:root {
  --primary-gradient-start: #67C8E3; /* 新的渐变起始色（左上角偏青） */
  --primary-gradient-mid: #3AADE5; /* 新的中间色 */
  --primary-gradient-end: #1496EC; /* 新的渐变结束色（右下角偏蓝） */
  --primary-color: #1496EC; /* 新的主色调 */
  --primary-dark: #0d72a8;
  --secondary-color: #67C8E3; /* 新的次色调 */
  --success-color: #44d62c;
  --warning-color: #ffdc7d;
  --light-bg: #fafafa; /* Instagram Background */
  --dark-text: #262626; /* Instagram Text */
  --light-text: #8e8e8e; /* Instagram Secondary Text */
  --border-color: #dbdbdb; /* Instagram Border */
  --story-border: linear-gradient(45deg, #fcaf45, #fd1d1d, #833ab4);
  --border-radius: 8px;
  --box-shadow: 0 2px 12px rgba(0, 0, 0, 0.1);
}

body {
  font-family: 'Montserrat', 'Segoe UI', 'Helvetica Neue', sans-serif;
  background-color: var(--light-bg);
  color: var(--dark-text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  margin: 0;
  padding: 0;
}

.main-container {
  flex: 1;
  display: flex;
  flex-direction: row;
}

/* 左侧广告区域样式 */
.promo-container {
  flex: 1;
  background-color: var(--light-bg);
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 40px;
  color: var(--dark-text);
  position: relative;
  overflow: hidden;
}

.promo-container::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('https://images.unsplash.com/photo-1522071820081-009f0129c71c?crop=entropy&cs=tinysrgb&fit=max&fm=jpg&ixid=MnwxfDB8MXxhbGx8fHx8fHx8fHwxNjE5NTUyNjY0&ixlib=rb-1.2.1&q=80&w=1080') center center;
  background-size: cover;
  opacity: 0.05;
  z-index: 0;
}

.promo-content {
  position: relative;
  z-index: 1;
  max-width: 600px;
  margin: 0 auto;
}

.promo-logo {
  font-size: 60px;
  font-weight: 700;
  margin-bottom: 30px;
  background: linear-gradient(135deg, var(--primary-gradient-start), var(--primary-gradient-end));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.promo-tagline {
  font-size: 36px;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 20px;
  color: var(--dark-text);
}

.promo-description {
  font-size: 18px;
  margin-bottom: 40px;
  color: var(--light-text);
  max-width: 500px;
  line-height: 1.6;
}

.feature-list {
  display: flex;
  flex-wrap: wrap;
  margin-bottom: 30px;
}

.feature-item {
  display: flex;
  align-items: center;
  width: 100%;
  margin-bottom: 20px;
}

.feature-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--primary-gradient-start), var(--primary-gradient-end));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-right: 15px;
  font-size: 18px;
  color: white;
}

.feature-text {
  font-size: 16px;
  font-weight: 500;
  color: var(--dark-text);
}

.decorative-circle {
  position: absolute;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary-gradient-start), var(--primary-gradient-end));
  opacity: 0.1;
  z-index: 0;
}

.circle-1 {
  width: 300px;
  height: 300px;
  bottom: -150px;
  left: -150px;
}

.circle-2 {
  width: 200px;
  height: 200px;
  top: -100px;
  right: -50px;
}

/* 右侧登录区域样式 */
.login-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 40px;
  background-color: white;
}

.login-content {
  width: 100%;
  max-width: 420px;
}

.logo-container {
  text-align: center;
  margin-bottom: 40px;
}

.app-logo {
  font-size: 40px;
  font-weight: 600;
  background: linear-gradient(135deg, var(--primary-gradient-start), var(--primary-gradient-end));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin: 0 auto;
  display: inline-block;
}

.app-title {
  font-size: 16px;
  color: var(--light-text);
  margin-top: 5px;
}

.login-card {
  background: white;
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
  padding: 30px;
  border: 1px solid var(--border-color);
}

.login-title {
  font-weight: 600;
  font-size: 24px;
  margin-bottom: 25px;
  color: var(--dark-text);
  text-align: center;
}

.form-group label {
  font-weight: 500;
  font-size: 14px;
  margin-bottom: 8px;
  color: var(--dark-text);
}

.form-control {
  border-radius: var(--border-radius);
  padding: 12px 15px;
  height: auto;
  border: 1px solid var(--border-color);
  transition: all 0.2s ease;
  font-size: 14px;
}

.form-control:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 0.2rem rgba(64, 93, 230, 0.25);
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-gradient-start), var(--primary-gradient-end));
  border: none;
  border-radius: 4px;
  padding: 12px;
  font-weight: 500;
  font-size: 16px;
  width: 100%;
  margin-top: 10px;
  transition: all 0.3s ease;
  color: white;
}

.btn-primary:hover, .btn-primary:focus {
  background: linear-gradient(135deg, var(--primary-gradient-end), var(--primary-gradient-start));
  box-shadow: 0 2px 10px rgba(20, 150, 236, 0.3);
  color: white;
}

.divider {
  display: flex;
  align-items: center;
  text-align: center;
  margin: 25px 0;
  color: var(--light-text);
}

.divider::before, .divider::after {
  content: '';
  flex: 1;
  border-bottom: 1px solid var(--border-color);
}

.divider::before {
  margin-right: 12px;
}

.divider::after {
  margin-left: 12px;
}

.social-login {
  display: flex;
  gap: 15px;
  margin-bottom: 20px;
}

.social-btn {
  flex: 1;
  padding: 10px 0;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  color: var(--dark-text);
  text-decoration: none;
  transition: all 0.2s ease;
}

.social-btn:hover {
  background-color: var(--light-bg);
  text-decoration: none;
  color: var(--dark-text);
}

.social-btn i {
  margin-right: 8px;
  font-size: 16px;
}

.additional-links {
  display: flex;
  justify-content: space-between;
  margin-top: 20px;
  font-size: 13px;
}

.additional-links a {
  color: var(--primary-color);
  text-decoration: none;
}

.additional-links a:hover {
  text-decoration: underline;
}

.signup-cta {
  text-align: center;
  margin-top: 20px;
  padding: 15px;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  background: white;
}

.signup-cta p {
  margin-bottom: 0;
  font-size: 14px;
}

.signup-cta a {
  color: var(--primary-color);
  font-weight: 500;
  text-decoration: none;
}

.signup-cta a:hover {
  text-decoration: underline;
}

.footer {
  text-align: center;
  padding: 20px 0;
  font-size: 13px;
  color: var(--light-text);
  background: white;
}

.footer a {
  color: var(--light-text);
  text-decoration: none;
  margin: 0 10px;
}

.footer a:hover {
  color: var(--dark-text);
}

@media (max-width: 991px) {
  .main-container {
    flex-direction: column;
  }
  
  .promo-container {
    padding: 30px;
  }
  
  .promo-tagline {
    font-size: 28px;
  }
  
  .promo-description {
    font-size: 16px;
  }
}

@media (max-width: 767px) {
  .login-content {
    padding: 0 15px;
  }
  
  .login-card {
    padding: 20px;
  }
  
  .social-login {
    flex-direction: column;
    gap: 10px;
  }
  
  .promo-logo {
    font-size: 40px;
  }
  
  .promo-tagline {
    font-size: 24px;
  }
  
  .promo-description {
    font-size: 15px;
  }
}