/* ==========================================================
   D-EERE Cost Tracker — Stylesheet
   Modern CSS: Custom Properties · BEM · Mobile-first
   ========================================================== */

/* --------------------- Theme tokens --------------------- */

:root {
  --color-bg:              #0a0a0a;
  --color-surface:         rgba(255, 255, 255, 0.03);
  --color-surface-elev:    rgba(255, 255, 255, 0.05);
  --color-surface-input:   #171717;
  --color-text:            #e5e5e5;
  --color-text-soft:       #d4d4d4;
  --color-text-muted:      #737373;
  --color-border:          rgba(255, 255, 255, 0.08);
  --color-border-strong:   #404040;
  --color-border-hover:    rgba(245, 158, 11, 0.5);
  --color-accent:          #f59e0b;
  --color-accent-text:     #0a0a0a;
  --color-accent-hover-bg: rgba(245, 158, 11, 0.08);
  --color-icon-secondary:  #a3a3a3;
  --color-danger:          #ef4444;
  --color-danger-bg:       rgba(239, 68, 68, 0.12);

  --radius-sm:  8px;
  --radius-md:  12px;
  --radius-lg:  14px;
  --radius-xl:  16px;
  --space-1:     4px;
  --space-2:     8px;
  --space-3:    12px;
  --space-4:    16px;
  --space-5:    20px;
  --space-6:    24px;

  --font-sans:  -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  --font-mono:  ui-monospace, "SF Mono", "Menlo", monospace;
}

[data-theme="light"] {
  --color-bg:              #fafafa;
  --color-surface:         #ffffff;
  --color-surface-elev:    #ffffff;
  --color-surface-input:   #ffffff;
  --color-text:            #171717;
  --color-text-soft:       #404040;
  --color-text-muted:      #737373;
  --color-border:          rgba(0, 0, 0, 0.08);
  --color-border-strong:   #d4d4d4;
  --color-border-hover:    rgba(180, 83, 9, 0.5);
  --color-accent:          #b45309;
  --color-accent-text:     #ffffff;
  --color-accent-hover-bg: rgba(180, 83, 9, 0.06);
  --color-icon-secondary:  #525252;
  --color-danger:          #dc2626;
  --color-danger-bg:       rgba(220, 38, 38, 0.08);
}

/* --------------------- Reset & base --------------------- */

*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }

body {
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  transition: background 0.2s ease, color 0.2s ease;
}

a { color: inherit; text-decoration: none; }
h1, h2, h3 { margin: 0; }
button { font-family: inherit; cursor: pointer; }

/* --------------------- Layout --------------------- */

.app {
  max-width: 960px;
  margin: 0 auto;
  padding: var(--space-4);
}
@media (min-width: 768px) {
  .app { padding: var(--space-6); }
}

/* --------------------- Header --------------------- */

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-3);
  padding-bottom: var(--space-3);
  margin-bottom: var(--space-5);
  border-bottom: 1px solid var(--color-border);
}

.app-title { font-size: 18px; font-weight: 500; }
.app-title__brand { color: var(--color-accent); font-weight: 500; }
.app-title__sub {
  color: var(--color-text-muted);
  font-size: 14px;
  margin-left: var(--space-1);
  font-weight: 400;
}
@media (min-width: 768px) {
  .app-title { font-size: 20px; }
}

.app-controls {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 13px;
}

.user-badge {
  color: var(--color-text-muted);
  padding: 0 var(--space-2);
  letter-spacing: 0.05em;
}

.page-nav {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: 14px;
  color: var(--color-text-muted);
  padding: var(--space-2) var(--space-2) var(--space-2) 0;
  transition: color 0.15s;
}
.page-nav:hover { color: var(--color-accent); }
.page-nav .ti { font-size: 18px; }

/* --------------------- Page title --------------------- */

.page-title {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: 22px;
  font-weight: 500;
  margin-bottom: var(--space-5);
  letter-spacing: 0.02em;
}
.page-title .ti {
  font-size: 32px;
  color: var(--color-accent);
}

