:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --text: #1b2430;
  --muted: #5d6b7a;
  --border: #dde2e8;
  --accent: #1d6fb8;
  --accent-text: #ffffff;
  --accent-soft: #e6f0fa;
  --input-bg: #fffdf2;
  --danger: #b42318;
  --danger-soft: #fdecea;
  --warning: #8a5a00;
  --warning-soft: #fff4d6;
  --ok: #217a3c;
  --radius: 10px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #12161c;
    --surface: #1a2028;
    --text: #e6eaef;
    --muted: #9aa6b2;
    --border: #2c3540;
    --accent: #5aa7ec;
    --accent-text: #0b1520;
    --accent-soft: #1b2b3c;
    --input-bg: #222a33;
    --danger: #f3897f;
    --danger-soft: #3a1f1d;
    --warning: #f0c060;
    --warning-soft: #362c15;
    --ok: #6fcf8a;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

.page { max-width: 1040px; margin: 0 auto; padding: 32px 16px 80px; }
.page-header h1 { margin: 0 0 8px; font-size: 1.9rem; }
.eyebrow { margin: 0 0 4px; font-size: 0.85rem; }
.eyebrow a { color: var(--muted); text-decoration: none; }
.lede { margin: 0 0 24px; color: var(--muted); max-width: 62ch; }
.muted { color: var(--muted); }
.small { font-size: 0.85rem; font-weight: normal; }

.step {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 16px;
}
.step h2 { margin: 0 0 12px; font-size: 1.2rem; display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.step h3 { margin: 24px 0 8px; font-size: 1rem; }
.step-number {
  display: inline-grid; place-items: center;
  width: 26px; height: 26px; border-radius: 50%;
  background: var(--accent-soft); color: var(--accent);
  font-size: 0.9rem; font-weight: 700;
}

/* File upload */
.dropzone {
  display: flex; flex-direction: column; align-items: center; gap: 4px;
  padding: 28px 16px; border: 2px dashed var(--border); border-radius: var(--radius);
  cursor: pointer; text-align: center; color: var(--muted);
}
.dropzone strong { color: var(--text); }
.dropzone:hover, .dropzone.dragging { border-color: var(--accent); background: var(--accent-soft); }
.dropzone input { position: absolute; width: 1px; height: 1px; opacity: 0; }
.file-status { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; }
.file-status div { display: flex; flex-direction: column; }

/* Buttons and inputs */
.button {
  font: inherit; border-radius: 8px; padding: 8px 16px; cursor: pointer;
  border: 1px solid transparent;
}
.button.primary { background: var(--accent); color: var(--accent-text); font-weight: 600; }
.button.secondary { background: var(--surface); color: var(--text); border-color: var(--border); }
.button.link { background: none; color: var(--accent); padding: 8px 4px; }
.button:hover { filter: brightness(1.05); }
.button:focus-visible, input:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }

input[type="text"] {
  font: inherit; color: var(--text); background: var(--input-bg);
  border: 1px solid var(--border); border-radius: 6px; padding: 5px 8px; width: 100%;
}
input.invalid { border-color: var(--danger); background: var(--danger-soft); }

.toolbar { display: flex; flex-wrap: wrap; align-items: end; gap: 12px; margin: 12px 0; }
.toolbar label { display: flex; flex-direction: column; font-size: 0.85rem; color: var(--muted); gap: 2px; }
.toolbar input { width: auto; }
select {
  font: inherit; color: var(--text); background: var(--surface);
  border: 1px solid var(--border); border-radius: 6px; padding: 5px 8px;
}
.no-addresses .address-col { display: none; }

/* Tables */
.table-wrap { overflow-x: auto; margin: 0 -4px 12px; padding: 0 4px; }
.data-table { width: 100%; border-collapse: collapse; font-variant-numeric: tabular-nums; }
.data-table th, .data-table td { padding: 6px 8px; border-bottom: 1px solid var(--border); text-align: left; white-space: nowrap; }
.data-table th { font-size: 0.8rem; font-weight: 600; color: var(--muted); }
.data-table .num { text-align: right; }
.data-table td input { min-width: 110px; }
.data-table td.num input { text-align: right; }
.data-table tfoot td { font-weight: 700; border-top: 2px solid var(--border); border-bottom: none; }
.data-table tr.locked td { color: var(--muted); }

.check { font-size: 0.85rem; white-space: normal; min-width: 180px; }
.check.ok { color: var(--ok); }
.check.warning { color: var(--warning); }
.check.error { color: var(--danger); }

/* Messages */
.error-box {
  background: var(--danger-soft); color: var(--danger);
  border-radius: 8px; padding: 10px 14px; margin: 12px 0 0;
}
.error-box ul { margin: 6px 0 0; padding-left: 20px; }
.notice {
  background: var(--accent-soft); border-radius: 8px; padding: 10px 14px; margin-bottom: 12px; font-size: 0.92rem;
}
.notice p { margin: 0 0 6px; }
.notice ul { margin: 0; padding-left: 20px; }
.notice a { color: var(--accent); }
.stale-note { background: var(--warning-soft); color: var(--warning); border-radius: 8px; padding: 10px 14px; }

details.inline-form summary, details.explanation summary { cursor: pointer; color: var(--accent); margin-top: 12px; }

/* Results */
.results-header { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; margin-bottom: 12px; }
.results-header h2 { margin: 0; }
.tiles { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 10px; margin-bottom: 16px; }
.tile { background: var(--bg); border-radius: 8px; padding: 12px; }
.tile span { display: block; font-size: 0.8rem; color: var(--muted); }
.tile strong { font-size: 1.25rem; font-variant-numeric: tabular-nums; }
.results-table tbody tr.apartment-row { cursor: pointer; }
.results-table tbody tr.apartment-row:hover { background: var(--accent-soft); }
.results-table tr.period-row td { font-size: 0.85rem; color: var(--muted); background: var(--bg); }
.positive { color: var(--danger); }
.negative { color: var(--ok); }
.explanation p { max-width: 70ch; }

/* Landing page */
.tool-list { list-style: none; padding: 0; display: grid; gap: 12px; }
.tool-list a {
  display: flex; flex-direction: column; gap: 2px; padding: 16px 20px;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  color: var(--text); text-decoration: none;
}
.tool-list a:hover { border-color: var(--accent); }
.tool-list span { color: var(--muted); }