:root {
  --bg: #0e1411;
  --panel: #151d18;
  --text: #e9efe9;
  --dim: #a7b4ab;
  --green: #1e9e5a;
  --red: #d2263b;
  --line: #26332b;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
main { max-width: 760px; margin: 0 auto; padding: 32px 16px 64px; }
header { display: flex; align-items: center; gap: 14px; margin-bottom: 24px; }
.flag { width: 44px; height: 30px; border-radius: 4px; background: linear-gradient(90deg, var(--green) 50%, #fff 50%); position: relative; flex: none; }
.flag::after { content: ""; position: absolute; left: 50%; top: 50%; width: 12px; height: 12px; margin: -6px 0 0 -6px; border-radius: 50%; border: 3px solid var(--red); border-right-color: transparent; }
h1 { font-size: 1.6rem; margin: 0; line-height: 1.2; }
h2 { font-size: 1.15rem; margin: 28px 0 8px; color: #fff; }
p, li { color: var(--dim); }
strong { color: var(--text); }
a { color: #5fd394; }
nav { display: flex; flex-wrap: wrap; gap: 8px 18px; margin: 8px 0 24px; font-size: .95rem; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 18px; margin: 18px 0; }
.lang { font-size: .8rem; text-transform: uppercase; letter-spacing: .1em; color: var(--green); margin-top: 32px; }
label { display: block; margin: 12px 0 4px; color: var(--text); font-weight: 600; }
input { width: 100%; padding: 12px; border-radius: 8px; border: 1px solid var(--line); background: #0b100d; color: var(--text); font-size: 1rem; }
button { margin-top: 18px; width: 100%; padding: 14px; border: 0; border-radius: 10px; background: var(--red); color: #fff; font-size: 1rem; font-weight: 700; cursor: pointer; }
button:disabled { opacity: .5; }
#result { margin-top: 14px; font-weight: 600; }
.ok { color: #5fd394; }
.err { color: #ff7b88; }
footer { margin-top: 48px; font-size: .85rem; color: var(--dim); border-top: 1px solid var(--line); padding-top: 16px; }