/* 统一认证系统 - 样式表 */
/* 设计原则：不使用渐变色，使用纯色 */

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

:root {
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary-color: #2196F3;
    --danger-color: #f44336;
    --warning-color: #ff9800;
    --success-color: #4CAF50;
    --text-primary: #1a1a1a;
    --text-secondary: #666;
    --bg-light: #f5f5f5;
    --bg-white: #ffffff;
    --border-color: #e0e0e0;
    --shadow: 0 2px 8px rgba(0,0,0,0.08);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-light);
    color: var(--text-primary);
    line-height: 1.6;
}

/* 容器 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* 头部 */
.header {
    background-color: var(--bg-white);
    border-bottom: 1px solid var(--border-color);
    padding: 16px 0;
    margin-bottom: 0;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo h1 {
    color: var(--text-primary);
    font-size: 20px;
    font-weight: 600;
    margin: 0;
}

.nav {
    display: flex;
    gap: 8px;
    align-items: center;
}

.nav a {
    color: var(--text-secondary);
    text-decoration: none;
    padding: 8px 16px;
    border-radius: 6px;
    transition: all 0.2s;
    font-size: 14px;
    font-weight: 500;
}

.nav a:hover {
    background-color: #f0f9ff;
    color: var(--primary-color);
}

/* 卡片 */
.card {
    background-color: var(--bg-white);
    border-radius: 8px;
    box-shadow: var(--shadow);
    padding: 30px;
    margin-bottom: 20px;
}

.card-header {
    text-align: center;
    margin-bottom: 30px;
}

.card-header h2 {
    color: var(--text-primary);
    font-size: 28px;
    font-weight: 600;
    margin-bottom: 8px;
}

.card-header p {
    color: var(--text-secondary);
    font-size: 14px;
}

/* 表单 */
.form-group {
    margin-bottom: 20px;
}

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

.form-input {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    transition: all 0.2s;
    box-sizing: border-box;
}

.form-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

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

/* 按钮 */
.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

.btn:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}

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

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

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

.btn-secondary {
    background-color: var(--secondary-color);
    color: white;
}

.btn-secondary:hover {
    background-color: #1976D2;
}

.btn-danger {
    background-color: var(--danger-color);
    color: white;
}

.btn-danger:hover {
    background-color: #d32f2f;
}

.btn-block {
    width: 100%;
}

.btn-link {
    background-color: transparent;
    color: var(--primary-color);
    padding: 0;
    text-decoration: underline;
}

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

/* 提示信息 */
.alert {
    padding: 12px 16px;
    border-radius: 4px;
    margin-bottom: 20px;
    font-size: 14px;
}

.alert-success {
    background-color: #e8f5e9;
    color: #2e7d32;
    border: 1px solid #4CAF50;
}

.alert-error {
    background-color: #ffebee;
    color: #c62828;
    border: 1px solid #f44336;
}

.alert-warning {
    background-color: #fff3e0;
    color: #e65100;
    border: 1px solid #ff9800;
}

.alert-info {
    background-color: #e3f2fd;
    color: #1565c0;
    border: 1px solid #2196F3;
}

/* 链接 */
.text-link {
    color: var(--primary-color);
    text-decoration: none;
}

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

.text-center {
    text-align: center;
}

.text-muted {
    color: var(--text-secondary);
    font-size: 14px;
}

/* 分隔线 */
.divider {
    margin: 20px 0;
    border: none;
    border-top: 1px solid var(--border-color);
}

/* 认证卡片（登录/注册） */
.auth-card {
    max-width: 450px;
    margin: 50px auto;
}

/* OAuth授权卡片 */
.oauth-card {
    max-width: 550px;
    margin: 50px auto;
}

.app-info {
    background-color: var(--bg-light);
    padding: 20px;
    border-radius: 4px;
    margin-bottom: 20px;
}

.app-info h3 {
    color: var(--text-primary);
    margin-bottom: 10px;
}

.app-info p {
    color: var(--text-secondary);
    font-size: 14px;
}

.permission-list {
    list-style: none;
    padding: 0;
}

.permission-list li {
    padding: 10px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 10px;
}

.permission-list li:last-child {
    border-bottom: none;
}

.permission-icon {
    color: var(--primary-color);
    font-size: 18px;
}

/* 按钮组 */
.btn-group {
    display: flex;
    gap: 10px;
}

.btn-group .btn {
    flex: 1;
}

/* 加载动画 */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid var(--bg-light);
    border-radius: 50%;
    border-top-color: var(--primary-color);
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* 页脚 */
.footer {
    text-align: center;
    padding: 24px 20px;
    color: var(--text-secondary);
    font-size: 13px;
    margin-top: 60px;
    border-top: 1px solid var(--border-color);
    background-color: var(--bg-white);
}

.footer p {
    margin: 0;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 15px;
    }
    
    .nav {
        flex-direction: column;
        gap: 10px;
    }
    
    .auth-card,
    .oauth-card {
        margin: 20px;
    }
    
    .btn-group {
        flex-direction: column;
    }
}

/* 隐藏元素 */
.hidden {
    display: none;
}

/* 禁用状态 */
.disabled {
    opacity: 0.6;
    cursor: not-allowed;
    pointer-events: none;
}