;
  box-shadow: var(--shadow-sm);
}
.brand__title { font-size: 17px; font-weight: 700; letter-spacing: -0.01em; }
.brand__sub { font-size: 12px; color: var(--text-muted); font-weight: 500; }
.app-header__spacer { flex: 1; }

main { max-width: 1120px; margin: 0 auto; padding: 28px 24px 80px; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  font-weight: 600; font-size: 14px;
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  transition: all 0.15s ease;
  white-space: nowrap;
}
.btn:hover { background: var(--surface-2); border-color: #cbd5e1; }
.btn:active { transform: translateY(1px); }
.btn--primary {
  background: var(--primary); color: #fff; border-color: var(--primary);
  box-shadow: 0 2px 8px rgba(79, 70, 229, 0.3);
}
.btn--primary:hover { background: var(--primary-dark); border-color: var(--primary-dark); }
.btn--ghost { background: transparent; border-color: transparent; }
.btn--ghost:hover { background: var(--surface-2); }
.btn--danger { color: var(--danger); border-color: transparent; }
.btn--danger:hover { background: var(--danger-soft); }
.btn--sm { padding: 7px 12px; font-size: 13px; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* ---------- Cards & stats ---------- */
.page-head {
  display: flex; align-items: flex-end; justify-content: space-between;
  gap: 16px; margin-bottom: 22px; flex-wrap: wrap;
}
.page-head h1 { font-size: 26px; font-weight: 800; letter-spacing: -0.02em; }
.page-head p { color: var(--text-muted); font-size: 14px; margin-top: 2px; }

.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 28px;
}
.stat {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  box-shadow: var(--shadow-sm);
}
.stat__label { font-size: 12.5px; color: var(--text-muted); font-weight: 600; text-transform: uppercase; letter-spacing: 0.04em; }
.stat__value { font-size: 25px; font-weight: 800; margin-top: 7px; letter-spacing: -0.02em; }
.stat__hint { font-size: 12.5px; color: var(--text-muted); margin-top: 3px; }

/* ---------- Toolbar ---------- */
.toolbar { display: flex; gap: 10px; align-items: center; margin-bottom: 18px; flex-wrap: wrap; }
.toolbar__filters { display: flex; gap: 6px; background: var(--surface); padding: 4px; border-radius: 11px; border: 1px solid var(--border); }
.chip {
  padding: 7px 14px; border-radius: 8px; font-size: 13.5px; font-weight: 600;
  color: var(--text-muted); transition: all 0.12s ease;
}
.chip--active { background: var(--primary-soft); color: var(--primary); }
.chip:hover:not(.chip--active) { background: var(--surface-2); }
.search { flex: 1; min-width: 180px; position: relative; }
.search input {
  width: 100%; padding: 10px 14px 10px 38px;
  border: 1px solid var(--border); border-radius: var(--radius-sm);
  background: var(--surface); outline: none; transition: border-color 0.15s;
}
.search input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-soft); }
.search::before { content: "🔍"; position: absolute; left: 12px; top: 50%; transform: translateY(-50%); font-size: 14px; opacity: 0.6; }

/* ---------- Trip grid ---------- */
.trip-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 16px; }
.trip-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s;
  cursor: pointer;
  display: flex; flex-direction: column; gap: 14px;
}
.trip-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: #cbd5e1; }
.trip-card__top { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; }
.trip-card__dest { display: flex; align-items: center; gap: 11px; }
.trip-card__flag { font-size: 30px; line-height: 1; }
.trip-card__country { font-weight: 700; font-size: 16px; letter-spacing: -0.01em; }
.trip-card__city { font-size: 13px; color: var(--text-muted); }
.trip-card__purpose { font-size: 14px; color: var(--text); }
.trip-card__meta { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--text-muted); }
.trip-card__foot {
  display: flex; align-items: flex-end; justify-content: space-between;
  border-top: 1px solid var(--border); padding-top: 14px; margin-top: 2px;
}
.trip-card__total-label { font-size: 12px; color: var(--text-muted); }
.trip-card__total { font-size: 21px; font-weight: 800; letter-spacing: -0.02em; }

