/* 全局重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

/* 登录容器 */
.login-container {
    width: 100%;
    max-width: 400px;
    margin: 0 auto;
}

.login-box {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 24px;
    padding: 32px 24px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.logo {
    text-align: center;
    margin-bottom: 32px;
}

.logo span {
    font-size: 48px;
    display: block;
    margin-bottom: 8px;
}

.logo h1 {
    font-size: 24px;
    color: #333;
    font-weight: 600;
}

/* 输入框 */
.input-group {
    margin-bottom: 20px;
}

.input-group label {
    display: block;
    font-size: 14px;
    color: #555;
    margin-bottom: 6px;
    font-weight: 500;
}

.input-group input {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid #e8ecf1;
    border-radius: 12px;
    font-size: 16px;
    transition: border-color 0.3s;
    background: #f8f9fa;
    outline: none;
}

.input-group input:focus {
    border-color: #667eea;
    background: #fff;
}

/* 消息提示 */
.message {
    padding: 10px 14px;
    border-radius: 10px;
    margin-bottom: 20px;
    font-size: 14px;
    display: none;
}

.message.error {
    display: block;
    background: #fee;
    color: #c0392b;
    border: 1px solid #f5c6cb;
}

.message.success {
    display: block;
    background: #e8f5e9;
    color: #2e7d32;
    border: 1px solid #c8e6c9;
}

/* 登录按钮 */
.login-btn {
    width: 100%;
    padding: 16px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    border: none;
    border-radius: 12px;
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

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

.login-btn:disabled {
    opacity: 0.7;
    transform: scale(0.98);
}

/* 演示提示 */
.demo-hint {
    margin-top: 20px;
    padding: 14px;
    background: #f0f4ff;
    border-radius: 10px;
    border: 1px dashed #667eea;
}

.demo-hint p {
    font-size: 13px;
    color: #555;
    margin: 4px 0;
    text-align: center;
}

/* Dashboard 页面样式 */
.container {
    width: 100%;
    max-width: 420px;
    margin: 0 auto;
    padding: 16px;
}

.dashboard-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(255,255,255,0.95);
    padding: 16px 20px;
    border-radius: 16px;
    margin-bottom: 20px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}

.dashboard-header h2 {
    font-size: 18px;
    color: #333;
}

.logout-btn {
    padding: 8px 18px;
    background: #ff6b6b;
    color: #fff;
    border-radius: 20px;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
}

.card {
    background: rgba(255,255,255,0.95);
    padding: 20px;
    border-radius: 16px;
    margin-bottom: 16px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}

.card h3 {
    color: #333;
    margin-bottom: 12px;
    font-size: 17px;
}

.card p {
    color: #555;
    font-size: 15px;
    line-height: 1.8;
}

/* 移动端优化 */
@media (max-width: 480px) {
    .login-box {
        padding: 24px 16px;
        border-radius: 20px;
    }
    
    .logo span {
        font-size: 40px;
    }
    
    .input-group input {
        font-size: 15px;
        padding: 12px 14px;
    }
    
    .login-btn {
        font-size: 17px;
        padding: 14px;
    }
}