:root {
  color-scheme: light;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
  background: #f4f2ed;
  color: #1f2528;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 15% 20%, rgba(255,255,255,.95), transparent 35%),
    linear-gradient(145deg, #f7f5f0 0%, #ebe7df 100%);
}

button, input { font: inherit; }

.shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 28px 18px;
}

.card {
  width: min(100%, 560px);
  padding: clamp(28px, 6vw, 52px);
  background: rgba(255, 255, 255, .92);
  border: 1px solid rgba(31, 37, 40, .10);
  border-radius: 24px;
  box-shadow: 0 24px 70px rgba(37, 43, 46, .12);
}

.brand {
  width: 52px;
  height: 52px;
  display: grid;
  place-items: center;
  margin-bottom: 26px;
  border-radius: 16px;
  background: #1f2528;
  color: #fff;
  font-size: 25px;
  font-weight: 700;
  letter-spacing: -.04em;
}

.eyebrow {
  margin: 0 0 12px;
  color: #6d7477;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .16em;
}

h1 {
  margin: 0;
  font-size: clamp(30px, 7vw, 44px);
  line-height: 1.1;
  letter-spacing: -.035em;
}

.lead {
  margin: 20px 0 0;
  font-size: 17px;
  line-height: 1.75;
}

.secondary {
  margin: 10px 0 0;
  color: #6d7477;
  font-size: 14px;
  line-height: 1.65;
}

.status {
  margin-top: 28px;
  padding: 16px 18px;
  border-radius: 14px;
  background: #f2f4f3;
  color: #374044;
  line-height: 1.6;
}

.status[data-tone="working"] { background: #eef3f7; }
.status[data-tone="success"] { background: #e8f5ec; color: #1d5a31; }
.status[data-tone="error"] { background: #faece9; color: #7b2d22; }

.spinner {
  display: inline-block;
  width: 18px;
  height: 18px;
  margin-right: 9px;
  vertical-align: -3px;
  border: 2px solid rgba(55, 64, 68, .22);
  border-top-color: currentColor;
  border-radius: 50%;
  animation: spin .8s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

.form {
  display: grid;
  gap: 18px;
  margin-top: 28px;
}

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

label { font-size: 14px; font-weight: 650; }

input {
  width: 100%;
  padding: 13px 14px;
  border: 1px solid #cfd4d3;
  border-radius: 12px;
  background: #fff;
  color: #1f2528;
  outline: none;
}

input:focus {
  border-color: #46545a;
  box-shadow: 0 0 0 4px rgba(70, 84, 90, .10);
}

.hint {
  margin: -6px 0 0;
  color: #6d7477;
  font-size: 13px;
  line-height: 1.5;
}

.primary-button {
  min-height: 48px;
  padding: 12px 18px;
  border: 0;
  border-radius: 12px;
  background: #1f2528;
  color: #fff;
  cursor: pointer;
  font-weight: 700;
}

.primary-button:hover { background: #30383c; }
.primary-button:disabled { opacity: .55; cursor: wait; }

[hidden] { display: none !important; }

@media (prefers-reduced-motion: reduce) {
  .spinner { animation: none; }
}