/* --------------------- Icon button --------------------- */

.icon-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  padding: 0;
  border-radius: var(--radius-md);
  background: var(--color-surface);
  border: 1px solid var(--color-border-strong);
  color: var(--color-accent);
  transition: all 0.15s ease;
}
.icon-button:hover,
.icon-button:focus-visible {
  background: var(--color-accent-hover-bg);
  border-color: var(--color-border-hover);
  outline: none;
}
.icon-button .ti { font-size: 22px; line-height: 1; }

.icon-button--subtle {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
}
.icon-button--subtle:hover {
  color: var(--color-accent);
  border-color: var(--color-border-strong);
  background: transparent;
}
.icon-button--subtle .ti { font-size: 18px; }

/* --------------------- Year selector --------------------- */

.year-selector {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-5);
  flex-wrap: wrap;
}
.year-selector__label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-muted);
  font-weight: 500;
}
.year-selector__btns {
  display: flex;
  gap: var(--space-2);
}
.year-btn {
  padding: 8px 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-strong);
  background: var(--color-surface);
  color: var(--color-text);
  font-family: inherit;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
  font-variant-numeric: tabular-nums;
}
.year-btn:hover, .year-btn:focus-visible {
  background: var(--color-accent-hover-bg);
  border-color: var(--color-border-hover);
  outline: none;
}
.year-btn--active {
  background: var(--color-accent);
  color: var(--color-accent-text);
  border-color: var(--color-accent);
}
.year-btn--active:hover {
  filter: brightness(1.05);
}

/* --------------------- KPI cards --------------------- */

.kpi-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3);
  margin-bottom: var(--space-5);
}
@media (min-width: 640px) {
  .kpi-grid { grid-template-columns: repeat(4, 1fr); }
}

.kpi {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-3) 14px;
}
.kpi__label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
}
.kpi__value {
  font-size: 22px;
  font-weight: 500;
  margin-top: var(--space-1);
  font-variant-numeric: tabular-nums;
}

/* --------------------- Sections --------------------- */

.section { margin-bottom: var(--space-5); }
.section__label {
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-muted);
  margin: 0 0 var(--space-2) var(--space-1);
  font-weight: 500;
}
.section__label > span:last-child:not(:only-child) {
  margin-left: auto;
  font-variant-numeric: tabular-nums;
}

/* --------------------- Summary card --------------------- */

.summary-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4) var(--space-5);
  margin-bottom: var(--space-4);
}
.summary-card__head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 6px;
  gap: var(--space-3);
}
.summary-card__label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-muted);
  font-weight: 500;
}
.summary-card__count {
  font-size: 12px;
  color: var(--color-text-muted);
  font-variant-numeric: tabular-nums;
}
.summary-card__value {
  font-size: 30px;
  font-weight: 500;
  color: var(--color-accent);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.01em;
  line-height: 1.1;
}

/* --------------------- Tiles --------------------- */

.tile {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 18px var(--space-3);
  text-align: center;
  transition: all 0.15s ease;
}
.tile:hover, .tile:focus-visible {
  background: var(--color-accent-hover-bg);
  border-color: var(--color-border-hover);
  outline: none;
}
.tile__title {
  font-weight: 500;
  margin-top: 10px;
  letter-spacing: 0.04em;
  font-size: 15px;
}
.tile__subtitle {
  font-size: 12px;
  color: var(--color-text-muted);
  margin-top: 3px;
}

.tile--primary { min-height: 130px; padding: 22px var(--space-3); }
.tile--primary .ti { font-size: 38px; color: var(--color-accent); }

.tile--secondary { min-height: 90px; padding: 14px var(--space-2); }
.tile--secondary .ti { font-size: 22px; color: var(--color-icon-secondary); }
.tile--secondary .tile__title {
  font-size: 12px;
  color: var(--color-text-soft);
  margin-top: 6px;
  letter-spacing: 0;
}

