:root {
  color-scheme: dark;
  --bg: #03080f;
  --panel: #0c141f;
  --panel-soft: #101b29;
  --line: #243447;
  --text: #edf6ff;
  --muted: #9bb2c8;
  --cyan: #32d4b5;
  --blue: #2e9df2;
  --danger: #ff6680;
}
* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; background: var(--bg); color: var(--text); font-family: "Microsoft YaHei", system-ui, sans-serif; }
.activation-shell { min-height: 100vh; display: grid; place-items: center; padding: 48px; }
.activation-panel { width: min(980px, 100%); border: 1px solid var(--line); border-radius: 12px; background: linear-gradient(180deg, var(--panel), #08111b); padding: 62px 68px; box-shadow: 0 26px 80px rgba(0, 0, 0, .38); }
.signal { display: flex; gap: 10px; margin-bottom: 38px; }
.signal span { width: 12px; height: 12px; border-radius: 50%; background: var(--cyan); opacity: .38; }
.signal span:first-child { opacity: 1; }
.eyebrow { margin: 0 0 18px; color: var(--cyan); font-size: 18px; font-weight: 800; letter-spacing: 0; }
h1 { margin: 0; font-size: clamp(52px, 7vw, 92px); line-height: 1.05; letter-spacing: 0; }
.lead { max-width: 860px; margin: 34px 0 54px; color: var(--muted); font-size: 25px; line-height: 1.8; }
label { display: block; margin-bottom: 14px; font-size: 24px; font-weight: 800; }
.input-row { display: grid; grid-template-columns: 1fr 210px; gap: 18px; }
input { width: 100%; height: 68px; border: 1px solid #38516a; border-radius: 8px; background: #050c14; color: var(--text); padding: 0 22px; font-size: 24px; outline: none; }
input:focus { border-color: var(--blue); box-shadow: 0 0 0 3px rgba(46, 157, 242, .16); }
button { height: 68px; border: 0; border-radius: 8px; background: linear-gradient(135deg, var(--cyan), #35c9aa); color: #021018; font-size: 24px; font-weight: 900; cursor: pointer; }
button:disabled { opacity: .65; cursor: wait; }
.meta { display: flex; justify-content: space-between; gap: 20px; margin-top: 34px; padding-top: 28px; border-top: 1px solid var(--line); color: var(--muted); font-size: 20px; }
.meta strong { color: var(--text); }
.message { min-height: 32px; margin: 26px 0 0; color: var(--danger); font-size: 24px; font-weight: 700; }
.message.success { color: var(--cyan); }
@media (max-width: 760px) {
  .activation-shell { padding: 22px; }
  .activation-panel { padding: 36px 24px; }
  .input-row { grid-template-columns: 1fr; }
  .lead { font-size: 18px; }
}