/* ───────────────────────────────────────────────
   Notenberechner — Stylesheet
   Dunkles Theme, schlicht, funktional, System-Sans-Serif.
   Pendant zum Rastergenerator-Projekt.
   ─────────────────────────────────────────────── */

*, *::before, *::after { box-sizing: border-box; }
html, body, h1, h2, h3, h4, h5, p, ul, ol, figure, fieldset { margin: 0; padding: 0; }
fieldset { border: 0; }
button { font: inherit; cursor: pointer; }

[hidden] { display: none !important; }

:root {
  --bg:           #0b0b0c;
  --surface:      #161618;
  --surface-2:    #1d1d20;
  --surface-3:    #25252a;
  --border:       #28282d;
  --border-2:     #3a3a40;
  --text:         #ededed;
  --text-muted:   #a4a8b0;
  --accent:       #5e9bff;
  --accent-hover: #7eb0ff;
  --danger:       #ef4444;
  --danger-bg:    #2a1414;
  --success:      #4ade80;
  --radius:       6px;
  --radius-sm:    4px;
  --header-h:     64px;
  --footer-h:     56px;
  --maxw:         1280px;
  --gap:          1rem;
  --pad:          1.25rem;
  color-scheme:   dark;
}

html, body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
               Ubuntu, Cantarell, "Helvetica Neue", Arial, sans-serif;
  font-size: 0.9375rem;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

body { display: flex; flex-direction: column; min-height: 100vh; }

.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;
}

.skip-link {
  position: absolute;
  top: -100px; left: 0;
  background: var(--text); color: var(--bg);
  padding: 0.5rem 1rem;
  text-decoration: none;
  z-index: 100;
}
.skip-link:focus,
.skip-link:focus-visible { top: 0; }

a { color: var(--accent); text-decoration: none; }
a:hover, a:focus-visible { text-decoration: underline; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ── Header ── */
.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.header-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0.875rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}
.brand {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  color: var(--text);
  text-decoration: none;
  font-weight: 600;
  font-size: 1.125rem;
}
.brand:hover, .brand:focus-visible { text-decoration: none; color: var(--accent); }
.brand-mark { width: 28px; height: 28px; flex-shrink: 0; color: var(--accent); }
.brand-text { letter-spacing: -0.01em; }
.brand-tagline {
  color: var(--text-muted);
  font-size: 0.875rem;
  margin-left: auto;
}

/* ── Tool-Navigation ── */
.tool-nav-wrapper {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  position: relative;
}
.tool-nav {
  max-width: var(--maxw);
  margin: 0 auto;
}
.tool-nav-list {
  list-style: none;
  padding: 0 1rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  align-items: center;
}
.tool-nav-list a {
  display: inline-block;
  padding: 0.625rem 0.875rem;
  font-size: 0.875rem;
  color: var(--text-muted);
  border-bottom: 2px solid transparent;
}
.tool-nav-list a:hover,
.tool-nav-list a:focus-visible {
  color: var(--text);
  text-decoration: none;
  border-bottom-color: var(--border-2);
}
.tool-nav-list a[aria-current="page"] {
  color: var(--accent);
  border-bottom-color: var(--accent);
  font-weight: 500;
}

/* Burger-Toggle (nur auf schmalen Bildschirmen sichtbar) */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.6rem;
  width: 100%;
  padding: 0.7rem 1rem;
  background: var(--surface);
  border: 0;
  border-bottom: 1px solid var(--border);
  color: var(--text);
  font-size: 0.9rem;
  font-weight: 500;
  text-align: left;
}
.nav-toggle:hover { background: var(--surface-2); }
.nav-toggle-icon {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  width: 22px;
  height: 16px;
  justify-content: center;
}
.nav-toggle-icon span {
  display: block;
  width: 22px; height: 2px;
  background: var(--text);
  border-radius: 1px;
  transition: transform 0.18s ease, opacity 0.18s ease;
}
.nav-toggle.open .nav-toggle-icon span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}
.nav-toggle.open .nav-toggle-icon span:nth-child(2) { opacity: 0; }
.nav-toggle.open .nav-toggle-icon span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* ── Layout ── */
main.layout {
  flex: 1;
  max-width: var(--maxw);
  width: 100%;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 2rem;
}

.layout > h1 {
  font-size: 1.6rem;
  letter-spacing: -0.01em;
  margin-bottom: 0.25rem;
}
.layout > .lead {
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  max-width: 70ch;
}

