:root {
  color-scheme: dark;
  font-family: "Yu Gothic", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  background: #0d0925;
}

* { box-sizing: border-box; }

html, body { min-height: 100%; margin: 0; }

body {
  min-height: 100svh;
  background:
    radial-gradient(circle at 20% 15%, rgba(62, 212, 255, 0.35), transparent 34rem),
    radial-gradient(circle at 82% 78%, rgba(255, 75, 156, 0.3), transparent 30rem),
    linear-gradient(145deg, #15103a, #09071c);
}

.login-shell {
  min-height: 100svh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.login-card {
  width: min(100%, 460px);
  padding: clamp(30px, 6vw, 54px);
  border: 2px solid rgba(112, 239, 208, 0.72);
  border-radius: 28px;
  background: linear-gradient(160deg, rgba(30, 25, 70, 0.96), rgba(13, 10, 38, 0.96));
  box-shadow: 0 30px 90px rgba(0, 0, 0, 0.5), 0 0 42px rgba(112, 239, 208, 0.12);
  text-align: center;
}

.eyebrow {
  margin: 0 0 12px;
  color: #70efd0;
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0.22em;
}

h1 { margin: 0; color: #ffdc4f; font-size: clamp(32px, 8vw, 46px); }
.lead { margin: 14px 0 30px; color: #d9d5eb; }

form { display: grid; gap: 14px; }
label { text-align: left; color: #f7f3ff; font-weight: 800; }

input {
  width: 100%;
  padding: 18px 20px;
  border: 2px solid rgba(255, 255, 255, 0.24);
  border-radius: 15px;
  background: rgba(7, 6, 25, 0.82);
  color: #fff;
  font: 900 24px/1 monospace;
  letter-spacing: 0.2em;
  text-align: center;
  outline: none;
}

input:focus { border-color: #70efd0; box-shadow: 0 0 0 4px rgba(112, 239, 208, 0.14); }

button {
  min-height: 58px;
  border: 2px solid #fff;
  border-radius: 16px;
  background: linear-gradient(135deg, #ff4d8d, #d73e91);
  color: #fff;
  font: 900 19px/1 "Yu Gothic", sans-serif;
  cursor: pointer;
  box-shadow: 0 10px 28px rgba(255, 77, 141, 0.25);
}

button:hover { filter: brightness(1.08); transform: translateY(-1px); }
button:disabled { cursor: wait; filter: grayscale(0.4); opacity: 0.72; }

.status { min-height: 1.4em; margin: 0; color: #ff9fbd; font-weight: 800; }
.status.success { color: #70efd0; }
.note { margin: 18px 0 0; color: #8f88ad; font-size: 12px; line-height: 1.7; }