.tile--wide {
  flex-direction: row;
  align-items: center;
  justify-content: flex-start;
  gap: var(--space-4);
  padding: 18px 22px;
  min-height: 80px;
  text-align: left;
}
.tile--wide .ti { font-size: 36px; color: var(--color-accent); }
.tile--wide .tile__arrow {
  margin-left: auto;
  color: var(--color-text-muted);
  font-size: 22px;
}

.tile--disabled { opacity: 0.5; cursor: not-allowed; }
.tile--disabled:hover {
  background: var(--color-surface);
  border-color: var(--color-border);
}

/* --------------------- Tile grids --------------------- */

.tile-grid { display: grid; gap: var(--space-2); }
.tile-grid--primary {
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
}
.tile-grid--secondary { grid-template-columns: repeat(3, 1fr); }
@media (min-width: 640px) {
  .tile-grid--secondary { grid-template-columns: repeat(5, 1fr); }
}

/* --------------------- Form --------------------- */

.form {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  margin-bottom: var(--space-5);
}
@media (min-width: 768px) {
  .form { padding: var(--space-5); }
}

.form--editing {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-hover-bg);
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}
@media (min-width: 640px) {
  .form-grid { grid-template-columns: repeat(2, 1fr); }
}
.field--full { grid-column: 1 / -1; }

/* Halter-Checkbox-Reihe (Fixkosten / Wartung) */
.field--checkboxes { gap: var(--space-2); }
.checkbox-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  align-items: center;
  padding: 8px 0 4px;
}
.checkbox {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-family: var(--font-mono);
  letter-spacing: 0.05em;
  color: var(--color-text);
  cursor: pointer;
  user-select: none;
}
.checkbox input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--color-accent);
  cursor: pointer;
}

/* Halter-Spalte in Tabellen — accent wenn nicht alle drei */
.cell-payers {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
  white-space: nowrap;
}
.cell-payers--partial { color: var(--color-accent); font-weight: 600; }

.field { display: flex; flex-direction: column; gap: 6px; }
.field__label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  font-weight: 500;
}
.field__label--required::after {
  content: " *";
  color: var(--color-accent);
}
.field__hint {
  font-size: 12px;
  color: var(--color-text-muted);
  margin-top: 2px;
}

.input,
.select,
.textarea {
  background: var(--color-surface-input);
  color: var(--color-text);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  font-size: 15px;
  font-family: inherit;
  width: 100%;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.input:focus,
.select:focus,
.textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-hover-bg);
}
.textarea { resize: vertical; min-height: 70px; }
.input--icao {
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-family: var(--font-mono);
}

.input[type="number"]::-webkit-outer-spin-button,
.input[type="number"]::-webkit-inner-spin-button {
  -webkit-appearance: none;
  appearance: none;
  margin: 0;
}
.input[type="number"] {
  -moz-appearance: textfield;
  appearance: textfield;
}

/* --------------------- Form heading bar --------------------- */

.form-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--color-border);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.04em;
}
.form-heading__mode { color: var(--color-text-muted); text-transform: uppercase; font-size: 11px; letter-spacing: 0.1em; }
.form--editing .form-heading__mode { color: var(--color-accent); }

/* --------------------- Buttons --------------------- */

.form-actions {
  display: flex;
  gap: var(--space-3);
  justify-content: flex-end;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 10px 20px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-accent);
  background: var(--color-accent);
  color: var(--color-accent-text);
  font-weight: 500;
  font-size: 14px;
  font-family: inherit;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: all 0.15s;
}
.btn:hover { filter: brightness(1.08); }
.btn:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px var(--color-accent-hover-bg);
}
.btn .ti { font-size: 18px; }

.btn--secondary {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border-strong);
}
.btn--secondary:hover {
  background: var(--color-accent-hover-bg);
  filter: none;
}

