/**
 * 登录页面样式
 */

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 
                 'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
}

/* 登录容器 */
.login-container {
    position: relative;
    z-index: 10;
    width: 100%;
    max-width: 450px;
    padding: 20px;
}

/* 登录卡片 */
.login-card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    padding: 48px 40px;
    animation: fadeInUp 0.6s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 登录头部 */
.login-header {
    text-align: center;
    margin-bottom: 40px;
}

.login-title {
    font-size: 32px;
    font-weight: 700;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
}

.login-subtitle {
    font-size: 14px;
    color: #666;
    font-weight: 400;
}

/* 登录内容 */
.login-content {
    margin-bottom: 32px;
}

.login-content h2 {
    font-size: 24px;
    font-weight: 600;
    color: #333;
    margin-bottom: 12px;
    text-align: center;
}

.login-desc {
    font-size: 14px;
    color: #666;
    text-align: center;
    margin-bottom: 32px;
    line-height: 1.6;
}

/* 飞书登录按钮 */
.feishu-login-btn {
    width: 100%;
    height: 54px;
    background: linear-gradient(135deg, #00D6B9 0%, #00B8A9 100%);
    border: none;
    border-radius: 12px;
    color: white;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 214, 185, 0.4);
}

.feishu-login-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 214, 185, 0.5);
}

.feishu-login-btn:active {
    transform: translateY(0);
}

.feishu-login-btn:disabled {
    cursor: not-allowed;
    opacity: 0.6;
}

.feishu-icon {
    width: 24px;
    height: 24px;
}

/* 加载状态 */
.loading {
    text-align: center;
    padding: 24px;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.loading-spinner {
    width: 40px;
    height: 40px;
    margin: 0 auto 16px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

.loading p {
    font-size: 14px;
    color: #666;
}

/* 错误提示 */
.error-message {
    margin-top: 16px;
    padding: 12px 16px;
    background: #fee;
    border: 1px solid #fcc;
    border-radius: 8px;
    color: #c33;
    font-size: 14px;
    text-align: center;
    animation: shake 0.5s ease;
}

@keyframes shake {
    0%, 100% {
        transform: translateX(0);
    }
    10%, 30%, 50%, 70%, 90% {
        transform: translateX(-5px);
    }
    20%, 40%, 60%, 80% {
        transform: translateX(5px);
    }
}

/* 登录底部 */
.login-footer {
    text-align: center;
    font-size: 12px;
    color: #999;
    line-height: 1.8;
}

.copyright {
    margin-top: 8px;
}

/* 背景装饰 */
.bg-decoration {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    z-index: 1;
    pointer-events: none;
}

.circle {
    position: absolute;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    animation: float 20s infinite ease-in-out;
}

.circle-1 {
    width: 300px;
    height: 300px;
    top: -150px;
    left: -150px;
    animation-delay: 0s;
}

.circle-2 {
    width: 200px;
    height: 200px;
    bottom: -100px;
    right: -100px;
    animation-delay: 2s;
}

.circle-3 {
    width: 150px;
    height: 150px;
    top: 50%;
    left: 80%;
    animation-delay: 4s;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0) translateX(0);
    }
    33% {
        transform: translateY(-30px) translateX(30px);
    }
    66% {
        transform: translateY(30px) translateX(-30px);
    }
}

/* 响应式设计 */
@media (max-width: 768px) {
    .login-card {
        padding: 32px 24px;
    }
    
    .login-title {
        font-size: 28px;
    }
    
    .login-content h2 {
        font-size: 20px;
    }
    
    .feishu-login-btn {
        height: 48px;
        font-size: 15px;
    }
}

@media (max-width: 480px) {
    .login-container {
        padding: 16px;
    }
    
    .login-card {
        padding: 24px 20px;
    }
    
    .login-header {
        margin-bottom: 32px;
    }
    
    .login-title {
        font-size: 24px;
    }
    
    .login-subtitle {
        font-size: 13px;
    }
}