/* ============================================================
   FLUGBUCH-RECHNER — Design Tokens
   Aviation cockpit theme: deep sky blue (day) / amber glow (night)
   ============================================================ */

:root {
  /* Type scale */
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --text-readout: clamp(2.5rem, 1.8rem + 3.5vw, 4.5rem);

  /* Spacing (4px base) */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;

  --radius-sm: 0.375rem;
  --radius-md: 0.625rem;
  --radius-lg: 1rem;
  --radius-xl: 1.25rem;
  --radius-full: 9999px;

  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  --content-narrow: 640px;
  --content-default: 760px;

  --font-display: 'Space Grotesk', 'Segoe UI', sans-serif;
  --font-body: 'Inter', 'Segoe UI', sans-serif;
}

:root,
[data-theme='light'] {
  /* Surfaces — pale sky / instrument panel white */
  --color-bg: #eef2f6;
  --color-surface: #ffffff;
  --color-surface-2: #f7f9fb;
  --color-surface-offset: #e4e9ef;
  --color-panel: #10233d;
  --color-panel-text: #f4d9a3;
  --color-divider: #d8dee6;
  --color-border: #c7cfd9;

  --color-text: #10202f;
  --color-text-muted: #55677a;
  --color-text-faint: #93a1b0;
  --color-text-inverse: #f6f8fa;

  /* Primary accent — aviation blue */
  --color-primary: #0a5fa8;
  --color-primary-hover: #084c86;
  --color-primary-active: #073d6c;
  --color-primary-highlight: #d6e6f5;

  /* Secondary accent — instrument amber (used for readout / highlights) */
  --color-amber: #c97a1f;
  --color-amber-hover: #a8650f;
  --color-amber-highlight: #f6e3c6;

  --color-error: #b3261e;
  --color-error-highlight: #f6dad8;
  --color-success: #2f7d4f;
  --color-success-highlight: #d9ecdf;

  --shadow-sm: 0 1px 2px oklch(0.2 0.02 240 / 0.08);
  --shadow-md: 0 6px 16px oklch(0.2 0.02 240 / 0.12);
  --shadow-lg: 0 16px 40px oklch(0.2 0.02 240 / 0.18);
}

[data-theme='dark'] {
  --color-bg: #0b1420;
  --color-surface: #101d2e;
  --color-surface-2: #142336;
  --color-surface-offset: #182940;
  --color-panel: #060d17;
  --color-panel-text: #f2c977;
  --color-divider: #22344b;
  --color-border: #2c4160;

  --color-text: #e6edf5;
  --color-text-muted: #9aacc2;
  --color-text-faint: #5f7590;
  --color-text-inverse: #0b1420;

  --color-primary: #4fa3e3;
  --color-primary-hover: #7cbbec;
  --color-primary-active: #a4cef2;
  --color-primary-highlight: #1b3350;

  --color-amber: #f2b64a;
  --color-amber-hover: #f7cd7c;
  --color-amber-highlight: #3a2c14;

  --color-error: #e57b74;
  --color-error-highlight: #3c1e1c;
  --color-success: #77c99a;
  --color-success-highlight: #16311f;

  --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.3);
  --shadow-md: 0 6px 16px oklch(0 0 0 / 0.4);
  --shadow-lg: 0 16px 40px oklch(0 0 0 / 0.5);
}

/* ============================================================
   Layout
   ============================================================ */

body {
  background: var(--color-bg);
  color: var(--color-text);
}

.page {
  max-width: var(--content-default);
  margin-inline: auto;
  padding: var(--space-6) var(--space-4) var(--space-20);
}

.top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: var(--space-8);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.brand-logo {
  width: 40px;
  height: 40px;
  color: var(--color-primary);
  flex-shrink: 0;
}

.brand-name {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--text-lg);
  letter-spacing: -0.01em;
}

.brand-tag {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.top-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
}