/* --------------------- Data table --------------------- */

.table-wrapper {
  overflow-x: auto;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  min-width: 600px;
}
.data-table thead th {
  text-align: left;
  padding: 10px 14px;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
  font-weight: 500;
  border-bottom: 1px solid var(--color-border);
  white-space: nowrap;
  background: var(--color-surface-elev);
}
.data-table tbody td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--color-border);
  font-variant-numeric: tabular-nums;
}
.data-table tbody tr:last-child td { border-bottom: none; }
.data-table tbody tr:hover { background: var(--color-accent-hover-bg); }

.data-table tbody tr.is-editing {
  background: var(--color-accent-hover-bg);
  outline: 1px solid var(--color-border-hover);
  outline-offset: -1px;
}

.cell-num { text-align: right; }
.cell-mono { font-family: var(--font-mono); letter-spacing: 0.05em; }
.cell-muted { color: var(--color-text-muted); }
.cell-actions {
  text-align: right;
  white-space: nowrap;
  width: 1%;
}
.cell-filename {
  max-width: 240px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-text-soft);
}

/* --------------------- Row actions --------------------- */

.row-actions {
  display: inline-flex;
  gap: 2px;
}
.row-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: 6px;
  background: transparent;
  border: 1px solid transparent;
  color: var(--color-text-muted);
  cursor: pointer;
  padding: 0;
  font-family: inherit;
  transition: all 0.12s;
}
.row-action:hover, .row-action:focus-visible {
  background: var(--color-accent-hover-bg);
  color: var(--color-accent);
  outline: none;
}
.row-action--danger:hover, .row-action--danger:focus-visible {
  background: var(--color-danger-bg);
  color: var(--color-danger);
}
.row-action .ti { font-size: 16px; }

.empty-state {
  text-align: center;
  padding: var(--space-6);
  color: var(--color-text-muted);
  font-size: 14px;
}

/* --------------------- Toast --------------------- */

.toast {
  position: fixed;
  bottom: var(--space-5);
  left: 50%;
  transform: translateX(-50%) translateY(80px);
  padding: 12px 18px;
  background: var(--color-accent);
  color: var(--color-accent-text);
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 500;
  box-shadow: 0 8px 24px rgba(0,0,0,0.3);
  opacity: 0;
  transition: opacity 0.2s, transform 0.2s;
  pointer-events: none;
  z-index: 1000;
}
.toast--visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}
.toast--error { background: var(--color-danger); color: white; }

/* --------------------- Utility --------------------- */

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
/* --------------------- Halter editor --------------------- */

.halter-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  margin-bottom: var(--space-3);
  background: var(--color-surface);
}
.halter-card:last-child { margin-bottom: 0; }

.halter-card__header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--color-border);
}

.halter-card__code {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 14px;
  color: var(--color-accent);
  letter-spacing: 0.08em;
  padding: 4px 10px;
  background: var(--color-accent-hover-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
}

.halter-card__name {
  font-size: 15px;
  font-weight: 500;
  flex: 1;
}

.halter-card__share {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  color: var(--color-text-muted);
  letter-spacing: 0.02em;
}

.halter-card__addr {
  margin: 0;
}

/* `code` tag in field hints */
.field__hint code {
  background: var(--color-surface-input);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 1px 6px;
  font-size: 0.9em;
  color: var(--color-text-soft);
}

/* --------------------- App stats in header --------------------- */

.app-stats {
  display: flex;
  gap: var(--space-5);
  align-items: center;
  margin-left: auto;
  margin-right: var(--space-4);
}
.app-stat {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  font-variant-numeric: tabular-nums;
  line-height: 1.2;
}
.app-stat__value {
  font-weight: 500;
  font-size: 15px;
  color: var(--color-accent);
}
.app-stat__label {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
}

@media (max-width: 640px) {
  .app-stats {
    order: 3;
    width: 100%;
    justify-content: flex-end;
    margin: 0;
  }
}