/* ── Statische Seiten ── */
.page {
  flex: 1;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 1.5rem 1.5rem 2rem;
  width: 100%;
}
.prose { max-width: 65ch; }
.prose h1 { font-size: 1.75rem; margin-bottom: 1rem; letter-spacing: -0.01em; }
.prose h2 { font-size: 1.1rem; margin: 1.25rem 0 0.5rem; color: var(--text-muted); font-weight: 500; }
.prose p  { margin-bottom: 1rem; color: var(--text-muted); }
.prose address { font-style: normal; line-height: 1.7; color: var(--text); }
.prose a { color: var(--accent); }

/* ── Hub-Karten ── */
.hub-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 0.875rem;
  margin-top: 1.25rem;
}
.hub-card {
  display: block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.125rem;
  color: var(--text);
  transition: border-color 0.12s, transform 0.12s;
}
.hub-card:hover, .hub-card:focus-visible {
  text-decoration: none;
  border-color: var(--accent);
  transform: translateY(-1px);
}
.hub-card h2 {
  font-size: 1rem;
  margin-bottom: 0.25rem;
  color: var(--text);
}
.hub-card p {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin: 0;
}
.hub-disclaimer {
  margin-top: 2rem;
  padding: 0.875rem 1rem;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ── Cards / Panels ── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.125rem;
  margin-bottom: 1rem;
}
.card + .card { margin-top: 0.75rem; }

.card h2 {
  font-size: 1rem;
  margin-bottom: 0.875rem;
  color: var(--text);
  letter-spacing: -0.01em;
}

/* Panel mit Summary-Toggle */
details.panel {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 0.75rem;
  overflow: hidden;
}
details.panel > summary {
  padding: 0.625rem 0.875rem;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  user-select: none;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
details.panel > summary::-webkit-details-marker { display: none; }
details.panel > summary::after {
  content: "+";
  color: var(--text-muted);
  font-weight: 400;
  font-size: 1.25rem;
  line-height: 1;
}
details.panel[open] > summary::after { content: "−"; }
details.panel > .panel-body {
  padding: 0.875rem;
  border-top: 1px solid var(--border);
  background: var(--surface);
}

/* ── Grid für Tool-Eingaben ── */
.grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 0.75rem;
  align-items: start;
}
.grid > [data-span] { display: flex; flex-direction: column; }
[data-span="3"]  { grid-column: span 3; }
[data-span="4"]  { grid-column: span 4; }
[data-span="6"]  { grid-column: span 6; }
[data-span="9"]  { grid-column: span 9; }
[data-span="12"] { grid-column: span 12; }

@media (max-width: 860px) {
  .grid { grid-template-columns: repeat(6, 1fr); }
  [data-span="3"], [data-span="4"] { grid-column: span 3; }
  [data-span="6"], [data-span="9"], [data-span="12"] { grid-column: span 6; }
}
@media (max-width: 520px) {
  .grid { grid-template-columns: 1fr; }
  [data-span="3"], [data-span="4"], [data-span="6"], [data-span="9"], [data-span="12"] { grid-column: span 1; }
}

/* ── Formular-Felder ── */
.field { display: flex; flex-direction: column; gap: 0.25rem; min-width: 0; }
.field > label, .field > legend {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 500;
}
.field-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.625rem;
}
@media (max-width: 480px) {
  .field-row { grid-template-columns: 1fr; }
}

input[type="number"],
input[type="text"],
select,
textarea {
  appearance: none;
  background: var(--surface-3);
  border: 1px solid var(--border-2);
  border-radius: var(--radius-sm);
  padding: 0.45rem 0.6rem;
  font: inherit;
  color: var(--text);
  width: 100%;
  min-width: 0;
}
textarea {
  resize: vertical;
  min-height: 100px;
  line-height: 1.4;
}
input[type="number"]:focus-visible,
input[type="text"]:focus-visible,
select:focus-visible,
textarea:focus-visible {
  border-color: var(--accent);
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
input:disabled, select:disabled, textarea:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

select {
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 12'><path d='M3 5l3 3 3-3' fill='none' stroke='%23a4a8b0' stroke-width='1.5'/></svg>");
  background-repeat: no-repeat;
  background-position: right 0.55rem center;
  padding-right: 1.75rem;
}

