:root {
  --bg: #0b1220;
  --card: #121a2b;
  --text: #e9eefc;
  --muted: #a9b2c7;
  --primary: #5b8cff;
  --primary-2: #3b6ff2;
  --border: rgba(255, 255, 255, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial,
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: radial-gradient(1200px 800px at 10% 10%, #162446, var(--bg));
  color: var(--text);
}

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 20px 14px 40px;
}

.header h1 {
  margin: 8px 0 4px;
  font-size: 28px;
}

.card {
  background: rgba(18, 26, 43, 0.9);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
  margin-top: 14px;
}

.hidden {
  display: none !important;
}

.muted {
  color: var(--muted);
}
.small {
  font-size: 12px;
}

.q-text {
  font-size: 20px;
  line-height: 1.5;
  margin: 14px 0 12px;
}

.options {
  display: grid;
  gap: 10px;
  margin-top: 12px;
}

.opt {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 12px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.03);
}
.opt input {
  transform: scale(1.2);
}

.nav {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  margin-top: 14px;
}

.btn {
  appearance: none;
  border: 0;
  border-radius: 12px;
  padding: 12px 14px;
  background: linear-gradient(180deg, var(--primary), var(--primary-2));
  color: #fff;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  text-align: center;
  flex: 1;
}

.btn.ghost {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
}

.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.row {
  display: flex;
  align-items: center;
  gap: 12px;
}
.gap {
  margin-top: 12px;
}

.label {
  display: grid;
  gap: 6px;
  margin-top: 10px;
}
input[type="email"] {
  width: 100%;
  padding: 12px 12px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: rgba(0, 0, 0, 0.2);
  color: var(--text);
  outline: none;
}

.progress {
  height: 8px;
  background: rgba(255, 255, 255, 0.07);
  border-radius: 999px;
  overflow: hidden;
}
.progress-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, #7aa3ff, var(--primary));
}

.spinner {
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255, 255, 255, 0.2);
  border-top-color: var(--primary);
  border-radius: 999px;
  animation: spin 0.8s linear infinite;
}
@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.title {
  font-weight: 700;
}

.result-type {
  font-size: 36px;
  font-weight: 800;
  letter-spacing: 1px;
  margin: 10px 0 6px;
}

.kv {
  margin-top: 10px;
  display: grid;
  gap: 10px;
}
.kv .item {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px 12px;
  background: rgba(255, 255, 255, 0.03);
}

.footer {
  margin-top: 18px;
}