.badge {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 4px 10px; border-radius: 999px;
  font-size: 12px; font-weight: 700;
}
.badge__dot { width: 7px; height: 7px; border-radius: 50%; background: currentColor; }

.avatar {
  width: 26px; height: 26px; border-radius: 50%;
  background: var(--primary-soft); color: var(--primary);
  display: grid; place-items: center; font-size: 11px; font-weight: 700;
}

/* ---------- Empty state ---------- */
.empty {
  text-align: center; padding: 70px 20px;
  background: var(--surface); border: 1px dashed var(--border); border-radius: var(--radius);
}
.empty__icon { font-size: 46px; margin-bottom: 12px; }
.empty h3 { font-size: 18px; font-weight: 700; }
.empty p { color: var(--text-muted); margin: 6px 0 20px; }

/* ---------- Detail view ---------- */
.detail-back { display: inline-flex; align-items: center; gap: 7px; color: var(--text-muted); font-weight: 600; font-size: 14px; margin-bottom: 16px; }
.detail-back:hover { color: var(--text); }
.detail-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 16px; flex-wrap: wrap; margin-bottom: 22px; }
.detail-title { display: flex; align-items: center; gap: 14px; }
.detail-title__flag { font-size: 42px; }
.detail-title h1 { font-size: 24px; font-weight: 800; letter-spacing: -0.02em; }
.detail-title p { color: var(--text-muted); font-size: 14px; }
.detail-actions { display: flex; gap: 9px; align-items: center; flex-wrap: wrap; }

.detail-grid { display: grid; grid-template-columns: 1.6fr 1fr; gap: 22px; align-items: start; }

.panel {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow-sm); overflow: hidden;
}
.panel__head { padding: 16px 20px; border-bottom: 1px solid var(--border); display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.panel__head h2 { font-size: 15px; font-weight: 700; }
.panel__body { padding: 8px 20px 16px; }

/* expense rows */
.exp-row {
  display: flex; align-items: center; gap: 14px;
  padding: 13px 0; border-bottom: 1px solid var(--border);
}
.exp-row:last-child { border-bottom: none; }
.exp-icon { width: 40px; height: 40px; border-radius: 10px; background: var(--surface-2); display: grid; place-items: center; font-size: 19px; flex-shrink: 0; }
.exp-main { flex: 1; min-width: 0; }
.exp-main__cat { font-weight: 600; font-size: 14.5px; }
.exp-main__desc { font-size: 13px; color: var(--text-muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.exp-amt { text-align: right; }
.exp-amt__orig { font-weight: 700; font-size: 15px; }
.exp-amt__eur { font-size: 12.5px; color: var(--text-muted); }
.exp-row__actions { display: flex; gap: 2px; opacity: 0; transition: opacity 0.12s; }
.exp-row:hover .exp-row__actions { opacity: 1; }
.icon-btn { width: 30px; height: 30px; border-radius: 8px; display: grid; place-items: center; font-size: 14px; color: var(--text-muted); }
.icon-btn:hover { background: var(--surface-2); color: var(--text); }
.icon-btn.icon-btn--danger:hover { background: var(--danger-soft); color: var(--danger); }

/* summary */
.summary-row { display: flex; align-items: center; justify-content: space-between; padding: 9px 0; font-size: 14px; }
.summary-row span:first-child { color: var(--text-muted); }
.summary-row__val { font-weight: 600; font-variant-numeric: tabular-nums; }
.summary-divider { height: 1px; background: var(--border); margin: 6px 0; }
.summary-total { display: flex; align-items: center; justify-content: space-between; padding: 14px 0 4px; }
.summary-total__label { font-weight: 700; font-size: 15px; }
.summary-total__val { font-weight: 800; font-size: 23px; letter-spacing: -0.02em; color: var(--primary); font-variant-numeric: tabular-nums; }
.summary-sub { font-size: 12.5px; color: var(--text-muted); margin-top: 2px; }

