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

:root {
  --primary: #3b82f6;
  --primary-dark: #2563eb;
  --text: #1f2937;
  --text-sub: #6b7280;
  --border: #d1d5db;
  --error: #dc2626;
  --bg-gradient: linear-gradient(160deg, #eff6ff 0%, #f0fdf4 100%);
}

html, body {
  height: 100%;
}

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  background: var(--bg-gradient);
  color: var(--text);
}

/* ============ 页面布局：卡片居中 ============ */
.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.login-card {
  width: 100%;
  max-width: 380px;
  background: #ffffff;
  border-radius: 16px;
  box-shadow: 0 10px 40px rgba(59, 130, 246, 0.12);
  padding: 40px 32px 28px;
  text-align: center;
}

.logo {
  font-size: 44px;
  line-height: 1;
}

.login-card h1 {
  margin-top: 12px;
  font-size: 22px;
  letter-spacing: 2px;
}

.slogan {
  margin-top: 6px;
  font-size: 13px;
  color: var(--text-sub);
}

/* ============ 表单 ============ */
#loginForm {
  margin-top: 28px;
  text-align: left;
}

.field {
  margin-bottom: 16px;
}

.field label {
  display: block;
  font-size: 13px;
  color: var(--text-sub);
  margin-bottom: 6px;
}

.field input {
  width: 100%;
  height: 44px;
  padding: 0 14px;
  font-size: 15px;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.field input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.field input.is-invalid {
  border-color: var(--error);
}

.password-field {
  position: relative;
}

.password-field input {
  padding-right: 44px;
}

.toggle-pwd {
  position: absolute;
  right: 6px;
  top: 50%;
  transform: translateY(-50%);
  width: 34px;
  height: 34px;
  border: none;
  background: transparent;
  border-radius: 8px;
  cursor: pointer;
  font-size: 16px;
}

.toggle-pwd:hover {
  background: #f3f4f6;
}

.error-msg {
  min-height: 16px;
  margin-top: 4px;
  font-size: 12px;
  color: var(--error);
}

/* ============ 按钮 ============ */
.btn-primary {
  width: 100%;
  height: 46px;
  margin-top: 4px;
  border: none;
  border-radius: 10px;
  background: var(--primary);
  color: #ffffff;
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 4px;
  cursor: pointer;
  transition: background 0.2s;
}

.btn-primary:hover {
  background: var(--primary-dark);
}

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

.footer-note {
  margin-top: 20px;
  font-size: 12px;
  color: var(--text-sub);
}

/* ============ 移动端适配 ============ */
@media (max-width: 420px) {
  .login-card {
    padding: 32px 22px 24px;
    border-radius: 14px;
  }
}