:root {
  --bg: #0c1116;
  --panel: #121b22;
  --edge: #1d6f7c;
  --text: #d8f1f7;
  --dim: #8aa3ab;
  --accent: #5ae1ff;
  --go: #2e8a52;
  --go-hover: #38a864;
  --warn: #ffc35a;
  --field: #1c242e;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.55 "Segoe UI", system-ui, -apple-system, Roboto, sans-serif;
}
a { color: var(--accent); }
.wrap { max-width: 520px; margin: 0 auto; padding: 0 16px; }
header { padding: 28px 0 8px; }
header a.home { color: var(--text); text-decoration: none; font-size: 22px; font-weight: 700; letter-spacing: 1.5px; }
h1 { font-size: 26px; margin: 24px 0 6px; color: var(--accent); }
p.lead { margin: 0 0 20px; color: var(--dim); }

.panel { background: var(--panel); border: 1px solid #1a2a33; border-left: 3px solid var(--edge); border-radius: 6px; padding: 18px 18px 20px; }
.tabs { display: flex; gap: 6px; margin-bottom: 16px; }
.tabs button {
  flex: 1; padding: 9px 10px; border-radius: 5px; border: 1px solid #22343e;
  background: transparent; color: var(--dim); font: inherit; cursor: pointer;
}
.tabs button[aria-selected="true"] { background: var(--field); color: var(--text); border-color: var(--edge); }

label { display: block; color: var(--dim); font-size: 14px; margin: 10px 0 4px; }
input {
  width: 100%; padding: 10px 12px; border-radius: 5px;
  border: 1px solid #2a3a44; background: var(--field); color: var(--text); font: inherit;
}
input:focus { outline: 2px solid var(--edge); outline-offset: 0; }
.hint { color: var(--dim); font-size: 13px; margin-top: 6px; }
.go {
  margin-top: 16px; width: 100%; padding: 12px 16px; border-radius: 6px;
  background: var(--go); color: #fff; border: 1px solid #6fd39a;
  font: inherit; font-size: 18px; font-weight: 700; cursor: pointer;
}
.go:hover { background: var(--go-hover); }
.go:disabled { opacity: .6; cursor: default; }
.plain {
  padding: 9px 14px; border-radius: 5px; border: 1px solid #2a3a44;
  background: var(--field); color: var(--text); font: inherit; cursor: pointer;
}
.message { min-height: 22px; margin-top: 12px; font-size: 15px; }
.message.error { color: var(--warn); }
.message.ok { color: #6edc8c; }
.who { font-size: 20px; margin: 0 0 4px; }
.who b { color: var(--accent); }
.row { display: flex; gap: 10px; align-items: center; justify-content: space-between; flex-wrap: wrap; }
hr { border: 0; border-top: 1px solid #1a2a33; margin: 18px 0; }
.note { margin-top: 18px; color: var(--dim); font-size: 14px; }
[hidden] { display: none !important; }
footer { margin-top: 40px; padding: 20px 0 36px; border-top: 1px solid #16232b; color: var(--dim); font-size: 14px; }