.icon-btn {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  border-radius: var(--radius-full);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  box-shadow: var(--shadow-sm);
  flex-shrink: 0;
}
.icon-btn:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
}
#reset-btn:hover {
  color: var(--color-error);
  border-color: var(--color-error);
}

.intro {
  margin-bottom: var(--space-8);
}

.intro h1 {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 600;
  margin-bottom: var(--space-2);
}

.intro p {
  color: var(--color-text-muted);
  font-size: var(--text-base);
  max-width: 60ch;
}

/* ============================================================
   Cards
   ============================================================ */

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  padding: var(--space-6);
  margin-bottom: var(--space-6);
}

.card-title {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 600;
  margin-bottom: var(--space-4);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.card-title svg {
  width: 18px;
  height: 18px;
  color: var(--color-primary);
  flex-shrink: 0;
}

.field-hint {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: var(--space-2);
}

/* ============================================================
   Form controls
   ============================================================ */

.field-row {
  display: flex;
  gap: var(--space-3);
  align-items: flex-end;
  flex-wrap: wrap;
}

.field {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  flex: 1;
  min-width: 160px;
}

.field label {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.field input[type='text'] {
  background: var(--color-surface-2);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-lg);
  font-variant-numeric: tabular-nums;
  color: var(--color-text);
  min-height: 52px;
}

.field input[type='text']:focus {
  border-color: var(--color-primary);
  outline: none;
  box-shadow: 0 0 0 3px var(--color-primary-highlight);
}

.field input.invalid {
  border-color: var(--color-error);
  box-shadow: 0 0 0 3px var(--color-error-highlight);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 600;
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-md);
  min-height: 52px;
  white-space: nowrap;
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}
.btn-primary:hover {
  background: var(--color-primary-hover);
}
.btn-primary:active {
  background: var(--color-primary-active);
}

.btn-secondary {
  background: var(--color-surface-2);
  color: var(--color-text);
  border: 1.5px solid var(--color-border);
}
.btn-secondary:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn-ghost {
  background: transparent;
  color: var(--color-text-muted);
  font-size: var(--text-xs);
  min-height: auto;
  padding: var(--space-2) var(--space-3);
}
.btn-ghost:hover {
  color: var(--color-error);
}

.btn-danger {
  background: var(--color-error);
  color: #fff;
}
.btn-danger:hover {
  filter: brightness(1.08);
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(10, 15, 25, 0.55);
  display: grid;
  place-items: center;
  padding: var(--space-4);
  z-index: 100;
}
.modal-backdrop[hidden] {
  display: none;
}
.modal-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  box-shadow: 0 20px 50px rgba(0,0,0,0.35);
  padding: var(--space-6);
  max-width: 380px;
  width: 100%;
}
.modal-card h2 {
  font-size: var(--text-lg);
  margin-bottom: var(--space-2);
  color: var(--color-text);
}
.modal-card p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-5);
}
.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-3);
}
.modal-actions .btn {
  min-height: 44px;
}

/* ============================================================
   Entries list
   ============================================================ */

.entries-empty {
  text-align: center;
  padding: var(--space-8) var(--space-4);
  color: var(--color-text-faint);
  font-size: var(--text-sm);
}

.entries-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-top: var(--space-4);
}

.entry-row {
  display: grid;
  grid-template-columns: auto 1fr auto auto;
  align-items: center;
  gap: var(--space-3);
  background: var(--color-surface-2);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
}

.entry-index {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  font-variant-numeric: tabular-nums;
  width: 1.75rem;
}

.entry-raw {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.entry-raw .raw-invalid {
  color: var(--color-error);
}

.entry-normalized {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  color: var(--color-text);
  justify-self: end;
}

.entry-remove {
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  border-radius: var(--radius-full);
  color: var(--color-text-faint);
}
.entry-remove:hover {
  background: var(--color-error-highlight);
  color: var(--color-error);
}
.entry-remove svg {
  width: 16px;
  height: 16px;
}