.toggle-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 12px 0; }
.toggle-row__text strong { font-size: 14px; }
.toggle-row__text small { display: block; color: var(--text-muted); font-size: 12.5px; }
.switch { position: relative; width: 42px; height: 24px; flex-shrink: 0; }
.switch input { opacity: 0; width: 0; height: 0; }
.switch__slider { position: absolute; inset: 0; background: #cbd5e1; border-radius: 999px; transition: 0.2s; }
.switch__slider::before { content: ""; position: absolute; height: 18px; width: 18px; left: 3px; top: 3px; background: #fff; border-radius: 50%; transition: 0.2s; box-shadow: var(--shadow-sm); }
.switch input:checked + .switch__slider { background: var(--primary); }
.switch input:checked + .switch__slider::before { transform: translateX(18px); }

.info-list { display: grid; grid-template-columns: 1fr 1fr; gap: 4px 16px; }
.info-item { padding: 8px 0; border-bottom: 1px solid var(--border); }
.info-item__label { font-size: 12px; color: var(--text-muted); font-weight: 600; text-transform: uppercase; letter-spacing: 0.03em; }
.info-item__value { font-size: 14.5px; font-weight: 600; margin-top: 2px; }

/* ---------- Modal & forms ---------- */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(15, 23, 42, 0.5);
  backdrop-filter: blur(3px);
  display: flex; align-items: center; justify-content: center;
  padding: 20px; z-index: 50; animation: fade 0.15s ease;
}
@keyframes fade { from { opacity: 0; } to { opacity: 1; } }
.modal {
  background: var(--surface); border-radius: 18px; box-shadow: var(--shadow-lg);
  width: 100%; max-width: 540px; max-height: 90vh; overflow-y: auto;
  animation: pop 0.18s cubic-bezier(0.16, 1, 0.3, 1);
}
@keyframes pop { from { opacity: 0; transform: scale(0.96) translateY(8px); } to { opacity: 1; transform: none; } }
.modal__head { padding: 20px 24px; border-bottom: 1px solid var(--border); display: flex; align-items: center; justify-content: space-between; position: sticky; top: 0; background: var(--surface); z-index: 1; }
.modal__head h2 { font-size: 18px; font-weight: 700; }
.modal__body { padding: 20px 24px; }
.modal__foot { padding: 16px 24px; border-top: 1px solid var(--border); display: flex; justify-content: flex-end; gap: 10px; position: sticky; bottom: 0; background: var(--surface); }

.field { margin-bottom: 16px; }
.field label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 6px; color: var(--text); }
.field input, .field select, .field textarea {
  width: 100%; padding: 10px 12px;
  border: 1px solid var(--border); border-radius: var(--radius-sm);
  background: var(--surface); color: var(--text); outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.field input:focus, .field select:focus, .field textarea:focus {
  border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-soft);
}
.field textarea { resize: vertical; min-height: 70px; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.field-row--3 { grid-template-columns: 1.4fr 1fr; }
.field__hint { font-size: 12px; color: var(--text-muted); margin-top: 5px; }
.field__error { font-size: 12.5px; color: var(--danger); margin-top: 5px; display: none; }
.field--invalid input, .field--invalid select { border-color: var(--danger); }
.field--invalid .field__error { display: block; }

/* category picker */
.cat-picker { display: grid; grid-template-columns: repeat(5, 1fr); gap: 8px; }
.cat-opt {
  display: flex; flex-direction: column; align-items: center; gap: 5px;
  padding: 11px 4px; border: 1px solid var(--border); border-radius: 10px;
  font-size: 11.5px; font-weight: 600; color: var(--text-muted); transition: all 0.12s;
}
.cat-opt span { font-size: 20px; }
.cat-opt--active { border-color: var(--primary); background: var(--primary-soft); color: var(--primary); }

