@font-face {
  font-family: "Vazirmatn";
  src: url("fonts/Vazirmatn[wght].woff2") format("woff2");
  font-weight: 100 900;
  font-display: swap;
}

:root {
  --bg: #f5f7fb;
  --surface: #ffffff;
  --text: #111827;
  --muted: #5b6474;
  --border: #dde2ea;
  --accent: #2563eb;
  --accent-text: #ffffff;
  --accent-soft: #e6eefe;
  --field: #f9fafc;
  --radius: 12px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f1420;
    --surface: #171e2d;
    --text: #e8ecf4;
    --muted: #9aa4b6;
    --border: #2a3448;
    --accent: #5b8cff;
    --accent-text: #0b1020;
    --accent-soft: #1f2b47;
    --field: #121827;
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --bg: #0f1420;
  --surface: #171e2d;
  --text: #e8ecf4;
  --muted: #9aa4b6;
  --border: #2a3448;
  --accent: #5b8cff;
  --accent-text: #0b1020;
  --accent-soft: #1f2b47;
  --field: #121827;
  color-scheme: dark;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  line-height: 1.6;
}

:root[lang="fa"] body { font-family: "Vazirmatn", system-ui, sans-serif; }

/* Persian text always gets Vazirmatn, whatever the interface language. */
textarea, output { font-family: "Vazirmatn", system-ui, sans-serif; }

.page {
  max-width: 960px;
  margin: 0 auto;
  padding: 32px 16px 48px;
}

.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-block-end: 24px;
}

.brand { display: flex; align-items: center; gap: 14px; }
.brand img { border-radius: 10px; flex: none; }
h1 { margin: 0; font-size: 1.5rem; line-height: 1.2; }
.tagline { margin: 2px 0 0; color: var(--muted); }

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

.controls {
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  gap: 16px 24px;
  margin-block-end: 16px;
}

.segmented { border: 0; margin: 0; padding: 0; display: flex; flex-wrap: wrap; }
.segmented legend, .field > span { display: block; font-size: 0.85rem; color: var(--muted); margin-block-end: 4px; padding: 0; }
.segmented label { position: relative; }
.segmented input { position: absolute; opacity: 0; inset: 0; margin: 0; cursor: pointer; }
.segmented span {
  display: block;
  padding: 6px 14px;
  border: 1px solid var(--border);
  background: var(--field);
  cursor: pointer;
}
.segmented label:first-of-type span { border-start-start-radius: 8px; border-end-start-radius: 8px; }
.segmented label:last-of-type span { border-start-end-radius: 8px; border-end-end-radius: 8px; }
.segmented label + label span { margin-inline-start: -1px; }
.segmented input:checked + span { background: var(--accent-soft); border-color: var(--accent); color: var(--text); position: relative; }
.segmented input:focus-visible + span { outline: 2px solid var(--accent); outline-offset: 2px; }

select {
  font: inherit;
  color: var(--text);
  background: var(--field);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 10px;
}

.check { display: flex; align-items: center; gap: 8px; padding-block: 6px; cursor: pointer; }
.check input { width: 18px; height: 18px; accent-color: var(--accent); }

.panes { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.pane { display: flex; flex-direction: column; gap: 6px; min-width: 0; }
.pane-label { font-size: 0.85rem; color: var(--muted); }

textarea, output {
  display: block;
  width: 100%;
  min-height: 168px;
  padding: 12px 14px;
  font-size: 1.1rem;
  line-height: 1.8;
  color: var(--text);
  background: var(--field);
  border: 1px solid var(--border);
  border-radius: 10px;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}
textarea { resize: vertical; }
textarea:focus { outline: 2px solid var(--accent); outline-offset: 1px; border-color: transparent; }
output.placeholder { color: var(--muted); font-size: 1rem; }
.detected { margin: 0; min-height: 1.6em; font-size: 0.85rem; color: var(--muted); }

.actions, .links { display: flex; flex-wrap: wrap; gap: 10px; margin-block-start: 16px; }

button, .button {
  font: inherit;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 18px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--field);
  color: var(--text);
  text-decoration: none;
  cursor: pointer;
  min-height: 40px;
}
button:hover, .button:hover { border-color: var(--accent); }
button:focus-visible, .button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-text); }
.primary:hover { filter: brightness(1.08); }
.ghost { background: transparent; }

.app { margin-block-start: 20px; }
.app p { margin: 0; }

footer { margin-block-start: 24px; text-align: center; color: var(--muted); font-size: 0.9rem; }

@media (max-width: 680px) {
  .page { padding-block-start: 20px; }
  .panes { grid-template-columns: 1fr; }
  .top { align-items: flex-start; }
  textarea, output { min-height: 132px; }
}