:root {
  --bg: #f4f6fb;
  --card: #ffffff;
  --text: #1b2230;
  --muted: #667085;
  --line: #dde2ec;
  --accent: #2f5bea;
  --accent-text: #ffffff;
  --ok-bg: #e7f6ec;
  --ok-text: #1e6b3a;
  --err-bg: #fdecec;
  --err-text: #a12626;
  --danger: #c0392b;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f131b;
    --card: #171c27;
    --text: #e6e9f0;
    --muted: #98a2b3;
    --line: #2a3140;
    --accent: #6d8dff;
    --accent-text: #0f131b;
    --ok-bg: #173323;
    --ok-text: #8fe0a9;
    --err-bg: #3a1a1a;
    --err-text: #ffb3b3;
    --danger: #ff7b6b;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0; min-height: 100vh; display: flex; flex-direction: column; align-items: center;
  background: var(--bg); color: var(--text);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
html[lang="fa"] body { font-family: Vazirmatn, "Segoe UI", Tahoma, sans-serif; }
.top {
  width: 100%; max-width: 720px; display: flex; justify-content: space-between; align-items: center;
  gap: 12px; padding: 16px; flex-wrap: wrap;
}
.brand { display: flex; align-items: center; gap: 8px; font-weight: 700; color: var(--text); text-decoration: none; }
.langs { display: flex; gap: 12px; font-size: 14px; }
.langs a { color: var(--muted); text-decoration: none; }
.langs a[aria-current] { color: var(--accent); font-weight: 600; }
.card {
  width: calc(100% - 32px); max-width: 420px; background: var(--card); border: 1px solid var(--line);
  border-radius: 16px; padding: 28px 24px; margin: 8px 16px 24px;
}
.card.wide { max-width: 640px; }
h1 { font-size: 24px; margin: 0 0 12px; }
h2 { font-size: 17px; margin: 0 0 10px; }
.lead { color: var(--muted); margin: 0 0 20px; }
.muted { color: var(--muted); }
section { border-top: 1px solid var(--line); padding-top: 18px; margin-top: 18px; }
label { display: block; margin: 0 0 14px; font-size: 14px; font-weight: 600; }
label small { display: block; font-weight: 400; color: var(--muted); margin-top: 4px; }
input, select {
  display: block; width: 100%; margin-top: 6px; padding: 10px 12px; font: inherit; color: var(--text);
  background: var(--bg); border: 1px solid var(--line); border-radius: 10px;
}
input:focus, select:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
button, .button {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px; width: 100%;
  padding: 11px 16px; margin: 4px 0; font: inherit; font-weight: 600; text-decoration: none; cursor: pointer;
  background: var(--accent); color: var(--accent-text); border: 1px solid var(--accent); border-radius: 10px;
}
button.secondary, .button.secondary { background: transparent; color: var(--accent); }
.button.google { background: var(--card); color: var(--text); border-color: var(--line); }
button.small { width: auto; padding: 6px 12px; font-size: 14px; margin: 0; }
button.danger { background: var(--danger); border-color: var(--danger); color: #fff; }
.divider { display: flex; align-items: center; gap: 10px; color: var(--muted); font-size: 14px; margin: 14px 0; }
.divider::before, .divider::after { content: ""; flex: 1; border-top: 1px solid var(--line); }
.links { font-size: 14px; margin: 12px 0 0; }
a { color: var(--accent); }
.alert { padding: 10px 12px; border-radius: 10px; font-size: 14px; margin: 0 0 16px; }
.alert.ok { background: var(--ok-bg); color: var(--ok-text); }
.alert.error { background: var(--err-bg); color: var(--err-text); }
.row { display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.row h1 { margin: 0; }
ul.plain { list-style: none; padding: 0; margin: 0; }
ul.plain li { padding: 4px 0; }
ul.sessions { list-style: none; padding: 0; margin: 0; }
ul.sessions li {
  display: flex; flex-wrap: wrap; align-items: center; gap: 8px 12px; padding: 10px 0;
  border-bottom: 1px solid var(--line);
}
ul.sessions li span { flex: 1 1 200px; overflow-wrap: anywhere; font-size: 14px; }
ul.sessions form { margin: 0; }
.foot { color: var(--muted); font-size: 13px; padding: 0 16px 24px; }
.foot a { color: var(--muted); }