.check {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--text);
  cursor: pointer;
}
.check input { accent-color: var(--accent); }

.hint {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin: 0;
}

.sep {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 0.75rem 0;
}

/* ── Buttons ── */
.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}
.btn {
  background: var(--surface-2);
  border: 1px solid var(--border-2);
  border-radius: var(--radius-sm);
  padding: 0.5rem 0.85rem;
  font-size: 0.875rem;
  color: var(--text);
  font-weight: 500;
  transition: background-color 0.12s, border-color 0.12s;
  text-align: center;
}
.btn:hover { background: var(--bg); border-color: var(--text-muted); }
.btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #07111f;
  font-weight: 600;
}
.btn.primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
.btn.ghost {
  background: transparent;
  border-color: transparent;
  color: var(--text-muted);
}
.btn.ghost:hover {
  background: var(--bg);
  color: var(--text);
  border-color: var(--border-2);
}
.btn:disabled, .btn[aria-disabled="true"] {
  opacity: 0.45;
  cursor: not-allowed;
  pointer-events: none;
}
.btn-tiny {
  background: var(--surface-2);
  border: 1px solid var(--border-2);
  border-radius: var(--radius-sm);
  padding: 0.15rem 0.5rem;
  font-size: 0.75rem;
  color: var(--text-muted);
}
.btn-tiny:hover { background: var(--bg); color: var(--text); }

/* ── Ergebnis-Bereiche ── */
.result {
  margin-top: 1rem;
  padding: 0.875rem 1rem;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.result.empty { opacity: 0.5; }
.result-meta {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}
.result-big {
  display: block;
  font-size: 2.25rem;
  font-weight: 700;
  line-height: 1.05;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}
.pill {
  display: inline-block;
  padding: 0.1rem 0.55rem;
  border-radius: 999px;
  background: var(--surface-3);
  font-size: 0.72rem;
  margin-left: 0.4rem;
  color: var(--text-muted);
}

/* ── Fehler ──
   Wichtig: aria-live/role="alert" bleiben im DOM präsent, daher kein
   display:none — sonst kündigt der Screenreader spätere Befüllung nicht an.
   Stattdessen visuell ausblenden mit visibility, Höhe einklappen. */
.err {
  margin-top: 0.75rem;
  padding: 0.6rem 0.8rem;
  font-size: 0.85rem;
  color: #ffb4b4;
  background: var(--danger-bg);
  border: 1px solid var(--danger);
  border-radius: var(--radius-sm);
}
.err:empty {
  visibility: hidden;
  margin: 0;
  padding: 0;
  border: 0;
  height: 0;
  overflow: hidden;
}
.err:not(:empty)::before {
  content: "⚠️";
  margin-right: 0.4rem;
  font-style: normal;
}

/* ── Tabellen ── */
table.table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 0.6rem;
}
table.table th, table.table td {
  padding: 0.45rem 0.6rem;
  border-bottom: 1px solid var(--border);
  text-align: left;
  font-size: 0.875rem;
}
table.table th {
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-muted);
  font-weight: 600;
  background: var(--surface-2);
}
table.table tbody tr:hover { background: var(--surface-2); }
table.table td.num { font-variant-numeric: tabular-nums; }

/* Kompakte Tabelle: Werte links zusammen, Tabellenlinien bis ganz rechts.
   Erreicht durch eine unsichtbare Filler-Spalte (.col-filler) am Ende, die
   die restliche Breite einnimmt. */
table.table--compact { width: 100%; }
table.table--compact th,
table.table--compact td { padding-right: 2rem; white-space: nowrap; }
table.table--compact th:nth-last-child(2),
table.table--compact td:nth-last-child(2) { padding-right: 0.75rem; }
table.table--compact th.col-filler,
table.table--compact td.col-filler {
  width: 100%;
  padding: 0;
  white-space: normal;
}
.table-wrap { overflow-x: auto; }

/* ── Snapshots-Liste ── */
.snap-list {
  list-style: none;
  margin: 0.5rem 0;
  padding: 0;
  font-size: 0.85rem;
}
.snap-list:empty { display: none; }
.snap-list li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0;
  border-bottom: 1px solid var(--border);
}
.snap-list li:last-child { border-bottom: 0; }
.snap-list li > span {
  flex: 1; min-width: 0;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.hub-snap-meta strong { color: var(--text); font-weight: 600; }
.hub-snap-date {
  color: var(--text-muted);
  font-style: normal;
  font-size: 0.78rem;
  white-space: nowrap;
}

