/* WheatSpace 社交登录样式
 * 品牌按钮样式规范
 */

/* =============================================
 * 社交登录按钮基础样式
 * ============================================= */

.social-login-container {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin: 20px 0;
}

.social-login-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    width: 100%;
    padding: 14px 20px;
    border-radius: 12px;
    border: 2px solid transparent;
    font-weight: 600;
    font-size: 15px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    text-align: center;
    position: relative;
    overflow: hidden;
    user-select: none;
}

.social-login-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
}

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

.social-login-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
}

.social-login-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.7s;
}

.social-login-btn:hover::before {
    left: 100%;
}

.social-login-btn-icon {
    font-size: 18px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.social-login-btn-text {
    flex-grow: 1;
    text-align: center;
    letter-spacing: 0.3px;
}

/* =============================================
 * Google 登录按钮样式
 * ============================================= */

.btn-google {
    background: linear-gradient(135deg, #4285F4 0%, #4285F4 25%, #34A853 25%, #34A853 50%, #FBBC05 50%, #FBBC05 75%, #EA4335 75%, #EA4335 100%);
    background-size: 400% 400%;
    color: white;
    border-color: rgba(255, 255, 255, 0.2);
    box-shadow: 0 6px 20px rgba(66, 133, 244, 0.3);
    animation: google-gradient 8s ease infinite;
}

.btn-google:hover {
    background-position: 100% 50%;
    box-shadow: 0 12px 30px rgba(66, 133, 244, 0.4);
}

.btn-google .social-login-btn-icon {
    background: white;
    border-radius: 50%;
    width: 24px;
    height: 24px;
    padding: 4px;
}

.btn-google .social-login-btn-icon svg {
    width: 16px;
    height: 16px;
}

@keyframes google-gradient {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* =============================================
 * GitHub 登录按钮样式
 * ============================================= */

.btn-github {
    background: linear-gradient(135deg, #24292e 0%, #24292e 50%, #2b3137 50%, #2b3137 100%);
    color: white;
    border-color: rgba(255, 255, 255, 0.15);
    box-shadow: 0 6px 20px rgba(36, 41, 46, 0.3);
    position: relative;
}

.btn-github::after {
    content: '';
    position: absolute;
    top: 1px;
    left: 1px;
    right: 1px;
    bottom: 1px;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, transparent 100%);
    border-radius: 10px;
    pointer-events: none;
}

.btn-github:hover {
    background: linear-gradient(135deg, #2b3137 0%, #24292e 100%);
    box-shadow: 0 12px 30px rgba(36, 41, 46, 0.4);
}

.btn-github .social-login-btn-icon {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    width: 24px;
    height: 24px;
    padding: 4px;
    backdrop-filter: blur(4px);
}

/* =============================================
 * 分离线样式
 * ============================================= */

.login-separator {
    display: flex;
    align-items: center;
    margin: 24px 0;
    color: #9ca3af;
    font-size: 13px;
}

.login-separator::before,
.login-separator::after {
    content: '';
    flex: 1;
    height: 1px;
    background: linear-gradient(90deg, transparent, #e5e7eb, transparent);
}

.login-separator-text {
    padding: 0 12px;
    font-weight: 500;
    white-space: nowrap;
}

/* =============================================
 * 响应式调整
 * ============================================= */

@media (max-width: 640px) {
    .social-login-btn {
        padding: 12px 16px;
        font-size: 14px;
        border-radius: 10px;
    }
    
    .social-login-btn-icon {
        font-size: 16px;
        width: 22px;
        height: 22px;
    }
    
    .btn-google .social-login-btn-icon,
    .btn-github .social-login-btn-icon {
        width: 22px;
        height: 22px;
    }
}

@media (max-width: 480px) {
    .social-login-container {
        gap: 10px;
    }
    
    .social-login-btn {
        padding: 11px 14px;
    }
}

/* =============================================
 * 加载状态样式
 * ============================================= */

.social-login-btn-loading {
    position: relative;
    color: transparent !important;
}

.social-login-btn-loading::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    top: 50%;
    left: 50%;
    margin-left: -10px;
    margin-top: -10px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: social-login-spinner 0.8s linear infinite;
}

@keyframes social-login-spinner {
    to { transform: rotate(360deg); }
}

/* =============================================
 * 暗色模式支持
 * ============================================= */

@media (prefers-color-scheme: dark) {
    .login-separator {
        color: #4b5563;
    }
    
    .login-separator::before,
    .login-separator::after {
        background: linear-gradient(90deg, transparent, #374151, transparent);
    }
}

/* =============================================
 * 无障碍支持
 * ============================================= */

.social-login-btn:focus-visible {
    outline: 3px solid rgba(66, 133, 244, 0.5);
    outline-offset: 2px;
}

.social-login-btn:focus:not(:focus-visible) {
    outline: none;
}

/* =============================================
 * 工具类
 * ============================================= */

.social-login-full-width {
    width: 100%;
}

.social-login-auto-width {
    width: auto;
    min-width: 200px;
}

.social-login-btn-small {
    padding: 10px 16px;
    font-size: 14px;
    border-radius: 10px;
}

.social-login-btn-large {
    padding: 16px 24px;
    font-size: 16px;
    border-radius: 14px;
}

/* =============================================
 * 品牌颜色变量（CSS自定义属性）
 * ============================================= */

:root {
    /* Google品牌色 */
    --google-blue: #4285F4;
    --google-green: #34A853;
    --google-yellow: #FBBC05;
    --google-red: #EA4335;
    
    /* GitHub品牌色 */
    --github-dark: #24292e;
    --github-darker: #2b3137;
    
    /* WheatSpace品牌色 */
    --wheat-primary: #745B72;
    --wheat-secondary: #5C7995;
    --wheat-accent: #E6BCBC;
    --wheat-light: #F7F7F4;
    --wheat-dark: #111111;
}

/* 暗色模式变量 */
@media (prefers-color-scheme: dark) {
    :root {
        --wheat-light: #1a1a1a;
        --wheat-dark: #f8f9fa;
    }
}