/* ============================================================
   Readout panel (cockpit instrument look)
   ============================================================ */

.readout-panel {
  background: var(--color-panel);
  border-radius: var(--radius-xl);
  padding: var(--space-8) var(--space-6);
  box-shadow: var(--shadow-lg);
  text-align: center;
  position: relative;
  overflow: hidden;
  border: 1px solid oklch(from var(--color-panel) l c h / 1);
}

.readout-panel::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(
    ellipse at top,
    oklch(from var(--color-amber) l c h / 0.16),
    transparent 65%
  );
  pointer-events: none;
}

.readout-label {
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: color-mix(in oklab, var(--color-panel-text) 65%, transparent);
  margin-bottom: var(--space-3);
  position: relative;
}

.readout-value {
  font-family: var(--font-display);
  font-size: var(--text-readout);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--color-panel-text);
  letter-spacing: 0.02em;
  text-shadow: 0 0 24px oklch(from var(--color-amber) l c h / 0.45);
  position: relative;
}

.readout-breakdown {
  margin-top: var(--space-4);
  font-size: var(--text-sm);
  color: color-mix(in oklab, var(--color-panel-text) 55%, transparent);
  position: relative;
  font-variant-numeric: tabular-nums;
}

.readout-actions {
  display: flex;
  gap: var(--space-3);
  justify-content: center;
  margin-top: var(--space-6);
  flex-wrap: wrap;
  position: relative;
}

/* ============================================================
   Footer note
   ============================================================ */

.footnote {
  text-align: center;
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  margin-top: var(--space-10);
}

/* ============================================================
   Toast (validation feedback)
   ============================================================ */

.toast {
  position: fixed;
  left: 50%;
  bottom: var(--space-8);
  transform: translateX(-50%) translateY(12px);
  background: var(--color-error);
  color: var(--color-text-inverse);
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 600;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  pointer-events: none;
  transition: opacity 220ms ease, transform 220ms ease;
  z-index: 50;
}

.toast.visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ============================================================
   Print summary (hidden on screen, shown only when printing)
   ============================================================ */

.print-summary {
  display: none;
}

@media print {
  body * {
    visibility: hidden;
  }
  .print-summary,
  .print-summary * {
    visibility: visible;
  }
  .print-summary {
    display: block;
    position: absolute;
    inset: 0;
    width: auto;
    margin: 0;
    padding: 2rem;
    background: #ffffff;
    color: #10202f;
    font-family: var(--font-body, sans-serif);
  }
  .print-header {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    border-bottom: 2px solid #10202f;
    padding-bottom: 0.75rem;
    margin-bottom: 1.5rem;
  }
  .print-brand {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.25rem;
  }
  .print-date {
    font-size: 0.875rem;
    color: #55677a;
  }
  .print-table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1.5rem;
  }
  .print-table td {
    padding: 0.6rem 0;
    border-bottom: 1px solid #d8dee6;
    font-size: 1rem;
  }
  .print-table .print-val {
    text-align: right;
    font-weight: 600;
    font-variant-numeric: tabular-nums;
  }
  .print-total-row {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    border-top: 2px solid #10202f;
    padding-top: 1rem;
    font-family: var(--font-display);
    font-weight: 700;
  }
  .print-total-value {
    font-size: 2.5rem;
    font-variant-numeric: tabular-nums;
  }
  @page {
    margin: 1.5cm;
  }
}

/* ============================================================
   Responsive
   ============================================================ */

@media (max-width: 560px) {
  .entry-row {
    grid-template-columns: auto 1fr auto;
    row-gap: var(--space-1);
  }
  .entry-normalized {
    grid-column: 2 / 3;
    justify-self: start;
    margin-top: var(--space-1);
  }
  .entry-remove {
    grid-row: 1 / 3;
  }
  .btn {
    flex: 1;
  }
}