* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  min-height: 100vh;
}

.login-page {
  display: flex;
  min-height: 100vh;
}

.login-brand {
  flex: 1;
  background: linear-gradient(135deg, #1e3a5f 0%, #0f2744 50%, #162447 100%);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 3rem;
}

.brand-inner {
  max-width: 400px;
}

.brand-logo {
  width: 56px;
  height: 56px;
  background: rgba(255, 255, 255, 0.15);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.25rem;
  margin-bottom: 1.5rem;
}

.brand-inner h1 {
  font-size: 1.75rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.version-badge {
  display: inline-block;
  margin: 0.5rem 0 1rem;
  padding: 4px 12px;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: 4px;
  font-size: 0.8rem;
  letter-spacing: 0.02em;
}

.brand-inner > p:not(.version-badge) {
  opacity: 0.85;
  font-size: 0.95rem;
  margin-bottom: 2rem;
}

.brand-features {
  list-style: none;
}

.brand-features li {
  padding: 0.5rem 0;
  padding-left: 1.25rem;
  position: relative;
  font-size: 0.9rem;
  opacity: 0.9;
}

.brand-features li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: #60a5fa;
}

.login-form-panel {
  width: 480px;
  max-width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #f0f2f5;
  padding: 2rem;
}

.form-wrap {
  width: 100%;
  max-width: 380px;
  background: #fff;
  border-radius: 8px;
  padding: 2.5rem 2rem;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
}

.form-wrap h2 {
  font-size: 1.35rem;
  color: #1f2937;
  margin-bottom: 0.35rem;
}

.form-sub {
  font-size: 0.875rem;
  color: #6b7280;
  margin-bottom: 1.75rem;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-bottom: 1.25rem;
}

.field span {
  font-size: 0.8rem;
  color: #374151;
  font-weight: 500;
}

.field input {
  height: 40px;
  padding: 0 12px;
  border: 1px solid #d1d5db;
  border-radius: 6px;
  font-size: 0.95rem;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.field input:focus {
  outline: none;
  border-color: #2563eb;
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.captcha-row {
  display: flex;
  gap: 10px;
}

.captcha-row input {
  flex: 1;
}

.captcha-img {
  width: 120px;
  height: 40px;
  border: 1px solid #d1d5db;
  border-radius: 6px;
  cursor: pointer;
  flex-shrink: 0;
  background: #f9fafb;
}

.login-error {
  color: #dc2626;
  font-size: 0.85rem;
  margin-bottom: 1rem;
}

.login-error.hidden {
  display: none;
}

.btn-login {
  width: 100%;
  height: 42px;
  border: none;
  border-radius: 6px;
  background: #2563eb;
  color: #fff;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
}

.btn-login:hover {
  background: #1d4ed8;
}

.btn-login:disabled {
  background: #93c5fd;
  cursor: not-allowed;
}

.login-foot {
  margin-top: 1.5rem;
  font-size: 0.75rem;
  color: #9ca3af;
  text-align: center;
  line-height: 1.5;
}

.version-foot {
  color: #6b7280;
  font-weight: 500;
}

@media (max-width: 768px) {
  .login-page {
    flex-direction: column;
  }
  .login-brand {
    padding: 2rem;
  }
  .login-form-panel {
    width: 100%;
  }
}