:root {
  color-scheme: dark;
  font-family: Inter, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: #06131e;
  color: #e8f4f5;
}

* { box-sizing: border-box; }

body {
  min-height: 100vh;
  margin: 0;
  background:
    radial-gradient(circle at 18% 15%, rgba(26, 96, 112, .32), transparent 34rem),
    radial-gradient(circle at 86% 80%, rgba(34, 82, 82, .24), transparent 30rem),
    linear-gradient(135deg, #06131e 0%, #091d2a 54%, #06131e 100%);
}

.landing-shell {
  width: min(1080px, calc(100% - 40px));
  min-height: 100vh;
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 390px;
  align-items: center;
  gap: 88px;
  padding: 64px 0;
}

.landing-copy { max-width: 610px; }
.eyebrow { margin: 0 0 16px; color: #65d0e8; font-size: 12px; letter-spacing: .18em; }
h1 { max-width: 580px; margin: 0; font-size: clamp(38px, 6vw, 72px); line-height: 1.06; letter-spacing: -.04em; }
.lead { max-width: 520px; margin: 28px 0 0; color: #a7c3ca; font-size: 18px; line-height: 1.8; }
.promise-list { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 34px; }
.promise-list span { padding: 8px 12px; border: 1px solid rgba(101, 208, 232, .28); border-radius: 999px; color: #b9dce2; font-size: 13px; }

.auth-card { padding: 34px; border: 1px solid rgba(101, 208, 232, .24); border-radius: 22px; background: rgba(6, 24, 35, .86); box-shadow: 0 24px 80px rgba(0, 0, 0, .3); backdrop-filter: blur(18px); }
.card-mark { width: 46px; height: 46px; display: grid; place-items: center; margin-bottom: 24px; border-radius: 14px; background: #1d7590; color: #fff; font-size: 24px; font-weight: 800; }
h2 { margin: 0; font-size: 28px; }
.hint, .privacy-note { color: #86aab7; font-size: 13px; line-height: 1.7; }
.tabs { display: flex; gap: 20px; margin: 26px 0 20px; border-bottom: 1px solid rgba(134, 170, 183, .2); }
.tab { padding: 0 0 12px; border: 0; background: none; color: #86aab7; cursor: pointer; font-size: 15px; }
.tab.active { color: #65d0e8; border-bottom: 2px solid #65d0e8; }
.auth-form { display: grid; gap: 14px; }
.auth-form label { display: grid; gap: 7px; color: #b9dce2; font-size: 13px; }
.auth-form input { width: 100%; padding: 12px 13px; border: 1px solid rgba(134, 170, 183, .3); border-radius: 10px; outline: none; background: rgba(1, 12, 20, .7); color: #f4ffff; font: inherit; }
.auth-form input:focus { border-color: #65d0e8; box-shadow: 0 0 0 3px rgba(101, 208, 232, .12); }
button.primary { padding: 12px 16px; border: 0; border-radius: 10px; background: #1d7590; color: #fff; cursor: pointer; font: inherit; font-weight: 700; }
button.primary:hover { background: #258aa4; }
.message { min-height: 22px; margin: 16px 0 0; color: #f0c878; font-size: 13px; line-height: 1.6; }
.message.success { color: #8de0b4; }
.hidden { display: none !important; }

@media (max-width: 820px) {
  .landing-shell { grid-template-columns: 1fr; gap: 42px; padding: 42px 0; }
  .landing-copy { max-width: none; }
  .auth-card { max-width: 520px; width: 100%; }
}