:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --text: #1b1f24;
  --muted: #5d6673;
  --border: #dde1e6;
  --accent: #e8590c;
  --pos: #1a7f37;
  --neg: #c62828;
  --radius: 10px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15181c;
    --surface: #1e2227;
    --text: #e8eaed;
    --muted: #9aa3ae;
    --border: #333a42;
    --accent: #ff8a3d;
    --pos: #4cc76a;
    --neg: #ff6b6b;
  }
}

* { box-sizing: border-box; }

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

.wrap { max-width: 1600px; margin: 0 auto; padding: 0 clamp(16px, 2.5vw, 40px); }

.site-header { background: var(--surface); border-bottom: 1px solid var(--border); }
.site-header .wrap { display: flex; align-items: baseline; gap: 12px; padding-block: 14px; flex-wrap: wrap; }
.brand { font-weight: 800; font-size: 1.3rem; color: var(--text); text-decoration: none; }
.brand span { color: var(--accent); }
.tagline { color: var(--muted); font-size: .9rem; }

.intro h1 { font-size: 1.8rem; margin: 28px 0 8px; }
.intro p { color: var(--muted); margin: 0 0 24px; max-width: 70ch; }

.layout { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 20px; align-items: start; }
@media (max-width: 820px) { .layout { grid-template-columns: minmax(0, 1fr); } }

.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; }

fieldset { border: 0; padding: 0; margin: 0 0 18px; display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (max-width: 480px) { fieldset { grid-template-columns: 1fr; } }
legend { font-weight: 700; margin-bottom: 8px; padding: 0; }

label { display: flex; flex-direction: column; gap: 4px; font-size: .9rem; color: var(--muted); }
label small { font-size: .78rem; }
input, select {
  font: inherit; color: var(--text); background: var(--bg);
  border: 1px solid var(--border); border-radius: 8px; padding: 9px 10px; width: 100%;
}
input:focus, select:focus { outline: 2px solid var(--accent); outline-offset: 1px; }

.results { position: sticky; top: 16px; }
@media (max-width: 820px) { .results { position: static; } }
.results h2 { margin: 0 0 12px; }
.results h3 { font-size: 1rem; margin: 20px 0 6px; }

.headline { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 12px; margin-bottom: 12px; }
.headline > div { background: var(--bg); border-radius: 8px; padding: 12px; }
.label { display: block; color: var(--muted); font-size: .85rem; }
.big { font-size: clamp(1.15rem, 5vw, 1.6rem); color: var(--pos); font-variant-numeric: tabular-nums; overflow-wrap: anywhere; }

.breakdown { width: 100%; border-collapse: collapse; font-size: .95rem; }
.breakdown th { text-align: left; font-weight: 400; color: var(--muted); padding: 6px 0; }
.breakdown td { text-align: right; font-variant-numeric: tabular-nums; padding: 6px 0; white-space: nowrap; }
.breakdown tr + tr { border-top: 1px solid var(--border); }
.breakdown .total th, .breakdown .total td { font-weight: 700; color: var(--text); }

.neg, .big.neg { color: var(--neg); }

.note { color: var(--muted); font-size: .82rem; margin: 0; }

.guide { margin: 36px 0; max-width: 75ch; }
.guide li { margin-bottom: 6px; }

.site-footer { border-top: 1px solid var(--border); color: var(--muted); font-size: .85rem; padding: 18px 0; }

/* Gezinme, SSS ve araç sayfaları */
.site-nav { display: flex; flex-wrap: wrap; gap: 4px 14px; width: 100%; font-size: .9rem; }
.site-nav a { color: var(--muted); text-decoration: none; padding: 2px 0; }
.site-nav a:hover { color: var(--text); }
.site-nav a[aria-current="page"] { color: var(--accent); font-weight: 600; }

.updated { font-size: .8rem; color: var(--muted); margin: -16px 0 24px; }

a { color: var(--accent); }

.big.plain { color: var(--text); }

.compare th:not(:first-child) { text-align: right; font-weight: 600; color: var(--text); }
.compare thead th { padding-bottom: 6px; font-size: .85rem; }
.compare td { padding-left: 10px; }

.link-list { list-style: none; padding: 0; display: flex; flex-wrap: wrap; gap: 8px; }
.link-list a { display: inline-block; border: 1px solid var(--border); border-radius: 999px; padding: 6px 12px; text-decoration: none; background: var(--surface); }

