/* ============================================================
   Nebenkosten & Steuer – Design an Steuer-Check / SK-Plugins
   ============================================================ */

.nks-app {
  --nks-ink: #0f172a;
  --nks-ink-soft: #334155;
  --nks-muted: #64748b;
  --nks-border: #e2e8f0;
  --nks-border-strong: #cbd5e1;
  --nks-surface: #ffffff;
  --nks-surface-alt: #f8fafc;
  --nks-surface-2: #f1f5f9;
  --nks-accent: #0284c7;
  --nks-accent-hover: #0369a1;
  --nks-accent-bright: #0ea5e9;
  --nks-accent-soft: #e0f2fe;
  --nks-accent-border: #bae6fd;
  --nks-success: #047857;
  --nks-success-soft: #ecfdf5;
  --nks-danger: #b91c1c;
  --nks-radius: 12px;
  --nks-radius-lg: 14px;
  --nks-radius-xl: 20px;
  --nks-shadow: 0 1px 3px rgba(15, 23, 42, 0.06), 0 1px 2px rgba(15, 23, 42, 0.04);
  --nks-shadow-md: 0 4px 6px -1px rgba(15, 23, 42, 0.07), 0 2px 4px -2px rgba(15, 23, 42, 0.05);
  --nks-font: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;

  width: min(1120px, 100%);
  margin: 0 auto;
  padding: 2rem 1rem;
  color: var(--nks-ink);
  font-family: var(--nks-font);
  line-height: 1.55;
  box-sizing: border-box;
}

.nks-app *,
.nks-app *::before,
.nks-app *::after {
  box-sizing: border-box;
}

/* display:* auf Buttons/Panels darf das HTML-Attribut [hidden] nicht überschreiben */
.nks-app [hidden] {
  display: none !important;
}

.nks-shell {
  background: var(--nks-surface);
  border: 1px solid var(--nks-border);
  border-radius: var(--nks-radius-xl);
  box-shadow: var(--nks-shadow);
  overflow: hidden;
}

.nks-brand {
  padding: clamp(1.25rem, 3vw, 2rem) clamp(1.25rem, 3vw, 2rem) 0;
}

.nks-brand-mark {
  margin: 0 0 0.75rem;
  font-size: clamp(1.6rem, 2.6vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: var(--nks-ink);
}

.nks-info {
  margin: 0 0 1.5rem;
  padding: 1rem 1.25rem;
  background: var(--nks-accent-soft);
  border: 1px solid var(--nks-accent-border);
  border-radius: var(--nks-radius);
  color: var(--nks-ink-soft);
  font-size: 0.95rem;
}

/* —— Steps (wie Steuer-Check) —— */
.nks-progress {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.35rem 0;
  padding: 0.5rem 1rem 1.5rem;
}

.nks-step-btn {
  appearance: none;
  border: 0;
  background: transparent;
  padding: 0.25rem 0.35rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
  cursor: pointer;
  color: var(--nks-muted);
  font: inherit;
  min-width: 4.5rem;
}

.nks-step-btn:disabled {
  cursor: default;
  opacity: 0.55;
}

.nks-circle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 999px;
  background: var(--nks-surface-2);
  color: var(--nks-ink-soft);
  font-weight: 600;
  font-size: 1.05rem;
  transition: background 0.15s ease, color 0.15s ease, box-shadow 0.15s ease;
}

.nks-step-btn.is-active .nks-circle,
.nks-step-btn.is-done .nks-circle {
  background: var(--nks-accent);
  color: #fff;
  box-shadow: 0 0 0 4px var(--nks-accent-soft);
}

.nks-step-btn.is-active .nks-label,
.nks-step-btn.is-done .nks-label {
  color: var(--nks-accent);
}

.nks-label {
  font-size: 0.8rem;
  font-weight: 600;
  text-align: center;
  line-height: 1.2;
}

.nks-step-line {
  width: 2.5rem;
  height: 0.25rem;
  margin-top: 1.15rem;
  border-radius: 999px;
  background: var(--nks-surface-2);
  flex-shrink: 0;
}

.nks-step-btn.is-done + .nks-step-line {
  background: var(--nks-accent-bright);
}

