:root {
  --bg0: #e8eef4;
  --bg1: #f5f7fa;
  --ink: #1a2332;
  --muted: #5a6a7a;
  --accent: #1e5a8a;
  --accent-hover: #16466c;
  --line: #c5d0dc;
  --panel: rgba(255, 255, 255, 0.92);
  --err: #b42318;
  --ok: #0f5132;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(ellipse 80% 50% at 10% 0%, #c9dae8 0%, transparent 55%),
    radial-gradient(ellipse 70% 45% at 90% 10%, #d4e2ec 0%, transparent 50%),
    linear-gradient(165deg, var(--bg0), var(--bg1) 60%, #eef2f6);
}

.page {
  max-width: 440px;
  margin: 0 auto;
  padding: 48px 20px 64px;
}

.header {
  margin-bottom: 28px;
}

.brand {
  margin: 0 0 8px;
  font-size: 13px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 600;
}

.header h1 {
  margin: 0 0 8px;
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.sub {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.5;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 28px 24px;
  backdrop-filter: blur(8px);
  box-shadow: 0 12px 40px rgba(30, 50, 80, 0.08);
}

form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.875rem;
  color: var(--muted);
}

label span {
  font-weight: 500;
}

input {
  width: 100%;
  padding: 11px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-size: 1rem;
  color: var(--ink);
  background: #fff;
  outline: none;
  transition: border-color 0.15s;
}

input:focus {
  border-color: var(--accent);
}

.captcha-wrap {
  display: flex;
  gap: 10px;
  align-items: center;
}

.captcha-wrap input {
  flex: 1;
}

#captcha-img {
  height: 48px;
  width: 160px;
  border-radius: 8px;
  border: 1px solid var(--line);
  cursor: pointer;
  flex-shrink: 0;
}

button[type="submit"] {
  margin-top: 4px;
  padding: 12px 16px;
  border: none;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
}

button[type="submit"]:hover:not(:disabled) {
  background: var(--accent-hover);
}

button[type="submit"]:disabled {
  opacity: 0.65;
  cursor: not-allowed;
}

.error {
  margin: 16px 0 0;
  padding: 10px 12px;
  border-radius: 8px;
  background: #fef3f2;
  color: var(--err);
  font-size: 0.9rem;
}

.result {
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.result h2 {
  margin: 0 0 14px;
  font-size: 1.05rem;
}

.result dl {
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.result dl > div {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: baseline;
}

.result dt {
  margin: 0;
  color: var(--muted);
  font-size: 0.875rem;
}

.result dd {
  margin: 0;
  font-weight: 600;
  text-align: right;
}

.result dd.highlight {
  color: var(--accent);
  font-size: 1.15rem;
}

@media (max-width: 480px) {
  .page {
    padding-top: 32px;
  }

  .header h1 {
    font-size: 1.5rem;
  }
}