.faq { margin: 36px 0; max-width: 75ch; }
.faq details { background: var(--surface); border: 1px solid var(--border); border-radius: 8px; padding: 12px 14px; margin-bottom: 8px; }
.faq summary { cursor: pointer; font-weight: 600; }
.faq details p { margin: 8px 0 0; color: var(--muted); }
.big.plain.neg { color: var(--neg); }
label.check { flex-direction: row; align-items: flex-start; gap: 8px; grid-column: 1 / -1; color: var(--text); }
label.check input { width: auto; margin-top: 3px; }
label.check small { display: block; color: var(--muted); }

/* Komisyon tarifesi kartları */
.summary { margin: 0 0 12px; }
.options { display: grid; gap: 10px; }
.option { border: 1px solid var(--border); border-radius: 8px; padding: 12px 14px; background: var(--bg); }
.option.best { border-color: var(--pos); box-shadow: inset 0 0 0 1px var(--pos); }
.option h3 { margin: 0 0 6px; font-size: 1rem; }
.option.best h3 { color: var(--pos); }
.option dl { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 4px 12px; margin: 0; font-size: .92rem; }
.option dt { color: var(--muted); }
.option dd { margin: 0; text-align: right; font-variant-numeric: tabular-nums; }

/* Tarife bantları */
fieldset.bands { display: block; }
.band-row { display: grid; grid-template-columns: 64px repeat(3, minmax(0, 1fr)); gap: 8px; align-items: end; margin-bottom: 10px; }
.band-name { font-weight: 600; padding-bottom: 10px; }
.band-row label { font-size: .8rem; }
.band-row input[disabled] { color: var(--muted); }
@media (max-width: 480px) { .band-row { grid-template-columns: repeat(3, minmax(0, 1fr)); } .band-name { grid-column: 1 / -1; padding-bottom: 0; } }
.note.warn { color: var(--neg); }
.band-range { margin: -2px 0 8px; color: var(--muted); font-size: .85rem; }
.option.baseline { border-style: dashed; }

/* Toplu Excel analizi */
.layout.bulk { grid-template-columns: minmax(0, 1fr) minmax(0, 1.6fr); }
@media (max-width: 960px) { .layout.bulk { grid-template-columns: minmax(0, 1fr); } .layout.bulk .results { position: static; } }
.drop { grid-column: 1 / -1; border: 2px dashed var(--border); border-radius: 10px; padding: 18px; text-align: center; cursor: pointer; color: var(--text); background: var(--bg); }
.drop.over, .drop:hover { border-color: var(--accent); }
.drop input { position: absolute; width: 1px; height: 1px; opacity: 0; }
.drop:focus-within { outline: 2px solid var(--accent); outline-offset: 2px; }
.drop small { display: block; color: var(--muted); margin-top: 4px; }
#fileStatus { grid-column: 1 / -1; }
.actions { display: flex; flex-wrap: wrap; gap: 8px; align-items: end; margin: 12px 0; }
button { font: inherit; border: 0; border-radius: 8px; padding: 9px 14px; background: var(--accent); color: #fff; cursor: pointer; }
button.secondary { background: transparent; color: var(--muted); border: 1px solid var(--border); }
button:disabled { opacity: .45; cursor: not-allowed; }
label.inline { flex-direction: row; align-items: center; gap: 8px; }
label.inline select { width: auto; }
.table-scroll { overflow-x: auto; margin: 0 -4px; }
.bulk-table { width: 100%; border-collapse: collapse; font-size: .88rem; min-width: 560px; }
.bulk-table th { text-align: left; color: var(--muted); font-weight: 600; padding: 6px; border-bottom: 1px solid var(--border); }
.bulk-table td { padding: 8px 6px; border-bottom: 1px solid var(--border); vertical-align: top; }
.bulk-table td.num { text-align: right; white-space: nowrap; }
.bulk-table .muted { color: var(--muted); font-size: .8rem; }
.bulk-table .pos { color: var(--pos); font-weight: 600; }
.bulk-table .neg { color: var(--neg); }
.guide ol li { margin-bottom: 6px; }
@media (max-width: 600px) {
  .bulk-table { min-width: 0; }
  .bulk-table thead { display: none; }
  .bulk-table tr { display: block; border-bottom: 1px solid var(--border); padding: 8px 0; }
  .bulk-table td { display: grid; grid-template-columns: 96px minmax(0, 1fr); gap: 8px; border: 0; padding: 3px 0; }
  .bulk-table td.num { text-align: left; white-space: normal; }
  .bulk-table td::before { content: attr(data-label); color: var(--muted); font-size: .8rem; }
  .bulk-table td[data-label=""]::before { content: none; }
}
.bulk-table td > div { overflow-wrap: anywhere; min-width: 0; }