/* —— Panels —— */
.nks-panel {
  padding: 0 clamp(1.25rem, 3vw, 2rem) clamp(1.25rem, 3vw, 2rem);
  animation: nks-fade-in 0.35s ease;
}

@keyframes nks-fade-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.nks-panel h2 {
  margin: 0 0 0.35rem;
  padding-bottom: 0.65rem;
  border-bottom: 2px solid var(--nks-accent-soft);
  font-size: clamp(1.35rem, 2.4vw, 1.6rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--nks-ink);
}

.nks-subhead {
  margin: 1.5rem 0 0.75rem;
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--nks-ink-soft);
}

.nks-lead {
  margin: 0.75rem 0 1.25rem;
  color: var(--nks-muted);
}

.nks-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.nks-field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.nks-field label {
  font-size: 0.9375rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--nks-ink-soft);
}

.nks-hint {
  font-size: 0.8rem;
  color: var(--nks-muted);
}

.nks-field input,
.nks-field select {
  display: block;
  width: 100%;
  min-height: 3rem;
  padding: 0.7rem 1rem;
  font: inherit;
  font-size: 1.05rem;
  line-height: 1.4;
  color: var(--nks-ink);
  background: var(--nks-surface-alt);
  border: 1.5px solid var(--nks-border-strong);
  border-radius: var(--nks-radius);
  box-shadow: inset 0 1px 2px rgba(15, 23, 42, 0.03);
  transition: border-color 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
  appearance: none;
}

.nks-field input:hover,
.nks-field select:hover {
  border-color: #94a3b8;
  background: #fff;
}

.nks-field input:focus,
.nks-field select:focus {
  outline: none;
  border-color: var(--nks-accent-bright);
  background: #fff;
  box-shadow: 0 0 0 3px var(--nks-accent-soft);
}

.nks-costs {
  display: grid;
  gap: 0.85rem;
}

.nks-cost-row {
  display: grid;
  grid-template-columns: 1.4fr 0.8fr;
  gap: 0.85rem;
  align-items: end;
  padding-bottom: 0.85rem;
  border-bottom: 1px solid var(--nks-border);
}

.nks-cost-row.is-tax {
  background: var(--nks-accent-soft);
  margin: 0 -0.5rem;
  padding: 0.9rem 0.75rem;
  border-radius: var(--nks-radius);
  border: 1px solid var(--nks-accent-border);
  border-bottom: 1px solid var(--nks-accent-border);
}

/* —— Ergebnis —— */
.nks-balance {
  padding: 1.25rem 1.5rem;
  border-radius: var(--nks-radius-lg);
  background: linear-gradient(135deg, #0284c7 0%, #0ea5e9 100%);
  color: #fff;
  margin-bottom: 1rem;
  box-shadow: var(--nks-shadow-md);
}

.nks-balance.is-refund {
  background: linear-gradient(135deg, #0369a1 0%, #0284c7 100%);
}

.nks-eyebrow {
  margin: 0;
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  opacity: 0.9;
  font-weight: 600;
}

.nks-balance strong {
  display: block;
  margin-top: 0.25rem;
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
}

.nks-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.75rem;
}

.nks-stat {
  padding: 1rem;
  border: 1px solid var(--nks-border);
  border-radius: var(--nks-radius);
  background: var(--nks-surface);
  box-shadow: var(--nks-shadow);
}

.nks-stat span {
  display: block;
  font-size: 0.8rem;
  color: var(--nks-muted);
  font-weight: 500;
}

.nks-stat strong {
  display: block;
  margin-top: 0.25rem;
  font-size: 1.1rem;
  color: var(--nks-accent);
  font-variant-numeric: tabular-nums;
}

.nks-note {
  margin: 1rem 0 0;
  padding: 1rem 1.1rem;
  border-left: 4px solid var(--nks-accent-bright);
  background: var(--nks-accent-soft);
  border-radius: 0 var(--nks-radius) var(--nks-radius) 0;
  color: var(--nks-ink-soft);
  font-size: 0.95rem;
}

.nks-hints {
  display: grid;
  gap: 0.85rem;
}

.nks-hint-item {
  padding: 1.1rem 1.2rem;
  border: 1px solid var(--nks-border);
  border-radius: var(--nks-radius);
  background: var(--nks-surface);
  box-shadow: var(--nks-shadow);
}

