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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  font-size: 14px; /* 默认使用更紧凑的 14px */
  line-height: 1.5;
  color: #333;
}

/* ---------- 登录页专用样式 ---------- */
body.login-layout {
  background: linear-gradient(160deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
  min-height: 100vh;
  padding: 20px;
}

.page {
  max-width: 420px;
  margin: 0 auto;
  padding: 24px;
}

/* 电脑端：登录卡收窄、垂直居中 */
@media (min-width: 769px) {
  body.login-layout {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px;
  }

  .page {
    max-width: 360px;
    width: 100%;
    padding: 0;
  }

  .card {
    padding: 28px 32px;
  }
}

.card {
  background: rgba(255, 255, 255, 0.95);
  border-radius: 12px;
  padding: 24px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

/* 移动端响应式 */
@media (max-width: 768px) {
  body {
    padding: 12px;
  }

  .page {
    padding: 16px;
  }

  .card {
    padding: 20px;
    border-radius: 12px;
  }

  h1 {
    font-size: 20px;
    margin-bottom: 20px;
  }

  .form-group input {
    height: 40px;
    font-size: 16px; /* 防止 iOS 自动缩放 */
  }

  .btn {
    height: 40px;
    line-height: 40px;
  }
}

@media (max-width: 480px) {
  body {
    padding: 8px;
  }

  .page {
    padding: 12px;
  }

  .card {
    padding: 18px;
  }

  h1 {
    font-size: 18px;
  }
}

h1 {
  font-size: 20px;
  font-weight: 600;
  color: #1a1a2e;
  margin-bottom: 20px;
  text-align: center;
}

.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: #555;
  margin-bottom: 6px;
}

.form-group input {
  width: 100%;
  height: 40px;
  padding: 0 12px;
  font-size: 14px;
  border: 1px solid #ddd;
  border-radius: 8px;
  background: #fff;
  transition: border-color 0.2s;
}

.form-group input:focus {
  outline: none;
  border-color: #0f3460;
  box-shadow: 0 0 0 3px rgba(15, 52, 96, 0.15);
}

.form-group input::placeholder {
  color: #999;
}

.btn {
  display: block;
  width: 100%;
  height: 40px;
  line-height: 40px;
  font-size: 15px;
  font-weight: 600;
  text-align: center;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: opacity 0.2s, transform 0.1s;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: linear-gradient(135deg, #0f3460 0%, #16213e 100%);
  color: #fff;
  margin-top: 8px;
}

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.btn-primary:not(:disabled):hover {
  opacity: 0.95;
}

.link {
  display: block;
  text-align: center;
  margin-top: 20px;
  font-size: 14px;
  color: #0f3460;
  text-decoration: none;
}

.link:hover {
  text-decoration: underline;
}

.alert {
  padding: 12px 14px;
  border-radius: 8px;
  font-size: 14px;
  margin-bottom: 16px;
}

.alert-error {
  background: #fee;
  color: #c00;
  border: 1px solid #fcc;
}

.alert-success {
  background: #efe;
  color: #060;
  border: 1px solid #cfc;
}

.alert-info {
  background: #e8f4fd;
  color: #0f3460;
  border: 1px solid #b8daff;
}

.hidden {
  display: none !important;
}

/* 二次确认弹层 */
.overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 20px;
}

.modal {
  background: #fff;
  border-radius: 16px;
  padding: 24px;
  max-width: 360px;
  width: 100%;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.25);
}

/* 移动端弹层优化 */
@media (max-width: 768px) {
  .overlay {
    padding: 16px;
  }

  .modal {
    padding: 20px;
    max-width: 100%;
    border-radius: 12px;
  }

  .modal h3 {
    font-size: 16px;
  }

  .modal-actions {
    flex-direction: column;
  }

  .modal-actions .btn {
    width: 100%;
  }
}

.modal h3 {
  font-size: 18px;
  margin-bottom: 16px;
  color: #1a1a2e;
}

.modal .confirm-info {
  font-size: 14px;
  color: #555;
  margin-bottom: 20px;
  line-height: 1.6;
}

.modal .confirm-info strong {
  color: #333;
}

.modal-actions {
  display: flex;
  gap: 12px;
}

.modal-actions .btn {
  flex: 1;
}

.btn-secondary {
  background: #f0f0f0;
  color: #333;
}

.btn-secondary:hover {
  background: #e5e5e5;
}

.loading {
  opacity: 0.7;
  pointer-events: none;
}

.mode-tip {
  text-align: center;
  font-size: 12px;
  color: rgba(255,255,255,0.7);
  margin-top: 16px;
}