:root {
  --bg: #f3efe7;
  --panel: rgba(255, 252, 247, 0.92);
  --ink: #1d2733;
  --muted: #677489;
  --line: rgba(30, 50, 90, 0.10);
  --primary: #1f5eff;
  --accent: #db5b45;
  --danger: #a22727;
  --shadow: 0 24px 48px rgba(40, 56, 89, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  color: var(--ink);
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(31, 94, 255, 0.14), transparent 30%),
    radial-gradient(circle at bottom right, rgba(219, 91, 69, 0.14), transparent 30%),
    linear-gradient(180deg, #faf7f1 0%, var(--bg) 100%);
}

.login-shell {
  width: min(100%, 520px);
  padding: 24px;
}

.login-panel {
  padding: 32px;
  border-radius: 28px;
  border: 1px solid rgba(255, 255, 255, 0.62);
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.90), rgba(250, 246, 238, 0.96)),
    var(--panel);
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px);
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--primary);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.login-copy h1 {
  margin: 0;
  font-size: clamp(28px, 5vw, 40px);
  line-height: 1.08;
}

.login-desc {
  margin: 14px 0 0;
  color: var(--muted);
  line-height: 1.7;
}

.login-error {
  margin-top: 18px;
  padding: 14px 16px;
  border-radius: 16px;
  border: 1px solid rgba(201, 63, 63, 0.20);
  background: rgba(201, 63, 63, 0.10);
  color: var(--danger);
}

.login-form {
  margin-top: 22px;
  display: grid;
  gap: 16px;
}

.field {
  display: grid;
  gap: 8px;
}

.field span {
  font-size: 14px;
  font-weight: 600;
}

.field input {
  width: 100%;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.84);
  color: var(--ink);
  font: inherit;
  outline: none;
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
}

.field input:focus {
  border-color: rgba(31, 94, 255, 0.45);
  box-shadow: 0 0 0 4px rgba(31, 94, 255, 0.10);
}

.submit-btn {
  margin-top: 4px;
  padding: 14px 18px;
  border: 0;
  border-radius: 16px;
  background: linear-gradient(135deg, var(--primary), #4579ff);
  color: white;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 14px 28px rgba(31, 94, 255, 0.22);
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.submit-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 16px 30px rgba(31, 94, 255, 0.24);
}

@media (max-width: 640px) {
  .login-shell {
    padding: 14px;
  }

  .login-panel {
    padding: 24px 18px;
    border-radius: 22px;
  }

  .login-copy h1 {
    font-size: clamp(24px, 8vw, 32px);
  }
}