.nks-hint-item h3 {
  margin: 0 0 0.35rem;
  font-size: 1rem;
  font-weight: 600;
  color: var(--nks-ink);
}

.nks-hint-item p {
  margin: 0;
  color: var(--nks-muted);
  font-size: 0.92rem;
}

.nks-checklist {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.45rem;
}

.nks-checklist li {
  position: relative;
  padding: 0.65rem 0.85rem 0.65rem 2.1rem;
  color: var(--nks-ink-soft);
  font-size: 0.92rem;
  background: var(--nks-surface-alt);
  border: 1px solid var(--nks-border);
  border-radius: 10px;
}

.nks-checklist li::before {
  content: "";
  position: absolute;
  left: 0.85rem;
  top: 50%;
  width: 0.55rem;
  height: 0.55rem;
  margin-top: -0.28rem;
  border-radius: 999px;
  background: var(--nks-accent-bright);
}

.nks-check {
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
  margin-top: 0.9rem;
  padding: 0.85rem 1rem;
  font-size: 0.92rem;
  color: var(--nks-ink-soft);
  background: var(--nks-surface-alt);
  border: 1.5px solid var(--nks-border-strong);
  border-radius: var(--nks-radius);
}

.nks-check:has(input:checked) {
  border-color: var(--nks-accent-bright);
  background: var(--nks-accent-soft);
}

.nks-check input {
  margin-top: 0.15rem;
  width: 1.25rem;
  height: 1.25rem;
  accent-color: var(--nks-accent);
  cursor: pointer;
  flex-shrink: 0;
}

/* —— Actions / Buttons —— */
.nks-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: space-between;
  padding: 0 clamp(1.25rem, 3vw, 2rem) clamp(1.25rem, 3vw, 2rem);
}

.nks-btn {
  appearance: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 0;
  border-radius: var(--nks-radius);
  padding: 0.75rem 1.5rem;
  font: inherit;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.nks-btn-ghost {
  background: #fff;
  color: var(--nks-ink-soft);
  border: 1.5px solid var(--nks-border-strong);
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.04);
}

.nks-btn-ghost:hover {
  background: var(--nks-surface-alt);
  border-color: #94a3b8;
  color: var(--nks-ink);
}

.nks-btn-primary,
.nks-btn-warm {
  background: linear-gradient(135deg, #0284c7 0%, #0ea5e9 100%);
  color: #fff;
  margin-left: auto;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

.nks-btn-primary:hover,
.nks-btn-warm:hover {
  background: linear-gradient(135deg, #0369a1 0%, #0284c7 100%);
  box-shadow: var(--nks-shadow-md);
  transform: translateY(-1px);
}

.nks-btn:focus {
  outline: none;
  box-shadow: 0 0 0 2px #fff, 0 0 0 4px var(--nks-accent-bright);
}

.nks-error {
  margin: 0.75rem 0 0;
  color: var(--nks-danger);
  font-size: 0.9rem;
  font-weight: 500;
}

.nks-success {
  margin-top: 1rem;
  text-align: center;
  padding: 1.5rem;
  background: var(--nks-success-soft);
  border: 1px solid #a7f3d0;
  border-radius: var(--nks-radius-lg);
}

.nks-success h2 {
  margin-bottom: 0.4rem;
  border-bottom: 0;
  padding-bottom: 0;
  color: var(--nks-success);
}

.nks-disclaimer {
  margin: 1rem clamp(1.25rem, 3vw, 2rem) 1.25rem;
  font-size: 0.8rem;
  color: var(--nks-muted);
}

@media (max-width: 720px) {
  .nks-grid,
  .nks-stats,
  .nks-cost-row {
    grid-template-columns: 1fr;
  }

  .nks-step-line {
    width: 1rem;
  }

  .nks-label {
    font-size: 0.7rem;
  }

  .nks-step-btn {
    min-width: 3.4rem;
  }

  .nks-actions {
    flex-direction: column-reverse;
  }

  .nks-btn,
  .nks-btn-primary,
  .nks-btn-warm {
    width: 100%;
    margin-left: 0;
  }
}

@media print {
  body * {
    visibility: hidden !important;
  }

  .nks-print,
  .nks-print * {
    visibility: visible !important;
  }

  .nks-print {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    padding: 1.5rem;
    color: #000;
    background: #fff;
  }
}