.status-select { display: flex; gap: 8px; }
.status-opt { flex: 1; padding: 9px; border: 1px solid var(--border); border-radius: 9px; font-size: 13px; font-weight: 600; color: var(--text-muted); }
.status-opt--active { background: var(--text); color: #fff; border-color: var(--text); }

/* toast */
.toast {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%);
  background: var(--text); color: #fff; padding: 12px 20px; border-radius: 11px;
  font-size: 14px; font-weight: 600; box-shadow: var(--shadow-lg); z-index: 100;
  animation: toastIn 0.2s ease; display: flex; align-items: center; gap: 9px;
}
@keyframes toastIn { from { opacity: 0; transform: translate(-50%, 10px); } to { opacity: 1; transform: translate(-50%, 0); } }

/* ---------- Responsive ---------- */
@media (max-width: 880px) {
  .stats { grid-template-columns: repeat(2, 1fr); }
  .detail-grid { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  main { padding: 20px 16px 60px; }
  .app-header__inner { padding: 12px 16px; }
  .stats { grid-template-columns: 1fr 1fr; gap: 12px; }
  .stat__value { font-size: 21px; }
  .field-row, .field-row--3 { grid-template-columns: 1fr; }
  .cat-picker { grid-template-columns: repeat(3, 1fr); }
  .brand__sub { display: none; }
  .page-head h1 { font-size: 22px; }
}

/* ---------- Print / PDF ---------- */
.print-only { display: none; }
@media print {
  body { background: #fff; font-size: 12px; }
  .app-header, .toolbar, .detail-actions, .detail-back, .panel__head .btn,
  .exp-row__actions, .toggle-row .switch, .no-print,
  .detail-head, .detail-grid { display: none !important; }
  main { max-width: none; padding: 0; }
  .print-only { display: block; }
  .print-report { padding: 0; }
  .print-report__head { display: flex; justify-content: space-between; align-items: flex-start; border-bottom: 2px solid var(--text); padding-bottom: 14px; margin-bottom: 20px; }
  .print-report__title { font-size: 22px; font-weight: 800; }
  .print-report__sub { color: #555; font-size: 12px; margin-top: 4px; }
  .print-brand { text-align: right; font-weight: 700; }
  .print-section { margin-bottom: 22px; }
  .print-section h3 { font-size: 13px; text-transform: uppercase; letter-spacing: 0.05em; border-bottom: 1px solid #ccc; padding-bottom: 5px; margin-bottom: 10px; }
  .print-info-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 6px 24px; }
  .print-info-grid div { font-size: 12px; }
  .print-info-grid b { display: inline-block; min-width: 130px; color: #555; font-weight: 600; }
  table.print-table { width: 100%; border-collapse: collapse; font-size: 11.5px; }
  table.print-table th { text-align: left; border-bottom: 1.5px solid var(--text); padding: 7px 6px; font-size: 10.5px; text-transform: uppercase; letter-spacing: 0.03em; }
  table.print-table td { padding: 7px 6px; border-bottom: 1px solid #e5e5e5; }
  table.print-table td.num, table.print-table th.num { text-align: right; font-variant-numeric: tabular-nums; }
  .print-totals { margin-top: 16px; margin-left: auto; width: 320px; }
  .print-totals .summary-row { padding: 6px 0; }
  .print-total-final { display: flex; justify-content: space-between; border-top: 2px solid var(--text); padding-top: 8px; margin-top: 6px; font-weight: 800; font-size: 15px; }
  .print-sign { margin-top: 50px; display: flex; justify-content: space-between; gap: 40px; }
  .print-sign div { flex: 1; border-top: 1px solid var(--text); padding-top: 6px; font-size: 11px; color: #555; }
  @page { margin: 18mm 16mm; }
}