/* ── Block-Karten (Blocknoten) ── */
.blocks {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 0.75rem;
  margin-bottom: 0.875rem;
}
.block-card {
  position: relative;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.875rem;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}
.block-remove {
  position: absolute;
  top: 0.5rem; right: 0.5rem;
  width: 22px; height: 22px;
  border-radius: 999px;
  border: 1px solid var(--border-2);
  background: var(--surface);
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.95rem;
  line-height: 1;
  padding: 0;
}
.block-remove:hover { color: var(--danger); border-color: var(--danger); }
.block-notes-label {
  display: block;
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 500;
  margin-bottom: 0.2rem;
}
.block-notes-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.35rem;
}
.block-notes-grid input {
  text-align: center;
  padding: 0.4rem 0.25rem;
  font-variant-numeric: tabular-nums;
}
.block-result {
  margin-top: 0.25rem;
  padding-top: 0.45rem;
  border-top: 1px solid var(--border);
  font-size: 0.78rem;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

/* ── Loading-Overlay ── */
.loading-overlay {
  position: fixed;
  inset: 0;
  background: rgba(11, 11, 12, 0.78);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.875rem;
  z-index: 200;
  backdrop-filter: blur(2px);
}
.loading-overlay p {
  color: var(--text);
  margin: 0;
  font-size: 0.95rem;
}
.spinner {
  width: 36px;
  height: 36px;
  border: 3px solid var(--border-2);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Footer ── */
.site-footer {
  background: var(--surface);
  border-top: 1px solid var(--border);
  flex-shrink: 0;
  margin-top: auto;
}
.footer-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0.875rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}
.footer-copy { color: var(--text-muted); font-size: 0.85rem; }
.footer-nav { display: flex; align-items: center; gap: 1.25rem; }
.footer-nav a { color: var(--text-muted); font-size: 0.85rem; }
.footer-nav a:hover, .footer-nav a:focus-visible { color: var(--text); }
.footer-nav a.footer-more {
  border: 1px solid var(--border-2);
  border-radius: var(--radius-sm);
  padding: 0.25rem 0.7rem;
  color: var(--text);
}
.footer-nav a.footer-more:hover {
  background: var(--surface-2);
  text-decoration: none;
  border-color: var(--accent);
  color: var(--accent);
}

/* ── Utility-Klassen (statt Inline-Styles in Templates) ── */
.actions-end { justify-content: flex-end; }
.mt-sm { margin-top: 0.5rem; }
.mt-md { margin-top: 0.875rem; }
.mt-lg { margin-top: 1rem; }
.flash-hint { opacity: 0; transition: opacity 0.4s; }
.tabnum { font-variant-numeric: tabular-nums; }
.result-grid { display: grid; gap: 0.5rem; margin-top: 0.5rem; }

/* ── Responsive ── */
@media (max-width: 900px) {
  .header-inner { padding: 0.75rem 1rem; }
  .brand-tagline { display: none; }
  main.layout { padding: 1rem; }
  .footer-inner { padding: 0.75rem 1rem; }
}

/* Burger-Menü unterhalb 760px: Liste ausgeblendet, Toggle sichtbar */
@media (max-width: 760px) {
  .nav-toggle { display: inline-flex; }
  .tool-nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0;
    border-top: 1px solid var(--border);
  }
  .tool-nav.open .tool-nav-list { display: flex; }
  .tool-nav-list li { border-bottom: 1px solid var(--border); }
  .tool-nav-list li:last-child { border-bottom: 0; }
  .tool-nav-list a {
    display: block;
    padding: 0.75rem 1rem;
    border-bottom: 0;
  }
  .tool-nav-list a[aria-current="page"] {
    border-bottom: 0;
    background: var(--surface-2);
  }
}

/* ── Druck ── */
@media print {
  .site-header, .tool-nav, .site-footer, .actions, .snap-list,
  details.panel:not([open]) > summary::after { display: none; }
  body, main.layout, .card, .result, .hub-card, .block-card {
    background: #fff;
    color: #000;
    border: 0;
    box-shadow: none;
  }
  .hub-grid, .blocks { display: block; }
  .hub-card, .block-card { margin-bottom: 0.5rem; padding: 0.5rem 0; }
  table.table th { background: #f0f0f0; color: #000; }
}