/* Yükleme adımları */
.progress { grid-column: 1 / -1; background: var(--bg); border: 1px solid var(--border); border-radius: 10px; padding: 10px 14px; }
.progress ol { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; font-size: .9rem; color: var(--muted); }
.progress li { display: flex; align-items: center; gap: 8px; }
.progress li::before { content: ''; width: 14px; height: 14px; border-radius: 50%; border: 2px solid var(--border); flex: none; }
.progress li.active { color: var(--text); font-weight: 600; }
.progress li.active::before { border-color: var(--accent); border-right-color: transparent; animation: spin .8s linear infinite; }
.progress li.done { color: var(--text); }
.progress li.done::before { content: '✓'; border-color: var(--pos); color: var(--pos); font-size: 10px; line-height: 10px; text-align: center; }
@keyframes spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) { .progress li.active::before { animation: none; } }
.drop.busy { opacity: .6; pointer-events: none; }

/* Açıklama + SSS: geniş ekranda iki sütun */
.below { display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr); gap: 32px; align-items: start; margin: 36px 0; }
.below .guide, .below .faq { margin: 0 0 24px; max-width: none; }
.below-side { position: sticky; top: 16px; }
@media (max-width: 900px) { .below { grid-template-columns: minmax(0, 1fr); gap: 0; } .below-side { position: static; } }

/* Sonuç başlığı + yazdır */
.results-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 12px; }
.results-head h2 { margin: 0; }
.results-head button { padding: 6px 12px; font-size: .85rem; }

/* Yazdırma / PDF: form yerine girilen değerlerin özeti + sonuç; tek sütun, A4 */
.print-only { display: none; }
@media print {
  @page { size: A4; margin: 12mm; }
  :root { --bg: #fff; --surface: #fff; --text: #000; --muted: #444; --border: #ccc; --accent: #c2410c; --pos: #166534; --neg: #b91c1c; }
  body { background: #fff; color: #000; font-size: 10pt; line-height: 1.35; }
  .site-nav, .tagline, .below, .guide, .faq, .footer-links, button, .actions, .drop, .sample-row, #progress,
  main form.card, .intro > p, .note.warn:not(.fx-note), .results .note { display: none !important; }
  [hidden] { display: none !important; }
  .print-only { display: block; margin-bottom: 8px; }
  .site-header .wrap { padding-block: 0 6px; }
  .intro h1 { font-size: 16pt; margin: 6px 0 8px; }
  .layout, .layout.bulk { display: block; }
  .card, .results { position: static; border: 0; padding: 0; break-inside: auto; }
  h2 { font-size: 12pt; margin: 8px 0 4px; }
  .results h3 { font-size: 10.5pt; margin: 8px 0 2px; }
  .headline { gap: 8px; margin-bottom: 6px; }
  .headline > div { padding: 6px 8px; border: 1px solid #ccc; }
  .big { font-size: 14pt; }
  .breakdown { font-size: 9.5pt; }
  .breakdown th, .breakdown td { padding: 2px 0; }
  .print-inputs tbody { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); column-gap: 18px; }
  .print-inputs tr { display: flex; justify-content: space-between; gap: 8px; border-top: 1px solid #ddd; }
  .print-inputs th, .print-inputs td { padding: 1px 0; }
  .options { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 6px; }
  .option { padding: 6px 8px; }
  .option dl { font-size: 9pt; }
  .option, tr { break-inside: avoid; }
  .site-footer { border: 0; padding: 6px 0 0; font-size: 8pt; }
  .site-footer p { margin: 0; }
}
.sample-row { grid-column: 1 / -1; margin: 0; font-size: .9rem; color: var(--muted); display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.sample-row button { padding: 6px 12px; font-size: .85rem; }

.fx-note { grid-column: 1 / -1; margin: 0; }

/* Çok geniş ekran: form alanları üç sütun, sonuç kartı biraz daha dar */
@media (min-width: 1500px) {
  .layout { grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); }
  form.card fieldset { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  form.card fieldset.bands { display: block; }
  .layout.bulk form.card fieldset { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}