:root {
  --bg: #0b0d12; --panel: #141821; --panel-2: #1b2130; --text: #eef1f7; --dim: #9aa3b5; --line: #262d3d;
  --accent: #ff5a5f; --accent-2: #ffb36b; --good: #3fb950; --radius: 16px;
  color-scheme: dark;
}
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) { --bg: #f6f7fb; --panel: #fff; --panel-2: #eef0f6; --text: #141821; --dim: #5d667a; --line: #dde1ea; color-scheme: light; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.55 "Inter", system-ui, -apple-system, "Segoe UI", sans-serif; }
a { color: inherit; }
.wrap { max-width: 1040px; margin: 0 auto; padding: 0 16px; }
header { display: flex; align-items: center; gap: 18px; padding: 18px 0; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 800; letter-spacing: 1px; text-decoration: none; }
.logo i { width: 30px; height: 30px; border-radius: 9px; background: linear-gradient(135deg, var(--accent), var(--accent-2)); display: inline-block; }
.logo sup { color: var(--accent); font-size: 11px; }
nav { margin-left: auto; display: flex; gap: 16px; flex-wrap: wrap; }
nav a { text-decoration: none; color: var(--dim); font-weight: 600; }
nav a:hover, nav a.on { color: var(--text); }
.lang { display: flex; gap: 6px; }
.lang a { text-decoration: none; font-size: 13px; color: var(--dim); padding: 2px 6px; border-radius: 6px; border: 1px solid var(--line); }
.lang a.on { color: var(--text); border-color: var(--accent); }
.hero { padding: 56px 0 32px; }
.hero h1 { font-size: clamp(30px, 5vw, 52px); line-height: 1.1; margin: 0 0 14px; letter-spacing: -1px; }
.hero p { color: var(--dim); font-size: 18px; max-width: 680px; }
.plans { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; margin: 26px 0; }
.plan { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; display: flex; flex-direction: column; gap: 8px; }
.plan.best { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent) inset; }
.plan h3 { margin: 0; font-size: 15px; text-transform: uppercase; letter-spacing: 2px; color: var(--dim); }
.plan .price { font-size: 38px; font-weight: 800; }
.plan small { color: var(--dim); }
.note { color: var(--dim); }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; margin: 18px 0; }
.btn { appearance: none; border: 0; border-radius: 12px; padding: 12px 18px; font: inherit; font-weight: 700; cursor: pointer;
       background: var(--panel-2); color: var(--text); text-decoration: none; display: inline-block; text-align: center; }
.btn.primary { background: linear-gradient(135deg, var(--accent), #ff7a59); color: #fff; }
.btn:disabled { opacity: .5; cursor: default; }
input { width: 100%; padding: 12px 14px; border-radius: 12px; border: 1px solid var(--line); background: var(--panel-2); color: var(--text); font: inherit; }
input.mono, .key { font-family: ui-monospace, "Cascadia Code", Consolas, monospace; letter-spacing: 1px; text-transform: uppercase; }
label { display: block; font-weight: 600; margin: 12px 0 6px; }
.key { font-size: clamp(20px, 4vw, 30px); font-weight: 800; padding: 14px; background: var(--panel-2); border-radius: 12px; text-align: center; word-break: break-all; }
.row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; margin-top: 12px; }
.msg { margin-top: 12px; font-weight: 600; }
.msg.ok { color: var(--good); }
.msg.err { color: var(--accent); }
.dev { display: flex; justify-content: space-between; gap: 10px; align-items: center; padding: 10px 0; border-top: 1px solid var(--line); }
.dev b { display: block; }
.dev small { color: var(--dim); }
footer { color: var(--dim); font-size: 14px; padding: 40px 0; display: flex; gap: 16px; flex-wrap: wrap; }
.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 14px; margin: 20px 0 10px; }
.features div { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; color: var(--dim); }
.features b { color: var(--text); display: block; margin-bottom: 4px; }